JP2001255064A - Crop drying device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a crop drying device having a first technical issue that a temperature increasing range until an irregular temperature of heating air is detected does not produce such difference in its value as in conventional devices even if the temperature of the heating air is increased, as an emergency of reducing an amount of air in the crop drying device occurs in reference to a difference in an ambient temperature; and then having a second technical issue that the crops can be dried by reducing the number of stopping an operation of a burner to a value less than that of the prior art even under the irregular state. SOLUTION: A control means 22 applies, as a surrounding air temperature, a dried air temperature detected by a drying air temperature sensing means 21 before starting operation of a heating air generating means 14; performs a repetitive comparison between an upper limit temperature having a predetermined irregular reference temperature added to the ambient temperature and the heating air temperature detected by a heating air temperature sensing means 44; instructs the heating air generating means 14 to stop its operation when the heating air temperature exceeds the upper limit temperature or when the heating air temperature is coincident with the upper limit temperature; and subsequently instructs the heating air generating means 14 to perform a re-operation so as to generate heating air of lower temperature than that of stopping operation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cereal drying apparatus for drying cereals, for example, rice (fir) and barley, and more particularly to a cereal drying apparatus in which a blast air is blown onto a cereal to dry the cereal before drying. The present invention relates to a grain drying device provided with a mechanism for raising the grain.

[0002]

2. Description of the Related Art Conventionally, a grain drying apparatus provided with a mechanism for raising the grain temperature by heating before blowing dry air to the grain has been disclosed in Japanese Patent Application No. 11-210, filed by the present applicant.
No. 2,376,43 and Japanese Patent Application No. 10-265486.

FIG. 16 is a front view of a cross section of a part of a conventional grain drying apparatus 100, in which a storage tank 101 for storing grains at an upper portion of a body 100a, a heating section 102 for heating grains at an intermediate portion, and The drying unit 103 is provided at the lower part to blow the drying air to dry the grains. The heating unit 1
02 is a ventilation tube 1 through which heated air is passed
04 are arranged in a zigzag pattern. FIG. 17 is a side view in which a part of the conventional grain drying device 100 is sectioned. A burner device 105 for generating heated air is provided on one side of the machine body 100a. Is controlled by the control device 109. The burner device 105 is connected to one side of each of the ventilation pipes 104 by a front air passage 106. The other side of the body 100a is connected to the
03 is connected. An exhaust fan 108 is connected to the drying unit 103. In addition, an outside air temperature sensor 110 for detecting an outside air temperature is provided. The grain drying apparatus 100 having the above-described configuration is configured to control the drying apparatus 10 according to the amount of grain supplied to the grain drying apparatus and the outside air temperature.
The temperature of the drying air to be supplied to 3 is set, and the burner device 105 is started to operate with a combustion amount corresponding to the setting temperature of the drying air. The heated air heated by the burner device 105 is sucked by the exhaust fan 108 so that the front air passage 1
After entering each ventilation pipe 104 through 06 and heating each ventilation pipe 104, the air is exhausted from the exhaust fan 108 via the rear air path 107 and the drying unit 103. And the heating unit 1
At 02, the cereals are heated by directly contacting each ventilation pipe 104 heated by the heated air, and the heated cereals are dried by the drying unit 103 by the drying air.

[0004] In the above-mentioned grain drying apparatus, if an emergency occurs in which the amount of air in the grain drying apparatus decreases due to an abnormality of the exhaust fan 108 or a change in exhaust resistance, the exhaust air is discharged. As the amount of exhaust air from the fan 108 decreases and the temperature of the heated air passing through each ventilation pipe 104 rises, the temperature of the ventilation pipe 104 rises to an abnormal temperature that may adversely affect the quality of the grain. Sometimes. Therefore, the control device 1 provided in the grain drying device
09 indicates the temperature of the ventilation pipe 104, that is, the temperature of the heated air supplied into each ventilation pipe 104.
A predetermined abnormal set temperature (for example, 180
(° C.), the control to stop the burner for a certain period of time is performed to lower the temperature of the ventilation tube 104. After that, the drying air set temperature is lowered by a predetermined amount, and the burner is restarted. A technique for stopping the burner when an abnormal temperature of the hot air in the drying device is detected is disclosed in Japanese Patent Publication No. Hei 6-27634.

[0005]

However, the setting temperature of the drying air supplied to the drying section 103 is set by the control device 109 so as to increase as the outside air temperature increases in terms of drying efficiency. Therefore, the ventilation pipe 1
The temperature of the heated air supplied to the tank 04 also increases as the outside air temperature increases. Therefore, when the outside air temperature is low,
Since the heating air temperature decreases, the difference between the heating air temperature and the abnormal set temperature (for example, 180 ° C.) increases. At this time, as described above, in the event that the heating air temperature rises due to an emergency where the air volume in the grain drying device decreases, if the outside air temperature is low, the heating air temperature and the abnormal set temperature Because the difference is large, the heating air temperature is not detected as an abnormal temperature until the heating air temperature reaches the abnormal set temperature. Therefore, in an emergency, the lower the outside air temperature is, the larger the temperature rise of the ventilation pipe 104 becomes. As described above, the temperature rise width until the abnormal temperature of the heated air temperature is detected has a difference in magnitude depending on the difference in the outside air temperature. Therefore, the temperature rise width of the ventilation pipe 104 until the abnormal temperature is detected varies depending on the difference in the outside air temperature, and the temperature of the grain heated by the ventilation pipe 104 also varies.

When an abnormal temperature is detected, the burner device is stopped for a certain period of time as described above, and then the set temperature of the drying air is reduced by a predetermined amount to restart the burner device. If the outside air temperature rises by the temperature of the set drying air temperature of the burner device or more than this, the temperature of the heated air also rises by the temperature rise of the change in the outside air temperature. Therefore, the temperature of the heated air is detected again as an abnormal temperature, and the burner is stopped again for a certain period of time, so that the grain is not dried during this time.

[0007] In view of the above problem, the present invention detects an abnormal temperature of the heated air temperature even when the temperature of the heated air rises in an emergency where the air volume in the grain drying device is reduced. The first technical problem is to prevent the temperature increase width from increasing or decreasing due to a difference in outside air temperature as in the related art. A second object of the present invention is to provide a grain drying apparatus in which grain drying can be performed with a smaller amount.

[0008]

According to the first aspect of the present invention, there is provided a storage unit for storing grains, and a ventilation pipe heated by heated air heated by heated air generating means. A heating unit that directly raises the grain temperature by directly contacting the grain, and a drying unit that sends the heated air that has passed through the ventilation pipe of the heating unit to the grain as drying air to dry the grain,
Discharging means for sequentially discharging the grains out of the drying device; recirculating means for returning the grains discharged from the discharging means to the storage unit; and exhaust air for discharging the drying air from the drying unit to the outside of the drying device. Means, in a grain drying apparatus comprising: a heated air temperature detecting means for detecting a heated air temperature heated by the heated air generating means, and a dried air temperature detecting means for detecting a dried air temperature in the drying unit, The drying air temperature detected by the drying air temperature detecting means before the operation of the heating air generating means is set as the outside air temperature, and the upper limit temperature obtained by adding a predetermined abnormal reference temperature to the outside air temperature is detected by the heating air temperature detecting means. When the heating air temperature exceeds the upper limit temperature by repeatedly comparing with the heating air temperature or when the heating air temperature coincides with the upper limit temperature, the heating air generation unit is instructed to stop, and thereafter, a lower temperature than before the stop. Heating And control means for commanding re-activation to heated air stream generating means to generate, took technical means that comprises a.

