JP2011045303A - Insecticidal-ovicidal apparatus for grains - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an insecticidal-ovicidal apparatus 1 enabling continuous treatment of grains without drying by uniformly heating the grains by microwave irradiation. <P>SOLUTION: The insecticidal-ovicidal apparatus 1 is vertically installed to descend the grains introduced from an upper end through the inside of the apparatus and includes a pipe 4 transmitting microwaves, a speed controlling mechanism 8 placed at a lower end of the pipe 4 and controlling the descending speed of the grains, a microwave transmission circuit 6 to transmit the microwave generated by a microwave generator 5, and an applicator 3 to irradiate a side face of the pipe 4 with the microwave transmitted through the microwave transmission circuit 6. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an insecticidal and ovicidal device for cereals that exterminates pests mixed in cereals such as polished rice.

Methyl bromide (CH ₃ Br), which has been adopted as a pest control in stored cereals, has been designated as an ozone-depleting substance, although it has a high insecticidal effect, and its use is currently prohibited. For this reason, as a pest control alternative to methyl bromide, the stored cereal is put into a vacuum container, and after evacuating, carbon dioxide is introduced to a high pressure so that the pests mixed in the cereal absorb carbon dioxide. A method for inactivating or killing pests has been proposed (see, for example, Patent Document 1).

  In addition, pest control using microwaves has been proposed as a pest control alternative to methyl bromide. For example, as an insecticidal and egg-killing treatment method for dried vegetables, an apparatus for performing insecticidal and egg-killing of pests by performing microwave heat treatment and hot air heat treatment on a belt conveyor has been proposed (see Patent Document 2).

  In addition, as a method for controlling pests in stored cereals using microwaves, a pest control method characterized by irradiating microwaves on grains containing pests and drying them to such an extent that the grain structure is not impaired is proposed. (See Patent Document 3).

JP-A-8-242830 JP-A-56-29942 Japanese Patent Laid-Open No. 51-85978

  In the so-called high-pressure carbon dioxide method in which the carbon dioxide gas is introduced to a high pressure, the high pressure reaches 30 atm (3 MPa) or more, so that a robust pressure-resistant vessel is required, and the apparatus becomes large-scale. Therefore, it is difficult to easily improve the processing capacity. Furthermore, there are cases in which the insect pests laid inside the polished rice cannot be controlled.

  On the other hand, in pest control using microwaves, the inside of cereals is heated, so it is considered possible to control the eggs of pests laid in the polished rice. However, in the insecticide / eggicide treatment method for dried vegetables of Patent Document 2, the thickness tends to vary due to the continuous treatment method employing a belt conveyor, and it tends to be heated unevenly by microwave irradiation from one side. Since there is difficulty in uniform heating of objects, a hot air drying process is adopted. That is, first, hot air drying is performed, the pests on the surface of the object to be processed are moved to the deep side where the temperature is low, and the pests that have moved to the deep part are exterminated by internal heating using microwaves. However, in the hot air drying process, it took more time to heat the object to be processed than in the microwave irradiation process, and it was difficult to improve the processing capability.

Moreover, in the control method of the pest of the grain of patent document 3, the insecticidal and egg-killing effect is acquired by making it dry after microwave irradiation. In the case of polished rice, it is required to carry out insecticidal / ovicidal treatment immediately before storage, particularly immediately before storage, but the processed polished rice (milled rice) is already water-adjusted and dried by microwave treatment. Since the progress of torso will cause torso cracking, it must be suppressed.
From the above, microwave irradiation is effective for controlling the eggs of pests, but it is impossible to uniformly heat the processed object (cereals) while continuously processing it, and the processing ability cannot be improved. It was. Moreover, the drying accompanying heating had to be suppressed.

  Therefore, an object of the present invention is to provide an insecticidal / eggicide that can be continuously processed without drying while irradiating cereals with microwaves and heating uniformly.

