JP4623672B2 - Combine - Google Patents

Description

  The present invention relates to a combine provided with a second flow rate control means for automatically controlling the fin opening of a chaff sheave based on a detection value of a second flow rate sensor.

2. Description of the Related Art In recent years, there is known a combine that can change the fin opening of a chaff sheave provided in a threshing selection unit and automatically controls the fin opening of the chaff sheave according to the processing status of the threshing selection unit. For example, in the combine disclosed in Patent Documents 1 to 3, the second flow rate of the second reduced product is detected by the second flow rate sensor and the fin opening of the chaff sheave is automatically controlled based on the detection value of the second flow rate sensor. Flow control is performed. According to such second flow rate control, it is possible to optimize the second flow rate regardless of material conditions and the like, and thus it is possible to perform threshing sorting processing with high efficiency and high accuracy.
No. 1-20844 Japanese Utility Model Publication 3-42 Japanese Patent No. 2855523

  By the way, immediately after the start of the mowing operation, the mowing stem pod has not reached the threshing selection unit, so when the second flow rate control is started immediately after the mowing operation is started, the fin opening of the chaff sheave is closed more than necessary. Or an unstable control state may occur. Therefore, in the conventional combine that performs the second flow rate control, the start of the cutting operation is determined by using the shoot detection switch (pretreatment depth main switch) provided in the shoot conveyance path of the pretreatment unit, and The timing at which the stems reach the threshing selection unit is calculated based on the vehicle speed, and the second flow rate control is started at the calculated timing, and the fin opening of the chaff sheave at the start of the second flow rate control is determined. It is set based on the vehicle speed (see, for example, Patent Documents 2 and 3).

  However, the timing at which the grain threshed from the stem stalk at the beginning of cutting reaches the chaff sheave is shifted because of the nature of the cutting material (the amount of waste, the difference in water content, etc.), so the grain has not reached. There was a possibility that the second flow control would start in this state. And if the second flow rate control starts when there is no grain, the fin opening of the chaff sheave is controlled to be closed more than necessary, so the second reduced product reaches the second flow rate sensor position and is normal In the meantime, there was a possibility that the chaff sheave overflowed and the third scattering occurred.

The present invention was created to solve these problems in view of the above circumstances, and has a chaff sheave capable of changing the fin opening and a second flow rate for detecting the flow rate of the second reduced product. A combine that includes a sensor and a second flow rate control means that automatically controls the fin opening of the chaff sheave based on the detection value of the second flow rate sensor, and determines whether or not the combine is in a cutting operation state Mowing operation judging means, No. 2 flow rate control start regulating means for restricting the start of No. 2 flow rate control, and No. 2 flow rate control until the detected value of the No. 2 flow rate sensor becomes a predetermined value or more after starting the mowing work A fin opening maintaining means for maintaining the fin opening of the chaff sheave at a predetermined opening according to the vehicle speed while the start restricting means restricts the start of the second flow rate control.
In this way, since the second flow rate control is started after the second reduced product reaches the position of the second flow rate sensor, the second flow rate control can be started in a stable state regardless of the material conditions and the like. Moreover, since the opening of the chaff sheave is maintained at a predetermined opening according to the vehicle speed until the second flow rate control is started after the cutting operation is started, the chaff sheave overflows immediately after the cutting operation is started. It is possible to avoid and prevent the third scattering, and it is possible to surely perform the second reduction and smoothly shift to the second flow rate control.

[First embodiment]
Next, embodiments of the present invention will be described with reference to the drawings. In FIG. 1, 1 is a combine, and the combine 1 includes a pre-processing unit 2 that cuts stalks, a threshing selection unit 3 that threshs and sorts the grains from the cutting stalks, and a threshed waste. Is provided with a post-processing section 4 for post-processing, a grain tank 5 for storing the selected grains, an operation section 6 on which an operator gets on, and a crawler-type traveling section 7.

