JPS60188788A - Method of drying cereal grain and controller for temperatureof hot air in cereal grain drier - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides the following advantages:
When the hot air generated by the hot air generator is sent to dry the grains placed in the niJ grain yard, the temperature of the hot air is controlled to a desired flow rate by automatic control of the operation of the hot air generator. The present invention relates to a grain drying method for drying grains, and improvements to a hot air flow rate control device for a grain dryer used to carry out the method.

When drying grains using a grain dryer, the temperature of the hot air sent 7JL to the grains placed in the grain tank is maintained at the desired set temperature (im usually about 40 degrees Celsius). However, in the past, the set temperature at which the hot air should be heated was determined based on the outside temperature and the amount of grain put into the grain tank, and the set temperature was , produced in a hot air generator and turned into grains.

The temperature of the hot air generator is compared with the temperature of the hot air being fed, and when the hot air temperature is higher than the set temperature, the operation of the hot air generator is reduced, and when it is lower than the set temperature, the operation of the hot air generator is increased. This is done by controlling the operation.

As shown in Figs. 1 and 2, the grain dryer A removes the grains loaded into the grain tank (1) through a rotating shutter (10). /
hair [1]), gKiua, obscene conveyor (13
The hot air generated by the hot air generator (2) is circulated by the operation of the hot air generator (2), and the hot air is passed through the hot air supply path (2
01 to the grain flow path (1a) at the bottom of the grain tank (1)
and flow into the exhaust passage 121),
A hot air generator (21
More specifically, in the case where the hot air generated by the hot air is supplied through the hot air supply path (20)
A hot air temperature sensor a is installed to detect the temperature of the hot air generated and fed by the hot air generator (2), and a third As shown in the figure, the reference set temperature is
The outside temperature signal sent from the outside air temperature sensor S1 and the grain amount signal sent from the grain level sensor S2 which detects the grain shards placed in the grain tank (1) are converted into a mathematical expression and stored in a memory circuit. A set temperature calculation circuit is provided, which calculates and sets the set temperature from the table incorporated in the set temperature calculation circuit, and the set temperature signal output from this set temperature calculation circuit and the hot air sent from the hot air temperature sensor An automatic temperature adjustment circuit C is provided which compares the humidity signal with a comparison circuit and outputs the result.
Furthermore, a control circuit d is provided to control the operation of the hot air generation device (2) according to the signal output from the automatic temperature adjustment circuit C, and the hot air temperature sensed by the hot air flow rate sensor aK is adjusted to the set temperature. When the temperature is higher than the set temperature set by the arithmetic circuit, the automatic temperature adjustment circuit C outputs a signal to the control circuit d to suppress the operation of the hot air generator (2) (squeeze the fuel if it is a burner), and By outputting a signal that increases the operation when the humidity is lower than the humidity, the hot air sent to the grains is maintained at the set temperature.

By the way, when drying grains by this conventional means, the set temperature set by the set temperature calculation circuit is
If the outside temperature is constant and the amount of grain loaded in the grain tank (1) does not change, the temperature will be constant, that is, it will be fixed. The temperature is controlled at a substantially constant temperature according to the above-mentioned fixed temperature setting until the entire drying process is completed until the grains loaded in the grain tank (1) reach a predetermined moisture content. There is a problem that the drying speed becomes faster as the drying progresses, and the quality of the dried grains deteriorates.

The present invention has been made to solve this problem.

As a practical problem, when hot air is sent to dry the grains loaded in the grain tank (1) of the grain dryer A, the grains loaded in the grain tank (1) are removed by a combine harvester, for example. In the early stages of the drying process when rice grains contain a large amount of moisture, such as those that have just been harvested, supplying hot air at a relatively high temperature will not affect the quality of the dried grains. Rather, it is considered desirable to do so in order to improve drying efficiency. This means that it is not necessarily necessary to maintain the humidity of the hot air to be sent at a constant temperature, and for this reason, when the drying loss rate becomes high during the drying process, the hot air generator The above-mentioned problem can be solved by controlling the hot air temperature so that the drying rate is kept approximately constant by suppressing the operation of the hot air and lowering the hot air temperature.

Therefore, in the present invention, the operation of the hot air generating device that generates the hot air to be sent to the grain loaded in the grain tank of the grain dryer is controlled during the drying process when the grain dryer is drying. The present invention proposes a means for drying grains according to a drying rate of approximately -r by controlling the drying rate of the grains and then controlling the temperature of the hot air. In this case, as a countermeasure against excessive heat being supplied at the end of the drying process when drying becomes difficult to proceed, the operation of the hot air generation device is controlled according to the drying loss rate to reduce the hot air temperature. When drying grains by varying the drying loss rate during the drying process, the temperature of the fluctuating hot air is maintained at the desired upper limit wetness level (L I, This is to suggest a means to keep it in place.

Next, embodiments will be described in detail with reference to the drawings. Note that the same reference numerals in the drawings are used for the same constituent parts as in the previous means.

