JP2020146018A - Pre-drying device in hot water disinfection equipment for disinfecting seeds with hot water - Google Patents

Abstract

To provide a relatively inexpensive pre-drying device capable of maintaining the water content of seed rice within the range of 7 to 10% in a drying treatment step prior to a hot water treatment step.SOLUTION: There is provided a pre-drying device in a hot water disinfection equipment, comprising a container box 3 that has a mesh structure on the bottom surface 2 to store grains, a container base 4 that allows the container box 3 to be placed, and has an open top surface that allows ventilation to the container box 3, a hot air generator 5 for generating hot air, and a flexible duct 6 having one end connected to the hot air generator 5 and the other end connected to a ventilation port of the container base 4. The open top surface of the container base 4 is separated to a plurality of opening sections so that a plurality of container boxes 3 can be placed. A plurality of container bases 4 may be arranged close to each other.SELECTED DRAWING: Figure 1

Description

The present invention relates to a pre-drying device in a hot water disinfection facility for disinfecting paddy rice seeds (seed paddy) with hot water.

Conventionally, in hot water disinfection of paddy rice seeds (hereinafter referred to as "seed"), it is effective to reduce the water content to 7 to 10% before immersing the seeds in hot water in order to increase the high temperature resistance of the seeds. Based on the finding that there is, the applicants have proposed to provide a drying treatment step prior to the hot water treatment step (see, for example, Patent Documents 1 and 2).
By the way, when drying seeds, it is conceivable to use a small circulating grain dryer for farmers to dry the seeds by ventilation, but the amount of seed rice handled is smaller than that of edible rice, and therefore, in some cases. May not be enough to fill the drying area of the circulating grain dryer, and if the seed rice is of many varieties, the inside of the circulating grain dryer had to be thoroughly cleaned each time. ..

On the other hand, the applicant has proposed a drying device for drying the seed rice after the hot water treatment (see Patent Document 3), but this device stores the seed rice stored in the net in a multi-stage drawer. It is air-dried, but it was difficult to handle in the case of loose seed rice. On the other hand, since ventilation is performed for each of the drawers, there is an advantage that drying proceeds evenly, but since this drying device is a processed sheet metal product, the cost is high.

That is, in the hot water disinfection method in which the drying treatment step is provided prior to the hot water treatment step, the water content of the seed rice may be maintained within the range of 7 to 10% in the drying treatment step, and strict water control is performed. Is not required. Therefore, consumers have requested a relatively inexpensive drying device.

Japanese Unexamined Patent Publication No. 2015-146775 JP-A-2017-38535 Japanese Unexamined Patent Publication No. 2008-14517

In view of the above problems, it is a technical problem to provide a relatively inexpensive pre-drying apparatus capable of maintaining the water content of seed rice within the range of 7 to 10% in the drying treatment step prior to the hot water treatment step. And.

In order to solve the above problems, in the present invention, the upper surface of the container base is opened so that a container box having a mesh structure on the bottom surface can be placed, and the discharge portion of the other end of the flexible duct having one end connected to the hot air generator is the container base. It is a pre-drying device in a hot water disinfection facility connected to the ventilation port of
The upper surface of the opening of the container base is divided into a plurality of opening sections, and a plurality of container boxes can be placed on the opening.

The invention according to claim 2 is characterized in that a plurality of the container bases are installed, and the plurality of container bases and the hot air generator are connected by a flexible duct formed by a main pipe and a branch pipe. To do.

In the invention according to claim 3, the container base side wall is provided with a ventilation port for supplying hot air, a duct is attached to the ventilation port, and the duct is provided with a shutter for controlling the amount of hot air ventilation. It is characterized by that.

The invention according to claim 4 is characterized in that the container boxes are stacked and placed in a plurality of stages on the container base.

According to the fifth aspect of the present invention, when a predetermined time has elapsed from the start of drying, the dried container boxes at the bottom of the container base are sequentially taken out of the machine, while the undried container boxes at the top of the container base are undried. It is characterized by placing a container box containing new paddy and restarting drying.

