JP7729372B2 - combine - Google Patents

Description

The present invention relates to a combine harvester equipped with a threshing device that threshers grain stalks harvested by a harvesting device.

There is a combine harvester that uses GNSS to measure position coordinates, has a weight measuring device installed in the grain tank that stores the grain, and measures the grain harvest yield from the weight and records it for each location (see Patent Document 1).

Japanese Patent Application Laid-Open No. 2017-018014

Because there is a time lag between when the grain is harvested by the harvesting device and when it is stored in the grain tank, it was necessary to correct the positional information and record the harvest yield, which resulted in complex control.

The present invention therefore provides a combine harvester that reduces the time lag between harvesting and detecting the harvest yield, and can create a yield map with simple control.

The invention described in claim 1 is a combine harvester equipped with a traveling device 4, a harvesting device 15, a threshing device 6, and a GNSS antenna 27. A first grain quantity sensor 55 is provided at the start of conveyance of the first conveying spiral 47, which transports grain and is located below the oscillating sorting shelf 45 of the threshing device 6, to detect the amount of grain. The amount of grain detected by the first grain quantity sensor 55 is linked to the machine position calculated from input from the GNSS antenna 27 and recorded.

According to the invention described in claim 1, by detecting the amount of grain below the oscillating sorting shelf 45, it is less likely that impurities will be mistakenly detected as the amount of grain, and the amount of grain can be measured accurately.

In addition, because the grain quantity is detected at a position where the grains have traveled a short distance from the harvesting device 15, the deviation between the harvesting point and the grain quantity detection point when creating the yield map is small, allowing for the creation of a more accurate yield map with simpler control.

The invention described in claim 2 is a combine harvester described in claim 1 in which the first grain amount sensor 55 is positioned in a position that includes the vicinity of the lower part of the first conveying spiral 47 within the guide 47a of the first conveying spiral 47 within its detection range, and when the grain amount per detection unit time is less than a certain amount, a correction is made to reduce the grain amount by the number of rotations of the first conveying spiral 47 per detection unit time.

According to the invention described in claim 2, by including the lower part of the first conveying spiral 47 in the detection range, detection is possible even when the amount of grain entering is small.

Furthermore, if the amount of grains per detection unit time is less than a certain value, the exposed first conveying spiral 47 will be erroneously detected as a grain, so accuracy can be ensured by making a correction to reduce the amount of grains.

The invention described in claim 3 is a combine harvester equipped with a traveling device 4, a harvesting device 15, a threshing device 6, and a GNSS antenna 27. A first grain quantity sensor 57, consisting of a pressure-sensitive sensor that detects the amount of grain in an inclined position toward the first conveying spiral 47, is installed across the entire width of the oscillating sorting shelf 45 or multiple sensors are installed in the left-right width direction between the oscillating sorting shelf 45 of the threshing device 6 and the first conveying spiral 47 that transports the grain. The first grain quantity sensor 57 is connected to and records the machine position calculated from input from the GNSS antenna 27.

According to the invention described in claim 3, by detecting the amount of grain below the oscillating sorting shelf 45, it is less likely that impurities will be mistakenly detected as the amount of grain, and the amount of grain can be measured accurately.

In addition, because the grain quantity is detected at a position where the grains have traveled a short distance from the harvesting device 15, the deviation between the harvesting point and the grain quantity detection point when creating the yield map is small, allowing for the creation of a more accurate yield map with simpler control.

In addition, by detecting the grains falling from the oscillating sorting shelf 45 by bringing them into contact with the first grain quantity sensor 57, detection misses are less likely to occur and accuracy is improved.

The invention described in claim 4 is a combine harvester described in claim 1, in which the bottom of the guide 47a of the first conveying spiral 47 at the conveying start end side is configured to be vertically movable, a first grain quantity sensor 60 consisting of a weight sensor is provided below the vertically movable portion of the guide 47a, and a covering member 63 made of an elastic material is provided across the vertically movable portion and fixed portion of the guide 47a.

