Threshing apparatus for combine harvester

Abstract

To provide a thresher of a combine harvester, which can efficiently apply the blast of a winnower to threshed products on a sorting shelf to prevent the deterioration of sorting performance, even when the amount of reaped grain culms is increased.SOLUTION: In the thresher of a combine harvester, a threshing chamber 10 and a sorting chamber 20 are installed in a thresher 4, grain culms handled by a threshing cylinder 11 in the threshing chamber 10 are dropped from a receiving net 12 onto a shaking sorter 21 in the sorting chamber 20, and blast generated from a winnower 25 installed in the front lower part is sent to the shaking sorter 21 to sort grains from threshed products. This thresher is provided with a shielding plate 29 for dividing the blast of a winnower 25 installed at the front lower part of a shaking separator 21 to the side of a transfer shelf 26A by an upper wind dividing 21A and closing a gap between the bottom surface of the shaking separator 21 and the upper surface of the upper wind dividing 26A.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a threshing device of a combine that cuts cereal stalks growing in a field to harvest grains. [Background technology]

[0002] As described in Patent Publication No. 2021-132599, the threshing device of a combine harvester sends the stalks cut by the harvesting device at the front of the machine to the threshing device, where the stalks are threshed by handling them with a threshing drum in the threshing chamber to produce threshed grain, and then sorts the threshed grains from the threshed grains using a swinging sorting device in the sorting chamber, and the grains are stored in a grain tank for harvesting. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2021-132599 Summary of the Invention [Problem to be solved by the invention]

[0004] The oscillating sorting device in the sorting room is equipped with a sorting shelf that oscillates back and forth to receive the thawed grains and a winnower that blows air onto the sorting shelf.The oscillating air separates and sorts the grains as the thawed grains on the sorting shelf oscillate, but if a large amount of thawed grains accumulates on the sorting shelf, it becomes difficult for the sorting air to reach all areas, and sorting efficiency decreases.

[0005] The present invention aims to prevent a decline in sorting performance in a threshing device of a combine harvester by efficiently applying the air blown by a winnower to threshing grains on a sorting rack even when the amount of harvested stalks increases. [Means for solving the problem]

[0006] The above-mentioned object of the present invention is achieved by the following technical means.

[0007] The invention of claim 1 is a threshing device for a combine harvester which has a handling chamber 10 and a sorting chamber 20 within the threshing device 4, and drops the stalks handled by the threshing drum 11 in the handling chamber 10 from the receiving net 12 onto the oscillating sorting device 21 in the sorting chamber 20, and sends the airflow generated from the winnower 25 located in front and below to the oscillating sorting device 21 to sort the grains from the threshing device, characterized in that the airflow from the winnower 25 located in front and below the oscillating sorting device 21 is diverted to the transfer shelf 21A side by an upper air splitter 26A, and a shielding plate 29 is provided to block the gap between the bottom of the oscillating sorting device 21 and the top of the upper air splitter 26A.

[0008] The invention of claim 2 provides the threshing device for a combine according to claim 1, characterized in that the shielding plate 29 is provided before the sorting net 21E of the oscillating sorting device 21.

[0009] The invention described in claim 3 is the threshing device for a combine according to claim 1, characterized in that the shielding plate 29 is provided below the gathering plate 24 provided on the transfer shelf 21A of the oscillating sorting device 21.

[0010] The invention of claim 4 is a threshing device for a combine as described in claim 1, characterized in that a guide plate 23 is provided in front of the chaff sieve 21B of the oscillating sorting device 21, followed by a shielding plate 29, and is inclined after being erected toward the transfer shelf 21A.

[0011] The invention described in claim 5 is the threshing device for a combine described in claim 4, characterized in that the guide plate 23 is provided in an upright position approximately directly above the shielding plate 29.

