combine

Abstract

The present invention provides a combine harvester that can suppress the deterioration of sorting accuracy in the sorting section due to the increase in threshed material, and can maintain sorting performance regardless of the amount of threshed material being processed. [Solution] The oscillating sorting device 43 includes a chaff sieve 120, a grain sieve 130 located below the chaff sieve 120, and a lower grain pan 112 located between the chaff sieve 120 and the grain sieve 130. Between the lower grain pan 112 and the grain sieve 130, there is an inlet 230 for guiding sorting air from the winnowing machine 47 to the upper part of the grain sieve 130. The winnowing machine 47 is configured to send sorting air below the lower grain pan 112, which is upstream of the inlet 230, and below the grain sieve 130. The auxiliary winnowing machine 71 is configured to send sorting air above the chaff sieve 120 and between the chaff sieve 120 and the lower grain pan 112.

Description

Technical Field

[0001] The present invention relates to a combine harvester equipped with a rocking sorting device for sorting grain kernels threshed by a threshing unit.

Background Art

[0002] Some combine harvesters are configured to convey the crops cut by a cutting unit to a threshing unit via a conveying device, and to sort the grain kernels (threshed products) threshed by the threshing unit by a sorting unit provided below the threshing unit. The sorting unit has a rocking sorting device that sorts grain kernels by rocking. The rocking sorting device includes, as sorting components, a chaff sieve having a plurality of fins, and a grain sieve provided below the chaff sieve. In addition, the sorting unit is provided with a configuration for generating sorting air, such as a winnower and a fan, to obtain a winnowing effect.

[0003] Regarding the configuration of the sorting unit, Patent Document 1 describes a configuration including a winnower and a sub-winnower (second winnower) that compensates for a shortage of the air volume of the winnower. The sub-winnower is provided to send sorting air between the grain pan and the grain sieve in a configuration where a grain pan is disposed between the chaff sieve and the grain sieve located below it.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] According to the configuration disclosed in Patent Document 1, since the sorting air from the winnower and the sub-winnower does not directly act on the chaff sieve, when the throughput of the threshed product increases, sorting in the grain sieve and the like becomes insufficient, and there is a problem that the sorting accuracy in the sorting unit deteriorates.

[0006] This invention has been made in view of the above-mentioned problems, and aims to provide a combine harvester that can suppress the deterioration of sorting accuracy in the sorting section due to the increase in threshed material, and can maintain sorting performance regardless of the amount of threshed material processed. [Means for solving the problem]

[0007] The combine harvester according to the present invention comprises a threshing unit for threshing crops and an oscillating sorting device for sorting the threshed material from the threshing unit, the combine harvester comprising a winnowing machine for blowing sorting air to the oscillating sorting device and a secondary winnowing machine provided at a higher position than the winnowing machine for blowing sorting air to the oscillating sorting device, the oscillating sorting device comprising a chaff sieve for sorting the threshed material, a grain sieve provided below the chaff sieve, and a chuck provided between the chaff sieve and the grain sieve. The apparatus comprises a grain pan for receiving threshed material that leaks from the chaff sieve, an inlet provided between the grain pan and the grain sieve for guiding the sorting air from the winnowing machine upwards to the grain sieve, the winnowing machine being positioned upstream of the inlet, below the grain pan, and below the grain sieve so as to direct the sorting air, and the auxiliary winnowing machine being positioned above the chaff sieve and between the chaff sieve and the grain pan so as to direct the sorting air.

[0008] The combine harvester according to the present invention is provided in which a branch air passage is provided between the winnowing machine and the grain pan, which branches off from the air passage for sorting air from the winnowing machine to the grain sieve and guides the sorting air toward the grain pan.

[0009] The combine harvester according to the present invention is provided with a sieving section on the rear side of the grain pan, in which a plurality of sieving wires are arranged in parallel, and the sieving section is provided so as to overlap with the grain sieve when viewed from above.

[0010] The combine harvester according to the present invention is provided with a first conveyor located below the grain sieve and extending in the width direction of the machine body to collect the first grain, and the sieving section is provided to be located above the first conveyor.

[0011] The combine harvester according to the present invention is provided in which a support member is provided at the inlet to support the grain sheave relative to the grain pan.

[0012] The combine harvester according to the present invention is characterized in that the support member has a rectifying plate portion that acts on the sorting airflow. [Effects of the Invention]

[0013] According to the present invention, the deterioration of sorting accuracy in the sorting section due to the increase in threshed material can be suppressed, and sorting performance can be maintained regardless of the amount of threshed material processed. [Brief explanation of the drawing]

[0014] [Figure 1] This is a left side view of a combine harvester according to one embodiment of the present invention. [Figure 2] This is a right side view of a combine harvester according to one embodiment of the present invention. [Figure 3] This is a plan view of a combine harvester according to one embodiment of the present invention. [Figure 4] This figure shows the power transmission configuration in a combine harvester according to one embodiment of the present invention. [Figure 5] This is a left side cross-sectional view showing the configuration of the threshing and sorting sections according to one embodiment of the present invention. [Figure 6] This is a left side cross-sectional view showing the configuration of the sorting unit according to one embodiment of the present invention. [Figure 7] This is a plan cross-sectional view showing the configuration of a grain sieve and its vicinity according to one embodiment of the present invention. [Figure 8] This is a left side cross-sectional view showing the front support configuration of a glen sieve according to one embodiment of the present invention. [Figure 9] It is a left side cross-sectional view showing the support structure of the rear part of the grain sheath according to an embodiment of the present invention. [Figure 10] It is a cross-sectional view taken along the arrow A-A in FIG. 8. [Figure 11] It is a left side cross-sectional view showing the configuration of the sorting unit and the flow of sorting air according to an embodiment of the present invention. [Figure 12] It is a left side cross-sectional view showing the configuration of a modified example of the sorting unit and the flow of sorting air according to an embodiment of the present invention.

Mode for Carrying out the Invention

[0015] Using FIGS. 1 to 5, the overall configuration of the combine 1 according to the present embodiment will be described. In the following description, the left side (the lower side in FIG. 3) and the right side (the upper side in FIG. 3) facing the front of the combine 1 are defined as the left side and the right side of the combine 1, respectively.

[0016] As shown in FIGS. 1 and 2, the combine 1 according to the present embodiment is a general-type combine as a harvesting machine that scrapes the harvested crops (rice, wheat, soybeans, corn, etc.) in the field into the machine body, threshes, sorts, stores the grains, and can be carried out of the machine as appropriate. The combine 1 includes a self-propelled traveling machine body 2 and a cutting unit 3 provided at the front end of the traveling machine body 2. The cutting unit 3 is configured as a cutting device that takes in uncut grain straws such as rice and wheat while cutting them, and is attached to the traveling machine body 2 so as to be able to move up and down.

[0017] The traveling machine body 2 includes a traveling unit 4 configured as a crawler-type traveling device having a pair of left and right crawler units 5, 5. A machine body frame 6 is installed between the left and right crawler units 5, 5. Each crawler unit 5 has a plurality of rotating bodies including a drive sprocket 5a provided at its front end, and a crawler 5c wound around these rotating bodies. The drive sprocket 5a is rotationally driven by receiving the transmission of power from the engine 25 provided in the combine 1.

[0018] On the left side of the machine frame 6, there is a threshing unit 7 for threshing the stalks of grain that have been cut and supplied by the harvesting unit 3, and a sorting unit 8 for sorting the grains threshed by the threshing unit 7. The threshing unit 7 and the sorting unit 8 are arranged behind the harvesting unit 3, with the threshing unit 7 on the upper level and the sorting unit 8 on the lower level.

[0019] On the machine frame 6, a grain storage section 9 is provided to the right of the threshing section 7 and sorting section 8, and has a grain tank 10 for storing grain (clean grain) sorted in the sorting section 8. Inside the grain tank 10, a lower discharge conveyor 11 is provided to transport the stored grain toward the discharge port of the grain tank 10 (see Figure 4). A vertical conveyor 12 is erected vertically so as to communicate with the discharge port of the grain tank 10. A grain discharge conveyor 13 is connected to the upper end of the vertical conveyor 12. The grain discharge conveyor 13 is provided so as to be able to rotate horizontally and swing up and down around a horizontal axis. The grain in the grain tank 10 is transported by these conveyors and discharged from a paddy input port 14 provided at the tip of the grain discharge conveyor 13 to the bed of a truck or a container.

[0020] On the machine frame 6, the driver's compartment 15 is located in front of the grain storage section 9, that is, in the front right position on the machine frame 6, where the operator sits. The driver's compartment 15 is covered by a cabin 16. The driver's compartment 15 is equipped with a driver's seat 17, a steering wheel 18 located in front of the driver's seat 17, and various operating parts such as a main gear lever 19, a sub-gear lever, and a work clutch lever (see Figure 2). The work clutch lever is an operating tool for engaging and disengaging the threshing clutch 57 and the harvesting clutch 75 (see Figure 4).

[0021] Below the control unit 15 on the aircraft frame 6, an engine 25 is provided as the power source. The engine 25 is located in the space below the control unit 15, on the front right side of the aircraft frame 6. The engine 25 is, for example, a diesel engine.

[0022] The harvesting unit 3 will now be described. The harvesting unit 3 includes a feeder 30 as a conveying device, a platform 31 as a grain header, a cutting blade device 32, a pair of left and right grass dividers 33, 33, and a raking reel 34.

[0023] The feeder 30 is a supply and conveying device that transports the grain stalks harvested in the harvesting section 3 and supplies them to the threshing section 7. The feeder 30 has a feeder house 35 as a housing and a conveyor 36 for transporting grain stalks (see Figure 4) provided inside the feeder house 35. The feeder house 35 is configured as a roughly rectangular tube with its longitudinal direction as the front-to-back direction in a plan view. The feeder 30 is located to the left of the cabin 16 (see Figure 3) and is provided with the rear end opening of the feeder house 35 communicating with the front threshing opening 7a of the threshing section 7 (see Figure 1).

