CN2035087U - High-frequency condensator fast water component detector - Google Patents

Abstract

The utility model relates to an analyzer for physical property used for the rapid determination of material moisture content, which is suitable for measuring various low price electric constant materials, particularly the moisture content of ceramic castable pug, powder lot, slurry and body. The utility model is characterized in that a sensor is integrally formed by a probe head, a high frequency oscillating circuit and a metallic shield box; a host measuring system which adopts an integrated analog operational circuit and the numeric display technique is provided with a probe indication circuit and a broken end alarm circuit; the probe head can be made into various shapes. The utility model has the advantages of broad measuring range, high precision, good linearity, high resolution, little influence of temperature and impurity, wide range of application, convenient operation, etc.

Description

High-frequency condensator fast water component detector

The utility model is a kind of analyzer for physical property of fast measuring substance moisture content content.Be applicable to and measure various low-k materials; The moisture of especially ceramic plastic pug, powder, slurry and base substrate.

Existing its characteristic of condenser type Moisture Meter and function are different.Report is also arranged both at home and abroad.For example Chinese patent ZL86200819 described " the quick Moisture Meter of condenser type ", adopt the low frequency bridge method, it is big that the material electricity is led influence; Sonde configuration is complicated, needs double layer screen; Though its measuring accuracy is better, range ratio is less and can not measure the moisture of materials such as the plastic pug of pottery, base substrate.GG87205091 number described Moisture Meter is though structure simply is only applicable to measure general solid material.And for example " the ceramic powder moisture teller " of Hunan " pottery " 8 or seven year first phase report also is confined to measure ceramic powder, and its scope of application is little, and function is incomplete yet.

Present known condenser type moisture teller ubiquity sensor resolution is poor, noise jamming is bigger than normal, and problems such as material and impurity electricity are led and influence of temperature change measuring accuracy, range are little, poor linearity are not tasted so far and solved well.

The utility model purpose is exactly at above-mentioned deficiency, provides a kind of and promptly have the resolution height, can get rid of that distributed capacitance and noise jamming, broad quantum, the linearity are good, temperature and impurity electricity lead that influence is little, usable range is wide; Can carry out the multi-functional moisture instrument of fast measuring again to the moisture of various materials such as the plastic pug of pottery, powder, slurry.

The utility model is achieved in that sensor and main frame adopt split-type structural, and sensor constitutes one by probe, high-frequency oscillating circuits and metallic shield box, can improve oscillation frequency, reduces the electric influence of leading measuring accuracy in the material.Probe is made of interior electrode and external electrode, external electrode is fixed on the front end of metallic shield box, interior electrode is fixed on external electrode central authorities with the insulated enclosure thing, it is multi-form that the geometric configuration of probe can be needle-like, tabular, cylindric, arc etc., to satisfy, to the determination of moisture of different material, especially ceramic material in various occasions.

Plastic sub-frequency circuit, integrating circuit, sampling hold circuit, square operation circuit, differential amplifier circuit, reference voltage source, gating circuit, zero potentiometer, A/D converter, numeric display unit and probe indication and web break alarm circuit are arranged in the host computer system circuit, become to be electrically connected between them.

Directly use the frequency of 18～22MHZ to import main frame, become the periodic quantity of transducing signal after to its integral operation,, just can guarantee to have good linearty in the wide-range scope again through square operation by integrator as transducing signal.

The temperature self-compensation circuit that is made of thermistor is arranged in differential amplifier circuit, can in wider temperature range, keep good linearty; Pass through zero potentiometer, can realize zeroing at any time, be not afraid of the zero point drift of environment temperature to sensor and host circuit generation, to adapt to the measurement under the different temperatures, improve measuring accuracy,, can calibrate calibration different materials by adjusting calibration, calibration potentiometer, make displayed value consistent, guarantee measuring accuracy with true value.

By the probe indication and web break alarm circuit that electronic component and time-base integrated circuit are formed, can find fault at any time, be convenient to maintenance.

The utility model has the advantages that: overcome the deficiencies in the prior art, it has characteristics such as good resolution characteristic and linear relationship, broad quantum, precision height, stable performance, calibration, calibration be simple, easy to use.It not only can be used on ceramic industry central laboratory and shop production line, carries out scene sampling and METHOD FOR CONTINUOUS DETERMINATION at any time, also is applicable to that industries such as grain, building materials, agricultural, food measure the water percentage of various low-k materials simultaneously fully.As cereal, oils, drinks, soil, sand grains, cement etc.The important technological parameters of this instrument sees table one for details.

