JPS622474Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention uses an automatic moisture detection sensor that detects the moisture value of sampled grains by reading changes in resistance, and compares the detection signal sent from the sensor with the result. This invention relates to an automatic control device for a grain drying device, which is connected to a control circuit that sends out an operating signal to the output side, and an operating section of a drying section is connected to the output side of the control circuit.

The automatic control device of the grain drying equipment samples the moisture value of the grains being dried at regular intervals, detects it with an automatic moisture detection sensor, and generates hot air based on the detection signal. The automatic moisture detection sensor controls the operating section of the drying section of the device, and for example, the moisture value at the time of an error detected during the drying process when no grains have been sampled determines the set moisture measurement range. When an extremely low abnormal value is detected, the burner (electromagnetic pump) and the entire device are stopped together based on the error signal at that time. There was a problem that if it was left unused, it would become stuffy or change in quality.

Therefore, this idea is based on an automatic moisture detection sensor that
When an error signal is detected, instead of stopping the burner and the entire device at the same time, the operating parts are activated with a time difference based on the detection signal and moisture value detected during the previous sampling at the time of the error. The purpose of this control is to enable operation control to be handled in an optimal state in the event of an error.

In this invention, as a means to achieve this purpose, an automatic moisture detection sensor that detects the moisture value of sampled grains is connected to the input side, and a burner, blower, motor for the circulation system, etc. are connected to the output side. When the detection signal at the time of sampling sent out from the automatic moisture detection sensor is a moisture value within the set moisture measurement range, the control circuit connected to the operating part of the drying action part of the burner/air blower is controlled based on the moisture value. - Sends an operating signal to the output side to control the operating part of the motor in the circulation system, and when the detection signal is an extremely low abnormal value exceeding the moisture measurement range, based on the previously detected moisture value, If the moisture value is greater than or equal to a predetermined moisture value set within the moisture measurement range, an activation signal is sent to the output side to stop only the burner of the actuating section, and the previous moisture value is set as the predetermined moisture value. In the following cases, an automatic control device for a grain drying device characterized by having a circuit configuration that sends to the output side an operation signal that stops the blower and the motor of the circulation system with a time difference after a certain period of time has elapsed after the burner has stopped. This is to raise the following.

Next, embodiments will be described in detail based on the drawings.

In FIG. 1, reference numeral 1 denotes the body of a grain drying apparatus A, and a grain tank 10 into which grains to be dried are placed is installed in the upper half of the internal cavity.

2 is a machine body 1 for putting grains into the grain bin 10
The grain lifting machine is installed in parallel on one side (front side) of the grain lifting tower 2.
The grain lifting tower 20 is similar to the conventional one in that it works to send grains upward using buckets 21a... of a bucket conveyor 21 mounted endlessly in the inner cavity of the grain bin 10, and the lower end of the grain lifting tower 20 is connected to the conveying direction terminal end of the lower conveyor 11 located below the outlet at the bottom of the grain bin 10, and the upper end is connected via a switching shutter to the upper conveyor 12 used to feed grains into the grain bin 10, and to an extraction trough 22 for removing grains that have finished drying.

3 is a hot air supply device that generates and supplies hot air (dry air), and includes a burner 30 that burns fuel supplied by a pump (electromagnetic pump);
A blower 31 for sending hot air generated by the operation of the grain to the grains, which is formed of a perforated plate or a mesh body and communicates with an air guide path 13 installed in the body 1, By operating the blower 31, the hot air generated by the burner 30 is transferred from the air guide path to the grain tank 1.
0 (or the grain flow path) and is discharged outside the machine.

The burner 30 is configured so that its operation is controlled by a solenoid valve (not shown) provided in a fuel pipe 33 communicating with the fuel tank 32 and the pump.

Reference numeral 4 denotes an automatic moisture detection sensor that detects the moisture value of the grains based on the automatic moisture detection process L as shown in FIG. 6 when the grains are dried in the grain drying device A. The automatic moisture detection sensor 4 has a third
As shown in Fig. 4, a take-out port 23 for taking out the grains to be sampled is opened at the bottom of the grain lifting tower 20 of the grain lifting machine 2, and the inner cavity of a case 24 is attached so as to surround the take-out port 23. A guide trough 40 is installed so as to communicate with the outlet 23, and below the guide trough 40, a pair of crushing rolls 41, 41 are placed facing each other and are driven and rotated by a major motor M via a speed reduction device m. The crushing rolls 4
The peripheral surfaces of the crushing rolls 1 and 41 are configured to serve as electrical contacts, and the presence of grains in the opposing gap between the crushing rolls 41 and 41 allows the crushing rolls 41 to conduct and close the electric circuit. When the crushing rolls 41, 41 crush the sampled grains, the moisture value is detected by detecting the electric resistance value of the current flowing between the crushing rolls 41, 41. It is the type of thing that
The upper limit of the moisture measurement range based on electrical resistance is approximately 24%, which is the moisture content of grains that do not cause crushed pieces to stick to the roll surface when crushed by the crushing rolls 41, 41.
(resistance value indicates a low value) to a lower limit of 12.5% (resistance value indicates a high value), and the automatic moisture detection sensor 4 performs detection without sampling grains. In some cases, an error signal or detection signal with a high resistance exceeding the lower limit of the moisture measurement range is output.

