JPH02302577A - Dry control system for grain drying machine - Google Patents

Abstract

PURPOSE:To reduce drying flecks of cereals, to eliminate cracks of a body and to obtain stable grain drying by calculating an irregularity in the heating temperature of a burner, controlling hot blast temperature to a low temperature if it becomes a predetermined value or higher, and simultaneously accelerating the circulating speed of the cereals during drying. CONSTITUTION:Cereals fed down in a drying chamber 2 are exposed with hot blast to be dried in such a manner that the hot blast generated from a burner 1 is ventilated in the chamber 2 while the cereals are repeatedly circulated to be fed down in the chamber 2. The temperature of the hot blast is detected by a plurality of hot blast temperature sensors 3 during drying, the atmospheric temperature is also simultaneously detected by an atmospheric temperature sensor 4, the average value of the detected hot blast temperatures is calculated so controlled that the calculated average temperature becomes the same as a set hot blast temperature, and an irregularity in the heating temperature of the burner 1 is calculated according to the detected hot blast temperatures and the detected atmospheric temperature. If the calculated irregularity becomes a predetermined range or more, the set hot blast temperature is automatically controlled to a predetermined low temperature, and the cereals amount to be circulated to be fed down is simultaneously controlled to be increased in a predetermined amount, and the cereals are dried.

Description

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

Conventional technology In the past, grains were dried by repeatedly circulating the grains in a drying chamber while exposing them to hot air generated from a heburner in the drying chamber.The temperature of this hot air was detected by a hot air temperature sensor. The detected hot air temperature and the set hot air temperature set according to the amount of grains to be dried are compared, and if there is a difference, the temperature is controlled to be the same as the set hot air temperature, and the amount of circulating grains is not controlled and remains constant. It was a drying control method that dried with a circulation rate of .

Problems to be Solved by the Invention Grain is fed out in a constant amount inside the drying chamber and flows down the drying chamber while repeating the @ ring, while the hot air generated from the burner is passed through the drying chamber and flows down the drying chamber.

The kernels inside are exposed to this hot air and dried.

During this drying, the hot air temperature is detected by a hot air temperature sensor, and the detected hot air temperature is controlled to be the same as the set hot air temperature, but the hot air temperature may vary depending on the ventilation points in the drying room. In some cases, this temperature unevenness causes drying spots to occur in the grains during drying, and these drying spots sometimes cause coarse splitting of the grains.

Means for Solving the Problems The present invention provides a drying chamber (2) in which grains are dried by passing hot air from a burner (1) while circulating them downward, and a drying chamber (2) in which the temperature of the hot air ventilated to this drying chamber (2) is controlled. In a grain dryer that is provided with a plurality of hot air temperature sensors (3) to detect the temperature of the outside air and an outside air temperature sensor (4) that detects the outside air temperature,
While calculating the variation in heating temperature by the burner (1) based on the hot air temperature detected by the hot air temperature sensor (field) and the outside air temperature detected by the outside air temperature sensor (4), the calculation variation is determined within a predetermined area. The drying control method is characterized in that when the above temperature is reached, drying is performed by automatically lowering the hot air temperature and simultaneously increasing the circulating grain amount.

Effect of the invention While the grains are repeatedly circulated in the drying chamber (2) and flowing down, the hot air generated from the burner (1) flows into the drying chamber (2).
), the grains flowing down this drying chamber +2) are exposed to this hot air and dried.

During this drying, the hot air temperature is detected by multiple hot air temperature sensors (3), and at the same time, the outside air temperature is also detected by the outside air temperature sensor (4).
The average value of the detected hot air temperature is calculated, and the calculated average temperature is controlled to be the same as the set hot air temperature. The variation in heating temperature is calculated,
When this calculation variation reaches a predetermined range or higher, the set hot air temperature is automatically controlled to a predetermined low temperature, and at the same time, the amount of circulating grains flowing down is controlled to increase by a predetermined amount to dry the grains. .

Effects of the Invention According to this invention, the variation in the heating temperature of the burner fil is calculated, and when the calculated variation exceeds a predetermined value, the hot air temperature of the burner (11) is controlled to a low temperature, and at the same time, the circulation of the grains during drying is controlled. By increasing the speed, drying spots on the grains are reduced, thereby making it possible to obtain stable drying of the grains without causing coarse cracking of the grains.

