JPS61256178A - Cereal grain drying control system - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a drying control method for drying grains, and can be used in control devices for grain driers, drying plants, and the like.

In conventional grain drying control, the burner combustion was stopped when the grain moisture reached the final target drying moisture.

Problems to be Solved by the Invention In a control mode in which grains are dried while being circulated and transferred to a drying chamber that heats and blows air, and drying is controlled while detecting moisture in the dried grains, The drying condition and the length of drying time are likely to be influenced by the reliability of moisture detection.

Moreover, since the grains are transported in a circular manner, the detected moisture value may vary greatly depending on the drying spots of the sample grains, and the degree of drying decreases as the moisture value approaches the target drying moisture value. Therefore, if heating and blowing with a burner is performed until the final dry moisture value is reached, the fuel consumption rate will only increase and it will be difficult to achieve uniform drying.

Means for Solving the Problems This invention measures the moisture content a certain number of times (b) when the moisture content of circulating grains dried by heating and ventilation from a burner (1) becomes below a certain value (a). Measured value (c)
A structure of a grain drying control system characterized in that when there is a large variation in this measured value (c), the burner (1) is stopped, and when the variation in this measured value (c) becomes small, the burner fil is ignited to restart heating drying. shall be.

Effect of the Invention When the grains in the dryer are heated and dried while being circulated through the drying chamber with heated air blown by the burner (1), the moisture content of the grains decreases and approaches the final target dry moisture value, reaching a constant value (I). )
When the moisture content of the dried grain is below, the moisture content of the dried grains will be measured a certain number of times (b), and if there is a large variation in each measurement value (c), the burner (1) will be stopped and tempering will be performed during this time. As a result, not only the drying within the heated grain itself but also the drying between the grains becomes uniform. Within this predetermined time (d), the moisture measurement for the number of steps (b) is ＼
This will be repeated, and the dispersion of each measured value (c) will be determined in the same way, and as the refining progresses, the dispersion of each measured value (c) will decrease, so at this time the burner (1) will be ignited. The heat drying is then restarted and continues until the final dry moisture value is reached.

Effects of the Invention In this way, when the dry moisture value of the grains reaches a certain value (a) or less at the end of the drying process, while determining the dispersion of the moisture value of the grains, if there is a large variation in the dry moisture value, After stopping the burner (11) and performing tempering drying to reduce the variation in dry moisture of the grains, turn on the burner (11) again.
1), the heating drying time using the burner (1) can be shortened and fuel consumption can be reduced. Moreover, during the stop time of the burner (1), the ) is carried out repeatedly, so reheating is performed by burner (1) as soon as the dispersion of the measured moisture value (c) decreases;
It is possible to minimize the tempering time and achieve uniform drying without having to leave the stop time of 1) for a long time.

Embodiment In the illustrated example, the grain dryer is provided with a grain storage chamber (2) in the upper part, and the grains flowing down from the storage chamber (2) in the middle part are guided downward and heated by hot air. A drying chamber (3) for heating is provided, and the grains fed out from the drying chamber (3) in the lower part by rotation of the feeding valve (4) are collected by a helix (7) and raised on one side. A collection room (6) is provided for transferring to the grain raising machine (5), and the grain raising machine (5) is located in the storage room (2).
The structure is such that it communicates with the top and circulates and transports dried grains.

A burner (1) is installed on the front side of the dryer body, and a drying chamber (3) is installed.
), and a suction/exhaust fan Q41 is provided on the back side to communicate with the other side of the drying chamber (3), and the hot air heated by the burner (1) is passed across the drying chamber (3). It is provided to suck and exhaust air to the exhaust fan (7). Further, a control box (8) is provided above the burner (1).

A computer is installed in the control box (8).

It controls each part, and the input interface of the central processing unit (9) includes an operation switch (1ω), a target dry moisture setting device (Iυ), a temperature sensor α, and a moisture sensor (131
etc., and the output interface is connected to the suction dust extractor 04. The burner (1) and a display circuit that indicates that the tempering action is in progress are connected for output, and among these, the operation switch (1@) sends the grains to the storage chamber (2) by the grain raising machine (5). Tensioning switch for supplying, feeding valve (4
) is rotated to allow the grains in the drying chamber (3) to flow down and circulate the grains to a state where they can be dried; a discharge switch to discharge the grains after drying; and a discharge switch to discharge the grains after drying. A stop switch, etc. that stops the drying operation is connected to the above input interface, and a timer that sets the drying end time, a temperature setting device, etc. that sets the starting temperature at which the grains should be dried in the early stage of drying are also connected. ing.

The moisture setting device (1υ) is used to set the final target dry moisture value (d), and this moisture value (d) is set by the moisture sensor (1υ).
When detected at 31, the dryer is interlocked and configured to be stopped. Moisture sensor (134) detects moisture by sampling the drying grain at appropriate intervals during the drying process, and adjusts the fuel supply by the burner (1) to follow the pre-programmed drying control curve + IQ. , fuel supply time, etc.