The present invention, a cereal introduced from the upper end is erected so as to descend inside, a pipe that transmits microwaves,
A speed adjusting mechanism that is disposed at a lower end of the pipe and adjusts a descending speed of the cereal;
A waveguide for transmitting the microwave generated by the magnetron;
It is a cereal insecticidal and ovicidal device having an applicator for irradiating the microwave transmitted from the waveguide toward the side surface of the pipe.

  ADVANTAGE OF THE INVENTION According to this invention, the insecticidal and egg-killing apparatus which can be continuously processed, without drying, irradiating a grain with microwaves and heating uniformly can be provided.

1 is a configuration diagram of a cereal insecticidal / eggicide apparatus according to an embodiment of the present invention. It is a perspective view of a microwave irradiation room to which a microwave generator (magnetron) and a microwave transmission circuit (waveguide) are connected. It is arrow sectional drawing of the AA direction of FIG. 2A. It is the perspective view which permeate | transmitted the mode of the microwave irradiation chamber periphery of the state where the polished rice was thrown into the pipe from upper direction to the downward direction. (A) is an electric field distribution diagram on a plane including the central axis of the microwave transmission circuits (waveguides) 6a and 6c, and (b) is a common central axis of the microwave irradiation chamber (applicator) and the pipe. And (c) is an electric field distribution diagram on a plane that includes the central axes of the microwave transmission circuits 6b and 6d. FIG. 4 is an electric field distribution diagram on a plane including a common central axis of the microwave irradiation chamber and the pipe, and in which the central axis of the microwave transmission circuit and its normal line are parallel to each other. It is a table | surface which shows the relationship between the temperature of polished rice, and the retention time of the temperature of the insecticidal / eggicide of polished rice.

  Next, embodiments of the present invention will be described in detail with reference to the drawings as appropriate.

  FIG. 1 shows a block diagram of a cereal insecticidal / eggicide apparatus 1 according to an embodiment of the present invention. The insecticidal / eggicide apparatus 1 can be applied to cereals in general, for example, rice, soybeans, red beans, corn, wheat, and the like. In the embodiment, particularly polished rice will be described as an example.

  The insecticidal / eggicide apparatus 1 has a unit part 2. By arranging a plurality of unit parts 2 in parallel (N unitization), the processing capability can be easily multiplied by N times.

  Each unit 2 includes a pipe 4 through which polished rice continuously passes, a microwave irradiation chamber (applicator) 3 that covers the pipe 4, and a plurality of microwave generators (magnetrons) 5 that generate microwaves ( 5a, 5b), a plurality of microwave transmission circuits (waveguides) 6 (6a, 6b) that transmit the generated microwaves to the applicator 3, and the polished rice that has been heated by the microwaves and has come out of the pipe 4 A rice temperature detecting device 7 for detecting the temperature and a discharge mechanism 8 for continuously discharging the polished rice from the pipe 4 are provided. As the frequency of the microwave, 2.45 GHz can be used.

  The pipe 4 is erected in the vertical direction so that the polished rice introduced from the upper end descends inside. The pipe 4 is made of a material that transmits microwaves, such as Teflon (registered trademark) or quartz.

  As the rice temperature detecting device 7, since the surface temperature of rice and the internal temperature are substantially equal, an infrared thermometer for detecting the surface temperature of rice can be used. Moreover, if it is the outer side of the applicator 3, a thermocouple etc. can also be used.

  The discharge mechanism 8 is disposed on the lower end side of the pipe 4 and functions as a speed adjustment mechanism that adjusts the descent speed (discharge speed) of the polished rice descending the pipe 4. This descending speed is set to be smaller than the free fall speed of the polished rice. During the processing, the polished rice is lowered at the descending speed, but the height at which the microwave of the pipe 4 is irradiated by the supply from above. The state filled up to the above is maintained. A rotary valve or the like can be used as the discharge mechanism 8 (speed adjustment mechanism).

