JPS5849037Y2 - Grain dryer control device - Google Patents

Description

[Detailed description of the invention] The present invention is a grain dryer control system that simplifies the switch operations for loading, drying, and discharging operations in a grain dryer, and prevents the control circuit from malfunctioning. Regarding equipment.

Conventionally, as a control device for this type of grain dryer,
There is one shown in No.-169405.

When performing drying work, this device automatically performs drying operation by turning on the automatic operation switch after setting a timer.

However, when performing other tensioning and discharging operations, it is necessary to turn on the transport mechanism without turning on the automatic operation switch after setting the timer, and then tensioning and discharging.

If it is desired to rotate the blower to remove dust during the discharge operation, it is necessary to turn on the blower mechanism operation switch.

Having to operate a different switch for each task is troublesome for the worker, and also has drawbacks such as forgetting the correct switch operation procedure and causing erroneous operation. .

In view of the above-mentioned points, the purpose of this invention is to simplify the switch operations for each task by always performing the same operation procedure for each task, such as loading, drying, and discharging. The purpose of this device is to provide a control device for grain dryers, and when changing the selection of each operation, the power to the control circuit must be cut off to prevent the operator from accidentally operating another operation while operating a certain operation. This is intended to prevent the control circuit from malfunctioning even if the work is selectively switched.

To achieve this purpose, the grain dryer control device of the present invention includes an upper storage chamber, a drying chamber having a discharge valve at its lower end, and a grain collecting section for collecting and transferring grains that have fallen from the drying chamber. In a device in which the main body in which the drying chambers are piled up and an elevator are connected, and a burner and an exhaust fan for blowing hot air into the drying chamber are connected, the normally-closed contact of the operation stop switch, and the A series circuit is formed by connecting in series the first contact group of the changeover switch for selecting each work and the second normally closed contact of the operation stop timer, the normally open contact of the operation pushbutton switch, and the relay. a self-holding circuit comprising a normally open contact and a coil of the relay and connected in series to the series circuit; a second contact group of the changeover switch connected in series to the self-holding signal line; and a second contact group of the changeover switch connected in series to the second contact group. According to the present invention, it is composed of a connected electromagnetic contactor for controlling the motor, and a combustion control circuit also connected in series with the second contact group and the first normally closed contact of the operation stop timer. The switch operations for each work such as loading, drying, and discharging are always performed through the same operating procedure as ■setting the operation stop timer, ■setting the changeover switch for work selection operation, and turning on the @operation push button switch. In this way, the switch operation can be simplified and the above-mentioned disadvantages can be avoided.

Further, a self-holding circuit is provided by connecting in series to a series circuit including a group of contacts of a changeover switch for work selection operation, and a control circuit selected for each work is connected in series to a self-holding signal line of the self-holding circuit. Therefore, when changing the selection of the changeover switch for work selection operation, the self-holding of the self-holding circuit is always released and the power to the self-holding signal line is cut off, thereby preventing the malfunction of the control circuit described above. can do.

Embodiments of the present invention will be described below based on the drawings.

The grain dryer DY has a main body D consisting of an upper storage chamber 1 for tempering, a ventilation drying section 2, and a grain collecting section 3 stacked one above the other.
A rotary valve 5 is installed at the lower end of the ventilation drying section 2, and a rotary valve 5 is provided at the lower end of the ventilation drying section 2, and a gutter-shaped A conveying screw 6 is mounted on the bottom of each shaft, and the terminal end of the conveying screw 6 is connected to the supply section of the elevator 4.

Furthermore, a screw conveyor 7 is mounted above the upper storage chamber 1 to carry the grain into the storage chamber 1 in response to grain supply from the elevator 4.

The dryer DY has an elevator motor Ml that drives the elevator 4 and the screw conveyor 7, and a main machine motor M2 that is attached to the main body DY1 and drives the rotary valve 5 and the conveying screw 6.
, an exhaust fan motor M3 that drives an exhaust fan 8 that is connected to the ventilation drying section 2 and that blows hot air generated by the burner 10; A damper drive motor M4 and a damper drive motor M5 for switching the discharge flow path of the elevator 4 are provided.

Next, the control device will be explained.

The power lines ■, ■, ■ are connected to elevator motor Ml, machine motor M2. Each exhaust fan motor M3 has a magnetic contactor contact M
They are connected in parallel via C1, MC2, and MC3, and are connected in parallel only with the elevator motor M1 so that the dust remover motor M4 is controlled simultaneously with the elevator motor M1.

