JPH0742939U - Microwave dry solid concentration / moisture meter - Google Patents

Abstract

(57) [Summary] [Purpose] Drying or drying of multiple samples can be performed at the same time, and the solid content should not be burnt out at the bottom of the pan. [Structure] A microwave applicator 10 is formed in a size that is not a strong electric field type, and a turntable 12 for setting, for example, 3 to 5 pans 18 into which a sample 5 is injected is arranged in the applicator 10. The tray 18 is made of a material having a high dielectric loss coefficient. According to this, the size of the applicator 10 is not limited, and a large number of saucers in which the same sample is injected can be dried at once. The sample 5 impregnated in the filter paper in the saucer 18 is dried at an appropriate temperature by both direct heating by the microwave in the oven-type applicator 10 and heating of the saucer 18 that is rapidly heated. To be done. Therefore, the solid content is not burned and the bottom of the filter paper is not condensed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a configuration of a microwave dry solid content / moisture meter which performs drying for measuring a sample by using a microwave in a short time.

[0002]

[Prior art]

 Compared with other heat sources that use far infrared rays, microwaves have the advantage of enabling faster heating and drying. Therefore, microwave drying is also used in conventional solid content meters. FIG. 3 shows a schematic configuration of a solid content concentration meter using this microwave. As shown in the figure, a mounting table 3 for mounting a sample tray 2 is arranged in an applicator 1 which is a drying chamber. To be done. The tray 2 is made of a heat-resistant glass material (Pyrex-trademark) and has a filter paper inside, and the applicator 1 is of a strong electric field type having a size of a waveguide. Then, the sample 5 is dropped from the quantifier 4 onto the tray 2, and the weight of the tray 2 is measured by the weight scale 6. Further, a magnetron 7 for outputting microwaves is arranged at the right end of the applicator 1 in the tray 2 and a short plunger 8 is attached at the left end.

According to such a configuration, by adjusting the position of the short plunger 8, the maximum point of the electric field in the applicator 1, that is, an odd number of (λg / 4) from the short plunger 8. The tray 2 is arranged at the double position. Therefore, the microwaves output from the magnetron 7 are concentrated and applied to the saucer 2, so that the saucer 2 and the sample 5 can be rapidly heated and heated, and the bottom of the saucer 2 and the sample 5 can be heated. Condensation does not occur with the filter paper containing 5 as well.

In the actual measurement, first, the tare weight of the tray 2 after drying is measured by the weight scale 6, and then the sample 5 is dropped from the quantifier 4 to the tray 2, and the tray 2 is initially opened in this state. Measured as weight. Then, the microwave is irradiated from the magnetron 7, and the sample 5 is dried in the tray 2. Finally, the final weight of the tray 2 is measured, and the weight of solid content or the water content is calculated from the final weight, the tare weight, and the initial weight. After the measurement is completed, the tray 2 is discharged, another tray 2 is supplied, and the same measurement is repeated. For example, the same sample (specimen) is measured 3 to 5 times.

[0005]

[Problems to be solved by the device]

 However, in the above-described conventional solid content densitometer, as described above, the solid content is measured for each of the trays, and there is a problem that the measurement takes time. This is because the size of the tray 2 is about 30 mm in diameter and about 6 mm in thickness, and the conventional applicator 1 is a waveguide type strong electric field type as described above. It is also due to the limitation of. That is, as shown in FIG. 3 (B) which is a cross-sectional view taken along the line BB of FIG. 3 (A), the applicator 1 on which the mounting table 3 is arranged has a size of a microwave having a frequency f = 2450 MHz. Therefore, the size must be smaller than the JIS standard WRJ2 (54.6 mm × 109.2 mm) of the waveguide. Therefore, it is difficult to arbitrarily increase the size of the applicator 1.

Further, in the strong electric field type applicator 1 as described above, the sample 5 in one tray 2 can be dried quickly and without causing dew condensation between the filter paper and the bottom. On the other hand, since the electric field strength of the microwave is high, there is a problem that the solid content of the sample 5 may cause burnout (overheating phenomenon) at the bottom of the pan 2 of the heat-resistant glass. Therefore, in this case, a burning error of the solid content causes a measurement error, and the scrubbing of the solid content makes the washing of the tray 2 complicated.

The present invention has been made in view of the above problems, and an object thereof is to perform dry baking or sample drying for a plurality of samples at the same time, and the solid content at the bottom of the saucer. The object is to provide a microwave dry solid content / moisture meter that does not burn out.

[0008]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention is equipped with a mechanism for measuring a sample, and in order to measure the tare weight, a pan (sample receptor) before sample injection is dried by microwave and a sample pan is injected. In the microwave dry solids concentration / moisture meter, in which the sample is dried by microwave to measure the final weight of the pan after measuring the initial weight of A plurality of turntables are placed, and the tray or members in the vicinity thereof are made of a material having a high dielectric loss coefficient.