  A plurality of microwave transmission circuits (waveguides) 6 (6a, 6b) are connected to the applicator 3, and the microwaves transmitted from the microwave transmission circuits (waveguides) 6 (6a, 6b) are piped. Irradiate toward the side of 4. The microwave irradiated toward the pipe 4 passes through the pipe 4, is absorbed by the polished rice filled in the pipe 4, and the polished rice is heated and heated. Since the polished rice is filled along the inner shape of the pipe 4, an equal amount of the polished rice is always heated and can be heated uniformly in the descending direction. Moreover, since the directions connected to the applicator 3 of the plurality of microwave transmission circuits (waveguides) 6 (6a, 6b) are different from each other, the pipe 4 is irradiated with microwaves from a plurality of directions. This also makes it possible to heat the polished rice uniformly with respect to the vertical direction of the descending direction. On the other hand, even if the pipe 4 transmits microwaves but does not transmit water vapor, even if water vapor comes out from the heated polished rice, the water remains in the atmosphere around the polished rice, so that drying is promoted. However, it is absorbed again in the polished rice and the moisture inside the polished rice is maintained.

  And if the descent speed is slowed, the irradiation time of the microwave to the polished rice can be made substantially longer and the heating time can be extended, so that the temperature of the polished rice can be raised. On the contrary, if the descent speed is increased, the irradiation time of the microwave to the polished rice can be shortened and the heating time can be shortened, so that the temperature of the polished rice can be lowered as compared with the case where the descent speed is slow. The temperature of cereals capable of killing and killing pests in general cereals including polished rice is within the temperature range of 60 to 80 ° C. as will be described in detail later, so the rate of descent is discharged so as to be within this temperature range. Adjustment is made by the mechanism 8. This adjustment may be performed by feedback control by the central controller 9. First, the central controller 9 stores a target temperature in a temperature range of 60 to 80 ° C. in advance. The central controller 9 acquires the temperature of the polished rice detected by the rice temperature detector 7. The central controller 9 performs PID control, etc., and determines the lowering speed of the discharging mechanism 8 (rotational speed if it is a rotary valve) so that the detected temperature of the polished rice matches the target temperature. The discharge mechanism 8 is controlled so that the speed is reached. In order to adjust the temperature of the polished rice, not only the lowering speed of the discharge mechanism 8 but also the microwave output of the microwave generator (magnetron) 5 (5a, 5b) may be adjusted. These may be adjusted together. Incidentally, it is preferable that the rice input mechanism 11 can also adjust the input speed actively or passively according to the change in the discharge speed of the discharge mechanism 8. As the rice charging mechanism 11, a fixed supply hopper or the like can be used.

  In the front stage of the unit unit 2, a rice charging mechanism 11 and a preheating device 12 for supplying the polished rice to the preheating device 12 and further to the unit unit 2 are provided. The preheating device 12 is used to keep the temperature of the polished rice put into the unit part 2, particularly the pipe 4, constant, and the temperature of the polished rice is set to 60 before the polished rice is introduced into the pipe 4. The temperature is raised within a range of 50 ° C. or lower which is lower than the temperature range of ˜80 ° C. Specifically, it is used when the temperature difference between days or the temperature difference between years is large. For example, even if the temperature difference of the year is large and the temperature of milled rice rises to a temperature range of 60 to 80 ° C. due to microwave irradiation in the summer, the temperature range in the microwave irradiation in the winter is similar to that in the summer. Therefore, the temperature of the microwave generator (magnetron) 5 must be increased or the lowering speed of the discharge mechanism 8 must be decreased. According to the preheating device 12, the fluctuation range of the temperature of the polished rice put into the pipe 4 can be reduced.

  In the subsequent stage of the unit unit 2, there are a surface reforming device 13, a storage temperature adjustment mechanism (sealed container) 14, a meter 15, and a discharge mechanism 16 for discharging the polished rice to the storage.

