JPS63172884A - Moisture meter controller 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 (Field of Industrial Application) The present invention relates to a grain dryer that dries grain without circulating the inside of the machine, and particularly relates to an improvement of a moisture meter control device thereof.

(Conventional technology) Grain drying MI! When drying grains in a machine, the grains are placed in a storage chamber, then led to a drying chamber for drying, and then returned to the storage chamber, thus drying while circulating the grains. The drying operation is generally configured to end when a preset time by a drying timer is reached.

By the way, when the drying operation is finished, if the moisture content of the grains does not reach the expected finishing value, the dryer is operated again to perform additional drying (hereinafter, such drying is referred to as additional drying). , to dry the grain to the target moisture value.

(Problems to be Solved by the Invention) However, when performing additional drying, conventionally only the normal drying mode could be used. In other words, in the case of additional drying, the moisture meter is operated in the same way as in the initial stage of normal drying to calculate the moisture value of the grain, so it takes a considerable amount of time to calculate the moisture value in the initial stage of additional drying. It required

Therefore, the moisture content of the grains often exceeded the target value during the measurement period, resulting in overdrying. This overdrying is particularly noticeable when a single-grain moisture meter is used, and a solution to this problem has been desired.

Therefore, an object of the present invention is to provide a fact that during additional drying, as the moisture value approaches the target moisture value, the moisture value of the grains in the machine is averaged, and moisture unevenness is eliminated, so that the accuracy of calculating the moisture value is not adversely affected. The initial moisture value should be calculated in a short time by focusing on the following.

This is to prevent overdrying.

(Means for Solving the Problems) In order to achieve the above problems, the present invention provides an additional drying determination means A that determines whether or not additional drying is to be performed at the time of starting drying of grains; and the additional drying determination means. When additional drying is determined by means A,
Measurement number setting means B for setting the number of measurements of the moisture meter 20 for measuring the moisture content of grains to be smaller than the initial measurement in normal drying.

It consists of a moisture value calculation means C that drives the moisture meter 20 according to the number of measurements set by the measurement frequency setting means B and calculates a moisture value from the measured value of the moisture meter 20.

(Function) In the present invention, when the operator presses, for example, an additional drying button to perform additional drying, the additional drying determination means A determines that additional drying is to be performed at the time of starting drying.

Thereby, the measurement number setting means B sets the number of measurements of the moisture meter 20 to be half of the initial measurement in normal drying, which is smaller than the number of measurements in normal drying.

The moisture value calculation means C drives the moisture meter 20 according to the set number of measurements, and calculates the moisture value from the measured value of the moisture meter 20 according to a predetermined procedure.

With such an operation, when additional drying is performed, the initial moisture value can be calculated in a short time, and the target moisture value can be determined at an early stage, thereby making it possible to prevent overdrying.

(Example) Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 2 is a schematic cross-sectional view of a grain dryer embodying the present invention. In FIG. Installed at an angle so as to make the grain narrower, each flow grain plate 2 creates a flow grain room 3.
form.

Two mesh plates 4 are connected in parallel to each lower side of the floating grain plate 2,
A drying chamber 5 is formed between them. A hot air chamber 6 in which a burner 10 is installed is formed between the two inner mesh plates 4 provided near the center of the storage chamber l, and the two outer mesh plates 4.4 and the left and right machine walls 7. An exhaust chamber 8 is formed between the exhaust chamber 8 and the suction fan 9 of the exhaust chamber 8.

Reference numeral 11 denotes a grain collection room formed in the shape of a gutter, and a lower helix 12 is installed at the bottom of the grain collection room, the end of which is connected to the lower entrance of the elevator 13. Reference numeral 14 denotes a rotary valve pivotally supported at the lower end outlet of the drying chamber 5, and its rotation causes the grains in the storage chamber 1 to flow out through the drying chamber 5 into the grain collection chamber 11.

The upper outlet of the elevator 13 is connected to an upper helix 15 installed on the ceiling of the storage chamber 1, and the outlet of this upper helix 15 looks into the storage chamber 1.

20 is a moisture meter that measures the moisture content (moisture) per grain of grains during drying, and is installed in the flowing grain room 3. Reference numeral 21 denotes an outside air temperature sensor attached to the aircraft wall 7 to measure the outside air temperature, and 22 an outside air humidity sensor attached to the aircraft wall 7 to measure the outside air humidity.