According to the present invention, even when only a small amount of paddy to be pre-dried before hot water disinfection is secured (for example, 300 kg to 400 kg), dozens of the above-mentioned ventilable container boxes are prepared. Since it can be divided into small portions of 10 to 15 kg and placed on a container base for drying, it can be adjusted according to the amount of paddy, and the water content of the paddy is within the range of 7 to 10%. It has become possible to provide a low-priced pre-drying device that can dry up to.

According to the invention of claim 2, a plurality of container bases are installed, and the plurality of container bases and the hot air generator are connected by a flexible duct formed by a main pipe and a branch pipe. The worker can flexibly install a single container base or a plurality of container bases according to the amount of paddy to be pre-dried.

According to the invention of claim 3, the container-based ventilation port is provided with a duct for connecting the flexible duct, and the duct is provided with a shutter for controlling the amount of hot air. , The amount of hot air can be controlled according to the number of container boxes placed on the container base.

Further, in the invention according to claim 4, the container boxes are stacked and placed in a plurality of stages on the container base. Then, in the invention of claim 5, when a predetermined time elapses from the start of drying, the dried container boxes at the bottom of the container base are sequentially taken out of the machine, while the top of the container base is not. If it is a pre-drying device that implements a drying method in which a container box containing new paddy is placed and drying is restarted, the form of drying can be appropriately changed according to the situation at the site and the amount of paddy. it can.

It is a perspective view of the pre-drying apparatus which shows one Example of this invention. It is a side view of the same as above (when viewed from the direction of arrow A in FIG. 1). It is a front view of the same as above (when viewed from the direction of arrow B in FIG. 1). It is a rear view of the same as above (when viewed from the direction of arrow C in FIG. 1). It is a plan view of the same as above (when viewed from the arrow D direction of FIG. 1). It is a vertical cross-sectional view of the same as above (when broken along the line EE of FIG. 5). It is a perspective view of the pre-drying apparatus provided with a plurality of container bases. It is a flowchart at the time of performing a drying process. Weight / moisture conversion table (weight / moisture quick reference table) It is the schematic sectional drawing of the 2nd Embodiment (a pre-drying apparatus which can be dried while being put in a net bag for immersion).

[First Embodiment]
A first embodiment for carrying out the present invention will be described with reference to the drawings. 1 is a perspective view of a pre-drying apparatus showing a first embodiment of the present invention, FIG. 2 is a side view, FIG. 3 is a front view, and FIG. 4 is a rear view. 5 is the same plan view, and FIG. 6 is the same vertical sectional view.

In FIGS. 1 to 6, in the pre-drying device 1 in the hot water disinfection facility, a container box 3 having a mesh structure on the bottom surface 2 and capable of storing grains and a container box 3 on which the container box 3 can be placed is opened. A container base 4 formed in the container box 3 so as to be ventilated, a hot air generator 5 for generating hot air, and one end connected to the hot air generator 5 and a discharge portion at the other end of the container base 4. The main part is composed of the flexible duct 6 connected to the ventilation port.

The container box 3 is a commercially available plastic container (for example, a container having internal dimensions of 490 mm × 330 mm × 300 mm) and has a mesh structure only on the bottom surface 2. The four side walls of the plastic container 3 have no ventilation holes and cannot be ventilated, and only the mesh structure portion of the bottom surface 2 can be ventilated. The mesh diameter of the bottom surface 2 should be a diameter that grains cannot pass through. As a result, the side walls on all four sides cannot be ventilated, and only the bottom surface 2 is in a state where grains do not leak but hot air can be ventilated, which is a miniature version of a so-called flat dryer. The container box 3 can store 10 to 15 kg of grains (paddy). The grain may be stored in a loose shape in the container box 3, or the grain may be stored in a net bag for immersion in advance. A plurality of the container boxes 3 can be stacked in a multi-stage manner. When the container boxes 3 are stacked in multiple stages and dried, the grain layer is formed thick when viewed as a whole, so that there is a concern that uneven drying may occur. However, since the purpose of the pre-drying apparatus 1 of the present embodiment is to overdry the seeds with extremely low water content up to about 7 to 10%, there is no need to worry about uneven drying. In particular, in the case of rice and rice, if the moisture is dried to an extremely low moisture range of about 7 to 10%, there is a concern that cracks will occur and the quality (grade) will deteriorate, but in the case of seed drying, cracks will occur. Since it has been proved that there is no problem in germination and growth of seeds even if they occur, it is not necessary to worry about the occurrence of trunk cracks due to overdrying.

