JP2010127551A - Grain dryer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To smoothly perform ventilating circulation of charged grain and new charging work in charging operation of a circulation type grain dryer. <P>SOLUTION: The grain dryer is constituted to enable switching to a hot air circulation drying process and a ventilating circulation drying process. Control is performed by a controller as follows: when an input charged grain detection means detects that no grain is charged and input during grain charging performed by driving an elevating machine for charging operation, the grain dryer transfers to the ventilating circulation drying using a delivery means, and when the input charged grain detection means detects that grain is charged and input during ventilating circulation of the charged grain, the ventilating circulation drying is stopped to transfer to the charging operation stopping the drive of the delivery means. When the ventilating circulation drying is stopped during the charging operation, the delivery means is stopped first, and then, when a moisture meter detects termination of taking-in of sample grain, the elevating machine is stopped. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a circulation type grain dryer.

In the circulation type grain dryer, when it is detected that the squeezed grain has been lost, it is known that the circulation quality is circulated while feeding the squeezed grain in the storage chamber to prevent deterioration of grain quality (patent) Reference 1).
JP 2008-51398 A

  The present invention relates to a circulation type grain dryer, which prevents the clogging of the elevator when the ventilation circulation while drawing the tensioned grain in the storage chamber is finished and resumes the next tensioning work. The work is to be resumed smoothly.

According to the first aspect of the present invention, dry hot air generated by mixing the combustion heat of the burner (5) and the outside air is circulated from the upper storage chamber (2) to the lower drying chamber (3) while drying the grains. 3) In the circulation type grain dryer which is sent to and dried,
Feeding means (10) for feeding the grain of the drying chamber (3) to the lower gathering room (4), and the grain fed to the gathering room (4) or the loaded grain input port. Elevator (11) for cerealing the squeezed kernel into the storage chamber (2), and moisture for detecting the sample moisture content or the presence or absence of the incorporated cereal by taking in the sample grain from the cereal grain of the elevator (11) A total (26) and an input overhanging grain presence / absence detection means (SE7) for detecting the presence or absence of the overhanging grain are provided, and the drying hot air generated by the combustion heat of the outside air and the burner (5) is supplied to the drying chamber (3 ) And a ventilating circulation process for supplying only the outside air to the drying chamber (3), and the above-mentioned inserted squeezed grain presence / absence detecting means during squeezing the grain in the squeezing mode When (SE7) detects no overhanging input grain, the driving means (10) is driven. When the process moves to the wind circulation process and the input overhanging grain presence / absence detection means (SE7) detects the presence of the overhanging input grain during the ventilation circulation of the overhanging grain, the aeration circulation process and the feeding means (10) are performed. When the stopped tension mode operation is started and the ventilation circulation process is stopped, the feeding means (10) is first stopped. Then, when the moisture meter (26) does not take in the sample grain, the elevator (11 ) Is provided with a controller (41) to stop the grain dryer.

  According to the said structure, during the grain tension to the storage chamber (2) which stopped the feeding means (10) in the tension mode and driven the elevator (11), the input tension grain presence detection means (SE7) When the presence of the stretched grain is detected, the process moves to a ventilation circulation process in which the feeding means (10) is driven, and ventilation circulation drying is started in which the outside air is bathed in the grain while feeding the grain in the storage chamber (2). Further, when the input stretched grain presence / absence detecting means (SE7) detects the presence of the stretched input grain during the circulation of the grain, the feeding means (10) and the ventilation circulation process are stopped, and the elevator (11) is driven. A tensioning operation is carried out in which the squeezed cereal input grains are cerealed in the storage chamber (2). Further, when stopping the ventilation circulation process while feeding out the grain in the tension mode, the feeding means (10) is stopped first, and then the elevating machine (11) when the moisture meter (26) stops taking in the sample grain. ).

  The invention according to claim 1 includes a ventilation circulation step of feeding out the grain while reducing the moisture unevenness of the grain in the storage chamber (2) and preventing the quality deterioration of the grain even during the grain filling operation. When the tensioning operation is resumed after completion, the graining of the elevator (11) can be prevented and the tensioning operation can be resumed smoothly.