23 is a grain temperature sensor installed in the grain flow chamber 3 to measure the temperature of the grain; 24 is an exhaust temperature sensor installed in the ventilation chamber 8;
5 is a hot air temperature sensor installed in the hot air chamber 6. Also 26
27 is a fuel pump that supplies fuel to the burner 10;
is a fuel valve that adjusts the fuel supplied to the burner 10.

FIG. 3 is a block diagram showing an example of a control system according to an embodiment of the present invention.

In the figure, 30 is a microprocessor type CPU (
The central processing unit (central processing unit) performs various judgments as shown in FIG. 84, for example, and controls each component as described later.

Reference numeral 31 denotes an operation input setting device in which, for example, a drying button, a tensioning button, an ejection button, a stop button, etc. are arranged, and an additional drying button 31A to be pressed during additional drying according to the present invention is arranged. via CPU30
Connect with. In addition, a moisture meter 20 and each sensor 21 to 2
5 is connected to the CPU 30 via the A/D conversion section 33.

34 is a display section connected to the CPU 30 via an output circuit 35, and this display section 34 performs various displays.

36 is a memory consisting of a read-only memory (ROM) that stores control procedures for the CPU 30 to control each component, and a random access memory (RAM) that temporarily stores various data such as measurement data. It is a device.

37 to 39 are output circuits connected to the CPU 30, respectively, and the output circuit 37 includes a transport motor 40, a heater 41,
A moisture meter motor 42 is connected to each, a fan motor 43 is connected to the output circuit 38, and a fuel pump 26 and a fuel valve 27 are connected to the output circuit 39.

Next, an example of the operation of the embodiment configured as described above will be explained with reference to the flowchart of FIG.

When drying starts, the grains packed in the storage chamber 1 are led to the drying chamber 5 and dried. At the same time, the moisture meter control according to the present invention shown in FIG. 4 is started, and determination as to whether or not the additional drying button 31A has been pressed is started (step S1).

If the additional drying button 31A is not pressed, that is, if the drying button is pressed and it is determined that normal drying has started, the moisture meter 20 sets the number N of grains to be measured for moisture in one measurement to, for example, 32 grains. Set (Step S2)
Further, the number of measurements M for measuring the moisture content in units of 32 grains at predetermined intervals is set to, for example, four times (step S3), and the predetermined measurement interval T is set to, for example, five minutes (step S4).

Based on each of these settings, the moisture meter 20 starts moisture measurement, and after measuring the moisture content of 32 grains one by one in the first measurement, there is an interval of 5 minutes.

Then, after 5 minutes have elapsed, the moisture content of 32 grains is similarly measured in the second measurement with an interval of 5 minutes, and these measurement operations are repeated 4 times and the process ends (step S8).
~5ll), and based on the data obtained from these four measurements, the desired moisture value is calculated from the average value of each data.

In this way, if one measurement value is detected from the average of the measurement values of 32 grains, and this is detected repeatedly four times at the measurement interval T, then 1
The initial moisture measurement value is calculated by averaging the measured values from the fourth measurement to the fourth measurement.

Next, set the measurement interval TO (for example, if the measurement value is 17.5
% or more, To = 14 minutes, if less than 17.5%, TO = 4 minutes) 5th measurement value.

It is determined from the average of 32 grains in the same way as the first to fourth measurements, and a moving average measurement value is calculated from the fifth measurement value and the average of the second to fourth measurement values.

After that, the average of the measured values from the 3rd to the 6th time, 4
The average of the measured values from the 7th to the 7th measurement is
A moving average measurement value at that point is calculated from the average of four pieces of data: the previous measurement value and the current measurement value, and that value is displayed.

At this time, the initially calculated initial moisture measurement value is used as the standard value, and measurement values that exceed the standard value by more than a certain value are cut off as abnormal data to avoid measurement irregularities.

Therefore, in step St, the additional drying button 31A
If it is determined that has been pressed, that is, if additional drying is determined, the number of grains N to be measured by the moisture meter 20 in one measurement is set to, for example, 16 grains (
Step S5), and furthermore, the number of measurements M for measuring the moisture content in units of 16 grains at predetermined intervals is set to, for example, two times (step S6), and the measurement interval T is set to, for example, five minutes (step S7).

Based on each of these settings, the moisture meter 20 performs moisture measurement (steps S8 to 311), and calculates an initial moisture value from the average value of each data based on the data obtained by this measurement (step 512). .