According to the invention described in claim 4, the amount of grain is detected by the load applied near the conveyance start end of the first guide 47a, which reduces detection omissions and improves accuracy.

The invention described in claim 5 is a combine harvester described in claim 1 in which a second grain amount sensor 56 that detects the amount of grain in the second conveying spiral 48, which recovers grains that have fallen from the rear of the oscillating sorting shelf 45, is located at the conveying start end of the second conveying spiral 48, and the amount of grain in the first conveying spiral 47 is corrected by the amount of grain in the second conveying spiral 48.

According to the invention described in claim 5, the amount of grain returned to the oscillating sorting shelf 45 by the second conveying spiral 48 and merged there can be roughly excluded, improving the accuracy of the amount of grain in each location.

1 is a side view of a combine harvester showing an embodiment of the present invention. 1 is a plan view of a combine harvester showing an embodiment of the present invention. 1 is a plan cross-sectional view of a main part of a cabin of a combine harvester showing an embodiment of the present invention. FIG. 1 is a control flow diagram of a combine harvester showing an embodiment of the present invention. 1 is a side cross-sectional view of a main part of a threshing device of a combine showing an embodiment of the present invention. 1 is a side cross-sectional view of the first (second) conveying spiral portion of a combine harvester showing an embodiment of the present invention. FIG. FIG. 10 is an explanatory diagram of the operation of grain amount correction in a combine harvester according to an embodiment of the present invention. FIG. 10 is an explanatory diagram of the operation of grain amount correction in a combine harvester according to an embodiment of the present invention. FIG. 10 is a side cross-sectional view of the main parts of a threshing device of a combine harvester, showing a second embodiment of the present invention. FIG. 10 is a side cross-sectional view of the main parts of a threshing device of a combine harvester, showing a third embodiment of the present invention. FIG. 10 is a plan view of the first (second) conveying spiral portion of a combine harvester, showing a third embodiment of the present invention.

A combine harvester 1, which is one embodiment of the present invention, will be described below with reference to the accompanying drawings. To facilitate understanding, directions are conveniently indicated as follows: from the operator's perspective, the front is the front side, the rear is the rear side, the right hand side is the right side, and the left hand side is the left side; however, the configuration is not limited to these directions.

<Overall configuration of the combine>
1 and 2, the combine harvester 1 has a traveling device 4 mounted on the lower side of a chassis 2 and having a pair of left and right traveling crawlers 3 that travel on the soil surface, and also has a threshing device 6 mounted on the left and right sides of the chassis 2 for threshing and sorting the stalks that are held between feed chains 5 and transported, a grain tank 7 as a storage device for temporarily storing the grain, and a grain discharging auger 8 for discharging the grain stored in the grain tank 7 outside the machine, and a straw disposal device 9 mounted on the rear end of the threshing device 6. The grain discharging auger 8 is raised and lowered by operating an auger lifting cylinder when discharging grain.

Ahead of the threshing device 6, a harvesting device 15 is suspended from the front end of the chassis 2 so that it can be raised and lowered relative to the soil surface using a harvesting lifting cylinder. The harvesting device 15 includes a stalk divider 11 that divides the unharvested stalks from the front end, a raising section 12 that raises the divided stalks, a cutting blade section 13 that cuts the raised stalks, and a supply adjustment and transport section that rakes in the harvested stalks and adjusts the threshing depth during transport before transferring them to the feed chain 5.

The upper rear of the harvesting device 15 is provided with an operating device for controlling the operation of the combine harvester 1, and an operating seat 21 where the operator sits. An engine is mounted below the operating seat 21, and the grain tank 7 is located to the rear. A cabin 23 is provided to cover the operating device and operating seat 21. The traveling device 4, threshing device 6, harvesting device 15, operating device, engine, cabin 23, etc. are mounted on the combine harvester's chassis 2.

