CN87204110U - Speedy measuring meter of wheat straw moisture - Google Patents
Speedy measuring meter of wheat straw moisture Download PDFInfo
- Publication number
- CN87204110U CN87204110U CN 87204110 CN87204110U CN87204110U CN 87204110 U CN87204110 U CN 87204110U CN 87204110 CN87204110 CN 87204110 CN 87204110 U CN87204110 U CN 87204110U CN 87204110 U CN87204110 U CN 87204110U
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- circuit
- straw
- utility
- quick measuring
- humidity
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- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
The utility model discloses a speedy measuring meter of wheat straw moisture, comprising a parallel connection type capacitance three-point oscillation circuit, a common discharge big circuit, a low impedance output circuit, a high pass filting circuit, a detection circuit, a shunt circuit, a feedback circuit, two parallel metal scion plates, a humidity display meter, etc., and the lateral surfaces of the two parallel metal scion plates are insulated from straw and water. Used for paper mills purchasing raw materials wheat, the utility model can deduct moisture exactly and prevent fires caused by fermentation self-ignition of deposited straw.
Description
The utility model belongs to measuring instrument.
Past existing straw humidity instrument for quick measuring comprises quartz crystal oscillator circuit (1), high-pass filtering circuit (2), detecting circuit (3), divided circuit (4), two blocks of parallel metal skewer plates (5) of making sensor, humidity display table (6).When this instrument uses, metal skewer plate is inserted in the bundled straw.Because straw humidity difference, its conductive capability difference so pass through the electric current difference of metal skewer plate, flows through the electric current difference of humidity display table, and its pointer indication is also different naturally.But, because the indicated humidity of humidity display list index is the humidity of the straw in the middle of the two metal skewer plates, when the straw humidity of two skewer plate lateral surfaces not simultaneously, electric current by two skewer plates also can change, electric current by the humidity display table also changes thereupon, so the humidity of humidity display table indication is different with the straw humidity in the middle of two sheet metals, thereby causes error.And because this instrument employing is quartz crystal oscillator circuit, its cost is higher.
The utility model provides a kind of error less, lower-cost straw humidity instrument for quick measuring.
The utility model adopts parallel connection type Colpitts oscillation circuit (7), and its frequency stability reaches 3 * 10
-4/ hour, though lower than crystal oscillation circuit.But each puts only several seconds during the straw moisture measurement, and its degree of stability is enough to satisfy the demand.Because electric capacity is more much lower than quartz crystal oscillator price with the price of inductance, so the utility model cost is lower.
The utility model is too little because of parallel connection type electric capacity three electric formula oscillating voltage output amplitudes.Provide big circuit (8) altogether so add one-level.
The utility model adds one-level emitter output circuit (9).To obtain Low ESR output, guarantee when the straw high humidity, to still have than high output voltage.
The utility model the lateral surface of two metal skewer plates be added with can with the insulating material (10) of straw and water insulation, can reduce of the influence of the straw of two metal skewer plate lateral surfaces, thereby error reduces to the indication of humidity display table.
The utility model oscillating voltage can reduce the influence of subordinate's (load) to oscillating tube from the Low ESR emitter output of oscillating tube, sends out amplifier stage double as buffer stage simultaneously altogether; Oscillatory circuit output resistance in series (11), the load that can alleviate oscillator; Send out amplifier stage series connection negative feedback resistor (12) altogether.Also can alleviate oscillator loading; It is set that above-mentioned measure is the frequency stability that improves oscillator.
The utility model uses in the time of can purchasing straw for the paper mill, both can deduct moisture content more accurately, and the nature that can prevent from again to ferment when the high humility straw from stacking causes fire.
Description of drawings: Fig. 1, the utility model principle assumption diagram;
Fig. 2, the utility model two metal skewer plate views;
Fig. 3, former straw humidity instrument for quick measuring structure principle chart.
Claims (4)
1, a kind of straw humidity instrument for quick measuring comprises quartz crystal oscillator circuit.High-pass filtering circuit, detecting circuit, divided circuit, two blocks of parallel metal skewer plates making sensor and humidity display table, the oscillatory circuit that is characterised in that of the present utility model changes parallel connection type capacitance three-point type circuit into.And be added with one-level and provide big circuit and one-level low-impedance output circuit altogether, the lateral surface of making two blocks of parallel metal skewer plates of sensor be added with can with the insulating material of straw and water insulation.
2,, it is characterized in that the emitter output of oscillating voltage from oscillating tube according to claim 1 described straw humidity instrument for quick measuring.
3,, it is characterized in that oscillatory circuit output resistance in series according to claim 1 described straw humidity instrument for quick measuring.
4,, it is characterized in that sending out altogether amplification grade circuit series connection negative feedback resistor according to claim 1 described straw humidity instrument for quick measuring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 87204110 CN87204110U (en) | 1987-04-02 | 1987-04-02 | Speedy measuring meter of wheat straw moisture |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 87204110 CN87204110U (en) | 1987-04-02 | 1987-04-02 | Speedy measuring meter of wheat straw moisture |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN87204110U true CN87204110U (en) | 1988-04-06 |
Family
ID=4820027
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 87204110 Pending CN87204110U (en) | 1987-04-02 | 1987-04-02 | Speedy measuring meter of wheat straw moisture |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN87204110U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101236168B (en) * | 2007-01-31 | 2010-12-08 | 北京林业大学 | Plant moisture percentage measuring apparatus |
| CN107669221A (en) * | 2016-08-01 | 2018-02-09 | 德国福维克控股公司 | Cleaning device with detection device |
-
1987
- 1987-04-02 CN CN 87204110 patent/CN87204110U/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101236168B (en) * | 2007-01-31 | 2010-12-08 | 北京林业大学 | Plant moisture percentage measuring apparatus |
| CN107669221A (en) * | 2016-08-01 | 2018-02-09 | 德国福维克控股公司 | Cleaning device with detection device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication |