JP2005049027A - Grain feeding device of grain dryer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make a grain dryer of grain circulation type to safely and efficiently execute drying control by enhancing abnormality detection accuracy of feeding valve rotation to determine feeding abnormality and to stop drying operation while continuing the drying operation as long as possible even if some abnormality of the feeding valve rotation is caused while checking rotation situation of a feeding valve in a drying room. <P>SOLUTION: In the grain dryer for drying grains while circulating feeding grains by driving the feeding valve 4 which receives the grains for flowing down from a stock room 1 via a drying room 2 and feeding them to a grain collection room 3 every predetermined cyclic time T in a manner alternatively repeating regular rotation and opposite rotation, operation is continued when a regular rotation number n in the predetermined cyclic time T is detected and determination of abnormality of clogging is enabled when the regular rotation number n is not detected. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a grain feeding device in a grain dryer in a grain circulation form.

  The to-be-dried grain flows down in a predetermined manner by the rotation of a feed valve provided below the drying chamber, and is dried by receiving dry hot air flowing from the hot air chamber toward the exhaust chamber. Grain drying is intended to ensure grain quality by slowly drying until reaching the specified moisture level, but at the end of drying, the quality is less likely to be degraded compared to high moisture grains, so the drying rate does not cause this degradation. To finish drying. That is, as the detected value of the grain moisture during drying decreases, a technique for increasing the circulation speed while increasing the hot air temperature and ensuring a predetermined drying rate is known (for example, see Patent Document 1).

Moreover, when the drive current value of the motor that drives the harvesting auger in the harvesting room continues for a predetermined time to a predetermined value or more, the feeding speed of the feeding valve is changed to a speed that is slower by a predetermined time. A technique is known that reduces the feeding speed by reducing the feeding speed depending on the load condition of the conveying means (the cereal collecting auger) (for example, see Patent Document 2).
JP 2002-122381 A Japanese Patent Laid-Open No. 2001-241846

  In the grain dryer of the grain circulation form, when the circulation of the grain is stopped, drying unevenness is likely to occur or overdrying tends to occur. Further, if the drying is stopped when such circulation is difficult to be performed, the drying efficiency, efficiency, and the like are significantly reduced. The present invention continues the drying operation as much as possible without immediately stopping the drying even if a slight change occurs in the rotation of the feeding valve while checking the rotation state of the feeding valve under the drying chamber at the starting position of the circulation. In this way, the abnormality detection accuracy of the feeding valve rotation is increased, the feeding abnormality is judged, or the drying is stopped, so that safe and efficient drying control is performed.

  According to the first aspect of the present invention, the feeding valve 4 that receives the grain flowing down from the storage chamber 1 through the drying chamber 2 and feeds it to the cereal collection chamber 3 is rotated forwardly and reversely at every predetermined cycle time T. In a grain dryer that dries while circulating the fed grain, and continues to operate when the specified rotational speed n is detected within the predetermined cycle time T, and is not detected. In some cases, it is possible to determine whether or not clogging is abnormal. As a result, the grain flowing down the drying chamber 2 by the rotation of the feeding valve 4 is heated by receiving hot air and fed to the mashing chamber 3. The grain collection room 3 is returned to the storage room 1 through a grain collection auger, a grain raising machine or the like, and the grain drying is performed while being circulated. The feeding valve 4 is driven to rotate forward at a predetermined cycle time T, feeds the grain in the drying chamber 2 to the lower harvesting chamber 3, and is driven to rotate backward at the subsequent cycle time T. Is repeated, and this is repeated. Moreover, at the time of such a feeding action, the rotational speed of the feeding valve 4 is detected by a valve sensor or the like, and the presence / absence of the specified rotational speed n is detected every predetermined cycle time T. When the specified rotation speed n is detected within the period time T, the operation is continued as if there is no abnormality, but when the specified rotation speed n is not detected within the period time T, an abnormal grain clogging is determined. The processing control is continued as there is a possibility of this.

  According to the second aspect of the present invention, when the specified rotational speed n within the cycle time T is not detected, a monitoring time α that is extended by a predetermined time is further set thereby, and the specified rotational speed n is set within the monitoring time α. If detected, the operation is continued, and if not detected, it is determined that the clogging is abnormal. When the grain drying action as described above, the drive control of the feed valve 4 and the abnormality determination control of the drive of the feed valve 4 are performed, but the specified rotational speed n is not detected within each predetermined cycle time T Determines whether the specified rotational speed n has been detected even within the extended monitoring time α. If the specified rotational speed is detected, the operation is continued, and if it is not detected, it is determined that there is a clogging abnormality. It is. The feeding valve 4 is stopped or the drying operation is stopped by determining the abnormality.

