JPH1114261A - Drying control device for grain dryer - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To reduce the quality deterioration by appropriately setting the temperature of hot air in accordance with the progress of grain drying. SOLUTION: A hot air control device for changing the hot air temperature to low / high based on the high / low of the detected moisture value in advance and providing drying while maintaining the hot air temperature is provided. Drying is performed slowly without causing excessive heat drying of the grains due to the low hot air temperature, and the hot air temperature is increased as drying proceeds, that is, as the moisture value decreases, and drying is performed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a drying control device for a grain dryer.

[0002]

2. Description of the Related Art The moisture content of grains is reduced by continuation of hot-air drying.
(See, for example, Japanese Unexamined Patent Publication No.
06374).

[0003]

However, in the case of the above-described embodiment in which the hot air temperature is changed depending on the amount of infiltration, since the moisture value is not taken into consideration, the moisture transfer particularly in the early stage of drying having a high moisture value is intense, and the kernel It is easy to cause deterioration.

[0004]

SUMMARY OF THE INVENTION The present invention is intended to solve the above-mentioned drawbacks. The present invention sets the hot air temperature to low or high based on the detected moisture value in advance and maintains the hot air temperature. The drying control device of the grain dryer is provided with a hot-air control device that advances drying.

[0005]

According to the above-mentioned structure, in the initial stage of drying having a high water content, the set hot air temperature is low, and the grains are dried slowly without causing excessive heating and drying of the grains. In other words, the set hot air temperature increases as the moisture value decreases, so that drying can be performed without lowering the drying speed, and drying can be performed without deteriorating the grain quality. is there.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. In the illustrated example, reference numeral 2 denotes a grain dryer. Inside the dryer 2, the upper part of each drying chamber 3, both sides of which are separated by a ventilation network, is opened to communicate with the storage chamber 4, and the lower part is connected to a feeding valve 5. Then, it is configured to communicate with the grain collecting trough 6 which supports the transfer spiral. The storage chamber 4 is formed in a cavity surrounded by a machine wall 7, and a ceiling plate 8 and a transfer gutter 9 supporting a transfer spiral are provided above the storage chamber 4. A supply port for supplying grains into the storage chamber 4 is provided. A diffusion plate 10 is provided below the supply port to uniformly diffuse and reduce grains.

The hot air chamber 11 is formed between the insides of the drying chambers 3, and a hot air temperature sensor 12 is provided in the hot air chamber 11. An exhaust chamber 13 is formed outside each drying chamber 3, and an operating device 14 for starting and stopping the dryer 2 and a burner case 16 containing the burner 1 are provided on the front machine wall 7. The burner 1 communicates with the hot air chamber 11. An exhaust fan 17 and a motor 18 are provided on the rear machine wall 7, and the exhaust fan 17 and the exhaust chambers 13 communicate with each other.
The transfer spiral in the grain collecting trough 6, the delivery valve 5, the exhaust fan 17, and the like are rotated and linked by a motor 18.

The burner 1 is provided with a fuel pump 19 having a fuel valve outside the burner case 16.
A blower 21 and a speed change motor 22 are provided on the upper and outer sides. The grain raising machine 23 is provided in the front part of the front machine wall 7, and internally a bucket conveyor 24 belt is stretched between upper and lower pulleys,
A discharge tube 25 is provided and communicated between the upper end and the start end of the transfer gutter 9, and a supply gutter 26 is provided and communicated between the lower end and the end of the grain collection gutter 6. A motor 27 is provided in the upper part of the grain raising period 23, and the motor 27 rotates the belt conveyor 24 belt, the transfer spiral in the transfer gutter 9, the diffusion plate 10, and the like. At the substantially central portion in the direction, a grain falling during transportation to the upper portion by the bucket conveyor 24 is received, and the grain is pinched and pulverized. At the same time, a moisture sensor 28 for detecting the moisture of the pulverized grain is provided. The sensor 28 includes the moisture sensor 2
8 is provided with a motor 29 for rotating and driving each section.