  The pre-processing unit 2 cuts the stems of the stems while carrying out the weeding and raising of the uncut stems and conveys the trimmed stems to the threshing selection unit 3. In the process of transporting to the threshing sorting unit 3, the holding position adjustment of the stem culm according to the culm length is performed, and the handling depth in the threshing sorting unit 3 is appropriately maintained. The whole of the preprocessing unit 2 is connected to the front end of the traveling machine body so as to be movable up and down. The preprocessing unit 2 is lifted during non-cutting travel, and is lowered during cutting cutting.

  As shown in FIG. 2, the threshing selection unit 3 includes a threshing feed chain 9 that conveys the stems along the handling chamber 8, and a waste transporting device 10 that conveys the threshed stems to the post-processing unit 4. A handling cylinder 11 that is rotatably mounted in the handling chamber 8 and threshs the processed product (grain containing the mixture) from the conveying stems, a first receiving net 12 that leaks the threshed processed product, and A processing cylinder 13 for single-processing the processed material that has reached the end of the handling chamber 8 without leaking from the single receiving network 12, and a second receiving network 14 for leaking the single-sized processed material here A swing sorting body 15 that swings and sorts the processed material leaked from the first receiving net 12 and the second receiving net 14, and a compressed air fan 16 that generates a sorting wind in front of the swing sorting body 15. The first spiral 17 for collecting the first thing, the second spiral 18 for collecting the second thing, and the second choice for generating a second sorting wind in front of the second spiral 18 A fan 19, a Haichirishitsu 20 provided at the end portion above the swing sorting member 15 is configured by a dust-exhaust fan 21 which is rotatably furnished to exhaust dust chamber 20. And the first thing collected by the first helix 17 is stored in the grain tank 5 via the milled cylinder 22, and the second thing collected by the second helix 18 is passed through the second reducing cylinder 23. Thus, it is reduced onto the rocking sorter 15.

  The oscillating sorter 15 includes an oscillating flow plate 24 that sequentially conveys the processed material leaked from the first receiving network 12 to the rear, and a chaff sheave 25 that sifts and sorts the processed material conveyed from the oscillating flow plate 24. , A swing assembly including a grain sheave 26 for further sifting and sorting the processed material leaked from the chaff sheave 25, and a strok rack 27 disposed at the rear of the chaff sheave 25. ) Is continuously reciprocated in a predetermined cycle.

  The chaff sheave 25 includes a plurality of fins 25a arranged in parallel at a predetermined interval in the front-rear direction. Each fin 25a is inclined in a front-rear and a rear-high state, and the grains are leaked from the gaps between the fins 25a while the processed material is transferred backward along with the swing of the swing sorter 15. The gap (fin opening) between the fins 25a in the chaff sheave 25 can be changed, and the flow rate of the second reduced product is optimized based on the change in the fin opening. Specifically, a second flow rate sensor S that detects the flow rate of the second reduced product is provided at the second reduction port K of the second reduction cylinder 23, and the detected value of the second flow rate sensor S is a predetermined target value. Thus, the second flow rate control for automatically controlling the fin opening of the chaff sheave 25 is performed.

  As shown in FIGS. 3 to 5, the second reduction cylinder 23 forms a grain passage for second reduction from the terminal end of the second helix 18 to the second reduction port K, and in its interior, A helical transport body 28 for lifting and transporting the second object is rotatably mounted. Further, a discharge plate 29 for throwing the second object in the outer peripheral direction and an arc-shaped discharge guide 30 for discharging the thrown second object toward the second return port K are provided at the upper end of the spiral transport body 28. The second object conveyed to the upper end of the second reduction cylinder 23 is positively received from the second reduction port K by receiving the throwing action of the discharge plate 29 and the guide action of the discharge guide 30. To be released.