[0024] The platform 31 is configured in a horizontally elongated bucket shape and is connected to the front side of the feeder 30 so as to communicate with the front end opening of the feeder house 35. A scraping auger (platform auger) 37 is provided inside the platform 31. The scraping auger 37 is mounted on an axis so as to be rotatable with the left-right direction as the axis of rotation.

[0025] The cutting blade device 32 is provided on the front lower edge of the platform 31 and is configured in the shape of a clipper. The pair of left and right grass dividers 33, 33 are provided so as to protrude forward from the left and right sides of the front of the platform 31. The raking reel 34 is a reel with a tine bar and is provided in a position in front and above the raking auger 37. The raking reel 34 is supported so as to be rotatable with the left-right direction as the axis of rotation between the tips of a pair of left and right reel support arms 34a, 34a, whose base ends are pivotally supported on the platform 31. The raking reel 34 rotates and continuously acts on the podded portion of the grain stalk, raking the podded portion of the grain stalk towards the raking auger 37. Power from the engine 25, transmitted via various transmission mechanisms, is used for the operation of each part of the cutting unit 3.

[0026] A front rotor 26 is provided at the rear of the feeder 30 to feed the stalks of grain being transported by the conveyor 36 to the threshing opening 7a. The front rotor 26 is located between the end of the conveyor 36 and the threshing opening 7a. The front rotor 26 has a roughly cylindrical rotor body 27, also called a beater, and a front rotor shaft 28 (see Figure 4) whose axis is oriented in the left-right direction. The stalks of grain transported by the feeder 30 are fed from the end of the conveyor 36 through the threshing opening 7a into the threshing chamber 7b of the threshing unit 7 by the front rotor 26.

[0027] The conveyor 36 inside the feeder house 35 has a harvesting unit input shaft (feeder house conveyor shaft) 38, which is located at the front of the threshing unit 7 and has its axial direction in the left-right direction, as a drive shaft that pivots at the end of the feeder house. The rear end of the feeder 30 is supported so as to be rotatable relative to the traveling machine body 2, with the harvesting unit input shaft 38 as the pivot axis. In addition, a lifting cylinder 39 (see Figure 1), which is a hydraulic cylinder, is interposed between the lower surface of the feeder house 35 and the machine frame 6.

[0028] The harvesting unit 3 is designed to move up and down by the rotation of the feeder 30 relative to the traveling machine body 2, which occurs as a result of the extension and retraction of the lifting cylinder 39. The height of the harvesting unit 3 is adjusted by the lifting and lowering of the harvesting unit 3, with the harvesting unit input shaft 38 as the pivot axis. The lifting and lowering of the harvesting unit 3 is operated by a predetermined operating unit provided on the driver's unit 15.

[0029] The threshing section 7 and the sorting section 8 will now be described. The threshing section 7 has a threshing drum 40 located in a threshing chamber 7b with a threshing opening 7a facing forward, and a receiving net 42 positioned below the threshing drum 40. The threshing chamber 7b is formed by a machine frame 21 provided on the machine frame 6.

[0030] The threshing drum 40 is rotatably supported by a threshing drum shaft 41 whose axis is oriented in the front-rear direction. As shown in Figure 5, the threshing drum 40 has a cylindrical main body with the threshing drum shaft 41 aligned along its central axis, and a plurality of threshing drum rods 40a protrude from the outer circumferential surface of the main body. On the upper side of the threshing drum 40, a plurality of dust supply valves 22 for adjusting the conveying speed (residence time) of the threshed grain in the threshing chamber 7b are provided so as to be angle-adjustable relative to the top surface 7c of the threshing chamber 7b. The receiving net 42 is for allowing the grain to leak out and is provided so as to be along the outer circumferential surface of the lower part of the threshing drum 40.

[0031] The sorting unit 8 includes an oscillating sorting device 43, which is positioned below the threshing unit 7 via a receiving net 42, an oscillating mechanism 44 including an oscillating shaft 44a, a first conveyor 45, a second conveyor 46, and a winnowing machine 47 (see Figure 5). The oscillating mechanism 44 rotates the oscillating shaft 44a with rotational power from a drive source, causing the oscillating sorting device 43 to oscillate back and forth in a predetermined direction which is the front-to-back direction in a plan view. A secondary winnowing machine 71 is provided as a pre-fan in front of and above the winnowing machine 47. A second fan 72 is provided behind the winnowing machine 47, in a position between the first conveyor 45 and the second conveyor 46 in the front-to-back direction.

[0032] The oscillating sorting device 43 has a configuration for specific gravity sorting, which includes an upper grain pan 111, a chaff sieve 120 positioned behind the upper grain pan 111 to adjust the amount of grain that leaks out (the amount that falls out) for rough sorting, a lower grain pan 112 positioned below the chaff sieve 120, and a grain sieve 130 positioned below the chaff sieve 120.

[0033] The first conveyor 45 is positioned within the first trough 45b, which extends in the machine width direction, to collect the first grain (first grade). The second conveyor 46 is positioned behind the first conveyor 45 and is positioned within the second trough 46b, which extends in the machine width direction, to collect the second grain (second grade). The winnowing machine 47 blows sorting air to the oscillating sorting device 43, which exits from the front lower to the rear upper.

[0034] A return conveyor 48 is provided on the right side of the machine body where the threshing section 7 and sorting section 8 are located (see Figure 4). The return conveyor 48 is connected to the second conveyor 46 with its lower end positioned near the second conveyor 46, and its upper end is positioned near the front end of the threshing drum 40, extending in an upward sloping manner. To the right of the return conveyor 48 is a vertically extending grain lifting conveyor 49. The grain lifting conveyor 49 transports the first grain, which has been sent by the first conveyor 45, into the grain tank 10.

[0035] The combine harvester 1, having the configuration described above, raises the harvesting unit 3 to a desired height (the harvesting height of the grain stalks) relative to the ground by the raising and lowering motion of the feeder 30, with the harvesting unit input shaft 38 as the central pivot shaft, in the field, and moves from a non-working state to a working state, in which state it moves on the traveling machine body 2. As a result, the combine harvester 1 separates the harvested crop into those to be harvested and those not to be harvested by the left and right dividers 33, 33, and while the pod-bearing portion of the grain stalks to be harvested is raked in by the raking reel 34, the pod-bearing portion of the grain stalks is cut by the cutting blade device 32.

[0036] The podded portions of the grain stalks, harvested at the desired cutting position, are raked into the platform 31 by a rotating auger 37. The auger 37's feeding action also gathers the stalks near the intake of the feeder house 35 within the platform 31, where they are then drawn into the feeder house 35. The grain stalks drawn into the feeder house 35 are then transported by a conveyor 36 through the feeder house 35 to the threshing opening 7a by the front rotor 26, and supplied to the threshing unit 7.

[0037] The podded portions of the grain stalks supplied to the threshing unit 7 are threshed by the threshing unit 7. Specifically, the grain stalks supplied to the threshing unit 7 are conveyed backward by the rotating threshing drum 40, and are threshed mainly between the threshing drum 40 and the receiving screen 42. Threshed grains smaller than the mesh size of the receiving screen 42 leak through the receiving screen 42. Straw and other debris that do not leak through the receiving screen 42 are discharged into the field through the dust outlet 8a (see Figure 5) located at the rear of the sorting unit 8 by the conveying action of the threshing drum 40.

[0038] Meanwhile, the grains that have been threshed in the threshing section 7 and have leaked out of the receiving screen 42 are sorted in the sorting section 8. Specifically, the threshed grains that have been threshed in the threshing drum 40 and have leaked out of the receiving screen 42 are sorted into fine grains (first grade), grains with stems and other parts attached and mixed with straw (second grade), and straw scraps, etc., by the specific gravity sorting action of the oscillating sorting device 43 and the wind sorting action of the winnowing machine 47, and then removed.

[0039] The grain (first-grade) that falls from the oscillating sorting device 43 after sorting in the sorting section 8 is transported to the grain tank 10 by the first conveyor 45 and the connected lifting grain conveyor 49. The second-grade grain is returned to the threshing start end of the threshing drum 40 by the second conveyor 46 and the connected return conveyor 48, where it undergoes threshing again. Straw and other debris are discharged into the field through a dust discharge port located at the rear of the sorting section 8.

[0040] Next, the power transmission configuration of the combine harvester 1 according to this embodiment will be explained with reference to Figure 4. The combine harvester 1 uses the rotational power of the engine 25 to drive the harvesting unit 3, the traveling unit 4, the threshing unit 7, the sorting unit 8, and the grain storage unit 9.

[0041] 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 sorting section 8, and the harvesting section 3. The rotational power of the second output shaft 25b is transmitted to the grain storage section 9. The engine 25 also has a work equipment pump shaft that drives a charge pump 54 which operates the lifting cylinder 39 and the like.

[0042] Regarding the power transmission system to the running section 4, the rotational power of the first output shaft 25a is transmitted to the HST input shaft 52 by the first belt transmission mechanism 51 and input to the transmission 53, which includes the running HST and the turning HST. Here, "HST" refers to a hydraulic continuously variable transmission that employs a method of converting hydraulic pressure generated by driving a hydraulic pump back into rotational force using a hydraulic motor. The driving force of the transmission 53 rotates the drive sprocket 5a of the crawler section 5 that constitutes the running section 4.

[0043] Regarding the power transmission system to the threshing unit 7, the rotational power of the first output shaft 25a is transmitted to the threshing unit input shaft 56 by the second belt transmission mechanism 55. The second belt transmission mechanism 55 is provided with a threshing clutch 57 that transmits the rotational power of the first output shaft 25a to the threshing unit input shaft 56 intermittently as needed.