  According to a third aspect of the present invention, when the state where the specified rotational speed n is not detected continues two or more times, it is determined that there is a clogging abnormality. The grain drying action as described above, the drive control of the feed valve 4 and the abnormality determination control of the drive of the feed valve 4 are performed. However, the specified rotational speed n is not detected within each predetermined period T. Or, if the specified rotational speed n is not detected within the cycle time T and the monitoring time α, the specified rotational speed n is not detected in two or more consecutive times, that is, in either the forward rotation or the reverse rotation. Sometimes it is determined as clogging abnormality.

  The invention according to claim 4 is characterized in that the cycle time T is determined by measuring the time required for the specified rotational speed n in the initial stage of operation. At the initial stage of operation, the feeding valve 4 is driven and rotated to feed the grains in the drying chamber 2 and the time required to obtain the specified rotational speed n is measured to determine the predetermined cycle time T.

  The invention according to claim 5 is provided with a detecting means for determining whether or not the grain is in a circulating state other than the feeding valve 4, and when it is determined by this detecting means that there is no grain circulation, the feeding valve 4. The grain feeding device of the grain dryer according to claim 1, 2, 3, or 4, characterized in that drying is stopped as an abnormal grain clogging in the conveying means from the detection means to the detection means. It is. Therefore, when it is determined that there is no grain circulation by detecting the grain circulation other than the feeding valve 4, the drying is stopped as an abnormality. The determination of the abnormality detection due to the rotation failure of the feeding valve 4 is performed as described above, and the abnormality determination with high accuracy is performed while continuing the operation as much as possible. In the grain circulation system, in addition to the feeding valve 4, a grain auger that transports the grain fed from the feeding valve 4 in the grain collection chamber 3, and receives the grain collection and returns it to the storage chamber 1. There is a groining machine. A moisture meter or the like for detecting moisture by intermittently sampling a part of the grain during the ascending is provided, and the presence or absence of the circulation of the grain can be detected by this moisture meter. When the circulation of the grain is stopped by detecting the presence or absence of the grain circulation in the grain circulation system other than the feeding valve 4, the grain is likely to be overdried. Is determined to be abnormal regardless of whether the feeding valve 4 is abnormal or not, and drying is stopped, assuming that there is no immediate grain circulation.

  In the first aspect of the invention, the feeding of the grain by the feeding valve 4 may differ depending on the state and type of the grain, but the feeding valve 4 performs forward rotation and reverse rotation every predetermined cycle time T. Therefore, the feeding can be smoothly carried out by reducing mixing of straw scraps and foreign matters, clogging due to a high moisture ratio, and bridging phenomenon. In addition, since the reference value of the specified rotational speed n is set for each cycle time T while maintaining such a state, even when the rotational speed changes due to some cause as described above, it is finely detailed. Continue the operation without judging the abnormality or stop the drying operation, limit and limit the chance of abnormality judgment of the feeding valve 4 to maintain high abnormality detection accuracy, improve safety, accurate and stable Drying control can be maintained.

  According to the second aspect of the present invention, by providing a monitoring time α that is appropriately extended to the predetermined cycle time T, a specified rotation within the cycle time T due to a temporary change in the rotation speed of the feeding valve 4 or the like. When the detection of the number n is not in time, the abnormality determination is performed by the detection until the monitoring time α, and the accuracy of the abnormality determination can be further improved.

  According to a third aspect of the present invention, the clogged state continues for a long time when the detection of the specified rotational speed n of the feed valve 4 continues twice or more within a predetermined cycle time T to the monitoring time α. As described above, it is possible to maintain high abnormality detection accuracy, improve safety, and maintain accurate and stable drying control. In other words, the clogging phenomenon may be avoided depending on the subsequent rotation from the forward rotation to the reverse rotation or from the reverse rotation to the forward rotation. Therefore, not only a single abnormality detection but also an abnormality detection at least twice or more. Therefore, it becomes impossible to avoid the clogging phenomenon, and the abnormality detection accuracy is improved.

  In the invention according to claim 4, the predetermined cycle time T and the monitoring time α are determined by measuring the time required for one rotation of the feeding valve 4 in the initial stage of the drying operation. In addition, it can be determined based on the rotation time according to operating conditions such as power supply frequency, increase / decrease in driving torque of the motor, etc., and accurate abnormality determination can be performed with high accuracy.

