JP6022519B2 - Combine - Google Patents

Description

  The present invention relates to a combine that measures the quality of a grain when the grain is harvested and threshed from a field while traveling, and the obtained grain is stored in a grain tank.

  In the combine by patent document 1, the receiving holding | maintenance part which creates the grain storage space which stores the grain sent to the grain tank temporarily is formed, and of the grain currently stored in the grain storage space Internal quality is measured by an optical internal quality measuring device. The bottom surface of the receiving and holding portion is formed by a swinging open / close bottom plate (shutter). The grains are temporarily stored in the closed state of the bottom plate, and the grains temporarily stored in the open state of the bottom plate are discharged. A supply (storage) state detection sensor that detects that a predetermined amount or more of grains has been stored is provided at the upper end portion inside the receiving and holding unit. In the lower region of the catch holding part, the presence or absence of a grain that detects whether or not the grain is present at the height level on the side wall of the grain tank at a position slightly below the lower end position of the open bottom plate A (grain level) sensor is provided. Every time the supply state detection sensor detects that a predetermined amount or more of the grain has been supplied to the receiving holder, a measurement process is performed by the internal quality measuring device. Then, after the bottom plate is switched to the open state and the grains are discharged, the bottom plate is returned to the closed state again, and the grains are stored. As the amount of grain in the grain tank increases, the tip of the bottom plate will eventually be buried in the grain, and the bottom plate cannot be switched from the open state to the closed state. If the presence of the kernel is detected, the measurement process is stopped.

JP 2013-118856 A

  In Patent Document 1, since whether or not a predetermined amount or more of grains suitable for quality measurement is stored in the receiving and holding unit is detected by the storage state detection sensor, quality measurement can be performed when the storage state detection sensor fails. Disappear. For this reason, the technique which can detect the failure of a storage state detection sensor rapidly and reliably is desired.

The combine according to the present invention includes a grain tank that stores the grain that has been conveyed from the threshing apparatus, and a grain discharging apparatus that discharges the grain stored in the grain tank from the bottom of the grain tank to the outside. An upper intake port that is provided in the grain tank and takes in a part of the grain conveyed from the threshing device, and a lower part that discharges the grain taken in from the intake port to the grain tank And a temporary storage part located in the middle of the grain path, and the temporary storage part, and stores the grain taken in from the intake part in the temporary storage part that a reservoir for the closed position, the repositionable reservoir shutter to a discharge-opening position to release the stored cereal kernels from the temporary retention unit, grain to be stored in the temporary storage unit reaches a predetermined amount a storage completion signal to detect the Stored in the kernel tank, a quality measuring unit that detects the quality of the grain stored in the temporary storage unit, a shutter control unit that controls the position changing operation of the storage shutter, and the grain tank. A yield measuring device for measuring the yield of the cereal grains, and the storage amount detector is completed when the storage amount in the temporary storage unit estimated based on the measurement result of the yield measuring device exceeds the predetermined amount A failure determination unit that determines failure of the storage amount detector when no signal is output.

  According to this configuration, the storage amount detector is stored when the grain stored in the temporary storage unit reaches a predetermined amount that is suitable for detecting the quality of the grain by the quality measurement unit, for example. Outputs a completion signal. By utilizing this, the failure determination unit estimates the amount of grains stored in the temporary storage unit, that is, the storage amount, from the measurement result of the yield measuring device, so that the estimated storage amount is If the storage amount detector does not output the storage completion signal even though it exceeds the predetermined amount that is set in advance, it can be considered that the storage amount detector has failed.

  In a preferred embodiment of the present invention, a shutter position detector for detecting a change position of the storage shutter is provided, and the failure determination unit includes a measurement result of the yield measuring device over time and the shutter. A failure of the storage amount detector is determined based on the detection result of the position detector. In this configuration, the timing at which the storage shutter is in the storage closed position, which is the timing at which the grains start to be stored in the temporary storage unit, is accurately detected by the shutter position detector. Thereby, quicker and more accurate determination of the storage amount detector failure is realized.