The container base 4 (see FIG. 7) is capable of mounting the container box 3, and its shape is a polygon such as a circle or a square having a diameter or a side of about 1 m, and has a height. Is formed of a columnar or polygonal columnar box of about 0.5 m. The container base 4 has a hollow inside and is formed in a chamber for collecting dry air. Then, the upper surface of the container base 4 is opened to form an opening 4c, and when the container box 3 is placed, dry air can be ventilated from the container base 4 toward the container box 3. Reinforcing beams 4d and 4e are provided in the opening 4c of the container base 4 so that the container box 3 can withstand the weight when the container box 3 is placed. In the embodiment of FIG. 7, the reinforcing beams 4d and 4e are provided so as to cross the opening 4c in a cross shape. As a result, the opening 4c can be divided into a plurality of opening sections 4h to 4k (FIG. 7), and a plurality of container boxes 3 can be placed. A ventilation port 4f for supplying hot air is provided on the side wall of the container base 4, and a duct 4g is attached to the ventilation port 4f. One end of the flexible duct 6 will be attached to the duct 4g. Further, in order to control the amount of ventilation into the container box 3, the duct 4g may be provided with a shutter 7 (see FIGS. 1, 4, and 7) capable of adjusting the opening degree of the ventilation port 4f. Then, a plurality of container bases 4 may be provided as shown in FIG.

The hot air generator 5 houses a hot air generator composed of a kerosene burner, an electric heater, and the like and a blower for supplying hot air in a box-shaped housing 8 (neither is shown). A control panel 9 (see FIGS. 2 and 3) for controlling the temperature of the hot air generator and the air volume of the blower is provided.
The control panel 9 has a hot air generator start switch 10 (see FIG. 3) capable of turning the hot air generator on and off and a blower start switch 11 (see FIG. 3) capable of turning the blower on and off. ) And are provided. Further, the control panel 9 is provided with a control means (not shown) for setting the hot air temperature generated by the hot air generator and a temperature display unit 12 (see FIG. 3) for temperature monitoring, and the blower A control means (not shown) for setting the air volume of the generated dry air and an air volume display unit 13 (see FIG. 3) for monitoring the air volume are provided. As the temperature display unit 12, it is preferable to provide a target temperature display unit 14 and a current temperature display unit 15 (see FIG. 3).
The housing 8 of the hot air generator 5 is provided with a discharge port 5a (see FIG. 7) for discharging the hot air generated by the hot air generator and the blower, and a duct 5b is attached to the discharge port 5a. The other end of the flexible duct 6 is attached to the duct 5b.

The flexible duct 6 connecting the hot air generator 5 and the container base 4 may be formed by forming a flexible and airtight cloth-like material into a tubular shape. As the material, a synthetic resin sheet (blue sheet material, turf material) such as polyethylene is preferable, and a material called tarpaulin, which is made by applying tar to canvas to make it waterproof, is preferable. In addition, a vinyl material in which polyester fibers are wrapped in a synthetic resin film may be used. When such a flexible air-tight sheet material is used, it does not become bulky during storage. Moreover, even if a plurality of container bases 4 are provided as shown in FIG. 7, duct piping can be easily added, and the degree of freedom is excellent. For example, in the embodiment of FIG. 7, the main pipe 6a of the flexible duct 6 is extended and a branch pipe 6c of the flexible duct 6 is newly connected as compared with the embodiment of FIG.

