JPH03113282A - Dry control system for grain dryer - Google Patents

Abstract

PURPOSE:To reduce cost by comparing the differential temperature between the temperature of draft on a feed side and a discharge side which passes through a drying chamber with the temperature of grains in the drying chamber and halting the drying operation when the temperature of grain exceeds a specified temperature and eliminating the need for a circulation sensor. CONSTITUTION:During drying operation, a hot air temperature sensor 13 detects the temperature of hot air in a hot air chamber 12 while an exhausted air temperature sensor 15 detects the temperature of exhausted air in an exhausted air chamber 14. The differential temperature between the detected hot air temperature and the detected exhausted air temperature is calculated. The temperature of grains in a drying chamber 1 is detected by a grain temperature sensor 11 and the detected grain temperature is compared with the aforesaid differential temperature. When the detected grain temperature exceeds a specified temperature, it is detected that the grains fail to circulate so that the hot air generated from a burner may be suspended. As a result, the drying operation is switched over to draft drying induced by open air to be sucked and exhausted by an exhauster 7 and the grains are dried.

Description

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

2. Description of the Related Art Conventionally, temperature sensors detect the temperatures on the inlet and outlet sides of hot air passing through a drying chamber, and temperature sensors detect the temperature of grains flowing down the drying chamber.

A circulation sensor for detecting the circulation of grains circulating in the drying chamber is separately provided, and the hot air temperature and grain temperature are controlled by the temperature detected by each of these temperature sensors, and when the circulation sensor no longer detects circulating grains. This was a drying control method in which the hot air was stopped and the process was switched to ventilation drying using outside air.

Problems to be Solved by the Invention The hot air temperature is controlled by comparing the detected temperature on the inlet side of the hot air that crosses the drying room with a set hot air temperature, and the detected temperature on the discharge side and the set grain temperature are compared. The detected grain temperature of the grains in the drying chamber is compared with the set grain temperature to control the grain temperature, and further, when the circulation sensor no longer detects circulating grains, The hot air is stopped and the grains are dried by switching from hot air drying to ventilation drying using outside air.

During this drying process, whether or not the grains are circulating is detected based on the detected temperatures on the hot air inlet and outlet sides and the detected grain temperature, thereby eliminating the need for circulation sensors and reducing costs. be.

Means for Solving the Problems This invention provides a grain dryer that is provided to dry grains by blowing hot air through them while letting them flow into a drying chamber (1). The temperature difference between the temperature on the feeding side and the temperature on the discharge side is compared with the grain temperature in this drying chamber (1), and when the grain temperature is higher than a predetermined value, drying is stopped. The structure is a drying control method.

Effect of the Invention In the drying chamber, the detected temperature on the hot air supply side and the set hot air temperature are compared in 1) to control the hot air temperature.

The detected temperature on the discharge side is compared with a set grain temperature to control the grain temperature, and the detected grain temperature of the grain in the drying chamber is compared with the set grain temperature to control the grain temperature. Furthermore, the temperature difference between the detected temperature on the feeding side and the detected temperature on the discharge side is calculated, and the temperature difference obtained by this calculation is compared with the detected grain temperature. If the detected grain temperature is higher than a predetermined value, the drying It is detected that the grains are not circulating in the chamber (1) but are in a stopped state, and in accordance with this detection, the hot air is controlled to stop, and the grains are dried by switching from hot air drying to ventilation drying using outside air. Ru.

Effects of the Invention According to this invention, the temperature difference between the inlet side and the outlet side of the hot air that crosses the drying chamber (1) is compared with the detected grain temperature in the drying chamber (1), and the detected grain When the temperature is higher than a predetermined value, it is detected that the grains are not circulating in the drying chamber (1), so the circulation sensor can be discontinued, and the grains to be dried are not high in moisture. Therefore, even when the grain temperature rises slowly, the temperature difference is detected from the hot air inlet side and the hot air outlet side, and by comparing this temperature difference and determining circulation, the grain temperature can be determined. Accurate circulation judgment can be made even when the rise in the temperature is slow.

Example In addition, in the rotation, (2) is a grain dryer.

The mechanism (3) of this dryer (2) has a rectangular shape that is long in the front and back direction and consists of one front and rear wall plate and a left and right wall plate, and this front wall plate has an operating device for starting and stopping the dryer (2). (4
) and a burner case (6) containing a burner (5) therein, and the rear wall plate is provided with an exhaust fan (7) and a motor (8).