More specifically, the abnormal reference temperature is, for example, 150 ° C. regardless of a change in the outside air temperature. And
The case where the outside air temperature is, for example, 5 ° C. and 20 ° C. will be described. When the outside air temperature is 5 ° C., the upper limit temperature is 155 ° C., and the heated air temperature is, for example, 145 ° C. On the other hand, when the outside air temperature is 20 ° C., the upper limit temperature is 170 ° C., and the heated air temperature is 160 ° C., which is 15 ° C. higher than the difference between the outside air temperatures. At this time, the temperature difference between the heated air temperature and the upper limit temperature is that the outside air temperature is 5
Even when the temperature differs between 20 ° C. and 20 ° C., the temperature is 10 ° C. in both cases.
Therefore, since the temperature rise width until the abnormal temperature of the heated air temperature is detected does not change in size due to the difference in the outside air temperature as in the related art, the temperature of the grain heated by the ventilation pipe 12 varies. There is no.

In a preferred embodiment of the present invention, the control means is configured to control the heating air temperature and / or the heating air temperature when the heating air temperature exceeds an upper limit temperature.
Alternatively, the heated air generating means is stopped for a predetermined time so that the dry air temperature approaches the outside air temperature, and the dry air temperature detected by the dry air temperature detecting means when the predetermined time has elapsed is set as a new outside air temperature. Taking technical measures.
Therefore, when the heating air temperature exceeds the upper limit temperature, the control means stops the heating air generation means for a predetermined period of time so that the heating air temperature and / or the drying air temperature approaches the outside air temperature. Dry air is sent. As a result, the grain temperature is reduced, so that it is possible to prevent quality deterioration due to the continuation of the overheated state of the grain. Further, since the outside air temperature at the time of restarting the heating air generating means can be grasped by the drying air temperature detecting means, the upper limit temperature at the time of restarting can be set again. As a result, the abnormal reference temperature is set to, for example, 150, regardless of a change in the outside air temperature.
° C, and when the abnormal temperature of the heated air is detected, that is, when the outside air temperature when the burner device 14 is stopped is set to, for example, 20 ° C, the upper limit temperature J is 170 ° C. Then, it is assumed that the outside air temperature when the burner device 14 is stopped and restarted for a predetermined time has risen to, for example, 23 ° C. Further, when the burner device 14 is restarted, the drying air temperature is set to 1 ° C.
Suppose that it was lowered. In this case, the burner device 14 does not stop. The reason will be described. The temperature of the heated air at the time of the reactivation is increased by 2 ° C., which is a difference of 3 ° C. of the outside air temperature and 1 ° C. of the dry air temperature, and becomes 172 ° C. On the other hand, the upper limit temperature J at the time of the restart is the outside air temperature (23
℃) + abnormal reference temperature (150 ℃). The heating air temperature (172 ° C) at the time of restarting is the upper limit temperature (173
° C), so that it is not determined as an abnormal temperature. Therefore, when the burner device 14 is stopped for a certain period of time and restarted, even if the outside air temperature rises by a decrease of the drying air temperature (predetermined temperature) or more, the drying of the grain is continued without stopping the burner device 14. Will be.

Further, according to claim 3, when the heating air temperature exceeds the upper limit temperature, the control means stops the heating air generating means until the drying air temperature detected by the drying air temperature detecting means does not decrease. Then, when the predetermined time has elapsed, the dry air temperature detected by the dry air temperature detecting means is set as a new outside air temperature. Therefore, since the temperature of the drying air is reduced to the outside air temperature and the temperature of the grain is also reduced, it is possible to prevent the quality from being deteriorated due to the continued overheating of the grain. Further, since the outside air temperature at the time of restarting the heating air generating means can be grasped by the drying air temperature detecting means, the upper limit temperature at the time of restarting can be set again.

According to a fourth aspect of the present invention, when the heating air temperature exceeds the upper limit temperature, the control means stops the heating air generating means until the heating air temperature detected by the heating air temperature detecting means does not decrease. Then, when the predetermined time has elapsed, the dry air temperature detected by the dry air temperature detecting means is set as a new outside air temperature. Therefore, since the temperature of the heated air is reduced to the outside air temperature and the temperature of the grain is also reduced, it is possible to prevent quality deterioration due to the continuation of the overheated state of the grain. Further, since the outside air temperature at the time of restarting the heating air generating means can be grasped by the heating air temperature detecting means, the upper limit temperature at the time of restarting can be set again.

According to the fifth aspect, the grain temperature is raised in advance by bringing the grain into direct contact with the storage section for storing the grain and the heated ventilation pipe introduced into the inside by the heated air heated by the heated air generating means. A heating unit to be heated, a drying unit that blows the heated air that has passed through the ventilation pipe of the heating unit to the cereal as drying air to dry the cereal, and a discharge unit that discharges the cereal to the outside of the drying device. Recirculation means for returning the grains discharged from the means to the storage section, and exhaust means for exhausting the drying air from the drying section to the outside of the drying apparatus; A heated air temperature detecting means for detecting the heated heated air temperature, an outside air temperature detecting means for detecting an outside air temperature outside the drying device, and a predetermined abnormal reference temperature for the outside air temperature detected by the outside air temperature detecting means. The maximum temperature When the heating air temperature exceeds the upper limit temperature by repeatedly comparing the heating air temperature detected by the air temperature detecting means or when the heating air temperature matches the upper limit temperature, the heating air generating means is instructed to stop. Then, there is provided a control means for instructing the heating air generation means to restart the heating air generation means so as to generate a heating air having a lower temperature than before the stop.

According to the first aspect of the present invention, the outside air temperature is detected by the dry air temperature detected by the dry air temperature detecting means before the operation of the heated air generating means.
In the present invention, since the outside air temperature detecting means for detecting the outside air temperature is provided, the outside air temperature can be detected at any time by the outside air temperature detecting means. The functions and effects of the fifth aspect are the same as those of the first aspect.

According to a sixth aspect of the present invention, there is provided a drying air temperature detecting means for detecting the temperature of the drying air in the drying section, wherein the control means detects the temperature of the drying air and the temperature of the drying air when the heating air temperature exceeds an upper limit temperature. Technical measures are taken to instruct the heated air generating means to stop until the temperature detected by the temperature detecting means coincides. Therefore, since the heating air generating means is restarted after the temperature of the cereal is lowered by lowering the temperature of the drying air to the outside air temperature, it is possible to prevent the quality from being deteriorated due to the continuation of the overheated state of the cereal.