[0012] The invention of claim 6 is the threshing device for a combine according to claim 1, characterized in that the shielding plate 29 is an elastic plate whose lower end abuts against the upper surface of the upper divider 26A. [Effects of the Invention]

[0013] In the invention of claim 1, the grains threshed by the threshing drum 11 in the threshing chamber 10 and the removed grains such as stalks fall from the receiving net 12 onto the oscillating sorting device 21, where the grains are sorted by the shaking action and the air blown from the winnower 25.Even if the air blown toward the transfer shelf 21A, which is diverted by the upper air divider 26A, is blocked by the removed grains accumulating on the transfer shelf 21A, the air does not escape backward due to the upper air divider 26A and the shielding plate 29 provided on the bottom of the oscillating sorting device 21, and instead acts to blow upward on the removed grains on the transfer shelf 21A, maintaining good sorting performance, so that sorting performance does not decrease even if the amount of harvested stalks increases.

[0014] According to the invention of claim 2, the diverted airflow of the winnower 25 directed toward the transfer shelf 21A by the upper air splitter 26A does not flow into the sorting net 21E and impair sorting.

[0015] In the invention of claim 3, the diverted airflow from the winnower 25 directed toward the transfer shelf 21A by the upper air splitter 26A is sent to the gathering plate 24 of the transfer shelf 21A, promoting left and right leveling of the grain being removed and improving sorting.

[0016] In the invention of claim 4, the air flow that is guided by the shielding plate 29 and enters the oscillating sorting device 21 does not flow toward the chaff sieve 21B side due to the guide plate 23, but instead acts as a blowing force on the grain on the transfer shelf 21A, thereby maintaining good sorting.

[0017] According to the invention of claim 5, the air sent into the oscillating sorting device 21 by the shielding plate 29 is directed toward the transfer shelf 21A by the guide plate 23 without being disturbed, thereby improving the transport of degrain on the transfer shelf 21A.

[0018] According to the invention of claim 6, the interference between the oscillating oscillating separator 21 and the upper air splitter 26A is alleviated, thereby effectively preventing the escape of airflow. [Brief explanation of the drawings]

[0019] [Figure 1] 1 is a front view of a combine harvester according to an embodiment of the present invention. FIG. [Figure 2] FIG. [Figure 3] FIG. [Figure 4]FIG. [Figure 5] This is an oblique view of the right front of the combine harvester body. [Figure 6] This is an oblique view of the left front body of the combine harvester. [Figure 7] FIG. 2 is a right side view of the combine harvester. [Figure 8] FIG. 2 is a left side view of the combine harvester. [Figure 9] FIG. 1 is a front view of a combine harvester. [Figure 10] FIG. 2 is a right-front perspective view showing the transmission mechanism around the combine body. [Figure 11] FIG. 2 is a right side view showing the transmission mechanism on the right side of the combine body. [Figure 12] FIG. 2 is a left side view showing the transmission mechanism on the left side of the combine body. [Figure 13] FIG. 2 is a front view showing the transmission mechanism at the front of the combine body. [Figure 14] FIG. 2 is a diagram of the power transmission mechanism of the combine harvester. DETAILED DESCRIPTION OF THE INVENTION

[0020] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

[0021] As shown in Figures 1 to 3, a general-purpose combine harvester has a traveling device 2 consisting of a pair of left and right crawlers that travels on the soil surface on the underside of a body frame 1, a pre-harvesting processing device 3 that harvests stalks in the field on the front side of the body frame 1, a threshing device 4 that threshers and sorts the harvested stalks on the rear left side of the pre-harvesting processing device 3, and a control unit 5 on which an operator sits on the rear right side of the pre-harvesting processing device 3.

[0022] An engine room 6 that houses the engine is provided below the control unit 5, a grain tank 7 that stores threshed and sorted grain is provided behind the control unit 5, and a discharge auger 8 that discharges the grain to the outside is provided behind the grain tank 7.

[0023] The control unit 5 is provided with a threshing clutch lever that turns on and off the drive clutch of the threshing device 4, and the engine will not start unless this threshing clutch lever is turned off, and is also provided with a switch that simultaneously turns on and off the dust collection fan switch, monitor switch, and fullness sensor switch for the grain tank 7.

[0024] In addition, the dust suction fan can be driven when the threshing clutch lever is engaged, but the dust suction fan can be driven when the threshing clutch lever is disengaged, thereby saving power.

[0025] Also, when the threshing clutch lever is engaged, the full-grain tank 7 sensor turns on and a buzzer sounds, and when the threshing clutch lever is disengaged, the buzzer should stop.

[0026] In addition, when the threshing clutch lever is engaged and the grain tank 7's rice-full sensor is turned on, it is advisable to have the monitor's rice-full lamp light up.

