Combine harvester

Abstract

A combine harvester is provided with a threshing device (4) that threshes cut grain in a threshing chamber (23), a cylinder (31) that rotates around a front-rear axis core (X) in the threshing chamber (23), and a circular arc-shaped screen (32) that is provided in a state of following the outer peripheral portion of the cylinder (31), and a top plate (30) that covers the upper portion of the threshing chamber (23) is supported so as to be detachable in the direction of the rotational axis core of the cylinder (31).

Description

Technical Field

[0001] This invention relates to combine harvesters. Background Technology

[0002] (1) In the past, there was a combine harvester equipped with a threshing device for threshing harvested rice stalks.

[0003] In conventional combine harvesters, such as those shown in Patent Document 1, the top plate covering the upper part of the threshing chamber is sometimes designed to swing upwards around the front and rear axles on one side of the lateral axis for inspection and cleaning of the threshing device. In the combine harvester described in Patent Document 1, a grain bin for storing the grains obtained from the threshing process is provided in a position above the threshing device.

[0004] (2) In the past, there was a type of combine harvester that had a threshing device for threshing cut rice stalks in a threshing chamber, and multiple dust valves that moved the threshed material from one side of the rotating shaft of the threshing cylinder to the other side were provided on the inner surface of the top plate covering the upper part of the threshing chamber.

[0005] In conventional combine harvesters, such as those shown in Patent Document 1, multiple dust valves are mounted in a fixed position on the inner surface of the top plate (hereinafter referred to as the first prior art). Furthermore, as shown in Patent Document 2, multiple dust valves are supported swayably on the inner surface of the top plate and configured to allow for adjustment of the conveying angle (hereinafter referred to as the second prior art).

[0006] Existing technical documents

[0007] Patent documents

[0008] Patent Document 1: Japanese Patent Application Publication No. 2013-183717 (JP2013-183717A)

[0009] Patent Document 2: Japanese Patent Application Publication No. 6-292443 (JPH06-292443A) Summary of the Invention

[0010] The technical problem that the invention aims to solve

[0011] (1) Background Technology (1) The technical problems corresponding to the following are as follows.

[0012] As with the conventional structures described above, in designs where the top plate swings upwards to open the threshing chamber outwards, a large space is required on the upper side for maintenance work such as inspection and cleaning of the threshing unit, allowing the top plate to swing upwards significantly. In particular, if a grain bin is located above the threshing unit, a mechanism for opening the grain bin to a large extent is needed, resulting in a more complex structure. Furthermore, to swing the top plate, workers must climb to a higher position, making the work difficult.

[0013] Therefore, it is desirable to avoid complicating the structure and to facilitate easy maintenance of the threshing chamber.

[0014] (2) Background Technology (2) The technical problems corresponding to the following are as follows.

[0015] In the aforementioned first prior art, multiple dust valves are in a fixed position, thus allowing the top plate to be shaped into an arc to conform to the rotational limitation of the outer end of the threshing cylinder. However, in this structure, the conveying angle for transferring the threshing material in the dust valves is constant. Therefore, if a large amount of crop is brought into the threshing device, there is a risk that the conveying capacity of the threshing cylinder along the rotation axis may be insufficient, leading to blockage of the material and the material being moved backward before being threshed. If a small amount of crop is brought in, there is a risk that the material may be moved too quickly and be moved backward before being threshed, resulting in reduced threshing performance.

[0016] In the aforementioned second prior art, the conveying angle of the dust valve is adjusted according to changes in the amount of crop fed into the threshing device, ensuring smooth transfer of the threshed material even when the amount of crop changes. However, in this structure, to change the conveying angle of the dust valve, the position where the dust valve is installed in the top plate must be a flat surface, which poses a risk that the transfer of the threshed material, which is carried out along with the rotation of the threshing cylinder, may not be smooth.

[0017] Therefore, it is desirable to be able to smoothly transfer the threshing material along with the rotation of the threshing cylinder, and to maintain appropriate threshing performance depending on the amount of crop brought into the threshing unit.

[0018] Means for solving technical problems

[0019] (1) The first solution to the technical problem (1) is as follows.

[0020] The combine harvester of the present invention is characterized by having a threshing device for threshing harvested rice stalks in a threshing chamber, wherein the threshing chamber has a threshing cylinder that rotates about a front and rear axis and an arc-shaped screen arranged along the outer periphery of the threshing cylinder, and a top plate covering the upper part of the threshing chamber is supported so that it can be disassembled and reassembled along the rotation axis direction of the threshing cylinder.

[0021] According to the present invention, during maintenance operations such as inspection and cleaning of the threshing chamber, the top plate covering the upper part of the threshing chamber can be disassembled and reassembled along the rotation axis of the threshing cylinder. With this structure, workers do not need to climb to a higher position as in cases where the top plate is swung upwards; work can be performed from a lower position on the lateral side of the machine. Furthermore, even if the grain bin is positioned above the threshing device, for example, there is no need to equip the grain bin with a special retraction structure to allow the top plate to open, simplifying the support structure.

[0022] Therefore, it is possible to perform maintenance work inside the threshing chamber without complicating the structure.

[0023] In this invention, preferably, the top plate is composed of a plurality of segmented top plates divided along the direction of the rotation axis.

[0024] According to this structure, the segmented top plate is smaller and lighter than the whole top plate, thus reducing the labor burden of disassembly and assembly operations.

[0025] In this invention, preferably, the threshing cylinder has an input part located at one end in the direction of the rotating shaft for inputting the cut rice stalks and a threshing part located at the other end in the direction of the rotating shaft for threshing the cut rice stalks. The part of the top plate corresponding to the threshing part can be detached and assembled along the direction of the rotating shaft, and the part of the top plate corresponding to the input part is set in a fixed position.

[0026] According to this structure, in the threshing section of the threshing cylinder, threshing teeth are provided on the outer periphery of the threshing cylinder, and threshing of the cut rice stalks is performed between the teeth and the screen. In this area, the space between the threshing cylinder and the top plate is relatively narrow to ensure efficient threshing. As a result, if threshing is repeated, there is a greater risk of wear on the top plate due to contact with the threshing section. In contrast, in the feeding section of the threshing cylinder, spiral blades are provided on the outer periphery of the threshing cylinder to feed the cut rice stalks that are being fed into the threshing inlet to the rearward side. In this area, the cut rice stalks are only moved by the spiral blades, etc., reducing the risk of wear on the top plate as seen in the threshing section.

[0027] Therefore, by simply disassembling and assembling the corresponding position of the threshing unit, maintenance operations such as repair and replacement of easily worn parts can be carried out efficiently.

[0028] In this invention, preferably, the threshing device has sidewalls separating the left and right sides, and upper sidewall frames extending along the direction of the rotation axis are provided at the upper ends of the left and right sidewalls. The top plate supports the upper sidewall frames on the left and right sides in a manner that allows it to move along the direction of the rotation axis.

[0029] According to this structure, the top plate is supported by the upper frame of the side walls on the left and right sides extending along the direction of the rotation axis, thus enabling the top plate to move along the direction of the rotation axis in a stable supported state.

[0030] In this invention, preferably, the support portion supporting the top plate in the upper frame of the left and right side walls is provided with an anti-fall guide having a longitudinal surface.

[0031] According to this structure, when moving the top plate, the anti-fall guide can be used to prevent it from shifting to the lateral side, and the top plate can move smoothly along the direction of the rotation axis while maintaining the same orientation.

[0032] In this invention, preferably, a rotating body is provided on either the top plate or the upper frame of the side wall, which contacts and rotates with the other of the top plate and the upper frame of the side wall.

[0033] According to this structure, a rotating body disposed on either side of the top plate and the upper frame of the side wall contacts and rotates relative to the other side of the top plate and the upper frame of the side wall, thereby enabling the top plate to move smoothly.

[0034] In this invention, preferably, a sliding facilitator is provided on either the top plate or the upper frame of the side wall to facilitate smooth sliding movement.

[0035] According to this structure, when the top plate and the upper frame of the side wall move relative to each other in a contact state along with the movement of the top plate, a sliding facilitator provided on either the top plate or the upper frame of the side wall ensures smooth sliding movement. As a result, the top plate can move smoothly.

[0036] In this invention, preferably, a grain bin for storing the grains threshed by the threshing device and an engine as a power source are provided above the threshing device. On the lateral sides of the threshing device, upper frames are provided, which are supported by the body frame and extend along the direction of the rotation axis. The grain bin and the engine are supported by the upper frames on the left and right sides.

[0037] According to this structure, a grain bin and an engine are located above the threshing unit. For example, even if the threshing unit is enlarged to increase threshing capacity, the increase in the overall lateral width of the machine body can be suppressed compared to the case where the grain bin and engine are located on the lateral side of the threshing unit. Moreover, the upper left and right frames, which are stably supported by the machine body frame, can effectively support the grain bin and engine located at a higher position above the threshing unit.

[0038] In addition, the second solution to technical problem (1) is as follows.

[0039] The combine harvester of the present invention is characterized by having a threshing device for threshing harvested rice stalks in a threshing chamber, the threshing chamber having a threshing cylinder that rotates about a front and rear axis and an arc-shaped screen arranged along the outer periphery of the threshing cylinder, and a top plate covering the upper part of the threshing chamber being supported so as to be detachable in the lateral direction.