Embodiment In the example shown in Figure 5, (5) is a grain dryer, and the machine wall (6) of this dryer (5) has a rectangular shape that is long in the front and back direction, and consists of front and rear wall plates and left and right wall plates. The front wall board is provided with an operating device (7) for starting and stopping the dryer (5) and a burner case (8) containing a burner (1),
A fuel pump (9) having a fuel valve is provided on the outer side of the lower plate of the burner case (8), and when the fuel valve is opened and closed, the fuel pump (9) sucks the fuel in the fuel tank (lu) to the burner ( A blower +111 and a variable speed motor (lδ) are provided on the outside of the upper plate, and the rotation of the variable speed motor (121) drives the blower (11) to generate combustion air commensurate with the amount of fuel to be supplied. is configured to supply the burner (1) to the burner case (8).
The configuration is such that an air volume sensor u9 detects the amount of air passing through the interior, and the rear wall plate is provided with an exhaust fan +131, a motor Q41, and a variable speed motor.

In the center of the lower part of the inside of the machine wall (6), there is a grain collection gutter (formerly known as "former") equipped with a transfer spiral in the front and back direction, and on the upper side of the IQ there is a drying chamber (2) formed between the ventilation nets. The drying chambers (2) are arranged in parallel and communicated with each other, and the lower part of the drying chamber (2) is equipped with a feed-out valve (171) that feeds out the grains. The hot air chamber (1111) is provided with a plurality of hot air temperature sensors (3) for detecting the temperature of the hot air passing through the hot air chamber (1111), and is connected to the burner (11). (2)
A ventilation chamber (191) is formed on the outside, and each ventilation chamber (1ω
It has a configuration in which the exhaust fan (1'5) is communicated with the exhaust fan (1'5), and the
The variable speed motor (151) rotationally drives each of the delivery valves (17) via the transmission device (151).

A storage chamber (21) is formed above the drying chamber (11) and communicated with the storage chamber (21), and a ceiling plate (23) and a transfer gutter equipped with a transfer spiral are provided above the storage chamber 0'+1. (2
3. A supply port for supplying the transferred grains into this storage chamber +211 is provided in the center, and below this supply port is the storage chamber 21).
This configuration includes a diffusion plate 24+ that uniformly diffuses and returns grains inside.

Grain raising machine? 9 is provided in the front part of the front wall plate, and a packet conveyor T2G belt is stretched between the upper and lower pulleys inside, and a dispensing tube (5) is installed between the upper end and the transfer gutter (starting end of 0). A supply gutter 121 is provided between the lower end and the terminal end of the grain collecting gutter t+61 to communicate with each other, and a motor (291 is provided above the grain hoist 129), In the packet conveyor four belts, the transfer gutter (to)
It is configured to rotate the grain collecting trough (the transfer spiral in the pronator, etc.) via the inner transfer spiral, the spreading plate Q/D, and the packet conveyor belt, and the upper and lower directions are approximately in the center. is equipped with a moisture sensor 001 that receives grains that fall while being conveyed to the upper part of the packet conveyor (2S), crushes the grains under pressure, and simultaneously detects the moisture content of the crushed grains. is configured to be rotated by an internally provided motor 0υ.

The operating device (7) is box-shaped, and the surface plate of the box body includes a start switch (b) for starting the dryer (5) and a stop operation for each operation of loading, drying and discharging. A stop switch 03, which sets the temperature of the hot air generated from the burner (1) according to the operating position (b)
, the moisture setting setting Oe where the finishing target moisture is set depending on the operating position, the grain moisture detected by the moisture sensor 0[D, the hot air temperature detected by the hot air temperature sensor (3), the remaining drying time, etc. It has a display window OQ and a monitor display, etc., and an outside air temperature sensor (4) that detects the outside air temperature is installed on the outside of the lower plate, and inside there is a drying control device (2) and a combustion circulation control device (2). Each setting (B), (To), and 09 is a rotary switch type, and a predetermined value is set depending on the operating position.

