JPH0428994A - Drying control system for cereals drier - Google Patents

Abstract

PURPOSE:To eliminate an erroneous operation of a timer, to automatically set the timer and to raise its accuracy by automatically setting a predetermined drying time at the timer each time dryness reduction rate of the cereals reaches a predetermined value. CONSTITUTION:A moisture setting knob 36, a dryness reduction rate setting knob 37, a cereals type setting knob 38 and a charging amount setting knob 39 of an operation unit 15 are respectively operated to predetermined positions, and a start switch 34 is operated to start the sections of a cereals drier 5, hot blast unit 1, a moisture sensor 3, etc., and the temperature of hot blast generated from the burner 6 of the unit 1 is set. When the sensor 3 detects the same cereals moisture as a finishing target moisture or a drying time set to a timer 4 is elapsed, the drier 5 is automatically stopped under an automatic control of a dry controller 46 to stop drying of the cereals. Each time calculated cereal dryness reduction rate calculated by the detected cereals moisture reaches a lower predetermined value than the rate set by the knob 36, the cereals are dried while repeating setting of a predetermined drying time to the timer 4.

Description

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

Conventional technology In the past, grains flowing down a drying chamber were exposed to hot air and dried by the hot air generated from a hot air device passing through the drying chamber and being discharged outside the machine. The grain dryer will automatically stop all operating parts when the sensor detects the same grain moisture as the finishing target moisture, or when the drying time manually set on the timer has elapsed, whichever comes first. This was a drying operation control method that assumed that the drying of the grains had been completed.

Problems to be Solved by the Invention The grains that are repeatedly fed out and flowed down inside the drying chamber of the grain dryer are not as dry as the hot air generated from the hot air device, which passes through the drying chamber and is discharged outside the machine. The grain is dried by being exposed to hot air and the moisture sensor detects the same grain moisture as the finished target moisture, or the drying time manually set on the timer has elapsed, whichever comes first. Each part of the dryer's operation is automatically controlled to stop grain drying.

During this drying process, the timer may be operated incorrectly, and due to this error, the dryer may be stopped even though drying of the grains has not yet been completed. The aim is to automatically set the timer and improve its accuracy.

Means for Solving the Problems The present invention provides a drying chamber 2 in which grains are dried by blowing hot air through a hot air device 1 while flowing down the grains. A grain dryer is provided with a moisture sensor 3 that detects grain moisture during drying, and calculates the drying rate of the grain from the grain moisture detected by the moisture sensor 3. The drying operation control method is characterized in that a predetermined drying time is automatically set in the timer 4 to dry the grains every time the drying loss rate is reached.

Effect of the Invention The grains that are repeatedly fed out and flowed down in the drying chamber 2 of the grain dryer are heated by the hot air generated from the hot air device 1 passing through the drying chamber 2 and being discharged outside the machine. The grains are dried by being exposed to hot air, and the moisture content during this drying is detected by the moisture sensor 3. The drying rate of the grains is calculated from the detected grain moisture, and the calculated drying rate and settings are If the comparison results are found to be different, the temperature of the hot air generated from the hot air device 1 is controlled to increase or decrease so that the calculated drying rate becomes the same as the set drying rate. The drying process is controlled as follows. During this drying operation, for example, if the calculated drying loss rate is 0.
Each time the grain reaches 5%, a drying time of 1 hour is automatically set to the timer 4 to dry the grains, and either the moisture sensor 3 detects the same grain moisture as the finishing target moisture, or the timer 41\ When the set one hour has elapsed, each part of the dryer is automatically stopped and the drying of the grains is stopped.

Effects of the Invention According to the present invention, a predetermined drying time is automatically set to the timer 4 each time the grain drying rate reaches a predetermined drying rate, thereby preventing the drying time from being erroneously set to the timer 4. Each time the specified drying rate is reached,
By setting the drying time to the timer 4, the accuracy of the timer 4 was improved.

Example Hereinafter, five embodiments of the present invention will be described based on the drawings.

The ward system shows a state in which a burner 6 of a hot air device 1 is attached to a circulation type grain dryer 5 for drying grains.

This dryer 5 has a rectangular shape that is long in the front and back direction, and has a transfer gutter 8 and a ceiling plate 9 in which a transfer spiral is rotatably installed in the upper part of the mechanism 7, and grains are stored below the ceiling plate 9. A storage chamber 10 is formed.

On the lower side of this storage chamber 10, exhaust chambers 11.
11 and the ventilation chamber 12 in the center are the left and right drying chambers 2.
At the bottom of these drying chambers 2, 2, a delivery valve 13, 13 for delivering and flowing grains is rotatably supported.