[0040] According to the present invention, during maintenance operations such as inspection and cleaning of the threshing chamber, the top plate covering the upper part of the threshing chamber can be disassembled and reassembled laterally. With this structure, workers do not need to climb to a higher position as in cases where the top plate is swung upwards; work can be performed from a lower position on the lateral side of the machine. Furthermore, even if the grain bin is positioned above the threshing unit, there is no need to equip the grain bin with a special clearance structure to allow the top plate to open, thus simplifying the support structure.

[0041] Therefore, it is possible to perform maintenance work inside the threshing chamber without complicating the structure.

[0042] In this invention, preferably, the top plate is composed of a plurality of segmented top plates divided along the rotation axis of the threshing cylinder, the plurality of segmented top plates being detachable and detachable in the lateral direction, and a support frame extending from one lateral side of the threshing device to the other side is provided at the dividing boundary of the plurality of segmented top plates, the plurality of segmented top plates being supported by the support frame.

[0043] According to this structure, the segmented roof panels are smaller and lighter than the entire roof panel, thus reducing the labor burden of disassembly and assembly operations. Since the support frame supporting the multiple segmented roof panels extends laterally from one side to the other at the segmentation boundary, it does not obstruct the lateral disassembly and assembly of the segmented roof panels, and facilitates the installation and dismantling of the segmented roof panels and support frame.

[0044] In this invention, preferably, the plurality of segmented top plates are each composed of a plurality of top plate components segmented circumferentially along the threshing cylinder, the top plate component located on one side of the lateral direction is supported on the support frame in a manner that allows it to be detached from the lateral direction, and the top plate component located on the other side of the lateral direction is supported by a guide rail portion provided on the support frame in a manner that allows it to be inserted and removed laterally.

[0045] According to this structure, by further dividing the top plate circumferentially, further weight reduction can be achieved, reducing the labor burden of disassembly and assembly operations. The top plate component located on one side of the lateral axis can be disassembled and assembled exactly as is, as it is positioned close to the operator's position on the outer side of the machine body. The top plate component located on the other side of the lateral axis, or in other words, the inner side, is supported by guide rails and can be inserted and removed laterally, allowing the operator on the outer side of the machine body to reach and remove it. After insertion and installation, it can be stably supported by the support frame via the guide rails.

[0046] In this invention, preferably, a grain bin for storing grains threshed by the threshing device and an engine as a power source are provided above the threshing device, and upper frames extending across the upper parts of the plurality of support frames and along the direction of the rotation axis are provided on the lateral sides of the threshing device, and the grain bin and the engine are supported by the left and right upper frames.

[0047] According to this structure, a grain bin and an engine are located above the threshing unit. For example, even if the threshing unit is enlarged to increase threshing capacity, the increase in the overall lateral width of the machine body can be suppressed compared to the case where the grain bin and engine are located on the lateral side of the threshing unit. Moreover, the left and right upper frames are stably supported by multiple support frames provided for dividing the top plate, and these left and right upper frames can provide good support for the grain bin and engine located at a higher position above the threshing unit.

[0048] In this invention, preferably, the screen is composed of a plurality of segmented screens divided along the rotation axis of the threshing cylinder, and the sidewall of the threshing device is composed of a plurality of segmented walls divided along the rotation axis. The segmented screens and the segmented walls are respectively supported so as to be detachable and reassembled in the lateral direction.

[0049] According to this structure, since the screen and sidewalls are divided, not only the top plate, but also the screen and sidewalls can be made smaller and lighter, reducing the labor burden of disassembly and assembly operations.

[0050] In this invention, preferably, the top plate is composed of a plurality of segmented top plates divided along the direction of the rotation axis, the segmented screen and the segmented wall are divided at the same position as the top plate along the direction of the rotation axis, and can be disassembled and assembled in the same direction as the top plate.

[0051] According to this structure, since the dividing top plate, dividing screen, and dividing wall are divided at the same location, their assembly and disassembly can be carried out efficiently and without cumbersome procedures. As a result, maintenance work inside the threshing chamber can be further facilitated.

[0052] In this invention, preferably, in the threshing chamber, the inner surface of the top plate is provided with a plurality of dust feeding valves spaced apart along the rotation axis of the threshing cylinder, which move the threshed material from one side of the rotation axis of the threshing cylinder to the other side. The plurality of dust feeding valves each have a fixed dust feeding valve portion and a movable dust feeding valve portion. The fixed dust feeding valve portion is installed on the top plate in a fixed position, and the movable dust feeding valve portion is adjacent to the fixed dust feeding valve portion in the circumferential direction and can be adjusted by swinging to change the conveying angle.

[0053] According to this structure, the fixed dust feed valve portion of the dust feed valve is mounted on the top plate in a fixed position, so the shape of the top plate is not restricted. Therefore, at the location where the fixed dust feed valve portion is mounted, the shape of the top plate can be configured to smoothly transfer the threshed material as the threshing cylinder rotates. Furthermore, by changing the conveying angle of the movable dust feed valve portion adjacent to the fixed dust feed valve portion in the circumferential direction, the conveying capacity of the threshing cylinder along the rotation axis can be changed.

[0054] As a result, the fixed dust valve section allows for smooth transfer of the threshing material along with the rotation of the threshing cylinder, while the movable dust valve section allows for adjustment of the conveying angle of the dust valve according to changes in the amount of crop fed into the threshing unit. Thus, even changes in the amount of crop can easily eliminate the disadvantage of reduced threshing performance.

[0055] (2) The solutions to technical problem (2) are as follows.

[0056] The combine harvester of the present invention is characterized by having a threshing device for threshing harvested rice stalks in a threshing chamber, the threshing chamber comprising: a threshing cylinder that rotates about a front and rear axis; an arc-shaped screen arranged along the outer periphery of the threshing cylinder; and a plurality of dust valves spaced apart on the inner surface of a top plate covering the upper part of the threshing chamber along the rotation axis of the threshing cylinder, for conveying the threshed material from one side of the rotation axis of the threshing cylinder to the other side; each of the plurality of dust valves comprises a fixed dust valve portion and a movable dust valve portion, the fixed dust valve portion being fixedly mounted on the top plate, and the movable dust valve portion being adjacent to the fixed dust valve portion in the circumferential direction and capable of adjusting the conveying angle by swinging.

[0057] According to the present invention, the fixed dust feed valve portion of the dust feed valve is mounted on the top plate in a fixed position, so the shape of the top plate is not limited. Therefore, at the position where the fixed dust feed valve portion is mounted, the shape of the top plate can be formed to allow for smooth transfer of the threshed material as the threshing cylinder rotates. Furthermore, by changing the conveying angle of the movable dust feed valve portion adjacent to the fixed dust feed valve portion in the circumferential direction, the conveying capacity of the threshing cylinder along the rotation axis can be changed.

[0058] As a result, the fixed dust valve section allows for smooth transfer of the threshing material along with the rotation of the threshing cylinder, while the movable dust valve section allows for adjustment of the conveying angle of the dust valve according to changes in the amount of crop fed into the threshing unit. Thus, even changes in the amount of crop can easily eliminate the disadvantage of reduced threshing performance.

[0059] Therefore, the threshing material can be smoothly transferred along with the rotation of the threshing cylinder, and appropriate threshing performance can be maintained depending on the amount of crop brought into the threshing device.

[0060] In this invention, preferably, the fixed dust valve portion and the movable dust valve portion overlap circumferentially such that one of the fixed dust valve portion and the movable dust valve portion located upstream of the rotation direction of the threshing cylinder is located downstream of the processing material conveying direction.

[0061] According to this structure, the dust valve portion located upstream of the threshing cylinder in the rotational direction of the fixed dust valve portion and the movable dust valve portion comes into contact with the threshing material first, thus performing the conveying function, before the dust valve portion located downstream. Furthermore, since the dust valve portion located upstream in the rotational direction is located downstream in the material conveying direction and overlaps with it, the threshing material guided by this portion will not get stuck or stagnate at the step of the dust valve portion located upstream in the material conveying direction, allowing for smooth conveying.

[0062] In this invention, it is preferable that the fixed dust valve portion is located upstream of the rotation direction and the movable dust valve portion is located downstream of the rotation direction, wherein the movable dust valve portion can change and adjust the conveying angle by rotating around a pivot point located at the end on the upstream side of the rotation direction.

[0063] According to this structure, the movable dust valve portion overlaps with the fixed dust valve portion in the circumferential direction, located downstream in the rotation direction and upstream in the process material conveying direction. Furthermore, it oscillates around a pivot point located at this overlapping position. Since the pivot point is located on the side opposite to the side that contacts the threshed material, the threshed material is smoothly conveyed without contacting the pivot point.

[0064] In this invention, preferably, the fixed side corresponding portion of the top plate located on the side of the fixed dust valve is formed in an arc shape along the circumference, and the movable side corresponding portion of the top plate located on the side of the movable dust valve is formed in a flat plate shape, and the fixed side corresponding portion is longer than the movable side corresponding portion along the circumference.

[0065] According to this structure, the fixed side portion of the top plate is formed in an arc shape and is longer than the movable side portion in the circumferential direction, thus enabling smooth transfer of the threshed material along with the rotation of the threshing cylinder over a longer range. On the other hand, since the movable side portion is formed in a flat plate shape, the conveying angle of the movable dust valve portion can be smoothly adjusted.