  According to the fifth aspect of the present invention, in the abnormality determination through the rotation drive of the feeding valve 4 or the control of the drying stop, the abnormality detection accuracy of the feeding valve drive is improved and the drying efficiency and efficiency are improved while maintaining the operation continuation as much as possible. In addition to improvement, in the detection of circulatory abnormality in the grain circulation system other than this feeding valve 4, since the establishment of the abnormality is large, the drying is immediately stopped as an abnormality without causing overdrying, etc. Quality deterioration can be prevented and safe drying can be performed.

  Even when the rotation speed changes for some reason, abnormal detection is limited and limited without limiting the opportunity for determining abnormalities in the feeding valve by continuing the operation without stopping the drying operation. We realized a grain drying device that maintains high accuracy, increases safety, and maintains accurate and stable drying control.

  In the illustrated grain dryer, a substantially upper half of a box-shaped drying basket 7 is used as a storage chamber 1, and a drying chamber 2, a cereal collection chamber 3, etc. are formed in the lower half of the storage room 1. Between the one end part of the grain collecting auger 8 provided in the center lower part and the upper auger 9 above the storage chamber 2, the grower 10 is continuously provided along the front wall of the drying basket 7. The drying chamber 3 is provided with inner and outer ventilation plates 11 and 12 having ventilation holes formed on both left and right sides in parallel, and is configured in a V shape in front view. A hot air chamber 13 is formed between the left and right drying chambers 3. A V-shaped grain collection chamber 3 and a grain collection board 14 are provided on the outer side. An upper portion of the drying chamber 2 is provided with a W-shaped guide plate 15 in a front view so as to have a funnel shape, and the grains flowing down the storage chamber 2 are guided down to the left and right drying chambers 2.

A burner 16 is provided on the front wall of the drying basket 7 so that hot air can be blown into the hot air chamber 13. Further, a wind exhaust path 17 communicating with the left and right cereal collection chambers 3 is formed on the rear wall, and the exhaust fan 18 is communicated. A far-infrared radiation device 19 is provided along the hot air chamber 13 and includes a pair of left and right semi-cylindrical plates 20, and appropriate spacing portions 21 and 22 are formed between the upper and lower opposing edge portions. By blowing hot air from the burner 16 along the ventilation path 25 between the pair of left and right half-cylindrical plates 20, far-infrared radiant heat is generated. The grain is dried by applying this far-infrared radiant heat to the grain flowing down the drying chamber 2 and the like. A diffusion plate 23 receives and rotates the grains supplied from the upper auger 9. 24 is a moisture meter provided at an intermediate position of the groining machine 10 and detects moisture while taking in some grains during cerealing at regular time intervals, and also detects the presence or absence of cereal grains. be able to. ***
A shaft 28 is provided with the feeding valve 4 extending in the front-rear direction along the lower end feeding port 26 of the drying chamber 2 having a V-shaped cross section in the front view. The feeding valve 4 is driven by a forward / reverse rotating electric motor 27 provided on the back wall side. The feeding valve 4 forms a valve opening 29 having a predetermined width in a direction along the shaft 28 in a part of the cylindrical shape, and allows the grain to flow into the lower drying chamber 2 when facing the upper drying chamber 2 by rotation. When facing the 3 side, this grain is caused to flow out and the grain is fed out. Reference numeral 30 denotes a bearing plate for bearing both ends of the valve shaft 28, which is attached to the front wall, back wall, etc. of the drying basket 7. The shaft 31 of the motor 27 can be interlocked by fitting the tip of the valve shaft 28 with a socket. A magnet 32 is fixed to the valve shaft 28, and a reed switch 33 having an electromagnetic coil is provided on a part of the back wall of the rotating outer periphery of the magnet 32. The valve rotation sensor 34 is connected to the magnet 32 and the reed switch 33. Constitute. The motor 27 can rotate forward and backward, and can rotate the feeding valve 4 in the forward direction or in the reverse direction.

