JP2899770B2 - Grain drying equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grain drying apparatus for reducing the size of a grain drying facility.

[0002]

[Prior art]

(1) Background of technology

[0004] The following is an example of harvested rice as a grain. At present, it is instructed to reduce the cost of harvested rice processing facilities in order to reform the marketability of harvested rice. In order to cope with the guidance from this country, it is urgent to reduce the construction cost of harvested rice processing facilities, and it is necessary to reduce the unit cost of farmers' facilities.

On the other hand, as a requirement for reforming this marketability, a harvested rice processing facility must guarantee the quality of the rice in the process of processing the harvested rice, ie, in the storage, drying and hulling processes of the harvested rice. . The quality of rice refers to mold, taste, cracking of the harvested rice at the time of storage, and misalignment of brown rice at the time of hulling. The Ministry of Agriculture, Forestry and Fisheries has determined the air volume per unit weight of stored rice with respect to the moisture content of harvested rice as a standard for the air volume at which mold does not occur in harvested rice. This is called the safety limit air volume ratio.

(2) Conventional technology

As shown in FIG. 2, the conventional grain drying apparatus adjusts the humidity of the outside air by maximizing (constantly) the processing capacity of the dehumidifier 1 and adjusts the outside air and humidity supplied from the outside air supply controller 2. The mixed air is mixed with the mixer 3 to obtain air having a predetermined temperature and humidity. In this case, since the processing capacity of the dehumidifier 1 is operated at the maximum, the processing capacity of the dehumidifier 1 may be insufficient depending on the conditions of the outside air temperature and humidity. In order to cope with the shortage of the processing capacity of the dehumidifier 1, the opening degree of the damper 5 is adjusted to reduce the air volume and obtain air at a predetermined temperature and humidity. This air is supplied to the harvested rice 7 stored in the bin 6 by the blower 4 to dry the harvested rice 7.

When the harvested rice 7 is dried, the safety limit air volume ratio is secured so that the lamination height H is determined so that even if the air volume G is reduced by adjusting the opening of the damper 5, the load 8 of the blower 4 is reduced. Was limited.

[0009]

SUMMARY OF THE INVENTION In the above-described conventional rice processing apparatus, the processing capacity of the dehumidifier is maximized, and
Since the height of the harvested rice stored in the bottle is limited and the air volume is adjusted only by the damper opening, the following problems are caused. That is, the load 8 of the blower 4
Is the product of the air volume G and the discharge pressure ΔP determined by the height of the harvested rice. Therefore, even if the stacking height H of the harvested rice is increased to increase the amount of stored bins and reduce the number of bottles, ΔP increases and the air volume G decreases. When the air volume G decreases in this manner, the temperature of the processing air increases because the dehumidifier is operated at the maximum processing capacity, and the humidity decreases, so that it becomes difficult to obtain air at a predetermined temperature and humidity. . As a result, the harvested rice at the bottom of the bottle is over-dried and the quality of the rice is deteriorated, or the dehumidifier is overheated. For this reason, the stacking height H of the harvested rice is limited. As described above, since the processing capacity of the dehumidifier and the stacked height H of the harvested rice are in an organic relationship, conventionally, the stacking height H of the harvested rice is set to 1 m or less in consideration of the safety limit airflow ratio, and the dehumidifier is used. The processing capacity was determined on the assumption that the harvested rice had the highest water content.

Since the stacking height H of the harvested rice is limited as described above, it is necessary to prepare a bottle sufficient to store harvested rice that is harvested in large quantities during the harvesting period (agricultural season), and Since the stacking height is limited to 1 m or less, a large number of bottles are required, the equipment is enlarged, the construction ratio is increased, and the burden on farmers is increased accordingly. In addition, during the off-farm season after harvest, most of these bottles must be kept empty, so that the maintenance cost is increased and the burden on the farmer is further increased.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has a processing facility capable of satisfying a safety limit air volume ratio and reducing the number of bottles without limiting the stacking height of harvested rice stored in the bottles. The purpose of the present invention is to provide a rice processing apparatus for reducing the size of rice.

