JPS5916791Y2 - Circulating grain dryer equipped with automatic moisture content measuring device - Google Patents

Description

[Detailed description of the invention] The present invention relates to a circulating grain dryer equipped with an automatic moisture content measuring device, and more specifically, the dryer is controlled while measuring the moisture content of grain with the automatic moisture content measuring device, Furthermore, the present invention relates to a device that automatically shuts down the dryer, and is capable of restarting the dryer circulation system, excluding the fuel system, when checking the moisture content after the dryer is stopped.

In recent years, grain dryers equipped with automatic moisture content measuring devices that automatically measure the moisture content of grains and automatically stop the dryer when a predetermined moisture content is reached have become widespread. It is also possible to set the drying time using a timer based on the user's experience to achieve a predetermined moisture content without installing such an automatic moisture content measuring device.

Therefore, an automatic moisture content measuring device has to be an optional product, and when it is installed in a dryer, it can be installed easily and quickly without special processing on the control circuit of the dryer. Therefore, they are designed to have mutually independent control circuits and to minimize the number of connection signal lines.

Furthermore, a power source for the automatic moisture content measuring device is provided independently from a power source for the dryer so that it can be used as an independent moisture meter unrelated to the dryer.

By the way, in a dryer equipped with an automatic moisture content measuring device,
The dryer is automatically stopped when the measured moisture content of the grain falls below the set target value, and the grain is then discharged from the dryer.However, if a power outage or other trouble occurs at this time and the dryer stops. It is necessary to check the moisture content of grains by taking this into consideration.

However, in the past, this confirmation work was carried out by pressing the manual measurement button to collect grain from one location, which was held so that it would not automatically stop and circulate using an automatic moisture content measuring device, and then measuring the moisture content. Because I am doing
If a large amount of immature rice happens to be mixed in the area and a high moisture content is measured, the automatic moisture content measuring device may be mistaken for failure or malfunction and stoppage, resulting in a re-drying process, which may reduce the quality of the grain. there were.

On the other hand, in order to restart the dryer at this time, the automatic moisture content measuring device must be turned off and then turned on again in order to release the dryer from being stopped by the automatic moisture content measuring device. If the operating section of the control circuit of the dryer is separated, it is troublesome to operate, and there is a risk that restarting the fuel pump will restart drying, resulting in overdrying.

Furthermore, if such an operation were to become commonplace and performed even during drying work, it would be undesirable because it would erase stored information.

The present invention was developed in view of these circumstances. Immediately after the dryer is automatically stopped by the control circuit of the automatic moisture content measuring device, the drive circuit of the dryer circulation system is restored again, and the dryer control unit is automatically stopped. To provide a circulating grain dryer equipped with an automatic moisture content measuring device capable of accurately checking the moisture content by manually circulating the grain and taking grain samples from multiple locations and measuring their moisture content. It is something.

Hereinafter, one embodiment of the present invention will be specifically described with reference to the drawings.

In Fig. 1, reference numeral 1 indicates the dryer main body, and the second dryer main body 1 has a hot air generator 2 and a dryer control unit 3 at a relatively low place in the front, and a dryer control unit 3 is located on the side of the main body away from these. An automatic moisture content measuring device 4 is installed at a high place, and a fan 5 for sucking hot air is installed at the rear of the main body.

Further, as shown in FIG. 2, the control circuit 6 of the automatic moisture content measuring device 4 is connected to a power source 7 via a switch SW, and is connected to the fan 5, the elevator, and the screw conveyor for grain distribution and transportation. , a relay FAN that drives or automatically stops a grain circulation system such as a feed roll, a relay FUEL that drives or automatically stops a fuel pump of the hot air generator 2, and the like.

On the other hand, the dryer control unit 3 has the contacts FAN', FT; EL', etc. of the relays FAN and FUEL, and is connected to a separate power supply 10.
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As shown in FIG. 3, the dryer control unit 3 includes a drive circuit 11 for the fan and circulation system, a push button switch PB for emergency stop, a normally closed contact FAN' of the relay FAN, and a push button switch PB2 for operation. , drive relay CR, are connected, and their relay contacts CR1' are connected in parallel with pushbutton switch PB2.

Further, a fuel pump drive circuit 12 branches from this circuit 11, and a normally open contact FUEL' of a relay FUEL, a push button switch PB3 for operation, and a relay CR2 are connected to this circuit 11, and the relay contact CR2' is connected to a push button switch. P.B.
3 are connected in parallel.

In addition, P is the fuel pump, TM is the timer, TSWl, TS
W2 is a contact that operates with the timer TM, and when the automatic moisture content measuring device is not installed, it operates as an automatic stop timer contact, and even when the measuring device is installed, it operates as a security timer contact. do.

