JPS6140910B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a grain drying device that is installed in a rice center or the like and dries grain that has been intensively harvested.

At the rice center, raw paddy that has been harvested and threshed using a combine harvester is collected from various locations, dried in an integrated process, and then hulled to become rice and shipped. In other words, the collected high-moisture raw paddy is supplied from the receiving hopper to the coarse sorter.
After being roughly sorted to remove impurities, it is loaded into a storage tank by a loading elevator. The loaded rice is pre-dried in this storage tank for a certain period of time in conditions close to natural drying, and its initially high moisture content drops to, for example, 18%. The rice pre-dried in this way is conveyed by a conveyor and an elevator to a down-flow type dryer and placed in it, and is dried with hot air in this dryer to reduce the moisture content to, for example, about 15%. After the dried paddy is tempered in a tempering tank, it is supplied to a huller, where it is hulled, paddy sorted and grain sorted, and then shipped as a product.

When drying with hot air, the pre-dried paddy is transported from the storage tank and sequentially put into the dryer and tempering tank. When the specified amount is filled, a sensor is activated and the transport stops automatically. is,
Next, circulation drying is started in which the material is circulated between the dryer and the tempering tank. An example of such a grain drying apparatus is the one shown in Japanese Patent Publication No. 55-6829.

However, there is no problem when there is enough grain to dry, but at times such as when grain varieties are changed or when harvesting is completed, the amount of grain is insufficient and the dryer and tempering tank are filled with the specified amount. Sometimes I can't get into it. If the specified amount of grain is not loaded in this way, the sensor that detects the fullness will not operate, so there is a problem in that the automatic control function for starting circulation drying cannot be performed and manual operation is required.

The present invention was made to solve these conventional problems, and its purpose is to:
To provide a grain drying device capable of automatically starting a drying operation when drying conditions are met even if the amount of grain charged in a dryer and a tempering tank is less than a specified amount.

To achieve this objective, the present invention detects with a bin leveler that the dryer is full of grain,
When the leveler detects that a predetermined amount of grain has been poured into a predetermined tempering tank, the grain tensioning operation is stopped, and the bin leveler detects that it is full.
When the leveler does not detect a predetermined amount of tension and the flow sensor detects that there is no grain being conveyed along the grain conveyance path, the drying operation is started after a certain period of time.

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

FIG. 1 is a block diagram of an embodiment of a grain drying apparatus according to the present invention. In the figure, paddy has been conveyed by a loading conveyor 1, is conveyed upward by a loading elevator 2, and is supplied into a tank of a dryer 3 from above. Here, 4 is a flow sensor installed on the tensioning conveyor 1 to detect the presence or absence of paddy being conveyed;
6 is a bin leveler that detects when the dryer 3 is full, and 6 is a discharge shutter for discharging the paddy inside the dryer 3. When the discharge shutter 6 operates and the paddy inside the dryer 3 is discharged, the paddy is conveyed to the tensioning conveyor 9 via the discharge conveyor 7 and the elevator 8, and then to each tempering tank 10, 11,
They are sequentially attached to predetermined objects 12 and 13. Here, 14, 15, 16, and 17 are the filling shutters of each tempering tank, 18, 19, 20, and 21 are the same discharge shutters, and 22, 23, 24, and 25 are also the ones that detect when the tank is empty. It is a bottle level vera. Further, 26, 27, and 28 are bin levelers that detect when the tempering tanks 10, 11, and 13 are full, and 29 is a capacitive leveler that operates when a predetermined amount of paddy is put into the tempering tank 12. It is. This leveler consists of multiple sensors arranged above and below the tank, and if you set any one of them, it will operate when the paddy is stretched to the position of that sensor, and the set amount of paddy will be stretched in the tank. detects that it has been inserted. Therefore, unlike other tanks, the tempering tank 12 can be filled with any desired amount. These levels constitute the detection means.

When the drying work is performed after the piling work is completed, the paddy discharged from each tempering tank is conveyed by the discharge conveyor 30 and the elevator 31, and then returned to the dryer 3.
The paddy is dried while being circulated. When drying is completed, the discharge conveyor 30 moves in the opposite direction shown by the dotted arrow, and the paddy discharged from each tank is conveyed by the elevator 32 and conveyor 33 and placed in condensation tanks 34 and 35. The paddy discharged from the condensation tanks 34 and 35 is conveyed to a conveyor 36 and supplied to a huller.

