Combine harvester

Abstract

A combine harvester capable of causing a screening air to act on threshed material that has fallen from a threshing section, and capable of improving the processing capacity of a screening section. The combine harvester is provided with a threshing section (7) that performs a threshing process on crops, and a swing screening device (43) that screens the threshed material that has been threshed by the threshing section, wherein the combine harvester is provided with a grain elevator (47) that blows screening air toward the swing screening device, and a sub grain elevator (71) that is provided at a position higher than the grain elevator, and the swing screening device is provided with a coarse screen (120) that screens the threshed material, a grain screen (130) that is provided below the coarse screen, an upper feed tray (111) that is provided at a front portion of the swing screening device, a middle feed tray (112) that is provided below the upper feed tray and at a position in front of the coarse screen, and a lower feed tray (113) that is provided between the coarse screen and the grain screen.

Description

Technical Field

[0001] The present invention relates to a combine harvester having a oscillating screening device for screening grains threshed by the threshing section. Background Technology

[0002] Combine harvesters include those with the following structure: a conveying device transports crop cut by the harvesting section to the threshing section; the threshed grains (threshed product) are then screened by a screening section located below the threshing section. The screening section has a oscillating screening device that screens the grains by oscillation. As a screening structure, the oscillating screening device includes: a coarse screen having multiple blades; and a grain screen located below the coarse screen. Additionally, the screening section includes a winnowing fan, a fan, and other structures that generate screening air for the air-driven screening effect.

[0003] Regarding the structure of the screening section, Patent Document 1 describes the following structure: a screening component, which is a mesh-like component similar to the grain screen, is provided on the upstream side of the conveying direction of the threshed material in the space between the coarse screen and the grain screen. An upper feed plate (grain plate) is provided in front of the coarse screen and a lower feed plate (grain plate) is provided on the lower side of the front end of the coarse screen. Screening air from the winnowing machine is sent out to the position between the upper and lower feed plates.

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: Japanese Patent No. 7162519 Summary of the Invention

[0007] According to the structure disclosed in Patent Document 1, although the screening air from the winnowing machine can be used to spread the threshed material falling from the threshing section onto the lower feed tray, sufficient screening effect cannot be obtained. Therefore, the following problem exists: if the processing volume of the threshing section increases, the processing time is extended, resulting in insufficient processing capacity.

[0008] The present invention was made in view of the above-mentioned problems, and its object is to provide a combine harvester that enables the screening air to act on the threshed material falling from the threshing section, thereby improving the processing capacity of the screening section.

[0009] The combine harvester of the present invention comprises: a threshing section for threshing crops; and a oscillating screening device for screening the threshed material after threshing by the threshing section. The combine harvester further comprises: a winnowing machine for blowing screening air onto the oscillating screening device; and a secondary winnowing machine positioned higher than the winnowing machine and blowing screening air onto the oscillating screening device. The oscillating screening device comprises: a coarse screen for screening the threshed material; a grain screen positioned below the coarse screen; an upper feed pan positioned in front of the oscillating screening device; a middle feed pan positioned below the upper feed pan and in front of the coarse screen; and a lower feed pan positioned between the coarse screen and the grain screen.

[0010] The combine harvester involved in this invention is based on the combine harvester, wherein the winnowing machine is configured to blow screening air onto the grain sieve, and the auxiliary winnowing machine is configured to blow screening air onto the upper feed pan, between the upper feed pan and the middle feed pan, between the coarse sieve and the lower feed pan, and between the lower feed pan and the grain sieve.

[0011] The combine harvester involved in this invention is based on the combine harvester, and a sieve section with multiple screen lines arranged in parallel is provided on the rear side of the upper feed plate, and the middle feed plate is arranged below the sieve section.

[0012] The combine harvester involved in this invention is based on the combine harvester in which the middle feed plate and the lower feed plate are configured such that at least a portion of them overlap each other when viewed from above.

[0013] The combine harvester involved in this invention is based on the combine harvester, and a guiding component is provided on the upper feeding plate to guide the grains to the center side in the left-right direction.

[0014] The combine harvester involved in this invention is based on the combine harvester, and the oscillating screening device has a support component that supports the grain screen on the lower feeding tray.

[0015] The combine harvester involved in this invention, based on the combine harvester, has a rectifier plate portion that functions to screen the airflow in the supporting component.

[0016] The combine harvester involved in this invention, based on the combine harvester, has an oscillating screening device with a wind direction component, which is disposed below the lower feeding plate and together with the lower feeding plate forms an air path for screening air from the auxiliary winnowing machine.

[0017] Invention Effects

[0018] According to the present invention, the screening air can be made to act on the threshed material falling from the threshing section, thereby improving the processing capacity of the screening section. Attached Figure Description

[0019] Figure 1 This is a left view of a combine harvester according to one embodiment of the present invention.

[0020] Figure 2 This is a right view of a combine harvester according to one embodiment of the present invention.

[0021] Figure 3 This is a top view of a combine harvester according to one embodiment of the present invention.

[0022] Figure 4 This is a diagram illustrating the power transmission structure of a combine harvester according to an embodiment of the present invention.

[0023] Figure 5 This is a left sectional view showing the structure of the threshing section and the screening section according to an embodiment of the present invention.

[0024] Figure 6 This is a left sectional view showing the structure of the screening section according to an embodiment of the present invention.

[0025] Figure 7 This is a top sectional view showing the structure of the sieve section provided on the upper feed tray according to an embodiment of the present invention.

[0026] Figure 8 This is a top cross-sectional view showing a grain sieve and its surrounding structure according to an embodiment of the present invention.

[0027] Figure 9 This is a left sectional view showing the support structure of the front part of a grain sieve according to an embodiment of the present invention.

[0028] Figure 10 This is a left sectional view showing the support structure of the rear part of a grain sieve according to an embodiment of the present invention.

[0029] Figure 11 yes Figure 9 AA-direction sectional view.

[0030] Figure 12 This is a left sectional view showing the structure of the screening section according to an embodiment of the present invention and the flow of the screening air.

[0031] Figure 13 This is a left sectional view showing the connection structure of the sieve section relative to the upper feed tray according to an embodiment of the present invention.

[0032] Explanation of reference numerals in the attached figures

[0033] 1: Combine harvester; 7: Threshing section; 8: Screening section; 43: Oscillating screening device; 47: Winnowing machine; 71: Auxiliary winnowing machine; 111: Upper feeding plate; 112: Middle feeding plate; 113: Lower feeding plate; 114: Guide plate (guiding component); 119: Second air direction plate (air direction component); 120: Coarse screen; 130: Grain screen; 200: Support bracket (support component); 202: Side section (rectifier plate section); 263: Lower air passage (air passage); 390: Screen section; 391: Screening line section. Detailed Implementation

[0034] use Figures 1 to 5 The overall structure of the combine harvester 1 according to this embodiment will be described. Furthermore, in the following description, the left side (…) will be positioned facing the front of the combine harvester 1. Figure 3 (lower side) and right side ( Figure 3 The upper side of the machine is set as the left and right sides of the combine harvester 1.

[0035] like Figure 1 and Figure 2 As shown, the combine harvester 1 according to this embodiment is a common type of combine harvester capable of harrowing harvested crops (rice, wheat, soybeans, corn, etc.) from a field into the machine body, threshing / screening / storing the grains, and appropriately outputting them to the outside of the harvester. The combine harvester 1 includes: a traveling body 2, which is capable of autonomous movement; and a cutting section 3, which is provided at the front end of the traveling body 2. The cutting section 3 is configured as a cutting device that cuts the uncut ears of rice, wheat, etc. while taking them in, and is mounted on the traveling body 2 in a lifting and lowering manner.

[0036] The traveling body 2 includes a traveling section 4 configured as a tracked traveling device with a pair of left and right track sections 5, 5. A body frame 6 is erected between the left and right track sections 5, 5. Each track section 5 has: multiple rotating bodies, which include a drive sprocket 5a disposed at its front end; and a track 5c wound around the rotating body. The drive sprocket 5a is driven to rotate by receiving power from the engine 25 of the combine harvester 1.

[0037] On the left side of the machine frame 6 are provided: a threshing section 7, which threshes the ears of grain cut and supplied by the harvesting section 3; and a screening section 8, which screens the grains threshed by the threshing section 7. The threshing section 7 and the screening section 8 are arranged behind the harvesting section 3 in such a way that the threshing section 7 is on the upper layer and the screening section 8 is on the lower layer.

[0038] On the frame 6, and on the right side of the threshing section 7 and the screening section 8, there is a grain storage section 9 having a grain bin 10 for storing the grains (fine grains) screened by the screening section 8. Inside the grain bin 10, there is a lower discharge conveyor 11 that conveys the stored grains toward the discharge outlet of the grain bin 10 (see reference). Figure 4 The longitudinal conveyor 12 is erected vertically in a manner connected to the discharge port of the grain bin 10. A grain discharge conveyor 13 is connected to the upper end of the longitudinal conveyor 12. The grain discharge conveyor 13 is configured to rotate horizontally and swing up and down about a horizontal axis. The grains in the grain bin 10 are transported by the above-mentioned conveyor and discharged from the rice inlet 14 located at the end of the grain discharge conveyor 13 into the cargo box of a truck, container, etc.

[0039] On the frame 6, in front of the grain storage section 9, specifically at the front right side of the frame 6, is a driver's compartment 15 for the operator. The driver's compartment 15 is covered by a cab 16. The driver's compartment 15 includes a driver's seat 17, a steering wheel 18 positioned in front of the driver's seat 17, a main gear shift lever 19, a secondary gear shift lever, a working clutch lever, and other operating components (see reference). Figure 2 The working clutch lever is used for engaging the threshing clutch 57 and the cutting clutch 75 (see reference). Figure 4 ) Operational components used for engaging and disengaging operations.

[0040] An engine 25, serving as the drive source, is located below the driver's compartment 15 on the fuselage frame 6. The engine 25 is positioned in the front right side space of the fuselage frame 6, utilizing the space below the driver's compartment 15. The engine 25 is, for example, a diesel engine.

[0041] The harvesting section 3 will be described below. The harvesting section 3 includes a feeder 30 as a conveying device, a platform 31 as a grain harvesting table, a cutter device 32, a pair of left and right dividers 33, 33, and a harrowing reel 34.

[0042] The feeder 30 is a feeding and conveying device that transports the stalks cut by the cutting section 3 to the threshing section 7. The feeder 30 includes: a feeding chamber 35 as a housing; and a conveyor 36 for transporting the stalks (see reference). Figure 4 The feeder 30 is located within the feeding chamber 35. The feeding chamber 35 is configured as an approximately rectangular cylinder when viewed from above, with its length as the longitudinal direction. The feeder 30 is located on the left side of the driver's cab 16 (see reference). Figure 3 ), and is configured such that the rear end opening of the feeding chamber 35 is connected to the threshing port 7a on the front side of the threshing section 7 (see reference). Figure 1 ).

[0043] Platform 31 is configured as a horizontally elongated bucket and is connected to the front side of feeder 30 via a connection to the front opening of feed chamber 35. A rake-gathering auger (platform-type auger) 37 is installed inside platform 31. The rake-gathering auger 37 is designed to rotate with its axis of rotation in the left-right direction.

[0044] The cutting device 32 is located at the lower front edge of the platform 31 and is configured as a pusher. A pair of left and right tillers 33, 33 are positioned to protrude forward from the left and right sides of the front of the platform 31. The harrowing reel 34 is a reel with serrated beams and is located above and in front of the harrowing auger 37. The harrowing reel 34 is pivotally supported at its base between the ends of a pair of left and right reel support arms 34a, 34a on the platform 31, allowing it to rotate in the left-right direction. While rotating, the harrowing reel 34 continuously acts on the pod-bearing portion of the ear stalk, harrowing the pod-bearing portion towards the harrowing auger 37. The operation of each part of the harvesting section 3 is powered by the engine 25, which is transmitted via various transmission mechanisms.