  For the drying control, combustion is performed on the input side of the controller 40 by a tension switch 42 for tensioning the grain into the drying chamber 2 and the storage chamber 1, a ventilation switch 43 for ventilating the drying chamber 2, and the burner 16. A drying switch 44 for blowing the heated hot air to the drying chamber 2 for drying, a discharge switch 45 for discharging the dried grain outside the apparatus, a stop switch 46 for stopping the drying operation, and the like are provided. Further, moisture detection means such as a moisture meter 24, grain flow detection means, outside air temperature detection means 47, hot air temperature detection means 48 and the like are provided. Further, on the output side of the controller 40, a valve motor 27 for driving the feeding valve 4, each motor 49 of a grain circulation conveyance system such as the grain collecting auger 8, the upper auger 9, and the grain raising machine 10, A combustion system output 50 such as a burner 16 motor and a pump, a suction fan motor 51 such as an exhaust fan 18, and a liquid crystal display 52 are provided.

  Further, a control box 36 is provided on the front wall portion of the drying basket 7, and the switches 42, 43, 44, 45, 46, the display unit 52, and the like are arranged on the operation plate 35. The display unit 52 can digitally display the hot air temperature, moisture, remaining time for drying, and the like. 37 is an emergency stop switch for urgently stopping the drying action, 38 is a tension amount setting scale for setting the grain amount, 39 is a grain moisture setting scale, and 41 is a drying speed. The drying setting scales 53 and 54 are timer setting switches. In addition, a moisture variation lamp 55 for displaying the state of dried grains, an immature rice lamp 56 for displaying the mixing state of immature rice, and the like are arranged. For the drying operation, after turning on the sticking switch 47 and storing the grains in the storage chamber 1 or the like, the switches such as the drying switch 44, the ventilation switch 43, and the grain collecting auger 8 are turned on, and the valve motor 27 is rotated to dry. This is done by feeding the grain in the chamber 2 to the collecting chamber 3 and circulating it.

The rotation speed of the feeding valve 4 is determined by counting the number of pulses that are output by the valve rotation sensor 34 when the reed switch 33 is turned on (FIG. 1). The forward rotation drive and the reverse rotation drive of the valve motor 27 are set so as to be output as a predetermined cycle time T, and the specified rotation speed n of the feeding valve 4 within each cycle time T is set, for example, as n = 4 rotations. The The period time T1 of each actual measurement when the normal rotation or the reverse rotation of the specified rotational speed n is detected within each period time T.
, T2 and T3 indicate a state in which normal feeding is performed, but when the specified rotational speed n is not reached (detected rotational speed = 0 to 3 revolutions), an abnormal feeding state occurs. That is, it indicates that the feeding valve 4 is in a rotation stop state or the rotation speed is in a lowered state for some reason or reason. As described above, when the rotation speed of the supply valve 4 within the cycle time T is less than the specified rotation speed n, the cycle time T is further extended by α to be a monitoring time. When the number n is not detected, an abnormality occurs. When such an abnormal state is detected twice in succession, it is determined as abnormal and processed.

  Factors for stopping the driving of the feeding valve 4 include not only overload due to the state of grains and the like, but also variations in the valve motor 27 and insufficient torque as operating conditions. Further, the rotation failure of the feeding valve 4 includes a grain leakage prevention rubber or a bite of a seal or the like at the feeding port 26 part, and a foreign matter such as stone gravel. In this case, the rotation of the feeding valve 4 may be slow, or even if a stop is detected in the first to first cycle time, it may be canceled and rotated in the second to second cycle time. For this reason, the time (for example, α = 10 seconds) in consideration of a decrease in the rotational speed due to a factor such as a decrease in torque of the valve motor 27 can be added to the constant cycle time T.

  Here, the driving process control of the feeding valve 4 is performed according to the control flow shown in FIG. When the feed valve 4 is rotated forward, the normal rotation routine F is followed. When the feed valve 4 is rotated reversely, the reverse rotation routine R is followed. In any of these routines F and R, processing is performed through steps 1 to 5, step 6, and the like. When the valve rotation sensor 34 detects the specified rotation speed n = 4 rotations within a predetermined cycle time T (step 1), the drive of the delivery valve 4 in the next stroke is set in the reverse rotation direction (step 2), and the delivery valve 4 can be rotated to continue the drying operation. If the specified rotational speed n = 4 rotations cannot be detected in step 1, the monitoring time α is further extended to see whether the specified rotational speed n has been detected before this time elapses (step 3). If it is detected, the process proceeds to step 2 to proceed to the reverse rotation driving process in the next stroke. However, when these specified rotational speeds n are not detected, the current abnormality is compared with the presence or absence of the previous abnormality detection (step 4). . Here, when there is no abnormality detection in the previous time, the valve drive of the next stroke is set to reverse rotation, but when there is an abnormality detection in the previous time, the abnormality detection continues twice continuously with the current abnormality detection. Therefore, it is determined that there is a serious abnormality such as clogging or the like in the feeding by the feeding valve 4, the fact is displayed on the display unit 52, the driving of the feeding valve 4 is stopped (step 6), and the drying action When it is inside, the drying is gradually stopped (purge stop) over a long period of time, and when it is not during drying, it is immediately stopped (step 5). In Step 3, when the monitoring time α is not provided and the specified rotational speed n within the cycle time T is not detected, and abnormality detection continues twice (Step 4), it is determined that the valve is abnormal. (Step 5) can also be performed (see FIG. 10 described later).