Embodiments of the present invention will be described below with reference to the drawings.
First, based on FIG.1 and FIG.2, the whole structure of the circulation type grain dryer which comprises this invention is demonstrated.

  Reference numeral 1 denotes a machine frame of a dryer. In the machine frame 1, a storage chamber 2, a drying chamber 3, and a grain collection chamber 4 are sequentially arranged from the upper side to the lower side. A plurality of grain flow passages 9 and 9 are formed in the drying chamber 3, and hot air chambers 6 and 6 leading to the burner wind tunnel of the burner 5 are disposed on the left and right sides of the left and right grain flow passages 9 and 9. Exhaust chambers 8 and 8 leading to the fan body of the suction exhaust fan 7 are arranged on the left and right other sides of the grain flow down passages 9 and 9, and feeding valves 10 are respectively provided at the lower ends of the grain flow down passages 9 and 9. Yes.

  In addition, a far-infrared radiator 4 a is disposed in the central exhaust chamber 8 located in the middle part of the left and right grain flow passages 9 and 9 in the exhaust chamber 4. This far-infrared radiator 4a is composed of left and right side plates and a bottom plate along the front-rear direction and coated with a far-infrared radiation paint. The grain is exposed to far-infrared radiant heat to accelerate the drying of the grain. Further, the radiant heat of the far-infrared radiator 4a is configured to flow into the exhaust chamber 8 through the upper grain flow passages 9 and 9 while being mixed with the outside air introduced from the front side and the rear side of the machine body. Yes. Further, the reciprocating rotation of the feeding valve 10 causes the grain to flow down while being fed out by a predetermined amount, and the grain is dried by soaking in hot air.

  In addition, a roof-type dust exhaust plate 4b is provided above the far-infrared radiator 4a, and mixed hot air and hot air are mixed on the left and right sides while preventing dust from falling on the far-infrared radiator 4a from above. It is configured so as to be detoured and guided upward.

  On the outer side of the machine frame 1, an elevator 11 is erected to reduce the grains collected on the front and rear sides of the cereal collection chamber 4 to the storage chamber 2. A bucket belt 13 is wound around the upper and lower drive pulleys 12 a and driven pulley 12 b in the elevator 11, and dried grains are transferred to the front and rear sides by a lower conveying device 14 provided at the bottom of the cereal collection chamber 4. It is configured to cereal. The grain that has been cerealed by the elevator 11 is supplied to the starting end side of the upper conveying device 16, and is further laterally fed by the upper conveying device 16 and sent to the rotary diffusion plate 18 disposed in the upper central portion of the storage chamber 2, The storage chamber 2 is configured to be diffused and dropped.

  The grain circulation system composed of the elevator 11, the lower transfer device 14, and the upper transfer device 16 is driven by an elevator motor (not shown) disposed on the upper frame of the elevator 11. Further, a moisture meter 26 is provided on the wall surface of the elevator 11 in the middle of the upper and lower parts, sample grains are taken in from intake ports (not shown) provided in the interval between the ascending stroke and the descending stroke of the bucket belt 13, and the moisture value is measured. It is configured as follows. The moisture meter 26 is a known device that compresses and pulverizes sample particles one by one between a pair of electrode rolls, for example, and electrically converts the resistance value into a moisture value for each particle.

Next, normal drying control of the dryer will be described.
A predetermined amount of grain is put into the storage chamber 2 by using the elevator 11 from a holding hopper (not shown). Next, the drying operation is performed with the combustion controlled by the combustion amount corresponding to the grain type, the dry finish moisture value, the drying speed, the automatic detection or the manually set grain insertion amount. The grains in the storage chamber 2 are dried while bathing hot air while flowing down the grain flow passages 9, 9 of the drying chamber 3 and flow down to the collection chamber 4. The dried grain is transferred to one side by the lower conveying device 14, then cerealed by the elevator 11, taken over by the upper conveying device 16, and circulated again to the storage chamber 2, where it undergoes a tempering action for a while. When the moisture value measured by the moisture meter reaches the final moisture value while repeating such a process, the drying operation is finished.