  The surface reforming device 13 is a high-temperature steam spraying device that blows steam at a temperature equal to or higher than the surface temperature of the polished rice detected by the rice temperature detection device 7 after the polished rice has passed through the discharge mechanism 8 from the pipe 4. Have. Microwave-heated polished rice is sent from the discharge mechanism 8 to the surface reforming device 13. By blowing high-temperature steam onto the heated polished rice, the polished rice is cracked and barreled. Without cracking, it is possible to modify the surface of the polished rice surface to make it glossy and glossy. The surface reforming device 13 is not an essential device for the insecticidal / ovicidal device 1, but has proposed an added-value function that allows the surface modification to be easily performed by utilizing the high temperature of the polished rice. Is. Therefore, if the surface modification is unnecessary, the surface modification apparatus 13 can be omitted as a matter of course.

  The storage temperature adjustment mechanism (sealed container) 14 seals the polished rice until the temperature of the polished rice drops to a predetermined temperature of 40 ° C. or less after the polished rice passes the discharge mechanism 8 and the surface reforming device 13 from the pipe 4. To do. The polished rice sent from the discharge mechanism 8 and the surface modification device 13 is heated to 60 ° C. or higher. If left in the atmosphere in this state, drying of the polished rice is promoted, and cracks and shell cracks occur. In order to prevent this, the polished rice is naturally stored at a temperature that can be stored at 40 ° C. or lower while the polished rice is sealed in the storage temperature adjusting mechanism (sealed container) 14 so that moisture from the polished rice does not escape into the atmosphere. Cooling. The water evaporated from the polished rice by this cooling returns to the polished rice again, and the evaporation itself from the polished rice can be suppressed. If the surface is left wet, it will cause mold, so moisture management is performed without leaving excess moisture.

  The measuring device 15 measures the polished rice naturally cooled to 40 ° C. or lower. Thereby, the polished rice conveyed through the discharge mechanism 16 to the storage (not shown) can be accurately measured.

  FIG. 2A shows a perspective view of the microwave irradiation chamber (applicator) 3. The applicator 3 includes a plurality (four in FIG. 2A) of microwave generators (magnetrons) 5 (5a to 5d) and a plurality of (four in FIG. 2A) microwave transmission circuits (waveguides) 6 ( 6a-6d) are connected.

  The applicator 3 is made of metal and has a rectangular parallelepiped shape. For example, the size can be 299 mm × 214 mm × 1000 mmh. The basic structure of the applicator 3 is a box shape, and the applicator 3 includes an upper lid 3a, a cylinder 3b, and a bottom lid 3c. In the center of the upper lid 3a, there is provided an inlet 17 into which polished rice is introduced. The outer shape of the upper lid 3a and the shape of the insertion port 17 are rectangular (rectangular). The input port 17 is provided with a metal mesh so that microwaves do not leak from this portion. The mesh size of the metal mesh can be set to about 5 mm □ through which rice grains can easily pass.

  Note that coordinates are set in order to facilitate understanding of the structure. The coordinate origin is set at the center of the upper lid 3a. The X axis is set parallel to the direction of the long side of the rectangle of the upper lid 3a. The Z axis is set parallel to the direction of the short side of the rectangle of the upper lid 3a. The Y axis is set parallel to the direction of the normal line of the upper lid 3a. Note that the outer shape of the upper lid 3a and the shape of the insertion port 17 may be rectangular, not limited to a rectangle, and may be a square. The outer shape of the bottom lid 3c is substantially the same as the outer shape of the upper lid 3a.

  Both the outer peripheral shape and inner peripheral shape of the cross section perpendicular to the axial direction of the cylinder 3b of the applicator 3 are rectangular (rectangular). A plurality of waveguides 6 (6a to 6d) are arranged on each of the side surfaces (XY plane) constituting two opposing sides (corresponding to the long sides) of the rectangle (rectangle). When viewed from above to below the applicator 3, the direction in which the waveguides 6a and 6c are connected to the applicator 3 is the direction in which the waveguides 6b and 6d are connected to the applicator 3. Is different. This makes it possible to uniformly heat polished rice.