The combustion circulation control device (to) includes each of the hot air temperature sensors (
3), an AD converter (g) that converts the detection values detected by the outside air temperature sensor (4) and the air volume sensor CIj from AD to AD;
An input circuit f411 to which the converted value converted by this A-D converter is input, an input circuit 6 to which the operation for each temperature setting (b) is input, and each of these input circuits @1), ( CPU f43. which performs arithmetic and logical operations and comparison operations on various input values input from This CPU (in an output circuit that receives and outputs various commands from the CPU 43) is provided.

The drying control device includes an A-D converter that converts a detection value detected by the moisture sensor C1[D into an A-D converter;
An input circuit into which the converted value converted by the converter is input, an input circuit into which the operations of the switches (to) 03 and the moisture setting switch 09 are input, and various input values input from these input circuits. The CPU f43. performs arithmetic and logical operations, comparison operations, etc. The configuration includes an output circuit that receives various commands from this CPU (43) and outputs them.

Combustion control and grain circulation control by the combustion circulation control device (to) are performed as follows, and the average value (TBI) of the hot air temperature (TB) detected by each hot air temperature sensor (3) is ) and the heating temperature variation (TW) based on the outside air temperature (TA) are set and stored in the CPUH3 of this combustion circulation control device (to) using the following formula (
It is a structure that is calculated by substituting into (b).

Heating temperature variation (TV) = C hot air temperature maximum value + (TB
2) - Minimum hot air temperature (TB3)) / [Average hot air temperature (TBI) - Outside air temperature (TA)) , the CPU! 0, for example, a heating temperature variation (TWI) of 60% that has been set and stored,
When the calculated heating temperature variation (TW) is 60% or less of the set memorized oil temperature variation (TWI), the hot air temperature (TB) is not changed and controlled, and the calculated heating temperature variation (TV) increases as the drying of the grain progresses. is calculated to be 80%, and if the set memorized oil temperature variation (TWI) is 60% or more, as shown in Fig. 2, the temperature at which the hot air temperature (TB) decreases (TE) set and stored in the C:PUG43 is is selected as 2℃, and the hot air temperature (TB) is 55℃, this 55℃
This C
PU! 43, and the average value ( TB, 1) are compared, and if they are different, the number of times the fuel valve is opened and closed is controlled so that the temperatures are the same, and the amount of fuel sucked by the fuel pump (9) is controlled.

Also, as mentioned above, the calculated heating temperature variation (TW) is calculated to be 80%, which is 60% of the set memory heating temperature variation (TWl).
In the above case, at the same time as the temperature control, the CPU [
Drying energy (K) is calculated by the following formula (b) set and stored in 43, and in order to make this calculated drying energy (K) the same, the circulation amount of grain is controlled, For example, the dry grain amount (W) is 3.6 tons, and the air volume (M) detected by the air volume sensor (49) is 0.3 tons.
6rn'/see, circulation amount (H) is 4.0t
on/hr, the hot air temperature (TB) detected by the hot air temperature sensor (3) is 55°C, and α is the specific heat of air
It is the specific weight of air, and based on these, 792
The configuration is calculated as 00αKcal/hr, and drying energy (K) = hot air temperature (TB) x air volume (M)
× αX Circulation amount (H) / Dry grain amount (W)... (B) Drying energy (K) = 55X0.36X a X3
600X4. O/3.6 Drying energy (K) = 79200akcal/hr
This calculated drying energy (K) 79200 akca
In order to make it the same as l/hr, the hot air temperature (TB
) is controlled at 53°C, and the air flow rate (M) detected by the air flow sensor (g) is 0.30 rn''/sec, the circulation amount of grains is 5.0 ton/sec according to the following formula ())). hr, calculated energy (K) 79200α = hot air temperature (T
B) - Decreasing temperature (TE) x air volume (M) x circulation volume (H)/
Dry grain amount (W)...(c)79200α= (55
-2) xo, 30x circulation amount (H) / 3.6 Circulation amount (H) = 4.98 valve 5.0ton/hr Grain circulation amount (H) 4.0ton/hr is calculated from this calculated grain circulation amount ( H) The speed change motor (19) which rotationally drives the delivery valve (m) has a rotational speed of 170 Or, p, m, 2125 r, p so that the rotation speed is 5.0 ton/hr.
, m rotations, the CPUf43 performs accelerated rotation control, and if the calculated heating temperature variation (TV) of the burner (11) is greater than or equal to the set memory heating temperature variation (TWI), the hot air temperature (TB ) is controlled to a predetermined low temperature, and at the same time, the grain circulation amount (H) is increased by a predetermined amount to dry the grains.

