JPH02143083A - Drying control system for grain drier - Google Patents

Abstract

PURPOSE:To permit stabilized drying without necessitating a long period of time for drying by a method wherein the drying is controlled by correcting the set temperature of hot air automatically based on an atmospheric humidity under high atmospheric humidity condition. CONSTITUTION:The control of hot air, which is effected by a hot air controller 38, is effected by a method wherein a hot air temperature, set in a CPU 42 and stored in the same, is selected and set based on the operating positions of a kind of grain setting knob 31 as well as a charging amount setting knob 32 and a detecting atmospheric temperature detected by an atmospheric temperature sensor 35. Further, the set hot air temperature is set by correcting it by a detecting atmospheric humidity detected by an atmospheric humidity sensor 36 while the drying of the grain is controlled by the corrected set temperature of hot air. The set hot air temperature is compared with the detecting hot air temperature detected by a hot air temperature sensor 12 and when these two values are different, the number of opening and closing of a fuel valve is controlled to control the amount of fuel, sucked and supplied by a fuel pump 25, so that the detecting hot air temperature becomes the same as the corrected set temperature of hot air.

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, the temperature of hot air generated from a burner was set using the outside air temperature and the amount of grain packed as drying conditions, and this set hot air temperature was generated from this burner, and the cycle was repeated for this set hot air. Drying control method in which the grains are exposed to dryness, and when the temperature of the grains rises to a predetermined temperature or higher during this drying, the set hot air temperature is controlled to drop to a predetermined low temperature and the grains are dried. Met.

Problems to be Solved by the Invention In the drying of grains, the outside air temperature at the time of drying is detected and inputted by an outside air temperature sensor, and the grains to be dried are
Err is detected and input, and the temperature of the hot air generated from the burner is set based on the input values of the outside air temperature and the amount of grain loaded.The set hot air temperature is generated from the burner and the set hot air is The grains that undergo repeated circulation are exposed to dryness, and when the temperature of the grains rises to a high temperature north of a predetermined temperature during this drying, the set hot air temperature is controlled to drop to a predetermined low temperature and the grains are dried. However, for this reason, when the amount of grain to be dried is small, the outside air temperature is high, and the outside air humidity is high, the temperature of the grains will start drying and it will take a relatively short period of time. If the temperature rises above a predetermined time, the set hot air temperature will be lowered to a lower temperature, and it will take a longer time to dry the grains, or the drying time will be longer. It was occurring that the number of cycles of the grains increased and this increased the damage of the grains.
This is an attempt to resolve these issues.

Means for Solving the Problems The present invention provides a grain dryer that sets the temperature of hot air generated from a burner (1) using the outside air temperature and the amount of grain loaded as drying conditions. The drying control method is characterized in that under certain conditions, drying is controlled by automatically making corrections based on the outside air humidity.

Effect of the Invention When drying grains, the outside air temperature at the time of drying is detected by an outside air temperature sensor and inputted, the amount of packed grain of the grains to be dried is detected and inputted, and the outside air humidity is also detected and inputted. The temperature of the hot air generated from the burner (1) is set based on the input values of the outside air temperature and the amount of grain loaded, which are detected by the outside air humidity sensor. 1. For example, when the humidity is high, the temperature is corrected to a high temperature, this corrected hot air temperature is generated from the burner (1), and the grains that are repeatedly circulated are exposed to this corrected hot air and dried, and during this drying, When the temperature of the grain rises to a high temperature higher than a predetermined temperature, the corrected hot air temperature is controlled to decrease to a predetermined low temperature and the grain is dried.

Effects of the Invention According to this invention, even when the outside air temperature is high and the outside air humidity is high, which requires a long time for grain drying, the preset hot air temperature is set to a high temperature when the humidity is high. Even if the temperature of the grains during drying becomes high and the corrected hot air temperature is controlled to drop to a predetermined low temperature, the absolute temperature is still high. Stable drying is possible without requiring a long time to dry the grains.