[0044] The rotational power of the threshing unit input shaft 56 is transmitted to the threshing drum input shaft 59 by the third belt transmission mechanism 58. The rotational power of the threshing drum input shaft 59 is transmitted to the threshing drum shaft 41 via the threshing speed change device 60, through a first bevel gear 115 fixed to the threshing drum input shaft 59 and a second bevel gear 116 fixed to the threshing drum shaft 41. The threshing speed change device 60 performs a two-stage speed change, for example, between high speed and low speed, for the rotational power input from the threshing drum input shaft 59 to the threshing drum shaft 41.

[0045] With this configuration, the driving force of the engine 25 is transmitted to the threshing unit 7. Then, by operating the work clutch lever provided on the driver's unit 15, the threshing clutch 57 is turned ON / OFF, thereby intermittently transmitting power to the threshing unit 7.

[0046] Regarding the power transmission system to the sorting section 8, the threshing section input shaft 56 has a support shaft for the winnowing machine 47, and the rotational power of the threshing section input shaft 56 is transmitted by the fourth belt transmission mechanism 61 to a pulley rotating body 63 supported on the threshing intermediate shaft 62. The rotational power of the pulley rotating body 63 is transmitted to the auxiliary winnowing machine 71 and the winnowing machine 47 by a predetermined transmission mechanism. In addition, the rotational power of the threshing section input shaft 56 is transmitted by a predetermined transmission mechanism to the rotating shafts of the first conveyor 45, the second fan 72, and the second conveyor 46, respectively.

[0047] The rotational power of the first conveyor 45 is transmitted to the grain lifting conveyor 49 by a predetermined transmission mechanism. The rotational power of the second conveyor 46 is transmitted to the oscillating shaft 44a of the oscillating mechanism 44 by the fifth belt transmission mechanism 64. The rotational power of the second conveyor 46 is transmitted to the return conveyor 48 via a bevel gear.

[0048] Regarding the power transmission system to the harvesting unit 3, the rotational power of the pulley rotating body 63 is transmitted to the front rotor shaft 28 by the sixth belt transmission mechanism 73. The sixth belt transmission mechanism 73 is equipped with a harvesting clutch 75 that transmits the rotational power of the pulley rotating body 63 to the front rotor shaft 28 intermittently as needed. The rotational power of the front rotor shaft 28 is transmitted to the harvesting unit input shaft 38 by the first chain transmission mechanism 65. The rotational drive of the harvesting unit input shaft 38 operates the conveyor 36 inside the feeder house 35.

[0049] The rotational power of the harvesting unit input shaft 38 is transmitted to the PF (platform) drive shaft 67 via the second chain transmission mechanism 66. The rotational power of the PF drive shaft 67 is transmitted to the PF auger shaft 37a, which rotates the raking auger 37, via the third chain transmission mechanism 68. The rotational power of the PF drive shaft 67 is also transmitted to the cutting blade drive shaft 32a, which drives the cutting blade device 32, via the seventh belt transmission mechanism 69. Furthermore, the rotational power of the PF drive shaft 67 is transmitted to the reel shaft 34b, which rotates the raking reel 34, via the fourth chain transmission mechanism 76, which includes the reel counter shaft 70.

[0050] With this configuration, the driving force of the engine 25 is transmitted to the harvesting unit 3. Then, by operating the work clutch lever provided on the driver's unit 15, the harvesting clutch 75 is turned ON / OFF, and the power transmission to the harvesting unit 3 is interrupted.

[0051] Regarding the power transmission system to the grain storage section 9, the rotational power of the second output shaft 25b is transmitted to the lower discharge conveyor 11 by a power transmission mechanism including the grain tank intermediate shaft 77, and the rotational power of the lower discharge conveyor 11 is transmitted to the vertical conveying conveyor 12 via bevel gears. The rotational power of the vertical conveying conveyor 12 is transmitted to the grain discharge conveyor 13 by a predetermined transmission mechanism. The grain storage section 9 is equipped with a suction fan 78 and a compressor 79, which are driven by the rotational power transmitted from the grain tank intermediate shaft 77.

[0052] As described above, the combine harvester 1 according to this embodiment includes a threshing unit 7 for threshing crops and an oscillating sorting device 43 for sorting the threshed material from the threshing unit 7. The combine harvester 1 also includes a winnowing machine 47 in the sorting unit 8 that blows sorting air to the oscillating sorting device 43, and a secondary winnowing machine 71 located higher than the winnowing machine 47 that blows sorting air to the oscillating sorting device 43. The oscillating sorting device 43 includes a chaff sieve 120 for sorting the threshed material, a grain sieve 130 located below the chaff sieve 120 for sorting the threshed material sorted by the chaff sieve 120, and a lower grain pan 112 located between the chaff sieve 120 and the grain sieve 130, which is a grain pan that receives the threshed material that leaks down from the chaff sieve 120.

[0053] Thus, the combine harvester 1 is configured as a threshing apparatus that includes a winnowing machine 47 and a secondary winnowing machine 71 that send sorting air to an oscillating sorting device 43 for sorting the threshed material (hereinafter also simply referred to as "processed material") that has leaked down from the receiving net 42 of the threshing chamber 7b, and a grain sieve 130 that allows the first batch of material to leak down from the oscillating sorting device 43. The configuration of the sorting section 8 will be explained below with reference to Figures 5 to 11.

[0054] The oscillating sorting device 43 has a frame 140 that is configured to be roughly rectangular in shape with the front-to-back direction as the longitudinal direction when viewed from above, and the oscillating sorting plate that oscillates in the front-to-back direction when viewed from above. The frame 140 has left and right side plates 141, a front plate portion 142 provided between the front ends of the left and right side plates 141, and a rear plate portion 143 provided between the rear ends of the left and right side plates 141, and these plate portions are configured to be roughly rectangular in shape.

[0055] The side plate 141 is a long plate-shaped member with its longitudinal direction in the front-to-back direction. In a side view, its upper edge is horizontal, and its lower front edge is sloped upwards. The side plate 141 has a vertical surface with its thickness direction in the left-to-right direction, and has an inner surface 141a and an outer surface 141b. Various sorting components that constitute the oscillating sorting device 43 are provided between the left and right side plates 141.

[0056] As shown in Figure 7, the oscillating sorting device 43 is installed between the left and right side plate sections 139 that extend from the threshing section 7 to the sorting section 8. The oscillating sorting device 43 is installed so that the left and right side plates 141 of the frame 140 are positioned parallel to the side plate sections 139 and near the left and right inner sides of the side plate sections 139.

[0057] The frame 140 is connected to the rocking mechanism 44 at the lower rear end. The operation of the rocking mechanism 44 causes the frame 140 and the various sorting components supported therein to rock together as a single unit.

[0058] An upper grain pan 111 is provided at the front end between the left and right side plates 141. The upper grain pan 111 has a main body portion 111a made up of a substantially horizontal plate-shaped member that is installed between the left and right side plates 141. The upper grain pan 111 is installed in a state where it is fixed to the left and right side plates 141 by fasteners such as bolts or by welding.

[0059] A guide plate 111b that acts on the grain is erected on the main body 111a of the upper grain pan 111. Behind the main body 111a, a sieving section 111c is provided, which forms the rear part of the upper grain pan 111, and is made up of multiple sieving wires arranged in a comb-like pattern, forming a narrow, straight plate-like section, and extends backward (upward and diagonally backward). The multiple sieving wires that make up the sieving section 111c are arranged in parallel with a predetermined interval between them in the left-right direction. The upper grain pan 111 receives the processed material that falls from the receiving net 42 and moves it backward while leveling the processed material as the oscillating sorting device 43 oscillates.

[0060] A lower grain pan 112 is provided below the upper grain pan 111 and below the front part of the chaff sieve 120. The lower grain pan 112 is a bent plate-shaped member installed between the left and right side plates 141. Plate-shaped mounting pieces 112c are provided on the left and right edges of the lower grain pan 112 for fixing the lower grain pan 112 to the left and right side plates 141, 141. The lower grain pan 112 is fixed to the left and right side plates 141, 141 by fasteners such as bolts or pins that pass through the mounting pieces 112c, or by welding, with the left and right mounting pieces 112c aligned along the inner surface 141a of the side plate 141.

[0061] The lower grain pan 112 has a front grain pan portion 112a, a rear grain pan portion 112b that forms an obtuse angle with the front grain pan portion 112a, and a rear inclined surface portion 112d that forms an obtuse angle with the rear grain pan portion 112b, and these surfaces form a bent shape when viewed from the side. The front grain pan portion 112a is the portion that slopes downward towards the rear along the slope of the front-upward edge of the front lower side of the side plate 141 when viewed from the side, and forms the front part of the lower grain pan 112. The rear grain pan portion 112b is located below the front of the chaff sieve 120 and is provided horizontally, forming the rear part of the lower grain pan 112. In the vertical direction, the rear grain pan portion 112b is located at approximately the same height as the upper end of the winnowing machine 47. The rear inclined surface portion 112d is the part that forms the rear end of the lower grain pan 112, and is formed as an inclined surface portion that is slightly tilted upward at the rear side of the rear grain pan portion 112b.

[0062] The lower grain pan 112 has its front portion positioned below the rear of the main body portion 111a of the upper grain pan 111 in the front-rear direction, and its rear portion extends further back than the upper grain pan 111.

[0063] In the vertical direction, a chaff sieve 120 is provided at a height between the upper grain pan 111 and the lower grain pan 112. The chaff sieve 120 is configured to roughly sort the processed material and adjust the amount of material that leaks out, and has a plurality of fins, which are chaff fins 121.