A monitor installed inside the cabin 23 displays a grain tank full alarm when the full sensor detects that the grain tank 7 is full of grain, a fuel low alarm when the fuel low sensor detects that there is little fuel remaining in the fuel tank, and various other notifications from the control device.

The operating device includes various operating devices, such as a main speed change lever operated forward and backward by the operator seated in the operating seat 21 to operate the speed change actuator, which switches between forward/reverse travel and stopping and switches the main speed; a left/right traveling actuator operated by tilting left or right to operate the left/right side clutches and left/right side brakes of the left and right traveling crawlers 3, 3, allowing left/right steering when traveling straight and turning in various turning modes; a steering lever operated forward and backward to operate the reaping lifting cylinder to raise and lower the reaping device 15; a reaping/threshing lever that operates the reaping/threshing clutch actuator to turn the power of the reaping device 15 and threshing device 6 on and off; an auger operating lever that moves the threshing auger 8 up and down by operating the auger lifting cylinder and left and right by operating the left/right turning actuator; and an auger drive switch lever that operates the auger drive electromagnetic clutch that turns the power of the threshing auger 8 on and off, discharging grain from the grain tank 7 outside the machine.

A seating sensor is provided in the operator's seat 21 to detect whether the operator is seated or not. If the seating sensor detects that the operator has left the seat and the parking brake is operated and activated, pressing the manual threshing switch will activate only the threshing device 6.

Then, pressing the manual threshing switch again will stop the threshing device 6 from operating.

In addition, when the hand-threshing operation switch is pressed and the threshing device 6 is operating (during hand-threshing operations), if the seating sensor detects that the operator is seated in the operating seat 21, the hand-threshing operation switch will turn OFF, the operation of the threshing device 6 will stop, and the machine will become operable, sounding an alarm device such as a buzzer.

In addition, when the release of the parking brake is detected, the manual threshing switch is turned OFF, the threshing device 6 stops operating, and the machine becomes operable, sounding an alarm device such as a buzzer.

Also, when the emergency stop switch is pressed, the clamping rod cover opens and the engine stops.

In addition, a momentary switch is provided on the main shift lever as an intention device, and the reaping device 15, threshing device 6, and traveling device 4, which are stopped when the seat sensor detects that the operator has left their seat, are only operable while the operator is pressing the momentary switch.

Then, when the seat sensor detects that the worker who pressed the momentary switch to perform the task has returned to his or her seat, the momentary switch is pressed to continue the task.

When the seat sensor detects that the worker is seated, the rotation of the drive unit is dampened, and when the momentary switch is released, it returns to normal.

In addition, when the seat sensor detects that an operator has left their seat, a timer relay is used to delay activation of the PTO interlock (3 seconds before activation after leaving the seat).

Then, by pressing the momentary switch within the grace period, the work can be carried out continuously.

<Cabin 23>
As shown in Figure 3, the cabin 23 is configured in a box shape with a cabin roof 25 attached to the top of a cabin frame 24 whose base is fixed to the chassis 2, and is equipped with a door 26 on the right side that opens and closes at the front, a left glass window on the left side, a windshield window on the front side, and a rear glass window on the rear side, and a GNSS antenna 27 is attached to the top surface of the cabin roof 25.

The control device 31 records map data, calculates the current aircraft position based on input from the GNSS antenna 27, and stores this in the map data in chronological order.

An air conditioning unit 30 is located in the upper left corner of the cabin 23, in the center front-to-rear position. A control device 31 equipped with a GNSS unit as a position information acquisition device is located behind the air conditioning unit 30. An inside/outside air switching unit 32 and a switching electric motor 33 are located behind the operator's seat 21.

Harvesting operations with the combine harvester 1 generate a lot of dust, so the cabin 23 is made more airtight, but when the airtightness is too high, the door 26 becomes difficult to close, resulting in it remaining ajar.

By utilizing the fact that a dust-proof filter is attached to the outside air intake port of the inside/outside air switching unit 32, the inside/outside air switching unit 32 is switched to outside air intake when the door 26 is closed, preventing dust from entering while reducing the airtightness, making the door 26 easier to close and preventing it from being left ajar.

