JP2567999B2 - Threshing selection control device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for detecting the thickness of a processed material layer on an oscillating sorting plate provided in a sorting device and detecting the amount of cereal culm supplied to a handling room. The present invention relates to a threshing / sorting control device provided with control means for adjusting the processing capacity of the sorting device based on the detected value of the grain culm supply amount detection means.

[0002]

2. Description of the Related Art In threshing and sorting devices such as combine harvesters,
2. Description of the Related Art Conventionally, the processing capacity of a sorting device has been adjusted in proportion to the grain culm supply amount detected by a grain culm supply amount detection unit such as a vehicle speed sensor or a culm thickness sensor. Furthermore, recently, processing amount detection means for directly detecting the thickness of the layer of the processing object on the swing sorting plate is provided, and by using the detected values together, the processing capacity of the sorting apparatus is adjusted more appropriately. An improved threshing / sorting control device has been proposed (see, for example, Japanese Patent Application No. 2-402532).

In this case, generally, the control based on the detection value of the grain culm supply amount detecting means is mainly performed, and the control based on the detection value of the processed material amount detecting means is generally performed. This is because the former is open loop control, and the control accuracy is inferior to the latter closed loop control, but there is no risk of control becoming unstable due to dead time (control delay time). In addition, as a practical problem, it is difficult to accurately detect the layer thickness of the processed material on the swing selection plate, while the thickness of the processed material layer is the amount of grain culm supplied if other conditions are constant. This is because it increases or decreases in proportion to.

From this point of view, first, the target value of the processing capacity of the sorting device is set based on the detection value of the grain culm supply amount detecting means, and then the target value is subjected to the correction calculation according to the detection value of the processed material amount detecting means. It is desirable to control such that the processing capacity of the sorting device is adjusted based on the corrected target value.

[0005]

However, at the end of mowing, for example, when mowing is stopped and the machine is turned in the headland of the field, the supply of cereals is lost, so that the above-mentioned cereals are used. The control mainly based on the detection value of the supply amount detection means becomes inadequate. Rather, at the end of mowing, it is desirable to adjust the processing capacity of the sorting device mainly based on the detection value of the processed material amount detecting means. The present invention has been made in view of the above circumstances, and an object thereof is to appropriately adjust the processing capacity of a sorting device even at the end of mowing.

[0006]

The threshing / sorting device of the present invention is provided with a detection value of a treated substance amount detecting means for detecting the thickness of a layer of the treated substance on an oscillating sorting plate provided in the sorting device and to a handling room. Based on the detection value of the grain culm supply amount detecting means for detecting the grain culm supply amount of, the control means for adjusting the processing capacity of the sorting device is provided, and the first characteristic configuration is Grain culm supply stop detection means for detecting supply stop of grain culm to the handling room is provided, and the control means detects the processed material amount when the supply stop is detected by the grain culm supply stop detection means. It is configured to adjust the throughput of the sorting device based only on the detection value of the means.

The second characteristic configuration specifies a preferable specific configuration when the first characteristic configuration is carried out, and the control means is arranged so that the smaller the detection value of the processed material amount detection means is, The processing capacity of the sorting device is adjusted to be small, and when the detected value is equal to or lower than the lower limit value for a predetermined time, the processing capacity of the sorting device is further reduced. It is in.

[0008]

According to the first characteristic configuration, the control means normally adjusts the processing capacity of the sorting device based on the detection value of the processed material amount detection means and the detection value of the grain culm supply amount detection means. However, when the supply of grain culm to the handling room is detected by the grain culm supply stop detecting means, it is determined that the cutting has been completed, and the processing of the sorting device is performed based only on the detected value of the processed material amount detecting means. Adjust ability.

According to the second characteristic configuration, at the end of mowing, as the detection value of the processed material amount detecting means becomes smaller, that is, as the layer of the processed material on the rocking sorting plate becomes thinner, The processing capacity is adjusted to be small. Then, when the state of being lower than the lower limit value continues for a predetermined time, the processing capacity of the sorting apparatus is further reduced. By finely adjusting the processing capacity of the sorting device in this manner, the sorting accuracy at the end of mowing is increased.

