JPH02133788A - Drying control system for grain dryer - Google Patents

Abstract

PURPOSE:To prevent grains to be exposed to hot air at a high temperature at the initial stage of drying by a method wherein the loaded quantity of grains is corrected in accordance with the drying degree of the grains, with respect to the actually loaded quantity detected by a sensor for the loaded quantity of grains, covering a predetermined period of time after the starting of a drying operation, and the drying operation is controlled for the loaded quantity thus corrected. CONSTITUTION:The loaded quantity of grains loaded in a grain drying tank 1 storing the grains is detected by a sensor 3 for the loaded quantity of grains and, with respect to the actually loaded quantity of grains detected by the sensor 3 for the loaded quantity of grains, this loaded quantity of grains thus detected is corrected in accordance with the drying degree of the grains in the grain drying tank 1 within a predetermined period of time after the starting of a drying operation. According to the loaded quantity of grains thus corrected, the temperature of hot air to be generated from a burner under a drying condition is set by an automatic drying controller, and the grains that repeatedly circulate in said grain drying tank 1 are exposed to and dried by the hot air at the preset temperature.

Description

[Detailed description of the invention] Application field of industry-1- The present invention relates to a drying control method for a grain dryer.

Conventional technology In the past, the amount of grain loaded into a grain drying tank was detected by a grain loading sensor, and the drying was carried out by an automatic drying control device that set the detected grain loading amount as a drying condition. This method corrects the detected grain loading amount based on the density of the grain with respect to the actual loading amount detected by a sensor.
There was no method for controlling drying using this corrected filling amount.

Problems to be Solved by the Invention Pitching in a grain drying tank for storing grain 'j5!
The amount of grains is detected by a grain loading sensor, and the temperature of the hot air generated from the burner under drying conditions is set in the automatic drying control device based on the detected grain amount, and the temperature of the hot air generated from the burner under drying conditions is applied to the grain drying tank. The grains that circulate inside are exposed and dried.

During this drying process, if there are a large amount of ramus-attached grains mixed in with the grains, or if there is a large amount of straw mixed in, the drying of the grains will not be possible within the specified time from the start of drying. The density becomes coarse, and for this reason, the actual grain loading amount detected by the grain loading sensor may be detected as being more loaded than the actual loading amount, and this detection may cause the hot air temperature to change. was set at a high temperature, and when the grains had high moisture content at the beginning of drying, the grains were exposed to high-temperature hot air and dried, resulting in a decrease in the taste of the grains. Moreover, the quality of the grains sometimes deteriorated.

Means for Solving the Problems The present invention provides an automatic drying control device (2) that uses the amount of grain loaded in a grain drying tank (1) as a drying condition. The grain loading amount sensor (3
) A drying control system for a grain dryer characterized in that drying is controlled using a corrected loading amount obtained by correcting the detected actual loading amount based on the dry density of grains.

Effect of the Invention The amount of grains loaded into the grain drying tank (1) for storing grains is detected by the grain loading amount sensor (3), and the grains are The detected amount of loaded grains is corrected based on the dry density of the grains in the grain drying tank (1) with respect to the actual loaded amount detected by the grain loaded amount sensor (3), and this correction The automatic drying control device (2
), the temperature of the hot air generated from the burner under drying conditions is set, and the grains that are repeatedly circulated within the grain drying 41 (1) are exposed to the set hot air and dried.

Effects of the Invention According to the present invention, the detected amount of loaded grains in the grain drying tank (1) is corrected by the dry density within a predetermined time from the start of drying. By correcting the detected mulch amount to be close to the actual mulch amount, the setting of drying conditions is controlled by the actual mulch amount. The grains are no longer exposed to high-temperature hot air, the quality of the dried grains is stabilized, and the taste of the dried grains does not deteriorate.

For your convenience, (4) is a grain dryer, and inside this dryer (4), each drying chamber (5) is partitioned on both sides with a ventilation net.
) The upper part communicates with the grain drying tank (1), and the lower part communicates with the grain collecting trough (7) equipped with a transfer spiral through a delivery valve (6), and the grain drying tank (1) is the machine wall (8
), and above the grain drying tank (1) there is a ceiling plate (9) and a transfer gutter (10) equipped with a transfer spiral.
), a supply port for supplying transferred grains into the grain drying tank (1) is provided in the center of this transfer gutter (10), and a diffusion plate (11) is provided below this supply port. , this diffuser (1
In step 1), the grains are uniformly diffused and returned into the grain drying tank (1).