[0064] The chaff fin 121 is a narrow, rectangular plate-shaped member with its longitudinal direction running horizontally, and is installed between the left and right side plates 141 in a forward-sloping orientation. Multiple chaff fins 121 (for example, more than twenty) that make up the chaff sieve 120 are arranged in parallel with a predetermined interval between them. The chaff sieve 120 is configured to allow adjustment of the inclination angle of the multiple chaff fins 121.

[0065] The chaff sieve 120 has its front chaff fins 121 positioned near the rear end of the upper grain pan 111, and its rear chaff fins 121 positioned behind the rear end of the grain sieve 130. As the oscillating sorting device 43 oscillates, the chaff sieve 120 sieves the material sent from the upper grain pan 111, separating it by specific gravity and separating grain from impurities.

[0066] As shown in Figure 6, a front guide plate section 145 is provided, which forms a downward sloping surface towards the first conveyor 45, extending from the lower rear of the chaff sieve 120 to the lower part of the grain sieve 130. The front guide plate section 145 is made up of a metal plate-like member or a rubber sag made of an elastic material such as rubber. The threshed grain (first batch) that falls from the grain sieve 130 is guided to the first conveyor 45 by the front guide plate section 145.

[0067] Behind the chaff sieve 120, there are two straw racks 135, a front straw rack 135A and a rear straw rack 135B. The two straw racks 135 are located at the rear or rear end between the left and right side plates 141. The straw rack 135 is composed of a plurality of straw rack members 136 that are spaced apart at predetermined intervals in the left-right direction.

[0068] The straw rack member 136 is a plate-shaped member with a zigzag-like uneven shape on its upper side, and is installed with its front end fixed to a support member 137 that is installed between the left and right side plates 141. The straw rack member 136 of the rear straw rack 135B extends to the rear and is longer in front-to-back length than the straw rack member 136 of the front straw rack 135A. The front end of the straw rack member 136 of the rear straw rack 135B is located below the rear end of the straw rack member 136 of the front straw rack 135A, and the front and rear straw racks 135 are installed to be continuous in the front-to-back direction.

[0069] The straw rack 135 performs specific gravity separation on the threshed grain sent from the chaff sieve 120. The straw rack 135 is configured to allow secondary materials (such as grains with stems and ear fragments) that are lighter in specific gravity than the grain to flow down, while also sending the discarded straw and other materials outside the machine.

[0070] Below the front and rear straw racks 135, there is a rear guide plate section 146 that forms a downward sloping surface towards the second conveyor 46. The rear guide plate section 146 is made up of metal plate-like members or rubber sags made of elastic material such as rubber. The threshed grain that falls from the straw racks 135 is guided to the second conveyor 46 by the rear guide plate section 146.

[0071] The grain sieve 130 receives the grain threshed by the threshing unit 7 and is installed in the oscillating sorting device 43 as a sieve for sorting the first grain. Above the grain sieve 130 is a chaff sieve 120 having multiple chaff fins 121, and the grain sieve 130 further sorts the processed material sorted by the chaff sieve 120. The grain sieve 130 is located above the first conveyor 45 and distributes the processed material to be transported to the first conveyor 45 and the second conveyor 46.

[0072] As shown in Figures 6 and 7, the grain sieve 130 is a substantially flat plate-shaped member with a substantially rectangular plate-like outer shape. The grain sieve 130 has a width dimension (dimension in the left-right direction) corresponding to the distance between the left and right side plates 141, 141, and is provided in a range that extends substantially across the entire distance between the left and right side plates 141, 141 in the left-right direction.

[0073] The grain sieve 130 includes a plate-shaped grain sieve body portion 161 through which numerous holes 163 for sorting materials are formed. The grain sieve body portion 161 is a flat, porous portion that makes up substantially the entire grain sieve 130, which has a rectangular outer shape, and has an upper surface 161a and a lower surface 161b as plate surfaces.

[0074] Numerous holes 163, which serve as openings, are formed through most of the grain sieve body 161, excluding the front and rear edges. These numerous holes 163 are basically arranged in a two-dimensional grid along the rectangular outer shape of the grain sieve 130. The grain sieve 130 allows grain to fall into the grain tank 10 through the holes 163, while leaving other impurities on the grain sieve 130. The holes 163 have an opening shape that is roughly square or roughly rectangular with rounded corners. However, the opening shape of the holes 163 is not particularly limited.

[0075] The grain sieve 130 has a front edge 162 and a rear edge 164 in the grain sieve body 161, which are areas where the holes 163 are not formed. The front edge 162 and the rear edge 164 are plate-like portions that are provided with a substantially constant width over the entire width direction (left-right direction) of the grain sieve 130. Vertical bars 165 are provided on the left and right sides of the lower surface 161b of the middle part of the grain sieve body 161 in the width direction. The vertical bars 165 are straight members that run along the front-rear direction in a plan view, have a substantially U-shaped cross-section with the lower side open, and are fixed to the lower surface 161b of the grain sieve body 161 by welding or the like (see Figure 10). In addition, through-type openings aligned with the holes 163 are formed in the portions of the vertical bars 165 that correspond to each hole 163.

[0076] The grain sieve 130 has its front end positioned below the rear end of the rear grain pan portion 112b of the lower grain pan 112. The grain sieve 130 also has its rear end positioned below and near the rear end of the chaff sieve 120.

[0077] In the grain sieve 130, a front bent surface portion 166 is formed on the front side of the grain sieve body portion 161, which is bent downward at a right angle from the front end of the front edge portion 162 (see Figure 8). Also, on both the left and right sides of the grain sieve body portion 161, lateral bent surface portions 167 are formed, which are bent downward at a right angle from the left and right ends of the grain sieve body portion 161. Furthermore, a rear bent surface portion 168 is formed on the rear side of the grain sieve body portion 161, which is a bent portion that forms a roughly L shape in side view (see Figure 9). The rear bent surface portion 168, as a portion that forms a roughly L shape in side view, has a vertical surface portion 168a that is bent downward at a right angle from the rear end of the rear edge portion 164 of the grain sieve body portion 161, and a horizontal surface portion 168b that is bent rear at a right angle from the lower end of the vertical surface portion 168a.

[0078] The support configuration of the grain sieve 130 in the oscillating sorting device 43 will now be described. The grain sieve 130 is supported on both the front and rear sides and on both the left and right sides by a front support portion 171, a rear support portion 172, and left and right lateral support portions 173, 173. The grain sieve 130 and its support configuration are configured symmetrically or substantially symmetrically.

[0079] At the front support section 171, the grain sheave 130 fixes and supports the front edge 162 of the grain sheave main body 161 with respect to the rear edge of the lower grain pan 112 via the beam member 180 and the left and right support brackets 200 which act as support members.

[0080] The beam member 180 is a straight member having approximately the same dimensions as the lower grain pan 112 in the left-right direction, and is provided to extend almost the entire distance between the left and right side plates 141, 141. The beam member 180 is a bent plate-like member having a certain cross-sectional shape, and together with the rear edge of the lower grain pan 112, forms a roughly rectangular cylindrical space 181 with both the left and right sides open (see Figure 8).

[0081] As shown in Figure 8, the beam member 180 has the following surfaces forming its cross-sectional shape: a front fixed surface 182 along the lower surface of the rear grain pan portion 112b of the lower grain pan 112; a front side surface 183 bent obtusely downward from the rear end of the front fixed surface 182; a bottom surface 184 bent at a right angle to the rear from the lower end of the front side surface 183; a rear side surface 185 bent at a right angle upward from the rear end of the bottom surface 184; and a rear fixed surface 186 bent at a right angle to the rear from the upper end of the rear side surface 185, along the lower surface of the rear inclined surface 112d of the lower grain pan 112. The beam member 180 has a roughly hat shape in a side cross-sectional view (as a cross-sectional shape) due to these surfaces.

[0082] The beam member 180 is fixed to the lower grain pan 112 by welding or the like to the rear grain pan portion 112b and the rear inclined surface portion 112d of the lower grain pan 112, respectively, to the front fixed surface portion 182 and the rear fixed surface portion 186 of the lower grain pan 112. A cylindrical space portion 181 is formed by the front side portion 183, the bottom portion 184 and the rear side portion 185 of the beam member 180 fixed to the lower grain pan 112, the rear edge portion of the rear grain pan portion 112b and the front edge portion of the rear inclined surface portion 112d.

[0083] The beam member 180 is provided with screw members 187 for receiving the support brackets 200. Two screw members 187 are provided for each support bracket 200 at predetermined intervals in the left-right direction, for a total of four locations. The screw members 187 are, for example, welding bolts, which penetrate the bottom surface 184 of the beam member 180, with a disc-shaped head 187a fixed to the upper side of the bottom surface 184 by welding, and a threaded portion 187b protruding downward from the bottom surface 184.

[0084] As shown in Figures 8 and 10, the support bracket 200 is a member formed by bending a strip-shaped plate member having a predetermined width into a predetermined shape. The support bracket 200 has, as its bent form, an upper fixed surface portion 201 that follows the lower surface of the bottom surface portion 184 of the beam member 180, side portions 202 that are bent diagonally downward to the left and right outward from both ends of the upper fixed surface portion 201, and a lower fixed surface portion 203 that is bent at an obtuse angle to the left and right outward from the lower ends of each side portion 202 and follows the upper surface of the front edge portion 162 of the grain sheave main body portion 161. The support bracket 200 has a substantially hat shape as a bent form due to these surfaces.

[0085] The support bracket 200 is fixed to the beam member 180 with its upper fixing surface 201 overlapping the bottom surface 184 from below. The support bracket 200 is fastened and fixed to the beam member 180 at two points on the left and right by nuts 188 that are screwed into the protruding portions of the threaded parts 187b that extend downward from the upper fixing surface 201.