[0010]

As described above, according to the threshing selection control device of the present invention, the processing capacity of the selection device at the end of cutting can be adjusted appropriately. As a result, the accuracy of sorting at the end of mowing is improved, which contributes to the reduction of loss.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a so-called self-removing combine will be described below with reference to the drawings.

As shown in FIG. 2, the self-removing type combine comprises a pair of left and right crawler traveling devices 1, a threshing unit 2, and
The vehicle V includes a boarding operation unit 3 and a pre-cutting unit 4 that is mounted at a front portion of the vehicle V so as to be able to drive up and down. The pre-cutting processing unit 4 includes a weeding tool 5 attached to the tip, a raising device 6 for raising the cereal culm in the field, a cutting blade 7 for cutting the root of the cultivated culm, and cutting and threshing the cereal culm. A transport device 9 for transporting to the feed chain 16 of the section 2 is provided.

FIG. 3 shows the power transmission system. The output of the engine E mounted on the fuselage V is transmitted to the threshing unit 2 via a belt-tensioning threshing clutch 10 and a belt-tensioning traveling clutch 11 and a traveling hydraulic continuously variable transmission 12 are transmitted. The transmission is transmitted to the mission unit 13 of the crawler traveling device 1 via the transmission unit. Part of the output transmitted to the transmission unit 13 is transmitted to the pre-cutting processing unit 4 via a belt tension type cutting clutch 14. The threshing switch SW1 for detecting the on / off state of the threshing clutch 10
Is provided.

As shown in FIG. 4, the threshing section 2 includes a handling cylinder 15
, A feed chain 16 for conveying grain culms supplied from the pre-cutting unit 4, a cross-flow fan 17 for discharging dust, a sorting device B including a tow 18 and a swing sorting plate 19, A first port 20 for collecting grains and a second port 21 for collecting a mixture of grains and straw chips are provided.

In the lower part of the handling room A, a receiving net 22 for leaking threshing products is provided along the lower outer periphery of the handling drum 15. The processed material which could not be leaked from the receiving net 22 falls from the rear end of the receiving net 22 to the swing selection plate 19. At the rear end of the frame of the receiving net 22, a layer thickness sensor S1 as a processed material amount detecting means for detecting the thickness of the processed material layer on the swing sorting plate 19 is provided.
Is provided.

The oscillating sorting plate 19 of the sorting device B includes
8 includes a Glen pan 23 located above, a chaff sheave 24 located behind it, a Glen sheave 25 located below it, and the like. Grains leaking from the grain sieve 25 are collected from the first port 20 provided below the swing selection plate 19 and stored in a tank or the like. Further, the mixture of the grains and the straw scraps falling from the rear end of the chaff sheave 24 or the rear end of the Glensieeve 25 is collected from the No. 2 port 21 and the swing sorting plate 19
Is reduced to

The chaff sheave 24 is, as shown in FIG.
A plurality of strip-shaped members 24a juxtaposed in the processing object transfer direction
Are rotatably attached to the left and right side plates with the central portion as a fulcrum. By moving the operation rod 25 pivotally attached to the lower end of each band-shaped member 24a in the front-rear direction, each band-shaped member 24a is moved.
Is changed at the same time. As a result, the band-shaped member 24
The interval t between adjacent ones of a (hereinafter referred to as “chaff sheave opening”) can be changed and adjusted.

A sheave motor M1 for electrically changing and adjusting the opening of the chaff sheave is provided, and is connected to the operation rod 25 via a gear-type linkage mechanism 26, a swing arm 27, and a release wire 28. In the figure, reference numeral 29 denotes a spring for urging the chaff sheave to return to the closing side, and S2 denotes a potentiometer type chaff sheave opening sensor for detecting the rotation angle of the swing arm 27 as the chaff sheave opening. The sheave motor M1 is switched between normal rotation and reverse rotation by changing the polarity of the applied voltage.

The tors 18 of the sorting apparatus B are the swing sorting plate 1
This is for blowing off the straw waste on the upper surface of the fan 9, and the wind force thereof is performed by changing the opening of the fan case cover 18a (hereinafter referred to as the opening of the toumi exhaust air), as shown in FIG. In other words, the larger the degree of opening of the turtle exhaust air, the greater the amount of air escaping from the opening, and the smaller the amount of wind (hereinafter referred to as storm wind) exerted on the processed material on the swing sorting plate 19.