Hereinafter, the operation of the pre-drying device 1 having the above configuration will be described with reference to the flow of FIG.
First, it is assumed that 10 to 15 kg of grains (paddy) are stored in one container box 3. For example, if about 300 kg of paddy to be pre-dried for hot water disinfection is secured, it is necessary to prepare 20 to 30 container boxes 3. Since approximately 16 container boxes 3 can be placed on one container base 4 (see FIG. 1), for example, if the number of container boxes 3 is 24, two container bases 4 (see FIG. 1) (See Fig. 7) needs to be prepared. The worker may install it appropriately according to the amount of paddy to be pre-dried. In the case of the two container bases 4 shown in FIG. 7, the flexible duct 6 is formed by the main pipe 6a and the branch pipes 6b and 6c, and the flexible duct 6 forms the duct 5b of the hot air generator 5 and the duct of the container base 4. Connect with 4g. Then, the moisture content of the raw material is measured in advance for each container box 3 with a moisture meter on hand, and the weight of the raw material is measured with a measuring instrument (step 1 in FIG. 8).
Next, the container box 3 is placed in the opening 4c of the container base 4, and a plurality of container boxes 3 are stacked in a multi-stage shape (for example, four-stage stacking) to prepare for drying (step S2 in FIG. 8). ..

Then, the hot air generator start switch 10 and the blower start switch 11 of the control panel 9 are activated to start drying the paddy (step S3 in FIG. 8). At this time, the temperature of the hot air generated by the hot air generator is maintained in the range of 40 to 50 ° C., and the amount of air generated by the blower is maintained at 15 m ³ / min. That is, unlike rice and rice, the purpose can be achieved by overdrying the water content of the seeds to an extremely low water content of about 7 to 10% without worrying about cracking.

The pre-drying device 1 is preferably controlled by a manual timer operation (manually stopping the drying device after a certain period of time) so as to configure the drying device at an extremely low cost. That is, a commercially available timer or stopwatch is used to measure whether or not a predetermined drying time has elapsed, and when the predetermined drying time elapses, the drying device is stopped (step S3 in FIG. 8). This drying time may be appropriately set according to the situation such as the moisture value of the raw material, but a guideline for the drying time in the present embodiment was obtained. Then, when the container boxes 3 are stacked in one layer, the moisture content of the paddy before drying is 13.9 to 14.3%, but the moisture content of the paddy after drying is 8.3 to 8.9%. A drying time of about 4 hours was required. Similarly, when the container boxes 3 are stacked in two layers, the moisture content of the paddy before drying is 13.9 to 14.3%, but the moisture content of the paddy after drying is 8.3 to 8.9%. A drying time of about 8 hours was required. Similarly, when the container boxes 3 are stacked in three layers, the moisture content of the paddy before drying is 13.9 to 14.3%, but the moisture content of the paddy after drying is 8.9 to 8.9%. A drying time of about 12 hours was required. Similarly, when the container boxes 3 are stacked in four layers, the moisture content of the paddy before drying is 13.9 to 14.3%, but the moisture content of the paddy after drying is 8.9 to 8.9%. A drying time of about 16 hours was required. That is, it was found that a drying time of about 4 hours was required for each stacking. In addition, taking advantage of the fact that drying is completed in about 4 hours for one-tiered containers, the one-tiered container box 3 is taken out of the machine every four hours, like a toy "Dharma doll drop". By transferring the stacked container boxes 3 to the first stage and the container box 3 containing new undried paddy to the uppermost stage, the drying operation can be continuously performed.

また、重量・水分換算表（重量・水分早見表）を作成すると図９のようになる。 Next, in order to confirm whether or not the drying is properly performed and the subsequent drying operation can be completed, the weight of the uppermost container box 3 after drying is measured (step S5 in FIG. 8). From the results of weight measurement before and after drying, the approximate moisture value after drying can be obtained by the following formula.

Further, when a weight / moisture conversion table (weight / moisture quick reference table) is created, it becomes as shown in FIG.

Then, it is verified whether or not the moisture value measured in step S5 of FIG. 8 is the target moisture value (step S6 of FIG. 8). If the measured moisture value reaches the target moisture value in step S6, the drying is completed (step S7 in FIG. 8), and if the measured moisture value does not reach the target moisture value, the process returns and the drying is performed again. Become.