In Fig. 4, e is a moisture meter installed in the grain dryer body to measure the moisture content of grain during the drying process, and the internal pressure of the grain tank (1) of grain dryer A is This is a conventionally known method that is installed at appropriate locations in the four circulation paths where grains circulate and flow, samples the grains from the circulation path, detects the moisture value, and outputs the detection results as a signal. Output is performed at intervals of approximately 5 to 10 minutes.

f is a drying rate calculation circuit that calculates the drying rate [%/h] based on the moisture value signal outputted from the moisture meter e after a predetermined time; It is installed in a control box (4) installed in the aircraft. The drying loss rate calculation circuit f includes a memory circuit that stores the moisture value signal sent from the moisture meter e, and a previous moisture value stored in the memory circuit and a new iCMfJ that records the moisture value from the moisture meter e. It is equipped with a circuit that calculates the drying loss rate from the sent moisture value, and outputs the calculated drying loss rate as an output signal.

g compares the drying rate sent from the drying rate calculating circuit f at predetermined time intervals with a standard drying rate set as desired in advance, and outputs a comparison result of high and low, and thereby An automatic temperature adjustment circuit that controls the operation of the generator (2),
A memory circuit for storing a drying rate of a standard set in advance, and a drying rate of the standard stored in the memory circuit and a drying rate sent from the drying rate calculation circuit f. and outputs the results as three types of signals: plus, zero, and minus.

h is a control circuit that controls the operation of the hot air generation device (2) based on the output signal sent from the automatic temperature adjustment circuit g; when the hot air generation device (2) is a burner device,
A is a hot air temperature sensor installed in the hot air supply path I20 of the grain dryer A. , detects the temperature of the hot air sent from the hot air generator (2) and outputs a signal indicating the hot air temperature.

1 is a 10-limit temperature setting circuit that regulates the 10-limit temperature of the hot air, and includes a memory circuit that stores the upper limit temperature to be set as desired, and the temperature of the hot air sent from the hot air temperature sensor a and the upper limit temperature. When the temperature of the hot air sent from the hot air flow rate sensor a is higher than the set second limit temperature, the result is sent to the hot air generator (2).
The control circuit hK feeds the hot air generator (
2) acts to suppress the operation to increase the output.

Next, to explain the function and effect, in the means of the present invention configured as described above, hot air generation is performed to generate hot air to be sent to the grains stretched in the grain tank (1) of grain drying + lA. By controlling the operation of the device (2) according to the drying loss rate of the grains during the drying process in the grain dryer A and varying the hot air flow rate, the grains are kept at a substantially constant rate. Traditionally, drying is done by maintaining the drying loss rate.
Hot air generator @ so that the hot air temperature is maintained at 1'jJl
(2) When the operation of (2) was controlled to dry the grains, the quality of the drying grains increased as the drying rate increased as the process of ■ progressed. The problems that were making things worse will now be effectively resolved.

In addition, as mentioned above, when drying grains while maintaining a substantially constant drying loss rate, the upper limit of the hot air temperature is regulated, and when the hot air temperature reaches the upper limit temperature, the drying loss rate becomes lower than the standard drying loss rate. Even when the drying rate is lower than the drying rate, the operation of the hot air generator (2) is not controlled to increase, and drying is continued at a low drying rate. At the end of the process, when drying is in a state where it is difficult to proceed, the interlayer I, in which hot air at a high temperature is supplied, can be effectively eliminated.

[Brief explanation of drawings]

Fig. 1 is a joint-cut iE view of the grain dryer, Fig. 2 is a vertical sectional side view of the same as above, Fig. 3 is an explanatory view of the slave AiJ means, and Fig. 4 is an explanatory view of the means of the present invention. Explanation of drawing symbols A: Grain dryer a: Hot air temperature sensor b: Crotch humidity calculation circuit C: Automatic temperature adjustment circuit d: Control circuit e
・・Moisture meter f・・Drying loss rate calculation circuit g・・Automatic temperature adjustment circuit h・・
Control circuit I/10-limit temperature setting circuit 1...Grain tank 1. a
...Flow 'F path 10...Shutter J1...Conveyor for discharging 2...Elevator 13...Conveyor for tensioning 3...Blower 2...Hot air generator λ]...Hot air supply Route 4: Control box Sl: Outside temperature sensor S2: Grain level sensor Figure 2 Figure 1 Figure 8

Claims (1)

[Scope of Claims] 111 Temperature control of hot air generated by a hot air generation device and fed to the grains injected into the grain vat can be controlled by controlling the temperature of the hot air by sampling and detecting the grains during the drying process. I4: A method for drying grains, characterized in that the operation of a drying device is controlled and the grains are dried while maintaining the drying rate at approximately -. (2) The temperature of the hot air generated by the hot air generator and sent to the grains placed in the grain tank is controlled by the drying rate detected by sampling the grains during the drying process. In a drying method in which grains are dried while being controlled to maintain a substantially constant drying loss rate, the operation of the hot air generator is controlled so that the hot air flow rate is set to a desired value.
A method for drying grains, characterized by drying the grains by controlling the temperature to be below a temperature limit. (3) The control circuit for the operation of the hot air generation device that generates hot air to be sent to the grains placed in the grain vat is connected to a moisture meter that detects the moisture value of the grains during the drying process and the moisture meter. A drying rate calculation circuit that calculates the drying rate from the moisture value output after a predetermined period of time, and a drying rate signal output from the drying rate calculation circuit and a storage circuit that sets the desired value and stores it. A control device for hot air temperature in a grain dryer, characterized in that the temperature is controlled according to the drying rate by an automatic temperature adjustment circuit that compares the drying rate with a standard drying rate and outputs the comparison result.