As shown in FIG. 6, the adjustment of the turtle exhaust air opening is performed by a turtle motor M2. As in the case of the sheave motor M1, by changing the polarity of the applied voltage to rotate the torsion motor M2 forward or backward, the fan case cover 18a opens and closes via the linkage mechanism 30, the swing arm 31, and the rods 32, 33. In the figure, S3 is a swing arm 31.
Is a potentiometer-type exhaust air opening sensor for detecting the rotation angle of the air outlet as an air exhaust opening.

The processing capability of the sorting apparatus B is changed and adjusted by changing and adjusting the opening degree of the chaff sheave and the opening degree of the turtle exhaust air as described above. As shown in FIG. 1, these adjustments are controlled by a control means H equipped with a microcomputer. Basically, the greater the amount of grain culm supplied to the handling room A and the thicker the layer of the processed material on the rocking sorting plate 19, the greater the processing capacity of the sorting device B, that is, the chaff sheave opening degree. Is controlled to be large and the exhaust opening degree of Toumi is reduced.

The amount of grain culm supplied to the handling room A is detected as follows. As shown in FIG. 7, a mechanism is provided above the feed chain 16 to press the grain culm to be conveyed downward and to clamp the culm with the feed chain 16. That is, the plurality of pressing members 34a,
Each of the springs 34b is elastically biased by a coil spring 34c. Further, a potentiometer S4 is provided which detects the upward displacement of the pivot shaft P between the first pressing member 34a and the second pressing member 34b from the front as a resistance value change.

The potentiometer (hereinafter referred to as a culm thickness sensor) S4 detects the thickness of the cereal culm sandwiched between the feed chain 16 and the pressing members 34a and 34b. Since the feed speed of the feed chain 16 is kept substantially constant, the detection value of the culm thickness sensor S4 is
Is proportional to the amount of cereal stalk supplied. That is, this culm sensor S
Numeral 4 functions as a grain stalk supply amount detecting means for detecting the grain stalk supply amount to the handling room A.

The detection value of the culm thickness sensor S4, that is, the resistance value of the potentiometer is input to the control means H as a DC voltage of 0 to 5 volts. Then, after being converted into an 8-bit digital value (0-255), it is divided into 10-level values 0-9 (hereinafter referred to as straw levels).

The thickness of the processed material on the swing selection plate 19, more specifically, the layer thickness of the processed material deposited on the chaff sheave 24 is detected by the layer thickness sensor S1. Layer thickness sensor S1
8, as shown in FIG. 8, a sensor bar T that swings freely around a horizontal axis and a potentiometer PM that converts the rotation angle of the sensor bar T in the rearward direction (transfer direction of the processed object) into a resistance value. Become.

The sensor bar T is formed in a bifurcated shape in which the downstream portion T1 in the processed material transfer direction is longer than the upstream portion T2. As the thickness of the processed material increases, the backward rotation angle of the sensor bar T increases. However, when the thickness of the processed material is relatively small, the downstream portion T1 abuts on the processed material and the downstream portion T1 contacts the processed material. The configuration is such that when the thickness of the layer increases, the upstream portion T2 comes into contact with the processing object.

The detection value of the layer thickness sensor S1 (hereinafter referred to as a sheave voltage) is input to the control means H as a DC voltage of 0 to 5 V and is converted into an 8-bit digital value (0 to 255) A / A.
After being D-converted, it is divided into six values (hereinafter referred to as sheave levels) of 0 to 5 as described later.

The sheave level obtained as described above serves as information for adjusting and controlling the processing capacity of the sorting apparatus B, and is also displayed on the monitor 35 provided in the boarding control section 3, and Also used for alarms. That is, as shown in FIG. 1, the level is displayed by the bar graph display 35a, and the numerical value is displayed by the 7-segment display 35b.

The monitor 35 also includes a character display 35c and a buzzer 35d. Then, when the sheave level becomes 5, the control means H displays "Sheet Chuui!" On the character display 35c. If this state continues for 10 seconds or more, “Seeb Keiho!” Is displayed and the buzzer 35d
Issues an alarm at. The operator takes necessary measures such as lowering the traveling speed based on these warnings, and avoids the occurrence of a clogging state due to the processing object layer becoming too thick.