Note that the extraction port 23 for sampling grains is
It is equipped with a shutter 42 that opens and closes, and the shutter 42 is connected to a solenoid 43 that operates at predetermined time intervals, thereby opening the outlet 23 at regular intervals and performing a sampling operation at the time of opening. It is designed so that 5 is a hot air temperature detection sensor for detecting the temperature of the hot air sent from the hot air feeding device 3, and its temperature sensing part 50 is placed facing into the air guide path 13 through which the hot air flows, In this example, the burner 30 is installed at a slightly distant position. 6 is an electronic switching circuit (multiplexer circuit), which is an IC that outputs a detection signal from the input side to the output side, and on the input side, the automatic moisture detection sensor 4, the hot air temperature detection sensor 5, and the variable resistor R1, R2 (variable volume) is connected.

Of the variable resistors R1 and R2, one variable resistor R1 is for setting the final drying value (moisture value) of the grain, and in this example, it is set within the range of 12.5% to 18.2%. I have made it possible for you to do so. Also,
The other variable resistor R2 is for setting the hot air temperature, and in this example, it can be set within a range from a minimum of 15°C to a maximum of 75°C.

Reference numeral 7 denotes an AD conversion circuit which converts an analog detection signal into a digital detection signal and outputs the same.The electronic switching circuit 6 is connected to the input side of the AD conversion circuit 7, and the control circuit 8 is connected to the output side.

The control circuit 8 has on its input side a first contact t1 that operates at the 8th hour and a second contact t1 that operates when the voltage becomes zero.
The AD conversion circuit 7 is connected to a 24-hour timer T equipped with a contact t2, an operating circuit W equipped with a tensioning switch S and a drying switch S1, and a hot air supply device 3 is connected to the output side. burner 30 (pump) and blower 31 or bucket conveyor 2
An operating unit 9 such as a circulation system motor (not shown) that drives the first unit, and a display unit L that lights up and displays a hot air temperature lamp L1, a moisture value lamp L2, an error lamp L3, etc. are connected. These are a program that instructs the automatic moisture detection sensor 4 and the hot air temperature detection sensor 5 to periodically measure at fixed time intervals, and a moisture value lamp L2 and hot air temperature lamp L1 that digitally display the moisture value and hot air temperature during measurement.
In addition to the program that displays the data, the final drying value of the grain and the hot air temperature set by the variable resistors R1 and R2 are stored, or the timer T is set to 12 hours and the data is displayed after a predetermined period of time. 1 contact t1 is turned on, and when it is confirmed from these input signals that the drying switch S1 is turned on by being pressed with a finger, the automatic moisture detection sensor 4 is notified as shown in Fig. 6. Crushing rolls 41, 41
The crushing roll 4 is rotated for 1 minute to clean the surfaces of the rolls 41, 41, and the shutter 42 is opened after 2 seconds and the crushing roll 4 is in a stopped state.
Sample the grains during drying on 1,41,
Moisture detection step L, which operates in the following order: a 4-minute sampling cooling step b in which the sample is left to cool, and a 4-minute moisture detection step c in which the moisture value is detected by rotation of the crushing rolls 41, 41 (arrow A) after 2 seconds. program, or the resistance value exceeding the lower limit of the moisture measurement range in the event of an error in which the automatic moisture detection sensor 4 detects an unsampled state due to mechanical trouble or mixed straw waste, etc., in which grains are not sampled. A program, etc. that controls the above-mentioned operating section 8 by inputting a high error signal (detection signal) is pre-installed, and when it is in a normal state, the detection signal sent from the automatic moisture detection sensor 4 is compared with the programmed data. For example, the variable resistance R1 is 16%.
When the final drying value (moisture value) of the grains set in 2 matches the detection signal sent from the sensor 4, an operating signal is sent to the output side to stop the operating section 9 of the drying section. If a trouble occurs in the sampling operation and the automatic moisture detection sensor 4 performs detection without being sampled, and the moisture value at the time of the error is an extremely low abnormal value exceeding the moisture measurement range, the moisture value at the time of the error An operation signal that stops only the burner 30 in the operation section 9 based on the moisture value detected during the previous sampling at the time of error, and the burner 3
After a predetermined period of time has elapsed since the zero stop, an activation signal is sent to the output side to stop the circulation system motors and the like that drive the blower 31 and the bucket conveyor 21 with a time difference.