[0027] The pre-harvesting processing device 3 is composed of a conveying device 3A that transports the stalks in the field to the rear while standing them up, a cutting blade device 3B that cuts the base of the stalks transported to the rear lower part of the conveying device 3A, an auger device 3C that gathers the stalks transported to the rear side of the conveying device 3A to the left side, and a feeder house 3D that transports the gathered stalks to the threshing device 4.

[0028] As shown in FIG. 4, the threshing device 4 is formed of a threshing chamber 10 for threshing stalks and a sorting chamber 20 for sorting the threshed grains.

[0029] A threshing drum 11 for threshing the stalks transported from the feeder house 3D is installed on the front and rear walls of the threshing chamber 10, and a receiving net 12 formed in a semicircular arc along the lower outer periphery of the threshing drum 11 is installed on the underside of the threshing drum 11. The top of the threshing drum 11 is covered with an openable threshing drum cover 13, and a dust conveying plate 15 is installed on the inner periphery of the threshing drum cover 13 to guide the stalks to the rear of the threshing chamber 10. The threshing drum 11 is supported by a rotor shaft 14 extending in the front-to-rear direction.

[0030] At the top of the sorting chamber 20, a shaking sorting device 21 is provided to sort the grains leaking down from the handling chamber 10.

[0031] The oscillating sorting device 21 is composed of a transfer shelf 21A, a chaff sieve 21B, a straw rack 21C, and a sorting net 21E. The transfer shelf 21A is a tray-shaped member that sends the thawed grains backward and gathers them to the center of the handling chamber 10 with a gathering plate 24, and receives the thawed grains that pass through the receiving net 12 and fall. The chaff sieve 21B has a plurality of sieve plates arranged in parallel at intervals, and is driven to oscillate back and forth, sieving the thawed grains while transporting them backward, and sending them out of the transfer shelf 21A. The grains coming in and those falling directly from the receiving net 12 are sifted, the material falling from the chaff sieve 21B is further sifted, the grains are sorted and dropped by the sorting net 21E, and fine impurities are retained and transported to the rear.The straw rack 21C has multiple upright, plate-like rack plates that extend in the front-to-rear direction and are arranged in parallel with gaps in the width direction, and the upper edge of each is shaped like a sawtooth to release the broken stalks downward and rearward.

[0032] At the bottom of the oscillating sorting device 21, in order from the front, there are provided a winnower 25 that blows sorting air to the oscillating sorting device 21, and behind the winnower 25 there are an upper wind splitter 26A and a lower wind splitter 26B that split the blowing direction of the sorting air into upper, middle and lower, and the air is split and blown to the transfer shelf 21A, chaff sieve 21B and straw rack 21C.

[0033] A shielding plate 29 made of a rubber plate is hung from the oscillating sorting device 21 and placed on the upper surface of the upper wind divider 26A to prevent the upward airflow from leaking backward, and a guide plate 23 is provided in the oscillating sorting device 21 on top of this shielding plate 29, inclining backward in front of the chaff sieve 21B and the sorting net 21E toward the transfer shelf 21A, so that the airflow is directed toward the transfer shelf 21A.

[0034] Furthermore, at the bottom, there is provided a first spiral 27 which transports grains leaking from the oscillating sorting device 21 to the grain tank 7, and a second spiral 28 which sends up and transports grains with attached rachis branches and broken stalks leaking from the rear of the oscillating sorting device 21 to the transfer shelf 21A at the front of the oscillating sorting device 21.

[0035] As shown in Figures 5 and 6, vertical frames 30L and 30R extending upward from the body frame 1 are provided on both sides of the front part of the threshing device 4. As shown in Figure 9, the vertical frame 30L is provided to the left of the left wall of the feeder house 3D, and the vertical frame 30R is provided to the right of the right wall of the feeder house 3D. Also, as shown in Figure 10, an inlet funnel 50 that receives the straw transported by the feeder house 3D is provided between the vertical frames 30L and 30R behind the rear part of the feeder house 3D.

[0036] A cylinder 32 is provided on the front surface of the vertical frames 30L, 30R via a support member 33, and rotatably houses a counter shaft 31 extending in the left-right direction to transmit the output rotation of the engine E to the oscillating sorting device 21, etc.