  In a preferred embodiment of the present invention, the shutter position detector is positioned at the position of the storage shutter even though a control signal for instructing the position change operation of the storage shutter is output from the shutter control unit. Based on the fact that no change is detected, the failure determination unit determines a failure of the storage shutter. Therefore, it is possible to cope with a problem that an appropriate signal is not output from the storage amount detector due to a malfunction of the storage shutter. For example, since the storage shutter cannot be changed to the storage closed position, it is possible to distinguish between a failure of the storage shutter or a failure of the storage amount detector with respect to a phenomenon in which grains are not stored in the temporary storage unit.

  In one of the preferred embodiments of the present invention, the failure determination unit determines that the increase in the yield from the yield when the storage shutter is changed to the storage closed position has reached a predetermined amount. Determine the failure of the quantity detector. Since the increase amount of the grain flowing into the grain tank can be calculated from the measurement result of the yield measurement, if this increase amount is the amount that the storage completion signal must be output from the storage amount detector, It can be considered that the storage volume detector has failed. In addition, since the ratio of passing through the grain path among the grains released from the inflow port can be determined in advance, the relationship between the amount of increase in grain and the storage amount in the temporary storage unit is functionalized or tabulated can do. Therefore, although the amount of grain increase in the grain tank after the storage shutter is closed exceeds the value corresponding to the predetermined amount for which the storage completion signal is output by the storage amount detector, If the storage completion signal is not output, it can be determined that the storage amount detector has failed.

  In another preferred embodiment of the present invention, the storage amount detector continues to output the storage completion signal even after the storage shutter is changed from the storage closed position to the release open position. Thus, the failure determination unit determines a failure of the storage amount detector. In other words, the storage amount detector continues to output the storage completion signal even though the storage shutter is changed from the storage closed position to the release open position, and the grain should have been discharged from the temporary storage section. Even in this case, the failure determination unit can determine that the storage amount detector is defective.

It is a schematic diagram which shows the basic composition for performing the grain quality measurement mounted in a combine. It is a schematic diagram which shows the basic principle of the control which determines the failure of the storage amount detector used at the time of grain quality measurement It is a side view which shows one of the embodiments of the combine by this invention. It is a top view of a combine. It is a cross-sectional top view which shows the front part of the grain tank mounted in the combine. It is a schematic diagram which shows a grain tank inside. It is a vertical side view of a measurement unit when the storage shutter provided in the cylindrical formation body provided in the grain tank is in a closed position. It is a vertical side view of the measurement unit when the storage shutter is in the closed position. It is explanatory drawing explaining attachment of the measurement unit to a grain tank. It is a functional block diagram of the measurement control system built in the combine.

  Before describing a specific embodiment of a combine according to the present invention, a basic configuration for performing grain quality measurement performed in this combine will be described. FIG. 1 schematically shows a grain quality measuring mechanism provided on the wall of the grain tank 16. The measuring unit 30 includes a cylindrical formed body 53 and a quality measuring unit 5. In the upper part of the grain tank 16, an inlet 27 is formed from which the grain conveyed from the threshing device is discharged. The cylindrical formed body 53 has a first wall 531 facing the center side and a second wall 532 facing the wall of the grain tank 16, and creates a grain path 53 </ b> P extending in the vertical direction therein. ing. The upper opening of the grain path 53P functions as an intake 72 for taking in a part of the grain released from the inlet 27, and the lower opening of the grain path 53P is a grain taken from the intake 72. It functions as the discharge port 73 which discharges to the grain tank 16. A temporary storage unit 530 for temporarily storing the captured grain is formed in the middle of the grain path 53P. The temporary storage unit 530 releases the stored grain from the temporary storage unit 530, and the closed storage position for storing the grain taken in from the intake 72 into the temporary storage unit 530. Therefore, a storage shutter 76 that can be changed in position to an open position for discharge that assumes a downward posture is provided.

