JPH0534069A - Cooling method in grain drying device - Google Patents

Abstract

PURPOSE:To prevent grains from becoming stuffy when temperature is high or absorbing moisture when temperature is low by a method wherein the operation and stopping of the ventilation of atmosphere and circulating flowing are controlled selectively in accordance with a comparision result of the detecting temperature of the grains with a set temperature, upon shifting the grains from a drying section into a cooling tank. CONSTITUTION:A grain drying device is constituted of a grain drying unit 4, provided with a burner 10 and the like, and a natural cooling tank 5, equipped with an elevator 15, a shifting screw trough 22 and the like on the upper surface thereof, which are built up ventically. Grains are supplied from a hopper 53 into the grain drying unit 4 through a charging conveyer 52, the elevator 15, a communication pipe 18 and a circulating and shifting trough 20. In this case, a grain temperature upon finishing drying is detected. When the detected temperature is higher than a first set value, the grains are circulated in the grain drying unit 4 and, thereafter, are shifted into the natural cooling tank 5. On the other hand, when the detected temperature is lower than the first set value and higher than a second set value, lower than the first set value, ventilating drying, effected only by atmosphere, is effected and, thereafter, the grains are shifted into the natural cooling tank 5. When the detected temperature is lower than the second set value, the ventilating operation is stopped.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling method for a grain drying device.

[0002]

2. Description of the Related Art Grains that have been dried to a predetermined moisture value by a grain drying device are not preferable to be subjected to the subsequent preparation process immediately afterwards, and they are stored in a cooling tank attached to them for the purpose of lowering the grain temperature and shifting the moisture content. There is a method of transferring and leaving for a while, and a method of introducing outside air for a predetermined time after drying, performing ventilation operation, and then transferring to the cooling tank side is known (JP-A-61-2).
No. 05776, JP-A No. 61-205783).

[0003]

By the way, the above-mentioned embodiment is designed in a ventilated operation in consideration of the harmful effect caused by transferring to the cooling tank, that is, when it is transferred to the cooling tank with a high grain temperature, stuffiness is likely to occur. It is intended to lower the grain temperature to lower the grain temperature in the post-cooling tank and transfer water, but for grains that originally have a low grain temperature, the ventilation operation causes a moisture absorption phenomenon, which may cause cracks in the body. There is.

[0004]

SUMMARY OF THE INVENTION In order to solve the above drawbacks, the present invention provides a grain drying section 4 and a cooling tank 5 side by side, and dries the grain stuck in the grain drying section 4 to a predetermined moisture value. After the completion, the grain temperature is lowered and the water content is transferred to the cooling tank 5 to have the grain temperature detecting means for detecting the grain temperature at the time of finishing the grain drying. When the value exceeds the first predetermined value A, it is circulated in the grain dryer 3 and transferred to the post-cooling tank 5, and the detected grain temperature is the first predetermined value or less and the second predetermined value lower than this predetermined value. When it is B or more, it is transferred to the cooling tank 5 after being ventilated and dried only by the outside air for a predetermined time, and when the detected grain temperature is the second predetermined value B or less, the cooling operation is stopped in the cooling tank 5. The cooling method in the grain drying equipment to be transferred shall be configured.

[0005]

When the grain is transferred from the grain drying section to the cooling tank, the grain temperature is checked, and when the grain temperature is higher than the first predetermined temperature, the outside air ventilation is stopped to circulate and flow, and the grain is transferred to the subsequent cooling tank. Below a predetermined value of 2, the ventilation operation is stopped and the cooling air is transferred to the post-cooling tank, and between these first and second predetermined values, the cooling air tank is transferred to the post-cooling tank with outside air ventilation.

Therefore, it is possible to prevent the above-mentioned stuffiness at high temperature, or to reduce the moisture absorption phenomenon of low-temperature grains and reduce grain damage.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. The grain drying device includes a grain drying unit 4 in which a storage tank 1, an aeration drying unit 2 and a grain collecting unit 3 are vertically stacked, and a cooling tank provided by being placed on the upper part of a machine frame of the grain drying unit 4. 5 and are formed in a vertically long rectangular parallelepiped shape.
Of these, the aeration drying section 2 of the grain drying section 4 interposes the four tanks of grain flow-down passages 6, 6 ...
Forming hot air chambers 7, 7 and exhaust air chambers 8, 8 ... On the left and right sides, the air sucked by the suction fan 9 is turned into hot air by the burner 10, and the hot air is blown to the grains flowing down the grain flow passages 6, 6. Is made to act. Reference numerals 11, 11 ... Depict valves provided at the lower portions of the grain flow-down passages 6, 6 ... to gradually flow down the grain.