In this way, contacts FAN' and FUEL' are both closed at first, and when pushbutton switch PB2 is first turned on, relay CR1 for driving the fan and circulation system is energized, and contact CR
1' self-maintaining, fan and circulation system drive circuit 1
1 continues to be energized, the fan rotates, and the grain is circulated in the dryer.

Next, when pushbutton switch PB3 is turned on, relay CR is activated.
2 is energized and self-held by contact CR2', the drive circuit 12 of the fuel pump P continues to be energized, and hot air is generated by combustion of the fuel to perform drying.

When the drying process is completed, the normally closed contact FUEL' is
is opened by the excitation of the relay FURL, the self-holding of the relay CR2 is released, and the generation of hot air is stopped as the fuel supply is cut off by stopping the fuel pump P.

Next, the normally closed contact FAN' is opened by the excitation of the relay FAN, and the self-holding of the relay CR is released, and the fan drive and grain circulation operation are stopped. is once disconnected, and the relay FA
According to the present invention, as described later, the energization of the contact FA
N' closes again by demagnetizing its relay FAN, allowing the circulatory system to restart.

The control circuit of the automatic moisture content measuring device, which is the main focus of the present invention, will be explained with reference to FIG. 4. Reference numeral 13 is a measuring device that crushes and clamps grains, measures resistance, and generates a signal obtained by logarithmically converting the resistance value. , 14 is an integration circuit, 15 is a measurement level comparison circuit, 16 is a measurement interval control circuit, 17 is a measurement count circuit, 18 is a measurement flag circuit, 19 is a 1.75 second clock pulse generation circuit, and 20 is a two-stage cutoff. Flag circuit, 21 is a measurement timer circuit, 22 is an immature rice suppression circuit,
23 is an immature rice suppression flag circuit, and 24 is a stop circuit.

In the measuring machine 13, the sample pan is initially in the standby position and the limit switch WTLS is open, and the sample pan is moved forward to collect grain by the operation of the motor, and at the forward end of the sampling position, the limit switch FWLS is opened and stopped. , after a certain period of time, the motor reverses and moves backward, and the limit is reached at the backward end of the measurement position)
・Switch BWLS is opened.

When the power is turned on, NOR game 1 is activated by the INIT signal.
- Counter C- of the measurement number counting circuit 17 via G-1
A 1 is loaded and set to a count of 11, thereby generating an AUTO signal on the output QD.

On the other hand, the INIT signal causes the flip-flop of the measurement flag circuit 18 to go to a low level (hereinafter referred to as "low level").

Since the sample dish is in the standby position, limit switch WTLS
is open and FWLS is closed.

Since gate G-A is inhibited by the AUTO signal, the outputs of gates G-2 are at bi-level (hereinafter referred to as H).

Therefore, gate G-3 is turned on, relay FWD for forward rotation of the motor is activated, the motor is rotated forward, and the sample dish moves forward and enters the dryer.

When the limit switch FWLS is pressed and opened at the forward end,
Game) The input of G-2 becomes H, the output becomes L,
Game) G-3 is prohibited, relay FWD is inactive, and the remoter is stopped.

On the other hand, due to the operation of the limit switch FWLS, NOR
The output of G-4 becomes L, and the delay counter C-2
, and the output Q of the free-running oscillator B-1 of the 1.75-second clock pulse generation circuit 19 starts counting.

When the count reaches 8, the output QD of the counter C2 becomes H, and the inputs of the gate G-5 both become H, so its output becomes L.

At the 16th count, when the output QD becomes L, the gate t-
The output of G-5 becomes H, causing the measurement flag circuit 18 to fluctuate.

The output Q of Floraf 10F-1 becomes H, and the output Q becomes L.

Since the limit switch BWLS is closed, game)G
-6 inputs both become H, turning on and relay BAK
is activated, the motor reverses, and the sample pan begins to move backward.

After the sample dish advances and stops in this manner, it retreats after a certain period of time, during which time a sample is collected on the sample dish.

The retraction of the sample dish closes the limit switch FWLS and clears the delay counter C-2.

When the limit switch BWLS is activated and opened at the backward end of the sample dish, the gate) G-6 is prohibited, the relay BAK is inactivated, and the remoter is stopped.

At the same time, the delay counter C-2 starts counting the output pulses of the 1.75-second clock generation circuit 19 in the same way as when the limit switch FWLS is opened.

When the counter C~2 counts to 6, its output QB becomes H, and the output QC also becomes H.