  Further, the heights (height positions) of the waveguides 6 (6a to 6d) connected to the applicator 3 are different from each other. Specifically, the waveguide 6a is the highest, the waveguide 6b is the next highest, the waveguide 6c is the third highest, and the waveguide 6d is the lowest. By changing the height, the magnetrons 5 (5a to 5d) connected to the waveguides 6 (6a to 6d) are prevented from interfering with each other.

  Each of the plurality of waveguides 6 (6 a to 6 d) is connected to the cylinder 3 b of the applicator 3 via a joint plate 18. Although the joint plate 18 will be described later, it is used to change the connection position in the X-axis direction without changing the height of the waveguide 6 (6a to 6d). Specifically, the waveguide 6 (6a to 6d) is disposed from the left side of the XY plane toward the XY plane. That is, the center axis of the waveguide 6 (6a, 6c) is, for example, 52 mm away from the center line in the Y axis direction of the XY plane in the negative direction of the X axis, and the waveguide 6 (6b, 6d). The central axis is, for example, 52 mm away from the center line in the Y-axis direction of the XY plane in the positive direction of the X-axis. By adjusting the separation distance of 52 mm, the polished rice can be heated more uniformly.

  FIG. 2B shows a cross-sectional view taken along the line AA in FIG. 2A. The applicator 3 stores a pipe 4. The pipe 4 is substantially symmetric with respect to the cut surface, and the size of the pipe 4 can be, for example, an inner dimension of 155 mm × 70 mm × 1000 mmh. And if the descending speed | rate of milled rice shall be 1000 mm / min, processing capacity will be about 556 kg / hr per one unit part 2. FIG. Both the inner peripheral shape and the outer peripheral shape of the cross section perpendicular to the axial direction (vertical direction) of the pipe 4 are rectangular (rectangular). The open end 6A of the waveguide 6 (6a, 6c) is arranged toward one side surface constituting two opposite sides of the rectangle (rectangle). Although not shown, the open end 6A of the waveguide 6 (6b, 6d) is opposed to the other one side surface that constitutes the two opposite sides. The height (height position) of the opening end 6A is different for each of the waveguides 6a and 6c. Note that the space surrounded by the side surface of the pipe 4 and the applicator 3 and the space in the waveguide 6 are closed spaces, and dust or the like does not enter from the outside. Therefore, the microwave generator 5 is not exposed to dust or the like. For this reason, also about cleaning, this insecticidal and egg-killing apparatus 1 can be kept hygienic by cleaning the inside of the pipe 4 in contact with the polished rice. The cleaning of the inner wall of the pipe 4 is easy because the structure is simple.

  The pipe 4 is open at the top and bottom. An inlet 17 is provided at the upper opening of the pipe 4, and an outlet 19 is provided at the lower end of the pipe 4. The discharge port 19 is provided with the same metal mesh as the input port 17. The polished rice is introduced from the inlet 17, descends the pipe 4 from the upper end to the lower end, and is discharged from the outlet 19. The polished rice absorbs the microwave radiated from the open end 6A of the waveguide 6 (6a, 6c) while passing through the pipe 4, and heated and heated.

  The pipe 4 is disposed in the center of the applicator 3 as seen through from above. The upper and lower ends of the pipe 4 are supported by support portions 21 fixed to the upper lid 3a and the bottom lid 3c of the applicator 3, respectively. The side surface of the pipe 4 is supported from the cylinder 3 b of the applicator 3 via the spacer 22. The open end 6 </ b> A of the waveguide 6 (6 a, 6 c) connected to the applicator 3 by the spacer 22 is arranged away from the side surface of the opposing pipe 4. By separating in this way, it is possible to irradiate the pipe 4 with the microwave radiated from the open end 6A of the waveguide 6 (6a, 6c), so that the intensity of the microwave in the pipe 4 is made uniform. The polished rice can be heated uniformly.