In the center of the lower part of the mechanism (3), there is a grain collection gutter (9) with a transfer spiral mounted on the shaft in the front and back direction, and on the upper side of the grain collection gutter (9) there is a drying chamber (1) between the ventilation nets. These drying chambers (1) are arranged in parallel and communicated with each other, and each drying chamber (1) has a feed-out valve (III) installed in the lower part of the drying chamber (1) that feeds out the grains. (1) A grain temperature sensor 01) that detects the temperature of the grain flowing down inside the drying chamber (1) is installed in a state where it is not affected by the hot air that crosses the drying chamber (1), and each of these drying chambers (1) A hot air chamber 0δ is formed between the inner sides, and the hot air chamber Ob and the burner (5) are configured to communicate with each other, and the hot air temperature in the hot air chamber Ub is detected within the hot air chamber. A hot air temperature sensor (13) is provided, an exhaust chamber A4 is formed outside each drying chamber (1), and each exhaust chamber 04 and the exhaust fan (7) are communicated with each other. The exhaust chamber (2) is provided with an exhaust air temperature sensor (19) for detecting the temperature of the exhaust air inside the exhaust chamber (2), and the motor (8) moves the transfer spiral, Each delivery valve (I
This is a configuration in which the exhaust fan (7) and the like are rotationally driven.

The upper side of each drying room (1) forms and communicates a storage chamber aS, and the upper side of this storage room OFA is provided with a ceiling plate (m) and a transfer gutter 011 equipped with a transfer spiral. A supply port is provided in the storage chamber tIS for supplying the transferred grains into the storage chamber tIS, and a diffusion plate is provided below the supply port to uniformly diffuse and return the grains into the storage chamber OQ. It is the composition.

The grain elevating machine 21m is installed in the front part of the front wall plate, and a packet conveyor 121 is installed inside the belt stretched between the upper and lower pulleys. A pipe Qδ is provided for communication, and a supply gutter (to) is provided between the lower end and the terminal end of the grain collecting gutter (9) for communication, and the upper part of the grain elevator (to) is connected to the feed gutter (to) for communication. A motor Q4 is provided, and this motor (at 241 the packet conveyor C211 belt,
The transfer spiral and the spreading plate (11, etc.) in the transfer gutter C18 are rotatably driven, and the packet conveyor 31 is located at the center in the vertical direction to receive grains that fall while being conveyed to the upper part. At the same time as the grains are crushed under pressure, a moisture sensor (a) equipped with a motor (c) for detecting the moisture content of the crushed grains is provided.

A fuel pump (5) having a fuel valve is provided on the outside of the lower plate of the burner case (6), and when the fuel valve is opened and closed, the fuel pump (5) sucks the fuel in the fuel tank (to) and It is configured to supply fuel to the burner (5), and a blower (to) and a variable speed motor (to) are provided on the outside of the upper plate, and this blower (to) is driven to rotate by the rotation of the variable speed motor OI, and the amount of fuel supplied is The combustion air is supplied to the burner (5) in an appropriate amount.

The operating device (4) is box-shaped, and on the surface plate of the box are each a start switch OD for starting the dryer (2) for each operation of loading, drying and discharging, and the dryer (2). ) to set the temperature of the hot air generated from the burner (5), grain type setting (0) and tensioning amount setting (2), moisture to set the grain finishing target moisture. A display window (to) and a monitor display for displaying settings, hot air temperature, grain moisture, remaining drying time, etc. are provided, and a drying control device (b) and a hot air control device (to) are installed inside. , and the respective settings 03° (to), 09 are rotary switch type, and these settings 03° (to), (b),
The configuration is such that the hot air temperature and finishing target moisture content are set depending on the operating position of C1g.

The hot air control device (to) is an A-D converter (to) that converts detected values detected by the grain temperature sensor 0υ, the hot air temperature sensor 03, and the exhaust air temperature sensor 04 from analog to digital.

Between the input circuit (a) to which the converted value converted by this A-D converter (to) is input, and the input circuit to which the operation of each setting is input, ), a CPU II+5 that performs arithmetic and logical operations and comparison operations on various input values input from the CPU II+5, and an output circuit (43) that receives various commands from the CPU and outputs them. .

The drying control device (5) includes an A-D converter that converts the detection value detected by the moisture sensor C2Q into A-D, and this A-D converter.
An input circuit into which the converted value converted by the D converter is input, each of the switches Gυ, and the moisture setting switch.
The input circuit to which operations are input, the CPU@7J which performs arithmetic and logical operations, comparison operations, etc. on various input values input from these input circuits, receives various commands from this CPU@a and outputs them. This configuration includes an output circuit.

The hot air control and grain circulation control by the hot air control device (to) are the detected hot air temperature (TB) detected by the hot air temperature sensor 03 and the detected exhaust air temperature (TE) detected by the exhaust air temperature sensor a9. This hot air control device (to)
This temperature difference is compared with the detected grain temperature (TG) detected by the grain temperature sensor T1m), and this detected grain temperature (TG) is calculated by
If TG) is, for example, a temperature equal to or higher than the intermediate position of the temperature difference set and stored in the CPU@7a, the grains being dried are not circulating in the dryer (2) and are in a stopped state. By detecting the stoppage of circulation of the grains, the hot air drying by the hot air generated from the burner (5) is controlled to stop.

It is configured to switch to ventilation drying using outside air, and if the temperature is below the intermediate position, the grains being dried will be removed from the dryer (
2) The configuration is such that hot air drying is continued when the hot air is detected to be circulating inside the air, and the detected hot air temperature (TB) and each of the settings described above are adjusted. Q4) is compared with the set hot air temperature set by operating Q4), and if there is a difference, 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, and the fuel pump (a) This is a configuration in which the amount of fuel sucked and supplied is controlled.