According to the seventh aspect, the control means is provided by the outside air temperature detecting means when the detected temperature of the outside air temperature detecting means coincides with the detected temperature of the dry air temperature detecting means after the stop of the heated air generating means. Technical measures were taken to make the detected temperature the new outside air temperature. Therefore, the upper limit temperature at the time of restarting the heating air generating means is reset based on the outside air temperature at the time of restarting the heating air generating means. Even if the temperature rises above the outside air temperature at the time of stoppage by a decrease of the dry air temperature (predetermined temperature) or more, the heated air generation means does not stop again due to this increase. The heating air generating means stops when the heating air temperature exceeds the reset upper limit temperature, and the drying operation is performed until the stop.

According to the eighth aspect, the control means takes technical means that the discharge means, the recirculation means and the discharge means are continuously operated while the heating air generation means is stopped. Was. Therefore, the grains in the drying apparatus circulate in the apparatus, so that the grains do not remain in direct contact with the abnormally heated ventilation pipe, and the temperature of the grains is reduced by the drying wind that decreases to the outside air temperature. Quality can be prevented from being maintained due to the continuation of the product.

[0018]

FIG. 1 shows a preferred embodiment of the present invention.
This will be described with reference to FIG. Grain drying apparatus 1 indicated by reference numeral 1
Is a storage tank 2 for storing grain from the top, and an air duct 3
And a plurality of perforated plates 6 arranged between a front side A and a rear side B, and a grain distribution lower tank 5 connected to the exhaust path 4 and the storage section.
And a screw conveyor 9 for intermittently discharging the grains through a slanted non-perforated plate 5b connected to the grain distribution lower tank 5a of the drying section 7 and a screw conveyor 9 for horizontally transporting the discharged grains. Take-out part (discharge means) consisting of
10 are sequentially superposed. Further, the take-out unit 10 and the storage tank 2 are connected via a recirculation means including a bucket conveyor 11 and a screw conveyor 43,
The cereal passes through the drying unit 7 from the storage tank 2 and the take-out unit 10 from the drying unit 7 and is again fed into the storage tank 2 by the reflux means 11 and 43 to repeat the circulation.

Further, the storage tank 2 is provided with a heating unit 13 formed by extending a plurality of ventilation pipes 12 in the front-rear direction below the storage tank 2. On the front side A of the drying unit 7 of the grain drying device 1, a burner device (heating air generating means) 14 for burning kerosene as fuel is provided, and the heat generated by the burner device 14 is directly heated by a plurality of ventilation air as heating air. A heat path is connected via a front air path 15 so as to be introduced into the ventilation pipe 12 from the front side A of the pipe 12. A heating air temperature sensor (heating air temperature detecting means) 44 for measuring the temperature of the heating air is provided near the front side A of the ventilation pipe 12 in the front air passage 15 and a control device (control means).
It is connected to the burner device 14 via 22. The rear side B of the ventilation pipe 12 is connected to the air passage 3 of the drying unit 7 through the rear air passage 16.
Connected to An outside air inlet 17 is provided in the rear air passage 16. Further, an exhaust fan (exhaust means) 20 is provided on the rear side B of the grain drying apparatus 1, and the exhaust fan 20 is connected to the exhaust path 4 and the exhaust path. Drying section 7 of rear air passage 16
A drying air temperature sensor (dry air temperature detecting means) 21 for measuring the drying air temperature is provided in the vicinity, and is connected to the burner device 14 via a control device 22.

The control device 22 in the control block diagram shown in FIG.
Then, the drying air introduced into the drying unit 7 is heated to a predetermined temperature (4
(About 0 ° C.). To the I / O port 22a of the control unit 22,
A signal from the input unit 29 having an operation switch, a signal from the heated air temperature sensor 44 via the A / D conversion circuit 45, and A
A signal from the dry air temperature sensor 21 via the / D conversion circuit 23 and a signal from the moisture detector 18 via the A / D conversion circuit 24 are input.
The motor drive circuit 25 outputs signals to the take-out unit 10 and the drive motor 25c of the bucket conveyor 11.
And to start and stop the drive motor 25a of the exhaust fan 20. The control device 22 mainly includes a CPU 22b for performing a comparison operation process, and is connected to the I
/ O port 22a, a read-only memory (hereinafter referred to as "ROM") 22c in which set values such as a control program, temperature / moisture, and an abnormal reference temperature described later are stored, and a stuck amount input from an input unit and a selected A read / write memory (hereinafter referred to as “RAM”) 22 d for storing values and calculation results is provided. The CPU 22b is an input unit 29
In addition to monitoring the signals of the drying air temperature sensor 21 and the moisture detecting device 18, a signal from the input unit 29 is output to each unit to operate.

The input unit 29 includes a setting switch 29a for setting the amount of setting, a moisture setting switch 29b for setting the finished moisture, a setting button 29c for starting setting, a drying button 29d for starting drying, and a discharging function for discharging grains. Button 29e and the like are provided. When receiving the signal indicating that the push-in button 29c has been pressed from the input unit 29, the control device 22 outputs a signal to the motor drive circuit 25 to drive the take-out unit motor 25b, the bucket conveyor motor 25c, and the fan motor 25a. Further, when receiving a signal indicating that the discharge button 29d has been pressed from the input unit 29, the control device 22 outputs a signal to the motor drive circuit 25 to drive the bucket conveyor motor 25c, the take-out unit motor 25b, and the fan motor 25a. In addition,
The screw conveyor 43 is driven by the power of a bucket conveyor motor 25c.

The flow of the heating air and the drying air in the above configuration will be described with reference to FIGS. The operation of the burner device 14 and the suction of the exhaust fan 20 cause the burner device 14 to operate.
The heating air generated by the heating becomes, for example, about 100 ° C. and is directly introduced into the ventilation pipe 12 of the heating unit 13, and the ventilation pipe 12 is heated by the heating air. The heated air that has passed through the heating unit 13 is introduced into the rear air passage 16, mixed with the outside air taken in from the outside air inlet 17 by suction of the exhaust fan 20, and
It becomes a dry wind of the degree. The drying air is introduced from the rear air passage 16 to the air passage 3, and when the air is blown from the air passage 3 to the exhaust air passage 4, the drying air deprives the grain flowing down the grain distribution lower tank 5 of water and passes through the exhaust air passage 4. The air is exhausted outside the apparatus 1 by the exhaust fan 20.

The grain is heated by directly contacting the ventilation pipe 12 in the heating unit 13 while flowing down from the storage tank 2 to the drying unit 7 by the operation of the take-out unit 10. The heated grain is discharged from the drying unit 7 by operating the valve 8 of the take-out unit 10 while being exposed to the drying air while flowing down the grain distribution lower tank 5 of the drying unit 7 and depriving of moisture. The discharged grain is laterally conveyed by the screw conveyor 9 and is charged into the storage tank 2 by the bucket conveyor 11 and the screw conveyor 43. In this way, the grain is stored in storage tank 2,
It circulates through the heating unit 13, the drying unit 7, and the take-out unit 10.