[0045] A front rotating member 26 is provided at the rear of the feeder 30 to feed the stalks conveyed by the conveyor 36 into the threshing port 7a. The front rotating member 26 is located between the end of the conveyor 36 and the threshing port 7a. The front rotating member 26 has: a roughly cylindrical rotating body 27, referred to as a threshing drum, etc.; and a front rotating shaft 28 with the left-right direction as the axis (see reference). Figure 4 The stalks conveyed by the feeder 30 are fed from the end of the conveyor 36 into the threshing chamber 7b of the threshing section 7 through the threshing port 7a via the front rotating member 26.

[0046] The conveyor 36 inside the feeding chamber 35 has a cutting section input shaft (feeding chamber conveyor shaft) 38 located at the front of the threshing section 7 and axially in the left-right direction as a drive shaft to support its conveying end side. The rear end of the feeder 30 is rotatably supported on the traveling body 2 side with the cutting section input shaft 38 as the rotation axis. In addition, a lifting cylinder 39, which is a hydraulic cylinder, is sandwiched between the lower surface of the feeding chamber 35 and the machine frame 6 (see reference). Figure 1 ).

[0047] The cutting unit 3 is configured to perform lifting operations by rotating the feeder 30 relative to the traveling body 2, which accompanies the extension and retraction of the lifting cylinder 39. The lifting operation of the cutting unit 3 allows for height adjustment by raising and lowering the cutting unit 3 with the input shaft 38 as the rotation pivot. The lifting operation of the cutting unit 3 is operated using a designated operating unit provided in the driving unit 15.

[0048] The threshing section 7 and the screening section 8 will be described below. The threshing section 7 includes: a threshing cylinder 40 disposed within a threshing chamber 7b that opens forward through a threshing port 7a; and a receiving screen 42 disposed below the threshing cylinder 40. The threshing chamber 7b is formed by a frame 21 disposed on the machine body frame 6.

[0049] The threshing cylinder 40 is supported by a threshing cylinder shaft 41 with the rear-to-rear direction as its axial direction, enabling it to rotate. For example... Figure 5 As shown, the threshing cylinder 40 has a cylindrical main body with a threshing cylinder shaft 41 along a central axis, and a plurality of threshing cylinder bars 40a protruding from the outer peripheral surface of the main body. On the upper side of the threshing cylinder 40, a plurality of dust valves 22 for adjusting the conveying speed (retention time) of the threshed material within the threshing chamber 7b are configured to be angle-adjustable relative to the top surface 7c of the threshing chamber 7b. A receiving mesh 42 allows the grains to leak downwards and is configured to run along the outer peripheral surface of the lower part of the threshing cylinder 40.

[0050] The screening section 8 includes: a oscillating screening device 43 as an oscillating screening section, which is disposed below the threshing section 7 across the receiving net 42; an oscillating mechanism 44, which includes an oscillating shaft 44a; a first-grade product conveyor 45; a second-grade product conveyor 46; and a winnowing machine 47 (see reference). Figure 5 The oscillating mechanism 44 uses rotational power from the drive source to rotate the oscillating shaft 44a, causing the oscillating screening device 43 to oscillate back and forth in a predetermined direction, which is the front-to-back direction, when viewed from above. An auxiliary winnowing machine 71, serving as a primary fan, is located above and in front of the winnowing machine 47. Furthermore, a secondary fan 72 is located behind the winnowing machine 47, between the first-grade conveyor 45 and the second-grade conveyor 46 in the front-to-back direction.

[0051] As a structure for gravity screening, the oscillating screening device 43 includes: an upper feed plate 111; a coarse screen 120, which is disposed behind the upper feed plate 111 and performs coarse screening by adjusting the downward leakage amount (leakage amount) of the grains; a lower feed plate 113, which is disposed below the coarse screen 120; and a grain screen 130, which is disposed below the coarse screen 120.

[0052] A first-grade conveyor 45 is disposed within a first-grade guide trough 45b that extends along the width of the machine body in a manner that allows first-grade grains (first-grade product) to collect. A second-grade conveyor 46 is disposed behind the first-grade conveyor 45 within a second-grade guide trough 46b that extends along the width of the machine body in a manner that allows second-grade grains (second-grade product) to collect. A winnowing machine 47 blows screening air onto a oscillating screening device 43, passing from the lower front to the upper rear.

[0053] A reduction conveyor 48 is provided on the right side of the machine body where the threshing section 7 and the screening section 8 are located (see reference). Figure 4The reduction conveyor 48 is positioned so that its lower end is located near and connected to the second-grade conveyor 46, and its upper end is located near the front end of the threshing cylinder 40, extending in an inclined manner with a higher front and lower rear. A winnowing conveyor 49 extending vertically is located to the right of the reduction conveyor 48. The winnowing conveyor 49 conveys the first-grade grain, transported by the first-grade conveyor 45, into the grain bin 10.

[0054] The combine harvester 1, equipped with the above structure, raises the harvesting section 3 to the desired height (the harvesting height of the ear stalk of the crop) relative to the ground by the lifting action of the feeder 30 centered on the harvesting section input shaft 38 (support shaft) in the field, changing from a non-operating state to an operating state, and then travels using the traveling body 2 in this state. Thus, the combine harvester 1 divides the crop into harvestable and non-harvested sections using the left and right tillers 33, 33, and while using the harrowing reel 34 to harrow the pod-bearing portion of the ear stalk of the harvestable section, it uses the cutting device 32 to cut the pod-bearing portion of the ear stalk.

[0055] The rotary-driven rake auger 37 rakes the pod-bearing parts of the ear stalks cut at the desired cutting position into the platform 31. The rake auger 37 then conveys the stalks, causing them to gather near the intake of the feeding chamber 35 within the platform 31 and be drawn into the feeding chamber 35. The conveyor 36 then carries the ear stalks from the feeding chamber 35 through it and, via the front rotating member 26, feeds them into the threshing port 7a and into the threshing section 7.

[0056] The threshing section 7 is used to thresh the pod-bearing parts of the ears of grain supplied to it. Specifically, the ears of grain supplied to the threshing section 7 are conveyed backward by the rotating threshing cylinder 40 while threshing mainly takes place between the threshing cylinder 40 and the receiving net 42. Grains and other threshed materials smaller than the mesh size of the receiving net 42 leak downward from the receiving net 42. Straw fragments and other materials that do not leak downward from the receiving net 42 are discharged through the dust outlet 8a (see reference 8a) located at the rear of the screening section 8 by the conveying action of the threshing cylinder 40. Figure 5 It is discharged into the fields.

[0057] On the other hand, the screening section 8 is used to screen the grains that have been threshed in the threshing section 7 and have leaked downward from the receiving net 42. Specifically, the threshed material that has been threshed by the threshing cylinder 40 and has leaked downward from the receiving net 42 is screened by the gravity screening action of the oscillating screening device 43 and the wind screening action of the winnowing machine 47 into fine grains (first grade), a mixture of grains with branches and stalks and straw (second grade), and straw scraps, etc., and then removed.

[0058] The first-grade grains (first-grade) that have fallen from the oscillating screening device 43 after being screened by the screening section 8 are conveyed to the grain bin 10 using the first-grade conveyor 45 and the winnowing conveyor 49 connected thereto. The second-grade grains are returned to the threshing start side of the threshing cylinder 40 by the second-grade conveyor 46 and the reduction conveyor 48 connected thereto for threshing again. Straw scraps and other debris are discharged into the field through the dust discharge port 8a located at the rear of the screening section 8.

[0059] Next, using Figure 4 The power transmission structure of the combine harvester 1 according to this embodiment will be described. The combine harvester 1 uses the rotational power of the engine 25 to drive the cutting section 3, the traveling section 4, the threshing section 7, the screening section 8, and the grain storage section 9.

[0060] The engine 25 has a first output shaft 25a and a second output shaft 25b. The rotational power of the first output shaft 25a is transmitted to the traveling section 4, the threshing section 7, the screening section 8, and the cutting section 3. The rotational power of the second output shaft 25b is transmitted to the grain storage section 9. In addition, the engine 25 has a work pump shaft that drives a booster pump 54 that operates the lifting cylinder 39, etc.

[0061] Regarding the power transmission system for the traveling section 4, the rotational power of the first output shaft 25a is transmitted to the HST input shaft 52 via the first belt drive mechanism 51 and input to the transmission 53, which includes a traveling HST and a turning HST. Here, "HST" refers to a hydraulic continuously variable transmission (CVT) that uses a hydraulic motor to convert the hydraulic pressure generated by driving a hydraulic pump back into rotational force. The driving force of the transmission 53 drives the drive sprocket 5a of the track section 5 constituting the traveling section 4 to rotate.

[0062] Regarding the power transmission system for the threshing section 7, the rotational power of the first output shaft 25a is transmitted to the threshing section input shaft 56 via a second belt drive mechanism 55. A threshing clutch 57 is provided in the second belt drive mechanism 55 to transmit the rotational power of the first output shaft 25a to the threshing section input shaft 56 intermittently.

[0063] The rotational power of the threshing section input shaft 56 is transmitted to the threshing cylinder input shaft 59 via a third belt drive mechanism 58. The rotational power of the threshing cylinder input shaft 59 is transmitted to the threshing cylinder shaft 41 via a threshing speed change device 60, using a first bevel gear 115 fixedly mounted on the threshing cylinder input shaft 59 and a second bevel gear 116 fixedly mounted on the threshing cylinder shaft 41. Regarding the rotational power input from the threshing cylinder input shaft 59 to the threshing cylinder shaft 41, the threshing speed change device 60 provides, for example, two speed levels: high speed and low speed.

[0064] According to this structure, the driving force of the engine 25 is transmitted to the threshing section 7. Moreover, the threshing clutch 57 is engaged / disengaged by operating the working clutch lever provided on the driver unit 15, thereby switching the power transmission to the threshing section 7 on and off.

[0065] Regarding the power transmission system for the screening section 8, the threshing section input shaft 56 has a support shaft for the winnowing machine 47. The rotational power of the threshing section input shaft 56 is transmitted to the pulley rotating body 63 supported on the intermediate threshing shaft 62 via a fourth belt drive mechanism 61. The rotational power of the pulley rotating body 63 is transmitted to the auxiliary winnowing machine 71 and the winnowing machine 47 via a predetermined transmission mechanism. Furthermore, the rotational power of the threshing section input shaft 56 is transmitted to the rotating shafts of the first-grade conveyor 45, the secondary fan 72, and the second-grade conveyor 46 via a predetermined transmission mechanism.

[0066] The rotational power of the first-grade conveyor 45 is transmitted to the winnowing conveyor 49 using a prescribed transmission mechanism. The rotational power of the second-grade conveyor 46 is transmitted to the swing shaft 44a of the swing mechanism 44 using a fifth belt drive mechanism 64. The rotational power of the second-grade conveyor 46 is transmitted to the reduction conveyor 48 by means of a bevel gear.

[0067] Regarding the power transmission system for the cutting section 3, the rotational power of the pulley rotating body 63 is transmitted forward to the rotating shaft 28 via a sixth belt drive mechanism 73. A cutting clutch 75 is provided in the sixth belt drive mechanism 73 to transmit the rotational power of the pulley rotating body 63 forward to the rotating shaft 28 intermittently. The rotational power of the rotating shaft 28 is transmitted to the cutting section input shaft 38 via a first chain drive mechanism 65. The rotation of the cutting section input shaft 38 drives the conveyor 36 within the feeding chamber 35 to operate.

