JPS6129027Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention consists of a grain lifting machine that sends grain upwards, an upper conveyor for tensioning the grains sent up by the grain lifting machine into a grain tank, and a The grains are circulated and flowed by a lower transport conveyor that sends the grains packed in the grains to the grain lifting machine, and the grains are dried by being exposed to hot air (drying air) generated by a hot air supply device. This invention relates to an automatic control device for a grain drying device, and its purpose is to
The purpose is to use a simple circuit to stop the operation of a hot air supply device that generates hot air to stop combustion and prevent uneven drying and fires caused by partial overheating.

Next, to explain the embodiment in more detail based on the drawings, in FIG. 1, 1 is a grain drying device A.
The upper half of the inner cavity of the machine is equipped with a grain tank 10 into which grains to be dried are filled. Reference numeral 2 denotes a grain lifting machine installed on one side (front side) of the machine body 1 to load grain into the grain tank 10, and a bucket conveyor 21 endlessly installed in the inner cavity of the grain lifting tower 20. The buckets 21a act to send the grains upwards, which is similar to conventionally known ones, and the lower end of the grain lifting tower 20 is connected to the lower conveyor 11 provided below the outlet at the bottom of the grain tank 10 in the conveying direction. It communicates with the terminal end, and the upper end side is equipped with a switching shutter (Fig. (not shown). 3 is a hot air supply device that generates and supplies hot air (drying air);
As shown in the figure, fuel is supplied to a fuel chamber 31 by an electromagnetic pump 30.
It consists of a burner 32 for feeding hot air to the grains for combustion, and a fan 33 for feeding the hot air generated by the operation of the burner 32 to the grains. The fan 3
3 is formed as a suction fan and is communicated with the exhaust passage, and when the fan 33 operates, the burner 3
The hot air generated in step 2 flows from the air guide path to the grain tank 10.
(or the grain flow path), exits into the air exhaust path, and is discharged outside the machine.

The burner 32 is configured to be controlled by the electromagnetic pump 30 connected via a fuel pipe 35 so as to communicate with a fuel tank 34 .

4, when drying the grains in the grain drying device A, sample the grains being dried,
This is an automatic moisture detection sensor that detects the moisture value of the grain. The automatic moisture detection sensor 4 opens an outlet 23 for taking out the grains to be sampled at the lower part of the grain lifting tower 20 of the grain lifting machine 2, as shown in FIG.
A guide gutter 25 that communicates with the outlet 23 is installed in the inner cavity of the case 24 attached to surround the
The crushing rolls 40 and 40 are supported so that they face each other and are driven and rotated by a motor M through a deceleration position m, and the peripheral surfaces of the crushing rolls 40 and 40 are respectively configured to serve as electrical contacts. The grains are present in the opposing gaps of the crushing rolls 40.
and the crushing roll 40 are connected to the electric circuit so that the electric circuit is in contact with the crushing roll 40.
is a conventionally known method that detects the moisture value by detecting the electrical resistance value of the current flowing between the crushing rolls 40 and 40 when the sampled grains are crushed, and the measurement range based on the electrical resistance is as follows: It is set by the resistor R connected to the sensor 4,
The upper limit of the range for actually detecting appropriate measurement values is
Approximately 24, which is the moisture content of grains that do not cause crushed pieces to stick to the roll surface when crushed with crushing rolls 40 and 40.
%, the lower limit of which is set by the resistance R.
(12.5% in the example). The intake port 23 to be sampled is equipped with a shutter 26 that can be opened and closed, and the shutter 26 is connected to a solenoid L that operates at predetermined time intervals.