Further, as described above, since the outside air is introduced from the outside air inlet 17, the hot air generated by the burner device 14 can be heated to a high temperature of about 100 ° C. That is, since the temperature of the ventilation pipe 12 of the heating unit 13 can be made sufficiently high, not only can the grain temperature of the grains that come into contact with the ventilation pipe 12 during flowing down be appropriately increased, but also this high-temperature heated air Then, since the air is mixed with the outside air, even if the heated air is at a high temperature, it can be sufficiently utilized as a low-temperature dry air suitable for the dry air. That is, the heating unit 13 can be heated to a sufficiently high temperature without considering the temperature of the drying air.

Here, focusing on the temperature of the grain, the moisture in the grain preheated by the heating is such that the grain temperature between the central portion and the grain surface becomes uniform, so that the distortion between the central portion and the grain surface is reduced. Since the water does not occur, the moisture is easily and safely removed by being exposed to the drying air in the drying unit 7 without any trouble such as a crack in the body. The temperature of the drying air in the drying unit 7 is decreased as the grain moisture decreases, and the control range is, for example, 40 ° C. to 30 ° C.

Next, control of the grain drying apparatus 1 will be described. In the drying, the amount of sticking into the storage tank 2 is set by the sticking setting switch 29a, and the finished moisture value is set by the moisture setting switch 29b. The set value is stored in the RAM 22d, and the drying start switch 29d is further set. Input. When the controller 22 receives the drying signal in this way, the control program stored in the ROM is executed.

The control program will be described with reference to the flowchart shown in FIG. First, a signal is output (5-1) to the motor drive circuit 25 to drive the take-out section motor 25b, the bucket conveyor motor 25c, and the fan motor 25a. Next, the temperature of the drying air that has not been heated is detected by the drying air temperature sensor 21 and stored in the RAM 22d of the control device 22 as the outside air temperature K1 (5).
-2). The value of the outside air temperature K1 stored in the RAM 22d is stored in the RAM 22d again as a value H. Thereafter, the control device 22 outputs a burner start signal to the drive circuit 26 of the burner device 14 (5-3). At the start of drying, the amount N of the storage tank 2 is stored in the RAM of the control device 22.
22d is stored (5-4). This sticking amount N
Is set in advance in the ROM 22c, and a predetermined temperature corresponding to the sticking amount N is selected and stored in the RAM 22d. That is, when the sticking amount N is 2000 kg or more (5-5), the outside air temperature K1 is compared with the outside air temperature K1.
1 + 55 ° C. is stored as the predetermined temperature, and when the sticking amount N is less than 2000 kg and 1500 kg or more (5-6)
Stores the outside temperature K1 + 40 ° C. as a predetermined temperature,
Similarly, when the weight is less than 1500 kg and 1000 kg or more (5
-7) stores the outside air temperature K1 + 30 ° C. as the predetermined temperature. If it is less than 1000 kg (but not less than the minimum sticking amount) (5-8), the external temperature K1 + 20 ° C. is stored as the predetermined temperature. Here, an example of the case (A) when the outside air temperature K1 + 20 ° C. is set as the initial predetermined temperature is shown. For the other (B) to (D), for example, a temperature as shown in Table 1 below is added to the outside air temperature K1, and this temperature is used as the predetermined temperature T0.

[Table 1] Determine the hot air temperature to the initial predetermined temperature and start drying,
The predetermined temperature is reduced in accordance with the grain moisture value that decreases as the drying of the grain progresses. That is, while detecting the grain moisture during drying, the moisture value and the temperature are set in advance so that the predetermined temperature is reduced according to the moisture value, and R
It is stored in the OM 22c. Therefore, what is selected according to the sticking amount N is a predetermined temperature (outside air temperature K1 + 20 ° C.)
And the first to third moisture values for switching the predetermined temperature shown in step (5-9), and the predetermined temperature to be switched corresponding to the moisture value shown in FIG. And these are read from the ROM 22c and R
Stored in the AM 22d.

As described above, when the drying is started, the amount N
When the predetermined temperature is set in accordance with the control, the control shown in FIG. 6 is performed in accordance with the set predetermined temperature. First, RAM 22d
Is reset to 0. The signal of the moisture detector 18 obtained through the I / O port 22a is
For example, it is periodically detected at intervals of 10 minutes (6-1), the grain moisture value M is compared with 21% of the first moisture (6-2),
If the grain moisture is 21% or more, the RAM 2 of the control device 22
The predetermined temperature T0 stored in 2d is the outside temperature K1 + 20.
It remains at ゜ C. In addition, the grain moisture M is less than 21%, 1
If it is 7% or more, (6-3) RAM 22 of control device 22
The predetermined temperature T0 stored in d is the outside air temperature K1 + 7 ° C.
Is changed to Further, if the grain moisture M is less than 17% or more than 15% (6-4), the predetermined temperature T0 stored in the RAM 22d of the control device 22 is changed to the outside air temperature K1 + 5 ° C.

When it is determined in step (6-4) that the difference is less than 15%, 1 is stored (6-5) in the counter C set in the RAM 22d before the moisture detection (6-1). Thus, every time the grain moisture changes, the control device 22
Is changed, the drying proceeds with the optimum drying air temperature for the grain according to the grain moisture. Fifteen
% Is detected three times (6-6), it is determined that the drying is completed, and the control device 22 sends the burner device 14
Burner STOP signal is output to the drive circuit 26 (6-7)
A signal is output (6-8) to the motor drive circuit 25 to stop the take-out motor 25b after an arbitrary delay time, and the bucket conveyor motor 25c and the fan motor 25a are further stopped after a further delay time. After the output of the signal to the motor drive circuit 25 (6-8), the execution of the control program ends.

Until the water content is detected to be less than 15% three times in step (6-6), the control of FIG. 7, that is, the control of the burner device 14 based on the dry air temperature detected by the dry air temperature sensor 21 is continued. explain. As described above, the predetermined temperature T0 stored in the RAM 22d is used as a reference (7-
As 1), the dry air temperature T is compared with the dry air temperature T detected by the dry air temperature sensor 21 (7-2).
If higher, the control device 22 sends the burner device 14
A signal for reducing the fuel supply amount is output (7-3).
When the drying air temperature T is lower than the predetermined temperature T0,
A signal for increasing the fuel supply amount is output from the control device 22 to the burner device 14 (7-4). If the drying air temperature T matches the predetermined temperature T0, no signal is output (7-
5) The detection of the drying air temperature T is repeatedly performed.

Subsequently, the control shown in FIG. 8, which is a characteristic control of the present invention, is executed. That is, the control of the burner device 14 when the abnormal temperature rise of the heated air is detected (hereinafter, referred to as “control of the burner device at the time of the abnormal temperature of the heated air”). First, the count N provided in the RAM 22d
Is reset to 0 (zero). Next, the value H stored in the RAM 22d is entered into the outside air temperature K1 and stored in the RAM 22d. The outside air temperature K1 and the abnormal reference temperature stored in the RAM 22d are read out, the abnormal reference temperature is added to the outside air temperature K1, and this value is stored in the RAM 22d as the upper limit temperature J (8-1). The heated air temperature W detected by the heated air temperature sensor 44 is stored in the RAM 22d (8-
2) Do it. Next, the upper limit temperature J and the heated air temperature W are read and compared (8-3). As a result of this comparison, if the value of the heating air temperature W is smaller than the value of the upper limit temperature J, the heating air temperature is determined to be normal, and the process returns to the moisture value detection in step (6-1) shown in FIG. The value of the heated air temperature W is the upper limit temperature J
If the values do not match, the process may return to the moisture value detection in step (6-1). On the other hand, if the value of the heating air temperature W is larger than the value of the upper limit temperature J, the heating air temperature is determined to be abnormal, and the burner STOP signal is output from the control device 22 to the drive circuit 26 provided in the burner device 14 (8). -4)
At the same time, 1 is added to the count N in order to store that the burner device 14 has stopped for the first time. Here, if the value of the heated air temperature W matches the value of the upper limit temperature J, the process may proceed to step (8-4). Next, RAM
A predetermined time is measured by a timer circuit provided in 22d (8-5). The predetermined time is appropriately set, and the time during which the temperature of the heated air and / or the dried air decreases to the outside air temperature, for example, 6 minutes, is appropriately set. During this 6 minutes, the exhaust fan 20, the take-out unit 10, and the recirculation means 11, 43 are still operating, and the outside air is taken into the ventilation pipe 12 and the drying unit 7, so that the heating air and the drying air gradually increase. At the same time, the temperature of the cereal circulating in the drying apparatus is lowered because the drying air is passed through the drying apparatus. After the predetermined time has elapsed, the drying air temperature sensor 21 detects the drying air temperature lowered to the outside air temperature and stores the detected temperature as the outside air temperature K1 in the RAM 22d (8-6). The outside air temperature K stored in the RAM 22d in the step (8-6)
1 is read out from the outside air temperature K1, for example, 3 ° C. (3 ° C. × 1
(N)) The subtracted value is stored in the RAM 22d as the outside air temperature K1 (8-7). Thereafter, the control device 22 outputs a burner start signal to the drive circuit 26 provided in the burner device 14 (8-8), and executes the step (6-) shown in FIG.
It returns to 1) moisture value detection. In step (8-7), when the burner device 14 is stopped for the second time, the count N becomes 2. Therefore, the outside air temperature K1 subtracted by 6.degree.
22d. Although not shown in the flowchart of FIG. 8, when an abnormal temperature of the heated air temperature is detected by the control device 22, an alarm can be sounded to notify the operator of the abnormality of the drying operation.

Returning to step (6-1) shown in FIG. 6, after the moisture value is detected, the predetermined temperature is reset according to the detected moisture value. At this time, since the outside air temperature K1 has been subtracted by 3 ° C. in the step (8-7), the temperature becomes 3 ° C. lower than the actual outside air temperature, and accordingly, the predetermined temperature is also set to be 3 ° C. lower. The temperature of the heated air heated by the burner device 14 becomes lower than before the burner device 14 was stopped by the control shown in FIG. 7, that is, the fuel reduction signal for lowering the dry air temperature by 3 ° C. to a predetermined temperature. Therefore, the temperature of the heated air is decreased by 3 ° C. from before the burner device 14 is stopped, and the temperature of the dried air is also decreased by 3 ° C. Therefore, when the burner device 14 is restarted, the grain can be safely operated, and even if the heating air temperature rises again, the drying air temperature is reduced until the heating air temperature reaches the abnormal temperature. Since the time is long, the time until the burner device 14 stops is long, during which the grain is dried. On the other hand, the heating air and / or the drying air are reduced to the outside air temperature and the grain temperature is also reduced, so that it is possible to prevent quality deterioration due to the continued overheating of the grain.

According to the control of the present invention, the temperature of the heated air rises in an emergency in which the air volume in the grain drying device is reduced, and the temperature rise until the abnormal temperature of the heated air is detected is reduced by the conventional method. As described above, there is no difference in size due to a difference in outside air temperature. The reason will be described. This is because the upper limit temperature J = the outside air temperature K1 + the abnormal reference temperature. More specifically, the abnormal reference temperature is, for example, 150 ° C. regardless of a change in the outside air temperature. The case where the outside air temperature is, for example, 5 ° C. and 20 ° C. will be described. Outside air temperature is 5
At ℃, the upper limit temperature is 155 ° C., and the temperature of the heated air is, for example, 145 ° C. On the other hand, when the outside air temperature is 20 ° C., the upper limit temperature is 170 ° C., and the heated air temperature is 160 ° C., which is 15 ° C. higher than the difference between the outside air temperatures. At this time, the temperature difference between the heated air temperature and the upper limit temperature is that the outside air temperature is 5 ° C and 20 ° C.
Even when the temperature differs from the temperature, the temperature is 10 ° C. Therefore,
Since the temperature rise width until the abnormal temperature of the heated air temperature is detected does not cause a difference in size between the outside air temperature as in the related art, the temperature of the grain heated by the ventilation pipe 12 does not vary. .

Further, as in the conventional case, even if the outside air temperature rises by more than the decrease of the drying air temperature (predetermined temperature) or more when the burner device 14 is stopped for a certain period of time and restarted, the abnormal temperature of the heating air is reduced. The upper limit temperature J for detecting
Is the upper limit temperature J = outside air temperature K1 + abnormal reference temperature, so that the burner device 14 does not stop. This will be specifically described. The abnormal reference temperature is, for example, 150 ° C. regardless of a change in the outside air temperature. The upper limit temperature J when the outside air temperature when the abnormal temperature of the heated air is detected is 20 ° C. is 17
It will be 0 ° C. Then, it is assumed that the outside air temperature when the burner device 14 is stopped and restarted for a predetermined time has risen to 23 ° C., and that the heating air temperature is lowered by 1 ° C. when the burner device 14 is restarted. In this case, the burner device 14 does not stop. The reason will be described. The temperature of the heated air at the time of reactivation is increased by 2 ° C., which is the difference between the temperature of the external air raised by 3 ° C. and the temperature of the heated air lowered by 1 ° C.
2 ° C. On the other hand, the upper limit temperature J at the time of restart is 173 ° C. as the outside air temperature (23 ° C.) + The abnormal reference temperature (150 ° C.). Therefore, the heating air temperature (172 ° C.) is
3 ° C.), so that it is not determined as an abnormal temperature. Therefore, the drying of the grain is continued without stopping the burner device 14.