Example On the ward side, (2) is a grain dryer, and the machine wall (3) of this dryer (2) has a rectangular shape that is long in the front and rear direction, and consists of front and rear wall plates and left and right wall plates. The front wall plate is equipped with an operating device (4) for starting and stopping the dryer (2) and a burner case (6) containing a burner (1), and the rear wall plate is equipped with an exhaust fan. (7) and motor (8)
This is a configuration with a

A grain collection gutter (9) equipped with a transfer wheel is installed in the center of the lower part of the inside of the machine wall (3) in the front and back direction, and this grain collection 1 (9)
The drying chambers (5) are arranged in parallel on the upper side and communicated with each other, and the lower part of each drying chamber (5) is equipped with a feeding/lube (lO) that feeds out the grains and flows down. Room (5)
A hot air chamber (11) is formed between the inner sides, and this hot air chamber (11)
) and the burner (1) are configured to communicate with each other, and a hot air temperature sensor (12) is provided in the hot air chamber (11) to detect the hot air temperature within the hot air chamber (11). A ventilation chamber (I3) is formed outside each of the drying chambers (5), and each of the ventilation chambers (13) and the ventilation fan (7) are configured to communicate with each other, and the motor (8) The transfer spiral 2 is configured to rotationally drive the respective edge valves (10), the discharge machine (7), etc.

A storage chamber (14) is formed above each drying chamber (5) and communicated with the storage chamber (14), and a ceiling plate (15) and a transfer III! are formed above the storage chamber (14). A transfer gutter (16) equipped with a spindle is provided in the center of this transfer gutter (1G), and the transfer @ spindle is connected to this storage chamber (1G).
4) A supply port for supplying the grains into the storage chamber (14) is provided, and a diffusion plate (17) is provided below the supply port to uniformly diffuse and return the grains into the storage chamber (14).

The grain raising machine (18) is installed in the front part of the front wall board, and inside the packet conveyor (19) belt is stretched between the upper and lower pulleys, and between the upper end and the starting end of the transfer gutter (18). is provided with a discharging tube (20) to communicate with the lower end and the grain collection gutter (9).
) A supply m (21) is provided between the grain hoist (18) and the terminal end, and a motor (22
), and the motor (22) drives the packet conveyor (
19) It is configured to rotationally drive the belt, the transfer butterfly in the transfer gutter (16), the spreader plate (17), etc., and the packet conveyor (18) has two When the grains that fall during transportation to the department are crushed under pressure, a motor (2
3) is equipped with a moisture sensor (24).

A fuel pump (25) having a fuel valve is provided on the outer side of the lower plate of the burner case (6), and when the fuel valve is opened and closed, the fuel pump (25) sucks the fuel in the fuel tank (2B). It is configured to supply to the burner (1), and on the outside of the upper plate is a blower (27) and a variable speed motor (2).
The blower (27) is rotationally driven by the rotation of the variable speed motor (28), and combustion air commensurate with the amount of fuel to be supplied is supplied to the burner (1).

The operating device (4) is box-shaped, and on the surface plate of the box there are start switches (29) for starting the dryer (2) for each operation of loading, drying and discharging, and the dryer. (2
), a grain type setting switch (31) for setting a part of the temperature of the hot air generated from the burner (1), a staking 1 setting switch (32), a grain type setting switch (32) for setting a part of the hot air temperature generated from the burner (1), Moisture setting setting (33) to set the finishing target moisture, display window to display hot air temperature, grain moisture, remaining drying time, etc.
34) and a monitor display, etc., and on the outside of the lower plate there is an outside air temperature sensor (
35) and an outside air temperature sensor (36) for detecting outside air humidity to correct the set hot air temperature, and inside is a drying control device (37) and a hot air control device 1c38), Each setting (31), (32),
(33) is a rotary switch type, and a part of the 1M air temperature is set by the operating position of each setting knob (31) and (32), and the finishing target is determined by the operating position of the setting knob (33). This is a configuration in which moisture is set.

The hot air control device M (38) includes the hot air temperature sensor (1
2), an A-D converter (311) that converts the detected values detected by the outside air temperature sensor (35) and the outside air temperature sensor (36) from analog to digital; An input circuit (40) to which the converted values are input, an input circuit (41) to which the operations of the respective setting nodes (31) and (32) are input, and inputs from these input circuits (40) and (41). A CPU (42) that performs arithmetic and logical operations and comparison operations on various input values, and an output circuit (43) that receives various commands from the CPU (42) and outputs them.
This is a configuration with a

The drying control device (37) includes the moisture sensor (24)
an A-D converter that converts the detected value detected by the A-D converter, an input circuit into which the converted value converted by the A-D converter is input, each of the switches (28) and (30), and the moisture setting. The CPU (42) performs arithmetic and logical operations, comparison operations, etc. on various input values input from these input circuits.
2) has an output circuit that receives and outputs various commands.