[0009]

[Action]

 According to the above configuration, since the saucer is made of a material having a high dielectric loss coefficient, it is heated by microwaves.For example, the sample impregnated in the filter paper is heated by direct microwaves. It is dried by both heating the saucer which is heated rapidly. Then, the microwave at this time becomes gentle heating (oven type) instead of strong electric field type as in the past. Therefore, since moderate heat is applied to the sample from the top side and the saucer side, the sample dries quickly and does not cause burnout at the bottom part, nor does condensation form between the bottom part of the saucer and the filter paper. Nor. Moreover, since it is not a strong electric field type, the size of the applicator can be freely selected, and it is possible to put many saucers into which the same sample has been injected into the applicator and perform drying at the same time. Become.

[0010]

【Example】

 FIG. 1 shows the structure of the microwave dry solid content concentration / moisture meter according to the embodiment, and FIG. 2 shows the structure of the saucer of the embodiment. In FIG. 1, the applicator 10 is connected to a waveguide 11 that transmits the microwave output from the magnetron, and the applicator 10 is an oven type instead of a strong electric field type (waveguide type). The size is set to accommodate the illustrated turntable 12. The shaft 13 of the turntable 12 is connected to an index unit 15 and an elevating device 16 via a microwave leakage prevention unit 14, and the rotation of the turntable 12 is controlled by the index unit 15 while the elevating device 16 elevates the table. Is possible. Further, on the upper surface of the turntable 12, in the embodiment, five receiving trays (sample receivers) 18 can be arranged along the outer circumference thereof. That is, the applicator 10 of the present invention is not of a strong electric field type, and its size can be freely selected, so that a plurality of samples to be carried out for the same measurement object (specimen) can be processed at one time. .

The tray 18 is made of a material having a high dielectric loss coefficient, Teflon containing carbon or graphite in the embodiment, and has a cylindrical or H-shaped cross section as shown in FIG. It is used as a dish. In addition, ceramics, heat-resistant plastics, etc. can be used as the material having a high dielectric loss coefficient. The filter paper 19 is packed inside the tray 18, and the sample is absorbed in the filter paper 19. With such a material having a high dielectric loss coefficient, the temperature of the saucer 18 itself is rapidly increased by the microwave, and the sample absorbed by the filter paper 19 is directly irradiated onto the heated saucer 18. It is dried efficiently by moderate heating of both microwaves, which is not too strong.

Therefore, the tray 18 has an advantage that the scorching of the sample is significantly reduced and the dew condensation does not occur on the lower part of the filter paper 19. That is, when a material having a low dielectric loss is used for the saucer 18, heat generation efficiency is poor under an applicator that is not a strong electric field type, and the saucer itself does not rise to an appropriate drying temperature. Condensation occurs between the odor and the filter paper 19. Therefore, in the present invention, the saucer 18 is made of a material having a high dielectric loss, and the saucer itself is heated by microwaves to prevent dew condensation.

In FIG. 1, a large number of the trays 18 are stocked in a stocker 21, and a feeder 22 is provided to feed the trays 18 from the stocker 21 into the applicator 10. On the other hand, a discharge guide 23 and a discharge path 24 for discharging the tray 18 for which the measurement has been completed are provided, and a lift device 26 is connected to the discharge guide 23 via a microwave leakage prevention unit 25. Therefore, the tray 18 can be guided to the discharge path 24 by lowering the discharge guide 23 to a predetermined position by the elevating device 26.

A sample injection port 27 is provided on the upper surface of the applicator 10, and a dispenser 28 for dispensing a fixed amount of the sample 5 is arranged above the sample injection port 27. On the other hand, below the turntable 12, a weight scale (electronic scale) 29 is provided via a microwave leakage prevention unit 30, and the tip end 31 of the measurement unit of this weight scale 29 is a hole formed in the turntable 12 ( (Not shown) contacts the tray 18. A control unit 32 is provided to drive and control the index unit 15, the lifting device 16, the feeder 22, the lifting device 26, the dispenser 28, and the like.

The embodiment is configured as described above, and its operation will be described below. First, the saucer 18 in the stocker 21 is supplied into the applicator 10 by the feeder 22. At this time, the turntable 12 is rotated by the index unit 15, so that the saucer 18 carried in by the turntable 12 is turned. Are sequentially set to the predetermined positions. Then, when, for example, five (or three) of the saucers 18 are set, microwaves are radiated into the applicator 10 through the waveguide 11, and the five saucers 18 are dried by baking. In this air-baking, since the pan 18 is made of a material having a high dielectric loss coefficient, quick drying is possible without using a conventional strong electric field type applicator.

Upon completion of the baking, the turntable 12 is lowered by the lifting device 16 and the tray 18 is set on the weighing scale 29 (tip 31 of the measuring section), after which the tare weight is measured. When this measurement is completed, the turntable 12 moves up, the next tray 18 rotates to a predetermined position, and then descends again. By repeating this operation, the tare weights of all the trays 18 are measured in order. .