Another embodiment relating to the control of the burner device at the time of the abnormal temperature of the heated air in FIG. 8 will be described with reference to FIGS. 9 and 10. The first is explained. In the control of FIG. 8, the burner device 14 is restarted after the stop after a predetermined time has elapsed by the timer. However, in the control shown in FIG. 9, the burner device 14 is restarted when the temperature of the heated air stops decreasing. To operate. In FIG. 9, a portion surrounded by a dashed line indicates a portion different from the control of FIG. This will be specifically described. The control device 22 outputs a burner STOP signal to the drive circuit 26 of the burner device 14 (9
After -1), 1 is added to the counter N, and the value of the heated air temperature S1 is set to 0 (zero) (9-2). The heating air temperature sensor 44 detects the heating air temperature S2 (9-
3). It is determined whether the heated air temperature S2 matches the heated air temperature S1 (9-4). If the values do not match in this determination, a predetermined time is waited for by a timer circuit provided in the ROM 22c (9-5). This predetermined time is a time during which the temperature of the heated air can be changed. After a lapse of a predetermined time, the value of the heating air temperature S2 is put into the heating air temperature S1 (9-
6) Return to step (9-3). After the heating air temperature sensor 44 detects the heating air temperature S2 again, it is determined whether the heating air temperature S2 matches the heating air temperature S1 (9-4).
I do. Thus, the heating air temperature S2 and the heating air temperature S
Steps (9-2) to (9-6) are repeated until 1 matches. On the other hand, if the heating air temperature S2 matches the heating air temperature S1 in the determination, the subsequent control is performed as shown in FIG.
The control is performed in the same manner as the control shown in FIG. The effect of this control is that the determination as to whether or not the temperature of the heated air has dropped to the outside air temperature after the burner device 14 is stopped is more accurate than the determination by the timer means shown in the embodiment of FIG.

The second will be described. In the control shown in FIG. 10, the burner device 14 is restarted when the temperature of the drying air no longer decreases. In FIG. 10, a portion surrounded by a dashed line indicates a portion different from the control of FIG. This will be specifically described. The control device 22 outputs a burner STOP signal to the drive circuit 26 of the burner device 14 (10-1).
After that, 1 is added to the counter N, and the drying air temperature Y
The value of 1 is set to 0 (zero) (10-2). The drying air temperature Y2 is detected by the drying air temperature sensor 21 (10-3).
It is determined whether or not the drying air temperature Y2 matches the drying air temperature Y1 (10-4). If the values do not match in this determination, the elapse of a predetermined time is waited for by a timer circuit provided in the ROM 22c (10-5). This predetermined time is
The time is set so that the changed drying air temperature can be detected. After a lapse of a predetermined time, the value of the drying air temperature Y2 is set to the drying air temperature Y1 (10-6), and the process returns to step (10-3). After the drying air temperature sensor 21 detects the drying air temperature Y2 again, it is determined again whether the drying air temperature Y2 matches the drying air temperature Y1 (10-4). Thus, the drying air temperature Y2
Until the air temperature Y1 matches the drying air temperature (step 10-).
Steps (10-6) are repeated from 2). On the other hand, if the determination is made that the drying air temperature Y2 and the drying air temperature Y1 match, the subsequent control is performed in the same manner as the control shown in FIG. The effect of this control is the same as that of the control in FIG.

Next, the structure and operation of the burner device 14 will be described. The combustion signal and fuel signal generated in FIGS. 5 and 7 are input to the drive circuit 26 of the burner device 14 shown in FIG. 12 via the I / O port 22a of the control device 22. The burner device 14 is connected to a burner fan 28, a light detection element 36, a fuel pump 37, an on-off valve (hereinafter referred to as a “valve”) 38, and an ignition transformer 39, with the drive circuit 26 at the center. When a combustion signal is input from the control device 22, the drive circuit 26 drives the burner fan 28 to drive the fuel pump 37, the valve 38 and the ignition transformer 3
Activate 9 The fuel pump 37 is connected to a fuel tank 40 and operates so as to continuously send a constant amount of fuel from the fuel tank 40 to the valve 38. The drive circuit 26 changes the opening / closing time of the valve 38 so as to change the fuel ejection amount. Increase or decrease. An electrode of an ignition transformer 39 is provided in the vicinity of the valve 38, and ignites the fuel ejected by opening and closing the valve 38 to burn it. Burner fan 28
Is to blow hot air generated by combustion. In response to a signal input from the control device 22, the drive circuit 26 stops driving the components and the valve 38.
Logic for changing the opening and closing of the drive circuit may be incorporated, or the drive circuit 26 may be constituted by incorporating a CPU or ROM.

The combustion of the burner device 14 is controlled by the drive circuit 26.
Is processed according to the control flowchart of FIG. In the burner device 14, when the signal is input, based on logic incorporated in the drive circuit 26,
The burner fan 28 is driven (11-1) to drive the fuel pump 37 with the valve initial value set to P, to open and close the valve 38 at the initial value P, and to drive the ignition transformer 39. When ignition is confirmed by the light detection element 36, the ignition transformer 39 is stopped. When the fuel reduction signal is received from the control device 22 after the burner device 14 is ignited in this way (11-2), it is determined whether the fuel signal has increased or decreased (1-2).
1-3) If the signal is a reduction signal, the opening time P of the valve 38 is reduced to reduce the fuel supply amount (11-4). The opening time P of the valve 38 at a certain time, for example, P
= 40 ms, and the hot air temperature is reduced by reducing the amount of fuel injected by reducing the amount of fuel injection by 2 ms in each step to reduce the amount of combustion.

In the burner device 14, if the fuel signal is an increase signal in the determination (11-3) of the increase or decrease of the fuel signal, the valve 38
Is increased (11-5) to increase the fuel injection amount. The valve 38 raises the hot air temperature by increasing the fuel supply amount by increasing the valve opening time P, for example, P = 40 ms in a certain period of time, by 2 ms, thereby increasing the combustion amount. The burner device 14 is
A burner STOP signal (11-) generated in the control device 22 at the end of drying or when the temperature of the heated air described later is abnormally high.
6), the fuel pump 37 and the valve 38 are stopped (11).
-7) Then, the burner fan 28 is stopped to extinguish the burner device 14. The increase / decrease range (one step) of the opening time of the fuel pump can be set arbitrarily.

Next, another embodiment will be described. This is an example in which an outside air temperature sensor (outside air temperature detecting means) 41 is added to the configuration of the grain drying apparatus 1 described above. Hereinafter, only different points will be described. In this embodiment, the outside air temperature sensor 41 is provided on the side surface of the bucket conveyor 11 as shown in FIG. The outside air temperature sensor 41 is connected to an I / O port 22a provided in the control device 22 via an A / D conversion circuit 42 as shown in FIG. Next, a control program of the grain drying apparatus 1 provided with the outside air temperature sensor 41 will be described. When the drying start switch 29d is turned on, the control program is executed. As shown in FIG. 14, the control device 22 outputs start signals of the take-out motor, the bucket conveyor motor and the fan motor to the motor drive circuit 25, and thereafter outputs the outside air temperature sensor 41. The outside air temperature K1
Is detected and stored (14-1) in the RAM 22d. Thereafter, the predetermined temperature of the drying air is determined based on the outside air temperature K1 in the same manner as the control described in the above embodiment, and the fuel signal is output to the burner device 14 so that the drying air temperature becomes the predetermined temperature. Is output to the drive circuit 26.