On the other hand, since the limit switch BWLS is open, the inputs of the three-man NAND cables 1-G-7 both become H, and their outputs become L, activating the switch circuit S-1 and closing the switch SW-1.

Therefore, the output of the measuring device 13 is integrated by the integrating circuit 14.

When the counter C-2 counts 8, the output QD becomes H, and the input conditions of the NAND gate G-8 are satisfied, and its output becomes L.

This output indicates that one measurement has been completed.
This signal resets the flip-flop FF-1 of the measurement flag circuit 18 via the gate G9, and the motor forward rotation relay FWD is activated, the motor rotates forward again, and the sample plate begins to move forward.

Further, the signal is sent to the counter C- of the measurement number counting circuit 17.
Enter 1, count 1 count, and reach count 12.

At the same time, the outputs QB and QC of the counter C-2 become L, the output of the gate G-7 becomes H, and the switch SW1 opens and the integration ends.

When the sample dish moves forward, limit switch BWLS closes.
Counter C-2 is cleared again.

While the sample dish is moving forward, the standby limit switch WT
Open LS, input to G-A becomes H, but AU
Since gate G-A remains inhibited by the TO signal, the motor does not stop.

The above operation is repeated, and the number of measurements is counted by the counter C-1 of the counting circuit 17. When the fifth measurement is completed, the count returns to O, and the output QD becomes L.

As a result, when the limit switch WTLS is opened, even if the AUTO signal inhibits the gate (G-A),
The output of G-A becomes L, G-3 is inhibited via gate G-2, relay FWD is deactivated, and the sample plate is stopped at limit switch WTLS.

The integrated value of the measured values from each of the above five measurements is the comparator circuit 1.
5 is compared with the set level.

The comparison circuit includes three comparison circuits F-1, F-2,
F-3 is provided, F-1 has the lowest comparison level, this becomes the target value, and the resistance R is adjusted so that F-3 becomes the highest.
1, R2, and R3.

The integrated voltage is supplied to the inverting input of each comparator circuit by a voltage dividing circuit of R4, R1, and R5.

Furthermore, the reference voltage to the comparator circuit can be changed by changing the resistance value of the rotary switch RS.

That is, the level of each comparison circuit can be changed up or down as a whole using the rotary switch R3.

Therefore, the voltage integrated by the integrating circuit 14 is compared by the comparing circuit, but as the integration progresses, the voltage integrated by the comparing circuit F-1
The reference voltage is reached sequentially as F-2, F'-3-\, and when the integrated value becomes higher than each reference voltage, the output of each circuit becomes L.
become the level.

In this case, if the moisture content is high, up to F-3 will become soil, but if the moisture content is low, F=3 or F-2 will not become L and will remain H.

For example, F-3 has a moisture content of 18% and becomes L, and F-2 is 16,
It becomes L at 3%, and F-1 becomes L at 15%.

The output of each comparison circuit is the counter C of the measurement interval control circuit 16.
-3, and when the carry output CA of the counter C-1 of the measurement number counting circuit 17 becomes H, the load is fixed, and the current input is applied to the inputs B, C, I]. loaded into.

After that, the counter C-3 counts the output pulses of the 7.5-minute clock pulse frequency divider circuit B-2, and at the 16th count L input, the carry output CA becomes L, and the counter C-1 is loaded again. The next measurement starts.

For example, as a result of comparing the integrated values, F-3, F-2, and F-1 are all L. That's it (more than 18%). C-3 is loaded to 0 count, and when the 16th pulse is L input (about 12
After 0 minutes, the carry output becomes L.

Similarly, if only F-3 is high, C-3 is loaded to 8 counts, and at the 8th pulse (approximately 60 minutes later), if F-3 and F-2 are high, C-3 is It is loaded to 12 counts and the carry output becomes L at the 4th pulse (about 30 minutes later).

Next, when the moisture content reaches the target value or less, all outputs up to the comparator circuit F-1 become t.

At this time, the output of F-1 (output C0FF) is the first stage flip-flop FF- of the two-stage cutoff flag circuit 8.
2, and the carry output CA of the measurement count circuit 17 is H, which activates the flip-flop FF=2 through the gate t-G-10, and the output Q becomes H, and the drying reaches the target value. remember things.

Next, the measurement is restarted after about 15 minutes, and when the five measurements have been performed, if the integrated value is again below the target value, the next stage of the two-stage cutoff flag circuit 20
-3 input, output C0FF and first stage flip-flop F
Since the output Q of F-2 is applied, the carry output CA of the measurement number counting circuit 17 causes the flip-flop FF to
-3 is reversed.