[0068] The rotational power of the cutting section input shaft 38 is transmitted to the PF (platform) drive shaft 67 via the second chain drive mechanism 66. The rotational power of the PF drive shaft 67 is transmitted to the PF auger shaft 37a, which rotates the harrowing auger 37, via the third chain drive mechanism 68. Furthermore, the rotational power of the PF drive shaft 67 is transmitted to the cutter drive shaft 32a, which drives the cutter device 32, via the seventh belt drive mechanism 69. Additionally, the rotational power of the PF drive shaft 67 is transmitted to the reel shaft 34b, which rotates the harrowing reel 34, via the fourth chain drive mechanism 76, which includes the reel sub-shaft 70.

[0069] According to this structure, the driving force of the engine 25 is transmitted to the cutting unit 3. Moreover, the cutting clutch 75 is engaged / disengaged by operating the working clutch lever provided on the driver unit 15 to switch the power transmission to the cutting unit 3 on and off.

[0070] Regarding the power transmission system for the grain storage section 9, the rotational power of the second output shaft 25b is transmitted to the lower discharge conveyor 11 via a power transmission mechanism including the intermediate shaft 77 of the grain bin, and the rotational power of the lower discharge conveyor 11 is transmitted to the longitudinal conveyor 12 via a bevel gear. The rotational power of the longitudinal conveyor 12 is transmitted to the grain discharge conveyor 13 via a predetermined transmission mechanism. Furthermore, as a structure that receives and drives the rotational power of the intermediate shaft 77 of the grain bin, the grain storage section 9 includes an exhaust fan 78 and a compressor 79.

[0071] As described above, the combine harvester 1 according to this embodiment includes: a threshing section 7 for threshing crops; and a oscillating screening device 43 for screening the threshed material after threshing by the threshing section 7. Furthermore, the combine harvester 1 includes in its screening section 8: a winnowing machine 47 that blows screening air onto the oscillating screening device 43; and a secondary winnowing machine 71, which is positioned higher than the winnowing machine 47 and blows screening air onto the oscillating screening device 43. Moreover, the oscillating screening device 43 includes: a coarse screen 120 for screening the threshed material; a grain screen 130, which is positioned below the coarse screen 120 and screens the threshed material after screening by the coarse screen 120; and multiple feed trays (111, 112, 113).

[0072] In addition to the upper feed plate 111 and the lower feed plate 113, the oscillating screening device 43 also has a middle feed plate 112, forming a three-layer structure of upper, middle, and lower feed plates. That is, the oscillating screening device 43 has: an upper feed plate 111, which is located at the front of the oscillating screening device 43; a middle feed plate 112, which is located below the upper feed plate 111 and in front of the coarse screen 120; and a lower feed plate 113, which is located between the coarse screen 120 and the grain screen 130 and receives the threshed material that leaks downward from the coarse screen 120.

[0073] Thus, the combine harvester 1 is configured as a threshing device equipped with the following components: a winnowing machine 47 and an auxiliary winnowing machine 71, which blow screening air onto a oscillating screening device 43 that screens the threshed material (hereinafter also simply referred to as "processed material") that leaks downward from the receiving screen 42 of the threshing chamber 7b; a grain sieve 130, which allows first-grade grains to leak downward from the oscillating screening device 43; and upper / middle / lower feed trays (111, 112, 113). Hereinafter, using... Figures 5 to 13 The structure of the screening unit 8 will be explained.

[0074] The oscillating screening device 43 uses a frame 140, which is approximately rectangular in shape with the longitudinal direction as its length when viewed from above, as the main body for oscillating, thus forming an oscillating screening disc that oscillates in the longitudinal direction when viewed from above. The frame 140 has: left and right side plates 141; a front plate 142 disposed between the front ends of the left and right side plates 141; and a rear plate 143 disposed between the rear ends of the left and right side plates 141, and is formed into an approximately rectangular frame shape by the aforementioned plate portions.

[0075] Side plate 141 is a long, strip-shaped plate component with its length along the front-to-back direction, and has a shape in which the upper edge is horizontal and the lower edge at the front is inclined, with the front higher than the back, when viewed from the side. Side plate 141 has a vertical surface with its thickness along the left-to-right direction, and has an inner surface 141a and an outer surface 141b. Various structures for screening constituting the oscillating screening device 43 are provided between the left and right side plates 141.

[0076] like Figure 8 As shown, the oscillating screening device 43 is disposed between the left and right side plates 139 disposed from the threshing section 7 to the screening section 8. Moreover, the oscillating screening device 43 is configured such that the left and right side plates 141 of the frame 140 are formed parallel to the side plates 139 respectively, and are located near the left and right inner sides of the side plates 139.

[0077] The frame 140 is connected to the swing mechanism 44 on the lower side of the rear end. The swing mechanism 44 causes the frame 140 and the various screening structures supported on the frame 140 to swing together.

[0078] An upper feeding tray 111 is provided at the front end between the left and right side plates 141. The upper feeding tray 111 catches the processed material falling from the receiving net 42, and moves it backward while leveling it as the swinging screening device 43 swings.

[0079] The upper feed tray 111 has a main body 111a consisting of a plate-shaped member mounted between the left and right side plates 141. The main body 111a has a horizontal or nearly horizontal central portion that constitutes most of it. The plate-shaped member constituting the main body 111a is configured such that mounting pieces 111c, which are formed by bending at right angles at their left and right edges, are fixed to the left and right side plates 141, 141 by bolts, pins or other fasteners that pass through the mounting pieces 111c, or by welding or the like, with the mounting pieces 111c extending along the inner surface 141a of the left and right side plates 141.

[0080] A guide plate 114 is provided on the main body 111a of the upper feed tray 111 as a guide member to guide the grains towards the center in the left-right direction. The guide plate 114 is formed as follows: one facet 114a of a long strip with an L-shaped cross-section is fixed to the main body 111a at two locations, front and back, by bolts 117, thereby making the other facet 114b have a rectangular shape with the front-back direction as the length when viewed from the side and is set vertically relative to the main body 111a. The bolts 117 are screwed into a nut provided on the lower side of the main body 111a.

[0081] The guide plate 114 is tilted in the length direction relative to the front-to-back direction when viewed from above, so that it extends from the front to the rear and from the left and right sides outwards towards the inside (see reference). Figure 7 In this embodiment, the guide plates 114 are arranged at three locations with a symmetrical slope, two on the right and one on the left. Furthermore, the number and tilt angle of the guide plates 114 arranged on the upper feed tray 111 are not limited to this embodiment. Additionally, as a guiding member, it is sufficient to apply a guiding action to the grains on the main body 111a of the upper feed tray 111 in a left-right direction towards the center; its shape is not limited.

[0082] A lower feed plate 113 is provided below the upper feed plate 111 and below the front of the coarse screen 120. The lower feed plate 113 is a bent plate-shaped component mounted between the left and right side plates 141. Plate-shaped mounting portions 113c for fixing the lower feed plate 113 to the left and right side plates 141 are bent at right angles at the left and right edges of the lower feed plate 113. The lower feed plate 113 is fixed to the left and right side plates 141 by bolts, pins or other fasteners that pass through the mounting portions 113c, or by welding, with the left and right mounting portions 113c respectively along the inner side surface 141a of the side plates 141.

[0083] The lower feed tray 113 includes: a feed tray main body 113a; a forward inclined portion 113b disposed on the front side of the feed tray main body 113a; and a rear inclined portion 113d disposed on the rear side of the feed tray main body 113a. The feed tray main body 113a is a horizontal or nearly horizontal portion and constitutes a substantially integral part of the lower feed tray 113 except for the front and rear ends. The forward inclined portion 113b is inclined in a rearward-lower-frontward manner and forms an obtuse angle together with the feed tray main body 113a. The rear inclined portion 113d forms an obtuse angle together with the feed tray main body 113a.

[0084] The lower feed pan 113 positions the main body 113a below the front of the coarse screen 120. The main body 113a is at approximately the same height as the upper end of the winnowing machine 47 in the vertical direction. The rearwardly inclined portion 113d forms the rear end of the lower feed pan 113 and is formed as an inclined portion that slopes slightly backwards from the rear of the main body 113a. The lower feed pan 113 is positioned further rearward than the upper feed pan 111 in the longitudinal direction.

[0085] A middle feed plate 112 is provided at a height between the upper feed plate 111 and the lower feed plate 113 in the vertical direction. The middle feed plate 112 is a bent plate-shaped component mounted between the left and right side plates 141. Plate-shaped mounting portions 112c for fixing the middle feed plate 112 to the left and right side plates 141 are bent at right angles on the left and right edges of the middle feed plate 112. The middle feed plate 112 is fixed to the left and right side plates 141 by bolts, pins or other fasteners that pass through the mounting portions 112c, or by welding, with the left and right mounting portions 112c respectively along the inner side surface 141a of the side plates 141.

[0086] The central feed tray 112, as a plate-like portion forming a bent shape when viewed from the side, has, sequentially from front to rear, a forward inclined portion 112a, a middle inclined portion 112b, and a rear horizontal portion 112d. The forward inclined portion 112a forms the front end of the central feed tray 112 and is inclined in a rear-low, front-high manner. The middle inclined portion 112b forms the front portion of the central feed tray 112 and is inclined in a rear-high, front-low manner, forming an obtuse angle together with the forward inclined portion 112a. The rear horizontal portion 112d forms the rear portion of the central feed tray 112 and is horizontal, forming an obtuse angle together with the middle inclined portion 112b.

[0087] The middle feed plate 112 is positioned such that the forward inclined portion 112a and the intermediate inclined portion 112b are located below the rear portion of the upper feed plate 111. The middle feed plate 112 is positioned vertically within the outer diameter of the auxiliary winnowing machine 71. Furthermore, the middle feed plate 112 is positioned vertically within the mounting range of the coarse screen 120. The middle feed plate 112 is positioned in front of the front end of the coarse screen 120, and its rear end (the rear end of the mounting plate 112c) is located directly in front of (near the front side) the upper end of the coarse screen blade 121, which is located at the front end.

[0088] A first airflow guide plate 118 is provided below the central feed pan 112 to control the screening air from the auxiliary winnowing machine 71. The first airflow guide plate 118 is a plate-shaped component mounted between the left and right side plates 141. Plate-shaped mounting portions 118c for fixing the first airflow guide plate 118 to the left and right side plates 141 are formed at right angles on the left and right edges of the first airflow guide plate 118. The first airflow guide plate 118 is fixed to the left and right side plates 141 by bolts, pins or other fasteners that pass through the mounting portions 118c, or by welding, with the left and right mounting portions 118c respectively along the inner side surface 141a of the side plates 141.

[0089] The first wind vane 118 is configured such that, when viewed from the side, the edge of the side plate 141 slopes downwards from the front and upwards from the back. A forward-sloping facet 118a, which slopes downwards from the front and upwards from the back along the lower front side of the side plate 141, is formed at the front end of the first wind vane 118 in a manner that forms an obtuse angle with the main body of the first wind vane 118 when viewed from the side.

[0090] The first air guide plate 118 is positioned such that its front end is located approximately at the center of the upper feed tray 111 in the front-to-back direction, and its rear end is located at the front inclined surface 113b of the lower feed tray 113. The rear end of the first air guide plate 118 is positioned to overlap with the front end of the lower feed tray 113 when viewed from above. Furthermore, the first air guide plate 118 is positioned such that its upper end is at the lower height of the auxiliary winnowing machine 71 in the vertical direction, and its lower end is located further below the lower feed tray 113.