The hot air chamber (12) is formed between the inner sides of the drying chamber (5), and has a grain loading amount that detects the amount of grain loaded into the grain drying tank (1). A sensor (3) is installed on the front machine wall (8), and this grain filling amount sensor (3) is installed on the front side to detect the pressure inside the grain drying tank (1) from the ceiling plate (9). It is composed of a pressure sensor (13) provided on the machine wall (8), and a pressure sensor (10) provided on the machine wall (8) on the front side for detecting the pressure in the hot air chamber (12), The amount of grain loaded into the grain drying tank (1) is calculated based on the difference in pressure detected by these pressure sensors (13) and (14), and the hot air chamber (12) There is a hot air temperature sensor (
15), each drying chamber (5) is provided with an exhaust chamber (IB) on the outside, and a burner case (17) containing a burner (17) is formed on the front wall (8) of the machine. 18) and an operating device (19) for starting and stopping this dryer (4)
The burner (17) and the hot air chamber (12) are configured to communicate with each other, and the rear wall (8) is equipped with an exhaust fan (
20) and a variable speed motor (21) are provided, and this exhaust fan (2
0) and each of the ventilation chambers (18) are configured to communicate with each other,
This variable speed motor (21) is configured to rotationally drive the transfer spiral in the grain collecting trough (7), each of the delivery valves (6), the exhaust fan (20), etc., and generates electricity from the burner (17). The hot air is passed from the hot air chamber (12) to the drying chamber (5),
Air is sucked and exhausted by the exhaust fan (20) through the exhaust chamber (18), and (44) is configured to detect whether or not the delivery valve (6) is rotating using a rotation sensor. be.

The burner (17) is provided with a fuel pump (22) having a fuel valve on the outer side of the lower plate of the burner case (18), and this fuel pump (22) sucks the fuel in the fuel tank (23). It is configured to be supplied into the burner (17),
Also, on the outside of the upper plate there is a ventilation +1 (24) and a motor (25).
is provided, and the rotation of this motor (25) causes the blower (2
4) is rotationally driven, and this blower (24) supplies combustion air into the burner (17).

The grain raising machine (26) is installed in the front part of the machine wall (8) on the front side, and a packet conveyor (27) belt is stretched inside between the -1 and lower pulleys, and the upper end and the transfer gutter (10 ) A dispensing pipe (28) is provided between the starting end and the grain collecting trough (7) for communication, and a supply trough (28) is provided between the 1' end and the terminal end of the grain collecting trough (7) for communication. This F? Grain machine (2B)-
A motor (30) is provided in the L portion, and the motor (30) is configured to rotationally drive the packet conveyor (27), the transfer spiral in the transfer gutter (10), the spreader plate (11), etc. A hopper is installed at the bottom to feed the grains.
In addition, the packet conveyor (27
) The structure includes a moisture sensor (32) equipped with a motor (31) that receives grains that fall during transportation to the chilx section, crushes the grains under pressure, and detects the moisture content of the crushed grains. It is.

[The operating device (18) described in 11j is box-shaped, and on the surface plate of this box are each a start switch (33) for starting the dryer (4) separately for each operation of loading, drying and discharging, and this A stop switch (34) for stopping the dryer (4), a grain type setting setting standard (35) that serves as a setting standard for the temperature of the hot air generated from the burner (17), , crotch t! "Moisture setting hole (3B) to set the finishing target moisture of L, hot air temperature,
It is equipped with a display window (37) and a monitor display for displaying grain moisture, remaining drying time, etc., and a control device (38) and automatic drying control device (2) inside. (35) and (3B) are rotary switch types,
Depending on the operating position of each of these setting knobs (35) and (36), the standard for the - part of the hot air temperature is set, and the finishing target moisture content of the grains is also set.

