JPH03247985A - Drying control system for grain dryer - Google Patents

Abstract

PURPOSE:To prevent the varieties of drying of grains by a method wherein drying is controlled by a sensor, detecting the moisture of the grains after a predetermined period of time has ellapsed from the starting of the drying, so that a time until the detection of next time is finished is specified as a continuous circulation drying time, upon the continuous circulation of a grain dryer, drying the grains by switching from the continuous circulation into intermittent circulation. CONSTITUTION:Grains are circulated continuously from a reserving chamber 1 into a drying chamber 2 and are dried by the passage of dehumidifying air through the drying chamber 2 while continuous circulation drying is effected after a given period of time is ellapsed until a moisture sensor 5 is started and the detection of the moisture of the grains at next time is finished. When the detection of the moisture is finished, intermittent circulation drying is started and the grains are circulated simultaneously with the starting of the moisture sensor 5 while the circulation is stopped when a given period of time has ellapsed. A timing, in which the continuous circulation drying is switched into the intermittent circulation drying, is controlled so as to be constant at all times in such a manner whereby varieties will never be generated in the dehumidifying amount or drying of the grains and the drying of the grains, stabilized at all times, can be effected.

Description

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

Conventional technology Conventionally, the rotation of a valve that feeds from an upper storage chamber to a lower drying chamber is switched from continuous rotation to intermittent rotation, and the grain is switched from continuous circulation to intermittent circulation.

Dehumidifying air with a predetermined temperature and humidity is generated from the dehumidifying device, and this dehumidifying air passes through the drying chamber.
The grains flowing down in this drying chamber in continuous circulation or intermittent circulation are exposed to this dehumidified air and dried, but this continuous circulation is switched to intermittent circulation after a set period of time has passed, and the next The grain circulation method was a drying control method in which the feed valve was rotated when grain moisture was detected, and the grains were dried under circulation control.

Problems to be Solved by the Invention While the grains are continuously circulated from the storage chamber to the drying chamber by continuous rotation of the delivery valve, dehumidified air is generated from the dehumidifier at the set temperature and humidity, and this dehumidified air is As the grains pass through the drying chamber, they are exposed to the dehumidified air and dried, and after a certain period of time has elapsed, the rotation of the delivery valve is controlled to stop the grains. At the same time as the continuous circulation drying of the grains is stopped and grain moisture detection is started, the intermittent circulation drying of the grains is started, and the rotation of the feeding valve is controlled for a certain period of time to circulate the grains. When the circulation drying time has elapsed, the rotation of the feed valve is controlled to stop the circulation of the grains, and while this intermittent circulation is repeated, the grains flowing intermittently in the drying chamber are exposed to this dehumidified air. and dried.

This dehumidifying drying operation is switched from continuous circulation drying to intermittent circulation drying, and the first grain circulation in this intermittent circulation drying is when grain moisture is detected, so the stoppage time during this period is not a fixed time but is longer. As a result, the moisture in the grains may be removed more quickly and the dryness of the grains may be uneven, and this is an attempt to solve these problems.

Means for Solving the Problems The present invention provides continuous circulation in which grains are fed out and flowed down from an upper storage chamber (1) to a lower drying chamber (2) by continuous rotation of a feed valve (3). ) In a grain dryer that is switched to intermittent circulation in which the grains are fed out and allowed to flow down through intermittent rotation, and the dehumidified air from the dehumidifier (4) is ventilated into the drying chamber f2+ for drying, the drying time is controlled by continuous circulation of the grains. A drying control method characterized in that a moisture sensor (5) that detects grain moisture after a predetermined time has elapsed from the start of drying controls the time until the end of the next grain moisture detection to dry by controlling it to a continuous circulation drying time. The structure is as follows.