Further, the boarding control section 3 is provided with a selection mode changeover switch SW2, and this changeover signal is inputted to the control means H as shown in FIG. The selection mode changeover switch SW2 selects one of the seven selection modes. The seven sorting modes are:
There are three main modes: manual mode, rice mode, and wheat mode.

When the manual mode is selected, the chaff sheave opening and the toumi exhaust air opening can be manually set using a setting device (not shown). The rice mode has four modes, rice 2 is a standard mode, rice 1 is a mode having a minimum sorting capacity, rice 3 is a high moisture mode, and rice 4 is a wet mode. There are two modes of wheat mode: wheat 1 is a standard mode and wheat 2 is a high moisture mode.

When these six automatic modes (rice mode and wheat mode) are selected, the control means H makes the above-mentioned straw level (amount of grain culm supplied to the handling room A) and sheave level (swing selection) for each mode. The chaff sheave opening degree and the toumi exhaust air opening degree are automatically adjusted based on the layer thickness of the processed material on the plate 19. Hereinafter, this automatic adjustment control will be described with reference to a flowchart.

The processing routine of the threshing selection control shown in FIG. 9 is based on the straw level and the sheave level and is based on the straw level and the sheave level. This is a subroutine that determines the value). When this subroutine is called from the main routine (not shown), the sheave level determination process is first performed. A subroutine of this sheave level determination processing is shown in FIGS.

In the process shown in FIG. 10, as described above, six sheave levels 0 to 5 are obtained from the detection value (sheave voltage) of the layer thickness sensor S3. Actually, the sheave voltage is set to 0 once.
After converting to an 8-bit digital value of ~ 255, the sheave level is determined based on the digital value.
In the figure, each threshold value is indicated by a sheave voltage for easy understanding.

In the process of FIG. 11, the sheave level is validated only when the sheave level is different from the previous value (OLD) for about 1 second continuously. Therefore, the counter has about 1
The initial value corresponding to the second is substituted.

In the process of FIG. 12, the flags LVL3, LVL4 and LVL5 for storing the peak when the change of the sheave level turns from rising to falling are set and reset. The flags LVL5, LVL4, LVL3 are set (reset at others) corresponding to the peaks 5, 4, 3 of the sheave level, respectively, and are all reset when the sheave level becomes 2 or less. These flags LVL3, LVL
VL4 and LVL5 are used in a correction process described later.

Returning to FIG. 9, when the sheave level determination process is completed, the automatic mode starting condition is checked. That is, if the threshing switch SW1 is ON (the threshing clutch 10 is engaged) and the automatic mode (a mode other than the manual mode) is selected by the selection mode changeover switch SW2, the process proceeds to the next process. If is not satisfied, do nothing and return to the main routine. That is, in this case, the obtained sheave level is used only for the above-mentioned monitor display and alarm.

When the automatic mode activation condition is satisfied, it is checked whether or not the straw level is zero (process (a) in FIG. 9). The straw level being zero means that the culm thickness sensor S4 has detected the stop of the supply of the grain culms to the handling room A. That is, the culm thickness sensor S4 functions not only as a grain culm supply amount detecting means but also as a grain culm supply stop detecting means. When the straw level is zero, the cutting end mode processing (see FIG. 19) described later is executed, and the layer thickness sensor S
The processing capacity of the sorting apparatus B is adjusted based on only the detected value (sheave level) of 1.

When the straw level is not zero, the chaff target value CH and the toumi target value TO are set in accordance with the tables of FIGS. 13 and 14 based on the straw level. FIG. 15 shows the relationship between the chaff sheave opening (unit: mm), which is the actual control amount, and the chaff target value CH. Similarly, the relationship between the turtle exhaust air opening (unit: mm) and the turtle target value TO is as shown in FIG. The tables in FIGS. 13 to 16 are examples, and the contents of the tables are different for different models. In addition, these tables are determined based on experiments and the like in consideration of the amount of the processed material collected from the second opening 21 and returned to the swing sorting plate 19.

Next, the chaff target value CH and the toumi target value TO set based on the straw level are corrected based on the sheave level. However, first, it is checked whether or not the sheave level is zero, and if it is zero, no correction is performed (process (b) in FIG. 9). In other words, the final chaff sheave opening and the turtle exhaust air opening are determined by the chaff target value CH and the turtle target value TO set based on the straw level.

