JPH02203188A - Drying control method of grain dryer - Google Patents

Abstract

PURPOSE:To make drying operation easy in order to prevent a quality deterioration of grains due to mis-operation, by a method wherein three operation modes, ventilation-hot air combination drying mode, hot air combination drying mode, and hot air drying mode, are switched over by a turn-over device to perform the drying control. CONSTITUTION:The drying control is performed by a drying controller 35 in such a manner that a target final moisture content is set by turning a knob 32, and a dryer is automatically stopped by the controller 35 to finish drying of the grains when a moisture sensor 26 detects the grain moisture content same as the target moisture content. For example, when a turn-over device 31 is pushed once and a drying operation start-up switch is turned on, the ventilation-hot air combination drying mode set and stored in a CPU 40 of the drying controller 35 is selected and drying operation starts. By pushing the turn-over device 31 twice, the hot air combination drying mode is selected and drying operation starts. By pushing the turning-over device 31 three times, hot air drying mode is selected and drying operation starts.

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, drying modes were selected by combining various work conditions, such as ventilation drying using outside air, initial hot air drying using heated air from a burner, constant temperature hot air drying, and pause for temporarily stopping drying. The method was to dry grain by setting the working time for each mode of operation.

Problem to be Solved by the Invention In this method, when starting the drying of grains, a combination drying mode is selected, and the working time is set for each operation in the selected drying mode to start drying. , select the drying mode of initial hot air drying, pause, and constant temperature hot air drying, set the times for these ventilation drying, initial hot air drying, pause, and constant temperature hot air drying, and start drying. The grains are dried while being exposed to the blown outside air, and after a predetermined time has elapsed, hot air for initial hot drying is generated from the burner, and the grains are exposed to this hot air as they repeatedly circulate downward in the drying chamber. After drying, the hot air generated from the burner is stopped and the drying is paused.5 When the set predetermined time has elapsed, hot air for constant temperature hot air drying is generated from the burner and the drying is carried out by this hot air. The grains that are repeatedly circulated downward in the drying chamber are exposed and dried, and when a set predetermined time has elapsed, the hot air generated from the burner is stopped and the drying of the grains is stopped.

Automatically selects the drying mode based on this drying combination,
It also attempts to automatically set the working time for each task.

Means for Solving the Problems This invention provides ventilation drying by blowing outside air, initial hot air drying by heating air from a burner, pause for temporarily stopping drying,
A drying control system for a grain dryer is characterized in that drying is controlled by switching to a hot air drying mode for drying using heated air from the burner by switching operation of a switching device.

When a predetermined drying mode is selected by operating the action switching device of the invention and, for example, a ventilation hot air combination drying mode is selected by operating the switching device, when drying of grains is started, the grains are repeatedly circulated in the drying chamber. The grains are ventilated and dried by being exposed to outside air, and after a predetermined period of time, a burner generates hot air for initial hot drying, and the grains are exposed to this hot air and repeatedly circulated in the drying chamber. When a predetermined period of time has elapsed, the hot air generated from the burner is stopped and drying of the grains is paused, and when this pause has elapsed for a predetermined period of time, constant temperature hot air is generated from the burner, and this hot air is used to dry the grains. The grains that are repeatedly circulated downstream in the room are exposed and dried, and when the moisture content of the grains reaches the finishing target moisture content and a predetermined time has elapsed, the hot air generated from the burner is stopped and the drying of the grains is stopped. Ru.

Effects of the invention By automatically setting the time for each industry and drying the grains, the drying operation becomes easier and there is no possibility of erroneous operation, which reduces the possibility of deterioration of grain quality due to erroneous operation. It was prevented.

In the example, it should be noted that (1) is a grain dryer, and this drying is carried out at 41! Model (2) of (1) 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, and this front wall plate has an operating device 21 (
3) and a burner (4) inside the burner case (5), and the rear wall plate is equipped with an exhaust air a (6) and a motor (7). 5) A fuel pump (8) having a fuel valve is provided on the outside of the lower plate, and by opening and closing this fuel valve, the fuel pump (8) sucks the fuel in the fuel tank (9) and supplies it to the burner (4). A blower (10) and a variable speed motor (11) are provided on the outside of the upper plate, and the rotation of the variable speed motor (11) drives the air blower a (10) once to match the amount of fuel supplied. It is configured to supply combustion air to the burner (4).