[0066] In this invention, preferably, the fixed dust valve portion extends beyond the corresponding portion on the fixed side and extends circumferentially toward the corresponding portion on the movable side.

[0067] According to this structure, the fixed dust valve portion extends beyond the corresponding portion of the fixed side, which is formed in an arc shape, and toward the corresponding portion of the movable side, which is formed in a flat plate shape. Therefore, the smooth material transfer achieved by the fixed dust valve portion can continue to the position corresponding to the movable side portion. As a result, the situation where the transfer of threshed material is hindered at the position where the top plate changes from an arc shape to a flat plate shape can be avoided, and the transfer can be carried out smoothly.

[0068] In this invention, it is preferred that the fixed side portion of the top plate is formed separately from the movable side portion.

[0069] Based on this structure, the corresponding arc-shaped fixed side and the corresponding flat movable side can be manufactured separately, so each component is relatively small and lightweight, making it easier to handle. In addition, when performing maintenance work on the threshing chamber, the entire top plate is not composed of large components, but rather small components, making it easy to remove the top plate.

[0070] In this invention, it is preferred that the top plate is integrally formed with the corresponding portion of the fixed side connected to the corresponding portion of the movable side.

[0071] According to this structure, when manufacturing the top plate, by integrally forming the corresponding part on the fixed side and the corresponding part on the movable side, the manufacturing time can be reduced and the cost can be lowered. Attached Figure Description

[0072] Figure 1 This is a diagram illustrating the first embodiment (hereinafter referred to as the diagram). Figure 10 (All views are the same up to this point), which is an overall side view of the combine harvester.

[0073] Figure 2 This is an overall top view of the combine harvester.

[0074] Figure 3 This is a side view showing the support structure of the threshing device.

[0075] Figure 4 This is the front view of the threshing device.

[0076] Figure 5 This is a longitudinal sectional front view of the threshing device.

[0077] Figure 6 This is a left-side view of the threshing device.

[0078] Figure 7 This is a right-side view of the threshing device.

[0079] Figure 8 This is a top view showing the movement of the top plate.

[0080] Figure 9 This is a top view showing the support structure of the top plate in other embodiments.

[0081] Figure 10 This is a side view showing the support structure of the top plate in another embodiment.

[0082] Figure 11 This is a diagram illustrating the second embodiment (hereinafter referred to as the diagram). Figure 23 (All views are the same up to this point), which is an overall side view of the combine harvester.

[0083] Figure 12 This is an overall top view of the combine harvester.

[0084] Figure 13 This is a side view showing the support structure of the threshing device.

[0085] Figure 14 This is the front view of the threshing device.

[0086] Figure 15 This is the front view of the threshing inlet plate configuration section.

[0087] Figure 16 This is a cross-sectional view showing the connection state of the threshing inlet plate.

[0088] Figure 17 This is a longitudinal sectional front view of the threshing device.

[0089] Figure 18 This is a longitudinal sectional front view of the main part of the threshing device.

[0090] Figure 19 This is a longitudinal sectional side view showing the top plate support structure.

[0091] Figure 20 This is a top view showing the installation status of the dust valve.

[0092] Figure 21 This is a bottom view of the top panel from below.

[0093] Figure 22 This is a side view of the threshing device with part of the dividing top plate and dividing wall removed.

[0094] Figure 23 This is a longitudinal sectional front view of a threshing apparatus according to other embodiments. Detailed Implementation

[0095] <First Implementation Method>

[0096] First, refer to Figures 1-10 The first embodiment will be described.

[0097] Hereinafter, based on the accompanying drawings, we will describe the application of the embodiments of the combine harvester of the present invention to a full-feed type combine harvester.

[0098] [Overall Structure]

[0099] like Figure 1 , 2 As shown, the combine harvester includes a harvesting and conveying unit 1 that cuts and conveys crops to the rear, a driver's unit 3 covered by a driver's cab 2, a threshing device 4 that threshes the crops cut by the harvesting and conveying unit 1, a grain bin 5 that stores the grains obtained by the threshing device 4, a power unit 7 with an engine 6 as a power source, a pair of left and right front wheels 8 that cannot be steered but are driven by rotation, and a pair of left and right rear wheels 9 that can be steered. On the left side of the grain bin 5, there is a auger-type grain discharge device H that conveys the stored grains to the outside of the machine body.

[0100] In this embodiment, when defining the forward and backward direction of the machine body, it is defined along the machine body's direction of travel in the operating state; when defining the left and right directions of the machine body, it is defined from the perspective of the machine body's direction of travel. That is, Figure 1 , 2 The direction indicated by the reference numeral "F" in the attached diagram is the front of the aircraft. Figure 1 , 2 The direction indicated by the label "B" in the attached diagram is the rear side of the aircraft. Figure 2 The direction indicated by the "L" in the attached diagram is the left side of the aircraft. Figure 2 The direction indicated by the "R" in the attached diagram is the right side of the aircraft.

[0101] The harvesting and conveying unit 1 is supported at the front of the machine body by a harvesting lifting cylinder 10, which acts as a lifting actuator, and is driven to move freely around a lateral fulcrum P1. The harvesting and conveying unit 1 includes a harvesting head 11 that harvests the planted crops and concentrates the harvested crops toward the center in the harvesting width direction, and a conveying device 12 that conveys the harvested and concentrated crops toward the threshing device 4 at the rear of the machine body.

[0102] The harvesting head 11 is equipped with a rotating reel 13 that pushes the tip of the crop to be harvested backward, a pusher-type cutter 14 that cuts the roots of the crop, and a transverse conveying auger 15 that concentrates the harvested crop toward the center in the harvesting width direction.

[0103] The conveying device 12 has a conveyor within the cylindrical conveying housing 16. The conveyor has a structure in which multiple annular rotating chains are wound around the front and rear wheels, and a locking conveyor body is mounted across the annular rotating chains. The conveying device 12 conveys the crop handed over from the harvesting head 11 to the rear and upward, but this is not shown in the figure.

[0104] The threshing device 4 is located at a low position in the center of the machine body in the left-right direction. Above the threshing device 4 are a grain bin 5 for storing the grains threshed by the threshing device 4 and an engine 6 as a power source. Specifically, the grain bin 5 and the engine 6 are arranged in a parallel direction in the front-rear direction, with the grain bin 5 located on the front side of the machine body and the engine 6 located on the rear side of the machine body. The left and right outer sides of the threshing device 4 are covered by an outer cover 17.

[0105] The outer cover 17 is configured such that the upper side is supported by a pivot support 18 that swings open and closes freely along the front-to-back direction, and in the closed state, it can be held in position by a locking mechanism 19 that can be released by manual operation, which will not be described in detail.

[0106] like Figure 1 , 3 As shown, the lower part of the fuselage has a pair of left and right main frames 20 extending along the front-to-back direction of the fuselage. The left and right main frames 20 support the entire fuselage, and the main frames 20 are equivalent to the fuselage frame.

[0107] The left and right main frames 20 are constructed of channel steel with a roughly C-shaped cross-section, extending from the front to the rear of the fuselage in the longitudinal direction. Axles 8a and 9a of the left and right front wheels 8 and left and right rear wheels 9 are located at a position lower than the left and right main frames 20. The left and right front wheels 8 and left and right rear wheels 9 are positioned on the outer sides of the fuselage in the left and right directions of their respective main frames 20, and the left and right main frames 20 are supported by the left and right front wheels 8 and left and right rear wheels 9.

[0108] [Threshing device]

[0109] Next, the threshing device 4 will be described.

[0110] like Figure 5 , 6 As shown in Figures 7 and 8, the threshing apparatus 4 includes a threshing section 21 for threshing and a sorting section 22 for sorting the processed material after threshing by the threshing section 21.

[0111] Inside the threshing section 21, a threshing chamber 23 is formed for threshing the rice stalks. The sorting section 22, within an internal space surrounded by walls, includes a sorting processing section 24. This sorting processing section 24 separates the threshed material into secondary processed materials such as rice grains, rice grains with stalks, and stalk debris while oscillating and conveying it; details of this will not be elaborated further. Figure 1 As shown, a chopping device 25 is provided on the rear side of the threshing device 4 to chop the threshed material (stalk debris, etc.) after threshing by the threshing device 4.

[0112] The threshing section 21 is supported by the left and right main frames 20. The threshing section 21 is a structure surrounded by plate-shaped left and right side walls 26 and 27, which serve as longitudinal supports, a generally plate-shaped rear wall 28, a generally plate-shaped front wall 29, and a top plate 30. The plate-shaped left and right side walls 26 and 27 extend vertically. The generally plate-shaped rear wall 28 connects the rear ends of the left and right side walls 26 and 27 to each other. The generally plate-shaped front wall 29 connects the front ends of the left and right side walls 26 and 27 to each other. The top plate 30 extends across the left and right side walls 26 and 27 and covers the upper part of the threshing section 21. Openings for the passage of the threshed material are formed in the front wall 29 and the rear wall 28.

[0113] The threshing section 21 has the following structure: it is narrower in the vertical direction at the front of the machine body and wider in the vertical direction towards the rear. Furthermore, the lower end of the threshing section 21 is mounted on the main frame 20, which extends in a roughly horizontal position in the front-to-back direction. Therefore, the upper end of the threshing section 21 is in a forward-sloping posture, with a higher position towards the rear.