That is, an open/close detection sensor is provided to detect whether the door 26 is open or closed. When the open/close detection sensor detects that the door 26 is open, the control device 31 activates the switching electric motor 33 to switch the inside/outside air switching unit 32 to introduce outside air.

Therefore, when closing the door 26 from an open state, the inside/outside air switching unit 32 is set to introduce outside air, preventing dust from entering while reducing the airtightness, making the door 26 easier to close and preventing it from remaining ajar.

If the air conditioning unit 30 controller is set to inside air intake, after the open/close detection sensor detects that the door 26 is closed, the switching electric motor 33 is activated to switch the inside/outside air switching unit 32 to inside air intake.

When the key switch is OFF, harvesting is not being performed, so the control device 31 operates the switching motor 33 and switches the inside/outside air switching unit 32 to outside air intake, regardless of whether the door 26 is open or closed.

The above-described switching between outside air and inside air by the inside/outside air switching unit 32 can be summarized as shown in the flow diagram in Figure 4.

<Threshing device 6>
As shown in Figure 5, a threshing chamber 40 is provided above the threshing device 6 to thresh the stalks that have been cut by the harvesting device 15 and transported by the feed chain 5, and a threshing drum 41 is mounted within the threshing chamber 40 on a threshing drum shaft 42.

The driving force for the threshing device 6 is input to the threshing cylinder shaft 42 and transmitted to each part of the threshing device 6.

A threshing rotation sensor 43 is installed on the threshing cylinder shaft 42, which detects the drive rotation speed and inputs it into the control device 31.

The lower side of the threshing drum 41 is mainly surrounded by a threshing net 44.

Below the handling net 44 is the transfer shelf 45a, which is the starting end of the oscillating sorting shelf 45 that serves as a sorting device. A sieve 45b that separates grains from foreign objects is provided on the downstream side of the transfer shelf 45a, and a straw rack 45c that can transport straw scraps is provided on the downstream side of the sieve 45b.

A winnowing fan 46 is provided below the transfer shelf 45a of the oscillating sorting shelf 45, and the winnowing fan 46 blows air toward the oscillating sorting shelf 45.

Below the sieve 45b of the oscillating sorting shelf 45, a first conveying spiral 47 is provided to transport the sorted grain to the grain tank 7.

A second conveying spiral 48 is provided below the straw rack 45c at the rear of the oscillating sorting shelf 45 to transport the mixture of straw scraps and grain to the handling chamber 40.

A layer thickness sensor 50, which serves as a grain quantity sensor and detects the layer thickness of grains (material to be processed) on the oscillating sorting shelf 45, is provided in a predetermined position above the oscillating sorting shelf 45, in the center on the left and right.

The layer thickness sensor 50 rotates upward from an initial angle depending on the layer thickness of the grains on the oscillating sorting shelf 45, and sends a detection voltage to the control device 31 according to the rotation angle.

In other words, when the layer thickness of grains on the oscillating sorting shelf 45 is thin (the amount of grains is small), a low detection voltage is sent to the control device 31, and as the layer thickness increases (the amount of grains increases), a high detection voltage is sent.The control device 31 calculates the layer thickness of grains on the oscillating sorting shelf 45 based on the detected voltage from the layer thickness sensor 50.

The control device 31 then controls the wind force of the winnower 46 and the opening degree of the sieve 45b according to the calculated layer thickness of the grains on the oscillating sorting shelf 45 (the larger the detection value of the layer thickness sensor 50 (the thicker the layer thickness), the stronger the wind force of the winnower 46 and the larger the opening degree of the sieve 45b).

As shown in Figures 5 and 6, a first distance sensor 55 is provided at the beginning of the first guide 47a of the first conveying spiral 47 (towards the left outer side of the body of the threshing device 6) as a first grain quantity sensor that detects the distance toward the bottom of the first guide 47a. This sensor detects the height L1 (grain quantity) of the grains within the first guide 47a being conveyed by the first conveying spiral 47 and sends the detected value to the control device 31.