  Next, FIG. 9 differs from the above example in that the cycle time T of the drive control of the feed valve 4 is automatically or manually set by actual measurement of the specified rotational speed n. At the start of the drying operation, the valve rotation sensor 34 measures the time required for the delivery valve 4 to make one rotation, that is, the time from the output ON to the valve rotation sensor 34 ON (step 1). The monitoring time t for determining the clogging abnormality is corrected by this time. A cycle time T for detecting the specified rotational speed n is set based on the monitoring time t (step 2). By setting the monitoring time t as described above, the abnormality processing can be performed by detecting the specified rotational speed n in the cycle time T as described above (step 3), and the time required for one rotation is measured and the subsequent operation is performed. Time clogging can also be determined (step 4). Thus, by determining the monitoring time by measuring the rotation time under the driving conditions, it is possible to determine an appropriate abnormality.

  Next, FIG. 10 is different from the operation of FIG. 3 in particular in that the moisture flow is detected by the moisture meter 24 and the abnormality determination of the rotation of the feeding valve 4 is controlled. In the control flow process, steps 1 to 5 of the normal rotation and reverse rotation routines F and R and step 6 are the same as those in FIG. 3, but the following steps 7 to 9 are different. That is, reading of the moisture meter 24 (step 7) and detection of whether or not the grain raising circulation of the grain raising machine 10 by the moisture meter 24 is performed (step 8), thereby the grain circulation. When there is no error, the operation is stopped as an abnormality (step 9). Further, in this case, the abnormality determination is performed based on whether or not the supply valve 4 has a specified rotational speed n within the cycle time T. During drying, the moisture meter 24 is driven at regular intervals to detect the presence or absence of the circulation of the grain. If the grain is not circulated, it is stopped as an abnormality. Thereby, the detection accuracy of the drive abnormality of the feeding valve 4 or the like can be increased. Moreover, even if there is a poor circulation of the grain due to the transmission belt of the grain auger 8, etc., this is detected and the operation is stopped by the abnormality judgment, so the quality deterioration can be prevented by eliminating the overdried grain. The continuity of the drying operation can be increased. Such detection of the presence or absence of circulation can be provided with a conveyance sensor that directly detects the presence or absence of the conveyance of grains such as the groining machine 10, the harvesting auger 8, or the upper auger 9 instead of the moisture meter 24.

  Next, with reference to FIGS. 11 and 12, regarding the mounting structure of the valve rotation sensor 34, the valve motor 27 is mounted on the back wall portion of the drying basket 7 with a bracket 55 having a U-shaped cross section interposed. The motor shaft 31 is connected to the valve shaft 28, and a valve rotation sensor 34 is provided. On the front side of the bracket 55, the ribs 56 on both the left and right sides are fastened to the surface of the drying basket 7 with bolts 57. The motor 27 is attached to the rear side surface of the bracket 55 with bolts 58. The tip portions of the motor shaft 31 and the valve shaft 28 are inserted into the bracket 55, and coupled so as to rotate integrally with the coupling joint 59. The magnet 32 of the valve rotation sensor 34 is provided at the coupling joint 59. The upper and lower covers 60 and 61 are attached to the upper and lower open portions of the bracket 55 by fastening bolts 62 and 63, and the reed switch 33 is attached to the upper cover 60. A valve rotation sensor 34 is configured. Further, the reed switch 33 can be mounted on the lower cover 61 side. Reference numeral 64 denotes a coupler of the reed switch 33. Reference numeral 65 denotes a seal provided on both left and right edges of the outlet 26, which is attached to the lower end portion of the ventilation plate 12 and is slidably contacted with the rotating peripheral surface of the outlet valve 4.