  The storage shutter 76 is switched to the storage closed position by a close command from the shutter control unit 92 constructed in the measurement control unit 9, whereby the grain is stored in the temporary storage unit 530. When the stored grain reaches an amount appropriate for the quality measurement, the stored amount detector 75 sends a storage completion signal to the measurement control unit 9. In response to the storage completion signal, a measurement start command is sent to the quality measuring unit 5. The quality measuring unit 5 sends a quality value as a measurement result to the measurement control unit 9. Next, the measurement control unit 9 sends a measurement end command to the quality measurement unit 5, and the shutter control unit 92 sends an open command to the storage shutter 76. As a result, the storage shutter 76 is switched to the release open position, and the grains stored in the temporary storage unit 530 are discharged. Such a series of quality measurement processes is repeated during the mowing and threshing process.

  When the grain in the grain tank 16 increases, the upper surface level of the grain approaches the outlet 73 and enters the grain path 53P. When the lower end of the storage shutter 76 enters the grain stored in the grain tank 16 when the storage shutter 76 is in the release open position where the storage shutter 76 is in the downward posture, the storage shutter 76 is loaded and stopped. . Before such a situation occurs, a grain level detector 41 is provided in order to stop the mowing threshing process and / or the grain quality measurement process. The grain level detector 41 detects that the distance between the lower end of the storage shutter 76 and the upper surface level of the grain in the downward posture (here, this distance is defined as the shutter lower distance) has reached a predetermined value. It is configured as follows. Therefore, when the grain level detector 41 detects that the shutter lower distance exceeds a predetermined value, it sends a level excess signal to the shutter control unit 92 as a detection signal. The shutter control unit 92 stops the position changing operation of the storage shutter 76 in response to the signal exceeding the level, and the measurement control unit 9 stops the grain quality measurement process.

  In the example shown in FIG. 1, an optional second kernel level detector 42 is shown in broken lines. In this case, the first grain level detector 41 described above is provided on the first wall 531, and the second grain level detector 42 is provided on the second wall 532. The two kernel level detectors 41 and 42 not only improve the detection reliability, but also estimate the gradient of the upper surface level of the kernel that has entered the kernel path 53P.

  When the storage amount detector 75 that detects that the grain stored in the temporary storage unit 530 has reached an amount appropriate for the quality measurement fails, the storage completion signal cannot be sent, or the storage completion signal Will continue to be sent. Thereby, a grain quality measurement process becomes impossible. Thus, the storage amount detector 75 is an important detector for the grain quality measurement process. The basic principle for detecting the failure detection of the storage amount detector 75 will be described with reference to FIG.

  Although simply depicted in FIG. 2, the configurations of the cylindrical formed body 53 and the storage shutter 76 that create the grain path 53 </ b> P and the temporary storage unit 530 are substantially the same as those in FIG. 1. Instead of omitting the grain level detector 41, a shutter position detector 79 for detecting the change position of the storage shutter 76 is shown. Moreover, the yield measuring device 35 which measures the yield of the grain stored in the grain tank 16 is shown. A failure determination unit 94 that is a core element for detecting a failure of the storage amount detector 75 is constructed in the measurement control unit 9. The failure determination unit 94 is based on the fact that the storage amount detector 75 does not output a storage completion signal even if the storage amount in the temporary storage unit 530 estimated based on the measurement result of the yield measuring device 35 exceeds the predetermined amount. A failure of the storage amount detector 75 is determined.