By providing the first distance sensor 55 at the starting end of the first guide 47a of the first conveying spiral 47, the amount of grain can be accurately detected without being affected by changes in layer thickness when grains are discharged from the first conveying spiral 47.

By including the lower part of the first conveying spiral 47 in the detection range, detection is possible even when the amount of grain entering is small.

When the amount of grains in a detection unit time is less than a certain amount, the first distance sensor 55 detects grains at height L2 or less, resulting in a false detection by detecting the first conveying spiral 47. Therefore, a correction is made to reduce the amount of grains by the number of rotations of the first conveying spiral 47 calculated from the drive rotation speed detected by the threshing rotation sensor 43 in the detection unit time.

That is, correction is made as shown in Figure 7.

Therefore, when the amount of grains per detection unit time is less than a certain amount, the first distance sensor 55 detects the first conveying spiral 47, resulting in an erroneous detection of the amount of grains, and this can be corrected, ensuring accuracy.

The control device 31 then records the kernel amount in association with the aircraft position calculated based on input from the GNSS antenna 27.

In addition, a second distance sensor 56 is provided at the beginning of the second guide 48a of the second conveying spiral 48 (towards the left outer side of the threshing device 6 body) as a second grain quantity sensor that detects the distance toward the bottom of the second guide 48a. This sensor detects the height L1 (grain quantity) of the grains within the second guide 48a being conveyed by the second conveying spiral 48 and sends the detected value to the control device 31.

When the amount of grains in a detection unit time is less than a certain amount, the second distance sensor 56 detects grains at height L2 or less, resulting in a false detection by detecting the second conveying spiral 48. Therefore, a correction is made to reduce the amount of grains by the number of rotations of the second conveying spiral 48 calculated from the drive rotation speed detected by the threshing rotation sensor 43 in the detection unit time.

That is, correction is made as shown in Figure 7.

The control device 31 links and records the amount of grain transported by the second transport spiral 48 with the aircraft position calculated based on input from the GNSS antenna 27.

Then, when the control device 31 stores the grain amount in the map data and creates a yield map, it corrects the grain amount of the first conveying spiral 47 with the grain amount conveyed by the second conveying spiral 48, completes the yield map, and stores it.

The means for correcting the amount of grains on the first conveying spiral 47 with the amount of grains conveyed by the second conveying spiral 48 is as shown in Figure 8.

As a result, the amount of grain returned to the oscillating sorting shelf 45 by the second conveying spiral 48 and merged there can be largely excluded, improving the accuracy of the grain amount per location and enabling the creation of an accurate yield map.

Furthermore, because the grain quantity is detected at a position where the grains have traveled a short distance from the harvesting device 15, the deviation between the harvesting point and the grain quantity detection point when creating the yield map is small, allowing for the creation of a more accurate yield map with simpler control.

In addition, if the first distance sensor 55 or second distance sensor 56 detects the amount of grain a predetermined time after the stalk sensor installed in the harvesting device 15 stops detecting stalks, the monitor and alarm device inside the cabin 23 will notify the user that the first distance sensor 55 or second distance sensor 56 is dirty and making an erroneous detection, prompting them to clean it.

Figure 9 shows a second embodiment of a threshing device 6 that uses a first pressure sensor 57 and a second pressure sensor 58 as first grain quantity sensors instead of the first distance sensor 55 and second distance sensor 56 that detect the grain quantity in the first embodiment.

That is, a first pressure sensor 57 is installed below the oscillating sorting shelf 45 and near the top of the first conveying spiral 47, spanning the entire width of the oscillating sorting shelf 45 (the entire width of the threshing device 6), which detects the amount of grain and sends the detected value to the control device 31.

The control device 31 then records the kernel amount in association with the aircraft position calculated based on input from the GNSS antenna 27.