[0086] The support bracket 200 is fastened and fixed to the grain sheave 130 by bolts 205, with the left and right lower fixing surfaces 203 overlapping the front edge 162 of the grain sheave body 161 from above. The bolts 205 pass through the front edge 162 of the grain sheave body 161 and the lower fixing surfaces 203 of the support bracket 200 from below and are screwed into nuts 204 provided on the upper side of the lower fixing surfaces 203.

[0087] As described above, the inlet 230 is provided with support brackets 200 that support the grain sheave 130 relative to the lower grain pan 112. The support brackets 200 are fixed to the beam member 180 and the grain sheave 130, respectively. The support brackets 200 are provided at two locations on both the left and right sides between the beam member 180 and the front edge 162 of the grain sheave 130 (see Figure 10). The support brackets 200 have a dimension of approximately 1 / 3 of the left-right dimension of the grain sheave 130 in the left-right direction, and each support bracket 200 is positioned within a dimension range of approximately 1 / 3 of the left and right sides of the grain sheave 130. In the area where the support bracket 200 is positioned between the beam member 180 and the grain sheave 130, a roughly trapezoidal space 206 is formed as a space enclosed by the support bracket 200 and the grain sheave main body 161, with both the front and rear sides being open and the upper fixed surface 201 and the grain sheave main body 161 serving as the upper and lower bases, respectively.

[0088] In this configuration, where a support bracket 200 is interposed between the lower grain pan 112 and the grain sieve 130 that form the inlet 230 at the front support section 171, the left and right side portions 202 of each support bracket 200 exist as parts that are installed between the beam member 180 and the grain sieve 130. The side portions 202 of the support bracket 200 act as straightening plates that act on the sorting air from the winnowing machine 47 passing through the inlet 230.

[0089] The side portion 202 of the support bracket 200 is a plate-like portion with its surface aligned in the front-to-back direction and its thickness direction roughly aligned in the left-to-right direction. In the support bracket 200 that forms a roughly trapezoidal space 206 as described above, the side portion 202 is an inclined surface that is tilted with respect to the vertical direction. This is merely an example, but in the view shown in Figure 10, the angle that the side portion 202 makes with respect to the vertical direction is about 10°. Note that the side portion 202 may also be a vertical surface aligned with the vertical direction. The side portions 202 are provided in a total of four locations by the two support brackets 200 interposed between the beam member 180 and the grain sheave 130. The four side portions 202 are provided so that their external shapes in side view match, that is, so that their entirety overlaps each other in side view.

[0090] The rear support section 172 is provided with a support beam 210 that supports the rear end of the grain sieve 130. The support beam 210 is installed horizontally between the left and right side plates 141, 141. Thus, the support section that supports the rear of the grain sieve 130 is provided as a beam-like portion installed between the left and right side plates 141, 141 of the oscillating sorting device 43.

[0091] The support beam 210 is a straight member extending in the left-right direction, a bent plate-like member having a certain cross-sectional shape, and is installed between the left and right side plates 141. The support beam 210 has a cross-sectional surface that forms the shape of its cross-section, which includes an upper support surface 211 that receives the fixation of the grain sheave main body 161, a rear surface 212 that is bent downward at a right angle from the rear end of the upper support surface 211, and a lower surface 213 that is bent forward at a right angle from the lower end of the rear surface 212. The support beam 210 has a roughly "J" shaped cross-section due to these surfaces.

[0092] The upper support surface 211 is a downward-sloping surface that follows the downward-sloping incline of the grain sheave 130. The lower surface 213 has a length that extends forward from the rear surface 212 that is approximately 1 / 3 to 1 / 2 the length of the upper support surface 211.

[0093] The support beam 210 has rectangular projections 214 that protrude outwards to the left and right at both left and right ends of the upper support surface 211 (see Figure 7). The projections 214 are provided in such a manner that they partially protrude outwards to the left and right from the front and rear intermediate portions of the upper support surface 211. The support beam 210 is fixed to the left and right side plates 141 by welding or the like, with the projections 214 inserted into narrow rectangular openings 141c formed through the left and right side plates 141 and the left and right end faces in contact with the inner surfaces 141a. In the support beam 210, a space 215 is formed where three sides are surrounded by the rear, rear surface 212 and bottom surface 213 of the upper support surface 211, and both left and right sides are closed by the side plates 141 (see Figure 9).

[0094] The grain sheave 130 is fastened and fixed to the support beam 210 by bolts 216, with the rear edge 164 of the grain sheave body 161 overlapping the upper support surface 211 of the support beam 210 from below, and the rear bent surface 168 positioned within the space 215. The bolts 216 penetrate the rear edge 164 and the upper support surface 211 from below and are screwed into nuts 217 provided on the upper side of the upper support surface 211.

[0095] Between the bolt 216 and the rear edge 164 of the grain sheave body 161, the L-shaped fitting 218, which is aligned with the rear edge 164 and the lateral curved surface 167 of the grain sheave body 161, has its surface 218a aligned with the rear edge 164 interposed with the bolt 216 passing through it. The fixing points of the grain sheave 130 to the support beam 210 by the bolt 216 are provided at two locations on both the left and right ends of the support beam 210 (see Figure 7).

[0096] In the lateral support section 173, the grain sheave 130 is fixedly supported to the lower ends of the left and right side plates 141 via lateral support brackets 220. The lateral support brackets 220 are provided for approximately one-quarter of the front portion of the grain sheave 130 that extends downward from the side plate 141. In the side plate 141, along the lower edges of the main body portion of the side plate 141, which form the inner surface 141a and outer surface 141b, a lower bent surface portion 141d is formed with a predetermined width, which is bent perpendicularly inward to the left and right main body portion of the side plate 141.

[0097] The lateral support bracket 220 is a bent plate-shaped member whose longitudinal direction is in the front-rear direction and which has a crank-shaped bend when viewed from the rear. The lateral support bracket 220 has, as its bent shape, an upper vertical surface portion 221 that follows the outer surface 141b of the side plate 141, a horizontal surface portion 222 that is bent at a right angle inward to the left and right from the lower end of the upper vertical surface portion 221 and follows the lower surface of the lower bent surface portion 141d of the side plate 141, and a lower vertical surface portion 223 that is bent at a right angle downward from the left and right inner ends of the horizontal surface portion 222 and follows the lateral bent surface portion 167 of the grain sheave 130. The upper vertical surface portion 221 and the lower vertical surface portion 223 are surfaces whose left-right direction is the thickness direction, and the horizontal surface portion 222 is a surface whose up-down direction is the thickness direction.

[0098] In the lateral support bracket 220, the lateral surface portion 222 is provided to form a horizontal surface. The lower vertical surface portion 223 has an inclined edge that follows the downward slope of the front of the grain sheave 130 so that its lower edge coincides with the lower edge of the lateral bent surface portion 167 of the grain sheave 130 in a side view, and a forward-sloping inclined edge that coincides with the front edge of the support bracket 200 in a side view, and has a substantially triangular shape in a side view.

[0099] The lateral support bracket 220 is integrally provided with the grain sheave 130 by fixing its lower vertical surface portion 223 to the lateral bent surface portion 167 of the grain sheave 130 from the left and right outer sides by welding or the like.

[0100] The lateral support bracket 220 is fastened and fixed to the side plate 141 by bolts 225, with the upper vertical surface portion 221 overlapping the side plate 141b from the outer surface 141b side and the lateral surface portion 222 overlapping the lower curved surface portion 141d from below. The bolts 225 penetrate the upper vertical surface portion 221 and the side plate 141 from the left and right outer sides and are screwed into nuts 226 provided on the inner surface 141a side of the side plate 141. The fixing parts by bolts 225 are provided at two locations, front and rear, on the upper edge of the lateral support bracket 220 (see Figure 7). In the lateral support bracket 220, the lower vertical surface portion 223 is the part that extends downward from the side plate 141, and the grain sheave 130 is fixed to this lower vertical surface portion 223 in such a manner that the lateral curved surface portion 167 is aligned with the lower part of the lower vertical surface portion 223.

[0101] As described above, the grain sieve 130, supported by the front support portion 171, the rear support portion 172, and the left and right lateral support portions 173 on the frame 140, is installed in a downward sloping shape, for example, at an inclination angle of approximately 5 to 10° with respect to the horizontal direction. Note that the support configuration of the grain sieve 130 in the oscillating sorting device 43 is not limited to this embodiment.

[0102] In the sorting section 8 having the above configuration, as shown in Figure 11, an inlet 230 is provided between the lower grain pan 112 and the grain sieve 130 to guide the sorting air from the winnowing machine 47 upwards to the grain sieve 130.

[0103] The grain sieve 130 is positioned with its front end below the rear end of the lower grain pan 112, and is connected and supported to the rear end of the lower grain pan 112 (the rear end of the rear grain pan section 112b) via a support bracket 200 and a beam member 180. In this configuration, a gap exists between the front end of the grain sieve 130 and the rear end of the lower grain pan 112 due to the difference in height (drop) between the two, and this gap serves as an inlet 230 into which the sorting air from the winnowing machine 47 is guided.

[0104] In detail, the inlet 230 is the portion that forms the space between the beam member 180 and the front edge 162 of the grain sheave 130, and is an opening formed by the bottom surface 184 of the beam member 180, the front edge 162 of the grain sheave 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 an inner space 206 of the support brackets 200, a space between the left and right support brackets 200, and a space between the left and right outer side plates 141 of the support brackets 200 (see Figure 10).

[0105] With respect to the area where the inlet 230 is formed, the rear grain pan portion 112b of the lower grain pan 112 extends horizontally forward, and the grain sieve 130 extends inclined upward and backward. In the configuration with the inlet 230, there is a drop (see Figure 11, arrow B1) between the path running along the rear grain pan portion 112b from front to rear and the path running along the grain sieve 130 from front to rear, with the gap forming the inlet 230.

