JPH06273039A - Grain drying control system of grain dryer - Google Patents

Abstract

(57) [Summary] [Purpose] At the start of grain drying, the moisture content of the grain is high,
Alternatively, it is intended to shorten the total drying time even for a grain having a large variation in moisture content. [Composition] At the start of grain drying, when the moisture content of the grain is higher than the prescribed moisture content of the grain, or the variation of the moisture content of the grain is larger than the variation of the moisture content of the prescribed grain, ventilation drying for drying the grain by outside air is The control is performed only once for a predetermined time. [Effect] Even when the moisture content of the grain is high or the moisture content of the grain is large, it is possible to prevent the total drying time from becoming long because the ventilation drying is performed only once for the predetermined time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grain drying control system for a grain dryer.

[0002]

2. Description of the Related Art Conventionally, while a grain is delivered from a grain storage chamber to a grain drying chamber and circulated while being dried, hot dry air generated from a hot air device passes through the dry chamber.
The circulating grains are exposed to this dry hot air and dried with hot air, or by stopping the dry hot air and allowing the outside air to pass through the drying chamber, the circulating grains are dried. Exposed to air and dried by ventilation.

Whether this hot air drying or this ventilation drying is
When the moisture content of the grain detected by the moisture sensor at the start of drying is higher than the prescribed grain moisture or the variation in the detected grain moisture is larger than the variation in the prescribed grain moisture, the grain is dried by ventilation for a predetermined time. If the grain moisture detected by the moisture sensor is high moisture equal to or higher than the predetermined grain moisture, or the variation in the detected grain moisture is larger than the predetermined grain moisture variation after the predetermined time has elapsed Is again ventilated and dried for a predetermined time, and the detected grain moisture is low until the moisture is lower than the prescribed moisture, or the variation in the detected grain moisture is smaller than the prescribed grain moisture variation. When drying is repeated and low moisture below a prescribed moisture level or grain moisture variation smaller than a prescribed moisture variation is detected, it is exposed to the dry hot air generated from the hot air device and is switched to hot air drying. Is your was grain drying control scheme hot air drying.

[0004]

The grains stored in the grain storage chamber of the grain dryer are discharged from this storage chamber to the grain drying chamber and are circulated while flowing down, while the moisture content is increased at the start of the drying process. When the moisture content of the grain detected by the sensor is higher than the predetermined moisture content of the grain, or when the variation in the moisture content of the detected grain is larger than the variation in the moisture content of the predetermined grain, the outside air blows through the drying chamber to allow the drying. The grain flowing down in the chamber is exposed to the outside air for a predetermined time and ventilated and dried, and after this predetermined time has elapsed, the detected grain moisture is high moisture equal to or higher than the prescribed grain moisture, or the detected grain moisture varies. Is larger than the predetermined grain moisture variation, low moisture equal to or less than the predetermined grain moisture variation, or until the moisture variation smaller than the predetermined grain moisture variation is detected, ventilation drying is repeatedly performed for a predetermined time to perform ventilation drying. It

When a water content lower than a predetermined grain water content or a water content variation smaller than a predetermined grain water content variation is detected, dry hot air is generated from the hot air device, and the generated dry hot air passes through the drying chamber. By doing so, the grains flowing down through the drying chamber are exposed to the hot dry air and dried with hot air. When the moisture content of the grain is high or there is a large variation in the moisture content of the grain, ventilation drying is performed many times by determining ventilation drying again each time, and the total drying time becomes longer. There are cases in which it is intended to eliminate this.

[0006]

According to the present invention, the dry hot air generated from the hot air device 3 is fed to the drying chamber 9 while feeding and flowing down the grains from the upper grain storage chamber 8 to the lower grain drying chamber 9. To start drying in a grain dryer provided with a moisture sensor 2 for detecting the moisture of the grain, as well as being provided to ventilate and dry with hot air, or to stop the dry hot air and ventilate with outside air. When the moisture content of the grain detected by the moisture sensor 2 is higher than the moisture content of the predetermined grain, or when the variation of the moisture content of the grain is larger than the variation of the moisture content of the predetermined grain, after performing the ventilation drying for a predetermined time. The process shifts to the hot air drying, but at this time, the grain moisture detected by the moisture sensor 2 is higher than the predetermined grain moisture, or the grain moisture variation is larger than the predetermined grain moisture variation, and the ventilation drying is performed again. Condition that meets the conditions for transition Even, the structure of grain drying control method to vent air drying, characterized in that the drying is controlled so as to shift to heat air drying without re migration.