Next, the control of FIG. 15, which is a characteristic of the present invention, that is, the control of the burner device when the temperature of the heated air is abnormal is executed. The count N set in the ROM 22c is reset to 0 (zero). Next, the value H stored in the RAM 22d is entered into the outside air temperature K1 and stored in the RAM 22d. The outside air temperature K1 stored in the RAM 22d and the ROM 2
Read out the abnormal reference temperature stored in 2c and the outside air temperature K
1 is added to the abnormal reference temperature and stored as the upper limit temperature J in the RAM 22d (15-1). Next, heated air temperature sensor 4
4, the heated air temperature W is detected and stored in the RAM 22d (15-2). The upper limit temperature J and the heating air temperature W stored in the RAM 22d are read, and the upper limit temperature J and the heating air temperature W are compared (15-3). If the value of the heating air temperature W is smaller than the value of the upper limit temperature J, the aforementioned step (6-
Return to 1). On the other hand, if the value of the heated air temperature W is higher than the value of the upper limit temperature J, the control device 22 outputs a burner STOP signal to the drive circuit 26 provided in the burner device 14 (1).
5-4) At the same time, 1 is added to the count N because it is the first stop of the burner device. Next, the drying air temperature G detected by the drying air temperature sensor 21 is stored in the RAM 22d.
(15-5). The outside air temperature K1 detected by the outside air temperature sensor 41 is stored in the RAM 22d (1
5-6). Next, the outside air temperature K1 and the drying air temperature G stored in the RAM 22d are read, and it is determined whether the value of the outside air temperature K1 matches the value of the drying air temperature G (15-7). In this determination, if the value of the outside air temperature K1 does not match the value of the dry air temperature G, the process returns to step (15-5). On the other hand, if the value of the outside air temperature K1 matches the value of the dry air temperature G, the value of the outside air temperature K1 stored in the RAM 22d is stored as a value H in the RAM 22d again. Next, the outside air temperature K1 stored in the RAM 22d is read, and a value obtained by subtracting, for example, 3 ° C. (3 ° C. × 1 (N)) from the outside air temperature K1 is stored in the RAM 22d as the outside air temperature K1 (15-8). Thereafter, the control device 22 outputs a burner start signal to the drive circuit 26 of the burner device 14 (15-9).

After that, returning to step (6-1) shown in FIG. 6, after the above-mentioned predetermined temperature setting control by the grain moisture of FIG. 6 and the above-mentioned fuel increase / decrease control of the burner device 14 of FIG. The control of the burner device 14 at the time of the abnormal heating air temperature shown in FIG. 15 is performed. Step (15
In the resetting of the upper limit temperature J performed in -1), after the burner device 14 is stopped, the outside air temperature when the value of the outside air temperature K1 matches the value of the drying air temperature G in the comparison in step (15-7) is reduced. Used. Thereby, even if the outside air temperature at the start of the restart of the burner device 14 is higher than the outside air temperature at the time of the stop of the burner device 14 by a decrease of the dry air temperature (predetermined temperature) or more, the upper limit at the start of the restart Since the temperature is also increased with the outside air temperature, the temperature of the heated air does not exceed the upper limit temperature as in the related art even when the restart is started. Therefore, since the heating air temperature is not sensed as an abnormal temperature, the drying operation can be continued without stopping the heating air generating means.

Since the upper limit temperature J is a value obtained by adding the outside air temperature to the abnormal reference temperature, it changes according to the change in the outside air temperature. Therefore, even if the outside air temperature is different,
The temperature difference between the heating air temperature and the upper limit temperature is constant, and the temperature rise width until the abnormal temperature of the heating air temperature is detected does not differ by the difference in the outside air temperature as in the past. The temperature of the grain heated by the tube 12 does not vary.

Further, by providing the outside air temperature sensor 41, the restart of the burner device 14 after the burner device 14 is stopped can be started when the temperature of the dry air reaches the outside air temperature. During the shutdown of the burner device 14,
Take-out part 10, recirculation means 11, 43 and exhaust fan 2
Since the temperature 0 is activated, the temperature of the grain circulating in the drying device is reduced by the ventilation of the dried air whose temperature has dropped. Therefore, it is possible to prevent a decrease in the quality of the grain due to the continuation of the overheating state.

[0045]

According to the first aspect of the present invention, the dry air temperature detected by the dry air temperature detecting means before the operation of the heated air generating means is set as the outside air temperature, and an upper limit obtained by adding a predetermined abnormal reference temperature to the outside air temperature. The temperature and the heating air temperature detected by the heating air temperature detecting means are repeatedly compared to stop the heating air generating means when the heating air temperature exceeds the upper limit temperature or when the heating air temperature matches the upper limit temperature. , And thereafter, a grain drying apparatus provided with control means for instructing the heated air generating means to reactivate so as to generate heated air having a lower temperature than before the stop. Since the upper limit temperature is a value obtained by adding the outside air temperature to the abnormal reference temperature, it changes according to the change in the outside air temperature. Therefore, even when the outside air temperature is different, the difference temperature between the heated air temperature and the upper limit temperature is constant, and the temperature rise width until the abnormal temperature of the heated air temperature is detected is different from the outside air temperature as in the conventional case. Therefore, the temperature of the grain heated by the ventilation tube 12 does not vary.

According to a second aspect of the present invention, when the temperature of the heated air exceeds the upper limit temperature, the control means controls the temperature of the heated air and / or the temperature of the heated air.
Alternatively, the heated air generating means is stopped for a predetermined time so that the dry air temperature approaches the outside air temperature, and the dry air temperature detected by the dry air temperature detecting means when the predetermined time has elapsed is set as a new outside air temperature. Taking technical measures.
Therefore, a dry wind that lowers the temperature is sent to the grain. As a result, the grain temperature is reduced, so that it is possible to prevent quality deterioration due to the continuation of the overheated state of the grain. Further, even if the outside air temperature sensor for detecting the outside air temperature is not provided, the drying air temperature by the drying air temperature detecting means at the time of restarting the heating air generation means can be grasped as the outside air temperature. Can be set again. Thereby, even if the outside air temperature at the start of the restart of the burner device 14 is higher than the outside air temperature at the time of the stop of the burner device 14 by a decrease of the dry air temperature (predetermined temperature) or more, the upper limit at the start of the restart Since the temperature is also increased with the outside air temperature, the temperature of the heated air does not exceed the upper limit temperature as in the related art even when the restart is started. Therefore, since the heating air temperature is not sensed as an abnormal temperature, the drying operation can be continued without stopping the heating air generating means.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view of a grain drying device embodying the present invention.

FIG. 2 is a side view in which a part of the grain drying device embodying the present invention is broken.

FIG. 3 is a plan cross-sectional view of a drying unit of the grain drying device embodying the present invention.

FIG. 4 is a control block diagram of a grain drying device embodying the present invention.