[0106] In this configuration, where an inlet 230 is provided between the lower grain pan 112 and the grain sieve 130, the winnowing machine 47 is positioned so that the sorting air is directed below the lower grain pan 112, which is upstream of the inlet 230, and below the grain sieve 130. That is, as shown in Figure 11, in the sorting section 8, the sorting airflow from the winnowing machine 47 is formed as a first flow (see arrow C1) that flows below the rear grain pan section 112b of the lower grain pan 112, and a second flow (see arrows C2 and C3) that flows below the grain sieve 130. The first flow includes a path portion that passes through the inlet 230 from front to rear.

[0107] Multiple guide plate sections (241-245) are provided as guide sections for forming air passages that guide the sorting air of the winnowing machine 47. Each guide plate section is composed of a plate-like member of a predetermined thickness that is installed between the left and right side plate sections 139 (see Figures 5 and 7), and the guide surface formed by the plate surface of the plate-like member is provided to extend across the entire space between the left and right side plate sections 139 in the left-right direction. Each guide plate section is provided so that its guide surface is perpendicular to the plate surface of the side plate section 139.

[0108] As shown in Figure 11, the first to fifth guide plate sections 241 to 245 are provided as guide plates for guiding the sorting air of the winnowing machine 47.

[0109] The first guide plate portion 241 is a substantially cylindrical surface portion provided to surround most of the winnowing machine 47, excluding the rear lower side (lower right side in Figure 11). The first guide plate portion 241 forms a substantially cylindrical housing space 250 that houses the winnowing machine 47.

[0110] The second guide plate section 242 has an upward-sloping surface, with its front side continuous with the lower end of the first guide plate section 241 and its rear side connected to the front upper end of the first gutter 45b. The rear end of the second guide plate section 242 is located below the front end of the grain sieve 130. The inclination angle of the second guide plate section 242 is approximately the same as the inclination angle of the grain sieve 130.

[0111] The third guide plate section 243 is located above the second guide plate section 242 and is provided as a rearward-sloping surface that is substantially parallel to the second guide plate section 242. The front side of the third guide plate section 243 is connected to the rear end of the first guide plate section 241. The third guide plate section 243 is located below the lower grain pan 112, with its front end positioned below the front-to-rear intermediate section of the front grain pan section 112a and its rear end positioned below the front-to-rear intermediate section of the rear grain pan section 112b. Together with the second guide plate section 242, the third guide plate section 243 forms a rearward-sloping air passage 251 that is continuous with the storage space 250 behind the winnowing machine 47. The air passage 251 is a passage that guides the sorting air from the winnowing machine 47 from the storage space 250 to the space below the grain sieve 130.

[0112] The fourth guide plate portion 244 is provided on the upper side of the third guide plate portion 243 as a downward-sloping surface. The fourth guide plate portion 244 is located near the lower part of the front grain pan portion 112a of the lower grain pan 112 and is provided parallel to the front grain pan portion 112a. The front end of the fourth guide plate portion 244 is positioned in front of the front grain pan portion 112a, and the rear end is positioned below the front-to-rear intermediate part of the rear grain pan portion 112b. The rear end of the fourth guide plate portion 244 is connected to the rear end of the third guide plate portion 243, and together with the third guide plate portion 243, it forms an acute-angled corner in a side view.

[0113] The fifth guide plate surface 245 is located between the second guide plate 242 and the third guide plate 243 in the vertical direction, and is positioned above the rear end of the second guide plate 242. The fifth guide plate surface 245 has a front inclined surface 245a that slopes upward at the rear and a rear inclined surface 245b that slopes downward at the rear, and these surfaces form an obtuse angled bend shape with the upper side convex when viewed from the side. The length of the front inclined surface 245a in a side cross-sectional view is longer than that of the rear inclined surface 245b. In the front-rear direction, the front end of the fifth guide plate surface 245 is positioned slightly behind the rear end of the third guide plate 243, and the rear inclined surface 245b is positioned below the front end of the grain sheave 130.

[0114] As described above, the airflow configuration for the sorting air of the winnowing machine 47 using multiple guide plate sections (241-245) creates a first airflow path (see arrow C1) that flows below the rear grain pan section 112b of the lower grain pan 112, and a second airflow path (see arrows C2 and C3) that flows below the grain sieve 130.

[0115] The first airflow path is an airflow path that passes from airflow path 251 through the space between the rear grain pan section 112b of the lower grain pan 112 and the front inclined surface section 245a of the fifth guide plate surface section 245, through the inlet 230, and through the space above the grain sieve 130 in a rearward and upward direction (see arrow C1). The first flow of sorting air (see arrow C1) is a flow directed towards the rear of the chaff sieve 120.

[0116] The second airflow path includes an airflow path (see arrow C2) that passes from airflow path 251 through the space between the fifth guide plate surface 245 and the grain sieve 130, and through the space below the grain sieve 130 in a diagonal upward and rearward direction, and an airflow path (see arrow C3) that passes from airflow path 251 through the passage 252 between the second guide plate section 242 and the fifth guide plate surface 245, and through the space above the first conveyor 45, and through the space between the grain sieve 130 and the front guide plate section 145 in a diagonal upward and rearward direction. The second flow of sorting air flows toward the front straw rack 135A. In the sorting section 8, a diagonal upward and rearward airflow (see arrow D1) is formed from the second fan 72 toward the rear straw rack 135B.

[0117] As described above, the sorting unit 8 is configured so that the sorting air from the winnowing machine 47 is sent to the space below the lower grain pan 112, which is upstream of the inlet 230, and to the space below the grain sieve 130.

[0118] Furthermore, as shown in Figure 11, the auxiliary winnowing machine 71 is positioned in front of and above the winnowing machine 47, at approximately the same height as the chaff sieve 120, and is located in front of the chaff sieve 120. The sorting air from the auxiliary winnowing machine 71 passes through an air passage 261 for the auxiliary winnowing machine 71, which is provided above the winnowing machine 47, and is guided to the oscillating sorting device 43. The air passage 261 is provided behind the auxiliary winnowing machine 71 so as to communicate with the space where the auxiliary winnowing machine 71 is housed, and has a passage width smaller than the outer diameter of the auxiliary winnowing machine 71 in the vertical direction, and is open in approximately the front-to-back direction. The air passage 261 is formed by a plate-like member having a predetermined shape, which is installed between the left and right side plate sections 139, similar to the guide plate sections (241-245).

[0119] Multiple (three in this embodiment) fixed fins 262 are provided directly in front of the chaff sieve 120. The multiple fixed fins 262 are arranged in a front-to-back configuration, following the continuous arrangement of the multiple chaff fins 121. The fixed fins 262 are narrow rectangular plate-shaped members with the left-to-right direction as their longitudinal direction, and are fixedly installed between the left and right side plates 141 in a forward-sloping orientation. The multiple fixed fins 262 are spaced apart in the front-to-back direction and are positioned at a common height.

[0120] A branching guide section 265 is provided directly in front of the multiple fixed fins 262, which acts on the sorting airflow from the auxiliary winnowing machine 71. The branching guide section 265 is composed of a bent plate-like member of a predetermined shape, which is installed between the left and right side plates 141. The branching guide section 265 is located approximately in the center between the front-to-rear intermediate part of the upper grain pan 111 and the front part of the lower grain pan 112. The branching guide section 265 is located at approximately the same height as the rotation center of the auxiliary winnowing machine 71. In the vertical direction, the rotation axis 71a of the auxiliary winnowing machine 71 is located within the arrangement range of the branching guide section 265.

[0121] The branching guide section 265 has an upper guide surface 265a formed to face the upper grain pan 111, a lower guide surface 265b formed to face the front grain pan section 112a, and a rear guide surface 265c formed to face the foremost fixed fin 262.

[0122] The upper guide surface 265a has a gently sloping inclined surface portion at the rear, with its rear end at approximately the same height as the upper end of the fixed fin 262. The lower guide surface 265b is a surface parallel or approximately parallel to the forward-sloping grain pan portion 112a, with its rear end at approximately the same height as the lower end of the fixed fin 262. The rear guide surface 265c is a surface parallel or approximately parallel to the forward-sloping portion of the fixed fin 262.

[0123] With the above configuration, the auxiliary winnowing machine 71 is positioned above the chaff sieve 120 and between the chaff sieve 120 and the lower grain pan 112 so that sorting air is supplied.

[0124] In other words, as shown in Figure 11, in the sorting section 8, the sorting airflow of the auxiliary winnowing machine 71 is divided into a third flow (see arrow E1) that flows above the chaff sieve 120 and a fourth flow (see arrow E2) that flows between the chaff sieve 120 and the lower grain pan 112. Therefore, the airflow configuration for the sorting air of the auxiliary winnowing machine 71 is divided into a third airflow path that forms the third flow (see arrow E1) and a fourth airflow path that forms the fourth flow (see arrow E2).

[0125] The third airflow path is an airflow path that passes from airflow path 261 through the space between the upper grain pan 111 and the upper guide surface 265a of the branching guide section 265, through the space between the sieve section 111c of the upper grain pan 111 and the multiple fixed fins 262, and then passes through the space above the chaff sieve 120 in a rearward and upward direction (see arrow E1). The third flow of sorting air is a flow that goes rearward along the upper side of the chaff sieve 120.