[0091] A second wind vane 119, serving as a wind direction component for sieving airflow from the auxiliary winnowing machine 71, is provided on the rear side of the first wind vane 118 in a continuous manner with the first wind vane 118. The second wind vane 119 is a plate-shaped component mounted between the left and right side plates 141. The second wind vane 119 is a horizontal or nearly horizontal portion, positioned along the lower edge of the left and right side plates 141 when viewed from the side. The second wind vane 119 is positioned near the bottom of the lower feed tray 113, parallel to the feed tray body 113a of the lower feed tray 113. The second wind vane 119 is positioned in the front-to-back direction within approximately the same area as the feed tray body 113a.

[0092] Plate-shaped mounting portions 119c for fixing the second wind vane 119 to the left and right side plates 141, 141 are formed at right angles on the left and right edges of the second wind vane 119. The second wind vane 119 is fixed to the left and right side plates 141, 141 by bolts, pins or other fasteners that pass through the mounting portions 119c, or by welding, with the left and right mounting portions 119c respectively along the inner side surface 141a of the side plate 141.

[0093] The second wind vane 119 connects its front end with the rear end of the first wind vane 118, which is lower at the rear and higher at the front. The first wind vane 118 and the second wind vane 119 form a curved wind vane face with their respective upper surfaces. The first wind vane 118 and the second wind vane 119 form part of the bottom surface of the frame 140 on the lower front side of the frame 140 by being mounted between the left and right side plates 141.

[0094] A coarse screen 120 is provided at a height between the upper feed plate 111 and the lower feed plate 113 in the vertical direction. The coarse screen 120 is a structure used to coarsely screen the processed material and adjust the downward leakage of the processed material, and has coarse screen blades 121 as multiple blades.

[0095] The coarse screen blade 121 is a narrow rectangular plate-shaped component with its length in the left-right direction, and is mounted between the left and right side plates 141 with an inclined orientation that is lower in the front and higher in the back. Multiple (e.g., more than twenty) coarse screen blades 121 constituting the coarse screen 120 are arranged in a parallel configuration with predetermined intervals in the front-back direction. The coarse screen 120 is configured to allow adjustment of the inclination angle of the multiple coarse screen blades 121.

[0096] The coarse screen 120 is positioned such that the front coarse screen blades 121 are located near the front end of the feed pan body 113a of the lower feed pan 113, and the rear coarse screen blades 121 are located further back than the rear end of the grain screen 130. As the oscillating screening device 43 oscillates, the coarse screen 120 performs gravity screening on the materials leaking downwards from the receiving screen 42, the materials conveyed from the upper feed pan 111, the middle feed pan 112, etc., thereby separating the grains from impurities.

[0097] like Figure 6 As shown, a front guide plate 145, with an inclined surface that slopes from the rear of the coarse screen 120 to the lower part of the grain screen 130, is provided towards the first-grade product conveyor 45. The front guide plate 145 is constructed of a metal plate-shaped component and a rubber sag formed from an elastic material such as rubber. The front guide plate 145 guides the threshed material (first-grade product) falling from the grain screen 130 to the first-grade product conveyor 45.

[0098] Two paper walkers 135, a front paper walker 135A and a rear paper walker 135B, are provided behind the coarse screen 120. The two paper walkers 135 are located at the rear or rear end between the left and right side plates 141. The paper walker 135 is composed of a plurality of paper walker components 136 that are spaced apart at predetermined intervals in the left and right direction.

[0099] The document runner component 136 is a plate-shaped component with an alternating concave-convex shape on its upper side, and is configured to have its front end fixed to a support component 137 mounted between the left and right side plates 141. The document runner component 136 of the rear document runner 135B extends rearward, and its front-to-back length is greater than that of the document runner component 136 of the front document runner 135A. The front end of the document runner component 136 of the rear document runner 135B is located below the rear end of the document runner component 136 of the front document runner 135A, and the front and rear document runners 135 are configured to be continuous in the front-to-back direction.

[0100] The threshing machine 135 performs gravity screening on the threshed material conveyed from the coarse screen 120. The threshing machine 135 is configured to allow the secondary products (grains with branches, cut stalks, etc.) that are lighter than the grains in the threshed material to move downstream, and to convey the discharged straw and other materials out of the harvester.

[0101] Below the front and rear paper feeders 135, a rear guide plate section 146 is provided, forming an inclined surface that is lower at the front and higher at the rear towards the second-grade product conveyor 46. The rear guide plate section 146 is composed of a metal plate-shaped component, a rubber sag formed of an elastic material such as rubber, etc. The threshed material falling from the paper feeders 135 is guided by the rear guide plate section 146 to the second-grade product conveyor 46.

[0102] The grain sieve 130 receives the grains threshed by the threshing section 7 and is installed in the oscillating screening device 43 as a sieve section for screening first-grade products. Above the grain sieve 130 is a coarse sieve 120 with multiple coarse sieve blades 121, which further screens the processed material after screening by the coarse sieve 120. The grain sieve 130 is located above the first-grade product conveyor 45 and distributes the processed material to the first-grade product conveyor 45 and the second-grade product conveyor 46.

[0103] like Figure 6 and Figure 8 As shown, the grain sieve 130 is a nearly flat plate-shaped component with a nearly rectangular plate-like shape. The grain sieve 130 has a width dimension (the dimension in the left-right direction) corresponding to the spacing between the left and right side plates 141, 141, and is provided in the left-right direction over a generally integral area covering the left and right side plates 141, 141.

[0104] The grain sieve 130 includes a plate-shaped grain sieve body 161 through which a plurality of holes 163 for screening the processed material are formed. The grain sieve body 161 is a generally flat, porous portion constituting the entirety of the grain sieve 130, which has a rectangular shape, and has an upper surface 161a and a lower surface 161b as a plate surface.

[0105] A plurality of holes 163, serving as through holes, are formed throughout most of the main body 161 of the grain sieve, excluding the front and rear edges. The plurality of holes 163 are arranged in a two-dimensional grid pattern, substantially following the rectangular shape of the grain sieve 130. The grain sieve 130 utilizes the set of holes 163 to allow grains that should be stored in the grain bin 10 to fall off, while leaving impurities other than grains on the grain sieve 130. The holes 163 have a rounded, approximately square or approximately rectangular opening shape. However, the opening shape of the holes 163 is not particularly limited.

[0106] The grain sieve 130 has a leading edge 162 and a trailing edge 164 on the main body 161 of the grain sieve 130, which are non-forming portions of the perforations 163. The leading edge 162 and the trailing edge 164 are plate-shaped portions provided with a substantially constant width throughout the entire width direction (left-right direction) of the grain sieve 130. Longitudinal grids 165 are provided on the lower surface 161b of the middle portion in the width direction of the grain sieve main body 161 at two locations on the left and right sides. The longitudinal grids 165 are straight components in the front-back direction when viewed from above, have an approximately U-shaped cross-sectional shape with the lower side open, and are fixed to the lower surface 161b of the grain sieve main body 161 by welding or the like (see reference). Figure 10 Furthermore, through openings that match the holes 163 are formed at the locations of the longitudinal grilles 165 corresponding to each hole 163.

[0107] The grain sieve 130 is positioned such that its front end is located below the rear end of the feed tray body 113a of the lower feed tray 113. Additionally, the grain sieve 130 is positioned such that its rear end is located near the rear end of the coarse sieve 120.

[0108] A forward-flexed face 166 is formed on the front side of the grain sieve 130 and the main body 161 of the grain sieve, bending downward at a right angle from the front end of the front edge 162 (see reference). Figure 9 Additionally, lateral curved surfaces 167 are formed on the left and right sides of the grain sieve body 161, curving downwards at right angles from the left and right ends of the grain sieve body 161. Furthermore, a rear curved surface 168 is formed on the rear side of the grain sieve body 161, which forms an approximately L-shaped curved portion when viewed from the side (see reference). Figure 10As a portion that forms an approximate L-shape when viewed from the side, the rear-bending face 168 has: a longitudinal face 168a, which bends downward at a right angle from the rear end of the rear edge portion 164 of the grain sieve body portion 161; and a transverse face 168b, which bends backward at a right angle from the lower end of the longitudinal face 168a.

[0109] The support structure of the grain sieve 130 of the oscillating screening device 43 will be described. The grain sieve 130 is supported on the front and rear sides and the left and right sides by a front support 171, a rear support 172, and left and right side supports 173, 174. The grain sieve 130 and its support structure are configured to be symmetrical or approximately symmetrical.

[0110] In the front support portion 171, the grain sieve 130 fixes the front edge portion 162 of the grain sieve body portion 161 to the rear edge portion of the lower feed tray 113 by means of the beam member 180 and the left and right support brackets 200 that serve as support members.

[0111] The beam member 180 is a straight member having approximately the same dimensions as the lower feed tray 113 in the left-right direction, and is configured as a generally integral part extending between the left and right side plates 141, 141. The beam member 180 is a buckled plate-shaped member with a constant cross-sectional shape, and together with the rear edge of the lower feed tray 113, forms an approximately square cylindrical space 181 that opens to the left and right sides (see reference). Figure 9 ).

[0112] like Figure 9 As shown, the beam member 180 has the following facets constituting its cross-sectional shape: a front fixed facet 182, which runs along the lower surface of the feed tray body 113a of the lower feed tray 113; a front side facet 183, which bends downward at an obtuse angle from the rear end of the front fixed facet 182; a bottom facet 184, which bends backward at a right angle from the lower end of the front side facet 183; a rear side facet 185, which bends upward at a right angle from the rear end of the bottom facet 184; and a rear fixed facet 186, which bends backward at a right angle from the upper end of the rear side facet 185 and runs along the lower surface of the rear inclined facet 113d of the lower feed tray 113. In a side cross-sectional view (as a cross-sectional shape), the beam member 180 is formed into an approximately cap-shaped form by the aforementioned facets.

[0113] The beam component 180 is fixed to the lower feed tray 113 by welding or the like, with the front fixed portion 182 and the rear fixed portion 186 respectively fixed to the feed tray main body 113a and the rear inclined portion 113d. A cylindrical space portion 181 is formed by the front side portion 183, the bottom portion 184, the rear side portion 185, the rear edge of the feed tray main body 113a, and the front edge of the rear inclined portion 113d of the beam component 180 fixed to the lower feed tray 113.

[0114] The beam member 180 is provided with threaded members 187 for fixing the support bracket 200. The threaded members 187 are provided at two locations on each support bracket 200 at predetermined intervals in the left-right direction, for a total of four locations. The threaded members 187 are, for example, weld bolts, which penetrate the bottom part 184 of the beam member 180, and fix the disc-shaped head 187a to the upper side of the bottom part 184 by welding, and make the threaded part 187b protrude downward from the bottom part 184.

[0115] like Figure 9 and Figure 11 As shown, the support bracket 200 is a component that causes a strip-shaped plate member of a predetermined width to bend in a predetermined shape. The support bracket 200, as a surface constituting its bent shape, has: an upper fixing surface 201, which is along the lower surface of the bottom surface 184 of the beam member 180; side surfaces 202, which bend obliquely downwards and outwards from the left and right ends of the upper fixing surface 201; and a lower fixing surface 203, which bends at an obtuse angle outwards and outwards from the lower ends of each side surface 202, and along the upper surface of the front edge 162 of the grain sieve body 161. The support bracket 200, as a bent shape, is formed in an approximately cap-like shape from the aforementioned surfaces.

[0116] The support bracket 200 is fixed to the beam member 180 such that the upper fixing part 201 overlaps with the bottom part 184 from the bottom. The support bracket 200 has a threaded portion 187b passing through both ends of the upper fixing part 201, and is fastened to the beam member 180 at two locations on the left and right sides by nuts 188 that engage with the portion of the threaded portion 187b that protrudes downward from the upper fixing part 201.

