JPH0639990B2 - Grain dryer controller - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a grain dryer control device, and particularly to a grain moisture control device for measuring a moisture content of a grain even when a sampling error occurs in the grain moisture measurement device. The present invention relates to a control device for a grain dryer that continues a drying operation.

[Conventional technology]

Traditionally, grain dryers have been equipped with a grain moisture content measuring device that measures the moisture content of the grain in order to determine the degree of drying, and based on the signal from this grain moisture content measuring device, the moisture content of the grain is measured. Is controlled to the target moisture value.

This grain water content measuring device is provided with a pair of rotating electrode rolls. Grain is fed between the electrode rolls and crushed. After that, a constant voltage is applied to the pair of electrode rolls, the voltage changed by the electric resistance of the crushed grain is measured, and the moisture value of the grain is measured. That is, since the electric resistance of the grain becomes small when the water content of the grain is small, the water content of the grain is measured by measuring the voltage that changes according to the change of the electric resistance. When the measured moisture content of the grain reaches the target moisture content set in the grain dryer, the drying of the grain is finished.

On the other hand, in the grain moisture content measuring device, grain may not be supplied between the electrode rolls due to the influence of straw or rice husk, or the moisture content of the grain may not be measured due to a small supply amount. In the case of such a sampling error, "L" is displayed on the display for displaying the moisture value. This means that the moisture value of the grain could not be measured, so the moisture value below the specified value (13%) was measured, and for fuel supply to the burner that generates hot air to prevent overdrying of the grain. Stop the pump to extinguish the burner and stop the grain drying operation.

[Problems to be solved by the invention]

However, if the grain drying operation is stopped when the moisture value of the grain cannot be accurately measured, the interruption time is wasted when the drying operation is performed unattended. In addition, there is a problem in that the grain is steamed in the dryer due to the interruption of the drying operation, which may lead to deterioration in quality.

The present invention has been made to solve the above problems, and a grain dryer for continuing the grain drying operation even when the grain moisture content measurement device cannot accurately measure the moisture value of the grain being dried. An object is to provide a control device.

[Means for solving problems]

In order to achieve the above object, the present invention compares a moisture value of a grain measured by a grain moisture content measuring device with a target moisture value, and when the moisture value of the grain reaches a target moisture value, a grain dryer. Is a controller for a grain dryer that stops the operation of, and sampling for determining that a sampling error has occurred when the moisture value measured by the grain moisture content measuring device is equal to or lower than a reference value lower than the target moisture value. If it is determined by the error determination means and the sampling error determination means that a sampling error has occurred, the drying operation is continued based on the remaining drying time calculated based on the previously measured water content value and the target water content value. And a control means for controlling.

Further, it is preferable that the control unit alternately displays the water content value measured last time and the elapsed time when the sampling error determination unit determines that the sampling error has occurred.

[Action]

In the present invention, it is determined that a sampling error has occurred when the moisture value measured by the grain moisture content measuring device is equal to or less than the reference value lower than the target moisture value. If it is determined that a sampling error has occurred, the remaining drying time is calculated from the moisture value and the target moisture value measured with the previous grain moisture content measuring device,
The drying operation is continued based on the remaining drying time. As a result, the grain drying can be terminated at the moisture value near the target moisture value, and the grain can be continuously dried without being overdried. Further, it is possible to prevent the quality of grains from being deteriorated due to interruption of the drying operation due to a sampling error.

〔Example〕

An embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 1 shows a schematic configuration diagram of the control device of the grain dryer.

The grain water content measuring device 10 is arranged in the vicinity of the grain conveyor bucket conveyor 12 of the grain dryer. The grain moisture measuring device 10 is provided with a pair of electrode rolls 16. The electrode roll 16 is made of a conductive metal material, and is formed of a substantially disc-shaped detecting portion 18 and a shaft portion 20 protruding from the center of the detecting portion 18 toward one side in the axial direction. As shown in FIG. 2, the peripheral wall 90 of the detecting portion 18 is knurled, and the spiral groove 9 is further formed.
2 and about 1/4 of the circumference, a notch 94 is formed in a circular arc shape. The electrode roll 16 is inserted and supported by the case 22 so as to rotate around the shaft portion 20. The case 22 is an insulating member having a pair of through holes 24 for supporting the electrode roll 16 formed in the center thereof.
4, the shaft portion 20 of the electrode roll 16 is inserted into the shaft portion 20.
On the other hand, each of them is pivotally supported via two ball bearings 26 at the front and rear.

Each ball bearing 26 for supporting the shaft of the electrode roll 16
The conductive contact terminals 28 are arranged so as to be sandwiched between them, and the contact terminals 28 come into contact with the shaft portion 20 of the electrode roll 16.

Further, the gears 14 are coupled to the tip of the shaft portion 20 of the electrode roll 16 which is rotatably supported by the case 22 by the ball bearings 26 in a state where they mesh with each other. Therefore, as the gear 14 rotates, the electrode rolls 16 rotate so as to face each other.