[0126] The fourth airflow path is an airflow path that passes from airflow path 261 through the space between the front grain pan portion 112a of the lower grain pan 112 and the lower guide surface 265b of the branching guide portion 265, through the space between the front of the multiple fixed fins 262 and the chaff sieve 120 and the rear grain pan portion 112b of the lower grain pan 112, and passes through the space below the chaff sieve 120 toward the rear (see arrow E2). The fourth flow of sorting air is a flow that moves toward the rear along the upper side of the lower grain pan 112 and the lower side of the chaff sieve 120, and merges with the first flow (see arrow C1) behind the lower grain pan 112. Therefore, in the area where the lower grain pan 112 is installed, the rear grain pan portion 112b separates the flow path of sorting air from the winnowing machine 47 and the flow path of sorting air from the auxiliary winnowing machine 71 vertically.

[0127] As described above, the sorting unit 8 is configured so that the sorting air from the auxiliary winnowing machine 71 is sent to the space above the chaff sieve 120 and to the space between the chaff sieve 120 and the lower grain pan 112.

[0128] As shown in Figures 6 and 7, the oscillating sorting device 43 has a lower grain pan 112 located in front of the grain sieve 130 to receive the threshed material that has leaked down from the chaff sieve 120. Behind the lower grain pan 112, there is a sieving section 190 in which a plurality of sieving wire sections 191 are arranged in parallel.

[0129] The sieving section 190 is provided in a range that extends substantially across the entire rear grain pan section 112b of the lower grain pan 112 in the left-right direction (see Figure 7). Therefore, the sieving section 190 is provided in a range that extends substantially across the entire area between the left and right side plates 141 in the left-right direction. The sieving section 190 is composed of two sieving members 195 arranged adjacent to each other on the left and right sides (see Figure 7).

[0130] The sieving member 195 is a bent plate-shaped member having a predetermined bend shape, and comprises a fixed plate portion 192 and a sieving body portion 193 including a plurality of sieving wire portions 191, and these portions form an obtuse-angled bent line shape when viewed from the side.

[0131] The fixed plate portion 192 is a rectangular plate-shaped portion with its longitudinal direction running horizontally, and its horizontal dimension is approximately half the horizontal dimension of the grain sieve 130. The sieve body portion 193 has a base portion 194 that forms the front edge of the sieve body portion 193 and a plurality of sieve wire portions 191 that extend rearward from the base portion 194, and has a comb-like shape.

[0132] The base portion 194 is a plate-shaped part formed in the same area as the fixed plate portion 192 in the left-right direction, and forms the extended base of a plurality of sieve wire portions 191. The base portion 194 is connected to the rear side of the fixed plate portion 192 and together with the fixed plate portion 192 forms an obtuse-angled bent surface portion. The sieve wire portion 191 is a narrow, straight portion extending from the base portion 194 in a predetermined direction. The plurality of sieve wire portions 191 are formed in the same plane as the base portion 194 and are arranged in parallel with predetermined intervals in the left-right direction.

[0133] The sieving member 195, which constitutes the sieving section 190, has a fixing plate portion 192 fixedly supported on the rear edge of the lower grain pan 112, that is, on the rear edge of the rear grain pan portion 112b. The sieving member 195 is fixed to the lower grain pan 112 by bolts 196 with the fixing plate portion 192 superimposed on the rear edge of the lower grain pan 112. The bolts 196 pass through the fixing plate portion 192 of the sieving member 195 and the rear edge of the lower grain pan 112, and are screwed into a nut portion 197 provided on the back (underside) of the rear grain pan portion 112b (see Figure 8). The nut portion 197 is located in a cylindrical space portion 181 provided by a beam member 180 on the underside of the rear grain pan portion 112b. In each sieve member 195, the fixing points by bolts 196 are provided at three locations in the left-right direction: both ends and the center of the fixing plate portion 192.

[0134] The sieve section 190 has multiple sieve wire sections 191 positioned between the front of the grain sieve 130 and the front-to-back intermediate section of the chaff sieve 120. In the sieve section 190, the multiple sieve wire sections 191 are arranged in an upward sloping manner so as to be approximately parallel to the grain sieve 130. In the example shown in Figure 6, the angle that the multiple sieve wire sections 191 make with respect to the horizontal direction is, for example, about 10°. The magnitude of the inclination angle of the sieve wire sections 191 with respect to the horizontal direction is not particularly limited.

[0135] The sieve section 190 is provided so as to overlap with the grain sieve 130 when viewed from above (see Figure 7). In the front-to-back direction, the sieve section 190 is provided so that the tips (rear ends) of the multiple sieve wire sections 191 are positioned above the front of the grain sieve 130, and it extends over approximately one-quarter of the front of the grain sieve 130. The extension length of the multiple sieve wire sections 191 is not particularly limited. In the left-to-right direction, the sieve section 190 extends over approximately the entire grain sieve 130.

[0136] As described above, in the oscillating sorting device 43, a sieving section 190 is provided above the front of the grain sieve 130, consisting of two sieving members 195 attached to the rear side of the lower grain pan 112. In this embodiment, the sieving section 190 is composed of two sieving members 195 arranged adjacent to each other on the left and right, but the number of sieving members 195 constituting the sieving section 190 is not limited. The sieving section 190 may be composed of a single sieving member or of three or more sieving members.

[0137] Furthermore, the sorting section 8 has the following configuration regarding the arrangement of the sieving section 190 provided on the rear side of the lower grain pan 112.

[0138] As shown in Figure 6, the sorting section 8 is equipped with a first conveyor 45 located below the grain sieve 130. The first conveyor 45 is a screw conveyor that extends in the width direction of the machine to collect the first grain, and has a rotating shaft 45a with the left-right direction as its axis, and a helical blade section 45c provided around the axis of the rotating shaft 45a. In this configuration in which the first conveyor 45 is located below the grain sieve 130, the sieving section 190 is provided so as to be located above the first conveyor 45.

[0139] The sieve section 190 has the front part of the grain sieve 130 interposed between it and the first conveyor 45. In the front-rear direction, the rotation axis 45a of the first conveyor 45 is located at the rear of the group of sieve wires 191 of the sieve section 190. Also in the front-rear direction, the sieve section 190 is installed so that most or all of the group of sieve wires 191 is located within the outer diameter range of the first conveyor 45. In the front-rear direction, the front end of the first conveyor 45 is located near the base end (front end) of the sieve wires 191, and the rear end of the first conveyor 45 is located near the tip end (rear end) of the sieve wires 191.

[0140] According to the combine harvester 1 of this embodiment, which has the above configuration, the sorting unit 8 can suppress the deterioration of sorting accuracy that occurs with increasing amounts of threshed material, and can maintain sorting performance regardless of the amount of threshed material being processed.

[0141] In the oscillating sorting device 43, an inlet 230 is formed to take in sorting air from the winnowing machine 47 and guide it to the space above the winnowing machine 130 by creating a drop (see Figure 11, arrow B1) between the front of the grain sieve 130 and the lower grain pan 112. Furthermore, as sorting air passages for the winnowing machine 47, air passages are formed to send sorting air to the space below the lower grain pan 112 and the space below the winnowing machine 130. As sorting passages for the auxiliary winnowing machine 71, air passages are formed to send sorting air to the space above the chaff sieve 120 and the space between the chaff sieve 120 and the lower grain pan 112.

[0142] With this configuration, the sorting air from the winnowing machine 47, which forms the lower air passage in the sorting section 8, can be divided into upper and lower sections upstream of the grain sieve 130, creating a flow of sorting air directed towards the rear on both the upper and lower sides of the grain sieve 130. Similarly, the sorting air from the auxiliary winnowing machine 71, which forms the upper air passage in the sorting section 8, can be divided into upper and lower sections upstream of the chaff sieve 120, creating a flow of sorting air directed towards the rear on both the upper and lower sides of the chaff sieve 120. This allows for improved sorting efficiency and accuracy of processed materials while maintaining a compact structure, compared to, for example, a configuration that sends sorting air to only one side of the grain sieve 130, either the lower or upper side.

[0143] Furthermore, at the rear of the inlet 230, the drop at the rear of the lower grain pan 112 causes the processed material to fall from the lower grain pan 112 onto the grain sieve 130, creating a floating state for the processed material. By applying the sorting air from the winnower 47 to this floating processed material as it falls, the processed material becomes easier to separate, improving the separation of hulls and dust. As a result, the sorting efficiency and sorting accuracy of the processed material can be improved despite the compact structure.

[0144] Furthermore, the rear grain pan section 112b separates the airflow path from the winnowing machine 47 and the airflow path from the auxiliary winnowing machine 71, allowing the airflow from each to be effectively directed onto the material being processed. This improves the sorting efficiency and accuracy of the material being processed.

[0145] Furthermore, in the oscillating sorting device 43, a sieving section 190, in which multiple sieving wire sections 191 are arranged in parallel, is provided on the rear side of the lower grain pan 112 so as to overlap with the grain sieve 130 when viewed from above. With this configuration, the sieving section 190 acts on the processed material leaking from the chaff sieve 120 and the processed material being sent from the lower grain pan 112 above the front part of the grain sieve 130, and sieving sorting is performed in conjunction with the oscillating sorting device 43. This makes it possible to efficiently remove straw and other debris, and effectively improve the sorting efficiency and sorting accuracy of the processed material.

[0146] Furthermore, the sieve section 190 is positioned above the first conveyor 45. With this configuration, the processed material that leaks down from the lower grain pan 112 through the sieve section 190 can be directly supplied to the first conveyor 45 via the grain sieve 130 as its main flow. This suppresses grain stagnation and effectively improves the sorting efficiency and accuracy of the processed material.

[0147] Furthermore, the inlet 230 is provided with a bent plate-shaped support bracket 200 that supports the front end of the grain sieve 130 relative to the lower grain pan 112. With this configuration, the inlet 230 can be provided between the lower grain pan 112 and the grain sieve 130 with a simple structure while ensuring sufficient airflow area for the inlet 230.

