JPS6044588B2 - Grain dryer drying automatic stop device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in an automatic drying stop device for a grain dryer, and includes a continuous moisture measuring device installed in a grain tank of a grain dryer and a control unit installed in an operation box installed in a drying section body. A timer connected to the circuit is linked via a calculation mechanism with an AD converter and a memory section, and digital setting of the measured grain moisture value at the start of the drying operation of the grain bin is achieved by the operation of a simple button switch. In addition, the grain circulation process can be maintained by always achieving a predetermined drying time or moisture content without being affected by malfunctions of the moisture measuring device or fluctuations in measured values due to drying spots during grain drying. We aim to develop and provide a new device that has the advantage of stopping the electric motor to completely prevent the generation of harmful grains such as split grains and over-dried grains, and constantly ensuring dry grains of high quality and a specified moisture content. It is.

To explain the present invention with reference to the drawings, reference numeral 1 in the drawings indicates a machine body with a ventilation drying section in which a hot air chamber 2, grain flow channels 3, 3, and ventilation chambers 4, 4 are arranged side by side. This is a circulating grain dryer that is integrally formed with a grain tank 5 mounted on the top and an elevator 6 erected on one side. Next, regarding the grain circulation process A of the dryer, the grain distribution plate 7 is rotatably suspended in the center of the upper wall of the grain tank 5 provided at the top, and the distribution plate 7 is provided on one side of the machine. The upper discharge port of the elevator 6 is connected to the conveyor 8, and the lower part of the grain tank 5 communicates with grain flow channels 3, 3 formed with porous walls on both sides.
The hot air for drying in the hot air chamber 2 is formed so that it passes laterally through the grain layer formed in the flow path and flows out into the exhaust chambers 4, 4 to perform a drying action.

Next, the dried grains are intermittently poured into the grain tank 1 by rotating the discharge valves 9, 9 provided at the lower end of the flow path 3. is discharged into
The grain flows out to the feeding port 12 of the elevator 6 by the conveyor 11 provided at the bottom of the tank 10, and the rotation of the conveyor 11 drives the elevator 6 and the conveyor 8, and the grain is fried again into the upper grain tank 5. It is configured to carry out cyclic tempering drying. Each of the rotating parts of the shell circulation process A is connected to an electric motor 14 by a suitable rotation transmission means 13 such as a pulley, a belt, a gear, a crank mechanism, etc., and is configured to rotate as appropriate.

Further, 15 is an exhaust fan, and 16 is a supply hopper at the bottom of the elevator. Next, regarding the drive electric circuit 17 for the shell circulation process A in FIG. , and the electromagnetic coil MC of the electromagnetic contactor between terminals R and S.
The normally closed contact R1 of the electromagnetic coil R1 and the normally closed contact R2 of the electromagnetic coil R2 are connected in series, and the initial action button switch ST has a contact MC of the electromagnetic coil MC. A holding circuit is provided.

Therefore, in the grain tank 5, an arbitrary continuous moisture measuring device 18 such as an infrared moisture meter is installed in the grain flow part in the grain tank 5.
A timer 20 capable of measuring drying time is installed in the operation box 19 of the machine 1, and a control circuit 21 connects the circuit of the timer 20, the moisture measuring device 18, and the electric motor 14. are connected to each other so that the drive transmission 14 for the shell circulation process is stopped by the operational output of either the timer 20 or the moisture measuring device 18.

Next, regarding the control circuit 21 in FIG. 4, the moisture measuring device 18
The output side of the moisture detection circuit 22 is branched into two directions, one of which is connected to one input terminal of a comparator 23, and a variable resistor 24 for setting a predetermined moisture content is connected to the other input terminal of the comparator 23. The output side of the comparator 23 is connected to the electromagnetic coil R1.

The other branched output side of the moisture detection circuit 22 is connected to one terminal of a setting button switch ST and a display 26 via a pigeon converter 25b. The other terminal of the button switch ST is connected to the input side of a calculation mechanism 27 having a memory section, and the variable resistor is connected to the input side of the other side of the calculation mechanism 27 via an AD converter 25a. 24, the output side of the calculation mechanism 27 is connected to one side terminal of the comparator 31, and the timer 20 connected to the control circuit 21 has one end side of its oscillator 28 connected to the button switch ST. However, the other end is connected to the other terminal of a comparator 31 via a frequency divider 29 and a counter 30, and the output side of the comparator 31 is connected so as to be input to the electromagnetic coil R2. Since the present invention is configured as described above, raw grain is fried and filled in the upper grain tank 5 via the elevator 16,
Now, to explain the case where the moisture content of the grain is 24%, the desired moisture content after drying is 14%, and the required drying time is 12.5 hours, the variable resistor 24 of the moisture measuring device 18 is operated. When the desired moisture content (14%) is set using the button, the fire heat generator exhaust fan 15 is activated initially, and the initial activation button switch ST on the operation box 19 is pressed, the electromagnetic coil MC of the electromagnetic contactor is energized as shown in FIG. to close contact MC,
Therefore, the electric motor 14 is driven, the grain is circulated inside the machine, and the hot air from the fire heat generator passes through the drying chambers 3, 3 to dry the grain, but at the same time as this action starts, as shown in FIG. The timer 20 and the moisture meter 18 operate together, and the moisture meter 18 side communicates the grain moisture content (24%) in the grain tank 5 to the comparator 23 and compares it with the set value of the variable resistor 24. The output value from 23 is communicated to electromagnetic coil R1.