The lower side of the drying chamber 2.2 is configured to communicate with a grain collection gutter 14 in which a transfer spiral is rotatably installed.

On the front side of the mechanism 7, the hot air device 1 is removably attached to the outer surface of the mechanism 7 to correspond to the population side of the ventilation chamber 12, and the hot air device 1 and the dryer 5
An operating device 15 for starting and stopping each operation for loading, drying, and discharging is detachably installed.

On the rear side of the fork shaft 7, there are left and right exhaust chambers ll and 11.
A hanging fJP air passage chamber 16 is formed which communicates with the air exhaust passage chamber I6, and an exhaust fan 18 and an exhaust fan motor 19 for rotationally driving the exhaust fan 18 are provided in the central side exhaust body I7 of the air exhaust passage chamber I6.

Reference numeral 20 designates a structure in which a valve motor rotationally drives the delivery valve 13.13 via a speed reduction mechanism 21.

The hot air device 1 is provided with the burner 6 installed inside a burner case 22, and a fuel pump 23 having a fuel valve is provided on the outer side of the lower plate of the burner case 22, and the fuel pump 23 supplies fuel by opening and closing the fuel valve. The fuel in the tank 24 is sucked in and supplied to the burner 6.

A variable-speed blower motor 26 for rotating the blower 25 at variable speeds is provided on the upper plate, and the structure is such that combustion air commensurate with the supplied fuel is blown to the burner 6 at a rate of $1125.

A supply port for supplying the transferred grains into the storage chamber lo is provided at the center in the front-rear direction of the bottom plate of the transfer gutter 8, and below the supply port, the grains are evenly diffused and returned to the storage chamber 10. A diffuser panel 27 is provided.

The grain elevating machine 28 is provided outside in front of the mechanism 7, has a belt with a packet conveyor 29 stretched inside, and has a dispensing cylinder 30 between its upper end and the starting end of the transfer gutter 8. Connect the bottom end.

A supply gutter 31 is provided between the terminal end of the grain collection gutter 14 and communicated therewith.

Reference numeral 32 denotes a grain hoist motor, which includes a belt with the packet conveyor 29, the transfer spiral in the transfer gutter 8, and the spreader plate 27.
etc., and the transfer spiral in the grain collecting trough 14 is driven to rotate via the belt with the packet conveyor 29.

A moisture sensor 3 for detecting grain moisture is provided approximately at the vertical center of the grain raising machine 28. This moisture sensor 3 operates by transmitting an electrical measurement signal from the operating device 15.
The moisture motor 33 rotates and each part of the moisture sensor 3 is rotationally driven to receive the grains falling while being conveyed to the upper part by the packet conveyor 29, crush the grains under pressure, and at the same time crush the crushed grains. It is configured to detect moisture.

The grain moisture detected by the moisture sensor 3 is input to the operating device 15 to calculate the drying rate of the grain.

The operation bag FT15 has a two-box shape, and on the surface plate of this box there are a start switch 34 for starting and stopping the drying machine 5, the hot tare bag fi1, etc. for each operation of drying and discharging, and a stop switch 34 for stopping the drying machine 5 and the hot tare bag fi1, etc. A switch 35, a moisture setting switch 36 for setting the finishing target moisture content of grains depending on the operating position, and a drying rate setting switch 37 for setting the drying rate of the grains depending on the operating position. A grain type order setting pusher 38 and a loading amount setting pusher 39 set the temperature of the drying air depending on the operating position, a digital display section 4o that alternately digitally displays detected grain moisture, detected drying temperature, remaining drying time, etc. A monitor display, etc. is provided.

Also, inside there is an A-D converter 41 for A-D converting the detected value.
An input circuit 42 to which the converted value converted by this A-D converter 41 is input. Input circuit 43 to which various detected values are input.
A CPU 44 that performs arithmetic and logical operations, comparison operations, etc. on input values input from these input circuits 42 and 43;
It has a built-in drying control device 46 including an output circuit 45 that receives various commands from U44 and outputs them, and a timer 4 for setting a drying time. The settings 36, 37, 38, and 39 are of rotary switch type, and are configured to set predetermined values and types depending on the operating position.

Drying control of grains by the drying control device 46 is as follows (
This is the configuration that is performed. That is, the operation contents of the moisture setting setting 36 are input to the CPU 44, and the finishing target moisture of the grain is set by this input. On the other hand, the grain moisture detected by the moisture sensor 3 is also input to the CPU 44, the input detected grain moisture is compared with the set finishing target moisture, and it is detected that the detected grain moisture has reached the finishing target moisture. Then, each operating part of the dryer 5 is automatically stopped to finish drying the grains.