Next, the operation panel 31 of the dryer will be described with reference to FIG.
On the panel surface of the operation panel 31, a tension switch SW1 for starting grain loading, a drying switch SW2 for starting combustion of the burner 5 and driving the feeding valve 10 to start drying work, and grains in the storage chamber 2 are placed. A discharge switch SW3 for discharging outside the machine, a stop switch SW4 for stopping various driving of the machine body, a grain type setting switch SW5 for selecting and setting a grain type for drying, a moisture value setting switch SW6 for setting a finishing moisture value, and an extension Dial-type extension amount setting switch SW7 for selecting manual setting of amount ("0" to "7") or automatic detection ("automatic"), timer increasing switch SW8 for increasing drying time, timer for decreasing drying time Decrease switch SW9, moisture correction switch SW10, manual measurement switch SW11 for manually measuring the moisture value of the grain with moisture meter 26, hot air temperature setting switch SW12, hot air Degree adjustment switch SW13, drying speed setting switch SW14, initial drying time setting switch SW15, pause time setting switch SW16, reserved drying on / off switch SW17, inspection on / off switch SW18, exhaust air fan on / off switch SW19, emergency stop switch SW20, Various operation switches of the buzzer stop switch SW21, a display unit 32 that digitally displays various display items, and an abnormality display monitor 33 that displays various abnormalities of the dryer are provided.

Next, a control block configuration will be described with reference to FIG.
A controller (CPU) 41 is provided in a control box 45 (shown in FIG. 1) provided above the burner wind tunnel 25. On the input side of the controller 41, there are a tension switch SW1, a drying switch SW2, a discharge switch SW3, a stop switch SW4, a grain type setting switch SW5, a moisture value setting switch SW6, a tension amount setting switch SW7, a timer increase switch SW8, A timer decrease switch SW9, an emergency stop switch SW20, and the like are connected. Further, load current values of the outside air temperature sensor SE1, the hot air temperature sensor SE2, the exhaust air temperature sensor SE3, the moisture meter electrode temperature sensor SE4, the moisture sensor SE5, the tension amount detection device SE6, and the elevator motor M3 are detected via the input circuit. The load current sensor SE7 to be connected is connected.

  The controller 41 is connected to the output side of a suction exhaust fan M1, elevator motor M2, feed valve motor M3, burner drive means M4, moisture meter drive means M5 via an output circuit, and via an output circuit. A display unit 32 for digital display of various display items, an abnormality display monitor 33 for displaying various abnormality of the dryer, and the like are connected.

  The burner drive signal of the controller 41 includes an ON / OFF signal and a large / small supply signal of an electromagnetic pump for fuel supply (not shown), a rotational speed command signal for a burner vaporizing cylinder motor (not shown), and a burner fan motor (not shown). , An igniter (not shown) energization signal, and the like, and the fuel supply amount, the combustion air supply amount, and the vaporization cylinder rotation number are controlled synchronously to vaporize and burn the liquid fuel.

  Further, during the drying operation, the hot-air set temperature preset and stored is compared with the hot-air temperature detected by the hot-air temperature sensor SE2, and the electromagnetic pump for fuel supply that is periodically turned on so that the difference becomes small The drying operation is performed while changing the on-time signal (not shown) to be longer or shorter, and the drying operation is stopped when the grain moisture reaches the target moisture value.

  Further, as shown in FIG. 6, the side wall of the storage chamber 2 indicates the magnitude of the amount of tension in the normal tension state in which the whole grain flow passages 9 and 9 of the drying chamber 3 are filled with the grain. The extension amount display of “LV1 to LV7” is made. The extension amount display “1-7” corresponds to the setting switch portion of “1-7” of the extension amount setting switch SW7. “LV0” indicates the minimum setting amount, corresponds to the indication amount “LV1”, and corresponds to a small amount in which the whole grain flow passages 9 and 9 are not filled with grains. What is set is the setting switch section “0” of the extension amount setting switch SW7.

  Further, when the diffusion device 18 is disposed at the upper center of the storage chamber 2, the diffusion device 18 is disposed slightly to the left of the central portion, and in the case of a small amount of filling, the entire left grain flow passages 9, 9 are filled with the grains. However, the right side grain flow passages 9, 9 are filled with the grain only in the lower part.