In addition, a second pressure sensor 58 is installed below the oscillating sorting shelf 45 near the top of the second conveying spiral 48, spanning the entire width of the oscillating sorting shelf 45 (the entire width of the threshing device 6), to detect the amount of grain and send the detected value to the control device 31.

The control device 31 links the kernel amount with the aircraft position calculated from input from the GNSS antenna 27 and records it.

As in the first embodiment, when the control device 31 stores the grain quantity in the map data and creates a yield map, it corrects the grain quantity detected by the first pressure sensor 57 with the grain quantity detected by the second pressure sensor 58, completes the yield map, and stores it.

The first pressure sensor 57 and the second pressure sensor 58 are installed at an angle toward the first conveying spiral 47 and the second conveying spiral 48, respectively, to prevent grains from piling up on their upper surfaces.

The first pressure sensor 57 and the second pressure sensor 58 may be small and arranged in a row at equal intervals across the entire width of the oscillating sorting shelf 45.

By detecting grains falling from the oscillating sorting shelf 45 by bringing them into contact with the first pressure sensor 57 and the second pressure sensor 58, detection misses are less likely to occur and accuracy is improved.

Figures 10 and 11 show a third embodiment of a threshing device 6 that uses a first weight sensor 60 and a second weight sensor 61 as first grain quantity sensors instead of the first distance sensor 55 and second distance sensor 56 that detect the grain quantity in the first embodiment.

That is, the first guide 47a of the first conveying spiral 47 is composed of a fixed guide 47b fixed to the threshing frame 6a, and a rotating guide 47c whose starting end (the outer left side of the threshing device 6's body) is connected to the threshing frame 6a by a hinge 62 and whose inner end is free to move up and down; a first weight sensor 60 is provided below the rotating guide 47c.

The rubber plate 63, which serves as a covering member with its base (left outer part) fixed to the threshing frame 6a, extends from the inner surface of the rotating guide 47c to the inner surface of the fixed guide 47b facing inward toward the inside of the machine, sealing the gap between the fixed guide 47b and the rotating guide 47c, preventing grain from leaking out of the first guide 47a even when the rotating guide 47c moves up and down.

Therefore, the amount of grain inside the rotating guide 47c can be detected by weighing it with the first weight sensor 60, and the detected value is sent to the control device 31.

Detection at a single location near the starting end of the first guide 47a of the first conveying spiral 47 allows for a simpler and less expensive configuration than detection at multiple locations.

The control device 31 then records the kernel amount in association with the aircraft position calculated based on input from the GNSS antenna 27.

Similarly, the second guide 48a of the second conveying spiral 48 is composed of a fixed guide 48b fixed to the threshing frame 6a and a rotating guide 48c whose starting end (the outer left side of the threshing device 6's body) is connected to the threshing frame 6a by a hinge 62 and whose inner end is free to move up and down; a second weight sensor 61 is provided below the rotating guide 48c.

The rubber plate 63, whose base (left outer part) is fixed to the threshing frame 6a, extends from the inner surface of the rotating guide 48c to the inner surface of the fixed guide 48b facing inward, sealing the gap between the fixed guide 48b and the rotating guide 48c, preventing grain from leaking out of the second guide 48a even when the rotating guide 48c moves up and down.

Therefore, the amount of grain inside the rotating guide 48c can be detected by weighing it with the second weight sensor 61, and the detected value is sent to the control device 31.

The control device 31 links the kernel amount with the aircraft position calculated from input from the GNSS antenna 27 and records it.

As in the first embodiment, when the control device 31 stores the grain amount in the map data and creates a yield map, it corrects the grain amount detected by the first weight sensor 60 with the grain amount detected by the second weight sensor 61, completes the yield map, and stores it.

Detecting the amount of grains using the load applied near the conveying start end of the first guide 47a and second guide 48a reduces missed detections and improves accuracy.