  Next, with reference to FIGS. 13 to 15, in the valve seal 65 of the feeding valve 4 provided along the left and right side edges of the feeding outlet 26, a belt-like shape formed from an elastic material such as a urethane resin material or a rubber material. An attachment portion 66 having a trapezoidal or rectangular cross section is formed along the base portion of the valve seal 65, and the attachment portion 66 of the valve seal 65 is formed on the seal holder 68 on the drying frame 67 side to which the ventilation plate 12 is attached. It can be fitted and fitted in the insertion groove 69. Further, the valve seal 65 can be easily replaced when worn due to the insertion form of the valve seal 65 into the insertion groove 69. Further, in order to form the insertion groove 69 portion, the seal holder 68 is formed by alternately bending the sheet metal plate edges 70 and 71 in a sawtooth shape up and down to form a hook shape. 71, the insertion groove 69 is formed. The plate edge 70 is made long, the plate edge 71 is made short, and a notch 72 having an appropriate interval is formed between them. Such a configuration of the insertion groove 69 is simple, and the mounting portion of the valve seal 65 can be clamped by caulking both the plate edges 70 and 71, so that it is difficult to remove and a stable mounting configuration can be obtained.

  Next, with respect to FIG. 16, LED lamps 73 are provided at the respective operation portions of the operation panel 35 so that the combustion state during the drying operation, the pause, and the purge can be distinguished by lighting the lamps 73. Is. In particular, it is possible to recognize that the operation is being performed after the drying switch 44 is turned ON and that the combustion output is being performed. From the time when the drying switch 44 is turned on until the combustion is output, the lamp 73 is continuously lit, and during the combustion output, it is configured to blink according to the fuel ON time.

  Each switch and display item of the operation panel 35 is provided with an LED lamp so as to light up and display each item during work. Among these, the lamp 73 of the drying switch 44 is continuously lit during operation or lit in a blinking manner to distinguish and display the work state. In this continuous lighting, after the drying switch 44 is turned ON, until the control pump output for the burner 16 fuel is displayed, the drying operation paused by the timer unit, the post purge, etc. are displayed. In addition, in the blinking lighting, the output of the control pump is displayed. Depending on the on-time of the control pump, the lighting time can be divided and displayed in several stages at a constant cycle.

The detection time chart by the rotation sensor which shows the drive state of a delivery valve | bulb. The schematic block diagram of the drying control. The drive control flowchart of the part delivery valve | bulb. The disassembled perspective view of the delivery valve part. The front view of the grain dryer. FIG. The perspective view of the partial far-infrared radiation device part. The front view of the control box. The flowchart of the delivery valve drive control which shows another Example. The flowchart of the delivery valve drive control which shows another Example. The side view of the valve motor attachment part which shows another Example. The rear view. The front view of the delivery valve | bulb part which shows a part another Example. The enlarged front view of the valve seal part. The side view of the seal holder part, a partial enlarged view, and its front sectional view. The front view of the operation part which shows another Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Storage chamber 2 Drying chamber 3 Grain collection chamber 4 Feeding valve T Period time n Specified rotation speed α Monitoring time

Claims (5)

The feeding valve 4 that receives the grain flowing down from the storage chamber 1 through the drying chamber 2 and feeds it to the harvesting chamber 3 is alternately and repeatedly driven forward and reverse every predetermined cycle time T, In the grain dryer that dries while circulating the fed grain, the operation is continued when the predetermined rotational speed n is detected within the predetermined cycle time T, and the clogging abnormality can be determined when it is not detected. A grain feeding device characterized by that. When the specified rotational speed n within the cycle time T is not detected, a monitoring time α of a certain time extension is further set thereby, and if the specified rotational speed n is detected within the monitoring time α, the operation is continued. The grain feeding device of the grain dryer according to claim 1, wherein when it is not detected, it is determined that clogging is abnormal. The grain feeding device of a grain dryer according to claim 1 or 2, wherein when the state where the specified rotational speed n is not detected continues twice or more, it is determined that the clogging is abnormal. The grain feeding device for a grain dryer according to claim 1, 2, or 3, wherein the cycle time T is determined by measuring a time required for a specified rotational speed n in the initial stage of operation. A means for detecting whether or not the grain is in a circulating state other than the feeding valve 4 is provided, and when it is determined by this detecting means that there is no grain circulation, in the conveying means from the feeding valve 4 to the detecting means. The grain feeding device of a grain dryer according to claim 1, 2, 3, or 4, wherein drying is stopped as an abnormal grain clogging.

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