The drying rate (MW) of this grain is calculated from the detected grain moisture input to the CPU 44, and the calculated grain drying rate (MW) and the operation of the drying rate setting hunting 3G are calculated. The contents are input to the CPU 44, and the grain drying rate (MW 1 ) is determined by this input.

For example, when operating to the 0.8 position, it is set to 0.8%/h, and this set grain drying rate (MWI) is compared,
If they are different, the amount of fuel supplied to the burner 6 and the amount of combustion air are controlled to increase or decrease so that the calculated grain drying percentage (MWI) becomes the same as the set grain drying percentage (MWI). It has a grain drying rate control configuration that controls increase and decrease.

Further, for example, a grain drying rate (M
W2) (7) 0. When a drying rate (MW) equal to S%/h is calculated from the detected grain moisture, every time 0.5%/h of this calculated drying rate (MW) is calculated.

The drying time is set to 1 hour to the timer 4, and the drying time of 1 hour is repeatedly set to the timer 4 every time the calculated drying loss rate (MW) 0.5%/h is calculated. . Each part of the operation of the dryer 5 is automatically stopped when the set one hour has elapsed or when the detected grain moisture reaches the finishing target moisture as described above, whichever comes first.

In addition, the drying control device 46 has the following functions. That is, the grain type setting machine 38 and the grain setting machine 3
9 is input to the CPU 44, and based on this input, the temperature of the hot air generated from the burner 6 is selected and set. On the other hand, the hot air temperature in the blast chamber 12 detected by the hot air temperature sensor 47 is also input to the CPU 44, and the input detected hot air temperature and the set hot air temperature are compared, and if they are different, it is determined that the hot air temperature is the same as the set hot air temperature. so that
The hot air temperature is controlled to increase or decrease the amount of fuel supplied to the burner 6 and the amount of combustion air.

Furthermore, when the grain drying rate control is started, the grain drying rate control is given priority over the hot air temperature control.

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

Start switch 3 to start dehumidifying and drying by operating each setting knob 36, 37, 38° 39 of the operating device W115 to a predetermined position.
By operating 4, each part of the grain dryer 5, the hot air device 1, the moisture sensor 3, etc. are started, and the temperature of the hot air generated by the burner 6 of the hot air device 1 is also selected and set.

This set hot air is generated from the burner 6, and this hot air passes from the ventilation chamber 12 to the drying chamber 2.2, and then passes through the ventilation chamber 11.2.
The grains taken into the storage chamber IO by being suctioned and exhausted by the exhaust fan 18 through the storage chamber 11 and the exhaust duct chamber 16 are flowing down from the storage chamber IO in the drying chamber 2.2. The grains are exposed to this hot air and dried, and are fed out to the lower part by the feed valve 13.13, flowed down, and transferred and supplied from the grain collection gutter 14 through the feed gutter 31 into the grain hoisting machine 28 by the lower transfer spiral, The packet is conveyed to the upper part by the conveyor 29 and supplied into the transfer gutter 8 through the dispensing cylinder 30, and from this transfer gutter 8, it is transferred and supplied onto the diffusion plate 27 by the upper transfer spiral, and by this diffusion plate 27, it is supplied to the storage chamber. Either the moisture sensor 3 detects the same grain moisture as the finishing target moisture set by operating the moisture setting switch 36 after being uniformly diffused and reduced into the IO, and is circulated and dried, or the timer 4
When the set drying time has elapsed, the drying control device 46 of the operating device 15 automatically stops the drying 115, thereby stopping the drying of the grains.

During this drying work, a predetermined drying rate (MW l ) lower than the grain drying rate (MW l ) set by operating the drying rate setting knob 36 is performed.
Each time the calculated grain drying rate (MW) calculated from the detected grain moisture reaches MW2).

The setting of a predetermined drying time on the timer 4 is repeated until the grains are dried.

[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 grain dryer, and Fig. 4 is A--A in Fig. 3. A sectional view, FIG. 5 is a rear view of a part of the grain dryer, and FIG. 6 is an enlarged front view, partially cut away, of a part of the grain dryer. Explanation of symbols 1 Hot air equipment ffi 2 Drying room moisture sensor 4 Timer

Claims (1)

[Claims] A drying chamber 2 is provided in which the grains are dried by blowing hot air through the hot air device 1 while the grains are flowing down, and a moisture sensor 3 is provided to detect the moisture content of the grains during drying. The grain dryer for calculating the drying rate of grains is characterized in that each time the drying rate of the grains reaches a predetermined drying rate, a predetermined drying time is automatically set to a timer 4 to dry the grains. Drying operation control method.