Thereafter, similarly to the above-mentioned normal measurement, a moving average measured value is obtained from the average of the previous two measured values and the measured value of that time.

As described above, in this embodiment, during additional drying, the number of measurements M of the moisture meter is reduced to 1/2 compared to normal drying.
and the number of grains measured per time N t-1/2
The number of grains measured by the moisture meter was significantly reduced overall. Therefore, during additional drying, it is possible to know the moisture value at the initial stage of drying in a short time from the start of drying, and this allows early judgment to be made as to whether or not the target moisture value has been reached, thereby preventing overdrying. can do.

Note that, without providing the additional drying button 31A as in this embodiment, when the moisture value at the time of stopping drying is within 1% of the target moisture value and the drying button is pressed again, the additional drying button 31A is not provided. It may be configured such that it is determined to be dry.

Next, an example of operation in another embodiment of the present invention will be described with reference to the flowchart of FIG.

In this embodiment, when drying of grains is started, the moisture meter control shown in FIG. 5 is started, and the moisture meter 20 measures the initial moisture for the first time (step 521).

Then, it is determined whether the measured moisture value corresponds to "low", "medium" or "high" (step 522), and when the moisture value is "low", the moisture meter 20 performs one moisture measurement. The number of grains n is set to nl, and the measurement interval t from the end of one measurement to the start of the next measurement is set to tl (step 523).

In addition, when the moisture value is "medium", the number of grains n
is set to n2 and the measurement interval t is set to t2 (step 524), and when the moisture value is "high", the number of grains to be measured n is similarly set to n3 and the measurement interval tt-t is set to 3 (step 524). Set (step 525
), and the above-mentioned measured grain an1. n2. The relationship between n3 and measurement intervals t1, t2, and t3 is as shown in the following equation.

t 1 < t 2 < t 3 (1) n l
< n 2 < n 3 (2) Based on each of these settings, the moisture meter 20 starts measuring moisture,
After measuring the moisture content of a set number of grains (for example, 32 grains) one by one in one measurement, after a set interval (for example, 5 minutes), these measurement operations are repeated 4 times and finished ( Steps 326 to 529), and a moisture value is calculated based on the data obtained by these measurements.

As described above, in this example, the moisture value was measured immediately after drying was started, and the number of grains to be measured using the moisture meter and the measurement interval were varied depending on the moisture value. Therefore, when additional drying is performed, that is, when drying has progressed considerably and the moisture value is low, the number of grains measured by the moisture meter and the measurement interval are both set smaller and shorter than in other cases. Since the moisture value is calculated based on time, there is an advantage that the conventional problems such as overdrying caused by additional drying can be prevented.

Note that during additional drying, the initial moisture value can be calculated in a short time even if only one of the two is reduced, without reducing both the number of grains measured by the moisture meter and the measurement interval.

(Effects of the Invention) As described above, the present invention focuses on the fact that when additional drying is performed, the dry finish moisture value (target moisture value) becomes close to the moisture value, and water unevenness disappears, so that the accuracy of calculating the moisture value is not adversely affected. However, due to this fact, we reduced the number of measurements with the moisture meter compared to normal drying and calculated the moisture value at the beginning of drying in a short time, so it is easy to check whether the calculated moisture value has reached the target moisture value. You can make an early decision on whether or not to
This has the effect of preventing overdrying.

[Brief explanation of the drawing]

Fig. 1 is a functional diagram of the present invention, Fig. 2 is a schematic sectional view of a dryer implementing the present invention, Fig. 3 is a block diagram showing its control system, and Fig. 4 is an operational example of an embodiment of the present invention. FIG. 5 is a flowchart showing an example of the operation of another embodiment. A is an additional drying determination means, B is a measurement frequency setting means, C is a moisture value calculating means, 20 is a moisture meter, 30 is a CPU, and 31A is an additional drying button. Patent applicant: Iseki Agricultural Machinery Co., Ltd. Representative: Tobe Maki (and 2 others) Figure 1 Figure 2

Claims (1)

[Scope of Claims] Additional drying determining means for determining whether or not additional drying occurs when drying of grains starts; and when additional drying is determined by the additional drying determining means, moisture content of the grains is measured. A measurement number setting means for setting the number of measurements to be performed by the moisture meter to be smaller than the initial measurement in normal drying; and a moisture meter is driven according to the number of measurements set by the measurement number setting means, and the moisture meter A moisture meter control device for a grain dryer, comprising moisture value calculation means for calculating a moisture value from a measured value.