JPH0735949B2 - Drying control device in grain dryer - Google Patents

Description

TECHNICAL FIELD The present invention relates to an improvement of a grain dryer that dries grains while circulating them inside the machine.

(Prior Art) When drying harvested kernels with this type of equipment,
After the grains are put in the storage chamber, the grains are introduced into a drying chamber to be dried, and then the grains are circulated for drying again such as returning to the storage chamber.

During drying, the moisture content of the grain is measured with a moisture meter. However, as a moisture meter that measures the moisture content of each grain, for example, only those within the effective range determined in advance from the measurement data are effective. It is taken in as data, and a plurality of valid data taken in is averaged to calculate an average moisture value.

Then, the rate of change of the average water content per unit time (hereinafter referred to as the dry loss rate) is detected, and the hot air temperature from the dry heat source is adjusted so that the detected dry loss rate becomes a predetermined standard dry loss rate. Is increased or decreased to perform the drying control, and when the average moisture value reaches the target moisture value, the drying operation is automatically stopped.

(Problems to be Solved by the Invention) By the way, when the effective range width set to calculate the average moisture value is reduced as described above, the measurement data concerning high moisture grains such as immature rice is not captured. The excluded average moisture value is calculated.

Therefore, when the dry stop control is performed based on the average moisture value, the stop accuracy is good because the measurement data relating to the high moisture grain is excluded.

However, when the drying loss rate control is performed based on the average moisture value, even though the high moisture grain is being dried, it is not considered at all, so the drying loss rate control is extremely inappropriate. Becomes

On the other hand, when the effective range width is increased, contrary to the above, the average moisture value in which the measurement data concerning the high-moisture grain is taken in is calculated.

Therefore, when the drying loss rate control is performed based on the average moisture value, the drying loss rate control becomes extremely appropriate in consideration of the dry state of high moisture grains such as unripe rice. However, when the drying stop control is performed based on the average moisture value, the measurement data for the high-moisture grain is captured, so that the stopping precision is reduced, which is preferable.

These inconveniences are not so serious when the mixing ratio of high-moisture grains such as immature rice is low, but become a serious problem when the mixing ratio of high-moisture grains is high.

However, conventionally, both of the drying loss rate control and the drying stop control are controlled by a single average moisture value, so that these problems cannot be dealt with.

In view of these points described above, the present invention obtains two moisture values under different conditions, performs the drying loss rate control with one moisture value, and performs the drying stop control with the other moisture value, and the accuracy of both controls is controlled. The purpose is to improve.

(Means for Solving the Problems) In order to achieve such an object, the present invention provides a moisture meter 20 for measuring the moisture value of grains during drying with time, and a moisture value measured by the moisture meter. First selecting means A for selecting the moisture value as valid data when the moisture value is within a predetermined first effective range, and the moisture value measured by the moisture meter 20 is equal to or lower than the upper limit value of the first effective range. When within the second effective range of the narrow effective width equal to or more than the lower limit value, the average value of the effective data selected by the second selecting means B for selecting the moisture value as the effective data and the first selecting means A is calculated. A first moisture value calculating means C for calculating a first moisture value, and a second moisture value calculating means D for averaging the valid data selected by the second selecting means B to calculate a second moisture value. , The time of the first moisture value calculated by the first moisture value calculating means C The drying loss rate is detected by the change, and the drying loss rate control unit E controls the drive of the dry heat source F so that the detected drying loss rate becomes the reference drying loss rate, and the second moisture content calculating unit D calculates. And a stop command means G for stopping the driving of the dry heat source F when the second moisture value matches the target moisture value.

(Operation) That is, according to the present invention, as shown in FIG. 1, the first moisture value calculating means C obtains the first moisture value in consideration of high moisture grains such as unripe rice, and the second moisture value calculation. The means D obtains a second moisture value that does not consider high-moisture grains such as immature rice, and the drying loss rate control means E controls the drying heat source F by the first moisture value, and The stop command means G controls the dry heat source F to stop depending on the second moisture value.