[0007]

The grain stored in the grain storage chamber 8 of the grain dryer is fed from the storage chamber 8 to the grain drying chamber 9 and is circulated while flowing down, and at the time of starting the drying, the moisture content is reduced. When the grain moisture detected by the sensor 2 is a high moisture content equal to or higher than a predetermined grain moisture, or when the detected grain moisture variation is larger than the predetermined grain moisture variation, the outside air is passed through the drying chamber 9, The grain flowing down in the drying chamber 9 is exposed to the outside air for a predetermined time and is dried by ventilation, and when this predetermined time passes, dry hot air is generated from the hot air device 3, and the generated dry hot air is the dried air. By passing through the chamber 9, the grain flowing down in the drying chamber 9 is exposed to the dry hot air and dried, and the grain moisture detected by the moisture sensor 2 reaches a predetermined grain moisture. The dryer is stopped and controlled so that the drying of the grain is stopped.

[0008]

According to the present invention, when the grain water content at the start of drying is higher than the predetermined grain water content or the grain water content variation is larger than the predetermined grain water content variation, the outside air is blown only once for a predetermined time period. However, it was possible to prevent the total drying time from being lengthened by the ventilation drying which passes through the grain drying chamber 9 and is dried.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. The illustrated example is a circulation type grain dryer 1 for drying grains.
It shows a state in which a moisture sensor 2 for detecting moisture of the grain, a burner 4 of a hot air device 3 for generating hot dry air, and the like are attached.

The dryer 1 has a rectangular shape that is long in the front-rear direction and has a transfer gutter 6 and a ceiling plate 7 in which a transfer spiral is rotatably installed on the upper part of the machine wall 5, and below the ceiling plate 7 is a grain. A grain storage chamber 8 for storing grains is formed. Grain drying room 9,
Reference numeral 9 denotes a ventilation chamber 1 on the left and right sides below the storage chamber 8.
0 and 10 are provided between the blower chamber 11 and the central blower chamber 11. At the lower portions of the drying chambers 9 and 9, feed valves 12 for feeding and flowing the grains are rotatably supported.

The grain collecting trough 13 rotatably supports a transfer spiral, and is provided below the drying chambers 9 and 9 to communicate with each other. The burner 4 of the hot air device 3 is provided internally in a burner case 14, and the burner case 14 is provided in the front machine wall 5
On the front side, the dryer 1 is detachably provided on the outer surface of the front side machine wall 5 so as to correspond to the inlet side of the blower chamber 11.
An operating device 15 for starting and stopping the moisture sensor 2 and the burner 4 for each of the operations of tensioning, drying and discharging is detachably provided on the front machine wall 5.

The exhaust fan 16 has an exhaust passage chamber 17 provided on the rear machine wall 5 so as to communicate with the left and right exhaust chambers 10, 10.
An exhaust fan motor 19 for rotating the exhaust fan 16 is provided on the rear machine wall 5 in the central rear side exhaust cylinder 18. The valve motor 20 is the delivery valve 1
2 and 12 are rotationally driven via a reduction mechanism.

The fuel pump 21 has a fuel valve,
The fuel pump 21 is provided outside the lower plate of the burner case 14, and by opening and closing the fuel valve, the fuel in the fuel tank 22 is sucked by the fuel pump 21 and supplied to the burner 4. The blower 23 is provided on the outer side of the upper plate, and is used to change the blower motor 2
4, the variable speed rotation drive is performed, and combustion air corresponding to the supplied fuel amount is blown to the burner 4 by the blower 23.

The diffusion board 25 is provided at the central portion of the bottom plate of the transfer gutter 6 in the front-rear direction and below the supply port for supplying the transfer grains to the storage chamber 8, and evenly diffuses the grains to the storage chamber 8. I'm giving back. The grain-raising machine 26 is provided on the outer side of the front side machine wall 5 and has a belt with a bucket conveyor 27 stretched inside thereof, and the upper end of the grain raiser 28 is provided between the transfer gutter 6 and the starting end thereof. Is provided to communicate with each other, and the lower end is the grain collecting gutter 13
A supply gutter 29 is provided between the end portion and the end portion to communicate with each other.

The grain elevator motor 30 rotationally drives the belt with the bucket conveyor 27, the transfer spiral in the transfer gutter 6, the diffusion plate 25, the transfer spiral in the grain collecting gutter 13, and the like. The moisture sensor 2 is the grain elevator 26.
The moisture sensor 2 is provided substantially in the central portion in the vertical direction, and the moisture motor 31 is rotated by the transmission of an electrical measurement signal from the operating device 15 to rotationally drive each portion of the moisture sensor 2 and the bucket conveyor. At 27, the grain falling during the transportation to the upper part is received, and the moisture of this crushed grain is detected while crushing the grain with pressure.

The operating device 15 has a box shape, and a display means 32 for displaying various items, for example, in a liquid crystal format on the surface plate of the box body, and below the display means 32, the drying device 1 is provided. Function setting means 33a, 33 of a plurality of push button type ON-OFF switches for setting various functions
b, 33c, 33d and stop means 34 for stopping operation are provided, and these function setting means 33a, 33b, 33c, 33 are provided.
The function set by the operation of d is displayed on the display means 32.