Next, the drying operation will be described with reference to FIG.
When the grain embedding operation into the storage chamber 2 is completed (step S1), the amount of the interstitial grain is set manually or by automatic detection by the embedding amount setting switch SW7. When the tension amount setting switch SW7 is set to “1” to “7”, the numerical value is manually set as the tension amount, and normal drying control is performed. That is, when the drying switch SW2 is turned on (step S9), the elevator 11, the upper transfer device 16 and the diffusing device 18 are started to be driven, the feeding valve 10 is driven, and the grain flow passages 9 and 9 are driven. The flowing grain is sprayed with hot air and fed to the cereal collection room 4 (step S4). Then, the grain fed to the bottom plate of the grain collection chamber 4 flows down while receiving the radiant heat of the far-infrared radiator 4 a heated by the combustion of the burner 5, and is supplied to the lower transfer device 14.

  Next, the grain is transferred to the elevator 11 by the lower transfer device 14 and is circulated and supplied to the storage chamber 2 and the drying chamber 3 again. During this circulation, a predetermined number of sample grains are taken into the moisture meter 26 every predetermined time from the grains being pulverized by the elevator 11 and the moisture value is measured.

  Then, the drying operation is performed while the combustion amount of the burner 5 is controlled based on the set drying rate and the amount of tension (step S10). When the measured moisture value of the moisture meter 26 reaches the set moisture value, the drying operation is performed. Stopped (step S11), so-called normal drying control is performed.

  Further, when the tension amount is set to 0 by the tension setting switch SW7 (step S2) and the drying SW is turned on (step S3), the burner 5 starts to burn and the circulation of the grain is also started. (Step S4). Then, it is determined whether or not the sample grain has been taken into the moisture meter 26 (step S5). If No, it is determined that there is no grain in the dryer, the burner 5 and the grain circulation are stopped, and the drying operation is performed. Is stopped (step S6).

  In the case of Yes, it is determined that the dryer has “grains”, and a small amount of drying is controlled. That is, when the drying SW is turned on, the fuel is burned in a state where it is constant at a small amount of combustion in which a fuel of a predetermined amount or less is supplied to the burner 5 (step S7). Next, drying is performed while “drying pause” and “hot air drying” are alternately repeated every predetermined time (for example, 1 hour) (step S8), and when the measured moisture value of the moisture meter 26 reaches the set moisture value, the drying operation is performed. Is stopped (step S11).

  Moreover, when the extension amount setting switch SW7 is set to “automatic”, the extension amount detection device SE6 automatically starts detecting the amount of the extension kernel after the end of the extension operation, and the amount of the extension kernel exceeds LV1. When detected, drying control based on the above-described normal drying control is performed (steps S9 to S11). And when the amount of squeezed grain is not detected below LV1 or the detection allowable range, the aforementioned small amount drying control is performed (S2).

  According to the said structure, combustion can be stabilized by making the combustion amount of the burner 5 constant. In addition, when the drying operation is performed with a small amount of filling less than the minimum amount of filling, the grains are not sufficiently accumulated in the grain flow passages 9 and 9, and the hot air chamber 6 moves to the grain flow passages 9 and 9. A part of the hot air that has flowed is discharged to the exhaust air chamber 8 without acting on the grain, and acts on the hot air temperature sensor SE2 disposed in the vicinity of the exhaust air chamber 8, and the detected temperature of the hot air temperature sensor SE2 And the correlation between the dried kernel temperature and the detection accuracy is lowered, and proper hot air temperature control cannot be performed. However, such inconvenience can be suppressed by making the combustion amount of the burner 5 small and constant.

  In addition, the amount of combustion of the burner in the drying step in the amount of small amount below the minimum grain amount is less than the predetermined amount (for example, 2 or less if the combustion amount is controlled in the range of 1 to 10). Alternatively, it is desirable that combustion is performed with a constant minimum combustion amount. That is, since the amount of grain embedding is small, by suppressing the combustion amount of the burner 5, it is possible to reduce problems such as cracking of the kernel due to rapid drying.