Embodiments Embodiments of the present invention will be described below with reference to the drawings.

FIG. 2 is a schematic cross-sectional view of a grain dryer in which the present invention is implemented. Reference numeral 1 is a storage chamber of the dryer. Then, it is attached with an inclination, and a grain chamber 3 is formed by each grain plate 2.

Two mesh plates 4 as perforated plates are connected in parallel to each lower side of the shedding board 2, and a drying chamber 5 is formed between them. And
A hot air chamber 6 in which a burner 10 as a dry heat source is installed is formed between two inner mesh plates provided near the center of the storage chamber 1, and two outer mesh plates 4, 4 and left and right machine walls 7 are formed. Between the ventilation chamber 8
And the exhaust fan 9 in the exhaust chamber 8 is connected.

Reference numeral 11 is a gutter-shaped grain-collecting chamber, in which a transverse feeding helix 12 is installed at the bottom thereof, and the terminal end thereof is connected to the lower entrance of the elevator 13. A rotary valve 14 is axially 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 to the grain collecting chamber 11 via the drying chamber 5.

The upper outlet of the elevator 13 is connected to the grain feeding spiral 15 installed on the ceiling of the storage chamber 1, and the outlet of this grain feeding spiral 21 is connected to the storage chamber 1.
Peek into.

Reference numeral 21 denotes an outside air temperature sensor attached to the machine wall 7 for measuring the outside air temperature, and 22 denotes an outside air humidity sensor attached to the machine wall 7 for measuring the outside air humidity. Further, 20 is a moisture meter for measuring the moisture content of each dried medium grain, which is installed in the shed chamber 3.

Reference numeral 23 is a grain temperature sensor installed in the shed chamber 3, 24 is an exhaust air temperature sensor installed in the air exhaust chamber 8, and 25 is a hot air temperature sensor installed in the hot air chamber 6. Further, 26 is a fuel pump for supplying fuel to the burner 10, and 27 is a fuel valve for adjusting the fuel to be supplied to the burner 10.

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

In the figure, reference numeral 30 is a CPU (central processing unit) in the form of a microprocessor, which makes various judgments as shown in FIG. 4, for example, and controls each component as described later.

Reference numeral 31 is an operation input setting device provided with, for example, a dry button, a stretch button, a discharge button, a stop button, etc.
Connect to CPU 30 via 32. Further, the moisture meter 20 and each of the sensors 21 to 25 are connected to the CPU 30 via the A / D converter 33.

Reference numeral 34 denotes a display unit connected to the CPU 30 via the output circuit 35. The display unit 34 not only performs various displays but also displays the second average moisture value M2 as described later.

36 is a memory composed of a read-only memory (ROM) that stores control procedures for the CPU 30 to control each constituent element, 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. The output circuit 37 includes a transport motor 40, a heater 41, and a moisture meter motor 42.
, The fan motor 43 is connected to the output circuit 38, and the fuel pump 26 is connected to the output circuit 39.

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

When the drying is started, the grains stretched in the storage chamber 1 are guided to the drying chamber 5 and dried, and then returned to the storage chamber 1 via the elevator 13 and the like to be conditioned.

Then, as shown in step S1 of FIG. 4, when the drying control according to the present invention is started, the measurement data of one grain is read from the moisture meter 20 in step S2.

In step S3, it is determined whether the measurement data is within the first effective range. The first effective range is, for example, a predetermined effective width set in the vertical direction with respect to the previous average water content value M1 of the grain obtained as described below.

Then, when an affirmative determination is made in step S3, the process proceeds to step S4, the measured data is stored as the first valid data, and further it is determined in step S5 whether the measured data is within the second valid range. The second effective range is, for example, a predetermined effective width set in the vertical direction with respect to the previous average water content value M2 of the grain obtained as described below. Here, the second effective range is set to a narrow effective width that is equal to or less than the upper limit value of the first effective range and is equal to or more than the lower limit value thereof.

