JPS5934874Y2 - Grain ventilation drying equipment - Google Patents

Description

[Detailed description of the invention] This invention consists of a grain tank formed so that drying air passes through all or part of the grains placed in the grain tank, and a hot air that becomes the drying air. This relates to an improvement of a grain ventilation drying device that is combined with a burner device for drying, so that a large amount of fuel can be burned only at the beginning of the drying process to control the operation of the burner device in a rich state. For this purpose, it is possible to control the grain temperature in a grain vat filled with grains to a substantially constant temperature.

To specifically explain the embodiment based on the drawings, the first
In Figure VC, 1 is the body of the grain ventilation dryer A, 2 is a grain tank installed in the inner cavity of the machine body 1, and 3 is a feeder for the grain loaded in the grain tank 2. An air guide path consisting of an air-permeable partition wall such as a net body arranged in the central part of the inner cavity of the grain tank 2 so as to cross the front and back (in the left-right direction in the drawing) to guide drying air (hot air);
5 is a burner device that generates the hot air, and 5 is the burner device that generates the hot air.
A burner blower that sends hot air generated in the device 4 to the air guide path 3rlc and also supplies combustion air to the burner device 4; 6 is a hot air that is generated in the burner device 4 and sent into the air guide path 3; As shown by the arrow in Fig. 2, a suction fan is used to suck the grain through the grain layer, and its suction port is formed below the bottom plate 2a of the grain tank 2, which is made of an air-permeable partition wall. It is connected continuously to the vacant room γ.

The burner device 4 includes a pump P for feeding fuel.
The above-mentioned blower 5 is operated by a motor M to send out combustion air, and the pump P that feeds the fuel is operated by applying an intermittent current to an electromagnet or a solenoid to operate a plunger and perform a pumping action. An electromagnetic pump is used.

D is a pilot generator that generates a sine wave signal with a frequency proportional to the rotation speed of the motor M of the blower 5.

The sine wave signal is input to a Schmitt trigger circuit E composed of transistors t and tIK, and a current that turns on and off at the same frequency as the sine wave signal flows through the Schmitt trigger circuit E.

Therefore, the output voltage of the Schmitt trigger circuit E becomes the same square wave as the sine wave signal.

This square wave signal is applied to the transistor t3 and the diode T.

Switch circuit F composed of capacitor CFIC
A current flows through the switch circuit FK: which is turned on and off at the same frequency as the square wave signal, so that the energization of the electromagnetic pump P is turned on and off at the same frequency as described above.

That is, the frequency at which the electromagnetic pump P is turned on and off is proportional to the rotation speed of the motor M, and if the rotation speed of the motor M is high, the frequency at which the electromagnetic pump P is turned on and off is proportional to the rotation speed of the motor M. The amount of material discharged also increases.

Conversely, if the rotational speed of the motor M is low, the frequency for turning on and off the electromagnetic pump P will be low, and the amount of output of the electromagnetic pump PO will be reduced.

In addition. The power source for the electromagnetic pump P, motor M, etc. is a DC power source obtained by rectifying the commercial power source B with a diode T1 and smoothing it with a capacitor C1.

G-H is a hot air control circuit and a grain temperature control circuit for controlling the rotation speed of the motor M, which are respectively connected in parallel to the motor circuit m of the motor JM.

The hot air control circuit G includes a variable resistance circuit r whose electric resistance value is set to a desired value by a manual variable resistor R, and a hot air whose electric resistance value increases by detecting the temperature inside the air guide path 3 with a hot air sensor 8. At the beginning of the drying process, the temperature inside the air guide path 3 is set to 8, for example, by the variable resistor R.
A large potential difference occurs between the variable resistance circuit r whose resistance value is set to 0 degrees and the hot air sensor circuit S that detects it, and as a result, the current reaches the maximum in the motor circuit m via the transistors t3, t4, and t5. When the air starts to flow and the temperature in the air guide path 3 approaches the set temperature after the initial drying, the hot air sensor 8 detects this and the potential difference between the hot air sensor circuit S and the variable resistance circuit r becomes smaller. It is set so that the current flowing through the motor circuit m is small.

The grain temperature control circuit H includes a variable resistance circuit r1 whose electric resistance value is set to a desired value by a manual variable resistance R□, and a grain tank 2.
The grain temperature sensor circuit S□ increases the electric resistance value by detecting the grain temperature of the grains stuck inside with the grain temperature sensor 9.
In the initial drying, a large potential difference occurs between the variable resistance circuit r□ whose resistance value is set so that the grain temperature in the grain tank 2 becomes, for example, 40 degrees by the variable resistor r□ and the grain temperature sensor circuit S□ that detects it. When the initial drying in the enclosure is completed, the grain temperature in the grain tank 2 approaches a predetermined temperature, and the grain temperature sensor 9 detects this, so that a small potential difference is generated between the grain temperature sensor circuit S□ and the variable resistance circuit r1. The control of the current flow is the same as the hot air control circuit G, and the terminal side of the transistor t6 connected to the grain temperature control circuit HK is connected to the terminal side of the transistor t5 incorporated in the motor circuit m side. It is connected to the base.

The transistors t3, t4, t5, and t6 are connected to the hot air control circuit G and the grain temperature control circuit H because the temperature in the air guide path 3 reaches the set temperature earlier than the grain temperature during the initial climbing. Even if a time difference occurs in each sensor circuit S-8□ and the current from the hot air control circuit G side becomes small, the grain temperature control circuit H
The flow of current to the motor circuit m is controlled by the current from the side until the grain temperature reaches the set temperature, and when the internal temperature of the air guide path 3 and the grain temperature reach the set temperature.