The function display of these function setting means 33a, 33b, 33c, 33d before the start of each work of loading, drying and discharging is displayed on the display means 32 as shown in FIG. I am letting you. Also, these function setting means 33a, 33 when setting the grain type, the drying mode, etc.
The function display of b, 33c and 33d is displayed on the display means 32 as grain, mode, change and return as shown in FIG.

The control device 35 is provided in the operation device 15, and detects the paddy flow sensor 36, inputs digital information, and sets the respective function setting means 33a, 33b, 33c, 33d,
A digital input circuit (A) 37 to which the operation of the stopping means 34 is input, an input of analog sensor information, and an analog input circuit 39 to which detection values detected by the moisture sensor 2 and the hot air temperature sensor 38 are input, AD. The conversion circuit 40, the serial data transmission circuit 41, the digital input circuit (B) 43 to which the memory clear 42 is input, and these circuits 37 and 3
The dryer control microcomputer 44 and the memory 45 that perform arithmetic logic operation and comparison operation on the inputs from 9, 40, 41 and 43, and the blower via the output circuit (A) 46 in response to a command from the dryer control microcomputer 44. The motor 19 is controlled to start and stop, the valve motor 20 and the grain elevator motor 30 are controlled to start and stop through an output circuit (B) 47, and the fuel valve and the fuel pump are controlled through an output circuit (C) 48. 21 to start, stop and adjust control, start, stop and adjust control of the blower motor 24 via the output circuit (D) 49, start and stop control of the moisture motor 31 via the output circuit (E) 50, Various items are displayed on the display means 32 via the display circuit 51, and the serial data receiving circuit 52 and the non-volatile memory 53 are provided.

The dryer 1 has the function setting means 33c.
Is a configuration in which the drying rate of the grain is set, and the drying rate of the grain is calculated from the moisture content of the grain detected by the moisture sensor 2, and the calculated drying rate and setting The drying hot air temperature generated by the burner 4 is controlled to be a predetermined temperature high temperature or a predetermined temperature low temperature so as to be the same as the set drying speed if the drying speed and the drying speed are different.

In the dryer 1, the moisture content of the grain being dried is
For example, when it reaches 18%, the dry hot air generated from the burner 4 is stopped and the hot air drying is stopped and controlled for a predetermined time.
It is configured to dry at rest. The control of the hot air drying of drying with the hot dry air and the ventilation drying of the outside air with the control device 35 are performed as follows. That is, the function setting means 3 for starting the drying operation
It is detected whether 3b is operated and turned on (step 10
1), if NO is detected, the process returns to step 101 and YE
When S is detected, each of the motors 19, 20, 24, 3
The output of the fuel valves 0 and 31 of the combustion system and the output of the fuel pump 21 is turned on (step 102), the moisture content of the grain is measured by the moisture sensor 2, and the grain moisture value is calculated ( In step 103), the variation of the grain moisture is calculated from the detected grain moisture, and the average value processing is performed (step 104). It is detected whether or not the number of the grain moisture is detected a predetermined number N times (step 105), and NO is detected. If so, the process returns to step 103, and if YES is detected, determination is made based on the detected grain moisture value (step 106), and it is detected whether the moisture content is higher than a predetermined grain moisture value (step 10).
7) If NO is detected, determination is made based on grain moisture variation (step 108), and it is detected whether it is larger than a predetermined grain moisture variation (step 109), step 1
If YES is detected in step 07 and step 109, the output of the fuel valve and the fuel pump 21 of the combustion system is turned off (step 110), and ventilation drying by outside air is set for a predetermined time to perform ventilation drying (step 111). , It is detected whether the set predetermined time has elapsed (step 11
2) If NO is detected, the process returns to step 112 and YE
When S is detected, the output of the fuel valve of the combustion system and the output of the fuel pump 21 are turned on (step 113), and the moisture sensor 2 measures the moisture content of a predetermined number of grains to calculate the moisture value of the grain. (Step 114), N in step 109
If O is detected, the process proceeds to step 114. Further, the grain moisture variation is calculated from the detected grain moisture, and the average value processing is performed (step 115), and the dry hot air temperature is corrected by the detected grain moisture variation (step 116), and the detected grain moisture value is calculated. The set grain is displayed on the display unit 32 (step 117) and the grain moisture variation calculated from the detected grain moisture is displayed on the display unit 32 (step 118), and the detected grain moisture is set. If the water content is detected or less (step 119), if NO is detected, the process returns to step 114, and if YES is detected, each motor 19,
20, 24, 30, 31 and the output of the fuel valve of the combustion system and the output of the fuel pump 21 are turned off, and the dryer 1 is stopped, so that the drying of the grain is completed (step 120). .