[0037] Above the counter shaft 31, a cylinder 35 is provided via a support member 36, which rotatably houses an elevator drive shaft 34 that drives an elevator housed in a feeder house 3D extending in the left-right direction and transmits the output rotation of the engine E to the conveying device 3A, etc. The lifting and lowering rotation fulcrum of the pre-harvesting treatment device 3, which is also the lifting and lowering rotation fulcrum of the feeder house 3D, is coaxial with the elevator drive shaft 34 and is formed on the support member 36, resulting in a compact configuration.

[0038] In addition, above the elevator drive shaft 34 on the front side of the vertical frame 30L, a cylinder 38 is provided via a support member 39, which rotatably houses a mowing reversal drive shaft 37 that reverses the driving direction of the pre-mowing processing device 3.

[0039] A cylinder 41 is provided on the front surface of the vertical frame 30R via a support member 42, and rotatably accommodates a handling drum drive shaft 40 extending to the right from the vertical frame 30R to transmit the output rotation of the engine E to the handling drum 11.

[0040] This facilitates the routing of the belt that transmits the output rotation of the engine E. In addition, the cylinder 32 housing the counter shaft 31 and the cylinder 35 housing the elevator drive shaft 34 connect the vertical frames 30L and 30R and also function as strength members that increase the strength of the vertical frames 30L and 30R. This increases the rigidity of the vertical frames 30L and 30R and makes it possible to prevent deformation, etc.

[0041] 7 to 9, in the vertical direction, the counter shaft 31 is disposed above the winnowing shaft 25A of the winnower 25 and below the elevator drive shaft 34 and the threshing drum drive shaft 40, and in the front-to-rear direction, the counter shaft 31 is disposed in front of the winnowing shaft 25A of the winnower 25 and behind the elevator drive shaft 34 and the threshing drum drive shaft 40. This makes it easier to route the belt that transmits the output rotation of the engine E. In particular, since the elevator drive shaft 34 and the threshing drum drive shaft 40 are disposed in a direction away from the vertical frames 30L and 30R and forward, a predetermined gap is created, making it easier to perform maintenance and management of the belt, etc.

[0042] In addition, in the up-down direction, the counter shaft 31 is provided below the rotor shaft 14 and the inlet funnel 50, and in the front-to-rear direction, the counter shaft 31 is provided behind the elevator drive shaft 34 and forward of the front end 14F of the rotor shaft 14 and the front end 50F of the inlet funnel 50. This allows the counter shaft 31 to be provided close to the vertical frames 30L, 30R, which further increases the rigidity of the vertical frames 30L, 30R and makes it possible to better prevent deformation, etc.

[0043] A dust box 51 equipped with a fan for discharging dust adhering to the stalks transported by the elevator to the outside is provided on the upper wall of the feeder house 3D.

[0044] As shown in FIGS. 10 to 13, the left part of the threshing drum drive shaft 40 is connected to the input shaft of a relay box 52 that incorporates a bevel gear or the like that transmits the output rotation of the threshing drum drive shaft 40 to the rotor shaft 14.

[0045] The front part of the winnowing cover 53, which covers the upper, lower and front parts of the winnowing machine 25, is located close to the rear surfaces of the vertical frames 30L and 30R. This allows the sorting chamber 20 to be longer in the front-to-rear direction, and allows sorting air to be efficiently blown from the winnowing machine 25 towards the oscillating sorting device 21. Although the rear surface of the vertical frame 30L and the front part of the winnowing cover 53 are spaced apart in Figure 11, the rear surface of the vertical frame 30L and the front part of the winnowing cover 53 can also be connected.

[0046] The oscillating sorting drive shaft 21'A of the oscillating sorting device 21 is provided behind the second spiral shaft 28A, the first grain lifting duct 54 that lifts grains into the grain tank 7 is provided on the right side of the first spiral 27, and the second grain lifting duct 55 that re-transports second grains such as grains with attached stalks and broken culms to the oscillating sorting device 21 is provided on the right side of the second spiral 28. Note that only the lower part of the first grain lifting duct 54 is shown in Figures 12 and 13.