Further, a damper drive motor M5 is connected to the power lines (1) and (2) via the contacts of the relay RY3 and the limit switch LS7, and also to the transformers TI, T2. T3 is each fuse F
1 in parallel.

The damper drive motor M5 uses a torque motor to drive damper switching and at the same time drive the thrower (
In order to generate torque for clutch tension (not shown), when switching to discharge operation, relay RY3 is energized, its normally open contact closes, and damper drive motor M5 rotates forward to drive the damper. Switch to the discharge side, stop at that position, and hold with constant torque.

When the machine is stopped after discharge work is completed, or when it is switched to other tensioning or circulation work, relay R is activated.
Y3 is turned off, its normally closed contact is closed, the damper drive motor M5 is reversely rotated, the damper is switched to the circulation side, and the end of the switching is detected by the limit switch LS7, and the motor M5 is stopped.

Lines P and N are connected to the output side of the transformer T1 via a rectifier circuit RF.

Between these lines P and N, there is a normally closed contact of a push button switch FBI which is an operation stop switch, and a (a) for work selection operation.
The 10th SS of the rotary switch has each contact group of (filling), b (drying), C (discharge), and d (circulating ventilation).
1-1. The second normally closed contact TM2 of the operation stop timer, the normally closed contact RY1 of the overload detection relay. A series circuit formed by connecting in series the normally closed contact LSI of the paddy clogging detection limit switch at the bottom of the elevator and the normally closed contact LS2 of the fire extinguisher operation detection limit switch, and the indoor contact PB of the operation pushbutton switch.
2-1. A normally open contact RY2 for self-holding of the relay connected in parallel to the normally open contact PB2-1, and a coil RY2 of the relay.
and a self-holding circuit connected in series to the series circuit.

Further, a work selection self-hold release circuit A (FIG. 3) is connected between line N and relay RY2.

This self-holding release circuit A is provided to ensure that the self-holding circuit releases its self-holding when the tenth terminal 5SI-1 of the rotary switch switches at the same time. This circuit is unnecessary when using a changeover switch other than the above and which is not capable of instantaneous switching.

On the other hand, the constant voltage power supply circuit B ( The output voltage B' of Fig. 4) is
The voltage is determined to be lower than the DC voltage applied to the line P and is supplied to the self-hold release circuit A.

The diode D1. Relay RYI, which uses the midpoint of D2 as one feeding point, and diode D3, which is provided in parallel with it, are driven by an overload detection circuit C (FIG. 5) connected to the other.

Furthermore, the first operation pushbutton switch of the self-holding circuit
The 20th switch 5SI-2 of the rotary switch for work selection operation is connected in series to the self-holding signal line CP, which connects the intermediate point between the regular contact PB2-1 and the relay RY2. (inclusive), b' (dry), C' (
exhaust), d' (circulating ventilation), and the 10th-ta 5S
Switches in conjunction with I-1.

The contact a' is connected via the diode D4 to the electromagnetic contactor MC3 that controls the operation of the exhaust fan motor M3, and is also directly connected to the full charge detection limit switch LS4, the diode D5, the line El, and the buzzer BZ. Line N
Connect to.

Further, contact b' is supplied with power to the machine motor operation control circuit DRI via diode D6 and contact W' (automatic operation) of the 20th motor 5S2-2 of the rotary switch for operation selection operation. is connected to the motor operation control circuit DR1 (FIG. 6) as an input for intermittent operation control via a limit switch LS5 for stopping the operation of the diodes D6. The electromagnetic contactor MC3 via D7
The burner combustion control circuit FC is connected directly to the burner combustion control circuit FC via the first normally closed contact TMI of the shutdown timer.
connected to.

Further, the contact C' is connected to the electromagnetic contactor MC3 via the diode D8, and at the same time is connected to the relay RY3 that controls the operation of the damper drive motor M5, and furthermore, the contact C' is connected to the 30th - of the rotary switch for operation selection operation. Ta5S
The machine motor M2 is connected to the machine motor M2 via the contact W'' (automatic operation) of 2-3 and the limit switch LS8 that detects the full amount or overflow on the discharge side when discharging grain from the dryer.
It is connected to the electromagnetic contactor MC2 which controls the operation.

Furthermore, the contact d' is connected to the electromagnetic contactor MC3 similarly to the contact b'.
, is connected to the motor operation control circuit DR1 of the present machine, but conduction to the combustion control circuit FC is blocked by a diode D6.

