JPS59109767A - Controller for drying of 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 relates to a drying control device for a grain dryer that dries grains using hot air.

An object of the present invention is to provide a drying control device for a grain dryer that allows grains to be dried in a good manner.

In order to achieve the above object, this invention installs a pressure detection device 2 that detects the pressure of hot air in a hot air chamber 1 that dries grains using hot air generated by a hot air generator, and sets a constant pressure of the hot air. A control device is installed to control the hot air generator so that the pressure detected by the pressure detection device 2 matches the pressure set by the reference pressure setting device 3. .

Hereinafter, one embodiment of the present invention will be described in detail based on the drawings.

Figures 1 to 3 show a dryer that dries grains using hot air, where 7 is a storage chamber for grains to be dried;
9 is an upper transfer spiral for loading grains, and 9 is a dispersing rotor, which is disposed below the discharge port 10 of the upper transfer spiral 8.

Reference numeral 11 denotes a drying chamber that is continuously formed below the storage chamber 7, and is formed by erecting ventilation frames 12 such as wire mesh or perforated iron plates at predetermined intervals.

Reference numeral 13 denotes a grain harvesting chamber formed below the drying chamber 11, the bottom of which is formed in the shape of a gutter, and a lower transfer spiral 14 is installed therein.

1 is a hot air chamber provided between the drying chambers 11 and a burner 1
It is connected to 5.

Reference numeral 16 denotes a ventilation chamber provided outside the drying chamber 11, which is communicated with the suction fan 6. The suction fan 6 is connected to a variable motor 17 whose rotational speed can be changed. The suction fan 6 and the burner 15 constitute a hot air generator.

A rotary valve 18 is rotatably provided in the lower part of the drying chamber 11, and is configured to slowly feed the grains into the grain harvesting chamber 13.

19 is a lever, whose lower end is communicated with the lower transfer spiral 14 and whose upper end is connected to the upper transfer spiral 8 via the supply hopper 20.
is communicated with.

Reference numeral 21 denotes a filling hopper, whose lower end is connected to the upper part of the elevator 19.

2 is a pressure detection device for detecting the pressure inside the hot air chamber 1, and 22 is a hot air temperature measuring device for detecting the temperature of the hot air, each of which is disposed within the hot air chamber 1.

23 is a control box, and this control box 23 includes a pressure detection device 2, a hot air temperature measurement device 22, and a moisture content meter 2.
4 is connected, and the variable motor 17 of the suction fan 6
and a hot air generator 15 are connected.

FIG. 3 shows a block diagram of the control device 23, in which 3 indicates a preset amount of hot air to be blown into the hot air chamber 1.
4 is a comparison circuit that compares the measured pressure value in the hot air chamber 1 detected by the pressure detection device 2 with the constant pressure value preset by the reference r=force setting device 3; Based on the comparison result of the comparison circuit 4, the output is sent to the fan rotation speed control device 5 and the fan drive circuit 25
The rotational speed of the variable motor 17 is controlled via the rotation speed of the suction fan 6 to convert the rotational speed of the suction fan 6. The comparison circuit 4 and the fan rotation speed control device 5 constitute a control device that controls the hot air generator so that the pressure detected by the pressure detection device 2 matches the pressure set by the reference pressure setting device.

26 is a hot air temperature setting device that presets the temperature of the hot air based on the amount of grain loaded, etc., and during drying, sets the temperature of the hot air according to the moisture content of the grains detected by the moisture content meter 24; is a comparison circuit that compares the measured hot air temperature value measured by the hot air temperature measurement device 22 and the set hot air temperature value set by the hot air temperature setting device 26 and calculates the difference; Based on the result, it is output to the fuel control device 28 to control the fuel supply to the hot air generator 15.

Next, we will explain the effect.

When performing drying work, the hot air temperature setting device 26 sets the hot air temperature based on the amount of grain stuffed into the storage chamber 7, etc., and the reference pressure setting device 3 sets the hot air temperature at a constant temperature in the hot air chamber 1. Set the reference pressure.