[0047] As shown in FIG. 14, the output rotation of the engine E is transmitted to the traveling device 2 via a hydraulic continuously variable transmission (HST) 60 and a transmission 61 provided downstream of the transmission path.

[0048] The output rotation of the engine E is transmitted to the counter shaft 31 via the threshing clutch 63 and pulley 31A, which are provided downstream of the transmission path. The output rotation transmitted to the counter shaft 31 is transmitted to the threshing drum drive shaft 40 via pulleys 31B and 40A. The output rotation transmitted to the threshing drum drive shaft 40 is transmitted to the rotor shaft 14 via the relay box 52, causing the threshing drum 11 to rotate.

[0049] The output rotation transmitted to the threshing drum drive shaft 40 is transmitted to the elevator drive shaft 34 via the pulley 40B and the reaping clutch 64 to drive the pre-reaping treatment device 3, such as the feeder house 3D. The forward rotation drive of the pre-reaping treatment device 3 is not output from the counter shaft 31. This reduces the torsional moment applied to the counter shaft 31, thereby suppressing the torsion angle generated in the counter shaft 31.

[0050] The output rotation transmitted to counter shaft 31 is transmitted to elevator drive shaft 34 via pulley 31D and reaping reverse clutch 65, and drives pre-reaping treatment device 3 such as feeder house 3D in the reverse direction opposite to the normal drive direction. As a result, if grain stalks become stuck in pre-reaping treatment device 3, particularly feeder house 3D, the reaping clutch 64 can be disengaged and the reaping reverse clutch 65 can be engaged to drive the elevator etc. in the reverse direction and remove the grain stalks stuck in feeder house 3D.

[0051] The output rotation transmitted to the counter shaft 31 is transmitted via pulley 31E to the winnower 25 to drive the winnower 25, and is transmitted via pulley 31C to the first spiral 27, the second spiral 28, and the oscillating sorting device 21 to drive the first spiral 27, the second spiral 28, and the oscillating sorting device 21. The winnower 25, the first spiral 27, and the second spiral 28 are driven from the counter shaft 31 via a belt, which makes it possible to suppress the transmission of vibrations generated in the oscillating sorting device 21, etc. to the counter shaft 31.

[0052] The output rotation of the engine E is transmitted to the discharge auger 8 via an auger clutch 67 provided downstream of the transmission path, thereby driving the discharge auger 8. [Explanation of symbols]

[0053] 4. Threshing equipment 10 Handling room 11 Thrusting body 12 Receiving net 20 Sorting Room 21. Shaking sorting device 21A Transfer shelf 23 Guide plate 25 Tangji 26A Windward Cutting 29. Shielding panels

Claims

1. A threshing device for a combine harvester has a threshing chamber (10) and a sorting chamber (20) in the threshing device (4), and the stalks threshed by the threshing drum (11) in the threshing chamber (10) are dropped from a receiving net (12) onto a oscillating sorting device (21) in the sorting chamber (20), and the airflow generated from a winnower (25) located in front and below is sent to the oscillating sorting device (21) to sort grains from the threshing device, characterized in that the airflow from the winnower (25) located in front and below the oscillating sorting device (21) is diverted to the transfer shelf (21A) side by an upper air divider (26A), and a shielding plate (29) is provided to close the gap between the bottom of the oscillating sorting device (21) and the top of the upper air divider (26A).

2. 2. A threshing device for a combine harvester according to claim 1, wherein a shielding plate (29) is provided in front of the sorting net (21E) of the swinging sorting device (21).

3. 2. A threshing device for a combine harvester according to claim 1, wherein the shielding plate (29) is provided below the gathering plate (24) provided on the transfer shelf (21A) of the swinging sorting device (21).

4. A threshing device for a combine harvester as described in claim 1, characterized in that a guide plate (23) that stands up and then inclines toward the transfer shelf (21A) is provided in front of the chaff sieve (21B) of the oscillating sorting device (21) and follows the shielding plate (29).

5. 5. A threshing device for a combine harvester according to claim 4, wherein a guide plate (23) is provided in an upright position substantially directly above the shielding plate (29).

6. 2. A threshing device for a combine harvester according to claim 1, wherein the shielding plate (29) is an elastic plate whose lower end abuts against the upper surface of the upper windbreaker (26A).

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