  For example, when a drying process for a set time of 1 hour is executed, the burner 5 and the feeding valve 10 are stopped, and the process proceeds to a drying suspension process. During this resting process, the moisture inside the grain is transferred to the surface side of the grain sequentially, and drying is promoted. In addition, since the kernel is not circulated during the drying suspension process, it is possible to prevent the circulation of a small amount of the kernel many times, and to suppress the deflation and damage of the kernel.

  Further, by stopping the suction exhaust fan 7 during the drying pause process, the temperature drop of the far-infrared radiator 4a is suppressed, the temperature drop of the grain during the drying pause process is suppressed, and the moisture transfer inside the grain is transferred. Can be promoted.

  Further, when the grain reaches the set moisture value and the drying operation is finished and the burner 5 is stopped, the suction exhaust fan 7 is set to a set time (for example, 20) after the burner 5 is stopped, unlike the drying pause process. Min) to drive the cooling of the far-infrared radiator 4a.

Next, an embodiment of the tension operation control will be described with reference to FIG.
When this control is started, the operator turns on the extension switch SW1 to start the extension operation (step S21). Next, the moisture meter 26 detects the presence or absence of grains in the elevator 11 (step S22), and then determines whether or not the moisture meter 26 has detected no grains (step S23). When the moisture meter 26 detects that there is no grain (step S24), the feeding valve 10 starts feeding (step S25), and the ventilation circulation operation in which the outside air is bathed on the falling grain is started (step S26). Next, it is determined whether or not the load of the elevator motor M2 has risen above the set value (step S27), and if it is Yes, it is determined that there is a new stretched grain (step S28), and the feeding valve 10 is stopped. Then, the process shifts to a process for stretching the squeezed grain (step S29), and the process returns to step S2.

  Further, it is determined whether or not the load of the elevator motor M2 has risen to a set value or more (step S27). If No, the stop condition of the ventilation circulation operation (for example, the moisture value and the grain temperature become below the reference value). ) Is satisfied (Step S30), and if No, the process returns to Step S27. If yes, the drive of the feeding valve 10 is stopped (step S31), then it is determined whether the moisture meter 26 has detected no grain after the set time (step S32), and if yes, the elevator 11 is stopped (Step S33), and if No, the process returns to Step S2.

  According to the above configuration, when stopping the circulation circulation operation while feeding out the grains in the tension mode, the drive of the elevator 11 is continued for a set time even after the feed valve 10 is stopped, and the moisture meter is set after the set time is over. Since the elevator 11 is stopped after 26 detects the absence of grain, the elevator 11 can be stopped in a state where there is no grain remaining, and when the tensioning operation is resumed, the elevator 11 is prevented from being clogged. Work can be resumed smoothly.

  Further, in determining whether or not the load of the elevator motor M2 has risen to the set value or more, the driving cycle of the feeding valve 10 is “forward rotation time + stop time + reverse rotation time + total time of stop time”, or If the load current value is detected in half of the time and it is determined whether or not it is equal to or greater than the set value, detection of the detected load current value is stabilized, and the accuracy of overload determination can be improved.

  Moreover, after detecting that the load current value of the elevator motor M2 has risen to the set value or more and shifting to the ventilation circulation while feeding out the grain, the load current value is immediately detected, and based on this detected value Calculate the load increase rate. And when exceeding a reference | standard increase rate, you may comprise so that the drive of the delivery valve | bulb 10 may be stopped and it may return to the tension operation of the tension input grain. If comprised in this way, since the overload determination is performed while grasping the fluctuation of the detected load current value, the accuracy of the overload determination can be improved.

Next, the discharge control of the dryer will be described with reference to FIG.
When drying high-moisture wheat with a grain dryer, a part of the dryer becomes poorly flowing, and the circulating part finishes drying to the set moisture value and discharges, and finally the poorly flowing down The part of the drying delay is discharged, and the problem of unevenness of moisture may be found. This discharge control is intended to cope with such problems.

