JPS5929795B2 - automatic drying device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic drying device installed in a rice center or the like.

At the rice center, paddy is harvested and threshed with a combine harvester, collected from various locations, dried in an integrated process, and then hulled to become rice and shipped.

That is, the collected paddy with high moisture content is supplied from the receiving hopper to a rough sorter, where it is roughly sorted to remove impurities, and then loaded into a storage tank by a loading elevator.

The paddy is pre-dried in this storage tank for a certain period of time in a state close to natural drying, and the paddy with a high moisture content is
It drops to 8 dominance.

The paddy that has been pre-dried in this way is conveyed. The material is conveyed by an elevator to a down-flow dryer, where it is dried with hot air, and the moisture content is reduced to, for example, 15 degrees.

After the dried paddy is tempered in a finishing tank,
The paddy is supplied to a huller, where it is hulled, and after the paddy is sorted into two grains, it is shipped as a product.

However, in conventional automatic drying equipment, the moisture value of the grains loaded into the dryer is determined by taking a sample from the grain stored in the storage tank and measuring the moisture content. Therefore, it was rare to obtain a constant average value.

For this reason, in dryers, the hot air temperature is increased,
Since this unstable value is dealt with by extending the drying operation time, there is a drawback that the control operation becomes extremely troublesome.

The present invention was made in order to eliminate these conventional drawbacks, and its purpose is to ensure that grains with a constant moisture level are always loaded into the dryer, thereby saving labor and eliminating the need for troublesome operations. The purpose of the present invention is to provide an automatic drying device that can be used in a variety of ways.

In order to achieve such an object, the present invention measures the moisture value of grains by a moisture measuring means provided on a grain conveyance path, operates a conveyance direction switching means based on the measured value,
If the moisture value is greater than the set value, return the grain to the storage tank;
If it is small, it is configured so that it can be fed to a dryer.

Hereinafter, the present invention will be explained in detail with reference to Examples.

FIG. 1 is a block diagram of an embodiment of an automatic drying apparatus according to the present invention.

The collected high-moisture grain paddy is roughly sorted and then sent to the bundling conveyor 1 by the pitching elevator.

The tensioning conveyor 1 is installed above and across the storage tanks 2 arranged in plurality, and the paddy transported by the tensioning conveyor 1 falls evenly from the belt and is sequentially transferred to each storage tank 2. It will be stored.

A large volume of room temperature or slightly heated air is blown into the storage tank 2, and the stored paddy is gently pre-dried to a state similar to natural drying.

The pre-dried paddy is sequentially discharged onto a discharge conveyor 3 disposed across the lower side of the storage tank 2, and after being conveyed along the way, it is conveyed upward to a position above the loading conveyor 1 by a rotation elevator 4. be done.

The rice grains transported upward in this manner are supplied through the chute pipe to a temperature moisture measuring device 5 and a transport direction switching device 6.

When the paddy passes through a moisture measuring device 5, the moisture content of the sample is measured, and depending on the measured value, the conveyance direction switching device 6 directs the conveyance path to either the lining conveyor 1 or the next stage relay tank 1. It can be switched to

The paddy returned to the loading conveyor 1 is again pre-dried in the storage tank 2, and thereafter circulates along the same conveyance route.

On the other hand, the paddy supplied to the relay tank I is transported from there to the dryer 9 by the dryer loading elevator 8.

The dryer 9 is of a flowing drying type, and the fully loaded rice is sequentially flowed down and circulated, and is dried by blowing hot air on the way down.

The amount of paddy loaded in the dryer 9 is detected by a level sensor or the like provided on the upper inner wall.

Note that when the dryer 9 is filled with paddy, there will be a surplus that cannot be filled, and the relay tank 1 serves as a damper to accommodate this surplus.

On the other hand, the data of the moisture value measured by the moisture meter 5 is converted into a digital quantity by the width converter 10 and inputted to the control circuit section 1.

The control circuit section 11 also includes a dryer 9 and a relay tank I.
The signal that is output when the is full is input.

These A/1) converters 10. The control circuit section 11 is built into a control panel 12, and according to commands from this control panel 12,
Staking conveyor 1. Discharge conveyor 3. Rotating elevator 4. The dryer loading elevator 8 performs a conveying operation,
The dryer 9 carries out a downward movement of paddy, and the conveyance direction switching device 6 carries out a switching operation.

The paddy dried to a predetermined moisture content in the dryer 9 is tempered in a finishing tank (not shown), then passes through a huller, a paddy sorter, a two-grain sorter, etc., and becomes product wood, which is then shipped. I'm going to go.

FIG. 2 is a vertical cross-sectional view of the moisture measuring device 5 and the conveyance direction switching device 6. FIG. 3 is a cross-sectional view taken along the line -■ in FIG.