Also, the detected grain temperature (TG) detected by the grain temperature sensor (11)
is set and stored in the CPU 12) and compared with the set grain temperature, and if the detected grain temperature (TG) is higher, for example, the set hot air temperature is set and stored in the CPU 12). The detected exhaust air temperature (TE) detected by the exhaust air temperature sensor (19) is compared with the detected grain temperature (TG) detected by the grain temperature sensor (I+), and the detected From the exhaust air temperature (TE detected grain temperature (TG)), the CPU
If the temperature is higher than the 5° C. set and stored in Iδ, the set hot air temperature is lowered by the 2° C. set and stored in the CPUGI2).

The drying control by the drying control device is such that when the moisture sensor detects the same grain moisture as the finishing target moisture set by operating the moisture setting control Og, the drying control device (
B) is automatically controlled to automatically stop the dryer (2).

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

Operation bag [(4) Each setting wax ((3, (B), (to)) is operated to the specified position, and the start switch 0 starts the drying work.
By operating υ, the grain dryer (2), moisture sensor Qe, and burner (5) are started, and hot air is generated from this burner (5) and crosses the drying room (1) from the hot air chamber 0. Ventilated.

The grains are suctioned and exhausted by the exhaust fan (7) through the ventilation chamber α4, and are stored in the storage chamber (formerly) of the dryer (2) from this storage chamber (119) into the drying chamber (1). While flowing down, the grains are exposed to this hot air and dried, and are fed out to the lower part by the feeding valve (1) and flowed down to be supplied into the grain collection gutter (9).
) through the supply gutter (2) and into the grain hoist via the lower transfer spiral, transported to the upper part by the packet conveyor 121), and fed into the transfer gutter Oa via the dispensing tube (23), The transfer spiral in this transfer gutter 08 transfers and supplies the liquid from this transfer gutter (formerly) to the diffusion plate (Fit), where it is evenly diffused and reduced into the storage chamber (1119), and is circulated and dried. When the moisture sensor 12e detects the same grain moisture as the finishing target moisture set by operating the moisture setting, the drying is automatically controlled by the drying control device (b) of the operating device (4). Machine (2) will automatically stop.

During this drying work, the hot air temperature in the hot air chamber αδ is detected by the hot air temperature sensor 03, the exhaust air temperature in the exhaust air chamber 04 is detected by the exhaust air temperature sensor (19), and the detected hot air temperature (TB ) and the detected exhaust air temperature (TE) is calculated, the grain temperature in the drying chamber (1) is detected by the grain temperature sensor (11), and this temperature difference and the detected grain temperature (TG) are calculated. is compared, and if this detected grain temperature is higher than a predetermined value, it is detected that the grains are not circulating, the hot air generated from the burner (5) is stopped, and the outside air that is sucked and exhausted by the exhaust fan (7) is The grains are dried by switching to ventilation drying.

Note that an outside air temperature sensor is provided to detect outside air temperature, and the outside air temperature (TC) detected by this outside air temperature sensor and the detected hot air temperature (TB) detected by the hot air temperature sensor 03 are as follows.
and the detected exhaust air temperature detected by the exhaust air temperature sensor 09 (
The ratio (A) is calculated by substituting TE) into the following formula set and stored in the CPUl 121, and this ratio (A) is, for example, 0, which is set and stored in the CPUf 421.
If it is 5 or less, it is detected that the grains are not being circulated in the dryer (2), and upon this detection, the configuration may be configured to switch to ventilation drying.

Ratio (A) = Detected hot air temperature (TB) - Detected outside air temperature (T
C) /Detected hot air temperature (TB) -Detected exhaust air temperature (TE
) If it is 0.5 or more, it is detected that the grains are circulating in the dryer (2), and the hot air drying may be continued, whereby the circulation of the grains can be specially detected. This eliminates the need for a circulation sensor, making it impossible to reduce costs.

[Brief explanation of drawings]

The figures show one embodiment of the present invention, in which Figure 1 is a block diagram, Figures 2 and 3 are relationship diagrams of hot air temperature, exhaust air temperature, and grain temperature, and Figure 4 is a partially cutaway diagram. FIG. 5 is a sectional view taken along the line AA in FIG. 4, and FIG. 6 is an enlarged front view showing a part of the dryer in cross section. In the figure, code (1) is the drying room, OD is the grain temperature sensor, and (12
+ is hot air chamber, 03 is hot air temperature sensor, u4 is ventilation chamber, 0
9 indicates an exhaust air temperature sensor.

Claims (1)

[Claims] In a grain dryer installed to dry grains by blowing hot air through them while letting them flow into a drying chamber (1), the temperature on the inlet side and the temperature on the discharge side of the air passing through the drying chamber (1) are determined. Compare the temperature difference with the grain temperature in this drying chamber (1),
A drying control system configured to stop drying when the grain temperature is higher than a predetermined value.