  As shown in FIGS. 3 to 6, the second flow rate sensor S of the present embodiment has a grain flow rate in a grain flow channel (second product discharge flow channel) formed at the terminal portion of the second reduction cylinder 23. The collision plate 31 that collides with the grain inside the grain flow path, the rotation member 32 that transmits the collision force acting on the collision plate 31 as rotative power, and the rotation A fulcrum shaft 33 that rotatably supports the member 32 and a pressure-sensitive sensor 34 that detects the rotational force of the rotating member 32 outside the grain flow path, are detected by the pressure-sensitive sensor 34. Is output as the second detected flow rate.

  More specifically, a mounting hole (not shown) for the second flow rate sensor S is formed in the top plate 23a of the second reduction cylinder 23, and the second flow rate sensor S is closed so as to close the mounting hole. A mounting plate 35 is attached. The mounting plate 35 is attached to the top plate 23a with mounting bolts 36 penetrating the long holes 35a. When the mounting bolts 36 are loosened, the second flow rate sensor S is changed by changing the position of the mounting plate 35 along the long holes 35a. It becomes possible to adjust the mounting angle.

  The mounting plate 35 is formed with a through-hole 35b through which the rotation member 32 can pass, and a plurality of support plates 38 are erected in a rectangular tube shape from the periphery thereof. The rotation member 32 is inserted into the support plate 38 erected in a rectangular tube shape, and the rotation member 32 is rotated by a fulcrum shaft 33 that penetrates the support plate 38 and the rotation member 32 from the side. It is supported movably. The fulcrum shaft 33 of the present embodiment is attached to the support plate 38 via a fulcrum shaft base 39 and a fulcrum shaft base mounting bolt 40, so that the position adjustment of the fulcrum shaft 33 is easy.

  The collision plate 31 is integrally provided at one end of the rotating member 32 located inside the grain channel. In the present embodiment, by arranging the collision plate 31 along the extension line of the discharge guide 30, grains having a relatively stable flow direction are caused to collide with the collision plate 31. A blower 41 is provided on the back side of the discharge guide 30, and the air collected by the blower 41 is blown away toward the sorting chamber.

  The pressure-sensitive sensor 34 is disposed so as to come into contact with the other end of the rotating member 32 located outside the grain channel. The pressure-sensitive sensor 34 of the present embodiment is attached to the support plate 38 via the sensor base 42 and the sensor base mounting bolt 43, and the pressure-sensitive sensor 34 can be easily adjusted and replaced. The contact surface of the rotating member 32 with the pressure sensor 34 is the same surface as the mounting surface of the collision plate 31. Further, an adjustment bolt 44 is in contact with the opposite surface, and a fine rotation range adjustment (backlash adjustment) of the rotation member 32 can be performed by the advance / retreat operation.

  As shown in FIG. 7, the combine 1 is equipped with a control device 45 comprising a microcomputer (including a CPU, ROM, RAM, calendar, etc.). On the input side of the control device 45, a preprocessing operation state detection sensor 46 that detects the operation state of the preprocessing unit 2, a threshing operation state detection sensor 47 that detects the operation state of the threshing sorting unit 3, and a traveling main shift lever A main transmission lever potentiometer 48 for detecting the operation position (not shown), a pre-processing potentiometer 49 for detecting the height of the pre-processing unit 2, Pretreatment depth main switch 50 for detecting presence / absence, moisture meter 51 for detecting the moisture content of the cutting material, T / M rotation sensor 52 for detecting the vehicle speed based on axle rotation, and fin opening of the chaff sheave 25 Is connected to the second flow rate sensor S described above, and on the output side of the control device 45, the fin opening degree of the chaff sheave 25 is changed. Opening adjustment motor 54 is connected.

  And in the control apparatus 45, the 2nd flow control which automatically controls the fin opening degree of the chaff sheave 25 is performed so that the detected value of the 2nd flow sensor S may become a predetermined target value. Specifically, when the detection value of the second flow rate sensor S exceeds the target value, the fin opening of the chaff sheave 25 is increased to reduce the flow rate of the second reduction product, while the detection of the second flow rate sensor S is performed. If the value is less than the target value, the fin opening of the chaff sheave 25 is decreased in order to increase the flow rate of the second reduced product, but such a control procedure is substantially the same as the conventional second flow rate control. The detailed flow and description of the second flow rate control are omitted.