The operating device 14 has a box shape, and a start switch 30 for starting the dryer 2 for each of the operations of inserting, drying and discharging, a stop switch 31 for stopping the drying, The grain type setting knob 32, the inset amount setting knob 33, the moisture setting knob 34 for setting the finishing target moisture of the grain, the hot air temperature, A display window 35 and the like for displaying the grain moisture and the remaining time are provided, and an outside air temperature sensor 36 for detecting the outside air temperature is provided outside the lower plate. Further, a drying control device 37 and a hot air control device 38 are formed inside.

Each of the setting knobs 32, 33, and 34 is of a rotary switch type, and a part of the reference for setting the temperature of the hot air generated from the burner 1 is set by operating the setting knobs 32 and 33. The finish target moisture of the grain is set according to the operation position of the setting knob 34. The hot air control device 38 includes an A / D converter 39 for A / D converting detection values detected by the hot air temperature sensor 12, the moisture sensor 28, and the outside air temperature sensor 36, and the A / D converter 3
9, an input circuit 40 to which the converted value is input, a circuit 41 to which the operation of each of the setting knobs 32, 33 are input, and an arithmetic logic operation of various input values input from each of these input circuits 40, 41 And a CPU 42 for performing a comparison operation, etc.
An output circuit 43 for receiving and outputting various commands from U42 is provided.

The drying control device 37 includes a start switch 3
0, an input circuit to which the operations of the stop switch 31 and the moisture setting knob 34 are input, and various input values input from the input circuit for performing arithmetic logic operation, comparison operation and the like.
U42 is provided with an output circuit for receiving and outputting various commands from the CPU. The setting control of the hot air temperature by the hot air control device 38 is executed as follows. That is, until the moisture sensor 28 detects the moisture during the circulation of the grains spread into the dryer 2 after the start of drying and calculates the average value, the initial detected moisture value It is set by the detected outside air temperature detected by the outside air temperature sensor 36 and the type of the stuffed grain and the operation position of the stuffing amount, and after the average moisture value of the whole stuffed grain is calculated,
As shown in FIG. 2 and FIG. 3, the hot air temperature control line set by the section of the intruded grain amount, the detected moisture section, and the detected outside temperature section is stored in the CPU 42 in advance, and the detected outside air temperature, Control is performed so as to follow the hot-air temperature control line that has been set and stored, based on the detected moisture content and the amount of inlaid grain.

For example, in the case of a machine capable of drying a grain of a maximum of 3600 kg, when the detected moisture is 25% or more and the amount of stuffed grain is 1800 kg or more, the set hot air temperature is controlled so as not to rise to 35 ° C. or more. Detected moisture 20
When the grain size is 2400 kg or more at ~ 25%,
The set hot air temperature is controlled so as not to rise to 40 ° C. or higher.
In the above case, the set hot air temperature is controlled so as not to rise to 45 ° C. or higher.

The hot air temperature may be changed in accordance with the outside air temperature category. In the above example, the hot air temperature control line for the detected outside air temperature of 20 to 25 ° C. is shown, but when the detected outside air temperature is 15 to 20 ° C., for example, FIG.
Is configured to be corrected and controlled to a temperature lower by 2 ° C. than the hot air temperature. When the detected outside air temperature rises by 5 ° C. during drying, the set hot air temperature is also corrected by 2 ° C. Similarly, when the detected outside air temperature drops by 5 ° C., the set hot air temperature is corrected by 2 ° C. do it.

Until the moisture sensor 28 detects the moisture during one circulation and calculates the average value, the CPU 42 sets and stores the constant value in the CPU 42 irrespective of the detected outside air temperature, the amount of stuffed grains and the like. The control may be performed at a hot air temperature of 40 ° C., and when the calculation of the average moisture value is completed, the hot air temperature is set in accordance with the detected outside air temperature, the detected average moisture value, the amount of stuffed grains, and the like as described above. Alternatively, the configuration may be such that the hot air temperature is controlled to this set value.