In addition to this moisture sensor (+3), there is a flow sensor that detects whether grain is being circulated inside the dryer.

Various sensors are also input to the input interface, such as a full sensor that detects when grains are fully supplied into the storage chamber before drying starts, and a wind pressure sensor that detects the wind pressure exerted on the drying chamber (3) by the exhaust fan 04. has been done.

In addition, the input interface includes a constant moisture setting device (1) connected to input a constant moisture value (A) that causes the moisture sensor (131) to detect the constant moisture value (A), and a moisture sensor (131 that detects this constant moisture value (A)). Therefore, the moisture content is detected while each grain is taken out, and this moisture detection is performed continuously for a certain number of times (b).Also, this moisture detection is performed for a certain period of time. It is also possible to have a configuration in which moisture detection is performed continuously many times within this time period.Moreover, this fixed number of moisture detections (b) may be configured to be repeatedly performed at regular intervals by setting a timer, etc. There is.

When a constant moisture value (A) is detected by the moisture sensor (131), this moisture sensor (131) detects moisture a certain number of times (B), and the moisture value (C) at each detection is determined as the reference moisture value (H). ), and if the number of times the moisture value is outside the range of this standard moisture value (e) is greater than a certain value (f)
The control structure is configured so that the burner fl) is stopped and the exhaust fan (14), the delivery valve (4), etc. are kept interlocked, and the display circuit (19) lights up the indicator lamp etc. to start the refining action f.
Displays that it is in lEI.

The standard moisture value (
If the moisture value is within the range (e) and the number of times the moisture value is outside the range (e) is small, the burner (1) will be configured to continue drying without stopping. When some of the burners (1) are stopped in this way, the timer repeatedly detects moisture in the same way after a certain period of time and compares it with the standard moisture value (E), and detects moisture outside the range of this standard moisture value (E). When the number of times a certain moisture value (c) is less than a certain value (g), this will stop the moisture detection for a certain number of times (b),
In addition, the control is interlocked so as to ignite and burn the burner (1) and restart heating drying ++9).

When the grains are loaded and stored in the storage chamber (2) and the drying chamber (3) and the drying switch is turned on, the grains are flowed down the drying chamber (3) by the rotation of the delivery valve (4) and are raised. Machine (5)
is returned to the storage chamber (2) and circulated. Here, when the exhaust fan (141) is rotated, the drying chamber (3) is ventilated. When the burner (1) is interlocked, ignition combustion is performed, and the hot air is traversed through the drying chamber (3) to remove the grains. Let it heat up.

This drying action (firstly, the amount of heating, heating time, etc., is controlled by the fuel valve of the burner (1), etc.), and the drying is controlled so as to follow a certain drying control curve.

The moisture content of the grain is reduced with drying, resulting in a constant moisture value (a)
When reaching this temperature, if there are large variations due to moisture detection, the burner (1) is stopped, grain circulation transfer and ventilation by the exhaust fan (141) are performed, and the grains are removed in the storage room (2). A so-called tempering effect is performed between the grains to equalize the moisture content between the grains.

In addition, the moisture sensor (131) detects the moisture content of the grain many times (b) during this period, and determines how many times the ratio of the number of measurements of the moisture value (c) other than this reference moisture value (e) occurs. However, when this ratio is greater than a certain level.

After a certain period of time, the same detection measurement is repeated, and during this time, the burner (1) is stopped and the tempering action (1 [l) is performed. is done.

In addition, when detecting moisture using such a moisture sensor (1'5), if the ratio of the number of moisture detections other than the reference moisture value (e) decreases, it means that the drying of the grain has progressed, and the dryness of the grain is Now, the burner (1) is fired to restart heating drying in the drying chamber (3).

In this way, when the moisture content of the grain reaches the target set dry moisture value, the moisture sensor (13) detects this and the burner etc. are stopped and drying is completed.

[Brief explanation of drawings]

The figures show one embodiment of the present invention, with FIG. 1 being a block control circuit diagram and FIG. 2 being a drying control process diagram. FIG. 3 is an enlarged view of a portion thereof, and FIG. 4 is a side sectional view. In the figure, (1) is the burner, (2) is the storage chamber, (3) is the drying chamber, (4) is the delivery valve, (1υ is the drying moisture setting device, (13 is the moisture sensor, (141 is the suction exhaust) Dust machine, (I [
i) is the drying control curve, (1 force is a constant moisture setting device, (a)
is - running water value, (b), is - number of steps, (c) is measured value,
(D) is the target dry moisture value, (E) is the reference moisture value, (F)
indicates when there is a lot of variation, and (G) indicates when there is little variation.

Claims (1)

[Claims] When the moisture content of the circulating grains dried by heating and ventilation from the burner (1) falls below a certain value (a), the moisture content is measured a certain number of times (b), and if there is a large variation in the measured values (c), the The grain drying control method is characterized in that the burner (1) is stopped, and when the variation in the measured value (c) becomes smaller, the burner (1) is ignited to restart heating drying.