  An example of the failure determination by the failure determination unit 96 is to determine a failure of the storage amount detector 75 based on the measurement result of the yield measuring device 35 over time and the detection result of the shutter position detector 79. As described with reference to FIG. 1 and as schematically shown in FIG. 2, in the grain quality measurement process, the closing command from the shutter control unit 92 to the storage shutter 76, the storage amount detector 75. A series of control flow is executed in which the storage completion signal from, and the opening command from the shutter control unit 92 to the storage shutter 76 are sequentially repeated through the measurement start and measurement end. During this grain quality measurement process, the yield, which is the measurement result of the yield measuring device 35, is taken into the failure determination unit 94 over time. In FIG. 2, Q1, Q2, Q3, Q4... Are obtained continuously from the time when the closing command is output to the storage shutter 76 at a certain time. The amount of increase in grain from the output of this closing command to a specific time: q is the sum of the amount of increase in grain q1, q2, q3, ... in the grain tank 16 at each yield calculation time. can get. Alternatively, it can be obtained from the difference between the yield at a specific time and the yield at the time when the closing command is output. Since the ratio of passing through the grain path 53P among the grains released from the inflow port 27 is estimated in advance, the relationship between the grain increase amount: q and the storage amount in the temporary storage unit 530 is expressed as a function: f. Can be functionalized or tabulated. Therefore, the amount of grain increase in the grain tank 16 after the storage shutter 76 is closed is far beyond the value corresponding to the predetermined amount at which the storage completion signal is output by the storage amount detector 75. Regardless, if the storage completion signal is not output, it can be determined that the storage amount detector 75 is malfunctioning.

  Moreover, although the storage shutter 76 is changed from the storage closed position to the release open position, the storage amount detector 75 still outputs a storage completion signal even though the grain should have been discharged from the temporary storage unit 530. Even in the case of failure, the failure determination unit 94 can determine that the storage amount detector 75 has failed.

  Next, one specific embodiment of a combine according to the present invention will be described with reference to the drawings. FIG. 3 is a side view of a crawler traveling self-removing combine, and FIG. 4 is a plan view. The combine is provided with a traveling machine body 10 configured to be self-propelled by a pair of left and right crawler traveling devices 12 driven by the engine 11. The reaping part 14 for harvesting the planted cereals supported by the front part of the body frame 13 of the traveling body 10, the threshing device 15 for threshing the harvested cereals, and the grains threshed by the threshing unit 15 are stored. A grain tank 16, an unloader 17 that is a grain discharging device that discharges the grains in the grain tank 16 to the outside, and a driving control unit 19 including a driver seat 18 on which a driver is seated are provided. ing.

  As shown in FIGS. 3 and 4, the grain tank 16 is disposed on the right side of the machine body with respect to the threshing device 15 in the machine frame 13 and is located behind the engine 11. A grain raising device 24 is provided on the left side of the grain tank 16. The whipping device 24 is arranged on the left side of the machine body in the grain tank 16. As shown in FIG. 3, FIG. 4, and FIG. 5, the cerealing device 24 lifts the grain conveyed from the threshing device 15 to the inlet 27 by the lifting screw 26. The grains that have been lifted up to the inflow port 27 are splashed off from the inflow port 27 by a rotary blade 28 that is integrally provided with the lifting screw 26 and is driven to rotate counterclockwise. Fly and fall while being diffused. Most of the grains supplied from the inflow port 27 are supplied to the internal space M in the grain tank 16. A part of the grain supplied from the inflow port 27 is disposed in the front part of the grain tank 16 and supplied to the measurement unit 30 that measures the quality of the grain stored in the grain tank 16. In this way, the grain conveyed from the threshing device 15 is stored in the grain tank 16.

  As shown in FIGS. 3, 4, and 5, the bottom of the grain tank 16 has a discharge auger that is configured to discharge the grain stored in the grain tank 16 to the outside. 32 is provided. The discharge auger 32 is operated by the driving force of the engine 11. The grain stored in the grain tank 16 is discharged from the rear part of the grain tank 16 by the discharge auger 32 and discharged to the outside through the unloader 17 shown in FIGS.

  As shown in FIGS. 3 and 4, the front portion of the grain tank 16 is configured to measure the yield of the grain in the grain tank 16 based on the weight of the grain tank 16. A load cell is provided as the yield measuring device 35.