As described above, according to the first embodiment of the present invention, the upper surface of the container base is opened so that a container box having a mesh structure on the bottom surface can be placed, and one end of the flexible duct is connected to the hot air generator. It is a pre-drying device in a hot water disinfection facility in which a discharge portion is connected to a ventilation port of the container base, and the upper surface of the opening of the container base is divided into a plurality of opening sections so that a plurality of container boxes can be placed. Therefore, even if only a small amount of paddy to be pre-dried before hot water disinfection is secured (for example, 300 kg to 400 kg), dozens of the above-mentioned ventilable container boxes 3 are prepared and 10 to 15 kg. Since it can be divided and stored in small pieces and placed on a container base for drying, it can be adjusted according to the amount of paddy, and the water content of the paddy can be dried within the range of 7 to 10%. It has become possible to provide a low-priced pre-drying device.

[Second Embodiment]
A second embodiment for carrying out the present invention will be described with reference to the drawings. FIG. 10 is a schematic vertical sectional view of a pre-drying device showing a second embodiment of the present invention. In the pre-drying device 101 of the second embodiment, the grain can be dried while being put in the net bag for dipping, and the pre-drying device 101 is in the housing 102 and the housing 102. A shelf board 103 having a ventilation structure arranged in a multi-stage manner, a hot air generator 104 and a blower 105 arranged outside the housing 102, a circulating air passage 106 that circulates and reuses the exhaust air after drying, and after drying. It is composed of an exhaust passage 107 that exhausts a part of the exhaust air to the outside of the machine. Reference numeral 108 is an air intake for circulation. According to this configuration, when the paddy M still contained in the net bag for immersion is placed on the shelf plate 103 and the hot air generator 104 and the blower are driven, hot air is supplied from below, so-called. It can be dried in the same way as a multi-stage dryer. Even in the multi-stage dryer of the second embodiment, a relatively inexpensive pre-drying device capable of handling a small amount of paddy and drying the moisture content of the paddy up to 7 to 10% is provided. Is possible.

Although some embodiments of the present invention have been described above, the above-described embodiments of the present invention are for facilitating the understanding of the present invention and do not limit the present invention. The present invention can be modified and improved without departing from the spirit thereof, and the present invention includes equivalents thereof. Further, in the range where at least a part of the above-mentioned problems can be solved, or in the range where at least a part of the effect is exhibited, the scope of claims and the combination of each component described in the specification can be combined or omitted. ..

The present invention is useful as a pre-drying device in a hot water disinfection facility for disinfecting paddy rice seeds (seed paddy) with hot water.

1 Pre-drying device 2 Bottom 3 Container box 4 Container base 5 Hot air generator 6 Flexible duct 7 Shutter 8 Housing 9 Control panel 10 Hot air generator start switch 11 Blower start switch 12 Temperature display 13 Air volume display 14 Target temperature display 15 Current temperature display 101 Pre-drying device 102 Housing 103 Shelf board 104 Hot air generator 105 Blower 106 Circulation air passage 107 Exhaust air passage 108 Air intake

Claims (5)

A container box having a mesh structure on the bottom surface to accommodate grains, a container base on which the container box can be placed and the upper surface is opened to allow ventilation to the container box, and a container base for generating hot air. A pre-drying device in a hot water disinfection facility equipped with a hot air generator and a flexible duct having one end connected to the hot air generator and the other end connected to a ventilation port of the container base.
A pre-drying device in a hot water disinfection facility, wherein the upper surface of the opening of the container base is divided into a plurality of opening sections so that a plurality of container boxes can be placed. The advance in the hot water disinfection facility according to claim 1, wherein a plurality of the container bases are installed, and the plurality of container bases and the hot air generator are connected by a flexible duct formed by a main pipe and a branch pipe. Drying device. The advance in the hot water disinfection facility according to claim 1 or 2, wherein a duct for connecting the flexible duct is attached to the container-based ventilation port, and a shutter for controlling the amount of hot air is provided in the duct. Drying device. The pre-drying device in the hot water disinfection facility according to any one of claims 1 to 3, wherein the container boxes are stacked and placed in a plurality of stages on the container base. When a predetermined time has passed from the start of drying, the dried container boxes at the bottom of the container base are sequentially taken out of the machine, while new undried paddy is stored at the top of the container base. The pre-drying device in the hot water disinfection facility according to claim 4, wherein a drying method such as placing a container box and restarting drying is carried out.

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