Hot air is supplied to the dryer 3 by a wind pipe provided in the tank, and the hot air is discharged through the grains of rice to remove moisture on the surface of the grains. Once the moisture on the surface of the rice has been removed, the internal moisture will eventually come out to the surface, so the dried rice needs to be tempered for a certain period of time in a tempering tank and then dried again. By performing circulation drying while tempering in this manner, the paddy is sufficiently dried to the core. The wind pipe has a triangular or pentagonal cross section (home base shape) with a pointed upper part and an open lower part, and a plurality of wind pipes for blowing air extend inward from one side of the tank. A plurality of wind pipes for discharge are similarly provided at positions vertically shifted relative to each other from the other side. Since the paddy inside the tank is supplied from above, when the paddy fills the windpipe, a space is formed in the windpipe at a predetermined angle of repose where no paddy can enter. When hot air is supplied to the fast-air wind pipe, the hot air enters the rice grain from the open lower part of the wind pipe, passes between the grains, enters the space of the pipe from the open lower part of the discharge wind pipe, and is discharged. be done. Therefore, if the wind pipe is not buried in the rice grains but is exposed, the rice may be sucked into the discharge wind pipe and discharged by the blast of air. For this reason, the dryer is usually operated when it is full of paddy.

In the configuration shown in FIG. 1, when the dryer 3 is full of rice discharged by the loading conveyor 1 and the loading elevator 2, the discharge shutter 6 is opened and the rice is conveyed from below. The discharged rice is conveyed by a discharge conveyor 7, an elevator 8, and a loading conveyor 9, and is loaded into a tempering tank 10. When the tempering tank 10 is full, the rice is put into a tempering tank 11, and when the tempering tank 11 is full, the rice is put into a tempering tank 12. When a predetermined amount of paddy is put into the tempering tank 12, each conveyor and elevator are stopped by the operation of the leveler 29, and the putting work is stopped. In this case, the tempering tank 13 is empty. Therefore, in this embodiment, the predetermined amount of the total charging amount of the dryer and the tempering tank group is set by the leveler 29.

Once the tensioning work is completed, drying operation will automatically start. After the first drying by the dryer 3 is completed, the rice is put into a tempering tank 13 and tempered. The rice grains in the tempering tank 10 are placed in the dryer 3 and dried. In this way, the rice in the tempering tank is sequentially dried in the dryer and then returned to the tempering tank for circulation drying. Such circulation drying is controlled by a control circuit based on a detection signal from a bottle leveler or the like. Note that the posting order can be set arbitrarily.

FIG. 2 is a circuit diagram showing part of the control circuit.
In the figure, when push switch PB ₁ for starting is pressed, relays X ₀ and X ₁ operate and relay contacts x ₀₁ ,
x ₀₂ , x ₀₃ , x ₀₄ , x ₀₅ , x ₀₆ and x ₁₁ , x ₁₂ , x ₁₃ are turned on, and power supply voltage is applied to each circuit.
By turning on relay contact x ₀₁ , relays X ₀ and X ₁ are self-maintained in operation. Note that PB ₂ is a push switch for stopping, and when pressed, the self-holding of relays X ₀ and X ₁ is released and the circuit returns to its initial state.
fs ₁ and fs ₂ are switches for the flow sensor 4, and when there is paddy on the loading conveyor 1, fs ₁ is on and fs _{2 is} on.
is off, and when there is no more paddy to be conveyed to the loading conveyor 1, _fs1 is turned off and _fs2 is turned on. Under normal conditions, there is paddy on the tensioning conveyor 1 even during the tensioning operation or during drying operation after the tensioning is stopped, so the switch fs ₁ is on and fs ₂ is off. In addition, s ₁ is a normally closed switch that turns off when the bin leveler 5 of the dryer 3 detects that it is full of paddy, and s ₂ is a leveler 29 of the tempering tank 12.
This is a normally closed switch that turns off when it detects that a predetermined amount of paddy has been added.

Here, with the operation of relay x ₀ , relay contact x ₀₂
When turned on, off-delay timer _T1 is set. When this timer _T1 is set,
Timer contact _t11 is turned on immediately, and after a certain period of time, timer contact _t12 is turned on, and when the current is cut off and reset, timer contact _t12 is immediately turned off, but timer contact _t11 is turned on for a certain period of time. It works so that it turns off after a certain amount of time has elapsed. Therefore, when timer T ₁ is set, timer contact t ₁₁
immediately turns on, relay _M1 operates and relay contact _m1 turns on. Then, when relay contact _m1 is turned on, timer _T2, which is also an off-delay type, is set, and timer contact _t2 is immediately turned on, and relay _M2 is turned on.
works. The operation of relays M ₁ and M ₂ causes a switch circuit (not shown) to operate, thereby operating the staking conveyor 1 and staking elevator 2, respectively.