  The present invention includes a cutting operation determination unit that determines whether or not the combine 1 is in a cutting operation state, and the second flow rate after the start of the cutting operation until the detected value of the second flow rate sensor S becomes a predetermined value or more. The second flow rate control start restricting means for restricting the start of control and the second flow rate control start restricting means restrict the start of the second flow rate control while the fin opening of the chaff sheave 25 is set to a predetermined opening according to the vehicle speed. And a fin opening degree maintaining means for maintaining at a time. According to such a combine 1, since the second flow rate control is started after the second reduced product reaches the position of the second flow rate sensor S, the second flow rate control is performed in a stable state regardless of material conditions and the like. Can start. In addition, the fin opening of the chaff sheave 25 is maintained at a predetermined opening according to the vehicle speed until the second flow rate control is started after the cutting operation is started. Smoothly while preventing excessive circulation of the second thing generated when the fin opening is too small with respect to the supply amount of the processed material leaking from 12, and undercirculation generated when the fin opening is too large It is possible to shift to the second flow rate control. This not only prevents an increase in power loss due to excessive circulation of the second item, an increase in third scattering, an increase in damaged particles, and damage to the second spiral 18 and the second flow rate sensor S. It is also possible to prevent delays in the start of automatic control due to undercirculation, deterioration of sorting performance, increase in branch shoots, etc.

  The second flow rate control start restricting means determines the above-mentioned default value when restricting the start of the second flow rate control until the detected value of the second flow rate sensor S becomes a predetermined predetermined value or more after the cutting operation is started. It can be set arbitrarily. For example, if the second flow rate control is started at the timing when the second reduced product reaches the position of the second flow rate sensor S after the cutting operation is started, the predetermined value is set to the minimum value, and the second flow rate sensor S The second flow rate control is started at the timing when a very small amount of the second reduced product is detected. If the second flow rate control is started after the amount of the second reductant is stabilized after the cutting operation is started, the predetermined value is set near the target value of the second flow rate control, and the second flow rate sensor S The second flow rate control is started at the timing when a sufficient amount of the second reduced product is detected.

  The fin opening maintaining means maintains the fin opening of the chaff sheave 25 when the vehicle speed at the start of the cutting operation is fast, and closes the fin opening of the chaff sheave 25 when the vehicle speed at the start of the cutting operation is slow. maintain. For example, the fin opening of the chaff sheave 25 is ranked into a plurality of stages, and the low speed range of the vehicle speed is divided into several stages. When the vehicle speed is the low speed range, the fin opening of the chaff sheave 25 is set to a small opening. The fin opening degree of the chaff sheave 25 is maintained at a larger opening degree as the vehicle speed increases.

  The mowing work determination means determines whether or not the mowing work state is based on the various states of the combine 1. Conventionally, the cutting operation state is determined based on whether or not the preprocessing depth main switch 50 is ON. In the present embodiment, whether or not the preprocessing unit 2 is in an operating state, a threshing selection unit 3 is in an operating state, whether the main shift lever is in the forward position, whether the height of the preprocessing unit 2 is equal to or less than a predetermined height, whether the preprocessing depth main switch 50 is ON. Based on this, the cutting operation state is determined in a composite manner. That is, when all of the above conditions are satisfied, it is determined that the state is the cutting work state for the first time, so it is possible to accurately determine whether the state is the cutting work state, and as a result, unnecessary control operations in the non-cutting work state can be performed. Can be prevented.