If the sheave level is not zero, it is next determined whether or not it is the rice 4 mode (wetting mode) (second half of FIG. 9). If the rice 4 mode is selected, the rice 4 mode correction process shown in FIG. 17 is executed. That is, if the sheave level is 2 or more, both the chuff target value CH and the toumi target value TO are set to 7. This means maximizing the chaff sheave opening and the Toumi wind force (maximizing the processing capacity of the sorting apparatus B) in order to avoid the clogging of the processed material. When the sheave level is 1, no correction is made.

If a mode other than the rice 4 mode is selected, the normal mode correction process shown in FIG. 18 is executed. At this time, the cases are classified using the flags LVL3, LVL4, and LVL5 set and reset in the processing of FIG. In the figure, the corrected values of the chaff target value CH when the sheave levels are 4 and 3 are substituted into CH4 and CH3, respectively (processes (a) and (b)).

When LVL5 is 1, as shown in FIG. 18, if both chaff target values CH and CH4 are less than 5, then 5 is substituted for chaff target value CH, and otherwise 7 (maximum value) is substituted. It Further, 7 (maximum value) is unconditionally substituted for the toy target value TO. When LVL4 is 1, if the chaff target value CH is less than 4, 4 is substituted, and if it is 4 or more, 1 is added. If CH3 or less, CH
A value obtained by adding 1 to 3 is substituted. 7 (maximum value) is unconditionally substituted for the toy target value TO.

When LVL3 is 1, the chaff target value CH
Is added to. The TOUMI target value TO is not corrected.
When none of the flags LVL5, LVL4, LVL3 is set, the routine returns to the routine of FIG. 9 without performing the correction process of the chaff target value CH and the toumi target value TO.

As described above, the flags LVL5 and LVL
4, LVL3 is for storing a peak when the change of the sheave level changes from rising to falling,
It will not be reset until the sheave level drops below 2. Therefore, the correction calculation in the direction of increasing the processing capability of the sorting device B, which is classified according to the flags LVL3, LVL4, and LVL5, is maintained until the sheave level becomes 2 or less. This is done in order to quickly return to the safe area where the sheave level is 1 or 2 in order to avoid a clogged state of the processed material.

As described above, the cutting end mode processing executed when the straw level is zero is as shown in FIG. First, the sheave level is assigned to the chaff target value CH. Therefore, as shown in FIG. 15, as the sheave level decreases from 5 to 0, that is, the layer thickness sensor S
The chaff sheave opening becomes smaller as the detected value of 1 becomes smaller. That is, the processing capacity of the sorting apparatus B is reduced. The standard value 4 is substituted for the target TO value TO regardless of the sheave level.

Next, the chaff target value CH is changed from 1 to 0 when the state where the sheave level is 1 or less continues for 3 seconds. That is, the processing capacity of the sorting apparatus B is further reduced. By finely adjusting the processing capacity of the sorting device in this manner, the sorting accuracy at the end of cutting can be improved.

The chaff target value C after correction as described above
When H and the target value TO are determined, the processing of the threshing / sorting control of FIG. 9 ends, and the process returns to the main routine (not shown). In the main routine, the opening degree of the chaff sheave and the opening degree of the turtle exhaust air are adjusted based on the corrected chaff target value CH and the turtle target value TO.

That is, the control means H controls the chaff target value CH.
, The chaff sheave opening sensor S as shown in FIG.
2 as the feedback amount using the detected value of
Drive control. Similarly, based on the toy target value TO, the tow motor M2 is drive-controlled using the detection value of the toe exhaust air opening sensor S3 as a feedback amount.

Other examples will be listed below. In the above embodiment, the culm thickness sensor S4 is used as the grain culm supply stop detecting means,
Although the grain culm supply is stopped when the detected value is equal to or less than the predetermined value (the straw level is zero), for example, a switch for detecting the stop of the feed chain may be provided as the grain culm supply stop detection means.

Sheave level (detection value of layer thickness sensor S1)
In determining the processing capacity of the sorting apparatus B only by the above, in the embodiment, the toumi target value TO is fixed to the standard value 4 and only the chaff target value CH is changed according to the sheave level.
If the target value TO is also changed according to the sheave level, finer adjustment can be made.