Furthermore, by comparing the amount of grain calculated by the first weight sensor 60 and the second weight sensor 61 with the amount of grain on the oscillating sorting shelf 45 detected by the layer thickness sensor 50, it is possible to grasp the flow of grain (sorted material) within the threshing device 6, enabling control to be implemented to improve threshing performance (sorting performance).

In other words, if the amount of grain calculated by the first weight sensor 60 and the second weight sensor 61 is less than the amount of grain on the oscillating sorting shelf 45 detected by the layer thickness sensor 50, the control device 31 determines that there is a lot of straw dust, etc., and controls the winnower 46 to increase its wind force.

In addition, if the amount of grain calculated by the first weight sensor 60 and the second weight sensor 61 and the amount of grain on the oscillating sorting shelf 45 detected by the layer thickness sensor 50 are both large, the control device 31 determines that there is little straw dust, etc., and controls the winnower 46 to reduce its wind force.

In addition, if the amount of grain calculated by the first weight sensor 60 and the second weight sensor 61 is greater than the amount of grain on the oscillating sorting shelf 45 detected by the layer thickness sensor 50, the control device 31 determines that an abnormality has occurred, issues an alarm, and limits the vehicle speed, thereby preventing damage to the threshing device 6 and preventing grain loss.

4 Traveling device 6 Threshing device 15 Harvesting device 27 GNSS antenna 45 Swinging sorting shelf 47 First conveying spiral 47a Guide (first guide)
48 Second conveying spiral 55 First grain quantity sensor (first distance sensor)
56 Second grain quantity sensor (second distance sensor)
57 Number one grain quantity sensor (number one pressure sensor)
60 Number one grain quantity sensor (number one weight sensor)
63 Covering member (rubber plate)

Claims (5)

A combine harvester equipped with a traveling device (4), a reaping device (15), a threshing device (6) and a GNSS antenna (27),
A combine harvester characterized in that a first grain quantity sensor (55) for detecting the amount of grain is provided at the starting end of the first conveying spiral (47) for conveying grains, which is provided below the oscillating sorting shelf (45) of the threshing device (6), and the amount of grain detected by the first grain quantity sensor (55) is linked to the machine position calculated from input from the GNSS antenna (27) and recorded. The combine harvester described in claim 1 is characterized in that the first grain quantity sensor (55) is positioned in a position that includes within its detection range the vicinity of the lower part of the first conveying spiral (47) within the guide (47a) of the first conveying spiral (47), and when the grain quantity per detection unit time is less than a certain value, a correction is made to reduce the grain quantity by the number of rotations of the first conveying spiral (47) per detection unit time. A combine harvester equipped with a traveling device (4), a harvesting device (15), a threshing device (6), and a GNSS antenna (27), characterized in that a first grain quantity sensor (57) consisting of a pressure-sensitive sensor that detects the amount of grain in an inclined position toward the first conveying spiral (47) is installed across the entire width of the oscillating sorting shelf (45) between the top and bottom of the oscillating sorting shelf (45) of the threshing device (6) and the first conveying spiral (47) that transports the grains, or multiple first grain quantity sensors are installed in the left and right width directions, and the amount of grain detected by the first grain quantity sensor (57) is linked to the machine position calculated from input from the GNSS antenna (27) and recorded. The combine harvester described in claim 1, characterized in that the bottom of the guide (47a) of the first conveying spiral (47) at the conveying start end side is configured to be vertically movable, a first grain quantity sensor (60) consisting of a weight sensor is provided below the vertically movable portion of the guide (47a), and a covering member (63) made of an elastic material is provided across the vertically movable portion and fixed portion of the guide (47a). The combine harvester described in claim 1, characterized in that a second grain amount sensor (56) that detects the amount of grain in the second conveying spiral (48), which recovers grain that has fallen from the rear of the oscillating sorting shelf (45), is located at the conveying start end of the second conveying spiral (48), and the amount of grain in the first conveying spiral (47) is corrected by the amount of grain in the second conveying spiral (48).