If an affirmative decision is made in step S5, the operation proceeds to step S6, in which the measured data is stored as second effective data,
If it is determined in S7 that the first valid data and the second valid data have been stored in predetermined numbers, the process proceeds to the next step S8.

In step S8, a predetermined number of first valid data stored in step S4 are averaged to calculate a first average moisture value M1. Further, in step S9, a predetermined number of second effective data stored in step S6 are averaged to calculate a second average moisture value M2.

The first average moisture value M1 calculated in this way is applied to high moisture grains such as immature rice because the first effective range, which is the processing condition, is set wider than the effective width of the second effective range. The measured data is taken into consideration. On the other hand, the second average moisture value M2 is set so that the second effective range, which is the processing condition thereof, is narrower than the first effective range, so that the measurement data relating to high moisture grains such as unripe rice are excluded. Will be things.

Next, in step S10, the first average moisture value M1 calculated in step S8 and the second average moisture value calculated in step S9.
Based on M2, each effective range used in steps S3 and S5 next time is changed.

In step S11, it is determined whether or not the drying loss rate control is performed, and if the determination is affirmative, the process proceeds to step S12, and based on the first average moisture value M1 considering high moisture grains such as unripe rice calculated in step S8, a predetermined The drying rate is controlled. That is, the drying loss rate is detected from the first average moisture value M1, and the combustion amount of the burner 10 which is the dry heat source is controlled so that the detected drying loss rate becomes the reference drying loss rate.

On the other hand, if a negative determination is made in step S11, the process proceeds to step S13, and the second average moisture value M2 calculated in step S9 that does not consider high moisture grains such as unripe rice is compared with the target moisture value M.
When the second average moisture value M2 is equal to or less than the target moisture value M, the burner is stopped and the drying is stopped in step S14.

Further, in this embodiment, the second average moisture value M2 is displayed on the display unit 34 during the drying. Therefore, the operator can easily grasp the accurate moisture value of the grain during drying.

In the present embodiment, the first average water content value M1 and the second average water content value M2 are calculated separately under different processing conditions, but instead of this, the first average water content value M1 is calculated. After the calculation, if the first average water content value is multiplied by a predetermined constant to calculate the second average water content value, the calculation process becomes relatively easy.

(Effects of the Invention) As described above, according to the present invention, two moisture values are calculated by incorporating measurement data of a moisture meter under different conditions, and are calculated in consideration of high moisture grains such as unripe rice. The drying rate is controlled by the moisture value, while the drying stop control is performed by the moisture value calculated without considering high-moisture grains such as immature rice. When the mixture ratio of is large, the control is extremely appropriate.

[Brief description of drawings]

FIG. 1 is a functional diagram of the present invention, FIG. 2 is a schematic configuration diagram of an embodiment of the present invention, FIG. 3 is a block diagram of its control system, and FIG. 4 is a flow chart showing its operation example. A is the first selection means, B is the second selection means, C is the first moisture value calculation means, D is the second moisture value calculation means, E is the drying loss rate control means, F is the dry heat source, and G is the stop command means. , 20 is a moisture meter.

Claims (1)

[Claims] 1. A moisture meter for measuring a moisture value of a grain during drying with time, and a moisture value measured by the moisture meter is effective when the moisture value is within a predetermined first effective range. First selecting means for selecting as data, and when the moisture value measured by the moisture meter is within a second effective range with a narrow effective width that is equal to or lower than the upper limit value of the first effective range and is equal to or higher than the lower limit value thereof Second selecting means for selecting a value as valid data; first moisture value calculating means for averaging the valid data selected by the first selecting means to calculate a first moisture value; and second selecting means. Second moisture value calculating means for averaging the selected valid data and calculating a second moisture value, and a drying loss rate detected by a temporal change of the first moisture value calculated by the first moisture value calculating means. The dry heat source so that the detected drying loss rate becomes the reference drying loss rate. A drying loss rate control means for controlling the driving, and a stop command means for stopping the driving of the dry heat source when the second moisture value calculated by the second moisture value calculating means becomes equal to or less than the target moisture value. Drying control device in the grain dryer.