The automatic drying control device (2) includes each of the pressure sensors (13
), (14), an A-D converter (39) that performs AD conversion of the detection signal 1 detected by the rotation sensor (44) and the hot air temperature sensor (15), and this A-D converter (39) An input circuit (40) to which the converted value is input, an input circuit (41) to which the operation of the grain type setting sowing (35) is input, and input from each of these input circuits (40) and (41). The CPU (42) performs arithmetic and logical operations and comparison operations on various input values, and the output circuit (43) receives and outputs various commands from the CPU (42).
This is a configuration with a

The control device (38) includes an A-D converter that converts the detection value detected by the moisture sensor (32) into A-D;
An input circuit into which the converted value converted by the D converter is input, an input circuit into which the operation of each of the above-mentioned SW, Q (33), (34) and the above-mentioned moisture setting fine (36) is input, and each of these input circuits. This CPU (42) performs arithmetic and logical operations, comparison operations, etc. on various input values input from the CPU (42).
2) has an output circuit that receives and outputs various commands.

Amount of grains loaded into the grain drying tank (1) (W)
Detection is based on the detected pressure (
A), the hot air chamber (
The detected pressure (B) in 12) and the coefficient (S) set and stored in this CPU (42) are substituted into the following equation set and stored in this CPU (42) to obtain a correction value based on dry density. (M) is calculated, and the correction value (M) = pressure in the grain drying tank (A) x coefficient (S)
/ Pressure inside the hot air chamber (B) Correction value (M) obtained by calculation 5 using the above formula and each pressure sensor (
The CP
This is a configuration in which the corrected tensioning amount (W') is calculated by substituting into the following equation set and stored in U (42), and the corrected tensioning amount (W') - the amount of grains tensioned (W) ×Correction value (M) Hot air generated from the par ± (17) according to the supplementary filling amount (W') calculated by the formula -1- and the operation position of the grain type setting knob (35) The temperature is set, and the coefficient (S) for calculating the correction value (M) is 0.65 and 17 for 30 minutes from the start of drying, and 0.7 and 12 for 30 minutes and 1 hour. .0.75 from 1 hour to 1 hour 30 minutes, 0.8 from 1 hour 30 minutes to 2 hours, and 0.8 from 2 hours to 2 hours 30 minutes.
5, 0.9 from 2 hours 30 minutes to 3 hours, 0.95 from 3 hours to 30 minutes, 3
This is a configuration in which the CPU (42) -2 is set and memorized so that the time 30 share [is set to 1.0 and supplementary II is not performed, and the dry density is The structure is such that the amount of grain ¥ (W) that changes is corrected using a predetermined correction value (M).

As shown by the curve in FIG. 2, the pressure ratio detected by the pressure in the grain drying tank (1) and the pressure in the hot air chamber (12), for example, (a), (b), (c) , (d), (e)
, (to), (1.) Haku's respective I〆(time stakeout♀,
(A), CB), (C), (D), (E), (F), (
G) The relationship between the values is set and stored in the CPU (42), and the stored pressure ratios and the pressure sensors (13), ( 14) detects the pressure inside the grain drying tank (1) and the hot air chamber (1).
2) is input to the CPU (42), a pressure ratio is calculated from each input detected pressure, and the CPU (42) compares this calculated pressure ratio with the set and memorized pressure ratio. The set memory pressure ratio that is the same as the calculated pressure ratio is selected.
If the selected set memory pressure ratio is the (E) value, the loaded grain amount (W) is detected to be the (F, ) value, and this (E) value is corrected as described above. and the CPU
When the predetermined pressure ratio set and stored in (42) and the pressure ratio obtained by calculation become the same, the grain drying tank (1)
The dryer (4) is configured to detect when the dryer (4) is full of grains, and to automatically stop the dryer (4) based on this full amount detection by the CPU (42).

The grain density in the grain drying tank (1) and the drying chamber (5)
), the operation of the start switch (33) to start the staking operation is performed at the same time as the CP.
When input to U (42), this CPU (43) rotates the variable speed motor (21) at low speed, and rotates the +fit delivery valve (6) and the transfer spiral in the grain collection gutter (7) at low speed. It is configured to drive to make the dry density uniform.

For example, the CPU (42) may set and store only the time during which the grains flow through the drying chamber (5), and the tightened grains may be Amount (W)
It may also be configured to correct (W') for the correction extension.

During the tensioning operation, the feed valve (6) and the grain collection gutter (
7) Said transfer Ii+ in! In a machine in which the first rotation is stopped, the grain tensioning work is completed and the drying work is started, and the rotation sensor (44) detects the rotation of the feed valve (6), and this detection causes the CPU to (42), but when the drying operation is stopped midway and the staking operation is performed again, the amount of stubbed grain (W) due to this additional staking is detected as follows. This is a configuration in which the grain content (W) is not corrected.