  FIG. 3 shows a state where the periphery of the applicator 3 in a state where the polished rice 23 is put into the pipe 4 is seen through from above. The polished rice 23 is filled in a shape along the inner wall of the pipe 4 while descending the pipe 4. For this reason, the thickness of the polished rice in the Z-axis direction is equal to the length of the short side of the rectangular inner shape of the pipe 4 (the distance between the long sides facing each other), and is always constant. The width of the polished rice in the X-axis direction is equal to the length of the long side of the inner shape of the pipe 4 and is always constant. The density of the polished rice in the pipe 4 is always constant according to the height. If a certain microwave is irradiated here, even if the polished rice falls and the polished rice is replaced every moment, it can be heated uniformly at all times. Also, the heated polished rice fills every corner of the pipe 4 and is surrounded by the pipe 4 on all sides, so there is no extra space and the steam generated from the polished rice is scattered and dried. There is no. Even if the steam rises upward, it is condensed and adsorbed on the unheated polished rice in the pipe 4 and the moisture does not escape to the outside. By confining the steam, heating is also efficiently promoted by the heat of the steam.

  Further, the thickness of the polished rice in the Z-axis direction is set to approximately twice the half power depth of the microwave of polished rice as a bulk. The thickness of the polished rice in the Z-axis direction is equal to the length of the short side of the rectangular inner shape of the pipe 4 (distance between the long sides facing each other), and is set to 70 mm, for example. This is based on the fact that the half depth of the microwave power of the polished rice was about 35 mm based on the result of the experiment at 2.45 GHz. That is, 70 mm (35 mm × 2 = 70 mm), which is twice the half depth (35 mm) of the microwave power of polished rice, is set as the thickness of the polished rice in the Z-axis direction. According to this, when microwaves are irradiated with the same intensity from both sides in the Z-axis direction, the electric field distribution of microwaves in the Z direction (thickness direction of polished rice) in the range where polished rice is distributed is substantially uniform. can do. And the polished rice can be heated and heated uniformly even in the thickness direction.

  Further, when seen through from above, the waveguide 6 connected to the applicator 3 from the Z-axis (a common normal passing through the centers of two opposite sides (long sides) of the rectangular shape of the inner side of the pipe 4). The center lines in the vertical direction of the open ends 6A of (6a, 6b) are spaced apart from each other by the intervals Da, Db. If the distances Da and Db are zero, the heating temperature at the center of zero in the X coordinate becomes high. Therefore, in order to uniformly heat, that is, uniformly irradiate, the interval Da is provided in the negative direction of the X axis, the interval Db is provided in the positive direction of the X axis, and is removed from the center in the ± direction. The distances Da and Db can be set to 52 mm, for example. In addition, it is thought that optimal space | interval Da and Db are fluctuate | varied with the shape of the applicator 3, the pipe 4, the waveguide 6, and the kind of grain. Therefore, a joint plate 18 is provided to easily adjust the distances Da and Db. That is, the waveguides 6 (6a, 6b) are connected in accordance with the opening of the joint plate 18, and the distances Da, Db can be easily adjusted by replacing the joint plate 18 with a different opening position. . The cylinder 3b of the applicator 3 is provided with a large opening so that the opening end 6A is secured even if the position of the opening of the joint plate 18 changes.