In addition, only the burner 30 is stopped based on the moisture value detected during the previous sampling at the time of the error.
Alternatively, a desired value may be set within the moisture measurement range as a reference for outputting an activation signal to stop the circulation system motor etc. that drive the blower 31 and the bucket conveyor 21 with a time difference after a certain period of time has elapsed after the burner 30 has stopped. In this example, the predetermined moisture value to be kept is 18%, and the moisture value at the lower limit of the moisture measurement range, which outputs an error signal as an abnormal value, is set to 12.5%.
An error signal is issued as an abnormal value when the value is less than 12.5%, and if the detected value at the previous sampling was 18% or more, the burner 30 of the hot air supply device 3 is stopped and , crushing roll 41,
41 for 4 minutes, and the blower 31 and circulation system motor etc. are now rotated until the timer T runs out (the second contact t2 turns off), and the detected value at the previous sampling is 18. %, the burner 30 of the hot air supply device 3 is stopped, and the blower 31 is stopped 1 minute after the rotation of the crushing rolls 41, 41 is stopped for 4 minutes, and 5 minutes after the burner 3 is stopped. The circuit configuration is such that an activation signal for stopping the motors of the circulation system, etc. is output.

Next, to explain the function and effect, the automatic control device for the grain drying device according to the present invention, as described above, connects the automatic moisture detection sensor that detects the moisture value of sampled grains to the input side, and connects the automatic moisture detection sensor to the output side to detect the moisture value of the sampled grains. When the detection signal at the time of sampling sent from the automatic moisture detection sensor is a moisture value within the set moisture measurement range, , sends an operating signal to the output side to control the operating parts of the burner, blower, and circulation system motor based on the moisture value, and once the detection signal is an extremely low abnormal value exceeding the moisture measurement range. Based on the previously detected moisture value, if the moisture value is greater than or equal to a predetermined moisture value set within the moisture measurement range, an operation signal is sent to the output side to stop only the burner of the operation section, and once If the previous moisture value is below the predetermined moisture value, the circuit is configured to send an activation signal to the output side that stops the blower and circulation system motor with a time difference after a certain period of time has passed after the burner has stopped. If the automatic moisture detection sensor 4 detects an abnormal value that exceeds the moisture measurement range while there is still a lot of moisture on the way, based on the moisture value detected during the previous sampling when the abnormal value was detected, If the measured moisture value is 18% or more, the burner 30 of the operating section 9 is stopped, and the blower 30 is turned on so that natural air flows through the grain tank 10 until the timer T that sets the drying time runs out. When an abnormal value is detected, the motor, etc. of the circulation system is started to operate, and when the temperature is below 18%, the burner 30 is stopped, and then the blower 30 and the motor of the circulation system are stopped after a certain period of time has passed. Then, the actuating section 9 is controlled based on the moisture value detected during the previous sampling.

Therefore, if the automatic moisture detection sensor 4 detects an abnormal value due to an error during drying, natural air is forced to flow inside the grain tank 10, thereby preventing an error in the moisture value detection operation. This can solve the problem of the control operation going out of order, causing smearing and deterioration of grains during drying.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a grain drying device embodying the present invention, Fig. 2 is a side view of the same, Fig. 3 is a cross-sectional plan view of the main parts of the above, and Fig. 4 is a vertical cross-sectional side view of the main parts of the above. ,
FIG. 5 is a block circuit diagram, and FIG. 6 is an explanatory diagram. Explanation of drawing symbols: A...Grain drying device, L1,
L2, L3...Lamp, M...Measure motor, m...Reduction gear, R1, R2...Variable resistor,
S, S1...Switch, T...Timer, W...
Operating circuit, 1... fuselage, 10... grain tank, 11...
Lower conveyor, 12... Upper conveyor, 13...
Air guide path, 2...grain lifting machine, 20...grain lifting tower, 21...
...bucket conveyor, 21a...bucket conveyor, 22
...Take-out gutter, 23...Take-out port, 24...Case,
3...hot air supply device, 30...burner, 31...
... Blower, 32 ... Fuel tank, 33 ... Fuel pipe, 4 ... Automatic moisture detection sensor, 40 ... Guide gutter, 41 ... Crushing roll, 42 ... Shutter,
43...Solenoid, 5...Hot air temperature detection sensor, 50...Temperature sensing section, 6...Electronic switching circuit, 7...
... AD conversion circuit, 8 ... control circuit, 9 ... operating section of drying action section.

Claims (1)

[Scope of utility model registration request] A control circuit is connected to the input side of the automatic moisture detection sensor that detects the moisture value of sampled grains, and the output side is connected to the operating parts of drying parts such as burners, blowers, circulation system motors, etc. When the detection signal sent from the detection sensor at the time of sampling is a moisture value within the set moisture measurement range, an operation signal is sent to the output side to control the operating parts of the burner, blower, and circulation system motor based on the moisture value. When the detection signal is an extremely low abnormal value exceeding the moisture measurement range, the moisture value is set to a predetermined moisture value within the moisture measurement range based on the moisture value detected the previous time. In the above case, an activation signal is sent to the output side to stop only the burner in the activation section, and if the previous moisture value is less than the predetermined moisture value, the blower and circulation system are activated after a certain period of time has passed after the burner is stopped. An automatic control device for a grain drying device, characterized by having a circuit configuration that sends an operating signal to an output side to stop a motor with a time difference.