[0117] The support bracket 200 is fastened to the grain sieve 130 by bolts 205 in such a state that the left and right lower fixing parts 203 overlap with the front edge 162 of the grain sieve body 161 from the top. The bolts 205 pass through the front edge 162 of the grain sieve body 161 and the lower fixing parts 203 of the support bracket 200 from the bottom and are screwed into the nut part 204 provided on the upper side of the lower fixing parts 203.

[0118] As described above, an inlet 230 located between the lower feed tray 113 and the grain sieve 130 is equipped with a support bracket 200 for supporting the grain sieve 130 on the lower feed tray 113. The support bracket 200 is configured to be fixed to both the beam member 180 and the grain sieve 130. The support bracket 200 is located at two points on the left and right sides between the beam member 180 and the front edge 162 of the grain sieve 130 (see reference). Figure 11 The support bracket 200 has approximately one-third of the left-right dimension of the grain sieve 130 in the left-right direction, and each support bracket 200 is arranged to cover approximately one-third of the left and right sides of the grain sieve 130. At the location where the support bracket 200 is positioned between the beam member 180 and the grain sieve 130, a space 206 is formed, which is a space surrounded by the support bracket 200 and the grain sieve body 161, and has an approximately trapezoidal shape with the front and rear sides open and the upper fixed surface 201 and the grain sieve body 161 respectively forming the upper and lower bottom.

[0119] Regarding the structure in which a support bracket 200 is sandwiched between the lower feed tray 113, which forms the inlet 230 in the front support 171, and the grain sieve 130, the left and right side portions 202 of each support bracket 200 exist as parts that are mounted between the beam member 180 and the grain sieve 130. The side portions 202 of the support bracket 200 act as rectifiers for the screening air from the winnowing machine 47 that passes through the inlet 230.

[0120] The side portion 202 of the support bracket 200 is a plate-shaped portion such that the plate surface is positioned approximately in the left-right direction along the front-back direction. As described above, regarding the support bracket 200 that forms an approximately trapezoidal space portion 206, the side portion 202 is an inclined portion relative to the vertical direction. This is just one example, but... Figure 10 When viewed in the indicated direction, the side portion 202 forms an angle of approximately 10° with respect to the vertical direction. Alternatively, the side portion 202 can also be a vertical surface along the vertical direction. The side portion 202 is provided at a total of four locations using two left and right support brackets 200 located between the beam member 180 and the grain sieve 130. The four locations of the side portion 202 are configured to have a consistent shape when viewed from the side, meaning that they overlap when viewed from the side.

[0121] A support beam 210 is provided in the rear support section 172 to support the rear end of the grain sieve 130. The support beam 210 is configured to be horizontally mounted between the left and right side plates 141, 141. Thus, the support section that supports the rear side of the grain sieve 130 is configured as a beam-shaped part mounted between the left and right side plates 141, 141 of the oscillating screening device 43.

[0122] The support beam 210 is a straight component extending in the left-right direction and is a buckled plate-like component with a constant cross-sectional shape, mounted between the left and right side plates 141. The support beam 210 has the following surfaces constituting its cross-sectional shape: an upper support surface 211, which supports the grain sieve body 161; a rear surface 212, which bends downwards at a right angle from the rear end of the upper support surface 211; and a lower surface 213, which bends forwards at a right angle from the lower end of the rear surface 212. The support beam 210 has an approximately "J"-shaped cross-sectional shape formed by these surfaces.

[0123] The upper support surface 211 is a surface that slopes from front to back along the grain sieve 130. The lower surface 213 has a length that is about 1 / 3 to 1 / 2 the size of the upper support surface 211 in terms of the length extending from the rear surface 212 to the front.

[0124] The support beam 210 has rectangular protrusions 214 protruding outwards on both the left and right ends of the upper support surface 211 (see reference). Figure 8 The tab 214 is provided such that the middle portion of the upper support surface 211 in the front-rear direction partially protrudes to the left and right sides. The support beam 210 is fixed to the left and right side plates 141 by welding or the like, with the tab 214 inserted into the narrow rectangular opening 141c formed through the left and right side plates 141, and the left and right end faces in contact with the inner side faces 141a. The support beam 210 has a space 215 formed in which the rear portion of the upper support surface 211, the rear surface portion 212, and the lower surface portion 213 surround it in three directions, and the left and right sides are closed by the side plates 141 (see reference). Figure 10 ).

[0125] The grain sieve 130 is fastened to the support beam 210 with bolts 216, such that the rear edge 164 of the grain sieve body 161 overlaps with the upper support surface 211 of the support beam 210 from below, and the rear bending surface 168 is located within the space 215. The bolts 216 pass through the rear edge 164 and the upper support surface 211 from below and are screwed into the nut 217 provided on the upper side of the upper support surface 211.

[0126] Along the rear edge 164 and the lateral curved surface 167 of the grain sieve body 161, the L-shaped metal member 218 has a surface 218a along the rear edge 164 such that the bolt 216 passes through it, and is positioned between the bolt 216 and the rear edge 164 of the grain sieve body 161. The bolt-216-based fixing parts of the grain sieve 130 relative to the support beam 210 are provided at two locations at the left and right ends of the support beam 210 (see reference). Figure 8 ).

[0127] At the side support portion 173, the grain sieve 130 is fixedly supported on the lower ends of the left and right side plates 141 by means of the side support bracket 220. The side support bracket 220 is provided on approximately 1 / 4 of the front side of the grain sieve 130 extending downward from the side plate 141. On the side plate 141, a downwardly curved surface 141d is formed with a predetermined width along the lower edge of the main body portion of the side plate 141 that constitutes the inner side surface 141a and the outer side surface 141b, bending inward at a right angle relative to the main body portion of the side plate 141 to the left and right.

[0128] The side support bracket 220 is a bent plate-shaped component with a crank-like bent shape when viewed from behind, taking the front-to-back direction as its length direction. The side support bracket 220 has the following surfaces constituting its bent shape: an upper longitudinal surface 221 along the outer surface 141b of the side plate 141; a transverse surface 222, which bends at a right angle from the lower end of the upper longitudinal surface 221 towards the left and right inner sides, along the lower surface of the lower bent surface 141d of the side plate 141; and a lower longitudinal surface 223, which bends at a right angle from the left and right inner ends of the transverse surface 222 towards the lower side, along the lateral bent surface 167 of the grain sieve 130. The upper longitudinal surface 221 and the lower longitudinal surface 223 are surfaces with the plate thickness direction in the left-to-right direction, and the transverse surface 222 is a surface with the plate thickness direction in the up-down direction.

[0129] In the side support bracket 220, the horizontal section 222 is configured to form a horizontal surface. In addition, the lower longitudinal section 223 is formed such that its lower edge is aligned with the lower edge of the lateral curved section 167 of the grain sieve 130 when viewed from the side, forming an inclined edge that slopes from front to back along the grain sieve 130, and its front edge is formed such that it is aligned with the front edge of the support bracket 200 when viewed from the side, forming a forward-leaning inclined edge, thereby having an approximately triangular shape when viewed from the side.

[0130] The side support bracket 220 fixes the lower longitudinal part 223 to the side bent part 167 of the grain sieve 130 from the left and right sides by welding or the like, thus forming an integral part with the grain sieve 130.

[0131] The side support bracket 220 is fastened to the side plate 141 by bolts 225, with the upper longitudinal section 221 overlapping the side plate 141 from the outer side 141b and the transverse section 222 overlapping the lower buckling section 141d from the lower side. The bolts 225 penetrate the upper longitudinal section 221 and the side plate 141 from the left and right outer sides and engage with the nut portion 226 provided on the inner side 141a of the side plate 141. The fixing portions based on the bolts 225 are provided at two locations on the upper edge of the side support bracket 220, at the front and rear (see reference). Figure 8In the side support bracket 220, the lower longitudinal section 223 is the portion that extends downward from the side plate 141, and the grain sieve 130 is fixed to the lower longitudinal section 223 such that the lateral flexural section 167 runs along the lower part of the lower longitudinal section 223.

[0132] As described above, the grain sieve 130, supported by the front support 171, the rear support 172, and the left and right side support 173 on the frame 140, is set in an inclined position with the front lower than the rear, for example, at an angle of approximately 5 to 10 degrees relative to the horizontal direction. Furthermore, the support structure of the grain sieve 130 of the oscillating screening device 43 is not limited to this embodiment.

[0133] Regarding the screening unit 8 with the above structure, such as Figure 11 As shown, an inlet 230 is provided between the lower feed tray 113 and the grain sieve 130 to guide the screening air from the winnowing machine 47 upward toward the grain sieve 130.

[0134] The grain sieve 130 is positioned such that its front end is below the rear end of the lower feed pan 113, and is connected and supported to the rear end of the lower feed pan 113 (the rear end of the feed pan main body 113a) by means of the support bracket 200 and the beam member 180. With this structure, there is a gap between the front end of the grain sieve 130 and the rear end of the lower feed pan 113 caused by their height difference, which serves as an inlet 230 for introducing the screening air from the winnowing machine 47.

[0135] In detail, the inlet 230 is part of the space between the beam member 180 and the leading edge 162 of the grain sieve 130, and is an opening formed by the bottom part 184 of the beam member 180, the leading edge 162 of the grain sieve 130, and the left and right side plates 141. The space formed by the inlet 230 is divided by the left and right support brackets 200 into a space 206 inside the support brackets 200, a space between the left and right support brackets 200, and a space between the left and right outer sides of the support brackets 200 relative to the side plates 141 (see reference). Figure 11 ).

[0136] The main body 113a of the lower feed tray 113 extends horizontally forward relative to the portion forming the inlet 230, while the grain sieve 130 extends obliquely upward and backward. Regarding the structure with the inlet 230, there is a height difference between the path along the main body 113a from front to back and the path along the grain sieve 130 from front to back, corresponding to the gap forming the inlet 230 (see arrow B1). Figure 12 ).

[0137] Regarding the structure in which an inlet 230 is provided between the lower feed pan 113 and the grain sieve 130, the winnowing machine 47 is configured to blow screening air onto the grain sieve 130. In this embodiment, the winnowing machine 47 is configured to blow screening air below the second air guide plate 119, which serves as the inlet 230, and above and below the grain sieve 130.

[0138] That is, such as Figure 12 As shown, in the screening section 8, the airflow from the winnowing machine 47 (hereinafter also referred to as "winnowing machine screening air") forms a first airflow (arrows C1, C2) flowing below the second airflow vane 119 and a second airflow (arrows C1, C3~C6) flowing below the grain sieve 130. The first airflow of the winnowing machine screening air includes the path portion that passes through the inlet 230 from the front to the rear.

[0139] Multiple guide plates (241-245) are provided as guide sections to form an air path for guiding the screening air of the winnowing machine 47. Each guide plate section consists of a side plate section 139 mounted on the left and right sides (see reference). Figure 5 , Figure 8 The guide plate is composed of a plate-shaped component with a specified thickness between the left and right sides 139, and the guide surface formed by the plate surface of the plate-shaped component is set as an integral part extending across the left and right sides 139 in the left-right direction. Each guide plate has its guide surface set as a surface perpendicular to the plate surface of the side plate 139.

[0140] like Figure 12 As shown, first to fifth guide plates 241 to 245 are provided as guide plates to guide the screening air of the winnowing machine 47.

[0141] The first guide plate 241 is configured to surround the winnowing machine 47 except for the rear lower side. Figure 12 The face is mostly cylindrical except for the lower right side. A cylindrical receiving space 250 for accommodating the winnowing machine 47 is formed by the first guide plate 241.

[0142] The second guide plate portion 242 has an inclined surface that is higher at the rear and lower at the front, so that its front side is continuous with the lower end of the first guide plate portion 241, and its rear side is connected to the upper front end of the first-grade guide groove 45b. The rear end of the second guide plate portion 242 is located below the front end of the grain sieve 130. The inclination angle of the second guide plate portion 242 is approximately the same as the inclination angle of the grain sieve 130.