[0114] like Figure 5 As shown, the threshing chamber 23 includes a threshing cylinder 31 that rotates about an axis X along the longitudinal direction of the machine body. A screen 32, which is generally arc-shaped when viewed from the front, is provided along the outer periphery of the threshing cylinder 31 on its lower side. In the threshing chamber 23, harvested rice stalks are fed in from the front side of the machine body, and the threshing cylinder 31 and screen 32 are used for threshing. The threshing cylinder 31 is configured with a forward-lower, rear-higher tilt, with its rotation axis X gradually increasing in elevation towards the rear of the machine body. Similarly, the screen 32 is also configured with a forward-lower, rear-higher tilt when viewed from the side.

[0115] like Figure 7 As shown, the right side wall portion 26 of the left and right side wall portions 26 and 27 is formed in a continuous shape such that it becomes wider in the vertical direction as it approaches the rear of the fuselage. For example... Figure 6 As shown, the left side wall 27 located on the left side has a lower side wall 33, an upper side wall 34 and a rear side wall 35. When viewed from the side, the lower side wall 33 is roughly triangular in that it is narrower in the vertical direction at the front of the fuselage and becomes wider in the vertical direction as it moves towards the rear of the fuselage. The upper side wall 34 has a roughly the same width in the front-to-back direction. The rear side wall 35 is located at the rear of the fuselage and is wider in the vertical direction.

[0116] The right side wall 26 has a wall surface covering the entire wall, and a pair of cylindrical longitudinal frames 36 are provided at intervals along the front-back direction at the center of the front-back direction. The lower end of the right side wall 26 is mounted on the upper surface of the main frame 20 and is bolted to the main frame 20.

[0117] The lower side wall portion 33 and the rear side wall portion 35 of the left side wall portion 27 are bolted to the upper surface of the main frame 20. The upper side wall portion 34 is divided into multiple (four) parts along the rotation axis of the threshing cylinder 31, and consists of four dividing walls 37. The upper and lower sides of each dividing wall 37 are bolted together, and the dividing wall 37 can be removed laterally by unbolting the bolts.

[0118] like Figure 7 As shown, a front longitudinal auxiliary frame 40 is provided at the front end of the right side wall portion 26. This front longitudinal auxiliary frame 40 is configured as a square tube and is arranged to extend upward from the main frame 20 in the vertical direction. A rear longitudinal auxiliary frame 41 is provided at the rear end of the right side wall portion 26. The rear longitudinal auxiliary frame 41 has a U-shaped cross section and is arranged to extend upward from the upper and lower middle portions of the right side wall portion 26 in the vertical direction. Furthermore, a side wall upper frame 42 is provided across the front and rear longitudinal auxiliary frames 40 and 41. This side wall upper frame 42 is located at the upper end of the right side wall portion 26 and extends along the rotation axis direction of the threshing cylinder 31.

[0119] like Figure 6As shown, the left side wall 27 also has a rectangular longitudinal auxiliary frame 43 at its front end. This front longitudinal auxiliary frame 43 is arranged to extend upward from the main frame 20 in the vertical direction. At the rear end of the left side wall 27, there is a rear longitudinal auxiliary frame 44. The longitudinal auxiliary frame 44 has a U-shaped cross section and is arranged to extend upward from the upper part of the rear side wall 35. A side wall upper frame 45 is provided across the front and rear longitudinal auxiliary frames 43 and 44. This side wall upper frame 45 is located at the upper end of the left side wall 27 and extends along the rotation axis of the threshing cylinder 31. The left and right side wall upper frames 42 and 45 have a generally U-shaped cross section and extend relatively long from the front of the threshing device 4 to the rear end.

[0120] The screen 32 is divided along the rotation axis of the threshing cylinder 31, and each divided screen is supported in a manner that allows for lateral disassembly and assembly, although this is not shown in the figure. The screen 32 is divided along the rotation axis of the threshing cylinder 31 at the same position as the dividing wall 37 of the upper side wall 34 in the left side wall 27, and can be disassembled and assembled in the same direction, i.e., the left side of the machine body.

[0121] like Figure 5 As shown, the screen 32 is composed of two screen components 48 and 49 divided circumferentially along the threshing cylinder 31. The right-side screen component 48 is blocked and guided by arc-shaped guide members 50 installed on the front and rear sides of the separating member 47, and is supported with its right end abutting against the upper frame 42 of the right side wall. Furthermore, the left end of the screen component 48 is bolted to a relay bracket 51 located at the connection position of the left and right screen components 48 and 49. The right end of the left-side screen component 49 is bolted to the relay bracket 51, and the left end is bolted to the upper frame 45 of the left side wall. In addition, the left and right middle parts are bolted to the separating member 47. The connection to the separating member 47 and the screen component adjacent to it are fastened together.

[0122] Therefore, the left-side screen assembly 49 can be removed to the left and outward by unconnecting the multiple bolts. After removing the left-side screen assembly 49, the right-side screen assembly 48 can be removed by unconnecting the bolts to the relay bracket 51.

[0123] 〔roof〕

[0124] The top plate 30, in the main view, is set in a roughly arc shape, roughly following the rotational trajectory of the outer end of the threshing cylinder 31. For example... Figure 5As shown, the right-side portion of the top plate 30 is formed into a smooth arc shape. The left-side portion of the top plate 30 is formed into a flat plate shape. The top plate 30 is integrally formed in a circumferentially connected state.

[0125] Flange portions 52, which are bent outward into a generally L-shape, are formed at the left and right ends of the top plate 30. These flange portions 52 are supported on the upper end frames 42 and 45 of the side walls on the left and right sides. Furthermore, the flange portions 52 are bolted to the upper end frames 42 and 45 of the side walls at multiple intervals along the front-back direction.

[0126] like Figure 6 , 8 As shown, the threshing cylinder 31 includes an infeed section 53 located at the front end for feeding in cut rice stalks and a threshing section 54 located behind the infeed section 53 for threshing the cut rice stalks. The infeed section 53 uses spiral blades 55 to feed the cut rice stalks fed from the conveyor 12 into the threshing chamber 23. The threshing section 54 includes a plurality of rod-shaped members 56 spaced apart in the circumferential direction and extending along the direction of the rotation axis. Each rod-shaped member 56 is provided with a plurality of rod-shaped threshing teeth 57 that protrude radially outward.

[0127] The position in the top plate 30 corresponding to the threshing section 54 can be detached and reattached along the rotation axis direction, while the position in the top plate 30 corresponding to the feeding section 53 is fixed in position. Furthermore, the top plate 30 is divided along the rotation axis direction into a portion corresponding to the threshing section 54 and a portion corresponding to the feeding section 53. Moreover, the portion in the top plate 30 corresponding to the threshing section 54 is divided into two parts along the rotation axis direction. Therefore, the top plate 30 is divided into three parts along the rotation direction of the threshing cylinder 31, providing three divided top plates 58, 59, and 60.

[0128] Of the three dividing top plates 58, 59, and 60, the front dividing top plate 58, which is located at the foremost side and corresponds to the feeding section 53, is fixed in position. Therefore, the front dividing top plate 58 cannot be disassembled or reassembled along the rotation direction of the threshing cylinder 31. This is because, in the area corresponding to the feeding section 53, the harvested straw is only transported by the auger blades 55, thus the top plate 30, like the threshing processing section 54, has less risk of wear.

[0129] Of the three dividing top plates 58, 59, and 60, the two dividing top plates corresponding to the threshing section 54—namely, the central dividing top plate 59 located at the front-to-back center and the rear dividing top plate 60 located at the rearmost part—can be removed towards the rear of the machine body along the rotation direction of the threshing cylinder 31. The central dividing top plate 59 and the rear dividing top plate 60 have connecting flanges 52 and 61 on their left and right sides and at their front and rear ends. The flanges 52 on the left and right sides are bolted to the upper sidewall frames 42 and 45. Furthermore, the flanges 61 of the front dividing top plate 58 and the central dividing top plate 59 are connected to each other in the front-to-back direction, and the flanges of the central dividing top plate 59 and the rear dividing top plate 60 are also connected in the front-to-back direction.

[0130] like Figure 5 , 6 As shown in Figures 7 and 8, the transverse plate portion 62, which serves as the support portion for the top plate 30 in the upper sidewall frames 42 and 45 on both the left and right sides, is equipped with an anti-fall guide 64 having a longitudinal surface 63. Multiple anti-fall guides 64 are provided at appropriate intervals along the length of the upper sidewall frames 42 and 45. When viewed in the front-rear direction, the anti-fall guide 64 is composed of a roughly L-shaped plate body, and is installed in the transverse plate portion 62 of the upper sidewall frames 42 and 45 with the longitudinal surface 63 located at the lateral end of the transverse plate portion 62. Using the left and right anti-fall guides 64 installed on the upper sidewall frames 42 and 45 on both the left and right sides, the top plate 30 is guided in a manner that does not change its orientation in the lateral direction, allowing it to move smoothly backward.

[0131] When removing the central side dividing top plate 59 and the rear side dividing top plate 60, firstly, the outer cover 17 is swung outward around the upper axis to open the threshing device 4 to the lateral side. Then, the bolts connecting the central side dividing top plate 59 and the rear side dividing top plate 60 to the upper side frames 42 and 45 on the left and right sides are released from the side of the machine body. Next, after removing the rear wall 28 of the threshing device 4, the rear side dividing top plate 60 is slid backward on the upper surfaces of the upper side frames 42 and 45 on the left and right sides (see reference). Figure 8 Furthermore, the central side dividing top plate 59 is slid and removed rearward. After removing the central side dividing top plate 59 and the rear side dividing top plate 60 in this way, the space above the threshing cylinder 31 is greatly opened, so that maintenance operations such as repair and inspection, and removal of clogging straw can be easily performed on the threshing cylinder 31 from the rear outside or the side outside the machine body.

