JPS5970952A - Apparatus for measuring water content - Google Patents

Abstract

PURPOSE:To automatically perform the dehydration and drying of an object containing moisture being a finely cut article such as sea laver, by a method wherein a plurality of water content measuring circuits corresponding to a water content range are provided in a drying process and water content signals are fed back in controlling a drying apparatus. CONSTITUTION:Sea laver 2 being an article to be dried loaded on a conveyor 1 is carried into a drying chamber 3 in a moisture contained state and dried under heating by hot air due to a heater 4 and a blower. The drying degree of the laver 2 is measured by electric resistances between electrodes of a plurality of water content measuring sensors 5 contacted with said laver 2. The water content signals measured by the sensors 5 are inputted to control circuits A, B,... and the output 21 (21a...) is taken by an amplifier 22(22a...) to be displayed by a meter 23(23a...) as well as converted to a control signal through a converter part 24(24a...) and this converted signal is fed back to a drying apparatus control part 26(26a...) through a feed-back part 25(25a...) to automatically operate a dehydrating and drying apparatus so as to satisfy a preset condition.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an apparatus for measuring the moisture content of a material having a substantially flat surface and containing water, such as a shredded material containing water such as seaweed.

[Technical background of the invention and its problems]

Next, it cannot be done immediately, but a part of the sample is taken out from the top of the conveyor, this weight and the weight are measured, the sample is dried, and the weight A is then measured, and the weight obtained is compared and calculated. However, this process took a lot of time and had a big impact on the production process. In addition, since the moisture content cannot be determined immediately, drying is dependent on temperature control, and sufficient quality control cannot be achieved.Therefore, there is waste of fuel (such as heavy oil) in terms of energy conservation. That was a problem. Furthermore, when drying seaweed, etc., a wide range of moisture content is generally required, from 15% in the final step of drying to 800-1000% immediately after dehydration or at the entrance of the dryer.

However, the conventional moisture content is '6+! 800-1
There was a drawback that high moisture content such as 00Q% could not be measured immediately.

[Purpose of the invention]

The object of the present invention is to continuously measure the moisture content of a continuously moving body such as a belt conveyor in a dehydrating and drying system for objects such as seaweed that contain 1 (II) 100% moisture, and also to measure 11 + weighing 11. A wide range of 6 from 45 to 1000%
11" can be set, and the water rate of the measured proboscis can be measured four times at any position during the moving process, and the operating conditions such as dehydration, drying and drying systems, etc. etc. up to J
It is an object of the present invention to provide a water content determination device that can perform one system test i1 so that A is obtained.

[Embodiments of the invention]

Regarding this invention! A situation will now be described with reference to the drawings of FIGS. 1 to 4, which are examples of actual performance. Figure 1 shows dehydration of rt6 moss.

In the configuration diagram of the drying device, δσ moss, which is the material to be dried 2 loaded on the conveyor 1, is transported while containing moisture to the drying section 3, where it is heated and dried by hot air from the heater 4 and the blower. . When this dryness is detected, that is, when the water content is broken, it can be taken out as an electrical signal between the two electrodes of the water content measurement sensor 5 that comes into contact with the surface of the drying proboscis 2. Naturally, the value of 6 (11 constant) is different near the entrance of the drying chamber 3 and near the exit. Fig. 2 shows an example of a sensor 5 for measuring the moisture content of the material to be dried 2, in which the center pole 5a of a set of rollers contacts the surface of the material to be dried 20 on the conveyor l and outputs a signal, and is placed at the required location. .

As shown in the circuit diagram of FIG. 3, this measurement control device 11f''i has multiple control circuits (representatively A, B, (only three circuits of C are shown).

Taking A as an example, the configuration of this control circuit is as follows:
1 and the positive power supply 10 are common to each circuit, and are also the 1/drive power supply for the amplifier 22. Further, the zero'1 section 12 serving as a reference is a common reference component for each circuit. The sensor 5 of the present invention has one end connected to a zero potential 12 and the other end connected to a resistor 13,
A comparator circuit for comparing this detection resistance value has a capacitor 7 connected to both ends of the sensor 5, and forms a photodischarge circuit with a resistor. The opposite side of the resistor 13 is connected to the positive power supply 10.

Connect resistor 14 and resistor 15, and connect resistor 16 to the connection part.
is connected. Connect the bent end of this resistor 16 to resistor 17'
J? A, and this connection end is connected to the amplifier 220 input. Further, the anti-amplifier input side of the resistor 170 is connected to the zero potential 12. The connection between the sensor 5 and the resistor 13 is 0"0"
The resistor 18 is connected to the resistor 18, and the amplifier 22 is connected to the opposite side of the resistor 18.
0 input, and a resistor 19 and a capacitor 20 are connected to that connection. The opposite side of the resistor 19 and capacitor 200 is connected to the output of the amplifier 22. Further, one end of the resistor 14 is connected to the positive power supply 10, and one end of the resistor 15 is connected to the zero potential 12. The output of the amplifier 22 is taken out between it and the zero potential 12 as an output 2]. The output 21 displays a digital or analog display on a meter or the like, and at the same time converts the signal output from the output 2 through a converter, and sends the signal to the controller via a feedback section. 6, and the automatic operation control of the system can be performed. Further, the '1α source used in the 1tilJ control circuit of the present invention is a constant voltage piezoelectric power source.

Further, the configuration of the circuit "2" is the same as that of the circuit ti1.1 described above, and therefore a detailed explanation will be omitted, but the resistance values of each 47B are different depending on the water content that is the measurement target range.