On the other hand, when the relay contacts x ₁₁ , x ₁₂ , and x ₁₃ are turned on, the relays M ₃ , M ₄ , and M ₅ are operated, respectively, and a switch circuit (not shown) is activated to operate the discharge conveyor 7, the elevator 8, and the stacking system. The conveyors 9 each operate. Furthermore, when timer contact _t12 is turned on after a certain period of time has elapsed since timer _T1 was set, relay _X2 is operated and relay contact _x2 is turned on. When relay contact x ₂ is turned on, relay M ₆ is activated and relay contact m ₆ is turned on, and this relay contact
Turning on _m6 activates relay _M7 . relay
When M ₆ and M ₇ operate, a switch circuit (not shown) operates, and the discharge conveyor 30 and elevator 31 operate, respectively.

Note that Th ₁ , Th ₂ , Th ₃ , and Th ₄ are turned off when the loading conveyor 1, loading elevator 2, discharge conveyor 30, and elevator 32 become overloaded due to clogging of paddy, etc., while they are in operation. This is a protection switch to stop the operation.

During the tensioning work in which paddy is put into the dryer and tempering tank group, when the specified amount of paddy to be dried is put in and the switch _s2 of the leveler 29 is turned off, the timer _T1 is reset, and after a certain period of time has elapsed, the timer T1 is reset. Timer contact _t11 is turned off, relay _M1 is restored, and relay contact _m1 is turned off. At the same time, timer _T2 is reset, and after a certain period of time has elapsed, timer contact _t2 is turned off and relay _M2 is reset.
As a result, the tensioning work is stopped, and when the relay _M2 returns, a starting circuit (not shown) is activated and circulation drying is automatically started. Therefore, the switch
If _s2 is not turned off, circulation drying will not start.

Here, when the amount of paddy is not stored sufficiently and the flow sensor 4 detects that there is no more paddy to be conveyed before the specified amount of paddy is strung during the tensioning operation, the switch fs ₁ is activated. turns off and fs ₂ turns on. Timer T ₁ is reset by turning off switch fs ₁ , and after a certain period of time, relay M ₁ is reset by turning off timer contact t ₁₁ , which causes stringing conveyor 1 to string all the paddy being transported. It is supplied to elevator 2 and stopped. At the same time _, the timer _T2 is reset by turning off the relay contact _m1 , and after a certain period of time, the relay _M2 is reset by turning off the timer contact t2. supply and stop. And the relay
Circulation drying is automatically started by the return of _M2 . These elements constitute a means that operates when a specified amount of grain is not loaded and there is no grain being conveyed for loading, and starts drying operation after a certain period of time.

Note that the timer times of timers T ₁ and T ₂ are set to a time during which the wind pipe of the dryer is not exposed.

On the other hand, when switch FS ₂ is turned on, buzzer B operates to issue an alarm.

With the above configuration, as long as the dryer is fully filled with grain, drying operation is automatically performed even if the tempering tank is not filled with a predetermined amount of grain. Troublesome manual operations are no longer required. Even in times when grain is scarce, automatic drying operation is possible as long as there is enough grain to fill the dryer.

Note that the drying operation does not start for a certain period of time even if the flow sensor no longer detects the grain being conveyed. Even under normal conditions, the grain may be partially chipped on the loading conveyor, and this condition is detected. This is because it would be bad if you did. Drying operation is carried out after confirming that no grain is being transported for a certain period of time.

As described above, according to the grain drying device of the present invention, even if the amount of grain to be loaded into the dryer and tempering tank is less than the specified amount, as long as there is enough grain to fill the dryer, the grain to be loaded can be Drying operation can be started automatically if the product is not transported for a certain period of time, eliminating the need for troublesome manual operations and improving operability.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of a grain drying apparatus according to the present invention, and FIG. 2 is a circuit diagram of a part of a control circuit. 1,9...Pitching conveyor, 2...Pitching elevator, 3...Dryer, 4...Flow sensor, 5,2
2, 23, 24, 25, 26, 27, 28... Bin leveler, 6, 18, 19, 20, 21... Discharge shutter, 7, 30... Discharge conveyor, 8, 31
...Elevator, 10, 11, 12, 13... Tempering tank, 14, 15, 16, 17...
Staking out, 29... Leveler.

Claims (1)

[Claims] 1. In a grain drying device in which grain is loaded into a dryer and a group of tempering tanks, and when a specified amount of grain has been loaded, loading is stopped, and then the grain is circulated to perform drying operation, the grain to be loaded is A flow sensor is provided on the conveyance path to detect the presence or absence of grain to be conveyed, a bin leveler is configured to detect when the dryer is full of grain, and a predetermined amount of grain is placed in a predetermined tempering tank of the tempering tank group. a leveler for detecting that grain has been set; means for detecting that the bin leveler is full of grain; and means for stopping the grain tensioning operation when the leveler detects that a predetermined amount of grain has been set; control for starting the drying operation after a certain period of time when the leveler detects that the grain is full, the leveler does not detect a predetermined amount of grain being loaded, and the flow sensor detects that there is no grain to be conveyed; Grain drying equipment comprising means.