FIG. 5 is a flowchart for setting a predetermined temperature based on the amount of grain stuck in the control device.

FIG. 6 is a flowchart for changing a predetermined temperature based on a grain moisture value in a control device.

FIG. 7 is a control flowchart of a control device for the burner device.

FIG. 8 is a control flowchart of a control device for the burner device when an abnormal temperature of heated air is detected.

FIG. 9 is a modified example of the control flowchart of the control device for the burner device when the abnormal temperature of the heated air is detected.

FIG. 10 is a modified example of the control flowchart of the control device for the burner device when the abnormal temperature of the heated air is detected.

FIG. 11 is a control flowchart of the burner device.

FIG. 12 is a block diagram showing a burner device.

FIG. 13 is a modified example of the control block diagram of the grain drying device embodying the present invention.

FIG. 14 is a modified example of a flowchart for setting a predetermined temperature based on a grain sticking amount in the control device.

FIG. 15 is a modified example of the control flowchart of the control device for the burner device when the abnormal temperature of the heated air is detected.

FIG. 16 is a partially cutaway front view of a conventional grain drying apparatus.

FIG. 17 is a side view in which a part of the conventional grain drying device is cut away.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Grain drying apparatus 2 Storage tank 3 Blast path 4 Exhaust path 5 Grain distribution lower tank 6 Perforated plate 7 Drying unit 8 Valve 9 Screw conveyor 10 Take-out unit 11 Bucket conveyor 12 Ventilation tube 13 Heating unit 14 Burner device (heating air generating means 15 Front air path 16 Rear air path 17 Outside air inlet 18 Moisture detector 20 Air exhaust fan (air exhaust unit) 21 Dry air temperature sensor (dry air temperature detector) 22 Controller (control unit) 22a I / O port 22b CPU 22c Read-only memory (ROM) 22d Read / write memory (RAM) 23 A / D conversion circuit 24 A / D conversion circuit 25 Motor drive circuit 25a Fan motor 25b Take-out part motor 25c Bucket conveyor motor 26 Burner drive circuit 28 Burner fan 29 Input section 29a Switch 29b Moisture setting switch 29c Tension button 29d Dry button 29e Eject button 36 Photodetector 37 Fuel pump 38 Valve 39 Ignition transformer 40 Fuel tank 41 Outside air temperature sensor (outside air temperature detection means) 42 A / D conversion circuit 43 Screw conveyor 44 Heating air temperature sensor (heating air temperature detecting means) 45 A / D conversion circuit

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3L113 AA07 AB03 AC04 AC40 AC41 AC78 AC81 BA03 CA08 CB03 CB35 CB37 DA08 DA10 DA11 DA24 4D043 AA02 AA05 BB02 BB15

Claims (8)

[Claims] 1. A storage unit for storing grains, a heating unit for bringing the grains directly into contact with a ventilation pipe heated by the heated air heated by the heated air generating means to raise the grain temperature in advance,
A drying unit that blows the heated air that has passed through the ventilation pipe of the heating unit to the grain as drying air to dry the grain, and a discharging unit that discharges the grain to the outside of the drying device are sequentially provided, and the grain discharged from the discharging unit is provided. In a grain drying device, comprising: a reflux unit for returning to the storage unit; and a wind discharging unit for discharging the drying air of the drying unit to the outside of the drying device, wherein a temperature of the heated air heated by the heated air generating unit is adjusted. Heating air temperature detecting means for detecting, a drying air temperature detecting means for detecting a drying air temperature in the drying section, and a drying air temperature detected by the drying air temperature detecting means before operation of the heating air generating means as an outside air temperature. When the heating air temperature exceeds the upper limit temperature by repeatedly comparing the upper limit temperature obtained by adding a predetermined abnormal reference temperature to the outside air temperature and the heating air temperature detected by the heating air temperature detecting means, or the heating air temperature Is Control means for instructing the heating air generating means to stop when the temperature reaches the limit temperature, and thereafter instructing the heating air generating means to reactivate so as to generate heating air having a lower temperature than before the stop. A grain drying device. 2. The heating device according to claim 1, wherein the control unit stops the heating air generation unit for a predetermined time so that the heating air temperature and / or the drying air temperature approaches the outside air temperature when the heating air temperature exceeds the upper limit temperature. 2. The grain drying device according to claim 1, wherein the drying air temperature detected by the drying air temperature detecting means after a lapse of time is set as a new outside air temperature. 3. The control means stops the heating air generation means when the heating air temperature exceeds the upper limit temperature until the drying air temperature detected by the drying air temperature detection means does not decrease. The grain drying device according to claim 1, wherein the drying air temperature detected by the drying air temperature detecting means is set as a new outside air temperature. 4. When the heating air temperature exceeds the upper limit temperature, the control means stops the heating air generation means until the heating air temperature detected by the heating air temperature detecting means does not decrease. The grain drying device according to claim 1, wherein the drying air temperature detected by the drying air temperature detecting means is set as a new outside air temperature. 5. A storage section for storing grains, and a heating section for directly raising the grains by bringing the grains into direct contact with the ventilation pipe heated by the heated air heated by the heated air generating means;
A drying unit that blows the heated air that has passed through the ventilation pipe of the heating unit to the grain as drying air to dry the grain, and a discharging unit that discharges the grain to the outside of the drying device are sequentially provided, and the grain discharged from the discharging unit is provided. In a grain drying device, comprising: a reflux unit for returning to the storage unit; and a wind discharging unit for discharging the drying air of the drying unit to the outside of the drying device, wherein a temperature of the heated air heated by the heated air generating unit is adjusted. Heating air temperature detecting means for detecting, an outside air temperature detecting means for detecting an outside air temperature outside the drying apparatus, an upper temperature obtained by adding a predetermined abnormal reference temperature to the outside air temperature detected by the outside air temperature detecting means, and heating air When the heating air temperature exceeds the upper limit temperature by repeatedly comparing the heating air temperature detected by the temperature detecting means and the heating air temperature matches the upper limit temperature, the heating air generating means is instructed to stop, That , Grain drying apparatus characterized by comprising control means for commanding re-activation to heated air stream generating means to generate a heated air stream of lower than before the stop temperature, the. 6. A drying air temperature detecting means for detecting a drying air temperature in the drying section, wherein the control means detects a temperature of the outside air temperature detecting means and a temperature of the drying air temperature detecting means when the heating air temperature exceeds an upper limit temperature. 6. The grain drying apparatus according to claim 5, wherein a command is issued to the heated air generating means to stop until the detected temperature matches. 7. The control means detects a temperature detected by the outside air temperature detecting means when the temperature detected by the outside air temperature detecting means coincides with the temperature detected by the drying air temperature detecting means after the stop of the heated air generating means. 7. A new outside air temperature.
A cereal drying device as described. 8. The apparatus according to claim 1, wherein said control means keeps operating said discharge means, recirculation means and air discharge means while said heating air generation means is stopped. A grain drying apparatus according to any one of the above.