  As shown in FIG. 6, the grain tank 16 is provided with a level sensor group 37 that detects the accumulation level of the grains in the grain tank 16. The level sensor group 37 is composed of four level sensors arranged from below to above.

  As shown in FIG. 9, the measuring unit 30 is fitted and fixed to the mounting hole 45 </ b> A of the front wall 45 of the grain tank 16 via a vibration-proof rubber 47 for sealing. The measuring unit 30 includes a cylindrical formed body 53 and a quality measuring unit 5. As shown in FIGS. 5-8, the quality measurement part 5 is provided with the box-shaped measurement chamber housing 52 in which the quality sensor 50 which measures the quality of a grain was incorporated. The tubular formed body 53 includes a temporary storage unit 530 for temporarily storing the grains for which quality measurement is performed by the quality sensor 50.

  As shown in FIG. 9, a housing 55 that houses the quality sensor 50 is attached to the measurement chamber housing 52. The housing 55 houses a main body case 56 that houses the quality sensor 50 and a filter case 57 that is detachable from the main body case 56. The filter case 57 is configured to be detachably connected to the main body case 56 by a buckle-type connector 66. The coupling tool 66 is provided at each of the upper end portion and the lower end portion of the main body case 56, and is configured to be connected to and disconnected from the upper end portion and the lower end portion of the filter case 57.

  As shown in FIG. 7 and FIG. 8, the tubular forming body 53 includes a first wall 531 facing the inner space M of the grain tank 16, a pair of left and right side walls 533, and the quality measuring unit 5. It is a cylindrical body having a rectangular cross section composed of the second wall 532 facing toward it. In this embodiment, the second wall 532 is also used as a vertical plate portion facing the inner space M of the measurement chamber housing 52. Of course, the second walls 532 may be provided individually. Due to the structure of the cylindrical formed body 53, a vertically extending grain path 53P is created therein, and a temporary storage portion 530 is formed in the middle of the grain path 53P. The grain path 53P has an upper inlet 72 for taking in the grain and a lower outlet 73 for discharging the grain.

  As shown in FIGS. 7 and 8, the temporary storage unit 530 is configured to be able to temporarily store a part of the grains that have been transported from the threshing device 15 and jumped off by the rotary blades 28. Temporary storage unit 530 takes in a part of the grain conveyed from threshing device 15 from intake 72 formed in the upper part of temporary storage unit 530 and temporarily stores it. The grain stored in the temporary storage unit 530 can be discharged from the formed outlet 73 to the internal space M in the grain tank 16. In the upper part of the temporary storage unit 530, a storage amount detector 75 including a proximity sensor that detects the grain is provided on the side wall 533 of the tubular formed body 53. A storage shutter 76 that closes or opens the discharge port 73 is provided below the temporary storage unit 530. A quality sensor 50 that detects the quality of the grains stored in the temporary storage unit 530 faces the temporary storage unit 530.

  As shown in FIGS. 7 and 8, the discharge number securing area 534 is created as a part of the grain path 53 </ b> P and adjacent to the lower part of the storage shutter 76. For this reason, the number-of-discharges securing area 534 differs from the internal space M of the grain tank 16 in the degree of grain accumulation. The grain level detector 41 described in detail with reference to FIG. 1 is provided on the first wall 531 in the lower end region of the discharge count securing region 534. The volume of the number-of-discharges securing area 534 is preferably more than doubled so as to be larger than the temporary storage volume of the grains that can be stored above the storage shutter 76. The grain level detector 41 is arranged such that its detection surface 410 is flush with the inner surface of the tubular formed body 53, that is, the inner surface of the first wall 531. A second grain level detector 42 is provided on the second wall 532, and the detection surface 420 is also arranged so as to be flush with the inner surface of the tubular formed body 53, that is, the inner surface of the second wall 532. Has been.