[0143] The third guide plate portion 243 is located above the second guide plate portion 242 and is configured with a sloping face that is higher at the rear and lower at the front, in a manner that is generally parallel to the second guide plate portion 242. The third guide plate portion 243 connects the front side to the rear end of the first guide plate portion 241. The third guide plate portion 243 is located below the first air direction plate 118 and the second air direction plate 119, such that the front end is located below the middle portion of the first air direction plate 118 in the front-rear direction, and the rear end is located below the middle portion of the second air direction plate 119 in the front-rear direction. The third guide plate portion 243 and the second guide plate portion 242 together form a rear-high, front-low air passage 251 that is continuous with the receiving space 250 directly behind the winnowing machine 47. The air passage 251 is a passage that guides the winnowing machine's screening air from the receiving space 250 mainly to the space below the grain sieve 130.

[0144] The fourth guide plate portion 244 is configured with an inclined surface that is lower at the rear and higher at the front, located above the third guide plate portion 243. The fourth guide plate portion 244 is located near the lower part of the first wind vane 118 and is parallel to the first wind vane 118. The front end of the fourth guide plate portion 244 is positioned further forward than the first wind vane 118, and the rear end is located below the front part of the second wind vane 119. The rear end of the fourth guide plate portion 244 connects to the rear end of the third guide plate portion 243, and together with the third guide plate portion 243, forms an acute-angled corner when viewed from the side.

[0145] The fifth guide plate facet 245 is disposed vertically between the second guide plate portion 242 and the third guide plate portion 243, and is positioned above the rear portion of the second guide plate portion 242. The fifth guide plate facet 245 has a forward inclined facet 245a, which is a sloping facet with a higher rear end and a lower front end; and a rear inclined facet 245b, which is a sloping facet with a lower rear end and a higher front end. When viewed from the side, these faces form an obtuse-angled, flexed shape with the upper side being the convex side. Furthermore, the forward inclined facet 245a is longer than the rear inclined facet 245b in a side cross-section. The fifth guide plate facet 245 is positioned longitudinally such that the rear inclined facet 245b is located below the front end of the grain sieve 130.

[0146] Based on the airflow structure of the winnowing machine 47 with the above-mentioned multiple guide plates (241~245), a first airflow path of the winnowing machine is formed, which is a first airflow path of the winnowing machine that flows below the second airflow plate 119 (refer to arrows C1, C2), and a second airflow path of the winnowing machine that is a second airflow path of the winnowing machine that flows below the grain sieve 130 (refer to arrows C1, C3~C6).

[0147] The first airflow path of the winnowing machine is a path that passes through the space between the second air direction plate 119 and the forward inclined surface 245a of the fifth guide plate surface 245, through the inlet 230, and through the space above the grain sieve 130, heading backward and upward (refer to arrows C1, C2). The first airflow of the winnowing machine's screening air is the airflow toward the rear of the coarse sieve 120.

[0148] The second airflow path of the winnowing machine includes: an airflow path that passes obliquely upward and backward from the airflow path 251 through the space between the fifth guide plate face 245 and the grain sieve 130, in the space below the grain sieve 130 (refer to arrows C1, C3); and an airflow path that passes obliquely upward and backward from the airflow path 251 through the passage 252 between the second guide plate face 242 and the fifth guide plate face 245, and through the space above the first-grade conveyor 45, in the space between the grain sieve 130 and the front guide plate face 145 (refer to arrows C1, C4, C5). The second airflow of the screening air is an airflow toward the front material handler 135A. Furthermore, regarding the second airflow of the winnowing machine's screening air, an airflow is formed that passes from the lower side of the grain sieve 130 upward and through the group of holes 163 (refer to arrow C6).

[0149] As described above, the screening section 8 is configured to blow the screening air from the winnowing machine 47 into the space below the second air direction plate 119 on the upstream side of the inlet 230 and into the space above and below the grain sieve 130.

[0150] In addition, such as Figure 12 As shown, the auxiliary winnowing machine 71 is positioned above and in front of the winnowing machine 47, at approximately the same height as the coarse screen 120, and is located in front of the coarse screen 120. Screening air from the auxiliary winnowing machine 71 (hereinafter also referred to as "auxiliary winnowing machine screening air") passes through the airflow base 260 for the auxiliary winnowing machine 71, which is located above the winnowing machine 47, and is guided towards the oscillating screening device 43. The airflow base 260 is located directly behind the auxiliary winnowing machine 71, communicating with the receiving space of the auxiliary winnowing machine 71.

[0151] The airflow base 260 has a structure that branches into a lower airflow 261 and an upper airflow 262 as its downstream airflow structure. The airflow base 260, the lower airflow 261, and the upper airflow 262 are formed by plate-shaped members of a predetermined shape that are mounted between the left and right side plate portions 139, similar to the guide plate portions (241-245), and plate-shaped members of a predetermined shape that are mounted between the left and right side plates 141.

[0152] A lower guide plate portion 271 is provided below the auxiliary winnowing machine 71 and facing rearward. The lower guide plate portion 271 is positioned such that its front end is directly in front of the lower part of the auxiliary winnowing machine 71 in the front-rear direction, and its rear side is connected to the front end of the fourth guide plate portion 244. The lower guide plate portion 271 has a front inclined portion 271a, which is an inclined portion with a lower rear and a higher front; and a rear inclined portion 271b, which is an inclined portion with a higher rear and a lower front. When viewed from the side, the above portions form an obtuse angled bend with the lower side being the convex side.

[0153] A lower guide plate 272, which together with the lower guide plate 271 forms the air passage base 260, is provided on the upper rear side of the auxiliary winnowing machine 71. The lower guide plate 272 is positioned such that its front end is directly above the middle part of the auxiliary winnowing machine 71 in the front-rear direction, and its rear end is above the front end of the oscillating screening device 43. The lower guide plate 272 has: a front inclined surface 272a, which is an inclined surface that is lower at the rear and higher at the front; a middle inclined surface 272b, which is an inclined surface that is higher at the rear and lower at the front; and a rear horizontal surface 272c, which is a horizontal surface, and the above surfaces form a predetermined buckling shape when viewed from the side.

[0154] The forward-sloping face 272a is positioned opposite to the auxiliary winnowing machine 71 on the lower guide plate portion 271, and is inclined approximately parallel to the forward-sloping face 271a, with the auxiliary winnowing machine 71 positioned between it and the forward-sloping face 271a. The intermediate-sloping face 272b extends obliquely rearward from the rear end of the forward-sloping face 272a in a manner that forms an obtuse angle with the forward-sloping face 272a when viewed from the side, and is located above the rear-sloping face 271b of the lower guide plate portion 271. The intermediate-sloping face 272b has a steeper slope (higher at the rear and lower at the front) than the rear-sloping face 271b, and together with the rear-sloping face 271b, forms the airflow base 260 from the auxiliary winnowing machine 71 toward the front end of the oscillating screening device 43.

[0155] The rear horizontal section 272c extends horizontally from the upper end of the middle inclined section 272b toward the rear. The rear horizontal section 272c is located above the front end of the oscillating screening device 43. The rear horizontal section 272c is positioned such that its rear portion is located at the front end of the arrangement range of the receiving net 42 in the front-rear direction.

[0156] A processing guide plate portion 273 is provided on the upper rear side of the rear horizontal section 272c. The processing guide plate portion 273 is an inclined section that is lower at the rear and higher at the front. It receives the processing material that leaks downward from the front end of the threshing cylinder bar 40a of the threshing cylinder 40 through the receiving mesh 42 and guides it to the upper feed tray 111 on the rear lower side. The processing guide plate portion 273 is composed of a part of the bent plate-shaped component that constitutes the lower guide plate portion 272 or a component separate from that component.

[0157] A branch guide 265 is provided directly in front of the upper feed pan 111 to guide the screening air from the auxiliary winnowing machine 71. The branch guide 265 is composed of a bent plate-shaped component with a predetermined shape, which is mounted between the left and right side plates 141. The branch guide 265 is located between the rear inclined portion 271b of the lower guide plate portion 271 and the rear horizontal portion 272c of the lower guide plate portion 272. The branch guide 265 is located behind the upper part of the auxiliary winnowing machine 71.

[0158] The branch guide portion 265 has: a vertical first facet 265a, which sets the front-to-back direction as the plate thickness direction; and a second facet 265b, which is an inclined facet extending obliquely upward and backward from the lower end of the first facet 265a, and forming an acute-angled corner when viewed from the side. The first facet 265a is the facet of the front plate portion 142 of the frame 140 of the oscillating screening device 43, and is set along the edge of the front side of the side plate 141. The second facet 265b is positioned such that its rear end is located directly below the front end of the upper feed tray 111.

[0159] The first facet 265a of the branch guide portion 265 is located behind the middle inclined facet 272b of the lower guide plate portion 272, and together with the middle inclined facet 272b and the rear horizontal facet 272c, forms the upper air passage 262. The second facet 265b of the branch guide portion 265 is located above the rear portion of the rear inclined facet 271b of the lower guide plate portion 271, and together with the rear inclined facet 271b, forms the lower air passage 261.

[0160] According to the above structure, the auxiliary winnowing machine 71 is configured to blow screening air above the upper feeding plate 111, between the upper feeding plate 111 and the middle feeding plate 112, between the coarse screen 120 and the lower feeding plate 113, and between the lower feeding plate 113 and the grain screen 130.

[0161] That is, such as Figure 12 As shown, in the screening section 8, the airflow formed by the screening air from the auxiliary winnowing machine 71 includes: a first airflow of auxiliary winnowing machine screening air flowing above the upper feed pan 111 (refer to arrows E1, E2); a second airflow of auxiliary winnowing machine screening air flowing between the upper feed pan 111 and the middle feed pan 112 (refer to arrows E3, E4); a third airflow of auxiliary winnowing machine screening air flowing between the coarse screen 120 and the lower feed pan 113 (refer to arrows E3, E5, E6); and a fourth airflow of auxiliary winnowing machine screening air flowing between the lower feed pan 113 and the grain screen 130 (refer to arrows E3, E5, E7, E8).

[0162] Therefore, the airflow structure of the secondary winnowing machine 71 for screening airflow forms a first airflow path of the secondary winnowing machine that constitutes the first airflow (arrows E1, E2), a second airflow path of the secondary winnowing machine that constitutes the second airflow (arrows E3, E4), a third airflow path of the secondary winnowing machine that constitutes the third airflow (arrows E3, E5, E6), and a fourth airflow path of the secondary winnowing machine that constitutes the fourth airflow (arrows E3, E5, E7, E8).

[0163] The first air path of the auxiliary winnowing machine branches off from the air path base 260 to the upper air path 262 and passes through the space between the middle inclined surface 272b and the rear horizontal surface 272c and the first surface 265a, passing rearward through the space above the upper feed pan 111 (refer to arrows E1, E2). The first airflow of the screening air of the auxiliary winnowing machine is the airflow from the upper feed pan 111 along the upper side of the middle feed pan 112 and the coarse screen 120 towards the rear. Here, there is a drop caused by the difference in the height position of the two feed pans, which is on the path from front to rear along the upper feed pan 111 and the path from front to rear along the rear horizontal surface 112d of the middle feed pan 112 (refer to arrow B2).

[0164] The second air path of the auxiliary winnowing machine branches off from the base of the air path 260 to the lower air path 261 and passes rearward through the space between the upper feed plate 111 and the middle feed plate 112 (refer to arrows E3 and E4). The second airflow of the screening air of the auxiliary winnowing machine is the airflow from the middle feed plate 112 along the upper side of the coarse screen 120 and moves rearward.

