JPS60181579A - Method of drying cereal - 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 maintains the reference hot air temperature set at the start of drying in the initial stage of drying, and then controls the reference hot air temperature to vary within a certain temperature range to dry at a set drying loss rate. This invention relates to a grain drying method in which the temperature of the hot air is returned to the initial reference temperature at the end of drying.

A grain drying method that performs so-called drying loss rate control, in which hot air temperature is corrected and controlled so that the moisture value of the grain to be dried during drying approaches a preset moisture value, was previously proposed by the applicant in Japanese Patent Application No. 1983. It was developed as described in No.-213193.

By the way, according to the above-mentioned grain drying method, the moisture value of the grain to be dried is dried according to a preset standard moisture value under favorable conditions, so it is not possible to change the outside temperature during drying. However, during the final moisture measurement at the end of the drying period,
If a high moisture content that is far away from the set moisture value happens to be measured, the hot air temperature will be controlled to a fairly high value, and conversely, if a low moisture content is measured, the hot air temperature will be controlled to a fairly low value. In the former case, the time required to finish drying is too fast, and in the latter case, the time is too long, which may reduce drying efficiency.

Therefore, the present invention improves the above-mentioned grain drying method, so that the time required to finish drying at the end of drying can be maintained at an appropriate level, and drying can be completed efficiently and without deterioration of quality. The object is to provide a grain drying method.

In view of the foregoing, in order to achieve the above object, the present invention particularly provides a method using a standard temperature f set at the beginning of drying.
＠Dry while maintaining the hot water temperature, then heat air temperature at a preset temperature range according to the difference between the measured moisture value and the preset reference moisture value per drying time until the moisture value is slightly higher than the finished drying moisture value. After drying by controlling the drying temperature, the grain drying method is characterized in that the initial standard hot air temperature is maintained again to dry the grain to the finished moisture value, and according to this method, the moisture value at the final stage of drying is Regardless of the measurement results, the time until drying can be maintained appropriately, and high-quality dried grains can always be obtained efficiently and without causing cracks or the like.

The grain drying method according to the present invention and the apparatus for carrying out the method will be explained below.

In FIG. 1, 1 is a hot air temperature detector, 2 is a reference hot air temperature setting circuit, 3 is a temperature comparison circuit, 4 is a moisture measuring device, 5 is a reference moisture value setting circuit, and 6 is a moisture comparison circuit. The output of the moisture comparison circuit 6 is input to the control pattern switching circuit 7 and sent to the temperature comparison circuit to correct the set value of the hot air temperature. 8 is a hot air temperature control circuit, and 9 is a fuel supply pump. The hot air temperature control circuit 8 receives the corrected control signal from the temperature comparison circuit 3 and controls the fuel supply pump 9.

The reference hot air temperature setting circuit 2 is for setting a reference hot air temperature at the initial stage of drying, and the reference moisture value setting circuit 5 is for setting a reference moisture value in advance. In addition, the control pattern switching circuit 7 does not send its input to the temperature comparison circuit 3 from the start of drying to the start of drying loss rate control, and after that, the measured moisture value approaches a constant value (for example, 16%) that approaches the dry finish moisture value.
The input is not sent to the temperature comparison circuit 3 until reaching the final moisture value (for example, 15%), and the input is not sent to the temperature comparison circuit 3 again until the finished moisture value (for example, 15%) is reached.

Next, its effect will be explained.

Now, when loading the grain to be dried in the dryer and starting the drying work, determine the standard hot air temperature by correcting the amount of grain to be loaded and the outside temperature, etc., and set the standard hot air temperature in the standard hot air temperature setting circuit 2. do.

Then, the drying operation starts. Then, the heat am degree during drying is detected by the hot air temperature detector 1, the hot air temperature during drying is input to the temperature comparison circuit 3, and based on the output, the hot air temperature control circuit 8 is operated to maintain the reference hot air temperature. controls the fuel supply pump 9. During this time, the input from the control pattern circuit 7 to the temperature comparison circuit 3 is cut off. Then, the moisture content of the grain to be dried is determined at a moisture value (for example, 2
2%), the control pattern switching circuit 7 and the temperature comparison circuit 3 are connected and switched, so that the moisture value measured by the moisture measuring device 4 at fixed time intervals (for example, 1 hour) during drying is transferred to the moisture comparison circuit 6. The fuel supply pump 9 is controlled by the hot air temperature control circuit 8 so that the hot air temperature is corrected within a preset temperature range in order to bring it closer to the reference moisture value.

For example, the measured moisture value is ±0.1% to ±± of the standard moisture value.
ti ±5 a(, ±0.5% ~: i
=1. Temperature correction of ±10°C is performed in the oO% range.

In this way, the drying progresses, and when the moisture value reaches the final stage of drying (for example, the moisture content of the grain to be dried is 16%) and the moisture value is measured by the moisture measuring device 4, which is slightly higher than the dry finish value, the control pattern switching circuit 1 and the temperature comparison circuit 3 is shut off, and the drying is carried out while maintaining the reference hot air temperature at the initial stage of drying until the finished moisture value (for example, 15%) is measured.

Then, when the finished moisture value (for example, 15%) is reached, drying is automatically terminated (see FIG. 2 above).

As mentioned above, at the end of drying, regardless of the moisture content measured by the moisture meter 4, the standard hot air temperature set at the beginning of drying is maintained and the drying reaches the finished moisture value, so until the end of drying. The control time is never too long or too short, and the process is always efficient.
Furthermore, high-quality dried grains can be obtained without cracking or the like.

[Brief explanation of the drawing]

The drawing is a block diagram of an apparatus for implementing the grain drying method according to the present invention, and FIG. 2 is an explanatory diagram of its operation. DESCRIPTION OF SYMBOLS 1... Hot air temperature detector, 2... Reference hot air temperature setting circuit, 3... Temperature comparison circuit, 4... Moisture measuring device, 5...
・・Reference moisture setting circuit, 6−・・Moisture comparison circuit, 7・・
・Control pattern switching circuit, 8...Hot air temperature control circuit,
9...Fuel supply pump patent applicant Kaneko Agricultural Machinery Co., Ltd. Figure 1 Figure 2 -31 Car 4 (R1 I L% O measurement tree compensation % +-++ N round trench @C Procedure amendment (Method) % formula % 1. Indication of the case Japanese Patent Application No. 59-36326 2. Name of the invention Grain drying method 3. Person making the amendment Relationship to the case Patent applicant 2-21-10 Nishi, Hanyu City, Saitama Prefecture No. (146) Kaneko Agricultural Machinery Co., Ltd. Representative Aiji Kaneko 4, Agent 〒201 6. "Brief description of drawings column" in the specification subject to amendment 7. Contents of amendment (11 Specification No. 6 In line 19 of the page, the phrase ``The drawing is'' has been corrected to ``Figure 1 is''.

Claims (1)

[Claims] In the initial stage of drying, the standard hot air temperature set at the start of drying is maintained, and then until the moisture value is slightly higher than the finished drying moisture value, the temperature range is set in advance according to the difference between the measured moisture value and the preset moisture value. After drying by controlling the hot air temperature,
A grain drying method characterized by drying to a finishing moisture value while maintaining the initial standard hot air temperature again.