  As shown in FIGS. 7 and 8, when the measurement unit 30 is fitted and fixed in the grain tank 16, the quality sensor 50 comes to be located in the grain tank 16. That is, the quality sensor 50 is provided in the grain tank 16. The quality sensor 50 measures the quality of the grain stored in the grain tank 16. The quality sensor 50 performs quality measurement on the grains temporarily stored in the temporary storage unit 530. The quality sensor 50 is an optical detection method, and is configured to be able to measure the internal quality such as the moisture value and protein value of a stationary grain without contact.

  The storage shutter 76 is configured as a plate-like swinging type. The storage shutter 76 is switched between a storage closed position in a horizontal posture and a discharge open position in a downward vertical posture by a switching mechanism 80 configured by a cam or the like by driving a motor 78. The storage shutter 76 swings around a lateral support shaft 81 that intersects the opening / closing direction of the storage shutter 76. The support shaft 81 is supported by the first wall 531 of the tubular formed body 53.

  FIG. 10 is a functional block diagram of the measurement control system constructed in this combine. This functional block diagram controls a detector group provided in the measurement unit 30, a measurement control unit 9 as a core element of the measurement control system, an input signal processing unit 9A as a data input interface, and various operation devices. A device control unit 9B is shown. The measurement control unit 9, the input signal processing unit 9A, and the device control unit 9B are interconnected by an in-vehicle LAN or other data transmission line. The measurement control unit 9 uses the basic principle of measurement control described with reference to FIG. 1 and the basic principle of failure determination described with reference to FIG.

  The input signal processing unit 9A includes a measurement value signal from the yield measuring unit 35, quality value data from the quality measuring unit 5, a storage completion signal from the storage amount detector 75, a shutter position signal from the shutter position detector 79, An over-level signal or the like from the first grain level detector 41 or the second grain level detector 42 is input. Further, a signal from a switch related to measurement control such as a measurement start switch (not shown) is also input. The signal input to the input signal processing unit 9A undergoes necessary preprocessing and is transferred to the measurement control unit 9.

  The device control unit 9B gives an open command and a close command to various operating devices controlled by the measurement control unit 9, for example, the storage shutter 76, and a measurement start command and a measurement end command to the quality measurement unit 5.

  In the measurement control unit 9, a monitoring module 90, a yield calculation unit 91, a shutter control unit 92, a quality measurement management unit 93, and a failure determination unit 94 are substantially constructed by software. The monitoring module 90 has a function unit that receives signals from various detectors via the input signal processing unit 9A and monitors various states in the measurement control described with reference to FIGS. For example, the storage monitoring unit 901 monitors the storage state of the grains in the temporary storage unit 530 based on a signal from the storage amount detector 75. Based on the signal from the shutter position detector 79, the shutter position monitoring unit 902 monitors whether the storage shutter 76 is in the storage closed position or the discharge open position. The grain level monitoring unit 903 monitors the upper surface level of the grain entering from the discharge port 73 of the tubular formed body 53 based on the signals from the grain level detectors 41 and 42.

  The yield calculation unit 91 calculates the yield from the measurement value signal of the yield measuring device 35, which is a load cell, using a measurement value / yield conversion table. In this embodiment, the yield calculation unit 91 has a function of calculating an increase in yield from a specified start time to a specified end time based on the yield calculated at a predetermined sampling time.

  The quality measurement management unit 93 commands the quality measurement unit 5 to start measurement and end measurement in cooperation with the shutter control unit 92 and the monitoring module 90. In addition to this, there is also a function of linking and recording the grain moisture and protein component amounts obtained from the quality value data from the quality measuring unit 5 and a specific point in the field obtained from this combine traveling locus data. Have.

  The failure determination unit 94 has a function of performing the failure determination of the storage amount detector 75 described with reference to FIG. 2 in cooperation with the monitoring module 90, the yield calculation unit 91, and the like. Since the function description is as described above, the description is omitted here.