Effect of the Invention Grain is fed from the storage chamber (1) to the drying chamber (2) through the delivery valve (3).
), the dehumidifier (
Dehumidified air with the set temperature and humidity set from 4) is generated, and as this dehumidified air passes through the drying chamber (2), the grains that are continuously flowing inside the drying chamber (2) are The grains are dried by being exposed to dehumidified air, and this continuous circulation drying is continued after a certain period of time has elapsed until the moisture sensor (5) is started and the next grain moisture detection is completed. When the grain moisture detection is completed, the rotation of the feeding valve (3) is controlled to stop, the continuous circulation drying of the grains is stopped, the intermittent circulation drying of the grains is started, and the moisture sensor (5) is started at the same time. The rotation of the feed valve (3) is controlled for a certain period of time to circulate the grains, and when this certain period of circulation has elapsed,
The rotation of the feed valve (3) is controlled to stop the circulation of the grains, and while this intermittent circulation is repeated, the grains flowing intermittently in the drying chamber (2) are exposed to this dehumidified air. and dried.

Effects of the Invention According to the present invention, control for switching from continuous circulation drying to intermittent circulation drying of grains is performed after continuous circulation drying has elapsed for a certain period of time and when the moisture sensor (5) is started and grain moisture detection is completed. As a result, the grain moisture detection by the moisture sensor (5) is synchronized, and the cutting time from continuous circulation drying to intermittent circulation drying is always controlled to a constant time, and therefore the amount of water removed from the kernels is controlled. It is possible to always obtain stable drying of the grains without causing variations in the drying of the grains or variations in the drying of the grains.

Example In addition, when the grain dryer (6) is rotated, the container wall (7) of the grain dryer (6) has a rectangular shape that is long in the front and back direction and is made up of front and rear wall plates and left and right wall plates, and the upper end of this container wall (7) has a A transfer gutter (8) rotatably equipped with a transfer spiral and a ceiling plate (9) are provided, and a storage chamber (1) for storing grains is formed below the ceiling plate (9). 1) At the bottom, there are ventilation chambers on both the left and right sides (1
There are drying chambers (2) between each drying chamber (2) and the central ventilation chamber (1).
) is formed and communicated with this storage chamber (11), and at the bottom of this drying chamber (2) there is rotatably supported a feeding valve (3) that feeds out and flows down the grains, and each of these drying chambers (2
) A grain collection gutter aV rotatably equipped with a transfer spiral is provided on the lower side for communication.

The front container wall (7) is equipped with a dehumidifier (4) and an operating device (1 m long) for starting and stopping the dehumidifying device (4) and the dryer (6) for each drying and discharging operation. The dehumidifier (4) and the ventilation chamber (11) are configured to communicate with each other, and an exhaust duct chamber (14) is provided on the rear side of the rear wall (7).
1, and on the rear side of this exhaust duct chamber 04 there is an exhaust fan (19) and an exhaust fan motor (+
61 is provided, and this exhaust fan (l!1) and each of the exhaust chambers (lω) are configured to communicate through the exhaust channel chamber Q41, and the lower part of the rear vessel wall (7) is equipped with a This configuration includes a valve motor (ITl) that rotationally drives the delivery valve (3) via a speed reduction mechanism (m).

A supply port for supplying the transferred grains to the storage chamber (1) is provided in the central part of the transfer gutter (front and rear direction of the river bottom plate), and a supply port is provided below the supply port for distributing the grains evenly into the storage chamber (1). A diffusion plate (composed of a rotatable fence) that diffuses and reduces particles.

The grain raising machine (to) is installed in the front part of the front container wall (7), and inside thereof, a packet conveyor (211 belt) is stretched between the upper and lower pulleys, and the upper end is connected to the starting end of the transfer gutter (8). A discharge tube is provided between them for communication, and a supply gutter is provided between the lower end and the beating end of the grain collection gutter for communication.

Is there a grain raising motor at the top of this grain raising machine? 4 is provided, and this grain hoist motor Q4 moves the packet conveyor G! +1 belt, the transfer spiral in the transfer trough (8) and the spreader plate+
19, etc., and at the same time, the transfer spiral in the grain collection gutter (12+) is rotationally driven via the packet conveyor 1211 belt.

In addition, a moisture sensor (5) for detecting grain moisture is installed in the center of the vertical direction of this grain hoisting machine (5).
) controls the moisture motor Q built into this moisture sensor (5) by transmitting an electrical measurement signal from the operating device (131).
9 rotates to rotationally drive each part of this moisture sensor (5), and this moisture sensor (5) receives grains that fall while being conveyed to the upper part of the packet conveyor +211,
The structure is such that the grains are crushed under pressure and at the same time the water content of the crushed grains is detected.