  Further, the control device 45 of the present embodiment includes a target second flow rate determining means, an inter-final fin opening succession means, and a controlling fin opening changing means in addition to the various means described above. The target second flow rate determining means is a means for determining the target second flow rate of the second flow rate control at the start of the cutting operation, and in this embodiment, based on the date of operation, the moisture content of the cutting material, and the vehicle speed. The target second flow rate of the second flow rate control is determined. Specifically, if it is determined that the month of August is based on the calendar in the control device 45, it is estimated that this is an extremely early rice cutting process that tends to cause branching, and the target second flow rate is set to a larger value. If it is determined to be October, it is estimated that it is a cutting work for standard wood, and the target second flow rate is set to the standard flow rate. Estimate that it is work, and set the target second flow rate to a low level. If it does in this way, the target 2nd flow volume can be set according to the time condition of a cutting material, and generation | occurrence | production of a branch infarction adhering grain and a damage grain can be suppressed.

  Further, the target second flow rate determining means determines the moisture content of the cutting material based on the detection value of the moisture meter 51, and increases or decreases the target second flow rate of the second flow rate control based on this moisture content. For example, when the moisture content of the cutting material is extremely large (for example, 30% or more), or when the moisture content of the cutting material is extremely small (for example, 15% or less), the target second flow rate is decreased to reduce the actual two The fin opening degree of the chaff sheave 25 is controlled so that the flow rate decreases or disappears. In this way, it is possible to suppress power loss due to excessive second reduction of the high moisture material and generation of damaged grains due to excessive second reduction of the low moisture material. The target second flow rate determining means of the present embodiment further determines the vehicle speed at the start of the cutting operation based on the detection value of the T / M rotation sensor 52, and based on the vehicle speed, the target second flow rate control target second flow rate control unit 2 determines the vehicle speed. Although the target flow rate is increased or decreased, the setting of the target second flow rate according to the vehicle speed is well known, and thus detailed description thereof is omitted.

The inter-stroke fin opening succession means sets the fin opening at the end of the previous stroke to the start of the next stroke without returning the fin opening of the chaff sheave 25 to the initial state when the cutting operation accompanying the movement between the strokes is interrupted. It is means to inherit. Specifically, the cutting operation state is determined based on the above-described conditions, and when the determination result is NO, the second flow rate control is temporarily stopped and fixed at the current fin opening. In this way, since the second flow rate control can be resumed in a stable state at the beginning of the next stroke, the unstable operation at the start of the control can be prevented and the sorting performance can be improved. In this embodiment, the fin opening is fixed on the assumption that the vehicle speed at the end of cutting in the previous stroke and the vehicle speed at the beginning of cutting in the next stroke are the same. When the vehicle speed at the start of cutting of the stroke is different, it is preferable to determine the fin opening at the start of cutting of the next stroke taking into account the difference in vehicle speed. For example, the fin opening rank of the next stroke is determined by the following equation.
Next stroke rank = previous stroke rank × ((next stroke vehicle speed + vehicle speed difference) / next stroke vehicle speed)

  The in-control fin opening changing means is configured to open the fin opening of the chaff sheave 25 by a predetermined amount in preference to the second flow control when the vehicle speed rapidly increases even when the second flow control is being executed. It is a means to offset to. According to such a means, even if the processing amount of the threshing selection unit 3 increases rapidly as the vehicle speed increases, overflow at the chaff sheave 25 can be prevented in advance and third scattering can be suppressed. Moreover, since the excessive circulation of the second thing can also be avoided, the damage of the second flow rate sensor S due to the excessive circulation of the second thing can also be prevented.

  The fin opening changing means during control of the present embodiment calculates a delay time until the processing amount of the threshing selection unit 3 increases correspondingly after the vehicle speed increases, and the fins of the chaff sheave 25 after the delay time elapses. The opening is offset to the opening side by a predetermined amount. This delay time can be obtained, for example, by adding the stalk and culm transport time to the threshing feed chain 9 by the preprocessing unit 2 and the stalk and culm transport time to the handling chamber 8 by the threshing feed chain 9. In this way, after the vehicle speed is increased, the fin opening of the chaff sheave 25 can be offset by a predetermined amount at the timing when the processing amount of the threshing selection unit 3 actually increases, so the offset is executed immediately after the vehicle speed is increased. As in the case, an instantaneous undercirculation state does not occur, and as a result, it is possible to prevent the occurrence of branch rachis adhering grains and the mixing of cut pieces.