A grain collection gutter (12) equipped with a transfer spiral in the front and rear direction is installed in the center of the lower part of the model (2).
) On the upper side, drying chambers (13) formed between ventilation networks are arranged in parallel and communicated with each other, and in the lower part of this drying chamber (13), a feeding valve (14) that feeds out the grains by rotation and flows down is mounted on a shaft. A hot air chamber (
15) to communicate with the burner (4), and a hot air temperature sensor (27) for detecting the hot air temperature is provided in the hot air chamber (15), and each drying chamber is connected to the burner (4). (
13) An exhaust chamber (16) is formed on the outside and the exhaust fan (6)
), and the motor (7) rotationally drives each of the delivery valves (10, the transfer spiral, the exhaust fan (6), etc.).

A storage chamber (28) is formed above each of the drying chambers (13) and communicated with each other, and a ceiling plate (17) is formed above the storage chamber (28).
A transfer gutter (18) equipped with a transfer spiral is provided in the center of the transfer gutter (18), and the transferred grain is transferred to the storage chamber (28).
A diffusion plate (19) is provided below this supply port, and this diffusion plate (18) supplies the storage chamber (2).
8) It has a structure that evenly diffuses and returns grains inside.

, the grain raising machine (20) is installed in the front part of the front wall plate, and inside the packet conveyor (21) belt is stretched between the upper and lower pulleys, and between the upper end and the starting end of the transfer gutter (1B). A dispensing tube (22) is provided in and communicated with the lower end and the grain collection gutter (12).
) A supply gutter (23) is provided between the grain hoist (20) and the terminal end for communication, and a motor (20
is provided, and this motor (24) drives the packet conveyor (2).
1) It is configured to rotationally drive the belt, the transfer spiral in the transfer gutter (18), the spreader plate (IS), etc., and the packet conveyor (21) is located at the center in the vertical direction. A motor (25) that receives grains falling on the ground, crushes the grains under pressure, and detects moisture in the crushed grains at the same time.
This configuration includes a moisture sensor (2B) with a built-in moisture sensor (2B).

The operation device al (3) is box-shaped, and on the surface plate of the box there are start switches (29) for starting the dryer (1) for each task, and stop switches (30) for stopping the dryer (1).
), a switching device t for switching and setting the drying mode (31)
, a moisture setting knob (32) for setting the finishing target moisture content of grains according to the operation position, each hot air temperature sensor (33) for setting the temperature of the hot air generated from the burner (4) according to the operation position, and the moisture sensor ( A display window (30) and a monitor display are provided to alternately display the detected hot air temperature detected by the hot air temperature sensor (27) and the remaining time, etc., and a drying control device is installed inside! ! (3
5) and combustion control device 1 (3B), each setting knob (32), (33) is a rotary switch type, and a predetermined value is set depending on the operating position. Switching equipment! ! (31) is a toggle switch type, and a predetermined drying mode is selected depending on the number of operations.

The drying control device 1 (35) includes the moisture sensor (26)
An A-D converter (3?) that converts the detected value detected by the
), an input circuit (38) into which the converted value converted by this A-D converter (37) is input, and each of the switches (29).
, (30), an input circuit (39) into which the operation of the switching device (31) and the moisture setting adjustment (32) is input, and various input values input from each of these input circuits (38) and (39). The CPU (4) performs arithmetic and logical operations and comparison operations.
0), and an output circuit (41) that receives and outputs various commands from the CPtJ (40).

The combustion control device! ! (38) is an A-to-digital converter that converts the detected value detected by the hot air temperature sensor (27), and an input circuit 5 to which the converted value converted by the A-to-digital converter is input. An input circuit into which the operation of the hot air temperature setting socket (33) is input, and the CP which performs arithmetic and logical operations, comparison operations, etc. on various input values input from these input circuits.
U (40) is configured to include an output circuit that receives and outputs various commands from the CPU (40).