The current is controlled to flow to the motor circuit m with priority given to the current with a higher potential difference between each circuit G-H, and the grain temperature and the temperature inside the air guide path 3 are controlled by the grain temperature sensor 9 and the hot air sensor 8. is connected so as to detect and thereby control the current flowing to the motor circuit m.

Reference numerals 80 and 90 denote a sensor section of the hot air sensor 8 and a sensor section of the grain temperature sensor 9. The sensor section 80 of the hot air sensor 8 is arranged so as to face the vicinity of the burner device 4. Reference numeral 90 projects into the front grain tank 2 on the side of the burner device 4 so as to detect the grain temperature of the grains loaded into the grain tank 2.

In addition, 10 is an elevator, 11 is an equalizer, 12 is a drum jammer, and 13 is a discharge conveyor.

When drying grains by placing them in the grain tank 2 of the grain ventilation dryer A configured in this way, for example, the resistance value of the variable resistor R of the hot air control circuit G is set to the combustion air supplied by the blower 5. The resistance value is set so that the temperature of the hot air generated by the burner device 4 and sent out by the air and the fuel supplied by the electromagnetic pump P rises to a safe temperature of approximately 80 degrees, and the hot air sensor installed in the housing is set. 8 is set so that the potential difference between the hot air sensor circuit S and the variable resistance circuit r disappears by detecting that the temperature in the guideway 3 reaches around 80 degrees,
By setting the resistance value of the variable resistor R1 of the grain temperature control circuit H to raise the grain temperature to about 40 degrees, and using the grain temperature sensor 9 to detect when the grain temperature has reached around 40 degrees. If drying is performed with the grain temperature sensor circuit r1 set so that there is no potential difference between the variable resistance circuit S 4 burns a large amount of fuel to operate in a strong state, and when the grain temperature reaches the set temperature, burns a small amount of fuel to operate in a weak state.Hereinafter, the hot air sensor 8 and grain temperature sensor of each circuit G4 9 controls the temperature in the air guide path 3 and the grain temperature in the grain tank 2 so that the burner device 4 does not operate so as to exceed the set temperature.

In particular, in the initial drying of raw paddy with a moisture content of about 25 to 26, if only the hot air sensor 8 is used, the temperature in the air guide path 3 will rise before the desired grain temperature is reached. When the set temperature is reached, the operation of the burner device 4 becomes weak, and if only the casing and grain temperature sensor 9 are used, there will be a difference in grain temperature between a place close to the air guide path 3 and a place far away. from,
Temperature detection tends to be inaccurate, and sometimes the temperature inside the air guide path 3 rises too much, causing deterioration of grains near the air guide path 3. According to the blower motor circuit.

Hot air temperature control that controls the current flowing through the motor circuit based on the potential difference between a variable resistance circuit whose electric resistance value is set to a desired value using a manual variable resistance and a hot air sensor circuit which detects the temperature inside the air guide path using a hot air sensor. The motor circuit is controlled by the potential difference between the circuit, a variable resistance circuit whose electric resistance value is set to a desired value by a manual variable resistance, and a grain temperature sensor circuit which detects the grain temperature of grains placed in the grain vat with a grain temperature sensor. A grain temperature control circuit that controls the current flowing through the grain tank is connected in parallel, the hot air sensor is arranged near the burner device Q, and the grain temperature sensor detects the grain temperature of grains placed in the grain vat. During initial drying,
When the grain temperature in the grain tank reaches the desired set temperature, the burner device operates vigorously, and when the grain temperature reaches the grain temperature set temperature, the burner device operates weakly. The burner device can be controlled so as to maintain the grain temperature at a substantially constant level without raising the temperature in the air guide path too much.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway side view of a grain ventilation drying device implementing this invention, FIG. 2 is a front view of the same, FIG. 3 is a block diagram, and FIG. 4 is an electric circuit diagram. Explanation of drawing symbols, A... Grain-grain ventilation dryer, 1...
... Airframe, 2 ... Grain tank, 3 ... Air guide path, 4 ... Burner device, 5 ... Air blower, 6 ... ...Suction fan, 8...Hot air sensor, 9...Grain temperature sensor, 80...Sensor part of hot air sensor, 90...Sensor of grain temperature sensor Part, M...Motor, D...Pilot generator, E...Schmitt trigger circuit, F...
...Switch circuit, G...Hot air control circuit,
H...-Grain temperature control circuit m...Motor circuit, R
-R□・・・Variable resistance, S・・・Hot air sensor circuit, r・・・Variable resistance circuit, S□・・・・・・
・Grain temperature sensor circuit, B...Power supply.

Claims (1)

[Scope of utility model registration request] In a burner device that sends hot air into an air guide path of a grain tank using an electromagnetic pump that feeds fuel and a blower that feeds combustion air, the electromagnetic pump is connected to be driven in proportion to the rotation of a motor of the blower. The blower motor circuit has
Hot air temperature control that controls the current flowing through the motor circuit based on the potential difference between a variable resistance circuit whose electric resistance value is set to a desired value using a manual variable resistance and a hot air sensor circuit which detects the temperature inside the air guide path using a hot air sensor. The motor circuit is controlled by the potential difference between the circuit, a variable resistance circuit whose electric resistance value is set to a desired value by a manual variable resistance, and a grain temperature sensor circuit which detects the grain temperature of grains placed in the grain vat with a grain temperature sensor. A grain temperature control circuit that controls the current flowing through the grain tank is connected in parallel with the grain temperature control circuit, the hot air sensor is arranged in the vicinity of the burner device, and the grain temperature sensor detects the grain temperature of grains placed in the grain vat. A grain ventilation drying device characterized in that the grain ventilation drying device is arranged at an appropriate position in a grain tank.