  In FIG. 4, the simulation result of the electric field distribution of the microwave of the applicator 3 and the pipe 4 is shown. It is assumed that the milled rice 23 is filled in the pipe 4. Further, the relative permittivity of polished rice as a bulk: r is 60 (r = 60), and the dielectric loss tangent tan δ is 0.1 (tan δ = 0.1). FIG. 4A is an electric field distribution diagram on a plane including the central axes of the waveguides 6a and 6c. The shaded area indicates the strong electric field region 24. From this, it can be seen that the strong electric field region 24 is distributed substantially uniformly from the upper end to the lower end of the pipe 4. When the polished rice descends from the upper end to the lower end of the pipe 4, the temperature can be raised smoothly. FIG. 4B is an electric field distribution diagram on a plane including the Y axis (the central axis of the pipe 4) and the Z axis. Also here, the strong electric field region 24 is distributed substantially uniformly from the upper end to the lower end of the pipe 4, and when the polished rice falls from the upper end to the lower end of the pipe 4, the temperature can be raised smoothly. FIG. 4C is an electric field distribution diagram on a plane including the central axes of the waveguides 6b and 6d. Also here, the strong electric field region 24 is distributed substantially uniformly from the upper end to the lower end of the pipe 4, and when the polished rice falls from the upper end to the lower end of the pipe 4, the temperature can be raised smoothly. FIG. 4D is an electric field distribution diagram on a plane including the Y axis (the central axis of the pipe 4) and the X axis. Also here, the strong electric field region 24 is distributed substantially uniformly from the upper end to the lower end of the pipe 4, and when the polished rice falls from the upper end to the lower end of the pipe 4, the temperature can be raised smoothly. Since the polished rice passes through the strong electric field region 24 to the same extent no matter where it descends on the pipe 4, the polished rice heated to a uniform temperature can be discharged at the lower end of the pipe 4. And insect pests can be killed and killed without omission.

  FIG. 5 shows the relationship between the temperature of polished rice and the retention time of the temperature in the insecticidal / eggicide of polished rice. This relationship is obtained by a smaller apparatus (batch type) than the insecticidal / eggicide apparatus 1 (see FIG. 1) of the embodiment. The temperature of the polished rice was tested from 45 ° C to 75 ° C every 5 ° C. When the temperature of the polished rice was 80 ° C. or higher, cracks were generated in the polished rice and the taste was impaired. The arrival time indicates the time required to reach the temperature of each polished rice. Since the microwave power is constant, the higher the temperature of the polished rice, the longer the arrival time. The holding time is the time of holding the temperature of the polished rice after reaching the temperature of the polished rice. The weevil was used as the pest, and the presence or absence of the insecticidal effect was determined by visually deciding whether or not the adult larvae mixed with the polished rice were killed after heating the polished rice. Judgment of the effect of ovicidality is done by using polished rice on which the eggs of Oxalis elegans were laid, and by conducting a culture test on the polished rice after heating the polished rice, whether or not the adults of Oxalis are born It was done by judging.

  Accordingly, as shown in FIG. 5, when the temperature of the polished rice was 55 ° C. or less, the insecticidal / eggicide effects could not be obtained when the holding time was 6 seconds or less (×). When the temperature of the polished rice was 60 ° C. or higher, the retention time was 1 second or longer, and insecticidal / ovicidal effects were obtained (◯).

  For example, when the condition of the polished rice temperature of 60 ° C. and the holding time of 1 second is applied to the insecticidal / eggicide apparatus 1 (see FIG. 1) of the embodiment, the temperature of the polished rice is the highest temperature near the lower end of the pipe 4. At 60 ° C., insecticidal and egg-killing are performed, and immediately after (1 second), the pipe 4 is discharged and cooled.

  Further, when the condition of the polished rice temperature of 75 ° C. and the holding time of 1 second is applied to the insecticidal / ovicidal apparatus 1 (see FIG. 1) of the embodiment, the temperature of the polished rice is 60 ° C. near the middle of the pipe 4. After about 7.2 seconds (7.2 = 17.9 (arrival time at 75 ° C.)-10.7 (arrival time at 60 ° C.)), near the lower end of the pipe 4 Thus, the temperature of the polished rice reaches the maximum temperature of 75 ° C., and immediately after (one second later), it is discharged from the pipe 4 and cooled.

  In addition, from the test results of polished rice at 50 ° C and 55 ° C, even in the same holding time, even if there is an effect of ovulation (○), the effect of insecticidal effect is not obtained (×), and vice versa Was not seen. From this, in the case of microwave heating, since heat is generated from the inside of the polished rice, it can be understood that the insect eggs laid inside the rice grain are easier to control than the harmful insects mixed in the polished rice.