On the other hand, the 10th rotary switch for driving selection operation
The terminal 5S2-1 is provided in parallel with the 20th terminal 5SI-2 of the rotary switch for operation selection operation, and has a contact W.
(automatic operation), X (continuous operation), Y (intermittent operation), Z (
At the same time, the contacts W' (automatic operation), X' (continuous operation), Y' (intermittent operation), and Z' in the 20th-terminal 5S2-2 are connected alternatively to the rotary valve stop).
(Stop) and contact point W'm at No. 30-tater 5S2-3
(dynamic operation), X” (continuous operation), Y” (intermittent operation).

Each is linked with Z'' (stop).

The contact W is connected to the electromagnetic contactor MCI which controls the operation of the motor M1 of the elevator 4, and the contacts X and Y are connected to the electromagnetic contactor MCI via the diode D9 and to the light emitting display element LED 1 via the diode D10. The contact Z is connected to the light emitting display element LED1.

Also, the contacts X' and Z' in the 20th terminal 5S2-2
and contacts Y″ and Z″ in the 30th terminal 5S2-3.
is kept neutral, and the contact Y' of the 20th terminal and the contact X'' of the 30th terminal are respectively connected in parallel with the 10th terminal 5S2-1.

Furthermore, the above-described full tension detection limit switch LS4
In parallel with the fuel tank full detection float switch FLTS
are connected to the line E1 via a diode D11, and light emitting display elements LED2. Diode D
12 to line E2.

Further, the burner combustion control circuit FC described above includes the 20th switch 5SI-2 of the rotary switch for operation selection operation.
The first contact TMI of the timer is connected to contact b'.

an ignition control circuit DR2 (a thermostat for detecting excessive temperature rise) TH8I, and an ignition control circuit DR2 (
(Fig. 7), a misfire detection circuit FM including a misfire detection thermostat (TH82), and a normally open contact R of a relay between the output lines U and V of the transformer T2 connected to the power supplies ① and ②.
A solenoid valve Sv connected via Y6-2 and this solenoid valve S
The normally open contact RY5 of the relay and the fuse F are connected in parallel with the V circuit.
Electromagnetic pump drive control circuit TCP (
(including an electromagnetic pump SP).

A contact of a self-holding relay RY5 is arranged in parallel with the second contact PB2-2 of the operation pushbutton switch.

Normally open contact RY of the relay connected to the ignition control circuit DR2
6-1 connects its contact in series with the heater H connected to the second output line of the transformer T2.

The misfire detection circuit FM is a thermostat for misfire detection) TH.
The collector of a transistor Q1 whose base is connected to the midpoint between voltage dividing resistors R2 and R3 connected in parallel with 82 is connected to the timer first contact TM via resistors R4 and R5.
A transistor Q2 is connected in series with the line E1, and its base is connected to the connection point of the resistors R4 and R5.The collector of the transistor Q2 is connected to the line E1 via the diode D13, and the emitter of the transistor Q1 is connected to line N.

In addition, diode D1 is connected in parallel with thermostat TH82.
Four light emitting display elements LED3 are connected in series.

Note that TM is connected to the line U via relay contact RY2.
, shows the motor of the shutdown timer connected between V and V.

In addition, FIG. 3 is an example of the work selection self-hold release circuit A, FIG. 4 is an example of the constant voltage power supply circuit B, FIG. 5 is an example of the overload open phase detection circuit C, and the machine's motor operation control circuit DR1. 6, which is illustrated as an example, and FIG. 7, which is illustrated as an example of the ignition control circuit DR2, explanations will be omitted.

Next, the operation of the above control device will be explained.

Grain dryer operations include: ■ Loading the material to be processed into the machine, ■ Drying by circulating the material and blowing heated hot air through it, and ■ Transferring the material to the outside of the machine after drying. In special cases, there are two types: (1) circulating ventilation in which the material to be treated is circulated and ventilated at room temperature without being heated;

Now, in the case of ■, when the timer is set, the contact TM
I and TM2 are closed, and relay RYI is energized by overload detection circuit C to close its contacts.

(Operation continues if there is no problem.) Next, turn the knob of the rotary switch for work selection operation to set it to staking. The second group of contacts a and a' are connected, and pressing the run pushbutton closes its normally open contact PB2-1.

As a result, the relay RY2 closes its normally open contact RY2 to self-hold, and as a result of energizing the self-holding signal line CP, the electromagnetic contactor MC3 closes and the exhaust fan motor M3 is activated.