Next, the action of the drying device 6 using the above-mentioned Inno 4 composition will be explained. The rabbit of the circular irs diagram in Figure 3 < (
I'& the water content σ11] In the constant device -C1 constant voltage If company's review] 0'6C j2 and the positive power source 10 are applied. In this state, the electrode 5a of the sensor 5 is placed on the surface of the material 2 to be dried, such as seaweed, which is being moved.
The change in resistance value between the two electrodes of the sensor 5, i.e., 1.
Changes in the α flow value or '+IE pressure value are stabilized using the charging and discharging action of the capacitor 7. Moreover, the moisture content of the dried material 2 can be determined by setting the mutual =q ratio of the resistor 13, resistor 14, and resistor 15, which are connected together, to be a constant ratio for each circuit.

) also sets the reference resistance value between the electrodes of the sensor 5 to <til
The reference value output 2] can be made zero by determining it for each fixed range and making the resistance 14 variable by iJ. Next, the resistors 18 and 19 and the resistors 16 and 17 have values that decide the mutual balance, especially the resistors 18 and 1.
9 is also a factor that determines the amplification factor of the amplifier 22.

It should be noted that the capacitor 20 is provided to serve as a smoothing function t1 of the amplifier output 21 between I and L.

As described above, in the water content measuring device of the present invention, the water content is within the range of 111+1 1jll ii 1.5 to 1000%.
Because of the wide range of moisture content ranges mentioned above, the drying process can range from 15% to 50%, for example! i(1~IOQ%,
By measuring the moisture content of the material to be dried 2 between 100 and 200% and 200 and 1000%, and feeding back the moisture content signal to the control of the dehydration and drying rack equipment, Adjust the temperature, humidity, wind speed, etc. of the dehydration and drying system to be optimal for drying.
can be done.

As described above, a signal corresponding to the moisture content measured by the electrode of the sensor 5 is taken out to the output 21 via the amplifier 22, and the meter is displayed 2. At the same time, the dehydration of the material to be dried and the automatic operation of the drying system are performed. 41 paper, the output 21 is a rhombus (
For example, direct current voltage or r, J
:'! , :, convert it into a flow, etc., and feed it back to tiilJ control f, B 2 (i) via the feedback section δ,
The dehydrating and drying equipment itself so that it becomes the preset h4 items! Mouth: Driving can be done using IT.

Next, an example of the relationship between the moisture content and the output value when using the moisture content measuring device will be described. As shown in Figure 4,
If the horizontal axis is the output value E (1 "pressure)" and the vertical axis is the water content W, then the relationship regarding each of the above-mentioned 12 plural water content ranges can be found.These !characteristic curves A, +3.

C, f) are the water content ranges of the above-mentioned glue, i.e. curve A is 200 to 1000, and curve B is 100 to 200.
%, C represents an example of the characteristics of 50 to 100%, and Dt represents a characteristic example of 15 to 50%.
! Depending on the type of song, 1-A, B, C1D, the moisture content +
A fixed position (during the drying process) can be determined. By converting the characteristic curve 1a into a typical formula (-the following formula) and programming it into a microcomputer and using it, automatic operation can be performed quickly and accurately.

[Effects of the first effect] As described above, according to the present invention, in the dehydration and drying system of I'IIi Chang-g, the water content of the dry matter, which is the water mixture of one inch of cut seaweed, can be reduced. 6111 In order to determine the moisture content during the drying process, the moisture content decreases to 1 (1) during the drying process. In addition, it uses a multi-point moisture content measurement method, which allows continuous measurement of the moisture content during the drying process of continuously moving drying materials such as seaweed. In the production of seaweed, it is possible to automatically operate a system for dehydration and drying based on a constant moisture content within the moisture content range of the product. Since it is possible to measure a region with a water content of about 15%, the system control statement is based on the relative softness of the conditions at the drying inlet and outlet. As shown in the figure, it can be fed back as a signal to the till 1! This has the effect of providing stable products of good quality.

4. Drawing i'+'s i'n tshi and bright■1 diagram e'
2) A side view of the drying chamber equipped with the moisture content measuring device of the present invention, and Figure 2 shows the state in which the sensor used in the moisture content measuring device of the present invention is installed. Noboru! Figure 3 is a circuit diagram of the present invention, and Figure I4 is a characteristic curve diagram of the output and water content measured by the moisture content 61[] constant device 1λ of the present invention.

1...Conveyor 2...Compared dry stuff 3...
Dryer 5...Sensor 7.20...171
July 1098. Positive turtle 1 piece 11... Constant pressure power source 12... Zero stone, place 1:3. i4. Ib, 16
．． +7.18. i9...Resistor 21...Output (signal) 22...Amplifier O...Display section 24.
...) Second connection - Old time l; 25-Fee 1-Punk club 26...1lil] Gobe
A, 13. C, D...Curve (7317) Substitute Patent Attorney Norichika 1 (1 IJ) Figure 1 d Figure 2 Figure 3 248- Figure 4

Claims (1)

[Claims] A comparison circuit that compares the electrical resistance detected by the electrode and a comparison circuit for measuring the moisture content of the object by detecting the electrical resistance by contacting a sensor with an electrode to an object such as a finely chopped material containing water. An amplifier that amplifies the output, a display section that receives and displays signals from this amplifier, a control section that controls heaters, blowers, etc. based on signals from the amplifier, and is installed between this control section and the amplifier. A moisture content measuring device comprising a conversion section, a feedback section, and a constant voltage power supply for driving the same.