  Next, a specific control procedure of the control device 45 constituting the various means as described above will be described with reference to FIG. As shown in this figure, the control device 45 first determines the start of the cutting operation by the cutting operation determination means (S101 to S104). Specifically, whether or not the preprocessing unit 2 and the threshing selection unit 3 are in an operating state (S101), whether or not the main transmission lever is in the forward position (S102), and the height of the preprocessing unit 2 is a predetermined height. It is determined whether or not it is below (S103), whether or not the preprocessing depth main switch 50 is ON (S104), and when all these determinations are YES, it is determined that the cutting operation has been started.

  When the start of the mowing operation is determined, the date reading (S105), the moisture content reading (S106), and the vehicle speed reading (S107) are performed, and based on these reading data, the second target of the second flow rate control is performed. The flow rate is determined (S108: target second flow rate determination means). Further, the fin opening of the chaff sheave 25 is set to a predetermined opening corresponding to the vehicle speed by the fin opening maintaining means (S109) described above. Next, it is determined whether or not the detection value of the second flow rate sensor S is equal to or greater than a predetermined value, and the start of the second flow rate control is restricted until the determination result is YES (S110: second flow rate control start restriction). means).

  When the detection value of the second flow rate sensor S becomes equal to or greater than the predetermined value, the second flow rate control is started (S111). During the execution of the second flow rate control, the vehicle speed signal is read (S112), and a rapid increase in the vehicle speed is determined (S113). If the vehicle speed increases rapidly, the fin opening corresponding to the vehicle speed increase is determined. (S114), a delay time (transport time) until the processing amount increases is calculated (S115), and after delaying by the delay time (S116), the fin opening of the chaff sheave 25 is opened to the open side. Offset (S117: fin opening changing means during control).

  Even during execution of the second flow rate control, whether or not the pretreatment depth main switch 50 is ON (S118), whether or not the height of the pretreatment unit 2 is equal to or less than a predetermined height (S119), It is determined whether or not the speed change lever is in the forward position (S120). If any of the shift levers is determined to be NO, it is determined that the operation is interrupted due to movement between strokes, and the current fin opening is inherited (S121: between strokes). Fin opening inheritance means). Moreover, if the pre-processing part 2 and the threshing selection part 3 will be in a non-operation state during execution of 2nd flow control (S122), control will be complete | finished.

  According to the present embodiment configured as described, the chaff sheave 25 that can change the fin opening, the second flow rate sensor S that detects the flow rate of the second reduced product, and the detection value of the second flow rate sensor S are used. And a second flow rate control means for automatically controlling the fin opening of the chaff sheave 25, a harvesting work judging means for judging whether or not the combine 1 is in a harvesting work state, and a harvesting work start After that, until the detected value of the second flow rate sensor S becomes a predetermined value or more, the second flow rate control start restricting means for restricting the start of the second flow rate control and the second flow rate control start restricting means are the second flow rate control. Since the fin opening degree maintaining means for maintaining the fin opening degree of the chaff sheave 25 at a predetermined opening degree corresponding to the vehicle speed is provided while the start of the second flow rate sensor S is restricted. Have you reached the position? Double-dip flow rate control is started. Thereby, the second flow rate control can be started in a stable state regardless of the material conditions and the like. In addition, the fin opening of the chaff sheave 25 is maintained at a predetermined opening according to the vehicle speed until the second flow rate control is started after the cutting operation is started. Smoothly while preventing excessive circulation of the second thing generated when the fin opening is too small with respect to the supply amount of the processed material leaking from 12, and undercirculation generated when the fin opening is too large It is possible to shift to the second flow rate control. This not only prevents an increase in power loss due to excessive circulation of the second item, an increase in third scattering, an increase in damaged particles, and damage to the second spiral 18 and the second flow rate sensor S. It is also possible to prevent delays in the start of automatic control due to undercirculation, deterioration of sorting performance, increase in branch shoots, etc.