The dehumidifying device (4) is box-shaped, and the front wall plate of the box has an outside air intake port for sucking outside air! 2B, and the rear wall plate is provided with an air outlet (5) for blowing the outside air sucked into the dehumidifying device (4) into dehumidified air into the air blowing chamber f+11. It is.

In order to convert the outside air sucked into the dehumidifier (4) from the outside air intake port (c) into dehumidified air, the low-temperature, low-pressure gas that is the refrigerant is passed through the compressor c! The gas is adiabatically compressed into a high-temperature, high-pressure gas at 1, and as it passes through the condenser Q9, it loses heat and changes into a high-temperature, high-pressure liquid.Then, the pressure is reduced to a low-temperature, low-pressure liquid at an expansion valve O1, and then the gas is passed through the evaporator OD. As it passes through, it absorbs heat and changes into low-temperature, low-pressure gas.

This cycle is sequentially repeated for the refrigerant, thereby dehumidifying the outside air passing through the dehumidifier (4) and converting it into dehumidified air.

Note that the outside air sucked into the dehumidifying bag W(4) is as follows.

As it passes through the evaporator OD section, it is cooled and moisture in the air condenses, resulting in low-temperature, low-humidity air with reduced absolute humidity.Then, as it passes through the condenser QIJ section, it absorbs heat and becomes slightly lower than room temperature. This configuration provides high temperature, low dehumidification air.

The compressor (C) is rotatably driven by a compressor motor (3), and a heater (2) for auxiliary heating is provided in front of the air outlet (5).

The operating device +131 has a box shape, and the dryer (6) and the dehumidifier (4) are installed on the surface plate of the box.
Start switch (start switch for each drying and discharge operation)
to), a stop switch 09 for stopping operation, a moisture setting wax (2) for setting the finishing target moisture content of grains according to the operation position,
The dehumidifying device f (a grain type setting machine that sets the temperature and humidity of the dehumidifying air generated from the dehumidifying air 41 according to the operating position)
It is equipped with a display window (to) and a monitor display that alternately display information such as , waxing level setting, detected grain moisture, detected drying temperature, remaining drying time, etc. Inside, each detected value is displayed. A-
Between the A-D converters that perform D conversion, each input circuit into which the conversion value converted by this A-D converter (a) and each input value are input, each input circuit @11. CP that performs arithmetic and logical operations, comparison operations, etc. on various input values input from @3
tH43, a drying control device (to) consisting of an output circuit that receives various commands from this CPUH3 and outputs them, etc.
It has a configuration in which each setting wax GQ, (371, (
(to) is a rotary switch type, and has a configuration in which predetermined values, types, etc. are set depending on the operating position.

The drying control bag! The drying control by G4'j is performed as follows, and the operation of the moisture setting knob Oe is controlled by the C
When the input is input to PU@3, the finishing target moisture content of the grain is set by this input, and the moisture sensor (5) detects the moisture content of the grain a predetermined number of times at an interval of, for example, t2, and the CPU
The average moisture value is calculated by inputting it to G43, and the detected average grain moisture is compared with the finishing target moisture. If it is detected that they are the same, the drying control device) automatically controls the drying machine ( 6) is configured to automatically stop drying of the grains.

Switching control from continuous circulation drying to intermittent circulation drying of grains is as follows:
The drying control device is configured as follows. When the operation of the start switch (to) to start dehumidifying drying is input to the CPU f43, the valve motor (+[3) is activated after 7 hours. Started and continuously controlled,
At the same time as the continuous circulation drying in which the feed valve (3) is driven to rotate continuously and the grains are continuously fed out and flowed down is started, the operation of the start switch (B) is input to the CPU (G). , grain moisture detection starts at time t3,
Thereafter, the moisture motor 4 is started at intervals of t2 hours, the moisture sensor (5) is rotationally driven to detect grain moisture, and the valve motor (older) is rotated for t hours to perform continuous circulation drying. After time t has elapsed, the moisture sensor (5) starts to detect grain moisture a predetermined number of times. After finishing, the rotation of the valve motor 11!3 is controlled to stop, the continuous rotation of the feed valve (3) is controlled to stop, the continuous circulation drying of the grains is stopped, and the structure is switched to intermittent circulation drying. The grain circulation is synchronized with grain moisture detection.Also, the grain circulation starting interval during this intermittent circulation drying is started by multiple grain moisture detections.
This configuration is synchronized with grain moisture detection. In addition to the above, there are various motors (tlEi) that rotate and drive the parts necessary for grain drying.
, 124) and (support) are also configured to be started and controlled at the same time as the valve motor (+[1).