Then, as the output Q becomes L, the gate G-1
1 becomes L and relay FUEL is energized as shown in FIG.

The normally closed contact FUEL' opens, cutting off the power to the fuel pump P and stopping the generation of hot air.

Then, after about 4 minutes, the output Q9 of the frequency dividing circuit B-2 becomes H, and the output of the circuit G-11 also becomes H.

In addition, since the Q of F-5 under the flip-flow rough set in the set state by the INIT signal is H, the output of G-14 becomes L, and the relay FAN is energized, and the normally closed contact FAN' shown in Fig. 3 is turned on. is opened, power to the fan and circulation system drive relay CRI is cut off, and the drying work is completed.

When the drying operation of the dryer is automatically stopped by the automatic moisture content measuring device, as shown in the time chart of FIG.
-2's output Q1 is used as a clock signal, it is latched by F-5 under the flip flow rough, and as the output becomes either Q or L, the output of G14 becomes H, and the energized relay FAN is demagnetized. At the same time, the clock input to the frequency dividing circuit B-2 is also prohibited by the gate 1-G-13, and subsequent automatic measurement operations are prohibited.

With this configuration, the normally closed contact FAN' in the drive circuit 11 of the drying circulation system is closed by the relay FAN immediately after the drying operation of the dryer by the automatic moisture content measuring device is completed, so the circuit 11 is automatically closed. When the power returns to a state where it can be energized, just by turning on the push button switch PB2, the dryer circulation system is activated and the grains that are being circulated without being exposed to hot air are taken out from multiple locations and their moisture content is measured. It becomes possible to check the moisture content.

Note that the present invention is not limited to the above-mentioned embodiment, and as shown in FIG.
-) The output of G-11 is directly input to the gate G-14, and the output is manually input to the gate G-14 via the delay line DL and an inverter, and as shown in FIG. When the output of delay line DL becomes H after a predetermined period of time has passed after the output of G-11 changes from L to H, it is reversed and the output of G-14 is changed to H.
and demagnetize the relay FAN, and divide the frequency divider circuit B=2.
It is also possible to prohibit the clock input to the

As described above, according to the present invention, it is possible to check the moisture content of the grain while circulating the grain after the completion of the drying operation, making the check very accurate.

In addition, in this case, there is no need to turn off the power to the control circuit of the automatic moisture content measuring device and then turn it on again, and the operation is easy because all you have to do is push the button on the dryer control unit. It is.

Furthermore, since the relay FUEL for driving the fuel pump is held open, there will be no inconvenience such as erroneous generation of hot air and drying.

[Brief explanation of the drawing]

Figure 1 is a side view showing the arrangement of the control unit and automatic moisture content measuring device in the dryer, Figure 2 is a circuit diagram showing the connection relationship between the two, Figure 3 is a circuit diagram of the dryer control unit, and Figure 4 is a circuit diagram of the dryer control unit. The figure is a circuit diagram of the measuring device control circuit, Figure 5 is a diagram of a time chart, Figure 6 is a circuit diagram of the main part of another embodiment of the present invention, and Figure 7 is a diagram of its time chart I. It is. DESCRIPTION OF SYMBOLS 1... Dryer body, 2... Hot air generator, 3... Dryer control section, 4... Automatic moisture content measuring device, 5... Suction fan, 6... Measuring device control circuit , 7, 10...
Power supply, 11... Drive circuit for circulation system, etc., 12... Fuel pump drive circuit, 13... Measuring device, 14... Integrating circuit, 15... Measurement level comparison circuit, 16... Measurement Interval control circuit, 17... Measurement number counting circuit, 18...
Measurement flag circuit, 19... 1.75 second clock pulse generation circuit, 20... Two-stage cutoff flag circuit, 21
...Measurement timer circuit, 22...Immature rice suppression circuit,
23... Immature rice suppression flag circuit, 24... Stop circuit.

Claims (1)

[Scope of utility model registration request] The dryer body has an automatic moisture content measurement device and a dryer control section, and power is supplied to the control circuit of the automatic moisture content measurement device and the dryer control section separately, and the dryer is controlled by a signal from the control circuit. In a circulating grain dryer equipped with an automatic moisture content measuring device that controls the circulation system drive circuit of the control section and the fuel pump drive circuit that generates hot air, the circulation system and fuel are controlled by a signal from the control circuit at the end of drying work. The pump is characterized in that the pump drive circuits are shut off together to automatically stop the pump, and immediately after that, only the circulation system drive circuit is returned to operable by a signal from the control circuit, thereby making it possible to restart the circulation system. A circulating grain dryer equipped with an automatic moisture content measuring device.