[0012]

According to the present invention, there is provided a method for mixing air having a predetermined temperature and humidity by mixing outside air and air whose humidity has been adjusted by a dehumidifier in a mixer. In a drying apparatus that supplies grains into the bin with a blower and dries the grains, the processing capacity of the dehumidifier is controlled in accordance with the amount of air that varies according to the layer height of the grains stored in the bin. Is what you do.

[0013]

According to the present invention, the discharge pressure of the blower is determined by the height of the pile of harvested rice, and the processing capacity of the dehumidifier is determined by the air volume obtained under the discharge pressure of the blower at this time. Can be adjusted. By adjusting the processing capacity of the dehumidifier corresponding to the layer height of the harvested rice, the safety limit air volume ratio is satisfied, and the limitation on the layer height of the harvested rice is eliminated.

[0014]

An embodiment of the present invention will be described below. In FIG. 1, the dehumidifier 1 has a variable processing capacity, or a plurality of dehumidifiers 1 are installed. Reference numeral 2 denotes an outside air supply controller, which mixes the air whose temperature and humidity have been adjusted by the dehumidifier 1 with the outside air supplied from the outside air supply controller 2 according to the conditions of the temperature and humidity of the outside air. The processing amount of the dehumidifier 1 and the outside air supply amount of the outside air supply controller 2 are adjusted so that the air at the outlet 9 of the mixer 3 has a predetermined temperature and humidity with respect to the air amount determined by the stack height H of the harvested rice 7. Adjust. The air whose temperature and humidity have been adjusted in this manner is supplied to the harvested rice 7 stacked in the bottle 6 by the blower 4. The stacking height H of the harvested rice 7 varies depending on the harvesting conditions such as the time of harvesting the rice or the time for receiving the harvested rice.

The operation of the embodiment constructed as described above will now be described. First, since the amount of the harvested rice 7 stored in the bottle 6 varies depending on the harvesting conditions such as the harvest time and the time for receiving the harvested rice, the stacking height H also varies. Since the resistance of the air passing through the harvested rice 7 increases as the stacking height H increases, ΔP at the load 8 of the blower 4 varies. Following the variation of ΔP, the processing capacity of the dehumidifier 1 and the supply air volume of the outside air supply controller 2 are adjusted, and the mixer 3
Is controlled so that the air volume at the outlet 9 is exactly the air volume G at the load 8 of the blower 4 and reaches a predetermined temperature and humidity.

Since the air volume G decreases as the stacking height H of the harvested rice 7 increases, the condition of the safe limit air volume ratio cannot be satisfied if the stacking height is infinitely increased. Therefore, at the planning stage of the drying facility, the capacity of the blower 4, the processing capacity of the dehumidifier 1, and the stacking height H are determined most rationally in consideration of the safety limit air volume ratio. That is, the stacking height H is a factor that determines the capacity and the number of the bottles 6, and the blower 4 and the dehumidifier 1 consume power, which is a factor that determines economical efficiency. Is done.

[0017]

As described above in detail, according to the present invention, drying is controlled by the processing capacity of the dehumidifier and the grain stacking height, so that the grain stacking height can be changed. Thus, the number of bottles can be minimized, the size of the drying facility can be reduced, and the overall economy of the drying facility can be improved.

[Brief description of the drawings]

FIG. 1 is a flow chart showing one embodiment of the present invention.

FIG. 2 is a flow chart of a conventional example.

[Description of sign]

 REFERENCE SIGNS LIST 1 Dehumidifier 2 Outside air supply controller 3 Mixer 4 Blower 6 Bottle 7 Harvested rice 8 Load H Stacking height

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F26B 21/00 A01F 25/00 F26B 21/08

Claims (1)

(57) [Claims] 1. A drying apparatus for mixing outside air and air whose humidity has been adjusted by a dehumidifier by a mixer, supplying air having a predetermined temperature and humidity into a bin by a blower, and drying the grain, wherein the bin is An apparatus for drying grain, wherein the capacity of the dehumidifier is controlled in accordance with the amount of air blown by the layer height of the grain stored in the grain.