[0015] On the other hand, according to FIG.
When the moisture classification is 25% or more, the set hot air temperature is 35 ° C. (point A in FIG. 2), drying proceeds, and the detected moisture is 20 to
When the temperature falls within the range of 25%, the set hot air temperature is increased to 40 ° C. (tie point B), and further drying proceeds to reduce the detected moisture to 20%.
When it becomes below, the set hot air temperature becomes 45 ° C (tie point C),
As described above, the set hot air temperature is gradually changed to the rising side as the detected moisture decreases. Therefore, under high moisture conditions at the beginning of drying, the moisture transfer between grains is severe, so that the temperature of the hot air is lowered. Therefore, drying can be performed while suppressing the moisture transfer, and quality deterioration does not occur. As the drying proceeds and the detected moisture becomes lower, the set hot air temperature gradually rises, so that the drying can be performed under the condition that the quality deterioration is small.

The above set hot air temperature and the hot air temperature sensor 1
The detected hot air temperature detected by the fuel valve 2 is compared with the detected hot air temperature, and if they are different, the amount of fuel sucked by the fuel valve and the fuel pump 19 is controlled so that the temperature becomes the same as the set hot air temperature. When the moisture sensor 28 detects the same grain moisture as the finishing target moisture set by operating the moisture setting knob 34, the drying control by the drying control device 37 is performed by stopping the dryer 2 automatically. It is a configuration to do.

The operation of the above embodiment will be described. For example, grain processing capacity at least 1000 kg, maximum 3800 k
g setting knobs 32, 3 of the operating device 14 of the grain dryer 2
The dryer 2, the burner 1, the moisture sensor 28, and the like are started by operating the switches 3 and 34 to predetermined positions and operating the start switch 30 for starting the drying operation. The hot air temperature generated from the burner 1 is set again by operating the setting knobs 32 and 33. For example, the detected average moisture content is 22%, the detected outside air temperature is 23 ° C., the type of the stuffed grain is rice grain, the operation position of the grain type setting knob 32 is the position of the rice grain, and If the amount of stuffed kernels is 2800 kg and the operation position of the stuffing amount setting knob 33 is the position of 28, the hot air temperature is set to 40 ° C.

When the filling amount is 3200 kg and the moisture content is 25% or more, the set hot air temperature is set to 35 ° C. (point A in FIG. 2), and the drying proceeds and the detected moisture is 20 to 2 ° C.
In the range of 5%, the set hot air temperature is increased to 40 ° C. (tie point B). When the drying is further advanced and the detected moisture becomes 20% or less, the set hot air temperature becomes 45 ° C. (tie point C). The set hot air temperature gradually changes to the rising side as the water content decreases. Therefore, under high moisture conditions at the beginning of drying, the moisture transfer between grains is severe, so that the temperature of the hot air is lowered. Therefore, drying can be performed while suppressing the moisture transfer, and quality deterioration does not occur. As the drying proceeds and the detected moisture becomes lower, the set hot air temperature gradually rises, so that the drying can be performed under the condition that the quality deterioration is small.

[Brief description of the drawings]

FIG. 1 is a block diagram

FIG. 2 is a graph showing the relationship between the amount of grain, grain moisture, outside air temperature, and hot air temperature.

FIG. 3 is a diagram showing the relationship between the amount of grain, the grain moisture, the outside air temperature, and the hot air temperature.

FIG. 4 is an overall side view of a partially breakable dryer.

FIG. 5 is a sectional view taken along line AA of FIG. 4;

FIG. 6 is a partially broken front view of the grain dryer.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Burner 3 Drying room 38 Hot air control device

Claims (1)

[Claims] 1. A method for drying a grain dryer, comprising: setting a hot air temperature to be low or high in advance based on a high or low detected moisture value; and providing a hot air control device for maintaining the hot air temperature and performing drying. Control device.