In this way, when the hot air temperature and hot air pressure are set and the grains are put into the charging hopper 21, they are conveyed upward by the elevator 19, passed through the supply hopper 20, and then horizontally transferred by the upper transfer spiral 8 and stored. It falls from the outlet 10 at the upper medium heat position of the chamber 7, is evenly destroyed by the rotating dispersion rotor 9, and is stored. When a predetermined m of grains are stored in the storage chamber 7 and the drying operation is started, the grains in the storage chamber 7 are slowly fed into the harvesting chamber 13 by the rotary valve 18 via the drying chamber 11. Grain drying room 1
1, the burner 15 and suction fan 6
The heated air flows from the hot air volume 1 through the ventilation frame 12, passes through the grains in the drying chamber 11 to dry the grains, and further passes through the ventilation frame 12, enters the ventilation chamber 16, and is discharged to the outside by the suction fan 6. be done. The grains received by the hot air and flowed down into the harvesting chamber 13 are transported horizontally by the lower transfer spiral 14,
Lifted by elevator 19, supply hopper 20
is transported horizontally by the upper transfer spiral 8 to the storage chamber 7.
It falls from the discharge port 10 at the upper medium heat position, is evenly distributed by the rotating dispersion rotor 9, and is sent into the storage chamber 7 again.

In this way, the grains are dried one after another while being circulated, but at the early stage of drying, the grains flowing down inside the drying chamber 11 are coarsely ground due to the influence of plaster-adhered powder and straw debris.
Hot air passes smoothly between the grains in the drying chamber 11. As the drying of the grains progresses, the density of the grains flowing down in the drying chamber 11 becomes denser, and the amount of hot air passing between the grains in the drying chamber 11 gradually decreases. As the heat [i] passing through the drying chamber 11 changes, the pressure inside the hot air chamber 1 increases, but this pressure change is constantly detected by the pressure detection device 2, and the detected measured pressure value is Comparison circuit 4
is input. Then, the comparator circuit 4 compares the hot air pressure with the hot air pressure set by the reference pressure setting device 3.

If the comparison result by the comparison circuit 4 is that the measured pressure value is higher than the reference pressure value, then the amount of hot air that passes through and covers the grains in the drying chamber 11 will be at the pressure set by the reference jL force setting device 3. If the volume of hot air is lower than the volume of hot air, the number of rotations of the variable motor 17 is increased via the fan rotation speed control device 5 to rotate the suction fan 7 at high speed to avoid increasing the volume of hot air.

In addition, if the measured pressure value is lower than the standard pressure value, that is, the amount of hot air passing between the grains in the drying chamber 11 is greater than the amount of hot air based on the pressure set by the standard pressure setting device 3. In this case, the rotation speed of the variable motor 17 is lowered via the fan rotation speed control device 5 to cause the suction fan 6 to rotate at a low speed to avoid reducing the amount of hot air.

On the other hand, the hot air temperature is constantly detected by the heat F1+temperature measuring device 22, and the detected measured hot air temperature value is input to the comparison circuit 27. Then, the comparison circuit 27 compares the set hot air temperature value set by the hot air temperature setting device 26.

If the comparison result by the comparison circuit 27 is that the measured hot air crystal value is higher than the set hot air temperature value, the fuel control device 28
The amount of fuel supplied to the hot air generator 15 is reduced via the hot air generator 15 to prevent the temperature from rising above the set point. In addition, if the measured hot air temperature value is lower than the set hot air temperature value, the fuel y4
The amount of fuel supplied to the hot air generator 615 is increased via the control device 28, and the temperature of the hot air is increased.

Above statement J: As is clear, as the grains dry, the density between the grains increases, the pressure of the hot air in the hot air chamber increases, and the amount of hot air ω that passes through and covers the grains becomes smaller. . However, the pressure detection device detects the pressure of this hot air, and the control device controls the hot air generator so that the detected pressure matches the constant hot air If force set by the reference pressure setting device. The amount of hot air suitable for drying can be obtained.

Therefore, overdrying or underdrying can be reduced, a constant drying loss rate can be obtained, and the drying condition can be improved.

It should be noted that the present invention is not limited to the above-described embodiments, and the invention may be practiced in modes other than the above-described embodiments.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention.
The figures are a partially cutaway side view of a grain dryer equipped with a device according to the present invention, FIG. 2 is a front view, FIG. 3 is a front sectional view, and FIG. 4 is a block diagram of a control device. (Explanation of symbols representing main parts of the drawings) 1... Hot air chamber 2... Pressure detection device 3... Reference pressure setting device 4... Comparison circuit 5... Fan rotation speed control device 6. ...Suction fan fi revision Applicant Tsuki Seki No (Ikukokai Ne 11! Edited by:
Cabinet Figure 1 + 4 'IF3'l:j 12 Figure 2

Claims (1)

[Claims] A pressure detection device for detecting the pressure of hot air is installed in a hot air chamber that dries granules using hot air generated by a hot air generator, and a reference pressure horn setting device for setting a constant hot air pressure is provided. ,
1. A drying control device for drying grains, characterized in that a control device is provided for controlling a hot air generator so that the pressure detected by the pressure detection device does not match the pressure set by the reference pressure setting device.