[Second Embodiment]
Next, a processing procedure of the control device according to the second embodiment of the present invention will be described with reference to FIG. However, the description of the first embodiment is incorporated by attaching the same reference numerals as those of the first embodiment to the parts common to the first embodiment.

  As shown in FIG. 9, in the second embodiment, when the vehicle speed increases rapidly during execution of the second flow rate control, the fin opening of the chaff sheave 25 is not offset to the opening side by a predetermined amount. The first point is that the flow control gain (control sensitivity) is made sensitive over a predetermined period of time (or until the target second flow rate is entered) to cope with a sudden increase in the processing amount accompanying an increase in the vehicle speed. This is different from the embodiment. Specifically, when a rapid increase in vehicle speed is determined (S201), a delay time (transport time) until the processing amount increases is calculated (S202), and the gain of the second flow rate control is changed (S203). . Then, the second flow rate control (S204) with the changed gain is executed until a predetermined time elapses (S205). When the predetermined time elapses, the original gain is restored (S206), and the normal second flow rate control state is restored. . Even in this case, when the vehicle speed is increased, the overflow at the chaff sheave 25 can be prevented and the third scattering can be suppressed as in the first embodiment. Moreover, since the excessive circulation of the second thing can also be avoided, the damage of the second flow rate sensor S due to the excessive circulation of the second thing can also be prevented.

[Third embodiment]
Next, a processing procedure of the control device according to the third embodiment of the present invention will be described with reference to FIG. However, the description of the first embodiment is incorporated by attaching the same reference numerals as those of the first embodiment to the parts common to the first embodiment.

As shown in FIG. 10, in the third embodiment, when it is determined that the work is interrupted due to the movement between the strokes, the current fin opening is not inherited but the fin opening is fully opened after a predetermined time has elapsed. Is different from the first embodiment. Specifically, if any of S118 to S120 is determined to be NO, it is determined that the work is interrupted due to movement between strokes, and when a predetermined time has elapsed from this determination (S301), the fin opening of the chaff sheave 25 is fully opened. The fin opening degree adjusting motor 54 is actuated so as to become (S302). In this way, the grain easily leaks at the fin part, and there is no useless rotation of the grain in the second reduction that occurs when the work is interrupted between strokes, preventing damage to the grain and scattering of the third it can.
Note that if the supply of cereals to the handling chamber 8 is stopped due to the work interruption, the amount of second reduction will rapidly decrease from the state where the second reduction amount is large. Good.

It is a side view of a combine. It is an internal side view of a threshing selection part. It is a side view of a 2nd reduction | restoration cylinder. It is A arrow view of the 2nd reduction | restoration cylinder. It is A arrow sectional drawing of a 2nd reduction | restoration cylinder. It is a side view of the 2nd flow sensor. It is a block diagram which shows the input / output of a control apparatus. It is a flowchart which shows the process sequence of the control apparatus which concerns on 1st embodiment. It is a flowchart which shows the process sequence of the control apparatus which concerns on 2nd embodiment. It is a flowchart which shows the process sequence of the control apparatus which concerns on 3rd embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Combine 2 Pre-processing part 3 Threshing sorting part 23 Second reduction cylinder 25 Chaff sheave 45 Control device S Second flow rate sensor

Claims (1)

Chaff sheave that can change fin opening,
A second flow rate sensor for detecting the flow rate of the second reduced product;
A second flow rate control means for automatically controlling the fin opening of the chaff sheave based on the detection value of the second flow rate sensor;
A combine comprising:
A cutting operation determination means for determining whether or not the combine is in a cutting operation state;
No. 2 flow rate control start regulating means for regulating the start of No. 2 flow rate control until the detected value of the No. 2 flow rate sensor becomes a predetermined value or more after the cutting operation starts,
A fin opening maintaining means for maintaining the fin opening of the chaff sheave at a predetermined opening according to the vehicle speed while the second flow control start restricting means restricts the start of the second flow control;
The combine characterized by comprising.

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