  When the main discharge control is started, the discharge operation starts when the operator turns on the discharge switch SW3 (step S41), and the detection of unevenness in the moisture of the whole dried kernel is started while discharging the kernel. An average moisture value of the block is calculated (step S42). Next, it is determined whether or not the difference in moisture unevenness of each stretched grain block is greater than or equal to a predetermined value (step S43). If No, the discharge is started, and when the discharge is finished (step S44), the dryer is turned on. Stop automatically.

  Further, it is determined whether or not the difference in the average moisture value of each grain block is greater than or equal to a predetermined value (step S43), and if yes, a failure indication “large moisture unevenness” is displayed on the display unit 32 (step S46). ), Stop the dryer without discharging the grain. Based on this failure display, the operator performs additional drying of the grains to eliminate the unevenness of moisture (step S47).

  According to the above configuration, the good part of the circulating state in the dryer is discharged at the set moisture value, but when the part of the poorly flowing part is started, the high moisture value is detected from the detected moisture value. Unevenness of moisture is recognized, discharge is stopped, and problems due to moisture unevenness are displayed. Accordingly, the operator only needs to follow and dry only the portion with a high moisture value remaining in the dryer, and the unevenness in moisture can be eliminated while reducing the additional drying time.

Next, the drying operation control will be described with reference to FIG.
As a method of using the grain dryer, the grain harvested by the combine by evening is put in the grain dryer and dried at night. When the unevenness of moisture is eliminated, there is a series of work patterns in which the hulling work is started by the hulling sorter. The present drying control is intended to automate such a work pattern and smoothly finish the grain drying work.

  A finish confirmation switch (not shown) is provided, and when this switch is pressed, a dry finishing operation is started. As shown in FIG. 9, when the finish confirmation switch is pressed (step S51), the suction / exhaust fan motor M1 and the feed valve motor M3 are turned on, and the ventilation circulation operation is executed until the amount of the squeezed grain is circulated (step). S52). During this time, while cooling the grain temperature, the moisture unevenness, the average moisture value, the deviation value of the moisture irregularity, and the grain temperature are measured every predetermined time for the entire in-machine grain (step S53). Next, it is determined whether or not the moisture unevenness, the average moisture value, and the grain temperature exceed the specified value (step S54), and in the case of No, the measurement results such as moisture unevenness are displayed in a graph on the display unit 32, The determination of the drying result is displayed as “good drying”, and the operation is stopped (step S55).

  In addition, it is determined whether or not the moisture unevenness, the average moisture value, and the grain temperature exceed the specified values (step S54), and in the case of Yes, additional drying such as ventilation circulation drying and uneven moisture depending on the condition of the drying failure The elimination operation is executed (step S56), the display unit 32 displays the estimated time of convergence of the moisture unevenness, and the operation is stopped (step S57).

According to the said structure, confirmation of a dry finishing state can be automated and the hulling operation | work of the next process can be performed rapidly.
Next, another embodiment of the drying operation control will be described.

This control is intended to perform automatic operation in all steps of the tension operation, the ventilation circulation drying operation, the hot air circulation drying operation and the discharge operation in the drying operation.
In the tensioning process, the tensioning work is started when the tensioning switch SW1 is turned on. When the grain is not tensioned, the process is automatically switched to the ventilation circulation mode, and the circulation circulation drying is performed while feeding the tensioned grain. Prevents stuffiness. Further, when the load current sensor SE7 detects the insertion of the squeezed grain again, the process shifts to the normal squeezing mode in which the feeding valve 10 is stopped, and the stalk is squeezed.

  When the drying switch SW2 is turned on, the process proceeds to the drying process, setting conditions such as hot air temperature and grain temperature are set based on the standard conditions, the standard drying operation is executed, and when the final moisture value is reached, the drying operation is performed. Finish and move to the discharge process. In the discharging process, if there is a defect in the finished moisture value, discharging is stopped at that time, and if it is not dried, the remaining grain is automatically re-dried by the standard drying operation of the drying process. Next, if there is stored data (for example, finished moisture value), the display of the finished moisture value is corrected based on the saved moisture value data, and the operation is stopped.

