JPH02245647A - Grain particle moisture detection system for grain drying machine - Google Patents

Abstract

PURPOSE:To achieve a higher moisture measuring accuracy by determining a correction factor for correcting a grain particle moisture based on a temperature of a grain particle calculated from a temperature of hot air before and after the passage of air through drying chambers and a temperature of an electrode roll. CONSTITUTION:Grain particles held in a storage chamber 1 are circulated repeatedly flowing down through drying chambers 2 from the storage chamber 1 and with the passage of a hot air through the drying chambers 2, the grain particles flowing down through the drying chambers 2 are exposed to the hot air to dry. The grain particles being dried are crushed between electrode rolls while moisture of the crushed grain particles is detected. Then, temperature of the grain particles immediately after the passage through the drying chambers 2 at the lowest level is calculated from a temperature of the hot air before the passage through the drying chamber 2 at the lowest level and a temperature of an exhaust air after the passage thereof. A correction factor is calculated from the temperature of the grain particles and the temperature of the electrode rolls to correct moisture of the grain particles detected. Thus, a grain particle moisture value with a high accuracy is obtained by correcting the moisture detected by the correction factor thus obtained.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a grain moisture detection method for a grain dryer.

Conventional technology Conventionally, grains are fed from the storage chamber in the upper part to the drying chamber in multiple upper and lower stages in the lower part, and are dried by blowing hot air while flowing down, and the moisture content of the grains being dried is detected by a pair of electrode rolls. Then, a correction value is calculated for this detected grain moisture by using the hot air temperature before ventilation, the exhaust air temperature after ventilation, and the temperature of the electrode roll at any position above or below the drying chamber, and this detected grain moisture is The value was corrected, and the corrected grain moisture obtained by this correction was replaced with the detected grain moisture.

Problems to be Solved by the Invention The grains stored in the storage chamber are repeatedly circulated from the storage chamber to each drying chamber and flowed down, and hot air is passed through each drying chamber. The grains flowing down are exposed to this hot air and dried, and some of the grains during this drying are crushed under pressure between a pair of electrode rolls, and at the same time, moisture in the crushed grains is detected. 1. For example, the temperature of the grains flowing down the drying chamber in the uppermost stage is calculated from the temperature of the hot air before ventilation and the temperature of the exhaust air after ventilation,
A correction value for correcting the detected grain moisture is calculated from the calculated grain temperature and the temperature of the electrode roll, the detected grain moisture is corrected by the correction value obtained by this calculation, and the corrected grain Moisture is replaced by detected grain moisture.

By calculating the detection of the grain temperature during drying from the hot air temperature before and after ventilation in the drying chamber on the top stage and the exhaust air temperature, the calculated grain temperature and the grain crushed by the electrode rolls can be calculated. The grain temperature may differ significantly, and therefore, even if the detected grain moisture is corrected, it may not be possible to obtain an accurate grain moisture.

Means for Solving the Problems This invention provides a drying chamber (1) in the upper storage chamber (1) in the lower part in which the grains are fed out and dried by passing hot air through them while flowing down. In a grain dryer equipped with a pair of electrode rolls (3) for detecting grain moisture, the temperature of the hot air before ventilation, the exhaust air temperature after ventilation, and the electrode roll in the drying chamber (2) at the lowest stage are determined. The structure of the grain moisture detection method is characterized in that the grain moisture detected by the electrode roll (3) is corrected based on the temperature (3).

Effect of the invention The grains accommodated in the storage chamber (1)
The hot air is circulated through each drying chamber (2) while the circulation of air flowing down from each drying chamber (υ) is repeated.
The grains flowing down each of the drying chambers (2) are exposed to the hot air and dried, and a portion of the drying grains are crushed between the electrode rolls (3) and (3) under pressure. At the same time, moisture in the crushed grains is detected, and the drying chamber (2) at the lowest level is
From the hot air temperature before ventilation and the exhaust air temperature after ventilation, the temperature of the grain immediately after passing through this drying chamber (2) at the lowest stage is calculated, and the calculated grain temperature and the electrode roll ( 3)
A correction value for correcting the detected grain moisture is calculated from the temperature of , and this detected grain moisture is corrected by the correction value obtained by this calculation,
This corrected grain moisture is replaced with the detected grain moisture.

Effects of the Invention According to this invention, the temperature of grains immediately after passing through the drying chamber (2) at the lowest stage is in a proportional relationship with the exhaust air temperature after ventilation of this drying chamber (2). 3) The grain temperature that reaches the drying chamber (2) in the lowest stage is almost the same as the grain temperature calculated from the hot air temperature before ventilation and the exhaust air temperature after ventilation. A correction value is calculated based on the calculated grain temperature and the temperature of the electrode roll (3), and the grain moisture detected between the electrode rolls (3) and (3) is corrected with this correction value. This greatly improved moisture measurement accuracy.