The drying control device! ! The drying control according to (35) is performed by the drying control device (35) when the moisture sensor (26) detects the same grain moisture as the finishing target moisture set by operating the moisture setting knob (32). The structure is such that the drying 41(1) is automatically stopped to stop the drying of grains through automatic control, and for example, the switching device t (31) is pressed once to start the drying operation. switch(
This configuration is such that when the operation 29) is performed, drying is started. Ventilation drying by outside air is carried out for one hour, and after this one hour, hot air whose temperature is 10 degrees lower than the set hot air temperature set by operating each of the hot air temperature sensors (33) is generated from the burner (4). , initial hot air drying is carried out for 2 hours, after these 2 hours, the dryer (1) is stopped for 1 hour, and after this 1 hour, each hot air temperature setting sprayer (33) is operated. When grain moisture equal to the set finishing target moisture is detected, the drying control device (35) automatically controls and automatically stops the dryer (1).

For example, when the switching device (31) is pressed twice and the starting switch 2,000 (29) is operated to start the drying operation, the drying control device i! The hot air set set and stored in the CPU (40) of (35) The hot air whose temperature is 10 degrees lower than the set hot air temperature set by operating each hot air temperature setting knob (33) is sent to the burner (4). The initial hot air drying is carried out for 2 hours, and after this 2 hours, the dryer (1) is stopped for 1 hour,
After one hour, when each hot air temperature setting switch (33) is operated and the grain moisture content is the same as the set finishing target moisture content, the drying controller I (35) automatically controls the drying machine. (1) is configured to automatically stop.

For example, when the switching device (31) is pressed three times and the start switch (29) is operated to start the drying operation, the CP of the drying control device (35)
Heat set and stored in U (40) ↓ Air drying mode is selected and drying begins. When the set hot air temperature set by operating each of the hot air temperature sensors (33) is generated from the burner (4) and grain moisture equal to the set finishing target moisture is detected, the drying control device (3)
5), the drying process 41 (1) is automatically stopped.

The combustion control by the combustion control device (36) compares the detected hot air temperature detected by the hot air temperature sensor (27) with a set hot air temperature set by operating each of the hot air temperature sensors (33), If they are different, the number of times the fuel valve is opened and closed is controlled so that the hot air temperature is the same as the set hot air temperature, and the amount of fuel sucked by the fuel pump (8) is controlled to flow into the burner (4). This is the configuration provided.

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

Control device! Each setting of (3) (32), ('33)
When the drying operation is started by pressing the switching device (31) once and operating the start switch (29) to start drying, the 5-air hot air combination mode is selected and the grain At the same time as the dryer (1) starts, the moisture sensor (2B) starts, and the outside air is sucked in by the exhaust fan (6) to ventilate the drying room (13) from the hot air chamber (15). The drying chamber (13) is drawn from the storage chamber (28) by being sucked and exhausted by the exhaust fan (6) through the chamber (18).
) The grains flowing down are exposed to this outside air and dried,
The grain is delivered to the lower part by the delivery valve (14) and flows down from the collecting trough (12) to the supply trough (23), into the shell raiser (20) by the lower transfer spiral, and is then fed to the packet conveyor (2).
1), it is conveyed to the upper part \ and passes through the dispensing tube (22) to the transfer gutter (1).
B) and from this transfer gutter (18) to the diffusion plate (1
9) is fed upward by the upper transfer spiral, and this expansion [1(
19), it is evenly diffused and reduced into this storage chamber (28),
When a predetermined period of time has elapsed while being circulated and dried, hot air having a predetermined temperature lower than the set hot air temperature set by operating each hot air temperature setting knob (33) is generated from the burner (4), and the hot air is exposed to this hot air. When a predetermined period of time has elapsed while initial hot air drying is being carried out, the dryer (1) is stopped for a predetermined period of time, and after this predetermined period of time has passed, each hot air temperature setting ) is generated from the burner (4) and is exposed to this hot air to dry, and the moisture sensor (26) is set by operating the moisture setting indicator (32). When the grain moisture content that is the same as the finishing target moisture content is detected, the drying control device 1 (35) of the operating device (3) automatically controls the dryer (1) to stop the drying of the grains.