The drawing explanation:

Accompanying drawing 1: the integrality synoptic diagram of moisture teller;

Accompanying drawing 2: the structural drawing of sensor probe;

Accompanying drawing 3: high-frequency oscillating circuits schematic diagram;

Accompanying drawing 4: host computer system block scheme;

Accompanying drawing 5: host circuit schematic diagram;

Accompanying drawing 6: probe indication and web break alarm circuit theory diagrams;

Specific embodiment of the utility model is described below in conjunction with the accompanying drawings:

As Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, shown in Figure 6: high-frequency oscillating circuits ［ 3 ］ is arranged in the metallic shield box ［ 4 ］, its working power of sensor ［ 1 ］ that its front end is probe ［ 2 ］, forms the integral structure form by ［ 2 ］, ［ 3 ］, ［ 4 ］ is provided by lead ［ 5 ］ by main frame ［ 7 ］, and transducing signal fx passes through single core cable line ［ 6 ］ reader ［ 7 ］.

Probe ［ 2 ］ is made of interior electrode ［ 8 ］, external electrode ［ 9 ］, insulated enclosure thing ［ 10 ］ is arranged between two electrodes, also probe is fixed on the metallic shield box ［ 4 ］ by nut ［ 11 ］, the geometric configuration and the structure of probe can be decided according to the character of tested material, as Fig. 2: (a) pin type is applicable to plastic pug, (b) the flat base substrate that is applicable to, (c) drum type brake is applicable to slurry, powder and granule materials, (d) the arc formula can be fixed on the pug mill exit, is applicable to the moisture of METHOD FOR CONTINUOUS DETERMINATION pug.

In the high-frequency oscillating circuits ［ 3 ］ of sensor ［ 1 ］, electrode ［ 8 ］ and ［ 9 ］ are connected on the two ends of inductance ［ 12 ］ respectively, form the LC frequency-selective circuit.Oscillatory circuit is formed in transistor ［ 13 ］ and ［ 14 ］, and signal does not have direct electromagnetic connection from the collector output of transistor ［ 14 ］ with the LC loop, has improved the stability of oscillation frequency.Transistor ［ 14 ］ is connected into the common-collector circuit form, has low resistance and strong load capacity, thereby has guaranteed that low resistance media such as moldable, slurry still can stably vibrate.Transistor ［ 13 ］ is connected into the common-base circuit configuration, the amplitude that has guaranteed vibration be worth condition mutually.Transistor ［ 13 ］ adopts direct lotus root to close with ［ 14 ］, and produces direct current negative feedback, the working point of having stablized circuit by resistance ［ 15 ］.Transistor ［ 16 ］ is connected into the common-collector circuit configuration, has further reduced the influence to the LC oscillatory circuit, has guaranteed simultaneously to flow to main frame to the high frequency transducing signal through electric capacity ［ 17 ］ with long cable.

In the host circuit system, transistor ［ 29 ］ is arranged in the plastic sub-frequency circuit ［ 18 ］, ［ 30 ］ and schmitt trigger ［ 31 ］ and the counting, frequency divider ［ 32 ］, ［ 33 ］, gating circuit ［ 26 ］ is touched with device ［ 34 ］ by JK, ［ 35 ］, comparer ［ 36 ］, phase inverter ［ 37 ］ and simulate switch ［ 39 ］, ［ 40 ］ form, integrating circuit ［ 19 ］ has operational amplifier ［ 41 ］, sampling hold circuit ［ 20 ］ has operational amplifier ［ 42 ］, ［ 43 ］, analog multiplier ［ 44 ］ and operational amplifier ［ 45 ］ are arranged in the square operation circuit ［ 21 ］, operational amplifier ［ 46 ］ is arranged in the differential amplifier circuit ［ 22 ］, ［ 47 ］, ［ 51 ］, with by thermistor ［ 48 ］, resistance ［ 49 ］, ［ 50 ］ temperature of forming is mended and is tasted circuit and calibration potentiometer ［ 53 ］, calibration potentiometer ［ 54 ］, reference voltage source ［ 27 ］ has stabilivolt ［ 38 ］.

Control F at the change-over period of A/D converter ［ 24 ］ the 14th pin end mark pulse feoc, high frequency transducing signal fx from sensor becomes low-frequency square-wave transducing signal f ' x unlatching gating circuit ［ 26 ］ through plastic sub-frequency circuit ［ 18 ］, in the one-period of this signal, integrator ［ 19 ］ carries out integral operation to reference voltage source ［ 27 ］, obtain the periodic quantity of transducing signal, and constantly send differential amplifier circuit ［ 22 ］ to by sampling hold circuit ［ 20 ］, after delivering to A/D converter ［ 24 ］ after the amplification and becoming digital quantity, show by display screen ［ 25 ］.When sensor, when probe does not insert material, adjust zero potentiometer ［ 23 ］, make differential amplifier circuit ［ 22 ］ be output as zero, display screen ［ 25 ］ is shown as zero, then probe is inserted material, ［ 22 ］ just have output, and ［ 25 ］ demonstrate numeral, as long as by adjusting calibration, calibration potentiometer ［ 53 ］, ［ 54 ］, just can guarantee that displayed value is consistent with true value in advance.Temperature-compensation circuit is formed in thermistor ［ 48 ］ and resistance ［ 49 ］, ［ 50 ］, and switch ［ 52 ］ is the school, surveys switch, dials 1 and is the measuring position, dials 2 and is the calibration calibrating position.