The hot air temperature automatically set above and the hot air temperature sensor nJ
- If the detected hot air temperature detected by (15) is different, the temperature will be the same as the set hot air temperature.
+111 The number of times the fuel valve is opened and closed is controlled by the automatic drying control 1.
! It is configured to be automatically controlled by device (2).

The grain moisture is determined by the control device R (38) when the moisture sensor (32) detects the same grain moisture as the target moisture set by operating the moisture setting knob (3B). It is configured to automatically stop the dryer (4) through automatic control and display the detected moisture on the display window (37).

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

Start switch (
33), the dryer (4) starts,
When the grains are fed into the loading hopper of the grain raising machine (26), they are transported to the upper part by the packet conveyor (27) and transferred to the dumping tube (28).
) into the transfer gutter (10), and this transfer gutter (l
supplied to the diffusion plate (11)-t- by a transfer spiral in O);
The grains are diffused into the drying tank (1) by this diffusion plate (11) and placed in the grain drying tank (1), and during this filling operation, the pressure inside the grain drying tank (1) is detected by a pressure sensor (13). The pressure in the hot air chamber (12) is detected by the pressure control sensor (14), a pressure ratio is calculated based on each of these detected pressures, and the pressure ratio obtained by this calculation is compared with the set and memorized pressure ratio. , from the comparison of this pressure ratio, the amount of grain tension is detected, and when this detected pressure ratio becomes the same as the predetermined pressure ratio that has been set and stored, the grain drying is 4t'! (1) Detects that the interior is full of grains,
The dryer (4) is automatically stopped by the automatic drying control device (2) of the operating device (19).

When the tensioning work is completed, each setting knob (35), (36) of the operating device (19) is moved to a predetermined position, and the start switch (33) is operated to start the drying work.
The dryer (4), moisture sensor (32) and burner (17)
etc. are started, a pressure ratio is calculated from the operation position of the grain type setting spreader (35) and the detected pressure detected by each pressure sensor (13), (14), and from this calculated pressure ratio, the grain is set. The detected filling amount is corrected based on the dry density within a predetermined time from the start of drying, and the temperature of the hot air generated from the burner (17) is adjusted by the automatic drying control device based on the corrected filling amount. (2), and this set hot air temperature is passed from the hot air chamber (12) to the drying chamber (5), passes through the exhaust chamber (16), and is suctioned and exhausted by the exhaust fan (20) to dry the grains. Inside the tank (1) - The stored grains are transferred to this grain drying tank (1).
) is exposed to this hot air while flowing down in the drying chamber (5) and dried, and is fed out to the lower part by the delivery pulp (6) and flowed down to be supplied into the grain collection gutter (7). The lower part is transferred from the gutter (7) through the supply gutter (28) into the M grain machine (28).
111k, and the brush 2 conveyor (27
)-r: conveyed to 1-m, supplied into the transfer gutter (10) through the dispensing tube (28), and onto the spreading plate (11) by the transfer spiral in the transfer gutter (10). The grains are transferred and supplied to the grain drying tank (1) by this diffusion plate (11), and are evenly diffused and reduced into the grain drying tank (1), and are circulated and dried, and the moisture sensor (32) operates the moisture setting sprinkler (3G). When a grain moisture content equal to the target moisture content is detected, the control device (38) of the operating device (19) automatically controls the dryer (4) to automatically stop the dryer (4).

[Brief explanation of the drawing]

The figures show an embodiment of the present invention; Fig. 1 is a block diagram, Fig. 2 is a relationship between the filling amount and pressure ratio, and Fig. 3 is a relationship between drying time and coefficient. , FIG. 4 is an overall side view of the dryer, partially broken away, FIG. 5 is a sectional view taken along line AA in FIG. 4, and FIG. 6 is an enlarged front view of the dryer, partially broken away. In the figure, reference numeral (1) indicates a grain drying tank, (2) an automatic drying control device, and (3) a grain filling amount sensor.

Claims (1)

[Claims] In an automatic drying control device (2) that uses the amount of grains in the grain drying tank (1) as a drying condition, the amount of grains in the grain drying tank (1) is measured by a grains amount sensor (3) for a predetermined period of time from the start of drying. ) A drying control method for a grain dryer, characterized in that drying is controlled using a corrected loading amount obtained by correcting the detected actual loading amount based on the dry density of grains.