A horizontal transfer gutter 13 having a transfer spiral 12 is provided at the lower part of the grain collecting section 3 which receives the fed grains from the respective feeding valves 11, 11 ... Connected to. The elevator 15 is located on the machine frame rear side of the grain drying section 4 and the cooling tank 5, and is erected at a height slightly higher than that of the cooling tank 5. An endless belt having buckets attached at predetermined intervals is wound inside the elevator 15 between upper and lower pulleys, and the grain or the like from the 13 parts of the horizontal transfer gutter can be picked up and thrown toward the 16 parts of the throwing port at the upper part thereof. It is in the form.

A switching valve 17 is provided at the outlet 16 portion.
And is configured to be selectively supplied to the first opening portion a and the second opening portion b in accordance with the switching operation thereof. In addition, the first opening (i) has the discharge side end in front of the connecting pipe 18 connected to the beginning end side of the circulation transfer gutter 20 with the transfer spiral 19 built in before and after the ceiling part of the storage tank 1. On the other hand, the second opening B is to be seen on the starting end side of the cold-cooling transfer trough 22 having the built-in transfer spiral 21 arranged in the same shape on the ceiling of the cold-cooling tank 5.

The above-mentioned transfer spiral 19 trough 20 and transfer spiral 2
One gutter 22 is extended to the central upper position of each tank part, and can be supplied to the surface of the rotary diffuser 23 or 24. The cooling tank 5 has a cooling section 25 having substantially the same capacity as the storage tank 1 of the grain drying section 4, and a cooling section 25 having a V-shaped cross section under the cooling section 25. Feeding part 27 formed on
Consists of. The feeding section 27 is internally provided with transfer spirals 28, 28 for discharging the sequentially collected grain so as to horizontally transfer it.

Bottom valves 30, 3 are provided at the bottom of each discharge transfer gutter 26.
0 is provided, and the bottom valve can be opened by appropriately rotating the bottom valve around the fulcrum. This bottom valve 3
With the switching operation of 0, the grain from the feeding section 27 can flow down into the storage tank 1 on the grain drying section 4 side through the open ceiling c of the grain drying section 4. The raw paddy is temporarily stored in the cooling tank 5 and then transferred to the grain drying section 3 for hot air drying, or the paddy is put in the cooling tank 5 as well as the storage section 1 in a vertically connected state to dry at once. This is because

The bottom valve 30 has a cutout hole 30a formed in the side wall of the cooling tank 5 so that the bottom valve portion end 30b is projected to the outside to facilitate the assembly. Further, the transfer end side of each of the discharge transfer spirals 28, 28 is projected to the outside of the machine frame, and a belt conveyor form is provided from each end side discharge port (not shown) through a flow-down guide cylinder part (not shown). It is configured to be supplied to the discharge conveyor 51 of.

The supply start end of the circulation transfer gutter 20 is located outside the machine frame, and a discharge port is formed at the lower part of the communication pipe 18 so that it can be discharged to the discharge conveyor 51. A squeeze conveyor 52 is provided below the discharge conveyor 51, and the discharge opening / closing section can be connected to the hopper 53.

The cooling tank 5 has a double structure of the inside and the outside, and the inner peripheral side is constituted by a perforated plate 31, and the outer side is constituted by an open / close panel plate 32 so as to be freely opened and closed. A ventilation mechanism (not shown) is appropriately provided on the ceiling or the like, and the ventilation switch for introducing the outside air can be performed from the blanking plate 31 by operating the operation switch. The controller 33 provided in the grain dryer is provided with the drying unit 4 and the cooling tank 5 for loading and drying (the cooling tank 5
Ventilation) / moving / discharging / stopping operation switches 34-
38, 39 to 43 are provided. In addition to these switches, it also has respective operation switches 44, 45, 46 capable of setting drying conditions such as grain type, set water content, and amount of overhang. Reference numeral 47 is a single / double setting switch.

FIG. 4 is a control block diagram, in which the arithmetic and control unit 48 of the controller 33 for executing the drying control of the two-layer dryer comprising a storage tank and a cooling tank,
Drying unit 4 side operation switches 34 to 38, and cooling tank 5 side operation switches 39 to 43 inputs, single / double setting switch 47 inputs, moisture meter 48 ', hot air temperature sensor 49, grain temperature detection sensor 50, etc. While accepting analog inputs and other setting switches and sensor inputs, the output information includes combustion system output, motor output, operation display monitor output, abnormality display monitor output, and the like. Incidentally, one or a plurality of grain temperature detection sensors 50 are arranged at any position in the process of reaching the storage tank 1 to the grain collection chamber.