[0148] Furthermore, the support bracket 200 has left and right side portions 202 that function as rectifier plates. With this configuration, the sorting air from the winnower 47 passing through the inlet 230 from front to back can be rectified at the inlet 230. This allows the sorting air from the winnower 47 to act effectively on the material being processed, improving the sorting efficiency and accuracy of the material being processed.

[0149] (A modified version of the sorting section) A modified configuration of the sorting unit 8 according to this embodiment will be explained with reference to Figure 12.

[0150] As shown in Figure 12, in this modified example, a branch air passage 270 is provided between the winnowing machine 47 and the lower grain pan 112. This branch air passage 270 branches off from the air passage 251 that carries the sorting air from the winnowing machine 47 to the grain sieve 130 and guides the sorting air from the winnowing machine 47 towards the lower grain pan 112. The branch air passage 270 is located at the rear of the upper part of the winnowing machine 47.

[0151] The branch air passage 270 is formed as a rearward-sloping air passage continuous with the containment space 250 by the front branch guide plate section 271 and the rear branch guide plate section 272, which are rearward-sloping surface sections that face each other. The branch air passage 270 is a passage that guides the sorting air from the winnowing machine 47 from the containment space 250 to the space below the lower grain pan 112.

[0152] The branch air passage 270 has an opening on its upstream side (lower side) facing directly behind the containment space 250, and an opening on its downstream side (upper side) facing directly below the front end of the rear grain pan portion 112b of the lower grain pan 112. The upstream opening of the branch air passage 270 is formed between the rear end of the first guide plate portion 241 and the third guide plate portion 243, in a manner in which the front part of the third guide plate portion 243 has been cut off. The downstream opening of the branch air passage 270 is formed by dividing the fourth guide plate portion 244 into a front portion 244a and a rear portion 244b, in a manner in which the front and rear middle portions of the fourth guide plate portion 244 have been cut off.

[0153] The front branching guide plate section 271 has its lower end connected to the rear end of the first guide plate section 241 and its upper end connected to the rear end of the front part 244a of the fourth guide plate section 244. The rear branching guide plate section 272 has its lower end connected to the front end of the third guide plate section 243 and its upper end connected to the front end of the rear part 244b of the fourth guide plate section 244.

[0154] The front branch guide plate section 271 and the rear branch guide plate section 272 are both composed of plate-like members of a predetermined thickness that are installed between the left and right side plate sections 139 (see Figures 5 and 7), and are provided so as to extend across the entire space between the left and right side plate sections 139. In other words, in this modified example, in addition to the first to fifth guide plate sections 241 to 245, the front branch guide plate section 271 and the rear branch guide plate section 272, which form the branch air passage 270, are provided as guide plate sections that guide the sorting air of the winnowing machine 47.

[0155] This is just one example, but the front branch guide plate section 271 and the rear branch guide plate section 272 are provided with an inclination angle of approximately 50 to 60° with respect to the horizontal direction.

[0156] As described above, with the configuration that includes the branched air passage 270, as shown in Figure 12, the flow of sorting air from the winnowing machine 47 is separated into a main flow (see arrow F1) and a branched flow (see arrow F2) that passes through the branched air passage 270. This first flow (see arrow C1 in Figure 11) that flows below the rear grain pan section 112b of the lower grain pan 112.

[0157] Therefore, in this modified example, a flow of sorting air from the auxiliary winnowing machine 71 is formed above the rear grain pan section 112b (see arrow E2), and a flow of sorting air from the winnowing machine 47 is formed below the rear grain pan section 112b (see arrow F3). In this modified example as well, in the area where the lower grain pan 112 is installed, the rear grain pan section 112b separates the flow path of sorting air from the winnowing machine 47 and the flow path of sorting air from the auxiliary winnowing machine 71 vertically.

[0158] The sorting air that has passed through the branched air passage 270 passes through the space below the rear grain pan section 112b (see arrow F3), exits the inlet 230, and passes through the space above the grain sieve 130 in a diagonal upward direction (see arrow F4). Therefore, the sorting air that has passed through the branched air passage 270 merges with the sorting air that forms the main flow (see arrow F1) near the inlet 230.

[0159] As described above, the sorting section 8 is configured such that the sorting air from the winnowing machine 47 is sent to the space below the lower grain pan 112 by a branch air passage 270, which is provided as an upward branching passage to the air passage 251 formed on the rear side of the winnowing machine 47. In other words, the lower air passage in the sorting section 8 is configured as a main path for sorting air that goes directly from the winnowing machine 47 to the grain sieve 130, and an alternative path (detour) that branches off from the main path by the branch air passage 270, passes through the space below the lower grain pan 112, and rejoins the main flow.

[0160] As described above, with the modified configuration that includes a branched air passage 270, the sorting air from the winnowing machine 47 can be directly guided to the lower side of the lower grain pan 112. This improves the sorting action by the sorting air in the space below the lower grain pan 112 and in the space near the front of the grain sieve 130. As a result, the sorting efficiency and sorting accuracy of the processed material can be improved while maintaining a compact structure.

[0161] The embodiments described above are examples of the present invention, and the present invention is not limited to the embodiments described above. Therefore, even in embodiments other than those described above, various modifications are possible depending on the design, etc., as long as they do not depart from the technical spirit of the present invention. Furthermore, the effects described in this disclosure are merely examples and are not limiting, and other effects may also exist.

[0162] In the embodiment described above, combine harvester 1 is a conventional combine harvester, but the present invention is also applicable to other combine harvesters, such as a self-propelled combine harvester.

[0163] This technology can take the following configurations. Note that the configurations described below can be selected and combined as desired.

[0164] (1) A combine harvester comprising a threshing unit for threshing crops and an oscillating sorting device for sorting the threshed material obtained by the threshing unit, A winnowing machine that blows sorting air onto the aforementioned oscillating sorting device, The system comprises a secondary winnowing machine, which is positioned higher than the winnowing machine and blows sorting air to the oscillating sorting device, The aforementioned oscillating sorting device is A chaff sieve for sorting threshed grain, A grain sieve provided below the chaff sieve, The system includes a grain pan provided between the chaff sieve and the grain sieve to receive threshed material that leaks from the chaff sieve, Between the grain pan and the grain sieve, an inlet is provided to guide the sorting air from the winnowing machine upwards to the grain sieve. The winnowing machine is positioned so that sorting air is directed below the grain pan, which is upstream of the inlet, and below the grain sieve. The auxiliary winnowing machine is positioned above the chaff sieve and between the chaff sieve and the grain pan so that sorting air is blown between them. A combine harvester characterized by the following features. (2) Between the winnowing machine and the grain pan, a branch air passage is provided that branches off from the air passage for sorting air from the winnowing machine to the grain sieve and guides the sorting air toward the grain pan. The combine harvester according to (1) above, characterized in that it is a combination harvester. (3) The rear side of the aforementioned grain pan is provided with a sieving section in which multiple sieving wires are arranged in parallel. The sieve portion is provided so as to overlap with the grain sieve when viewed from above. The combine harvester according to (1) or (2) above, characterized in that it is the same as described above. (4) A first conveyor is provided below the aforementioned grain sieve, extending in the width direction of the machine to collect the first grain, The aforementioned sieving section is positioned above the first conveyor. The combine harvester according to (3) above, characterized in that it is a combination harvester. (5) The inlet is provided with a support member that supports the grain sheave relative to the grain pan. A combine harvester according to any one of the above items (1) to (4), characterized in that it is a combine harvester. (6) The support member has a rectifier plate portion that acts on the sorting airflow. The combine harvester according to (5) above, characterized in that it is a combination harvester. [Explanation of symbols]

[0165] 1 combine harvester 7. Threshing section 43. Oscillating sorting device 45 Conveyor belt number 1 47 Karawinoo 71 Vice-Karangine 112 Lower Glenpan (Glenpan) 120 Chaff Sieve 130 Glen Seeve 190 Phloem 191 Sieve section 200 Support bracket (support member) 202 Side part (straightening plate part) 230 Inlet 270 Branching air duct

Claims

1. A combine harvester comprising a threshing unit for threshing crops and an oscillating sorting device for sorting the threshed material obtained by the threshing unit, A winnowing machine that blows sorting air onto the aforementioned oscillating sorting device, The system comprises a secondary winnowing machine, which is positioned higher than the winnowing machine and blows sorting air to the oscillating sorting device, The aforementioned oscillating sorting device is A chaff sieve for sorting threshed grain, A grain sieve provided below the chaff sieve, The system includes a grain pan provided between the chaff sieve and the grain sieve to receive threshed material that leaks from the chaff sieve, Between the grain pan and the grain sieve, an inlet is provided to guide the sorting air from the winnowing machine upwards to the grain sieve. The winnowing machine is positioned so that sorting air is directed below the grain pan, which is upstream of the inlet, and below the grain sieve. The auxiliary winnowing machine is positioned above the chaff sieve and between the chaff sieve and the grain pan so that sorting air is blown between them. A combine harvester characterized by the following features.

2. Between the winnowing machine and the grain pan, a branch air passage is provided that branches off from the air passage for sorting air from the winnowing machine to the grain sieve and guides the sorting air toward the grain pan. The combine harvester as described in feature 1.

3. The rear side of the aforementioned grain pan is provided with a sieving section in which multiple sieving wires are arranged in parallel. The sieve portion is provided so as to overlap with the grain sieve when viewed from above. A combine harvester according to claim 1 or 2.

4. A first conveyor is provided below the aforementioned grain sieve, extending in the width direction of the machine to collect the first grain, The aforementioned sieving section is positioned above the first conveyor. The combine harvester according to feature 3.

5. The inlet is provided with a support member that supports the grain sheave relative to the grain pan. The combine harvester as described in feature 1.

6. The support member has a rectifier plate portion that acts on the sorting airflow. The combine harvester according to feature 5.

Images