The drying control by the drying control device (9) is performed as follows. When the moisture sensor 0Φ detects the same grain moisture as the finishing target moisture set by operating the moisture setting controller 09, this The dryer (5) is automatically controlled by a drying control device to automatically stop the dryer (5).

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

Each setting of the operating device (7) (b), C341, O'j
Each part of the grain dryer (5), by operating the start switch to start the drying operation
The burner (11 and moisture sensor On, etc.) are started, and hot air is generated from this burner 111. This hot air is ventilated from the hot air chamber fl+3 to the drying chamber (2), and is passed through the exhaust chamber (through the air exhaust
3), the grains accommodated in the storage chamber 1211 of this dryer (5) are transported to this storage chamber +21.
It is exposed to this hot air and dried while flowing down from the drying chamber (2) from 1 to the drying chamber (2), and is fed to the lower part at the feeding valve (171) and is supplied to the grain collection gutter (IGI).
The grains are transferred from the feeder via the supply gutter Ql to the grain raising machine by the lower transfer spiral, transported to the upper part by the packet conveyor (c), passed through the dispensing tube (5), and are supplied into the transfer gutter (to). It is transferred and supplied from the gutter (to) onto the diffusion plate Q4 by the upper transfer spiral, and in this diffusion plate (241) it is evenly diffused and reduced into the storage chamber G!
When the dryer (5) is automatically controlled by the drying control device (supply) of the operating device (7) when the grain moisture content is the same as the finishing target moisture set by operating the moisture setting device 09, the dryer (5) is automatically controlled. Automatically stop.

During this drying work, the hot air temperature generated from the burner fil is detected by each hot air temperature sensor (3), and the outside air temperature is detected by the outside air temperature sensor (4), and based on these detected hot air temperature and detected outside air temperature, The heating temperature dispersion of the burner (1) is calculated, and when this calculated dispersion exceeds the predetermined heating temperature dispersion that has been set and stored, the temperature of the hot air generated from the burner (1) reaches the predetermined temperature. At the same time, the temperature is controlled to be low by the combustion circulation control device, and at the same time, the amount of circulating grains fed out and flowing down by the feeding valve (m) is controlled to increase by a predetermined amount, and the grains are dried.

[Brief explanation of drawings]

The figures show one embodiment of the present invention. Fig. 1 is a block diagram, Fig. 2 is a relationship diagram between pre-temperature variation and hot air reduction temperature, and Fig. 3 is a partially breakable grain dryer. Overall side view,
Figure 4 is a sectional view taken along line A-A in Figure 3, and Figure 5 is a cross-sectional view taken along line B-- in Figure 3.
B is a sectional view, FIG. 6 is an overall rear view of the grain dryer, and FIG. 7 is an enlarged front view of a part of the grain dryer with a partial cutaway. In the figure, reference numeral (1) indicates a burner, (2) indicates a drying chamber, (3) indicates a hot air temperature sensor, and (4) indicates an outside air temperature sensor.

Claims (1)

[Claims] A drying chamber (2) in which grains are dried by circulating hot air from a burner (1) while circulating the grains, and this drying chamber (2).
Hot air temperature sensor (3) that detects the temperature of hot air flowing into
In a grain dryer that is equipped with a plurality of external air temperature sensors (4) and an external air temperature sensor (4) that detects the external air temperature, the hot air temperature detected by the hot air temperature sensor (3) and the external air temperature sensor (4) are
) based on the outside temperature detected by the burner (1).
The drying method is characterized in that while calculating the variation in heating temperature due to the heating temperature, when the calculated variation reaches a predetermined range or more, the hot air temperature is automatically lowered and at the same time the circulating grain amount is controlled to increase. Drying control method.