As shown in FIGS. 3 and 4, the dispensing tube (22) is provided with a circulation sensor (42) for detecting grains passing through the dispensing tube (22). Sensor (42
) is composed of an actuator (43) that rotates with passing grains and a switch (44) that is turned on and off by the rotation of this seven cutter (43).
) is in the ON state, it is detected that the grain is in the @ position, and in the OFF state, it is detected that the grain is not circulating.
2) The inner wall of the front wall plate is provided with a plurality of filling amount sensors (45) in the vertical direction for detecting the grains placed into the storage chamber (28). Filling sensor (4
5) enters the ON state when pressed by the grain, and in this ON state, it is detected that the grain is staked up to the ON state, and it is detected that the grain is not staked at the OFF state. This is the configuration for detection.

The discharge work is started by operating the start switch (28) that starts the discharge work, and during this discharge work, the switch (44) of the circulation sensor (42) is turned off, and this turned off state is Simultaneously with the input to the drying control device t (35), each of the filling amount sensors (45) turns off, and when this off state is input to the drying control device (35),
It is configured to detect that the grains in the dryer (1) are discharged outside the machine and the discharge operation is completed, and upon this detection, the drying control device (35) automatically controls the operation of the dryer (1).
It is configured to automatically stop.

When performing a discharge operation to discharge the grains in the dryer (1) to the outside, the drying operation is started by operating the start switch (28) of the operating device (3) that starts the discharge operation. When the machine (1) is started and the on-off valve at the bottom of the transfer gutter (18) is opened, the grains are discharged to the outside of the machine through the discharge funnel (46) and the discharge tube (47), (42) and each of the loading amount sensors (45) no longer detect grains, it is detected that the discharge work has been completed, and the drying control device (35) of the operating device (3) automatically controls the grains. Automatically stop the dryer (1).

As a result, the discharging work is not considered to be complete unless the sensors (42) and (45) of both devices stop detecting grains, which greatly reduces the possibility of false detection that the discharging process is completed during the process of discharging. did.

In this embodiment, a dedicated switching device 31 is provided as means for switching the dryer mode, but there is also a start switch 29 for drying and a preset reservation switch, that is, a selection of whether or not to include a drying pause during the drying process. For example, if switch 29 is turned on and the reservation switch is turned on to select ventilation/hot air combination drying mode A, while drying mode A is in progress, the drying mode may be selected.
When the drying mode switch is turned on, the process shifts to drying mode B in which hot air drying and pauses are repeated. Further, when the reservation switch is turned on again, the mode shifts to hot air drying mode C, which continues hot air drying without entering a pause state. (Figure 7)

[Brief explanation of the drawing]

The figures show one embodiment of the present invention, in which Fig. 1 is a block diagram, Fig. 2 is a flowchart, Fig. 3 is an overall side view of the dryer that can be partially cut away, and Fig. 4 is Fig. 3. Figure 5 is an enlarged front view of a part of the dryer that can be partially cut away.
FIG. 6 is a flowchart of the discharge operation, and FIG. 7 is a flowchart of another embodiment. In M, code (1) is the grain dryer, (3) is the operating device, (
31) indicates a switching device.

Claims (1)

[Claims] A ventilation/hot air combination drying mode A in which the grains are dried in the order of ventilation drying using outside air, initial hot air drying using heated air from a burner, pause for temporarily suspending drying, and reheated air drying using heated air from the burner; Switching the switching device between a hot air combination drying mode B in which the grains are dried in the order of repeating the initial hot air drying, the pause, and the reheated air drying, and a hot air drying mode C in which the grains are dried only by the hot air drying. A drying control system for a grain dryer characterized by controlling drying by switching depending on the operation.