3 is opened, and a sampling operation is performed when the opening is made. Reference numeral 5 denotes a manual moisture detection sensor for detecting the moisture value in place of the automatic moisture detection sensor 4 when the moisture value of the grain to be dried is high, and is made small as shown in Fig. 8. The sampled grains are put into the inner cavity of the case 50, and the open port 51 is opened on one side of the case 50.
A crushing plate 53 is provided which comes into pressure contact with the tray 52 to be inserted and set into the inner cavity, and a screw rod 55 screwed onto the crushing plate 53 so as to move up and down with the rotation of the handle 54 is fixed to the crushing plate 53. The crushing plate 53 and the crushing plate 53 are each configured to serve as an electrical contact, and a terminal 56 formed in the shape of a plug is connected to this electrical contact. Reference numeral 6 denotes a control circuit, which has the function of comparing the detection signal inputted to the input side of the control circuit and sent out from the automatic moisture detection sensor 4, and sending the result to the output side as an operation signal of "H" level voltage; When the detection signal sent from the automatic moisture detection sensor 4 and the detection signal sent from the manual moisture detection sensor 5 are input at the same time, the detection signal from the manual moisture detection sensor 5 is prioritized and compared with that detection signal. The control circuit 6 has the function of sending the result to the output side as an operation signal of "H" level voltage, and the configuration of the control circuit 6 that achieves the above two functions may be designed as appropriate. In this embodiment, automatic moisture detection sensors 4 are installed on the input side X ₁ , X ₂ , and X ₃ .
manual automatic switching control unit 61 connected to the sensor circuit 40 of the manual moisture detection sensor 5 and the priority circuit 50 of the manual moisture detection sensor 5.
and automatic switching control that automatically switches to control by the automatic moisture detection sensor 4 when the hot air temperature to be controlled, the moisture value of the grain, and the moisture value detected by the manual moisture detection sensor 5 reach a predetermined moisture value. - Also connected is a command control unit 62 in which various control operations such as control of the solenoid 28 for operating the shutter 27 are programmed in advance. The command control section 6
2 is the input side X ₃ of the manual automatic switching control section 61;
For example, when a signal indicating that the grain moisture value has reached approximately 16% is input, it is compared with a pre-programmed signal from the command control section 62, and the result is sent as a command signal to the manual automatic switching control section 61. , Based on the command signal, the output side
This circuit outputs an activation signal to stop the operation. Further, the priority circuit 57 of the manual moisture detection sensor 5 is connected to the input side of the manual automatic switching control section 61.
The connection to X ₁ and X ₂ is as described above, but the circuit 57 is normally off and the priority circuit 5
The terminal 56 on the output side of the manual moisture detection sensor 5 is connected to the jack-shaped connection port 58 provided at the terminal 7 to turn on the moisture detection sensor 5. In this example, the priority circuit 57, which is turned on when the output side terminal 56 of the manual moisture detection sensor 5 is connected to the connection port 58, is connected to the manual moisture detection sensor on the input side of the command control section 62. Terminal 5 at the output end of 5
6 is connected to the connection port 58, the contact 59 is closed and the circuit 57a into which the signal current is input is connected, and when the signal current flows through the circuit 57a,
When the command control section 62 receives that the manual moisture detection sensor 5 is connected to the connection port 58, it sends an activation signal based on the detection signal of the manual moisture detection sensor 5 to the output side X of the manual automatic switching control section 61. When the output side terminal 56 of the manual moisture detection sensor 5 is pulled out from the connection port 58, the contact 59 is opened, thereby turning off the priority circuit 57.