On the other hand, the rotary switch SS2 for driving selection operation is
This selects the rotation of the rotary valve 5 and the operation of the conveyance screw 6 of the dryer, and it is stopped during loading, continuous and intermittent during circulation (including drying), and continuous and intermittent during discharge. In the case of an automatic system, this stop can be automatically switched between 5 consecutive intermittences, and in this case, it is a stakeout, so of course it cannot be stopped.

First, if the knob is connected to the automatic or W contact,
The electromagnetic contactor MC1 closes and the elevator motor M1 and the dust remover motor M4 start.

At this time, the switching damper of the elevator 4 is naturally set to the circulation side, that is, the direction in which the grain to be processed from the elevator 4 flows into the dryer main body DYI.

Then, it may be charged from a hopper (not shown). When the grain reaches the full amount, the full amount detection switch LS4 closes its contact and sounds the buzzer BZ, so the stop push button switch F is activated.
Press BI to stop.

If the fuel level in the fuel tank is not sufficient when the operation pushbutton switch PB2-1 closes earlier than that, the fuel tank full detection float switch FLTS sounds the buzzer BZ via its closed contact. At the same time, the light emitting display element LED 2 lights up, so that fuel is replenished and no fuel shortage occurs during the drying process.

In addition, when the rotary switch for operation selection operation is connected to X (continuous) other than automatic (contact Z), it is connected to contact X// via the 30th terminal, and Y (intermittent)
When connected to the rotary valve 5, it is connected to the motor operation control circuit DRI of this machine via the 20th terminal, and the rotary valve 5
The inconvenience that the elevator motor M1 is activated is displayed on the light emitting display element LED 1 as an operation error, and furthermore, when it is connected to Z (stop), the inconvenience that the elevator motor M1 is not started is similarly displayed.

Therefore, all you have to do is reconnect the knob to the W contact (automatic).

(Of course, there are times when the operation is carried out in this way due to work necessity.) In the case of (0), set the timer and turn the knob of the rotary switch for operation selection operation to the dry position. Connecting.

When the operation starts, the elevator motor Ml and the dust extractor motor M4
．． At the same time as the exhaust fan motor M3 and main unit motor M2 are started, the combustion control circuit FC is also energized, and the electromagnetic pump SP is started.

Fuel is supplied from the fuel tank to the burner by the solenoid valve SV, and the ignition heater H is energized.

At this time, the ignition control circuit FC is operated on a timer and operates the solenoid valve S■ and the heater H only for a predetermined time.

The burner is ignited within this predetermined time, and the thermostat TH82 is closed within a predetermined time set by a timer (not shown) of the electromagnetic pump drive control circuit TCP to continue driving the electromagnetic pump SP.

However, if the thermostat (TH32) is still open after a predetermined period of time, the base voltage of the transistors Ql and Q2 rises, sounds the buzzer BZ, lights up the light emitting display element LED3, and causes a misfire (due to ignition error and fuel shortage). Furthermore, the TCP detects the opening of the thermostat TH82 and simultaneously stops driving the pump SP.

Furthermore, when the knob of the rotary switch for operation selection operation is connected to the X contact (continuous) other than the W contact X'', and the rotary valve 5 is continuously driven.

When connected to the Y contact, the machine motor M2 is connected to the contact Y' via the limit switch LS5 and the machine motor operation control circuit DRI, and the rotary valve 5 is intermittently driven.

When connected to the Z contact, the machine motor M2 and elevator motor M1 remain stopped, that is, only ventilation is performed without circulation.

Further, the light emitting display element LED 1 lights up when a mode other than automatic is selected.

At the end of drying, the first contact TMI of the operation stop timer TM is opened, only the combustion control circuit FC is stopped, and the supply of fuel to the burner is stopped. Then, after a predetermined time, the second contact TM2 of the timer is opened, and each All motors stop.

In the case of ■, if the rotary switch for work selection operation is connected to the C contact (discharge), the elevator motor M
l, exhaust fan motor M3. Dust extractor motor M4゜This machine motor M2 is driven.

At the same time, relay RY3 is energized and tapper drive motor M5 is
The normally open contact leading to is closed, and motor M5 rotates the damper to the discharge side.

In this case, the damper does not need to be switched at the same time as the discharge starts, and the damper is slowly switched to the starter.

Even if the switch is switched, the motor remains energized and stops, generating a constant torque, which is used for clutch tension in another drive system (for example, a thrower).