The temperature and humidity of the dehumidified air generated from the dehumidifying device (4) are detected by a temperature sensor and a humidity sensor, and the set temperature and humidity of the dehumidified air are set by operating each of the settings. The humidity, the detected temperature, and the detected humidity are compared, and if they are different, the rotation of the compressor motor (3) is controlled to control the compressor (c) so that the humidity becomes the same as the set temperature and set humidity. In this configuration, the heater 03 is controlled.

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

If you operate the operating device (1 turbidity setting wax 00, Each part of the dryer (6) and the dehumidifying bag!! (4) start, and after the predetermined time t3 elapses, the moisture sensor 1
5) is started, and thereafter the moisture sensor (5) is started at a predetermined time interval of t2, dehumidifying air is generated from this dehumidifying device (4), and this dehumidifying air is sent from the air outlet (5) to the air blowing chamber. (l
Air is blown into υ, and from this ventilation chamber (11) the drying chamber (2)
The grains stored in the storage room +11 are transported from this storage room +11 to the drying room by passing through the ventilation chamber [lω] and the ventilation path room 04 and being suctioned and exhausted by the ventilation fan (19). (2
) is exposed to this dehumidified air during continuous flow by the continuous rotation drive of the feeding valve (3), and is dried, and is continuously fed to the lower part by the feeding valve (3) and flows down to the collecting trough (1 system). The grains are fed from inside via the grain raising machine a!G by the transport spiral at the bottom, transported to the upper part by the packet conveyor c! is transferred and supplied from this transfer gutter (8) onto the diffusion plate 191 by the upper transfer spiral, and this diffusion plate! +91, the grains are evenly diffused and returned into the storage chamber (1), and are continuously circulated and dried for a predetermined time t, after which the moisture sensor (5) starts to detect grain moisture. When this grain moisture detection is completed, the continuous rotation of the feed valve (3) is controlled by the drying control device 6.
9, the continuous circulation drying is switched to intermittent circulation drying, and the moisture sensor (5) is started at a predetermined time interval of t2 to complete the predetermined number of grain moisture detections, and the moisture sensor (5) is restarted. At the same time as the sensor (5) starts, the feed valve (
3) is rotated to restart the circulation of the grains, and the same circulation of the grains as in the above-mentioned continuous circulation drying is performed, and during this intermittent circulation drying, the moisture sensor (5) detects the moisture setting. When grain moisture equal to the finished grain moisture set by operating the OQ is detected, the drying control device (4) of the operating device (13) automatically controls the drying machine (6) to automatically stop the grain moisture. Drying of the grains is stopped.

[Brief explanation of drawings]

The figures show one embodiment of the invention, with FIG. 1 being a block diagram and FIG. 2 being a timing chart. Figure 3 is a flowchart diagram, Figure 4 is an overall side view of the grain dryer, Figure 5 is a sectional view taken along line AA in Figure 4, Figure 6 is a rear view of a portion of the grain dryer, and Figure 6 is a partial rear view of the grain dryer. FIG. 7 is an enlarged front view of a portion of the grain dryer, partially cut away. In the figure, (1) is a storage chamber, (2) is a drying chamber, (3) is a delivery valve, (4) is a dehumidifier, and (5) is a moisture sensor.

Claims (1)

[Claims] From continuous circulation in which the grains are fed out from the upper storage chamber (1) to the lower drying chamber (2) by continuous rotation of the feed-out valve (3) to intermittent circulation in which the grains are fed out and flowed down by the intermittent rotation of the feed-out valve (3). In a grain dryer that switches to pass dehumidified air from a dehumidifying device (4) to the drying chamber (2) for drying,
Drying time is controlled by continuous circulation of grains using a moisture sensor (5) that detects grain moisture after a predetermined time has elapsed from the start of drying.
A drying control method characterized in that drying is performed by controlling the time until the end of the next grain moisture detection to a continuous circulation drying time.