Embodiment 1 An example of the drawing explains a state in which a moisture measuring tree (5) is attached to a grain dryer @14).

The dryer 4) has a storage chamber (1) formed in the upper part of the machine wall (6), and a delivery valve (1) below the storage chamber (1).
drying chambers (2) rotatably mounted on a shaft are formed between the ventilation screens and are arranged side by side to communicate with each other, and each of the drying chambers (2) installed in parallel is provided in two upper and lower stages and communicated with each other, and this lower section Each drying room (2
) At the bottom, there is a grain collection @ (B) equipped with a transfer spiral, which communicates with each other, and a hot air chamber [9] is formed between the upper and lower drying chambers. Each hot air temperature sensor (to) for detecting the hot air temperature in the hot air chamber (9) is provided in the hot air chamber (9), and an exhaust chamber Oo is formed outside each of the upper and lower drying chambers (2). This lower exhaust chamber Oo is provided with an exhaust air temperature sensor for detecting the temperature of the exhaust air inside this exhaust chamber I.

On the front machine wall (6), there is a burner case (l) installed on the top and bottom, which houses the operating device No. 3 for starting and stopping the dryer (4) and the burner (14), and the burner (to) on the upper side. The hot air chamber (9) on the upper side communicates with the hot air chamber (9) on the lower side, and the burner (to) on the lower side communicates with the hot air chamber (9) on the lower side. is provided with a fuel pump having a fuel valve, and by opening and closing each fuel valve, each fuel pump sucks in fuel from the fuel tank (m) and supplies it to each burner. In addition, a blower (11) and a variable speed motor (FI) are provided on the outside of the upper plate, and the rotation of each variable speed motor (1) rotates each blower. The configuration is such that air is supplied to each of the burners, and the rear burner (6) is provided with an exhaust fan (to the top) and a motor (for the motor) above and below, and this exhaust fan on the upper side and the upper The exhaust fan (to) on the lower side is connected to each of the wandering air chambers (1) on the lower side, and the motor 121) Each payout valve (7).

It is configured to rotationally drive the transfer spiral, each of the exhaust fans, etc.

A ceiling plate (to) and a transfer gutter (to) equipped with a transfer spiral are provided on the upper side of the storage chamber (1), and the central part of this transfer gutter is used for supplying grains to be transferred into this storage chamber (). A port is provided, and a diffusion plate (to) is provided below the supply port to uniformly diffuse and return the grains into the storage chamber (1).

The grain hoisting equipment is installed in the front part of the machine wall (6) on the front side, and inside, four packet conveyor belts are stretched between the upper and lower pulleys, and between the upper end and the starting end of the transfer gutter (to). A dispensing tube is provided for communication, a supply gutter is provided between the lower end and the terminal end of the grain collecting gutter (8) for communication, and a motor is provided at the upper part of the grain hoist. The four belts of the packet conveyor, the transfer spiral in the transfer gutter (2), the spreader plate, etc. are rotated by the rotation of this motor. The moisture measuring device (5) is installed in the center of the direction, and the grains that fall while being conveyed to the upper part by the packet conveyor (to) are received by the grain trough (to), and the grains falling from the packet conveyor (to) are received by the grain trough (to). The grains are guided downward and supplied into the moisture measuring device (5).

The moisture measurement @ 15) is carried out by transporting the grains supplied from the box-shaped grain stream m (to) one by one using the guide plate OD and the transfer roll (2), and then transferring the grains one by one to the lower electrode roll 13). , (3) is supplied onto the electrode roll (3), (3), and 32 grains are fed one by one to the outer peripheral surface of the electrode roll (3), and each grain is crushed under pressure, and at the same time, the water content of the crushed grains is detected. Yes.

The bottom side of each electrode roll (3) is
) Cleaning metals (to), (to) that remove and clean crushed grains for which moisture has been detected adhering to ) has crushed grain and the transfer roll (
A discharge gutter (end) is provided to guide the remaining grains that were not transferred by the support (support) to the west direction of the grain hoist, and a motor (to) that rotationally drives each part of this moisture measurement 1 (5) is provided in the upper part of the box. 2).

Said control device! +11 is box-shaped, and the dryer (4) is mounted on the surface plate of this box body, and there are a start switch (to) to start the dryer (4) for each drying and discharge operation, and a stop switch (to) to stop the dryer (4). Each temperature setting (to) sets the temperature of the hot air generated from (to) depending on the operating position, and the moisture setting setting (to) sets the finishing target moisture depending on the operating position.
The structure includes a display window 14D and a monitor display for displaying the grain moisture detected by the moisture measuring device (5), the hot air temperature detected by the hot air temperature sensor Oe, the remaining drying time, etc. This configuration includes a drying control device H and a combustion control device.