The measurement signal of the moisture detection circuit 22 is also input to the oil converter 25b, one is sent to the display 26, and the other is sent to the button switch S.
The signal is input via T to one terminal of a calculation mechanism 27 equipped with a memory section. Further, the output of the variable resistor 24 which has set the desired moisture content (14%) is output from the comparator 23 and the pigeon converter 2.
5a, and the output of the converter 25a is input to the mechanism 27 from the other terminal of the calculation mechanism 27, and the calculation mechanism 27 repeats the toggle operation based on the above two inputs, and the moisture content measured by the moisture measuring device 18 is The difference (10%) between the measured value and the moisture content set in the variable resistor 24 is calculated, the calculated value is stored in the memory section, and the switch ST is closed. Next, on the timer side, the pulses of the oscillator 28 are converted to an appropriate low frequency by a frequency divider 29, and the output thereof is input to a counter 30 to start counting and output to a comparator 31. Then, in the comparator 31, when the output of the calculated value of the drying time (12 hours) calculated by the calculation mechanism 27 and stored in the memory section and the output of the time counted by the timer 20 reach RlJ, The output demagnetizes the electromagnetic coil R2, and the normally closed contact R2 in Figure 3
is opened and the rotation of the electric motor 14 is stopped. Further, as the drying action of the grain tank 5 progresses, the output value set in the variable resistor 24 and the output value of the detection circuit 22 receiving the signal from the moisture measuring device 18 are determined in the comparator 23 at RlJ.
When this happens, the electromagnetic coil R1 is demagnetized by the output, the normally closed contact R1 is opened, and the rotation of the electric motor 14 is stopped. In short, the present invention provides normally closed contacts Rl and R2 of two operation stop relays in the drive electric circuit 17 provided in the shell circulation process A of the drying device, and also provides an arbitrary contact point installed in the grain bin 5. When the comparison value between the output of the moisture detection circuit 22 of the continuous moisture measuring device 18 and the output set in the variable resistor 24 becomes the same, one electromagnetic coil R1 of the relay is opened and the motor 14 is stopped. Then, the signal from the moisture measuring device 18 is sent to the comparator 3 via the oil converter 25b and the calculation mechanism 27.
1, the calculation mechanism 27 is connected to set an arbitrary drying time corresponding to the grain moisture value in the grain tank 5, and its output and the output from the counter of the timer 20 are connected to the comparator 31. When a predetermined time has elapsed, the comparator 31 opens another electromagnetic coil R2 of the relay to stop the motor 14, and the drive motor 14 for the shell circulation drying process is stopped by one of the operational outputs. It is something that can be done.

As explained above, according to the present invention, at the start of the drying process, the desired finished dry moisture content can be easily set using a button switch, and the moisture content of the grain can be automatically measured using a moisture meter. The operating time is set, and the motor is automatically stopped depending on the operating action of either the moisture measuring device or the timer for the set moisture content or operating time. Even if there is a malfunction or fluctuation in any of the operations, the electric motor is stopped and the shell material circulation process is immediately stopped when a predetermined drying time or a predetermined moisture content is achieved. This method has remarkable effects such as completely preventing the generation of harmful grains such as grains and ensuring that dried grains with a predetermined moisture content can always be accurately expected.

[Brief explanation of the drawing]

The drawings illustrate embodiments of the present invention; FIG. 1 is a partially cutaway side view of a dryer embodying the present invention, FIG. 2 is another side view thereof, and FIG. 3 is a driving electric circuit diagram thereof; FIG. 4 is a block diagram illustrating the control circuit. 1... Airframe, 2... Hot air chamber, 3... Grain channel, 4
...Exhaust room, 5.Grain tank, 6.Elevator, 7.
・・Dispersion board, 8・・Conveyor, 9・・Discharge valve, 1
0... Grain flow tank, 11... Conveyor, 12... Grain feeding opening section, 13... Rotation transmission means, 14... Electric motor, 1
5... Exhaust fan, 16... Indicator, 17... Electric circuit, 18... Moisture measuring device, 19... Operation box, 20... Timer, 21... Control circuit, 22・・・
- Moisture detection circuit, 23... Comparator, 24... Variable resistor, 25a, 25b... Pigeon converter, 26... Display, 27... Calculation mechanism, 28... Oscillator, 29...
・Frequency divider, 30... counter, 31... comparator,
Ah... Grain drying process, Rl, R2... Electromagnetic coil.

Claims (1)

[Claims] 1 A grain flow path, a hot air chamber, and a ventilation chamber are installed in parallel, and a fire heat generator,
In a drying device in which a grain tank is combined with a drying section body equipped with an air exhaust fan, normally closed contacts of two movement stop relays are provided in the drive electric circuit provided in the grain circulation process of the drying device, and the grain The output side of the moisture detection circuit provided in the control circuit connected to any continuous moisture measuring device installed in the tank is branched into two directions, one of which is connected to one input terminal of the comparator, and the other side of the comparator is connected to one input terminal of the comparator. A variable resistor for setting a predetermined moisture content is connected to the input terminal of the comparator, the output side of the comparator is connected to one electromagnetic coil of the operation stop relay, and the other branched output side of the moisture detection circuit is connected to the output side of the comparator. It is connected to one input terminal of the calculation mechanism via an AD converter, and the variable resistor is connected to the other input terminal of the calculation mechanism via the AD converter, so that the output side of the calculation mechanism and the The output side of a comparator whose input side is connected to the output side of a timer connected to a control circuit is connected to another electromagnetic coil of the relay, and the operation output of either the moisture measuring device or the timer is used to control the grain circulation process. A drying automatic stop device for a grain dryer that stops the drive motor.