[0165] The third airflow of the auxiliary winnowing machine branches off from the airflow base 260 to the lower airflow 261 and passes through the space between the middle feed plate 112 and the first airflow vane 118, and then flows rearward through the space between the coarse screen 120 and the lower feed plate 113 (refer to arrows E3, E5, E6). The third airflow of the auxiliary winnowing machine is an airflow that flows rearward along the lower side of the coarse screen 120. Thus, the lower airflow 261, as its downstream airflow structure, has a structure that branches off to the upper side of the middle feed plate 112 and the lower side of the middle feed plate 112.

[0166] The fourth air path of the auxiliary winnowing machine branches off from the air path base 260 to the lower air path 261 and passes through the space between the middle feed pan 112 and the first air direction plate 118, and the space below the lower feed pan 113. It then passes rearward through the space between the lower feed pan 113 and the grain sieve 130 (refer to arrows E3, E5, E7, E8). The fourth air path of the auxiliary winnowing machine includes a horizontal air path, namely the lower air path 263, formed by the lower feed pan 113 (the feed pan body 113a) and the second air direction plate 119 on the lower side of the lower feed pan 113.

[0167] The fourth airflow of the sieving air of the auxiliary winnowing machine is an airflow that flows backward along the grain sieve 130 via the inlet 230, and it is an airflow that merges with the first airflow (arrows C1, C2) of the winnowing machine near the inlet 230. Thus, the airflow branching off from the lower airflow path 261 to the lower side of the middle feed plate 112 has a structure that branches off to the upper side of the lower feed plate 113 and the lower side of the lower feed plate 113.

[0168] As described above, the screening unit 8 is configured to blow the screening air from the auxiliary winnowing machine 71 into the space above the upper feed plate 111, the space between the upper feed plate 111 and the middle feed plate 112, the space between the coarse screen 120 and the lower feed plate 113, and the space between the lower feed plate 113 and the grain screen 130.

[0169] Furthermore, the oscillating screening device 43 according to this embodiment has the following structure. That is, as... Figure 6 , Figure 7 and Figure 13 As shown, a screen section 390 is provided on the oscillating screening device 43 and on the rear side of the upper feed plate 111, in which a plurality of screen lines 391 are arranged in parallel.

[0170] The sieve section 390 is provided in the left-right direction over the entire area of ​​the main body 111a covering the upper feed tray 111 (see reference). Figure 7 Therefore, the sieve section 390 is provided over a generally entire area between the left and right side plates 141 in the left-right direction. The sieve section 390 is composed of two sieve components 395 arranged adjacent to each other in the left-right direction (see reference). Figure 7 ).

[0171] The sieve component 395 is a bent plate-shaped component with a defined bent shape, having a fixed plate portion 392 and a sieve body portion 393 including a plurality of sieve lines 391, and the above portions form an obtuse-angled bent curve shape when viewed from the side.

[0172] The fixed plate portion 392 is a rectangular plate-shaped portion with the left-right direction as its length direction, and the left-right dimension is set to approximately half the left-right dimension of the upper feed plate 111. The screen body portion 393 has: a base portion 394, which constitutes the front edge portion of the screen body portion 393; and a plurality of screen line portions 391, which extend rearward from the base portion 394 and have a comb-like shape.

[0173] The base 394 is a plate-shaped portion formed in the same range as the fixed plate portion 392 in the left-right direction, and constitutes the protruding base of a plurality of sieve wire portions 391. The base 394 is connected to the rear side of the fixed plate portion 392 and together with the fixed plate portion 392 forms an obtuse-angled curved surface. The sieve wire portion 391 is a narrow, straight portion extending from the base 394 in a predetermined direction. The plurality of sieve wire portions 391 and the base 394 are formed in a coplanar shape and arranged at predetermined intervals in the left-right direction.

[0174] The screen component 395 constituting the screen section 390 is fixedly supported by the fixing plate portion 392 on the rear edge of the upper feed plate 111, i.e., the rear edge of the main body 111a. The screen component 395 is fixed to the upper feed plate 111 by bolts 396 with the fixing plate portion 392 overlapping the rear edge of the upper feed plate 111. The bolts 396 penetrate the fixing plate portion 392 of the screen component 395 and the rear edge of the upper feed plate 111, and engage with the nut portion 397 located on the inner (lower) side of the main body 111a (see reference). Figure 13 Regarding each screen component 395, the fixing part based on the bolt 396 is provided at three locations in the left-right direction: at both ends and the center of the fixing plate part 392.

[0175] At the rear end of the upper feed pan 111, a rearwardly inclined surface 111d is formed along the buckling shape of the screen member 395 based on the fixed plate portion 392 and the screen body portion 393, forming an obtuse angle together with the body portion 111a. The rearwardly inclined surface 111d overlaps from below with the base portion 394 of the screen member 395 and the base portion of each screen line portion 391.

[0176] The sieve section 390 positions a plurality of sieve wire sections 391 above the central feed tray 112. That is, the central feed tray 112 is positioned below the sieve section 390. In this embodiment, the rear horizontal portion 112d of the central feed tray 112 is included entirely or substantially entirely in the front-rear direction and within the arrangement range of the sieve wire sections 391, and the front-rear arrangement ranges of the sieve wire sections 391 and the rear horizontal portion 112d are substantially aligned with each other (see reference). Figure 6 ).

[0177] Regarding the sieve section 390, the multiple sieve wire sections 391 are arranged in an inclined shape, with the rear higher than the front. Figure 6In the example shown, the angle between the multiple sieve sections 391 and the horizontal direction is, for example, about 10°. Furthermore, the magnitude of the inclination angle of the sieve sections 391 relative to the horizontal direction is not particularly limited.

[0178] As described above, regarding the oscillating screening device 43, a screen section 390 is provided above the rear of the middle feed plate 112, consisting of two screen components 395 mounted on the rear side of the upper feed plate 111. Furthermore, in this embodiment, the screen section 390 is composed of two screen components 395 arranged adjacent to each other in the left-right direction, but the number of screen components 395 constituting the screen section 390 is not limited. The screen section 390 may also be composed of a single screen component or multiple screen components of three or more.

[0179] In addition, such as Figure 6 , Figure 8 and Figure 9 As shown, regarding the oscillating screening device 43, a screen section 190 is provided on the rear side of the lower feed pan 113, in which multiple screen lines 191 are arranged in a parallel configuration. The screen section 190 provided for the lower feed pan 113 is the second screen section of the oscillating screening device 43, and is provided in the same manner as the screen section 390 provided for the upper feed pan 111, which serves as the first screen section.

[0180] The sieve section 190 is provided in the left-right direction over the approximate entire area of ​​the feed tray main body 113a that covers the lower feed tray 113 (see reference). Figure 8 Therefore, the sieve section 190 is provided in the left-right direction over a generally entire area between the side plates 141 extending to the left and right. The sieve section 190 is composed of two sieve components 195 arranged adjacent to each other in the left-right direction (see reference). Figure 8 ).

[0181] The sieve component 195 is a bent plate-shaped component with a defined bent shape, having a fixed plate portion 192 and a sieve body portion 193 including a plurality of sieve lines 191, and the above portions form an obtuse-angled bent curve shape when viewed from the side.

[0182] The fixing plate portion 192 is a rectangular plate-shaped portion with the left-right direction as its length direction, and the left-right dimension is set to approximately half the left-right dimension of the grain sieve 130. The sieve body portion 193 has: a base portion 194, which constitutes the front edge portion of the sieve body portion 193; and a plurality of sieve wire portions 191, which extend rearward from the base portion 194 and have a comb-like shape.

[0183] The base 194 is a plate-shaped portion formed in the same range as the fixed plate 192 in the left-right direction, and forms the protruding base of a plurality of sieve wire portions 191. The base 194 is connected to the rear side of the fixed plate 192 and together with the fixed plate 192 forms an obtuse-angled curved surface. The sieve wire portion 191 is a narrow, straight portion extending from the base 194 in a predetermined direction. The plurality of sieve wire portions 191 and the base 194 are formed in a coplanar shape and arranged at predetermined intervals in the left-right direction.

[0184] The screen component 195 constituting the screen section 190 is fixedly supported by the fixing plate portion 192 on the rear edge of the lower feed tray 113, i.e., the rear edge of the feed tray main body portion 113a. The screen component 195 is fixed to the lower feed tray 113 by bolts 196 with the fixing plate portion 192 overlapping the rear edge of the lower feed tray 113. The rearward inclined portion 113d of the lower feed tray 113 overlaps with the base 194 of the screen component 195 from below. The bolts 196 pass through the fixing plate portion 192 of the screen component 195 and the rear edge of the lower feed tray 113, and are screwed into the nut portion 197 provided on the inner (lower) side of the feed tray main body portion 113a (see reference). Figure 9 The nut portion 197 is located within the cylindrical space portion 181 of the beam member 180, which is located on the lower side of the main body portion 113a of the feed tray and the rear inclined portion 113d. Regarding each screen member 195, the fixing portions based on the bolts 196 are provided at three locations in the left-right direction: at both ends and the center of the fixing plate portion 192.

[0185] The sieve section 190 positions a plurality of sieve wire sections 191 between the front portion of the grain sieve 130 and the middle portion of the coarse sieve 120 in the front-rear direction. Regarding the sieve section 190, the plurality of sieve wire sections 191 are arranged in an inclined configuration, with the rear higher than the front, in a manner generally parallel to the grain sieve 130. Figure 6 In the example shown, the angle between the multiple sieve sections 191 and the horizontal direction is, for example, about 10°. Furthermore, the magnitude of the inclination angle of the sieve sections 191 relative to the horizontal direction is not particularly limited.

[0186] The sieve section 190 is configured to overlap with the grain sieve 130 when viewed from above (see reference). Figure 8 The sieve section 190 is positioned such that the ends (rear ends) of the plurality of sieve wire sections 191 are located above the front portion of the grain sieve 130 in the front direction, and is configured to cover approximately one-quarter of the front side of the grain sieve 130. Furthermore, the extension length of the plurality of sieve wire sections 191 is not particularly limited. Additionally, the sieve section 190 is positioned in the left-right direction covering approximately the entire grain sieve 130.

[0187] As described above, regarding the oscillating screening device 43, a screen section 190 is provided above the front of the grain screen 130, consisting of two screen components 195 mounted on the rear side of the lower feed tray 113. Furthermore, in this embodiment, the screen section 190 is composed of two screen components 195 arranged adjacent to each other in the left-right direction, but the number of screen components 195 constituting the screen section 190 is not limited. The screen section 190 may also be composed of a single screen component or multiple screen components of three or more.

[0188] In addition, such as Figure 6 As shown, regarding the oscillating screening device 43, the middle feed plate 112 and the lower feed plate 113 are configured such that at least a portion overlaps with each other when viewed from above. That is, in the front-rear direction, the rear end of the middle feed plate 112 is located further back than the front end of the lower feed plate 113 located below the middle feed plate 112, and when viewed from above, the rear part of the middle feed plate 112 and the front part of the lower feed plate 113 overlap with each other.

[0189] In this embodiment, in the front-rear direction, the rear end of the middle feed tray 112 is located above the front of the lower feed tray 113. Moreover, most of the rear side of the rear horizontal portion 112d of the middle feed tray 112 is located above the front end of the feed tray body portion 113a and the front inclined portion 113b of the lower feed tray 113, and the middle feed tray 112 is configured such that most of the rear side of the rear horizontal portion 112d overlaps with the lower feed tray 113 when viewed from above.