The operation of the above example will be described. Grains (eg, paddy) harvested in the field are transported by a truck or the like, and are thrown into a hopper 53 connected to the elevator 15 via a stake conveyor 52. In this way the grain is lifted 1
5, It passes through the connecting pipe 18 and the circulation transfer gutter 20, and is stuck in the storage part 1.

When the amount of swelling, the final moisture value, etc. are set and the drying switch 35 is turned on, the grain is circulated in the grain drying section 4 via the elevator 15 and dried by the burner hot air (step 100). During the drying, the moisture value is monitored moment by moment, and when the finish moisture value is reached (step 110), the burner is stopped and the drying is finished (step 120).

Next, the movement switch 36 is turned on to move the dry grains to the cooling tank 5 (step 13).
0), the grain temperature is detected based on the operation of the movement switch 36 (step 140). Detected grain temperature TG is first
Is compared with a predetermined value A (step 150), and if TG> A, the suction fan 9 is stopped (step 160),
The grain drying unit 4 is circulated for a predetermined time or a predetermined number of times (step 170). When the predetermined time or the predetermined number of times has been completed (step 180), the switching valve 17 is switched to the opening b side supply and the grain is transferred to the cooling tank 5 (step 190). As a result, when the grain temperature is high, ventilation is performed to promote drying, which in turn prevents overdrying.

If TG≤A in step 150, the first
The second predetermined value B lower than the predetermined value A is compared (step 200), and if A ≧ TG ≧ B (while continuing to operate the suction fan 9), grain circulation is performed for a predetermined time in a ventilation state (step 210). .. When a predetermined time has passed (step 22
0), the suction fan 9 is transferred to the cooling tank 5 while still operating. In such a state, ventilation cooling is effective without fear of overdrying.

When TG <B in step 200, the suction fan 9 is stopped (step 230) and immediately moved to the cooling tank 5. This is because if the grain temperature is low, moisture may be absorbed depending on the conditions of the outside air, and it is desirable to avoid ventilation. Grain cooling in the cooling tank 5 is performed in a stationary state, but the grain temperature is reduced and moisture unevenness is corrected, and when the temperature approaches room temperature, it is appropriately taken out and transferred to the hulling process. During the cooling process, the open / close panel plate 32 may be opened or a ceiling fan or the like outside the drawing may be driven to prevent stuffiness when necessary.

Although the grain temperature is directly detected by the grain temperature detecting sensor 50 in the above embodiment, a method of estimating the weighted average value of the hot air temperature and the exhaust air temperature as the grain temperature may be used instead. ..

[Brief description of drawings]

FIG. 1 is a front view of a dryer.

FIG. 2 is a front sectional view of a dryer.

FIG. 3 is a front view of a controller.

FIG. 4 is a control block diagram.

FIG. 5 is a flow chart diagram.

FIG. 6 is an enlarged view of a feeding unit.

[Explanation of symbols]

1 Storage tank 2 Aeration drying section 3
Grain collecting section 9 Suction fan 10 Burner 17
Switching valve 30, 30 Bottom valve 33 Controller 34-38 (grain drying unit 4 side) operation switch 39-43 (cooling tank 5 side) operation switch 48 Calculation control unit 50 Grain temperature detection sensor

Front page continued (72) Inventor Shigeo Kobayashi, No. 1 Yakura, Tobe-cho, Iyo-gun, Ehime Prefectural Engineering Department, Iseki Agricultural Machinery Co., Ltd. ) Inventor Kosaku Maeda No. 1 Yakura, Tobe Town, Iyo-gun, Ehime Prefecture

Claims (1)

Claims: 1. A grain drying section 4 and a cooling tank 5 are provided side by side, and the grain stuck in the grain drying section 4 is dried to a predetermined moisture value, and then the cooling tank is cooled. When the grain temperature detecting means exceeds the first predetermined value A, the grain temperature detecting means for detecting the grain temperature at the time of completion of grain drying is provided. Is circulated in the grain dryer 3 and transferred to the post-cooling tank 5, and when the detected grain temperature is equal to or lower than the first predetermined value and equal to or higher than a second predetermined value B lower than the predetermined value, the outside air is blown for a predetermined time. A method of cooling in a grain drying device in which the grain is dried by ventilation and then transferred to the cooling tank 5, and when the detected grain temperature is not more than the second predetermined value B, the ventilation operation is stopped and the grain temperature is transferred to the cooling tank 5.