Working sensor just often, transducing signal fx gives transistor ［ 55 ］, ［ 56 ］ in probe indication and the web break alarm circuit ［ 28 ］ by cable ［ 6 ］, oxide-semiconductor control transistors ［ 58 ］ conducting after amplifying rectification, probe indication luminotron ［ 57 ］ is bright, ［ 58 ］ output low level simultaneously, control time base circuit ［ 59 ］, ［ 60 ］ are left alone without help shakes, and loudspeaker ［ 61 ］ does not ring.When sensor circuit breaks down or during with the tie ［ 5 ］ of main frame or ［ 6 ］ open circuit, owing to can not receive signal, transistor ［ 58 ］ ends, the output high level, probe indication luminotron ［ 57 ］ does not work, control time base circuit ［ 59 ］, ［ 60 ］ starting of oscillation simultaneously, loudspeaker ［ 61 ］ sends the alarm song of " pout, pout ... ".

Table one: important technological parameters

1, range: 0～100%

2, measuring accuracy:＜± 0.3%

3, resolution: 0.1%

4, reappearance:＜0.2%

5, temperature compensation: automatically

6, the reaction time:＜0.3 second

7, reading mode: three bit digital dynamic scans show

8, supply voltage: 220 ± 10% 50HZ

9, power consumption:＜5W

10, condition of work: 1) environment temperature: 0～40 ℃

2) ambient humidity: 5～95%RH

11, the working time:＞24 hours

12, weight:＜4Kg

Claims (7)

1, a kind of condenser type moisture teller of being made up of sensor and host computer system is characterized in that: (a), sensor [1] forms integral structure by probe [2] high-frequency oscillating circuits [3] and metallic shield box [4]; (b), the host computer system circuit is made up of with web break alarm circuit [28] plastic sub-frequency circuit [18], gating circuit [26], reference voltage source [27], integrating circuit [19], sampling hold circuit [20], square operation circuit [21], differential amplifier circuit [22], zero potentiometer [23], A/D converter [24], apparent counting apparatus [25], probe indication.

2, according to the described moisture teller of claim 1, the external electrode ［ 9 ］ that it is characterized in that sensor probe ［ 2 ］ is fixed on the front end of metallic shield box ［ 4 ］ with nut ［ 11 ］, and interior electrode ［ 8 ］ is fixed on the central authorities of external electrode with insulated enclosure thing ［ 10 ］.

3,, it is characterized in that it to be needle-like, tabular, different geometries such as cylindric, circular-arc according to claim 1,2 described probes (2).

4, according to the described moisture teller of claim 1, the middle transistor ［ 13 ］ of high-frequency oscillating circuits ［ 3 ］ that it is characterized in that sensor ［ 1 ］ is connected into the common-base circuit configuration, transistor ［ 14 ］ and ［ 16 ］ are connected into the common-collector circuit configuration, ［ 13 ］ close with ［ 14 ］ direct lotus root, the inside and outside electrode ［ 8 ］ of probe ［ 2 ］ and ［ 9 ］ are in parallel with inductance ［ 12 ］ directly forms frequency-selective circuit at the emitter of ［ 14 ］, and signal is drawn from the collector of ［ 14 ］.

5,, it is characterized in that the temperature-compensation circuit that in differential amplifier circuit ［ 22 ］, is provided with calibration potentiometer ［ 53 ］, calibration potentiometer ［ 54 ］ and forms by thermistor ［ 48 ］, resistance ［ 49 ］, ［ 50 ］ according to the described moisture teller of claim 1.

6, according to the described moisture teller of claim 1, it is characterized in that gating circuit ［ 26 ］ by JK flip-flop ［ 34 ］, ［ 35 ］ and operational amplifier ［ 36 ］, ［ 37 ］ and simulate switch ［ 39 ］, ［ 40 ］ are formed.

7,, it is characterized in that the clear terminal of JK flip-flop ［ 34 ］, ［ 35 ］ is connected with change-over period end mark pulse signal end the 14th pin of A/D converter ［ 24 ］ according to the described moisture teller of claim 6.

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