Each of the settings (to), (to), and (2) is of a rotary switch type, and is configured to set a predetermined numerical value depending on the operating position.

The drying control device (transfer) is configured to perform the moisture measurement '14 (5)
The electrode roll (3) and each temperature sensor (11,
(2) A-D converting the detected value detected by (to)
D converter section, an input circuit into which the converted value converted by this A-D converter is input, an input into which the operation of the respective switches (B) and (To) and the moisture setting setting are input. circuit),
A CPU (capital) that performs arithmetic and logical operations, comparison operations, etc. on the various input values input from each of these input circuits (a) and 2).
.

The configuration includes an output circuit (2) that receives and outputs various commands from the CPU.

The combustion control device! (B) is an input circuit into which the operations for each temperature setting (to) and (to) are input; The configuration includes an output circuit that receives and outputs various commands issued from the CPU.

The drying control device! ! The drying control based on 0δ and the detected grain moisture correction control correct the grain moisture (MS) detected between the moisture measuring device (the electrode rolls (3) and +3 of 51). The configuration is to correct the correction value (S)%, and the calculation of this correction value (S)% is as follows.

For example, the hot air temperature (T
n) is detected as 50.5°C by the hot air temperature sensor (to), and this detected hot air temperature (TB') 5G, 5°C is the CP
It is input to U (capital), and each of the above-mentioned ventilation chambers at the lowest stage are
The exhaust air temperature (TE) in 1 is detected as 35.5°C and 34.5°C by each exhaust air temperature sensor Ii, and the detected exhaust air temperature ('r E ) is 35.5°C and 34.5°C. ℃ and the CP
The average value is calculated as 35℃, and these detected hot air temperature (TB) and detected exhaust air temperature (TE) are input to the following formula (a) which is set and stored in the CPU (equipment). The grain temperature (TG) immediately after being fed out and flowing down the drying chamber 12) at the lowest stage is calculated to be 38.875° C. and is stored in the CPU (a).

Grain temperature (TO) = [Detected hot air temperature (TB) + 3 x detected wandering air temperature (TE)] / 4 - (a) = (50, 5 + 3 x 35) / 4 = 38.875
Also, the electrode temperature (TH) of the electrode roll (3) is detected as 30°C by the electrode temperature sensor (to), and this detected electrode temperature (TH) of 30°C is input to the CPU (equipment), and this detected Electrode temperature (TH) 30℃ and calculated grain temperature (TG) 3
L875℃ is substituted into the following formula (b) set and stored in the CPU (capital), and the correction value (S) is calculated as -0.17f5%, and the correction value CS >= C calculated grain temperature (TG) - detection electrode temperature (TH) ) /so
...(b) = (38,875-30) 15G = -0,1775% The detected grain moisture (MS) is detected to be 22%, and this detected grain moisture (MS) 22% is the CPU If it is input to (c), this detected grain moisture (MS) of 22% is corrected by the correction value (S) -001775% as shown below, and the corrected grain moisture (MSI) is 21.8225%. calculated,
This corrected grain moisture (MSI) of 21.8% is displayed on the display window 141) as the detected grain moisture.

Corrected grain moisture (MS) = Detected grain moisture (MS) - Correction value (S) = 22 - 0.1775 = 21.8225% The finishing target moisture set by operating the moisture setting method The corrected grain moisture (MSI) obtained from the calculation of
The dryer (4) is automatically controlled to stop the drying of the grains.

The combustion control device! In the combustion control according to (a), the hot air temperature detected by the hot air temperature sensor (to) is compared with the set hot air temperature set by operating each of the temperature settings (to) and (to), and the hot air temperature detected by the hot air temperature sensor (to) is compared. The number of times the fuel valve is opened and closed is controlled so that the temperature is the same as the set hot air temperature.
The amount of fuel sucked by the fuel pump Oe is determined by this combustion control device l! This is a configuration controlled by (a).

Hereinafter, the operation of the above embodiment will be explained.

When the grain dryer starts, each part of the grain dryer starts by operating each setting (to), (to), - on the operating device 1Crs to the specified position and operating the start switch (b) to start drying. At the same time, each burner (to) and the moisture meter (5) are started.