[0132] A dust-feeding valve 74 is provided in the threshing chamber 23, located on the inner surface of the top plate 30, to convey the threshed material from the front side of the machine body toward the rear side. Multiple dust-feeding valves 74 are respectively installed on the inner surface of the top plate 30, positioned on the outer periphery of the threshing cylinder 31 and extending in a generally spiral shape. That is, the dust-feeding valves 74 are arranged at a predetermined conveying angle, with their position changing from the upstream side of the threshing cylinder 31 toward the downstream side as it moves, towards the rear side of the threshing cylinder 31, to convey the threshed material toward the rear side of the machine body relative to the rotation of the threshing teeth 57.

[0133] Multiple dust valves 74 each have a fixed dust valve portion 75 and a movable dust valve portion 76. The fixed dust valve portion 75 is mounted on the top plate 30 in a fixed position. The movable dust valve portion 76 is adjacent to the fixed dust valve portion 75 in the circumferential direction and can be adjusted by swinging to change the conveying angle. Figure 5 As shown, the fixed dust valve portion 75 is positioned upstream of the threshing cylinder 31 in the direction of rotation, while the movable dust valve portion 76 is positioned downstream of the threshing cylinder 31 in the direction of rotation. Furthermore, the fixed dust valve portion 75 is positioned further downstream of the processed material conveying direction than the movable dust valve portion 76, and the fixed dust valve portion 75 and the movable dust valve portion 76 are arranged to overlap circumferentially.

[0134] like Figure 5 As shown, the fixed dust valve portion 75 is mounted on the inner surface of the right-side arc-shaped portion 30a in the top plate 30, and the movable dust valve portion 76 is mounted on the inner surface of the right-side flat portion 30b in the top plate 30. The upstream end of the movable dust valve portion 76 in the rotation direction is supported on the top plate 30 by a pivot shaft 79 with the pivot point P2 as the center. The downstream end of the movable dust valve portion 76 in the rotation direction can have its swing angle adjusted manually via an adjustment member 80.

[0135] [Grain bin and engine support structure]

[0136] On both sides of the threshing device 4, there are upper frames 65 and 66 that are supported on the main frame 20 and extend along the rotation axis of the threshing cylinder 31. The grain box 5 and the engine 6 are supported by the left and right upper frames 65 and 66.

[0137] Furthermore, such as Figure 5 , 7 As shown, the front and rear longitudinal frames 36, mounted on the right side wall 26, are arranged to extend vertically upwards from the upper end of the main frame 20. The front and rear longitudinal frames 36 extend upwards compared to the upper side wall frame 42. Figure 3 , 5As shown, a pair of longitudinal frames 67 are provided on the left side wall 27, extending vertically upwards from the main frame 20. These left-side longitudinal frames 67 are cylindrical and extend upwards beyond the upper frame 45 of the side wall. Furthermore, the left-side longitudinal frames 67 are positioned slightly to the left and outwards from the left side wall 27, spaced apart from it in the left-right direction.

[0138] Moreover, such as Figure 7 As shown, on the right side of the threshing device 4, an upper frame 65 is provided above the front longitudinal auxiliary frame 40, a pair of longitudinal frames 36, and the rear longitudinal auxiliary frame 41. Figure 3 As shown, on the left side of the threshing device 4, an upper frame 66 is provided above the front longitudinal auxiliary frame 43, a pair of longitudinal frames 67 and the rear longitudinal auxiliary frame 44.

[0139] The left and right upper frames 65 and 66 extend along the rotation axis of the threshing cylinder 31 (front-to-back direction of the machine body) and are arranged in an inclined posture with the front lower and the rear higher. The upper frames 65 and 66 are configured such that the upper surface is wider in the left-to-right direction. The grain bin 5 and the engine 6 are supported on the upper surface of the left and right upper frames 65 and 66.

[0140] like Figure 3 As shown, the bottom surface of the grain bin 5 is wider at the top and narrower at the bottom. The front side of the bottom surface, which is sloping downwards from the front to the rear, is supported by the front side support frame 68, and the rear side of the bottom surface, which is sloping downwards from the front to the rear, is supported by the rear side support frame 69. The front side support frame 68 extends across the left and right sides of the threshing device 4 and supports the upper frames 65 and 66 on the left and right sides, and is bolted to them. Similarly, like the front side support frame 68, the rear side support frame 69 extends across the left and right sides of the threshing device 4 and supports the upper frames 65 and 66 on the left and right sides.

[0141] The rear side support frame 69 has left and right box side support portions 70 located on the left and right sides and left and right connecting portions (not shown) that connect the left and right box side support portions 70 to each other. The left and right box side support portions 70 are formed into a generally trapezoidal frame shape when viewed from the side, and are supported on the left and right upper frames 65 and 66.

[0142] The engine support frame 72, which supports the engine 6, extends across the left and right sides of the threshing device 4 and is mounted on the upper frames 65 and 66 on the left and right sides. Figure 3 As shown, the engine support frame 72 includes left and right side longitudinal sections 73 extending in the front-rear direction on the upper side of the left and right upper frames 65 and 66, and a transverse connecting member (not shown) connecting them.

[0143] [Other embodiments of the first embodiment]

[0144] (1) In the above embodiment, the top plate 30 and the upper frame 42, 45 of the side wall slide and move at the same time, but various structures described below can be used to replace this structure.

[0145] (1-1)

[0146] For example, Figure 9 , 10 As shown, it can also be configured such that a rotating roller 85, which serves as a rotating body that contacts and rotates with the upper sidewall frames 42 and 45, is provided on the top plate 30. The rotating roller 85 is provided on the left and right sides of the front end of the movable segmented top plates 59 and 60, and is rotatably supported on the front end of an arm 86 extending forward from the front end of the segmented top plates 59 and 60. When the segmented top plates 59 and 60 are entirely supported on the upper sidewall frames 42 and 45, the rotating roller 85 is in a state where it is slightly raised from the surface of the transverse plate portion 62 in the upper sidewall frames 42 and 45. Moreover, when the segmented top plates 59 and 60 are removed, if the rear end of the segmented top plates 59 and 60 is manually slightly lifted to a tilted posture with the front lower and the rear higher, the rotating roller 85 becomes in a state of contact with the surface of the transverse plate portion 62.

[0147] By rotating and moving the rotating roller 85 in this state, the dividing top plates 59 and 60 can be easily slid.

[0148] (1-2)

[0149] Alternatively, the top plates 59 and 60 may be configured with multiple rotating rollers (not shown) on both sides, and a support mechanism (not shown) that supports these rotating rollers in a state that can switch between a state where they protrude downwards from the lower end of the top plate and a state where they retract upwards from the lower end of the top plate. A cam-type lifting mechanism or similar support mechanism is preferable. By manually switching the support mechanism to the protruding state, the top plate can be easily slid.

[0150] (1-3)

[0151] Alternatively, a sliding facilitator that enables smooth sliding movement can be provided on any one of the top plates 59 and 60 and the upper sidewall frames 42 and 45 to replace the rotating roller 85. For example, a fluoropolymer material can be used as the sliding facilitator.

[0152] (2) In the above embodiment, multiple anti-fall guides 64 are provided at appropriate intervals along the length direction of the upper frame 42, 45 of the side wall. However, the structure can also be replaced by a continuous and longer extension of the anti-fall guides 64 along the length direction of the upper frame 42, 45 of the side wall.

[0153] (3) In the above embodiment, a structure is adopted in which the top plate 30 is divided into three partitioned top plates 58, 59, and 60 along the front-back direction. However, it is not limited to this structure. A structure in which the top plate 30 is divided into two parts, a structure in which it is divided into four or more parts, or a structure in which the top plate 30 is not divided but is connected as a whole can also be adopted.

[0154] (4) In the above embodiment, a structure is adopted in which the grain box 5 and the engine 6 are respectively arranged above the threshing device 4. However, this structure can be replaced by a structure in which the grain box 5, the engine 6 and the threshing device 4 are arranged in a horizontal parallel manner.

[0155] <Second Implementation Method>

[0156] Next, refer to Figures 11-23 The second embodiment will be described.

[0157] Hereinafter, based on the accompanying drawings, we will describe the application of the embodiments of the combine harvester of the present invention to a full-feed combine harvester.

[0158] [Overall Structure]

[0159] like Figure 11 , 12 As shown, the combine harvester includes a harvesting and conveying unit 201 that harvests and conveys crops to the rear, a driver's unit 203 covered by a driver's cab 202, a threshing device 204 that threshes the crops harvested by the harvesting and conveying unit 201, a grain bin 205 that stores the grains obtained by the threshing device 204, a power unit 207 with an engine 206 as a power source, a pair of left and right front wheels 208 that cannot be steered but are driven by rotation, and a pair of left and right rear wheels 209 that can be steered. On the left side of the grain bin 205, there is a auger-type grain discharge device that conveys the stored grains to the outside of the machine.