  In the present embodiment, the pipe 4 is illustrated as a square, but other cross-sectional shapes such as a circle may be used. There is no particular restriction on the place where the insecticidal / eggicide apparatus 1 is applied. For example, in a rice milling facility, the insecticidal / eggicide apparatus 1 is added to the milled rice that has been polished by a rice milling machine. It is put on the egg apparatus 1 and is killed by insects and eggs. This insect-killed and egg-killed polished rice will be distributed to the market.

DESCRIPTION OF SYMBOLS 1 Insecticide and egg-killing apparatus 2 Unit part 3 Microwave irradiation room 3a Top cover 3b Tube 3c Bottom cover 4 Pipe 5, 5a-5d Microwave generator (magnetron)
6, 6a-6d Microwave transmission circuit (waveguide)
6A Open end of waveguide 7 US temperature detector 8 Discharge mechanism (speed adjustment mechanism, rotary valve)
9 Central controller 11 Rice input mechanism 12 Preheating device 13 Surface reformer 14 Storage temperature adjustment mechanism (sealed container)
15 Weighing device 16 Discharge mechanism (to storage)
17 Input port 18 Joint plate 19 Discharge port 21 Support part 22 Spacer 23 Polished rice (cereals)
24 Strong electric field region

Claims (11)

Pipes that are introduced from the top end so as to descend inside, pipes that allow microwaves to pass through,
A speed adjusting mechanism that is disposed at a lower end of the pipe and adjusts a descending speed of the cereal;
A waveguide for transmitting the microwave generated by the magnetron;
A cereal insecticidal and ovicidal device comprising an applicator for irradiating the microwave transmitted from the waveguide toward a side surface of the pipe. A plurality of the waveguides are provided,
The pesticidal action of cereals according to claim 1, wherein when viewed in the direction from the upper end to the lower end of the pipe, the directions in which the plurality of waveguides are connected to the applicator are different from each other. Egg killing device. The inner peripheral shape of the cross section perpendicular to the axial direction of the pipe is substantially rectangular,
The cereal insecticidal and ovicidal device according to claim 1 or 2, wherein a plurality of the waveguides are arranged toward each of the side surfaces constituting two opposing sides of the rectangle. .   The pesticidal and ovicidal device for cereals according to claim 3, wherein the distance between the two opposing sides of the rectangle is approximately twice the half power of the microwave power of the cereal. .   The cereal according to any one of claims 1 to 4, wherein an open end of the waveguide connected to the applicator is away from the side surface of the pipe facing the applicator. Insecticidal and ovicidal equipment.   When viewed in the direction from the upper end to the lower end of the pipe, the upper and lower ends of the open end of the waveguide connected to the applicator from a common normal passing through the centers of the two opposite sides of the rectangle. The cereal insecticidal / eggicide apparatus according to any one of claims 1 to 4, wherein the direction center line is separated.   5. The height of the open end of the waveguide connected to the applicator is different for each of the plurality of waveguides. 6. Cereal insecticidal and ovicidal equipment. The cereal is polished rice,
The polished rice is heated by irradiating the polished rice with the microwave while lowering the inside of the pipe, and the surface temperature of the polished rice is maintained within a range of 60 to 80 ° C. for a predetermined time or more. The cereal insecticidal / eggicide apparatus according to any one of claims 1 to 5.   The cereal insecticidal / killing according to claim 8, further comprising a preheating device for raising the surface temperature of the polished rice within a range of 50 ° C or less before the cereal is introduced into the pipe. Egg equipment. The cereal is polished rice,
10. The high temperature steam spraying device according to claim 1, further comprising: a high-temperature steam spraying device that blows steam having a temperature equal to or higher than a surface temperature of the polished rice after the polished rice passes through the pipe. The insecticidal / ovicidal device for cereals according to item. The cereal is polished rice,
11. The sealed container according to claim 1, further comprising: a sealed container that seals the polished rice until the surface temperature of the polished rice decreases to a predetermined temperature or less after the polished rice passes through the pipe. A cereal insecticidal and ovicidal apparatus according to claim 1.

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