Control of the hot air temperature by the hot air control device (38) is performed by controlling the grain type setting setting (31) and the pitching 1 setting setting (
Based on the three conditions of the operation position of the CPU (32) and the detected outside temperature detected by the outside temperature sensor (35), the CPU (4)
The hot air temperature set and stored in 2) is selected and set, and this set hot air temperature is further changed depending on the detected outside air humidity detected by the outside temperature sensor (36).For example, when the amount of grain to be dried is 4000 kg In the case of the dryer (2), the amount of loaded grain (
V) and detected outside air temperature (TA).
42), the temperature is corrected and set, and the drying of grains is controlled using this set corrected hot air temperature, and this set corrected hot air temperature and the hot air temperature sensor The detected hot air temperature detected by (12) is compared, and if there is a difference, the number of times the fuel valve is opened and closed is controlled so that the temperature becomes the same as the set corrected hot air temperature, and the fuel pump (25) is used to supply suction. The configuration is such that the amount of fuel #4 is controlled, and when the outside air temperature detected by the outside air temperature sensor (36) increases by 5°C during drying, the set hot air temperature changes to 2.
The configuration is such that the CPU (42) is set and stored so that the temperature rise is controlled.

The drying control device! The drying control according to (37) is performed when the moisture sensor (24) detects the same grain moisture as the finishing target moisture set by operating the moisture setting knob (33).
This drying control device (37) automatically controls the drying 1
! (2) is configured to automatically stop.

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

Each setting of the operating device (4) (31), (32), (3
3) to the specified position and the start switch (29) to start the drying operation, the grain dryer (2)
, the moisture sensor (24) and the burner (1) are started, and depending on the operation position of each set point (31), (32) and the detected outside air temperature detected by the outside air temperature sensor (35),
The hot air temperature generated from this burner (1) is set, and this set hot air temperature is further corrected and set by the detected outside air humidity detected by the outside air humidity sensor (3B), and this set corrected hot air temperature is set at this burner (1). 1), cross-ventilates from the hot air chamber (11) to the drying chamber (5), and then passes through the exhaust chamber (
] 3), the air is sucked and exhausted by the exhaust fan (7), and the air is removed from the dryer (
The grains stored in the storage chamber (14) of 2) are exposed to this hot air and dried while flowing down from the storage chamber (14) into the drying chamber (5), and then the grains are dried by the fj outlet valve (lO). The grain is fed out to the lower part, flows down, and is supplied into the grain collection gutter (9), and from this grain collection gutter (9), via the supply gutter (21), is transferred and supplied into the grain raising machine (18) by the lower transfer spiral. and the packet conveyor (1
9) and is transported to the upper part through the dispensing tube (20) and into the transfer gutter (1).
6) is supplied into the tank, and by the transfer spiral in this transfer gutter (16), it is transferred and supplied from this transfer gutter (18) onto the expansion 1ffi (x7), and into the storage chamber (14) by this diffusion plate (17). The moisture sensor (24) is evenly diffused and reduced and circulated and dried.
When the dryer (2) detects the same grain moisture as the finishing target moisture set by operating the moisture setting knob (33), it is automatically controlled by the drying control device (37) of the operating device (4). )
will stop automatically.

[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 temperature table for correcting heat M temperature based on outside air humidity, and Fig. 3 is an overall side view of the dryer partially cut away. , FIG. 4 is a cross-sectional view taken along the line A-A in FIG. 3, and FIG. 5 is an enlarged front view of a portion of the dryer, partially cut away. In the figure, code (1) is the burner, (5) is the drying chamber, and (35)
(36) shows an outside air temperature sensor, and (36) shows an outside air humidity sensor.

Claims (1)

[Claims] Burner (1) under the drying conditions of the outside temperature and the amount of grain added.
In a grain dryer that sets the temperature of hot air generated from
A drying control method characterized by automatically correcting this set hot air temperature based on the outside air humidity under high outside air humidity conditions to perform drying control.