[0160] In this embodiment, when defining the forward and backward direction of the machine body, it is defined along the machine body's direction of travel in the operating state; when defining the left and right directions of the machine body, it is defined from the perspective of the machine body's direction of travel. That is, Figure 11 , 12 The direction indicated by the reference numeral "F" in the attached diagram is the front of the aircraft. Figure 11 , 12 The direction indicated by the label "B" in the attached diagram is the rear of the aircraft. Figure 12 The direction indicated by the "L" in the attached diagram is the left side of the aircraft. Figure 12 The direction indicated by the "R" in the attached diagram is the right side of the aircraft.

[0161] The harvesting and conveying unit 201 is supported at the front of the machine body by a harvesting lifting cylinder 210, which acts as a lifting actuator, and is driven to rise and fall freely around a lateral fulcrum P1. The harvesting and conveying unit 201 includes a harvesting head 211 that harvests the planted crops and concentrates the harvested crops toward the center in the harvesting width direction, and a conveying device 212 that conveys the harvested and concentrated crops toward the threshing device 204 at the rear of the machine body.

[0162] The harvesting head 211 includes a rotating reel 213 that pushes the tip of the crop to be harvested backward, a pusher-type cutter 214 that cuts the roots of the crop, and a transverse conveying auger 215 that concentrates the harvested crop toward the center in the harvesting width direction.

[0163] The conveying device 212 has a conveying conveyor inside the cylindrical conveying housing 216. The conveying conveyor has a structure in which a pair of left and right annular rotating chains are wound around the front and rear wheels, and multiple locking conveying bodies are mounted across each annular rotating chain. The conveying device 212 conveys the crop handed over from the harvesting head 211 to the rear and upward, but this is not shown in the figure.

[0164] The threshing device 204 is located at a low position in the center of the machine body in the left-right direction. Above the threshing device 204, in a parallel direction along the front-back direction, the grain bin 205 and the engine 206, which serves as the power source, are arranged with the grain bin 205 located on the front side of the machine body and the engine 206, which serves as the power source, located on the rear side of the machine body. The outer sides of the left and right sides of the threshing device 204 are covered by an outer cover 217. The outer cover 217 is configured such that its upper part is supported by a pivot support 218 in the front-back direction, which can be swung open and closed freely. In the closed state, it can be held in position by a locking mechanism 219 that can be released by manual operation. This will not be described in detail.

[0165] like Figure 11 , 13 As shown, the lower part of the fuselage has a pair of left and right main frames 220 extending along the front-rear direction of the fuselage. The left and right main frames 220 support the entire fuselage, and the main frames 220 are equivalent to the fuselage frame.

[0166] The left and right main frames 220 are constructed of channel steel with a roughly C-shaped cross-section, extending from the front to the rear of the fuselage in the longitudinal direction. Axles 208a and 209a of the left and right front wheels 208 and left and right rear wheels 209 are located at a position lower than the left and right main frames 220. The left and right front wheels 208 and left and right rear wheels 209 are positioned on the outer sides of the fuselage in the left and right directions of their respective main frames 220, and the left and right main frames 220 are supported by the left and right front wheels 208 and left and right rear wheels 209.

[0167] [Threshing device]

[0168] Next, the threshing device 204 will be described.

[0169] like Figure 13 , 14 As shown in Figures 1 and 17, the threshing apparatus 204 includes a threshing section 221 for performing threshing and a sorting section 222 for sorting the processed material after threshing by the threshing section 221.

[0170] like Figure 17 As shown, a threshing chamber 223 for threshing the harvested rice stalks is formed inside the threshing section 221. The sorting section 222 has a sorting processing section 224 (see reference) within an internal space surrounded by a rectangular peripheral wall. Figure 17 The sorting and processing unit 224 is used to sort the threshed material into secondary processed materials such as grains, grains with stalks, and stalk debris while oscillating and conveying it. Details on this will not be provided further. Figure 11 As shown, a chopping device 225 is provided on the rear side of the threshing device 204 to chop the threshed material (stalk debris, etc.) after threshing by the threshing device 204.

[0171] like Figure 13 , 14 As shown in Figure 17, the threshing section 221 is supported on the left and right main frames 220. The threshing section 221 is a structure surrounded by plate-shaped left and right sidewalls 226 and 227, which serve as longitudinal supports, a generally plate-shaped rear wall 228, a generally plate-shaped front wall 229, and a top plate 230. The plate-shaped left and right sidewalls 226 and 227 extend vertically. The generally plate-shaped rear wall 228 connects the rear ends of the left and right sidewalls 226 and 227 to each other. The generally plate-shaped front wall 229 connects the front ends of the left and right sidewalls 226 and 227 to each other. The top plate 230 extends across the left and right sidewalls 226 and 227 and covers the upper part of the threshing section 221. Openings for the passage of the threshed material are formed in the front wall 229 and the rear wall 228.

[0172] The threshing section 221 has the following structure: it is narrower in the vertical direction at the front of the machine body and wider in the vertical direction towards the rear. Furthermore, the lower end of the threshing section 221 is mounted on the main frame 220, which extends in a roughly horizontal position in the front-to-back direction. Therefore, the upper end of the threshing section 221 is in a forward-sloping posture, with a higher position towards the rear.

[0173] like Figure 17 As shown, the right side wall portion 226 of the left and right side wall portions 226 and 227 is connected in the vertical direction. For example... Figure 13As shown, the left side wall 227 located on the left side has a lower side wall 231 and an upper side wall 232. When viewed from the side, the lower side wall 231 is roughly triangular in that it is narrower in the vertical direction at the front of the fuselage and becomes wider in the vertical direction as it moves towards the rear of the fuselage. The upper side wall 232 has a roughly the same width in the front-rear direction.

[0174] The lower end of the right side wall portion 226 rests on the upper surface of the main frame 220 and is bolted to the main frame 220. The lower end of the lower side wall portion 231 of the left side wall portion 227 rests on the upper surface of the main frame 220 and is bolted to the main frame 220. The lower end of the upper side wall portion 232 of the left side wall portion 227 rests on the upper end of the lower side wall portion 231 and is bolted to it. Figure 17 , 18 As shown, the upper end of the upper side wall portion 232 is connected to the fixed bracket 233 by bolts.

[0175] like Figure 13 , 17 As shown in Figures 18 and 20, the threshing chamber 223 includes a threshing cylinder 234 that rotates about an axis X along the longitudinal direction of the machine body. A screen 235, which is generally arc-shaped in frontal view, is provided along the outer periphery of the threshing cylinder 234 on its lower side. In the threshing chamber 223, harvested rice straw is fed in from the front side of the machine body, and threshing is performed using the threshing cylinder 234 and the screen 235. The threshing cylinder 234 is configured with a forward-lower, rear-higher tilt, with its rotation axis X gradually increasing in elevation towards the rear of the machine body. Similarly, the screen 235 is also configured with a forward-lower, rear-higher tilt in side view.

[0176] [Segmentation of the top slab]

[0177] like Figure 13 , 14 As shown, the top plate 230 is composed of a plurality of segmented top plates 236 divided along the rotation axis of the threshing cylinder 234. Furthermore, at the dividing boundary 237 between the plurality of segmented top plates 236, support frames 238 extending laterally from one side of the threshing device 204 to the other are respectively provided. The support frames 238 are composed of longitudinally oriented plate-like bodies, specifically six in number. The five segmented top plates 236, separated by the six support frames 238, are respectively configured to be detachable and removable laterally.

[0178] like Figure 17 , 18As shown, the top plate 230 covering the threshing chamber 223, specifically a plurality of segmented top plates 236, are respectively configured in a generally curved shape in the front view, roughly along the rotational trajectory of the outer end of the threshing cylinder 234. Furthermore, each segmented top plate 236 is composed of two top plate components 239 and 240 divided circumferentially along the threshing cylinder 234. The right top plate component 239, corresponding to the right half of the two top plate components 239 and 240, is formed into a smooth arc shape. The left top plate component 240, corresponding to the left half, is a shape having three flat plate sections, with the flat plate body curved in two positions.

[0179] The right end of the right top plate component 239 is bolted to a fixed bracket 241 fixed to the support frame 238. The right top plate component 239 is a structure that uses an arc-shaped guide rail 242 provided on the side of the support frame 238 to maintain the position of the front and rear sides. Figure 18 , 19 As shown, the guide rail portion 242 has an inner guide rail portion 242a on the inner periphery side and an outer guide rail portion 242b on the outer periphery side, and is slidably supported in a state in which the inner guide rail portion 242a and the outer guide rail portion 242b clamp the end of the right top plate component 239.

[0180] A locking portion 239a is formed at the left end of the right top plate component 239. This locking portion 239a is bent outward into an approximately L-shape to block the end of the left top plate component 240, and is restrained by the abutment member 243 from above. Figure 14 As shown, the abutting member 243 is configured to extend long in the front-to-back direction in such a way that it abuts against the five segmented top plates 236 from above, and the abutting member 243 is fixed to the six support frames 238 by bolts.

[0181] like Figure 17 , 18 As shown, the left top plate component 240 has longitudinally oriented mounting surfaces 240a at its front and rear ends. The mounting surfaces 240a are bolted together at multiple points to fix the left top plate component 240 to the support frame 238, with the mounting surfaces 240a abutting against the support frame 238. The left top plate components 240, located on the front and rear sides relative to the support frame 238, are fixed together with bolts through the support frame 238. The left outer end of the left top plate component 240 is bolted to the fixing bracket 233.