The coupling portion between the gear 14 and the shaft portion 20 is made of an insulator. Therefore, the electrode roll 16 and the gear 14 are non-conductive even after they are combined and integrated.

A gear (not shown) meshes with the gear 14, and the gear is pivotally supported by an output shaft of a drive motor (not shown). Therefore, the driving force of the driving motor is the gear 14
Is transmitted to the electrode roll 16 integrally with the gear 14.
Are opposed to each other and are rotated. Therefore, when grain is supplied between the electrode rolls 16, the electrode rolls 1
The grain is crushed by 6.

The contact terminal 28 arranged so as to come into contact with the shaft portion 20 of the electrode roll 16 is connected to the control circuit 32.

The control circuit 32 includes a central processing unit (CPU) 34, a read only memory (ROM) 36, a random access memory (RAM) 38, an input port 40, an output port 42, and a data bus and a control bus connecting these. And the like 44 are included. A timer 35 for setting the remaining dry time is connected to the CPU 34. The input port 40 has an analog-digital (A /
D) The contact terminal 28 is connected via the converter 46, and the moisture setting dial 50 for setting the target moisture value of grain is connected. Further, to the output port 42, a display 54 including a light emitting diode (LED) for displaying a grain moisture value or a grain moisture sampling error is connected via a drive circuit 52, and also via a drive circuit 56. An electromagnetic pump 58 for supplying fuel to a burner that generates hot air is connected. Also, output port 4
A motor of a grain conveyor 62 and the like are connected to 2 via a drive circuit 60.

The operation of the present embodiment configured as described above will be described. FIG. 3 shows the control routine of this embodiment. When the grain drying operation is started, the set moisture value S ₀ set in the moisture setting dial in step 100 is read and stored in the RAM 38. At the next step 102, it is judged whether or not the sampling period T for measuring the grain has been reached, and when the sampling period T has been reached, step 1
In 04, the electrode roll 16 of the grain moisture content measuring device 10
Is rotated and the grain supplied between the electrode rolls 16 is crushed, and the moisture content of the grain is measured. In step 106, this measured measured water content S ₁ is read. In the next step 108, it is judged whether or not there is a sampling error. That is, it is determined whether or not sampling error has occurred by determining whether or not the measured moisture value S ₁ read in step 106 is equal to or less than a predetermined moisture value (13%), that is, a value lower than the set moisture value.

If it is determined that the sampling error has not occurred, the remaining drying time of the timer 35 set in the case of the sampling error is reset in step 110, the count value n for counting the number of sampling errors is reset, and the drying operation is performed in step 112. The remaining drying time T ₀ until the end is calculated. That is, the measured moisture value is S ₁ ,
When the set water content value is S ₀ and the drying loss rate according to the type of grain is A (for example, 0.8 (% / hr)), the remaining drying time T ₀ is represented by the equation (1).

Drying remaining time _{T 0 = (S 1 -S 0} ) / A ·· (1) Drying remaining time _{T 0} is the sought equation (1) RAM38
Memorized in. In the next step 114, the drying operation is performed by the normal moisture measurement control, and the step 116 is performed.
At, the measured moisture value S ₁ is stored in the RAM 38 and displayed on the display 54. And step 118
Measured moisture content of the S ₁ and set moisture value S ₀ is compared, and turns off the electromagnetic pump 58 for supplying fuel to the burner for generating hot air in the measuring water content values S ₁ is set moisture value S ₀ becomes less, the step 120 in Then, the motor of the grain conveyor 62 is turned off, and the drying operation is completed. If the measured moisture value S ₁ is larger than the set moisture value S ₀ , step 102
And the grain moisture value is measured again.

If it is determined that there is a sampling error in step 108, the remaining drying time T is determined in step 122.
₀ is read from the RAM 38, the count value n indicating the number of sampling mistakes is counted in step 124, and the elapsed time T ₂ from the sampling mistake in step 126 is calculated from the count value n and the cycle T. In the next step 128, the drying time T ₁ until the end of the current drying is calculated. That is, the remaining dry time T ₁ is obtained by subtracting the elapsed time T ₂ from the remaining dry time T _0, and is represented by the equation (2).

Drying remaining time _{T 1 = T 0 -T 2 ··} (2) drying the remaining time _{T 1} to the switching instead timer 35 to the timer control based on the dry remaining time _{T 1} from moisture measurement control in the next step 130 is set Drying work is performed. At the next step 132, the previously measured water content S ₁ and the elapsed time T ₂ are alternately displayed on the display 54, and at step 13
At 4, it is determined whether the timer 35 has timed up after the remaining drying time T ₁ has elapsed. When the timer 35 has timed up, the drying operation is completed at step 120. When the remaining drying time T ₁ has not elapsed, the process proceeds to step 102 and the grain moisture value is measured again.

The control routine of FIG. 3 described above is shown in Tables 1 and 2.
A detailed description will be given based on specific examples shown in the table.