The control of hot air drying and pause drying by the control device 35 is performed as follows. That is, the function setting means 33b for starting the drying operation is operated to start the drying operation (step 201), and it is detected whether the hot air drying is controlled to switch to the pause drying (step 2).
02), if YES is detected, the drying hot air temperature set by the drying speed at the time of hot air drying in the preceding stage, which switches to pause drying, is stored in the memory 45 of the control device 35 (step 203), and from step 202. The configuration is repeated to step 203. When NO is detected in step 202, it is detected whether the pause drying is switched to hot air drying (step 204). When NO is detected, the process returns to step 202. When YES is detected, the drying speed is set. The stored dry hot air temperature is restored, and hot air drying is restarted at this dry hot air temperature (step 20).
5), the configuration is repeated from step 202 to step 204 and step 205.

By performing the above control, when switching control from rest drying to hot air drying is performed again, re-hot air drying is started at the drying hot air temperature at the time of hot air drying before switching to rest drying. By doing so, it is possible to prevent the drying time after re-drying from becoming long by being dried at a low dry hot air temperature, or when drying at a high dry hot air temperature causes frequent cracking of grains after re-drying. It is configured to prevent such things.

The operation of the above embodiment will be described below. Each function setting means 33a, 33b, 3 of the operating device 15
3c and 33d are operated to set respective functions and the drying operation is started. By operating the function setting means 33b, each unit of the grain dryer 1, the moisture sensor 2 and the like are started, and the grain storage chamber 8 is started. The grains housed in the storage chamber 8 pass through the grain drying chambers 9, 9, the grain collecting trough 13, the supply trough 29, and the grain raising machine 26.
It is supplied to the inside, is conveyed to the upper part by the grain raising machine 26, is supplied to the inside of the transfer gutter 6 through the throw-out cylinder 28, and is evenly diffused from the transfer gutter 6 through the diffusion plate 25 into the storage chamber 8. Is circulated.

The moisture content of the circulating grain is detected by the moisture sensor 2, and the detected moisture content of the grain is higher than the predetermined moisture content of the grain, or the variation of the detected moisture content of the grain is the predetermined moisture content. When it is larger than the variation, the outside air is blown into the drying chamber 9,9.
Passing through each of the exhaust chambers 10, 10 and the exhaust passage chamber 17 and being sucked and exhausted by the exhaust fan 23, the drying chamber 9,
The grains flowing down in 9 are exposed to the outside air for a predetermined time and dried by ventilation.

When this predetermined time elapses, the burner 4 of the hot air device 3 is started, and the set dry hot air is generated from the burner 4. The dry hot air passes through the drying chambers 9 and 9 and the exhaust air is exhausted. The grains flowing down in the drying chambers 9 and 9 are exposed to the hot dry air by being sucked and discharged by the air blower 23 through the chambers 10 and 10 and the exhaust passage chamber 17. To be dried.

When the grain moisture detected by the moisture sensor 2 is the same as the finish target moisture set, it is detected that the drying is completed, and the controller 34 automatically controls the drying. The machine 1 is automatically stopped and the drying of the grain is stopped.

[Brief description of drawings]

 The figure shows an embodiment of the present invention.

FIG. 1 Block diagram

FIG. 2 Flow chart

[Fig. 3] Side view of the grain dryer that can be partially broken

FIG. 4 is an enlarged sectional view taken along line AA of FIG.

FIG. 5 is an enlarged front view in which a part of the operating device is broken.

FIG. 6 is an enlarged front view in which a part of the operating device is broken.

FIG. 7: Flow chart

[Explanation of symbols]

 2 Moisture sensor 3 Hot air device 8 Grain storage room 9 Grain drying room

Claims (1)

[Claims] 1. Drying hot air generated from the hot air device 3 into the drying chamber 9 while letting the grains flow down from the upper grain storage chamber 8 to the lower grain drying chamber 9 and drying with hot air, or In a grain dryer provided with a moisture sensor 2 for detecting moisture of the grain, the moisture sensor 2 is provided when the drying is started, while the drying hot air is stopped and the outside air is ventilated to perform ventilation drying. When the detected grain water content is higher than the predetermined grain water content, or when the variation of the grain water content is larger than the predetermined grain water content variation, the hot air drying is performed after performing the ventilation drying for a predetermined time, At this time, the grain moisture detected by the moisture sensor 2 is higher than the predetermined grain moisture, or the grain moisture variation is larger than the predetermined grain moisture variation, and the condition for shifting to the ventilation drying again is satisfied. Even if there is, the ventilation drying A grain drying control method characterized by controlling and drying so as to shift to the hot air drying without shifting the temperature.