[0182] like Figure 20As shown, the threshing cylinder 234 includes an input section 244 located at the front end for feeding in cut rice stalks and a threshing section 245 located behind the input section 244 for threshing the cut rice stalks. The input section 244 uses spiral blades 246 to feed the cut rice stalks fed from the conveyor 212 into the threshing chamber 223. The threshing section 245 has a plurality of rod-shaped members 247 spaced apart in the circumferential direction, and each rod-shaped member 247 has a plurality of rod-shaped threshing teeth 248 protruding radially outward.

[0183] The five segmented top plates 236 in the top plate 230 corresponding to the threshing section 245 are designed to be detachable and removable laterally. The upper surface 249 of the threshing cylinder 234 corresponding to the feed section 244 is circumferentially connected and cannot be detached and removable laterally. This is because there is no screen 235 in this area, resulting in a lower frequency of maintenance.

[0184] The top plate 230 of the above structure can be removed outward toward the left side of the fuselage, which is an example of the transverse side of the fuselage. When removing the top plate 230, firstly, the bolt connection between the left top plate component 240 and the support frame 238 is released, allowing removal outward toward the left side of the fuselage. Next, the bolt connection between the right top plate component 239 and the fixed bracket 241 is released. At this time, the work is performed through an opening formed at an appropriate position in the right side wall portion 226. After releasing the bolt connection, it can be slid outward toward the left side of the fuselage along the guide rail portion 242 and pulled outward to the left.

[0185] [Segmentation of the sidewall]

[0186] like Figure 13 As shown, the upper sidewall portion 232 of the left sidewall portion 227 is positioned corresponding to the lower portion of the threshing cylinder 234 and the screen 235 when viewed from the side. This upper sidewall portion 232 is composed of a plurality of segmented walls 251 divided along the rotation axis of the threshing cylinder 234. The segmented walls 251 are supported so that they can be disassembled and reassembled laterally.

[0187] The partition wall 251 is divided along the direction of the rotation axis at the same position as the top plate 230, and can be disassembled and installed in the same direction as the top plate 230, i.e., on the left side of the machine body. Furthermore, as described above, the upper and lower parts of the partition wall 251 (upper side wall portion 232) are bolted together; therefore, by releasing these bolts, the partition wall 251 (upper side wall portion 232) can be removed to the left and outward. Note that... Figure 13 , 14 As shown, a pair of longitudinal frames 252 are provided on the left side of the threshing device 204 in a state of standing from the main frame 220. A gap is formed between the longitudinal frames 252 and the dividing wall 251 that is adjacent to them in the lateral direction, through which the dividing wall 251 can be removed.

[0188] [Screening Structure of the Screen]

[0189] The screen 235 is composed of multiple segmented screens 253 divided along the rotation axis of the threshing cylinder 234. The segmented screens 253 are supported so as to be disassembled and assembled laterally. The screen 235 is divided at the same position as the top plate 230 along the rotation axis of the threshing cylinder 234, and can be disassembled and assembled in the same direction as the top plate 230, i.e., the left side of the machine body.

[0190] The screen 235 is positioned corresponding to the four front-side dividing top plates 236 of the five dividing top plates 236, and has four dividing screens 253. The screen 235 is generally curved in the main view, roughly along the rotational trajectory of the outer end of the threshing cylinder 234. Furthermore, as... Figure 17 As shown, each dividing screen 253 is composed of two screen components 254 and 255 divided circumferentially along the threshing cylinder 234.

[0191] The right-side screen assembly 254 is supported by arc-shaped guide members 256 mounted on the front and rear sides of the support frame 238, with its right end abutting against the right-side fixed bracket 241. Furthermore, its left end is bolted to a relay bracket 257 located at the connection point between the left and right screen assemblies 254 and 255. The right end of the left-side screen assembly 255 is bolted to the relay bracket 257, and its left end is bolted to the left-side fixed bracket 233. Additionally, the left and right middle portions are bolted to the support frame 238. The connection points to the support frame 238 and the adjacent screen assembly 255 across the support frame 238 are all securely fastened together.

[0192] Therefore, the left-side screen assembly 255 can be removed to the left and outward by releasing the connection of multiple bolts. After removing the left-side screen assembly 255, the right-side screen assembly 254 can be removed by releasing the bolt connection relative to the relay bracket 257.

[0193] like Figure 15 As shown, at the front part of the threshing cylinder 234 corresponding to the feed section 244, and at the position below the upper surface 249, a threshing inlet plate 259 is provided to guide the cut rice stalks conveyed by the conveying device 212 to the inlet of the threshing chamber 223. The threshing inlet plate 259 has a side portion 260 covering the left and right sides of the feed section 244 of the threshing cylinder 234, and a bottom portion 261 formed in a shape that gradually increases in diameter from the outlet of the conveying device 212 toward the threshing cylinder 234. The bottom portion 261 is divided by a separating surface at the center in the left-right direction.

[0194] Therefore, the threshing inlet plate 259 has a structure consisting of four parts: left and right side portions 260 and left and right bottom portions 261. Furthermore, the left side portion 260 and the left bottom portion 261 are connected by bolts with partial overlap. Similarly, the right side portion 260 and the right bottom portion 261 are connected by bolts with partial overlap. Figure 16 As shown, a hexagonal hole is formed on the head of bolt Bo, which can engage a hexagonal wrench. Note that the left and right side portions 260 are connected to the upper surface 249 by bolts via flanges. Even if the threshing inlet plate 259 is worn due to crop flow, it can be easily removed by unbolting the bolts. The left and right side portions 260 can be removed laterally, and the left and right bottom portions 261 can be removed towards the front of the machine body with the conveyor 212 removed.

[0195] [Grain bin and engine support structure]

[0196] like Figure 14 , 17 As shown in Figure 22, on both sides of the threshing device 204, there are upper frames 262 extending along the rotation axis direction (front-rear direction of the machine body) of the threshing cylinder 234, spanning the upper part of multiple support frames 238. The upper frames 262 are configured in an inclined posture with the front lower and the rear higher, and the upper surface of the upper frames 262 is wider in the left-right direction. Moreover, the grain bin 205 and the engine 206 are mounted and supported on the left and right upper frames 262. On the left side of the threshing device 204, a pair of longitudinal frames 252 are provided in a state of standing from the main frame 220.

[0197] like Figure 13 As shown, the bottom surface of the grain bin 205 is wider at the top and narrower at the bottom. The front side of the bottom surface, which is sloping downwards from the front to the rear, is supported by the front side support frame 263, and the rear side of the bottom surface, which is sloping downwards from the front to the rear, is supported by the rear side support frame 264. The front side support frame 263 extends across the left and right sides of the threshing device 204 and is mounted on the upper frames 262 on the left and right sides and is bolted to them. Similarly, the rear side support frame 264 extends across the left and right sides of the threshing device 204 and is mounted on the upper frames 262 on the left and right sides.

[0198] The rear side support frame 264 includes left and right box-side support portions 265 that are generally trapezoidal in shape when viewed from the side, and left and right connecting portions (not shown) that connect the left and right box-side support portions 265 to each other. The left and right box-side support portions 265 respectively support the upper frames 258 on the left and right sides.

[0199] An engine support frame 267 supporting the engine 206 extends across the left and right sides of the threshing device 204 and is mounted on the upper frames 262 supporting the left and right sides. The engine support frame 267 includes left and right longitudinal side portions 268 extending in the front-rear direction on the upper side of the upper frames 262 and transverse connecting members (not shown) connecting them.

[0200] [Dust supply valve]

[0201] A dust-feeding valve 270 is provided in the threshing chamber 223, located on the inner surface of the top plate 230, to move the threshed material from one side (front of the machine body) to the other side (rear of the machine body) in the direction of the rotation axis of the threshing cylinder 234. Figure 20 , 21 As shown, multiple dust valves 270 are arranged at intervals along the rotation axis, from the front end of the threshing cylinder 234 to the rear end of the threshing cylinder 234. Each dust valve 270 is mounted on the inner surface of the top plate 230, positioned on the outer periphery of the threshing cylinder 234 and extending in a spiral shape. That is, the dust valves 270 are arranged at a predetermined conveying angle, shifting their position from the upstream side of the threshing cylinder 234 towards the downstream side, and towards the rear of the threshing cylinder 234, to move the threshed material towards the rear of the machine body relative to the rotation of the threshing teeth 248.

[0202] Multiple dust valves 270 each have a fixed dust valve portion 271 and a movable dust valve portion 272. The fixed dust valve portion 271 is mounted on the top plate 230 in a fixed position. The movable dust valve portion 272 is adjacent to the fixed dust valve portion 271 in the circumferential direction and can be adjusted by swinging to change the conveying angle. Figure 18 As shown, the fixed dust valve portion 271 is positioned upstream of the threshing cylinder 234 in the direction of rotation, while the movable dust valve portion 272 is positioned downstream of the threshing cylinder 234 in the direction of rotation. Furthermore, the fixed dust valve portion 271 is positioned further downstream of the processed material conveying direction than the movable dust valve portion 272, and the fixed dust valve portion 271 and the movable dust valve portion 272 are circumferentially overlapped.