A moisture content setting value is set to 15% on the moisture content setting dial 50, and as shown in Table 1, the first moisture content measurement time is performed 1 hour after the start of drying, and the measured moisture content value is measured at 20%. At this time, the control routine calculates the remaining drying time T ₀ for the first time from the equation (1),
It will be 6.3 hours (however, A = 0.8). That is, it becomes like the formula (3).

T ₀ = (20% -15%) / (0.8% / hr) = 6.3hr ··· (3) Next, the second measurement is performed 2 hours after the start of drying, and a sampling error occurs at that time. Then, the remaining drying time T ₁ for the second time is calculated from the _first remaining drying time 6.3 hours by the formula (2) to be 5.3 hours. That is,
It becomes like the formula (4).

_{T 3 = 6.3hr-1hr = 5.3hr} ·· (4) Accordingly, the timer 3 as drying stops after 5.3 hours
The remaining dry time is set to 5. Here, as shown in FIG. 4, the water content of the grain was 20% one hour ago,
Display 5 to indicate that sampling has been missed
4% and 20% and 1 hr are displayed alternately.

Further, as shown in Table 1, if a sampling error occurs even after the second measurement after each cycle T, the drying is finished 5.3 hours after the second measurement. Also 3, 4,
If a sampling error occurs during the 5th or 6th measurement,
The water content of the grain was 20% two, three, four, and five hours ago, but 20% and 2hr, 20% and 3hr, 20% and 4hr were displayed on the display 54 to indicate that sampling was missed. ,
20% and 5hr are displayed alternately when sampling error occurs.

In addition, as shown in Table 2, the third grain moisture value is 1
When it is measured to be 8% and 4%, the set time (5.3 hours) of the timer 35 is cleared and the normal moisture measurement control is performed, and only the measured moisture value of 18.4% is displayed on the display 54. It When the grain moisture value of the fourth time is measured as 17.4%, the measured moisture value of 17.4% is displayed on the display 54.

When the grain moisture value sampling error occurs again at the fifth time, the remaining drying time T at the fourth time is the same as described above.
₂ is calculated from the equation (1) and becomes 3 hours. That is,
(5) The thus become _{T 2 = (17.4-15) /0.8=3hr ··} (5) Then, dry the remaining time _{T 1} is the fifth from the dry residue time 3hr at 4 th (2 It is calculated by the equation) and becomes 2 hours. That is, it becomes like the formula (6).

_{T 3 = 3-1 = 2hr ·· (} 6) Thus, dry after 2 hours is set drying remaining time in the timer 35 to stop. Here, as mentioned above,
7.4% and 1 hr are displayed alternately on the display 54.

If a sampling error occurs at the 6th time, 2
The water content of the grain was 17.4% before the hour, but the sampling error was 17.4% on the display 54 for 2 hours.
And are alternately displayed, and the drying is stopped after 1 hour.

On the other hand, when the moisture sampling error of the grain does not occur after the third time, the drying remaining time calculated and set in the second time is cleared and the grain drying operation is performed by the normal moisture measurement control.

As described above, when the grain moisture value sampling error occurs in the grain moisture content measuring device, the normal moisture measurement control is automatically switched to the timer control without stopping the grain dryer, and the grain If you can measure the water content,
Since it automatically switches from timer control to moisture measurement control,
It is possible to prevent waste of downtime and deterioration of grain quality. In addition, if a sampling error occurs, the alarm will not be issued by the alarm, but the previous moisture value and the elapsed time from the previous measured value will be displayed alternately on the display, so that the current moisture value can be roughly understood. At the same time, it is possible to determine the convenience (setup) of another work.

Incidentally, it is possible to stop the grain dryer safe side by a fewer dry residual time T ₃ to set the timer 35. When a sampling error occurs, the remaining drying time may be displayed on the display or an alarm may be issued.

〔The invention's effect〕

As described above, according to the present invention, when it is determined by the sampling error determination means that a sampling error has occurred, it is possible to continue drying the grain without overdrying it, thus eliminating the interruption time. It is possible to prevent deterioration of grain quality as well as
The effect is obtained.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing a configuration of a control device for a grain dryer according to an embodiment of the present invention, FIG. 2 is a perspective view showing an electrode roll of a grain moisture content measuring device, and FIG. 3 is a control routine. The flow chart shown in FIG. 4 is an explanatory view showing a display at the time of sampling error of grain moisture. 10 ... Grain water content measuring device, 32 ... Control circuit, 54 ... Display device.

Claims (2)

[Claims] 1. A grain moisture value measured by a grain moisture content measuring device is compared with a target moisture value, and when the moisture value of the grain reaches the target moisture value, the grain dryer is stopped. A controller for the dryer, a sampling error determining means for determining that a sampling error has occurred when the moisture value measured by the grain moisture content measuring device is equal to or lower than a reference value lower than the target moisture value, and When it is determined by the sampling error determination means that a sampling error has occurred, a control means for continuing the drying operation based on the remaining drying time calculated based on the previously measured water content value and the target water content value, A control device for a grain dryer, which has: 2. The control means displays the water content value measured last time and the elapsed time alternately when the sampling error judging means judges that a sampling error has occurred. A controller for a grain dryer according to item (1).