[0190] Furthermore, in this embodiment, the middle feed tray 112 is configured such that a portion overlaps with the lower feed tray 113 when viewed from above; however, the middle feed tray 112 may also be configured such that its entirety or substantially its entirety overlaps with the lower feed tray 113 when viewed from above. Additionally, the front portion of the middle feed tray 112 is positioned below the rear portion of the upper feed tray 111, and is configured such that a portion overlaps with the upper feed tray 111 when viewed from above.

[0191] According to the combine harvester 1 of this embodiment with the above structure, regarding the screening section 8, the screening air can act on the threshed material falling from the threshing section 7, thereby improving the processing capacity of the screening section 8.

[0192] Regarding the screening section 8, the oscillating screening device 43, which receives screening air from the auxiliary winnowing machine 71, has an upper feed plate 111, a middle feed plate 112, and a lower feed plate 113 for the structure having a coarse screen 120 and a grain screen 130. That is, the oscillating screening device 43 has a three-layer structure of upper, middle, and lower feed plates for the coarse screen 120 and the grain screen 130. The aforementioned feed plates (111, 112, 113) are arranged from top to bottom in a staggered position from front to back. Furthermore, the oscillating screening device 43 utilizes the three-layer structure of the feeding tray to form the following airflow for the secondary winnowing machine 71: a first airflow path for the secondary winnowing machine constituting a first airflow (arrows E1, E2); a second airflow path for the secondary winnowing machine constituting a second airflow (arrows E3, E4); a third airflow path for the secondary winnowing machine constituting a third airflow (arrows E3, E5, E6); and a fourth airflow path for the secondary winnowing machine constituting a fourth airflow (arrows E3, E5, E7, E8) (see reference). Figure 12 ).

[0193] Based on this structure, by forming the first to fourth air paths of the auxiliary winnowing machine, the three-layer structure of the feeding tray can generate airflow from the auxiliary winnowing machine 71 in the upper and lower separated spaces (each air path). As a result, the screening air from the auxiliary winnowing machine 71 can effectively target the materials present in each air path. Therefore, despite its compact structure, it can improve the screening efficiency and screening accuracy of the materials.

[0194] Additionally, due to the height difference between the rear side of the upper feed pan 111 and the middle feed pan 112 (refer to...) Figure 12 Arrow B2) causes the material to fall from the upper feed pan 111 onto the middle feed pan 112, thus creating a floating state. The second airflow of the auxiliary winnowing machine acts on this floating material, easily dispersing it and improving the separation of rice and dust. Therefore, despite its compact design, it improves the screening efficiency and accuracy of the material.

[0195] Similarly, at the rear side of the inlet 230, due to the drop at the rear side of the lower feed tray 113 (refer to...) Figure 12 Arrow B1) causes the material to fall from the lower feed pan 113 onto the grain sieve 130, thus creating a floating state. The first airflow of the winnowing machine and the fourth airflow of the auxiliary winnowing machine act on the floating material, easily dispersing it and improving the separation of rice and dust. Therefore, despite its compact design, it improves the screening efficiency and accuracy of the material.

[0196] In addition, the winnowing machine 47 is configured to blow screening air to the grain sieve 130 using the first and second air paths of the winnowing machine, and the auxiliary winnowing machine 71 is configured to blow screening air to the top of the upper feed plate 111, between the upper feed plate 111 and the middle feed plate 112, between the coarse sieve 120 and the lower feed plate 113, and between the lower feed plate 113 and the grain sieve 130 using the first to fourth air paths of the auxiliary winnowing machine.

[0197] According to this structure, the screening air from winnowing machine 47 and auxiliary winnowing machine 71 can pass through dedicated air paths, thus suppressing interference between the two screening air streams and achieving stable blowing of the screening air. As a result, the screening air from winnowing machine 47 and auxiliary winnowing machine 71 can effectively act on the processed material, improving the screening efficiency and screening accuracy of the processed material.

[0198] As described above, the screening unit 8 in this embodiment forms multiple air paths that allow the screening air to act on the processed material during the period when it falls from the receiving net 42 to the grain sieve 130, and multiple air paths are also formed between the coarse screen 120 and the grain sieve 130, thereby improving the processing capacity of the processed material.

[0199] Furthermore, a screen section 390 is provided on the rear side of the upper feeding plate 111, and a middle feeding plate 112 is disposed below the screen section 390. With this structure, the screen section 390, located above the middle feeding plate 112, functions to screen the processed material leaking downwards from the receiving mesh 42 and the processed material conveyed from the upper feeding plate 111, and performs screening as the oscillating screening device 43 oscillates. This effectively removes straw and other debris, and prevents the processed material from leaking out of the middle feeding plate 112, effectively improving the screening efficiency and accuracy of the processed material.

[0200] Furthermore, on the rear side of the lower feed tray 113, the sieve section 190 is configured to overlap with the grain sieve 130 when viewed from above. With this structure, the sieve section 190 functions above the front of the grain sieve 130 to screen the material passing down from the coarse sieve 120 and the material conveyed from the lower feed tray 113, and performs screening as the oscillating screening device 43 oscillates. This effectively removes straw and other debris, significantly improving the screening efficiency and accuracy of the processed material.

[0201] In addition, the middle feed tray 112 and the lower feed tray 113 are configured such that at least a portion of them overlap when viewed from above.

[0202] This structure prevents the processed material from falling directly from the central feed pan 112 onto the grain sieve 130. This effectively improves the screening efficiency and accuracy of the screening section 8.

[0203] In addition, a guide plate 114 is provided on the upper feeding tray 111 to guide the grains towards the center in the left-right direction. With this structure, the grain flow moving backward on the upper feeding tray 111 can be directed towards the center in the left-right direction, which can effectively improve the screening efficiency and screening accuracy of the processed material.

[0204] In addition, the oscillating screening device 43 has a support bracket 200 that supports the front end of the grain sieve 130 on the lower feed tray 113. With this structure, the air passage area (of the inlet 230) between the lower feed tray 113 and the grain sieve 130 can be ensured with a simple structure.

[0205] Furthermore, the support bracket 200 has left and right side portions 202 that function as rectifiers. With this structure, the screening airflow from the winnowing machine 47 and the auxiliary winnowing machine 71, passing through the inlet 230 from front to rear, can be rectified at the inlet 230. This allows the screening airflow from the winnowing machine 47 and the auxiliary winnowing machine 71 to effectively act on the processed material, improving screening efficiency and accuracy.

[0206] Additionally, the oscillating screening device 43 has a second airflow vane 119, which is disposed below the lower feed pan 113 and together with the lower feed pan 113 forms an airflow path, namely the lower airflow path 263, for the screening airflow from the auxiliary winnowing machine 71. According to this structure, a fourth airflow (refer to) can be formed below the lower feed pan 113 for the screening airflow from the auxiliary winnowing machine. Figure 12 The space section marked with arrows E3, E5, E7, and E8 serves as the lower airflow path 263, relative to the flow path of the screening air from the winnowing machine 47 (winnowing machine first airflow path, see reference). Figure 12 The sections are separated by arrows C1 and C2. This allows the screening air from winnowing machine 47 and auxiliary winnowing machine 71 to effectively act on the processed material, thereby improving the screening efficiency and accuracy of the processed material.

[0207] The above-described embodiments are examples of the present invention, and the present invention is not limited to the above-described embodiments. Therefore, even embodiments other than those described above can be modified in various ways depending on the design, etc., as long as they do not depart from the technical concept involved in the present invention. In addition, the effects described in this disclosure are merely examples and are not limited thereto; other effects may also be present.

[0208] In the above embodiment, the combine harvester 1 is a conventional combine harvester, but other combine harvesters, such as self-tapping combine harvesters, can also be used with the present invention.

[0209] This technology can take the following structure. Furthermore, the structures described below can be selected and combined arbitrarily.

[0210] (1) A combine harvester comprising: a threshing section for threshing crops; and a oscillating screening device for screening the threshed crop after threshing by the threshing section, characterized in that,

[0211] The combine harvester is equipped with:

[0212] A winnowing machine that blows screening air onto the oscillating screening device; and

[0213] A secondary winnowing machine, positioned higher than the winnowing machine, blows screening air onto the oscillating screening device.

[0214] The swing screening device has:

[0215] Coarse screen, which screens the threshed material;

[0216] A grain sieve is positioned below the coarse sieve;

[0217] The upper feeding tray is located at the front of the oscillating screening device;

[0218] A middle feed tray, positioned below the upper feed tray and in front of the coarse screen; and

[0219] The lower feeding tray is located between the coarse screen and the grain screen.

[0220] (2) The combine harvester described in (1) is characterized in that,

[0221] The winnowing machine is configured to blow screening air onto the grain sieve.

[0222] The auxiliary winnowing machine is configured to blow screening air above the upper feeding plate, between the upper feeding plate and the middle feeding plate, between the coarse screen and the lower feeding plate, and between the lower feeding plate and the grain screen.

[0223] (3) The combine harvester according to (1) or (2) is characterized in that,

[0224] Multiple screen sections with parallel screen lines are provided on the rear side of the upper feeding tray.

[0225] The central feed tray is positioned below the screen section.

[0226] (4) The combine harvester described in any one of (1) to (3) is characterized in that,

[0227] When the middle feed tray and the lower feed tray are configured in a top view, at least a portion of them overlap each other.

[0228] (5) The combine harvester described in any one of (1) to (4) is characterized in that,

[0229] The upper feeding tray is equipped with a guide component that guides the grains to the center in the left-right direction.

[0230] (6) The combine harvester according to any one of (1) to (5), characterized in that,

[0231] The oscillating screening device has a support component that supports the grain sieve on the lower feed tray.

[0232] (7) The combine harvester according to (6) is characterized in that,

[0233] The support component has a rectifier plate section that functions to filter the airflow.

[0234] (8) The combine harvester described in (2) is characterized in that,

[0235] The oscillating screening device has an airflow direction component located below the lower feed pan and forming an airflow path together with the lower feed pan for screening airflow from the auxiliary winnowing machine.

Claims

1. A combine harvester comprising: a threshing section for threshing crops; and a oscillating screening device for screening the threshed crop after threshing by the threshing section. Its features are, The combine harvester is equipped with: A winnowing machine that blows screening air onto the oscillating screening device; and A secondary winnowing machine, positioned higher than the winnowing machine, blows screening air onto the oscillating screening device. The swing screening device has: The coarse screen is used to screen the threshed material. A grain sieve is positioned below the coarse sieve; The upper feeding tray is located at the front of the oscillating screening device; The middle feeding tray is located below the upper feeding tray and in front of the coarse screen; as well as The lower feeding tray is located between the coarse screen and the grain screen.

2. The combine harvester according to claim 1, characterized in that, The winnowing machine is configured to blow screening air onto the grain sieve. The auxiliary winnowing machine is configured to blow screening air above the upper feeding plate, between the upper feeding plate and the middle feeding plate, between the coarse screen and the lower feeding plate, and between the lower feeding plate and the grain screen.

3. The combine harvester according to claim 1 or claim 2, characterized in that, A sieve section is provided on the rear side of the upper feeding tray, in which multiple sieve lines are arranged in a parallel manner. The central feed tray is positioned below the screen section.

4. The combine harvester according to claim 1, characterized in that, When the middle feed tray and the lower feed tray are configured in a top view, at least a portion of them overlap each other.

5. The combine harvester according to claim 1, characterized in that, The upper feeding tray is equipped with a guide component that guides the grains to the center in the left-right direction.

6. The combine harvester according to claim 1, characterized in that, The oscillating screening device has a support component that supports the grain sieve on the lower feed tray.

7. The combine harvester according to claim 6, characterized in that, The support component has a rectifier plate section that functions to filter the airflow.

8. The combine harvester according to claim 2, characterized in that, The oscillating screening device has an airflow direction component located below the lower feed pan and forming an airflow path together with the lower feed pan for screening airflow from the auxiliary winnowing machine.

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