[0203] Furthermore, such as Figure 18 As shown, both the fixed dust valve section 271 and the movable dust valve section 272 are connected to the mounting surface along the top plate 230 and have a conveying action surface 274 extending orthogonally to it, with a cross-section that is approximately L-shaped. The threshing cylinder 234 rotates clockwise in the main view. Downstream of the rotation direction of the fixed dust valve section 271 ( Figure 18The right side of the machine body is extended to form a conveying surface 274, which is located downstream of the movable dust valve portion 272 in the process material transfer direction, i.e., the rear side in the front-rear direction of the machine body, and is set to coincide with the movable dust valve portion 272 in the circumferential direction.

[0204] The fixed dust valve portion 271 includes a first fixed dust valve portion 271a fixed to the inner surface of the right top plate component 239 and a second fixed dust valve portion 271b fixed to the inner surface of the right flat plate portion 240A in the left top plate component 240. The connection position between the first fixed dust valve portion 271a and the second fixed dust valve portion 271b is the same as the position coinciding with the movable dust valve portion 272, and is also downstream in the rotation direction of the first fixed dust valve portion 271a. Figure 18 The right side of the machine body is extended to form a conveying surface 274, which is located downstream of the processing material conveying direction, i.e., the rear side of the machine body in the front-rear direction, relative to the second fixed dust valve portion 271b, and is arranged to coincide with the second fixed dust valve portion 271b in the circumferential direction.

[0205] The movable dust valve portion 272 is mounted on the inner surface of the flat plate portion 240B located on the left side of the left top plate component 240. The right top plate component 239 corresponds to the fixed side portion, and the left top plate component 240 corresponds to the movable side portion, with the fixed side portion being longer than the movable side portion. Furthermore, the fixed dust valve portion 271 extends circumferentially toward the movable side portion beyond the fixed side portion, i.e., the right top plate component 239.

[0206] The portion of the movable dust valve 272 that overlaps with the second fixed dust valve 271b, which is the upstream end in the rotation direction, is rotatably supported on the top plate 230 with the rotation axis P2 as the center. The downstream end of the movable dust valve 272 in the rotation direction (the side opposite to the second fixed dust valve 271b) can have its swing angle changed by manual operation via the adjustment member 275.

[0207] Furthermore, the upstream end of the movable dust valve section 272 in the direction of rotation is supported on the top plate 230 by a support shaft 276. An adjusting member 275 is bolted to the downstream end of the movable dust valve section 272 in the direction of rotation. The adjusting member 275 can be manually slidable within the range of the elongated hole 277 (see reference). Figure 21 If the bolts are loosened and the adjusting component 275 is slidably operated, the movable dust valve part 272 can swing around the pivot P2 (rotation fulcrum) of the support shaft 276 to change the conveying angle for transferring the threshed material. After changing the conveying angle, the bolts can be tightened to fix the position.

[0208] [Other embodiments of the second embodiment]

[0209] (1) In the above embodiment, the top plate 230 is divided circumferentially, and the fixed dust valve portion 271 includes a first fixed dust valve portion 271a and a second fixed dust valve portion 271b. However, this structure can be replaced by other methods, such as... Figure 23 As shown, the top plate 230 is configured such that the arc-shaped portion 230a and the flat portion 230b are connected together circumferentially, and a fixed dust valve portion 271 is integrally formed in a state corresponding to the arc-shaped portion 230a of the top plate 230, and a movable dust valve portion 272 is provided in a state corresponding to the flat portion 230b.

[0210] (2) In the above embodiment, a structure is adopted in which the fixed dust valve portion 271 is located downstream of the processing material transfer direction than the movable dust valve portion 272. However, this structure can be replaced by a structure in which the fixed dust valve portion 271 is located upstream of the processing material transfer direction than the movable dust valve portion 272.

[0211] (3) In the above embodiment, a structure is shown in which the top plate 230 is composed of five segmented top plates 236 divided along the rotation axis of the threshing cylinder 234. Moreover, each of the five segmented top plates 236 is composed of two top plate constituents 239 and 240 divided along the circumference of the threshing cylinder 234. However, this structure can be replaced by, for example, a structure composed of four or fewer, or six or more segmented top plates, or a structure in which the segmented top plates are composed of three or more top plate constituents. In addition, the multiple segmented top plates can be configured as an integral shape connected together along the circumference of the threshing cylinder 234, or the top plate 230 can be made as an integral continuous shape instead of being divided along the rotation axis of the threshing cylinder 234.

[0212] (4) In the above embodiment, a structure is shown in which the screen 235 and the side wall portion 227 are separated along the rotation axis direction at the same position as the top plate 230, and can be detached and assembled in the same direction as the top plate 230. However, this structure can be replaced by a structure that is separated along the rotation axis direction at a different position from the top plate 230, or a structure that can be detached and assembled in a different direction from the top plate 230. In addition, a structure in which the screen and the side wall portion are not separated can also be used.

[0213] (5) In the above embodiment, a structure is adopted in which the grain box 205 and the engine 206 are respectively arranged above the threshing device 204. However, the structure can be replaced by a structure in which the grain box 205, the engine 206 and the threshing device 204 are arranged in a horizontal parallel manner.

[0214] Industrial applicability

[0215] This invention is not limited to full-feed combine harvesters, but can also be applied to semi-feed combine harvesters.

[0216] Explanation of reference numerals in the attached figures

[0217] 4 Threshing device

[0218] 5 Grain bins

[0219] 6 engines

[0220] 20. Airframe

[0221] 23 Threshing Chamber

[0222] 26, 27 Side wall sections

[0223] 30 Top Plate

[0224] 31 Threshing cylinder

[0225] 32 mesh

[0226] 42, 45 Upper frame of side walls

[0227] 53 Dial-in Section

[0228] 54 Threshing Processing Department

[0229] 58, 59, 60 Segmented Top Slab

[0230] 62 Support section

[0231] 63 Longitudinal plane

[0232] 64 Anti-fall guide

[0233] 65, 66 Upper frame

[0234] 204 Threshing device

[0235] 205 Grain Box

[0236] 206 engine

[0237] 223 Threshing Chamber

[0238] 227 Sidewall

[0239] 230 Top Plate

[0240] 234 Threshing cylinder

[0241] 235 mesh

[0242] 236 Segmented Top Plate

[0243] 238 Support Frame

[0244] 239 Fixed side corresponding part (top plate component)

[0245] 240 Movable side corresponding part (top plate component)

[0246] 251 Dividing Wall

[0247] 253 Segmented Screen

[0248] 262 Upper Frame

[0249] 270 Dust valve

[0250] 271 Fixed dust supply valve section

[0251] 272 Movable dust valve section

Claims

1. A combine harvester, wherein, The combine harvester is equipped with a threshing device that threshes the harvested rice stalks in a threshing chamber. The threshing chamber includes a threshing cylinder that rotates about a front and rear axis and an arc-shaped screen arranged along the outer periphery of the threshing cylinder. The top plate covering the upper part of the threshing chamber is supported so that it can be disassembled and reassembled laterally. The top plate is composed of multiple segmented top plates divided along the rotation axis of the threshing cylinder. The multiple segmented top plates can be disassembled and assembled laterally. The screen is composed of multiple segmented screens divided along the rotation axis of the threshing cylinder. The sidewalls of the threshing device, which are arranged to extend downward from the lower end of the top plate, are composed of a plurality of segmented walls divided along the direction of the rotation axis. The dividing screen and the dividing wall are divided at the same position as the top plate along the direction of the rotating axis, and can be assembled and disassembled in the same direction as the top plate. In the threshing chamber, the inner surface of the top plate is provided with a plurality of dust feeding valves spaced apart along the direction of the rotation axis, which move the threshed material from one side of the threshing cylinder toward the other side in the direction of the rotation axis. The plurality of dust conveying valves each have a fixed dust conveying valve portion and a movable dust conveying valve portion. The fixed dust conveying valve portion is mounted on the top plate in a fixed position. The movable dust conveying valve portion is adjacent to the fixed dust conveying valve portion in the circumferential direction and can be adjusted by swinging to change the conveying angle. The plurality of segmented top plates, along the circumference of the threshing cylinder, can be divided at the transverse middle section into a top plate portion located on the side of the fixed dust valve and a top plate portion located on the side of the movable dust valve, and are supported in a manner that allows for lateral disassembly and assembly. The fixed dust supply valve portion includes: a first fixed dust supply valve portion disposed on the inner surface of the top plate portion on one side, and a second fixed dust supply valve portion extending towards the movable dust supply valve portion closer to the segmented position than the segmented position. The first fixed dust valve portion is fixed to the top plate portion on one side, and the second fixed dust valve portion and the movable dust valve portion are fixed to the top plate portion on the other side.

2. The combine harvester according to claim 1, wherein, At the dividing boundary between the plurality of dividing top plates, a support frame is provided extending from one lateral side of the threshing device to the other side. The plurality of segmented top plates are supported by the support frame.

3. The combine harvester according to claim 2, wherein, The other top plate portion is supported by the support frame in a manner that allows it to be detached from one lateral side. The top plate on one side is supported by a guide rail provided on the support frame in a manner that allows for insertion and removal in the lateral direction.

4. The combine harvester according to claim 2 or 3, wherein, Above the threshing device is a grain bin for storing the grains threshed by the threshing device and an engine as a power source. The threshing device has upper frames on both lateral sides, which span the upper parts of the plurality of support frames and extend along the direction of the rotation axis. The grain bin and the engine are supported by the upper frames on the left and right sides.

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