[Another embodiment]
(1) In the above-described embodiment, proximity sensors are used as the storage amount detector 75 and the grain level detectors 41 and 42. However, the present invention is not limited to this, and it is possible to detect a grain such as a contact sensor. If available. In the above-described embodiment, the two grain level detectors 41 and 42 are provided at the same height, but may be provided at different heights.
(2) In the above-described embodiment, the cylindrical formed body 53 is about twice the amount of grain that can be stored in the temporary storage unit 530 from the lower end of the storage shutter 76 at the release open position to the discharge port 73. Although the volume is secured, instead of this, the length may be shortened only to the length at which the grain level detector 41 is provided at the lower end of the storage shutter 76 at the release open position.
(3) In the above-described embodiment, the cylindrical formed body 53 and the quality measuring unit 5 are integrated with each other. However, separate structures independent of each other may be used.
(4) The division of the functional units shown in FIG. 10 is an example, and the integration of the functional units and the division of the functional units are arbitrary. Any configuration is possible as long as the control function of the present invention is realized, and these functions can be realized by hardware and / or software.

  The present invention can be used not only for a self-removing combine but also for a full throwing type combine. In addition to the crawler travel combine, it can also be used for a wheel travel combine.

14: Cutting part 15: Threshing device 16: Grain tank 30: Measuring unit 35: Yield measuring device 37: Level sensor group 41: Grain level detector (first grain level detector)
42: 2nd grain level detector 5: Quality measurement part 50: Quality sensor 52: Measurement chamber housing 53: Cylindrical formation body 53P: Grain path | route 530: Temporary storage part 531: 1st wall 532: 2nd wall 533: Side wall 534: Discharge count securing area 72: Intake port 73: Discharge port 75: Storage amount detector 76: Storage shutter 79: Shutter position detector 9: Measurement control unit 90: Monitoring module 91: Yield calculation unit 92: Shutter control unit 93: Quality measurement management unit 94: Failure determination unit 901: Storage monitoring unit 902: Shutter position monitoring unit 903: Grain level monitoring unit

Claims (5)

A grain tank for storing the grains conveyed from the threshing device;
A grain discharging device for discharging the grains stored in the grain tank from the bottom of the grain tank to the outside;
An upper intake port that is provided in the grain tank and takes in a part of the grain that has been conveyed from the threshing device, and a lower part that discharges the grain taken in from the intake port to the grain tank. A grain pathway having an outlet;
A temporary reservoir located in the middle of the grain path;
A closed position for storage in which the grain taken in from the intake port is stored in the temporary storage part, and an open position for release in which the stored grain is released from the temporary storage part. A storage shutter whose position can be changed to
A storage amount detector that detects that the grain stored in the temporary storage unit has reached a predetermined amount and outputs a storage completion signal; and
A quality measuring unit for detecting the quality of the grains stored in the temporary storage unit;
A shutter control unit for controlling a position changing operation of the storage shutter;
A yield measuring device for measuring the yield of the grain stored in the grain tank;
Failure of the storage amount detector when the storage amount detector does not output the storage completion signal even if the storage amount in the temporary storage unit estimated based on the measurement result of the yield measuring device exceeds the predetermined amount And a failure determination unit for determining.   A shutter position detector for detecting a change position of the storage shutter is provided, and the failure determination unit is configured to store the storage amount based on a measurement result of the yield measuring device with time and a detection result of the shutter position detector. The combine according to claim 1, wherein a detector failure is determined.   The failure determination is based on the fact that the shutter position detector does not detect the change in the position of the storage shutter even though the control signal for commanding the position change operation of the storage shutter is output from the shutter control unit. The combine according to claim 2, wherein the unit determines a failure of the storage shutter.   The failure determination unit determines a failure of the storage amount detector based on an increase from the yield reaching a predetermined amount when the storage shutter is changed to the storage closed position. 3. Combine according to 3.   Even after the storage shutter is changed from the storage closed position to the release open position, the storage amount detector continues to output the storage completion signal. The combine according to any one of claims 1 to 4, wherein a failure is determined.

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