In the figure, reference numeral 51 denotes a square cylindrical measuring tank having an inlet part 51a and an outlet part 51b, and a saucer 5 is located below the inlet part 51a.
A plurality of (four, however, two are shown in the figure) measurement paths 53 are provided extending from this saucer 52 along the side surface of the measurement tank 51.

A moisture meter 8 is attached to the outside of each measurement path 53.

Reference numeral 55 denotes an electrode provided protruding from the moisture meter 54 into the measurement path 53, and 56 is an electrode provided on the inner surface of the measurement path 53 opposite to this electrode 55.

The paddy supplied to the inlet portion 51a through the pipe chute falls onto the receiving tray 52, and a portion thereof enters the measurement path 53.

Since the outlet of the measurement path 53 is narrow, the rice that has entered the channel slowly flows down, and when the moisture meter 54 starts measuring operation in response to the measurement signal, a voltage is applied between the electrodes 55 and 56. The moisture content of the paddy is measured.

When a large amount of rice is supplied and the tray 52 is full, any more rice overflows and passes through the measurement path 53; it bypasses and flows directly down to the outlet portion 51b.

On the other hand, 61 is a conical switching tank having an inlet 61a at the center of the upper surface, and three outlet ports 62a at the lower end for each 120°C.
, 62b, 62c is fixed.

The inlet portion 61a is connected to the outlet portion 51b of the moisture measuring device 5.

A cylindrical direction switching path 63 extending along the inclined side surface is provided in the switching tank 61, and the direction switching path 63 has an upper end 63a rotatably supported concentrically with the inlet 61a, and a lower end 63a. The center of the bottom plate 63c extending inward of the portion 63b is fixed to the cam support 64.

The upper end 63b is connected to the discharge ports 62a and 62 of the board 62.
It is arranged at the bt62c position.

Further, the cam support 64 is rotatably supported concentrically on the base plate 62 by a bearing 65, and is rotated via the gear 61 by an output shaft 66a of a motor 66 attached to the base plate 62.

68a, 68b, and 68c are limit switches attached to the board 62 at intervals of 120°C, and the actuator 6
The tips of 9a, 69b, and 69c are engaged with the outer circumferential surface of the cam support 64.

Each limit switch operates when the tip of its actuator enters the recess 64a of the cam post 64.

The figure shows a state in which the limit switch 58a is activated and the lower end 63b of the direction switching path 630 is opposed to the discharge port 62a.

Although not shown, the discharge port 62a is connected to the tensioning conveyor 1 via a pipe chute, and the discharge port 62b is connected to the relay tank γ via a pipe chute.

Note that the outlet 62c is not used in this embodiment.

By rotating the direction switching path 63 on the substrate 62 by the rotation of the motor 66, the paddy flowing from the moisture measuring device 5 through the inlet portion 61a can be switched to the path of each discharge port.

FIG. 4 is a circuit diagram of the control circuit of the conveyance direction switching device 6.

In the figure, 14 is a changeover switch used when switching between automatic and manual mode, 15 is a changeover switch for changing each circuit of the limit switch, and 16 is a changeover switch used when the motor 66 stops rotating. This is an electromagnetic brake circuit for applying a brake to the rotation of the motor 66 so that it does not pass the position of the discharge port due to inertia.

When the selector switch 14 is set to manual, the C contact turns on, the B contact turns off, and relay X operates.

are all turned on and automatic circuits are turned off.

When the changeover switch 14 is set to automatic, the C contact is turned off, the B contact is turned off, and the relay contact Xo is turned on, so that the automatic circuit works.

Here, if the moisture content of the passing paddy is measured by the moisture meter 5 and the moisture content is, for example, 18% or more,
A signal flows from the control circuit 11 to the relay R1 and the relay contact r
1 turns on.

Then, when the moisture content becomes, for example, 18% or less, the relay R
1 signal is cut off and a signal flows to relay R2, relay contact r
2 turns on.

Relay R3 and relay contact r3 are not used in this embodiment.

In addition, the changeover switch 15 has its C contact and B contact turned on,
C contact is turned off.

Then, the limit switch 68a is in the operating state and the NC
To the force that turns on the contact limit switch 68b, 6
Since the actuator 8c is pressed and is in a non-operating state, the NO contact is on.

Therefore, when the moisture content measured by the moisture measuring device 5 is 18 or more, the relay R1 is activated and the relay contact r1 is turned on, so the pilot lamp PL lights up to indicate the conveyance path that is being switched. and at the same time relay
operates, relay contact X1 is turned on, and light emitting diode L1 installed on control panel 12 emits light to similarly indicate the transport path.

In this state, the paddy is supplied to the bundling conveyor 1, and further stuffed into the storage tank 2, where it is pre-dried again.

If sufficient pre-drying has been done and the moisture content measured by the moisture meter 5 has fallen to below 18, relay R2 is activated.
operates and relay contact r2 turns on, so relay R is activated via the NO contact of limit switch 68b.