In addition, in FIG. 4, the manual automatic switching control section 6
The resistors R ₁ and R ₂ connected to the input side of 1 are range switching resistors for setting the measurement range of the manual moisture detection sensor 5. It is set to detect moisture values up to 13%.

7 is an AND circuit provided in a connection circuit 70 that connects the output side of the control circuit 6 and the operating section 3a of the drying section (hot air supply device 3). AND circuit 7
outputs an "H" level signal to the output terminal c side when "H" level voltage signals are simultaneously input to the two input terminals a and b on the input side, and one of the two input terminals b When an "H" level signal is input to the terminal a and an "L" level signal is input to the other terminal a, an "L" level signal is output to the output terminal c side. However, the output terminal c side of the AND circuit 7 is connected to the operating section 3.
“H” connected to a and output to its output terminal c side
driving the actuating section 3a with a level signal;
The actuating section 3a is activated by outputting an "L" level signal.
One of the input terminals b of the AND circuit 7 is connected to the output side of the control circuit 6, and the other input terminal a is connected to the output side of the circulation operation detection circuit 8. There is a structure.

The circulation operation detection circuit 8 uses a sensor 80 to detect a rotation signal of a circulation motor (not shown) that drives the circulation operation section of the grain drying device A, in this embodiment, the bucket conveyor 21 of the grain lifting machine 2. When detected and operating normally, it sends an "H" level signal to the AND circuit 7, and when it has stopped due to mechanical trouble, it sends a "L" level signal to the AND circuit 7. As shown in Figure 5, a pulse oscillation circuit 82 that continuously sends a constant pulse signal to the input terminal 81a of the counter IC 81 is connected to the input terminal 81a of the counter IC 81, and the counter IC 81 receives the pulse signal of the pulse oscillation circuit 82 by a specified number, for example, 100 counts. Then, it is turned "on" and an "L" level signal is output to the output terminal 81c. Then, at the same time as a clear signal (reset signal) is input to the other input terminal 81b of the counter IC 81, the pulse signal of the pulse oscillation circuit 82 is cleared to zero and turned "off" to the output terminal 81.
An "H" level signal is output to the terminal c. The input terminal 81b for clear signal input
, there is a detection sensor 80 that detects the rotation signal of a circulation motor (not shown) and turns it "on" and "off" at regular intervals, and a pulse-like signal is output by the "on" signal of the sensor 80. One-shot multivibrator IC83 and transistor
The clear signal circuit 84 incorporating T ₁ and T ₂ is connected, and a clear signal is sent to the clear signal input terminal 8 at a predetermined period before the counter IC 81 turns "on".
The detection operation time of the detection sensor 80 is set in advance so as to be input to 1b, so that during normal operation, the counter IC 81 counts a specified number and is cleared to zero before turning on. becomes "off" and outputs "H" to the AND circuit 7 via the transistor _T3 connected to the output terminal 81b.
A level signal is sent. Also,
When the circulation motor (not shown) stops due to mechanical trouble or the like, the detection sensor 80 remains in the "off" state, and no signal is input to the clear signal input terminal 81b, and the counter IC
81 continues counting without being cleared, and when it reaches a specified number, it turns "on" and sends an "L" level signal to the AND circuit 7. In FIG. 4, 71 is a power drive circuit which receives a weak signal from the AND circuit 7 and amplifies it to a signal capable of driving the operating section 3a.

Next, to explain the function and effect, this invention is achieved by simultaneously inputting an "H" level voltage signal to the two input terminals a and b on the input side of the operating section 3a of the drying section. Outputs a "H" level signal to the c side, and connects the two input terminals b
When an "H" level signal is input to one of the terminals and an "L" level signal is input to the other terminal a, an "L" level signal is output to the output terminal c side.
Connect the output terminal c side of AND circuit 7 and
“H” output to output terminal c side of AND circuit 7
The actuating section 3a is driven by a level signal, and the actuating section 3a is driven by an output of an "L" level signal.
The output side of the control circuit 7 is connected to one input terminal b of the AND circuit 7, and the output side of the circulation operation detection circuit 8 is connected to the other input terminal a. Therefore, for example, the circulation operation part (bucket conveyor 21 of grain lifting machine 2)
When the bucket conveyor 21 is operating normally, the circulation operation detection circuit 8 sends an "H" level signal to the AND circuit 7, and when the bucket conveyor 21 stops due to mechanical trouble, the signal is sent to the AND circuit 7. The operation detection circuit 8 detects the “L” level signal.
The signal is now sent to the AND circuit 7, and the operation of the operating section 3a is stopped.

As described above, according to this invention, the “L” level signal detected by the circulation operation detection circuit 8, that is, the detection signal that the circulation operation section has stopped, is transmitted to the hot air supply device 3 by the function of the AND circuit 7. Since it is possible to send a stop signal to stop the operating part 3a of the AND circuit 7, it is possible to prevent uneven drying or fires caused by partial overheating, and also to prevent the occurrence of fires due to uneven drying or partial overheating. The operating section 3a can be controlled by a simple circuit configuration in which the control circuit 6 and the circulating operation detection circuit 8 are connected to the terminal b, and the operating section 3a is connected to the output terminal.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a grain drying device implementing this invention, Fig. 2 is a side view of the same as above, Fig. 3 is a schematic explanatory diagram of a hot air supply device, Fig. 4 is an overall block circuit diagram, FIG. 5 is a circulation operation detection circuit diagram, FIGS. 6 and 7 are sectional views of an automatic moisture detection sensor, and FIG. 8 is a perspective view of a manual moisture detection sensor. Explanation of drawing symbols, A... Grain drying device, 1...
Machine body, 2...Grain frying machine, 3...Hot air supply device (drying action part), 4...Automatic moisture detection sensor, 3a...
Operating part same as above, 5... Manual moisture detection sensor, 6
...Control circuit, 7...AND circuit.

Claims (1)

[Scope of utility model registration request] An automatic moisture detection sensor that samples drying grains and detects the moisture value is connected to a control circuit that compares the detection signal sent from the sensor with the detection signal and sends the result as an activation signal to the output side, and the control circuit In an automatic control device for a grain dryer in which an operating section of a drying section is connected to an output side of the drying section, an "H" level voltage signal is applied to two input terminals of the input side of the operating section of the drying section. When input at the same time, an "H" level signal is output to the output terminal side, an "H" level signal is input to one of the two input terminals, and an "L" level signal is input to the other terminal. By connecting the output terminal side of an AND circuit that outputs an "L" level signal to the output terminal side, the actuating section is driven by the "H" level signal outputted to the output terminal side of the AND circuit. The operating section is controlled to be stopped by outputting an "L" level signal, and the output side of the control circuit is connected to one of the input terminals of the AND circuit,
An automatic control device for a grain drying device, characterized in that the output side of a circulation operation detection circuit is connected to the other input terminal.