In this case as well, manual switching is possible by switching the rotary switch for operation selection operation, and continuous operation of motor M2 of this machine
Intermittent operation can be selected.

In case of ■, if you connect the knob of the rotary switch for work selection operation to the d contact (circulating ventilation), the b contact (drying)
Compared to the case where the combustion control circuit FC is not operated, everything else operates in the same way.

Next, the operation of the present invention will be explained.

As mentioned above, when carrying out each work of tensioning, drying, and discharging, the operator only needs to perform the following operating procedures ①, ①, and @.

Operation procedure ■Set the operation stop timer, ■Set the rotary switch knob for work selection operation, and press the @operation push button switch.

Therefore, according to the control device of this invention, the operation can be simplified.

In addition, since the self-holding circuit including relay RY2 is connected in series to the series circuit including the 10th switch 5S1-1 of the rotary switch for work selection operation, the self-holding circuit is always connected to the self-holding circuit when the rotary switch is changed. Release.

Therefore, the power to the self-holding signal line of the self-holding circuit is also cut off, so that the 20th-terminal 5SI-2 of the rotary switch connected to the self-holding signal line, the electromagnetic contactor for motor control, the combustion control circuit, etc. are controlled. The circuit ceases its operation.

Therefore, even if the operator accidentally selects and switches the changeover switch for operation selection operation to another operation while operating a certain operation, the control circuit can be prevented from malfunctioning.

Note that instead of the rotary switch, a changeover switch that can select and change multiple contacts may also be used.

In short, the present invention connects an elevator to a main body in which an upper storage chamber, a drying chamber having a discharge valve at its lower end, and a grain collecting section that collects and transfers grains that have fallen from the drying chamber are stacked, and In the drying room, in which a burner and an exhaust fan are installed in series to ventilate hot air, a normally closed contact of the operation stop switch and a changeover switch for operation selection operation to select and switch each operation of loading, drying, and discharging. A series circuit consisting of the first contact group and the second normally closed contact of the operation stop timer connected in series, the normally open contact of the operation pushbutton switch, the normally open contact of the relay, and the coil of the relay, and a self-holding circuit connected in series to the circuit, a second contact group of the changeover switch connected in series to the self-holding signal line of the self-holding circuit, and a motor control electromagnetic contactor connected in series to the second contact group; Since a combustion control circuit is also provided which is connected in series with the second contact group and the first normally closed contact of the operation stop timer, the switch operation for each work of filling, drying, and discharging can be controlled by the operation stop timer. ■ Setting the changeover switch for work selection operation, ■ Turning on the operation push button switch are always performed through the same operating procedure, which simplifies the operation and eliminates the causes of erroneous operation. It can be reduced.

In addition, when the changeover switch for work selection is changed, the self-holding circuit always releases its self-holding, cuts off the power to the self-holding signal line, and stops the operation of the control circuit. It is possible to prevent the control circuit from malfunctioning due to the operator accidentally switching the changeover switch for work selection operation to another work while driving the machine.

[Brief explanation of the drawing]

Figure 1 is a side view of a grain dryer implementing this invention.
Figure 3 is an operating circuit diagram showing an embodiment of this invention; Figure 3 is a circuit diagram as an example of the work selection self-hold release circuit A;
The figure shows a circuit diagram as an example of constant voltage power supply circuit B, FIG. 5 shows a circuit diagram as an example of overload detection circuit C, FIG. 6 shows a circuit diagram as an example of motor operation control circuit DR1, and The figure is a circuit diagram showing an example of the ignition control circuit FC.

Claims (1)

[Scope of utility model registration request] An elevator is connected to a main body in which an upper storage chamber, a drying chamber having a discharge valve at its lower end, and a grain collecting section for collecting and transporting grains that have fallen from the drying chamber are stacked, and hot air is supplied to the drying chamber. A normally closed contact of an operation stop switch, a first contact group of a changeover switch for selection and switching of work selection operations for filling, drying, and discharge work in a device in which a burner and an exhaust fan for ventilation are connected. A series circuit formed by connecting the second normally closed contact of the operation stop timer in series, a horizontal contact of the operation pushbutton switch, a normally closed contact of the relay, and a coil of the relay, and connected in series to the series circuit. a holding circuit, a second contact group of the changeover switch connected in series to the self-holding signal line of the self-holding circuit, a motor control electromagnetic contactor connected in series to the second contact group, and also the second contact group. and a combustion control circuit connected in series to the first normally closed contact of the operation stop timer.