Current flows through the relay R6, which operates and connects the relay contact r01.
is on.

2 is off. At this time, the pilot lamp RL is turned off by turning off the relay contact r1.

The light emitting diode L1 goes out together.

At the same time, the contact of the limit switch 68a changes from NC to NO.
Switch to .

Relay contact r. 10, the motor 66 rotates, and the tip of the actuator 69b touches the four parts 64a of the cam support 64.
When the limit switch 68b is activated, the NO contact turns off and the NC contact turns on, so that the relay contact r
.

1 is turned off and the motor 66 suddenly stops.

As a result, the lower end 63b of the direction switching path 63 is connected to the discharge port 62.
The conveyance path is switched opposite to b.

When the NC contact of the limit switch 68b is turned on, the pilot lamp PL2 lights up to display the switched conveyance path, and at the same time, the relay X2 is activated, the relay contact X2 is turned on, and the light emitting diode L2 emits the same light. Display the switched transport path.

In this state, the paddy is supplied to the relay tank I, and then placed in the dryer 9 where it is dried with hot air.

In addition, pilot lamp PL3. Relay X3. Relay contact X31 and light emitting diode L3 are not used in this embodiment.

Thus, the conveyance direction switching device 6 operates according to the moisture content measured by the moisture measuring device 5, and the conveyance path of the paddy is switched between two directions.

Therefore, since the paddy loaded in the dryer 9 always has a constant moisture content, the drying control operation becomes very simple.

Next, the operation of the automatic drying device will be explained with reference to the flowchart shown in FIG.

FIG. 5a is a flowchart of the transport operation from the storage tank 2 to the dryer 9, and FIG. 5b is a flowchart of the drying operation of the dryer 9.

First, the condition of receiving the cargo and the state in the middle of the conveyance rotation are confirmed, and then a discharge program is set to determine from which place in the storage tank 2 the paddy is to be discharged.

When it is confirmed that the set is completed, discharge and rotation conveyance are started.

When the dryer 9 is empty, the shutter of the relay tank 1 is opened and the paddy is discharged from there and loaded into the dryer 9.

When the relay tank γ is no longer full, the paddy is transferred to the relay tank γ.
is staked out.

At this time, if the moisture content of the paddy is below the set value, the paddy is switched from the return conveyance path and placed in the relay tank I.
If it exceeds the set value, it is returned to the storage tank 2.

In addition, when the relay tank 1 is full and no more paddy can enter, the process is returned even if it is less than the set value.

If the tank to which paddy is returned is full, a return set is added and an alarm is issued.

When the dryer 9 is fully loaded with paddy, a display is displayed, the loading operation is stopped, and drying is started.

When the dryer 9 starts operating, the rice grains sequentially flow down and are discharged from the bottom, and are transported upward by an elevator and directly returned to the dryer 9, or are loaded into a finishing tank (not shown).

These controls are carried out by measuring the moisture content of a sample of paddy inside the machine.

The paddy put in the finishing tank' is tempered after drying, and then returned to the dryer 9 to be dried.

When the paddy is successively dried and reaches the target finishing moisture content, the stem drying operation is stopped.

As described above, according to the automatic drying device of the present invention, the moisture value of the grains that are loaded in the dryer is always kept constant, so that various types of This eliminates the need for manual changes at all, resulting in significant labor savings, as well as stable and smooth drying, which has the effect of improving the finished quality of grains.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of an embodiment of an automatic drying apparatus according to the present invention, FIG. 2 is a vertical sectional view of a moisture measuring device and a conveyance direction switching device, and FIG. 3 is a ll-In sectional view of FIG. 2. FIG. 4 is a circuit diagram of the control circuit of the conveyance direction switching machine, and FIG. 5 is a flowchart. 1...Pitching conveyor, 2...Storage tank,
3...Discharge conveyor, 4...Rotation elevator, 5...Moisture measuring device, 6...
...Conveyance direction switching machine, 1...Relay tank,
8... Elevator with dryer installed, 9...
Dryer, 11... Control circuit section, 14, 15...
...Selector switch, 52...Saucer, 53.
... Measuring instrument, 54 ... Moisture meter, 62 ...
...Substrate, 6za, 62b. 62c...Discharge port, 63...Direction switching path, 64...Cam strut, 66...Motor, 68a, 68b. 68c...Limit switch, 69a, 69b
. 69c... Actuator.

Claims (1)

[Claims] 1. In an automatic drying device that pre-dries the grains in a storage tank to lower the moisture content and then transports them to a dryer, the grains in the dryer are dried with hot air. A moisture measuring means and a conveying direction switching means operated according to the measured value of this means are provided on the grain conveying path, and if the moisture value measured by the moisture measuring means is larger than a predetermined set value, the grain is returned to the storage tank. , an automatic drying device that feeds grain to a dryer if the moisture value is less than a predetermined set value.