According to the said structure, the automatic driving | operation in all the processes of drying work is attained, and an operator can perform drying work easily.
Next, the drying control of the grain dryer provided with the far-infrared radiator 4a will be described.

  As shown in FIGS. 1 and 2, in the grain dryer in which the far-infrared radiator 4a is disposed in the central exhaust chamber 8, the far-infrared radiator 4a is heated after the burner is ignited. It takes about 30 minutes. When normal grain with high moisture content starts drying, it does not matter so much, but when the initial moisture value is low or when additional drying is performed, if the hot air temperature rises rapidly after the burner is ignited, it is dried in this part The grain becomes overdried, and the problem that the whole water unevenness expands may occur.

  This drying control is intended to cope with such problems, and calculates the heating temperature at the start of combustion from the outside air temperature at the start of drying and the hot air set temperature, and sets the standard combustion amount based on the heating temperature. The fuel pump discharge amount is calculated and combustion is started. Then, when the discharge amount of the fuel pump reaches the calculated heating temperature, the discharge amount of the fuel pump is fixed for a predetermined time (for example, about 5 to 10 minutes), and the temperature of the far-infrared radiator 4a is stabilized, and then the hot air temperature Transition to control.

  For example, if the outside air temperature is 20 degrees C and the hot air set temperature is 50 degrees C, the heating temperature is 30 degrees C. If heating of 30 degrees C requires 3.9 liters / hour of fuel and the on-time control value of the fuel pump at this time is 13 mSec, the on-time control value of the fuel pump will be 13 mSec from the start of drying. At the time of arrival, for example, the fuel discharge amount is fixed for about 10 minutes, and then the hot air temperature control is performed so that the detected hot air temperature becomes the set hot air temperature. According to the above configuration, since the temperature of the far-infrared radiator 4a is stabilized and then the discharge amount of the fuel pump is controlled to enter the hot air temperature control, the hot air temperature can be prevented from rising rapidly and the hot air temperature can be controlled stably. it can. Therefore, partial overdrying of the grain can be prevented, and problems such as expansion of moisture unevenness can be prevented.

The cut side view of a grain dryer. The cutting front view of a grain dryer. The front view of an operation panel. Control block diagram. flowchart. The cutting front view of the grain dryer which shows a small amount tension state. flowchart. flowchart. flowchart.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Grain dryer 2 Storage room 3 Drying room 4 Grain collection room 5 Burner 6 Hot air room 7 Suction exhaust fan 8 Ventilation room 9 Grain flow down passage 10 Feeding means 11 Elevator 26 Moisture meter 41 Controller SE7 Presence or absence of stretched grain Detection means (load current sensor)

Claims (1)

Grain to be dried by sending dry hot air generated by mixing the combustion heat of the burner (5) and the outside air to the drying chamber (3) while circulating the grain from the upper storage chamber (2) to the lower drying chamber (3). In the grain dryer,
Feeding means (10) for feeding the grain of the drying chamber (3) to the lower gathering room (4), and the grain fed to the gathering room (4) or the loaded grain input port. Elevator (11) for cerealing the squeezed kernel into the storage chamber (2), and moisture for detecting the sample moisture content or the presence or absence of the incorporated cereal by taking in the sample grain from the cereal grain of the elevator (11) A total (26) and an input overhanging grain presence / absence detection means (SE7) for detecting the presence or absence of the overhanging grain are provided, and the drying hot air generated by the combustion heat of the outside air and the burner (5) is supplied to the drying chamber (3 ) And a ventilating circulation process for supplying only the outside air to the drying chamber (3), and the above-mentioned inserted squeezed grain presence / absence detecting means during squeezing the grain in the squeezing mode When (SE7) detects no overhanging input grain, the driving means (10) is driven. When the process moves to the wind circulation process and the input overhanging grain presence / absence detection means (SE7) detects the presence of the overhanging input grain during the ventilation circulation of the overhanging grain, the aeration circulation process and the feeding means (10) are performed. When the stopped tension mode operation is started and the ventilation circulation process is stopped, the feeding means (10) is first stopped. Then, when the moisture meter (26) does not take in the sample grain, the elevator (11 ) Is provided with a controller (41) that stops the operation.

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