In the above embodiment, the culm thickness sensor for detecting the thickness of the grain culm conveyed by the feed chain is used as the grain culm supply amount detecting means, but a sensor for detecting the vehicle speed (running speed) is used instead. Good. Generally in the same field,
This is because a cutting amount proportional to the vehicle speed, that is, a grain culm supply amount can be obtained. Further, the processing object amount detecting means is not limited to the layer thickness sensor of the embodiment, but may be a means for detecting the weight of the processing object on the swing sorting plate.

The sorting apparatus B of the present embodiment adjusts its processing capacity by adjusting the chaff sheave opening and the amount of Karafu air. The concrete structure for adjusting the chaf sheave opening and the amount of Karafu air is various. Can be changed. In addition, the present invention can be applied to a sorting apparatus that performs various types of processing capacity adjustment as described below. A method that changes the swing cycle (swing speed) of the swing sorting plate. A method to change the tilt angle of the swing selection plate. A method to move back and forth a shield plate for adjusting the filtration area such as chaff sheave and Glen sheave. A method that changes the distance between adjacent rack plates of the sorting rack.

Further, the present invention is not limited to the so-called self-removing combine as in the embodiment, but can be applied to an all-rod charging combine. It should be noted that reference numerals are added to the claims for convenience of comparison with the drawings, but the present invention is not limited to the configurations of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a block diagram of a combine threshing and sorting apparatus according to an embodiment of the present invention.

[Fig. 2] Similarly, a side view of the combine

FIG. 3 is an explanatory view of a power transmission system of the combine, likewise.

FIG. 4 is a perspective view showing a threshing section of the combine as well.

FIG. 5 is a schematic view of a chaff sheave opening adjustment mechanism of the sorting device.

FIG. 6 is a schematic view of a toumi exhaust air opening adjustment mechanism of the sorting device.

FIG. 7 is a side view of the grain culm supply amount detecting means and its surroundings.

FIG. 8 is a side view of the processing amount detection means and its periphery;

FIG. 9: Flow chart of threshing selection control

FIG. 10 is a flowchart of a sheave level determination process;

FIG. 11 is a flowchart of a sheave level determination process.

FIG. 12 is a flowchart of a sheave level determination process;

FIG. 13 is a table showing a relationship between a straw level and a chaff target value;

FIG. 14 is a table showing the relationship between straw levels and target values for tomi.

FIG. 15 is a table showing a relationship between a chaff target value and a chaff sheave opening;

FIG. 16 is a table showing a relationship between a target pit value and a pit exhaust air opening degree;

FIG. 17 is a flowchart of rice 4 mode correction processing.

FIG. 18 is a flowchart of normal mode correction processing.

FIG. 19 is a flowchart of the end-of-cut mode processing.

[Explanation of symbols]

 19 rocking sorting plate A handling room B sorting device H control means S1 processed material amount detecting means S4 grain culm supply amount detecting means

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Suezo 64 Ishizukita-cho, Sakai City, Osaka Prefecture Inside Kubota Sakai Works Co., Ltd. In-house (72) Inventor Takao Mizoguchi 64 Ishizukita-cho, Sakai-shi, Osaka Kubota Sakai Works Co., Ltd. (56) References JP-A-2-109913 (JP, A) JP-A-61-192221 (JP, A)

Claims (2)

(57) [Claims] 1. A detection value of a processed material amount detecting means (S1) for detecting a layer thickness of a processed material on an oscillating sorting plate (19) provided in a sorting device (B) and a handling chamber (A). Based on the detection value of the grain culm supply amount detecting means (S4) for detecting the grain culm supply amount of the above, the threshing sorting control device provided with the control means (H) for adjusting the processing capacity of the sorting device (B). A grain culm supply stop detection means (S4) for detecting a stop of the supply of grain culm to the handling room (A) is provided, and the control means (H) is the grain culm supply stop detection means (S4). ) Has detected the supply stop, the processed material amount detecting means (S
A threshing selection control device configured to adjust the processing capacity of the selection device (B) based only on the detection value of 1). 2. The control means (H) adjusts the processing capacity of the sorting device (B) to be smaller as the detection value of the processed material amount detection means (S1) is smaller, and the detection thereof is performed. The threshing selection control device according to claim 1, wherein the threshing selection control device is configured to further reduce the processing capacity of the selection device (B) when the value is equal to or less than the lower limit value for a predetermined time.