When the measurement of the tare weight is completed, a predetermined amount of the sample 5 is sequentially injected from the dispenser 28 into the five trays 18 through the inlet 27, and the sample 5 is filled with the filter paper in each tray 18. Absorbed to 19. In this state, the initial weight of the five saucers 18 is measured by the weight scale 29. Then, when the measurement of the initial weight is completed, the microwave is again irradiated into the applicator 10, and the sample 5 is dried. At this time, the saucer 18 is heated to, for example, about 100 to 150 ° C., and the sample in the saucer 18 is dried not only by direct microwave heating but also by heating the saucer 18 itself. . Therefore, in this case, there is an advantage that the drying can be performed quickly, the burning of the solid content in the lower portion of the filter paper 19 can be prevented, and further no dew condensation will occur.

When the drying of the sample is completed, the final weights of the five saucers 18 in which the solid content remains are measured, and the saucers 18 for which the final weights have been measured are sequentially discharged by the discharge guide 23 through the discharge path 24. Is discharged to. Then, the solid content concentration is calculated based on the final weight of the five saucers 18, the tare weight, and the initial weight. As described above, according to the present invention, since the plurality of pans 18 can be simultaneously executed in the baking and the sample drying, there is an advantage that one cycle of the same sample can be measured in a short time. When the same sample is measured 5 times, the conventional apparatus required about 20 minutes, whereas the apparatus of the embodiment could complete the measurement within 10 minutes. Also in the present proposal, the pan 18 arranged on the turntable 12 can be divided into halves for measuring different samples, and the sample drying and the air-drying can be performed simultaneously as shown in FIG. For example, it is possible to configure a turntable on which six samples are placed and to simultaneously dry the three pans into which the sample of this time is injected and the three empty pans for the next sample.

In the above embodiment, the receiving tray 18 itself is made of a material having a high dielectric loss coefficient, but the receiving tray 18 is made of heat-resistant glass similar to the conventional one, and as shown in FIG. A carbon sheet can be placed on the inner side P of the bottom portion, or a silicon carbide plate can be bonded to the outer side Q 1 of the bottom portion. Further, the member at the set position of the tray 18 in the turntable 12 can be made of a material having a high dielectric loss coefficient, and with these configurations, it is possible to obtain the same effect as that of the above embodiment.

[0020]

[Effect of device]

 As described above, according to the present invention, an applicator for applying microwaves is formed in a size that is not a strong electric field type, and a turn for setting a plurality of pans for injecting a sample is provided in the applicator. Since the table is placed and the saucer or the parts in the vicinity thereof are made of a material having a high dielectric loss coefficient, the size of the applicator can be freely set, and the baking drying or Sample drying can be performed simultaneously.

Further, since the sample is efficiently dried by the direct microwave heating and the heating of the saucer which raises the temperature rapidly, the overheat phenomenon that the solid content is burned off at the bottom of the saucer does not occur. However, there is an advantage that condensation is prevented. Therefore, measurement error is eliminated, and scrubbing does not complicate cleaning.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a microwave dry solid content concentration / moisture meter according to an embodiment of the present invention.

2A and 2B are diagrams showing a configuration of a tray of an embodiment, FIG. 2A is a perspective view, and FIG. 2B is a sectional view.

FIG. 3 is a diagram showing a schematic configuration of a conventional solid content concentration meter, FIG. 3 (A) is a diagram showing a configuration using a strong electric field type applicator, and FIG. 3 (B) is B- of FIG. It is a B sectional view.

[Explanation of symbols]

 1, 10 ... Applicator, 2, 18 ... Saucepan, 5 ... Sample, 11 ... Waveguide, 12 ... Turntable, 16, 26 ... Elevating device, 19 ... Filter paper, 22 ... Feeder, 23 ... Discharge guide, 28 ... Dispenser, 29 ... Weight scale, 32 ... Control unit.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Teruo Osawa, 2-1 Teruo Osawa, Fukuoka 2-1-1, Kamifukuoka-shi, Saitama Inside Nippon Express Co., Ltd. Kawagoe Manufacturing Co., Ltd. (72) Toshio Shimamura 3586 Yoshihara, Ami-cho, Inashiki-gun, Ibaraki Prefecture Tsumura Co., Ltd. (72) Inventor Masaaki Mori 3586 Yoshihara, Ami-cho, Inashiki-gun, Ibaraki Prefecture Tsumura Co., Ltd.

Claims (1)

[Scope of utility model registration request] 1. A mechanism for measuring a sample is provided, and a pan before sample injection is dried by microwave to measure a tare weight, and after measuring an initial weight of the sample-injected pan, a final weight of the pan is measured. In the microwave dry solid content / moisture meter for drying the sample by microwave for measurement, a turntable for placing a plurality of pans for injecting the sample is arranged in the microwave applicator, and the pan or the vicinity thereof is arranged. 2. The microwave dry solid content concentration / moisture meter, characterized in that the above member is formed of a material having a high dielectric loss coefficient.