Hot air is generated from this burner (B), and this hot air is transferred to the hot air chamber (
The grains stored in the storage chamber (1) are ventilated from the drying chamber (2) through the ventilation chamber 0υ and then sucked and exhausted by the exhaust fan (to). ) is exposed to this hot air and dried while flowing down in the drying chambers (2) above and below, and is fed out to the lower part by the feeding valve (7) and flows down into the collecting trough (8).
The grains are transferred from inside through the feeding machine (to) into the grain raising function by the lower transfer spiral, transported to the upper part by the packet conveyor 4, passed through the dispensing tube (2), and fed into the transfer gutter, and this transfer I
10 to the top of the diffusion plate ■ by the upper transfer spiral,
This diffusion plate (to) evenly diffuses and returns into the storage chamber (1), circulates and dries the water, and the moisture measurement 11 (5) is the same as the finishing target moisture set by operating the moisture setting wax. When grain moisture is detected, the drying control bag MWJ of the operation bag Nff3
The dryer (4) is automatically controlled to stop the drying of the grains.

During this drying work, the grain moisture detected by the electrode rolls (3), (3) of the moisture measuring device (5) and the hot air temperature in the hot air chamber (9) at the lowest level are determined by the hot air temperature sensor. The temperature of the exhaust air in the exhaust chamber OD at the lowest stage is detected by the exhaust air temperature sensor u, and from the detected hot air temperature and exhaust air temperature, the temperature of the exhaust air in the exhaust chamber OD at the lowest stage is detected. The temperature of the grain immediately after it is fed out of the chamber (2) and flows down is calculated, and the calculated grain temperature and the temperature of the electrode roll (3) are detected by the electrode temperature sensor (to). A grain moisture correction value is calculated, the detected grain moisture is corrected using the calculated correction value, and the corrected grain moisture is replaced with the detected grain moisture.

a electromotive electrode rolls (3), (3) of the moisture measuring device (5);
Detected grain moisture (MS) detected between, detected hot air temperature (TB) in the hot air chamber (9) detected by the hot air temperature sensor (to), and The grain temperature (TG) calculated from the detected exhaust air temperature (TE) in the wind chamber Oo and the detected electrode temperature (TH) detected by the electrode temperature sensor (to) are set and stored in the CPUGf71 as follows. Substitute into equation (c) to calculate detected grain moisture (M
The structure is such that the corrected grain moisture (MSl) is calculated by correcting S), and the detected hot air temperature (TG) is calculated using the following formula (d), which is set and stored in the CPU (6). The structure is calculated by substituting the detected exhaust air temperature (TE) and the corrected grain moisture (MSI) = detected grain moisture (MS)
+ [Detection electrode temperature (TH) Calculated grain temperature (TO)] 150... (c) Grain temperature (TO) = 3/8X Detection hot air temperature (TB) + 5
/ 8 When the temperature is no longer detected, the grain temperature is no longer calculated, so the moisture content of the grain detected by the moisture measurement @ (5) immediately before this problem occurs.

From the hot air temperature in the hot air chamber (9) detected by the hot air temperature sensor (to) since the malfunction occurred, select the grain temperature set and stored in the CPU ■, as shown in Fig. 7. For example, if the detected grain moisture (MS) is 20%
and when the detected hot air temperature (TB) is 50°C, the seventh
From the figure, the grain temperature (TG) is selected as 30.5°C, and by substituting this selected grain temperature (TG) of 30.5°C into the above formula (c), the above corrected grain Moisture (MSI)
This is a configuration that calculates .

If a malfunction occurs in the exhaust air temperature sensor (b) that detects the exhaust air temperature while drying grains, and the exhaust air temperature is no longer detected, the detected grain moisture will not be corrected. Grain temperature is selected based on the hot air temperature and detected grain moisture, and the detected grain moisture is corrected using the selected and calculated grain temperature, detection electrode temperature, and detected grain moisture to calculate corrected grain moisture. and this corrected grain moisture is replaced with the detected grain moisture.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, in which Fig. 1 is a block diagram, Fig. 2 is an overall side view of the dryer that can be partially cut away, and Fig. 3 is a sectional view taken along line A-A in Fig. 2. Figure 4 is an enlarged side sectional view of the grain moisture measurement layer, Figure 5 is an enlarged rear view of the grain moisture measurement layer, Figure 6 is a partially cutaway front view of a part of the grain dryer, and Figure 7 is an enlarged side sectional view of the grain moisture measurement layer. The figure is a diagram showing the relationship between grain moisture, hot air temperature, and grain temperature. In the figure, reference numeral (1) indicates a storage chamber, (2) a drying chamber, and (3) an electrode roll.

Claims (1)

[Claims] From the upper storage chamber (1) to the lower drying chamber (2)
), the grains are dried by blowing hot air through them while flowing down, and are equipped with a pair of electrode rolls (3) for detecting the moisture content of the grains during this circulation drying. The drying room (2) is characterized by correcting the grain moisture detected by the electrode roll (3) based on the hot air temperature before ventilation, the exhaust air temperature after ventilation, and the temperature of the electrode roll (3). Grain moisture detection method.