CN2044346U - Precision digit water level meter - Google Patents
Precision digit water level meter Download PDFInfo
- Publication number
- CN2044346U CN2044346U CN 88200109 CN88200109U CN2044346U CN 2044346 U CN2044346 U CN 2044346U CN 88200109 CN88200109 CN 88200109 CN 88200109 U CN88200109 U CN 88200109U CN 2044346 U CN2044346 U CN 2044346U
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- precision
- water level
- nut
- utility
- instrument
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Abstract
The utility model relates to a precision digit water level meter, which is characterized in that the precision digit water level meter is composed of an instrument and a sensor, wherein, the instrument is composed of an input circuit, a control circuit and a counting circuit. The main parts of the sensor are a screw rod driven by a step motor directly and a drive nut which is connected with a survey probe, and the nut with the survey probe is moved up and down. The precision of the utility model is higher than the precision of the various existing molder liquid level meters and water level survey probes, the resolution reaches 0.01 millimetre, the utility model has good repeatability, and the precision digit water level meter can meet the requirements of a high precision research experiment and an ordinary detection. Except that the utility model can be used for hydrotechnics, river engineering and harbor engineering, the utility model can be also widely used for departments of machinery, petrochemical industry, metering, earthquakes, geographical hydrology, boilers, etc.
Description
The present invention relates to a kind of precision digital limnimeter, it belongs to the level gauging field.
Present fluid level measuring instrument precision level is low, and the cost height, influences scientific research and testing and testing.
The objective of the invention is to provide a kind of measuring accuracy that improves in the scientific experiment, satisfy the high-acruracy survey instrument of needs in scientific research and testing and the testing.
Invention is achieved in that
The precision digital limnimeter partly is made up of instrument and sensor two.Instrument partly is by input circuit, control circuit and counting circuit are formed, Fig. 1. be principle of work block scheme of the present invention, now be summarized as follows: a start, chaining pin is upwards sought zero point, after zero, chaining pin is from top to bottom sought the water surface, the chaining pin one contact water surface, counter shows elevation, and thereafter, chaining pin from bottom to top breaks away from the water surface, one breaks away from the water surface, chaining pin is from top to bottom sought the water surface again ..., the chaining pin trackable surface all the time that goes round and begins again, counting circuit correspondingly demonstrate actual elevation.
The critical piece of sensor is the transmission nut of the stepper motor screw mandrel that directly drives and the chaining pin of ining succession, the rotation of nut is subjected to the restriction of frame upper rail, so during the screw mandrel rotation, nut can not rotate, and is being with chaining pin to move up or down.Screw mandrel and nut are finished by accurate screw tap during fabrication.
Fig. 2. be sensor construction figure.1 is stepper motor, and 2 is motor cabinet, and 3 adapter sleeves are led white in 4,5 frames, 6 nuts, 7 sockets, micro switch on 8,9 slide blocks, 10 screw mandrels, 11 chaining pins, 12 times micro switch, 13 bearings, 14 bearing seats.
Fig. 3. be circuit diagram of the present invention.I is for importing partly, and II is for controlling partly, and III shows that partly IV is the output part.
One. the input part:
This is the circuit that the water surface non-electrical signal of sensor senses is changed into electric control signal, is the Key Circuit that non electrical quantity is surveyed instrument.Formed (shown in seeing that I partly) by vibration, detection, shaping, anti-phase amplification that T101 to T108 constituted.
Its perception chaining pin has oncontacting water and sends a signal, touches the then blocking of oscillator of water, through detection, shaping, " 0 " attitude signal of anti-phase amplification output.On the contrary, an one state signal is then exported in dehydration.Control partly decides its working method according to its one state and " 0 " attitude.
Two. control part: (seeing that II is partly)
1. control partly is the hinge of instrument, has considered following function when design:
(1). during work, chaining pin should be able to High Precision Automatic trackable surface, and when chaining pin touched the water surface downwards, numeral should show that a moment is in order to observing and printing.
(2). during start,, and show a moment so that observe and whether correct no matter chaining pin whether in water, always should upwards seek the benchmark microswitch earlier, touches the back numeral and shows the benchmark elevation.The automatic then returning tracking water surface.
(3). should be able to self-correcting so that error-free number (being step-out) to be arranged in the inspection work.
(4). be lower than lower limit as water in the work, chaining pin drops to down in limited time, step-by-step impulse should locking in order to avoid damage limit switch and cause motor desynchronizing, but water one goes up, and can discharge automatically again and continue to follow the tracks of.
(5). in the work, chaining pin has been raised to upper limit position, and this moment, chaining pin did not break away from the water surface yet, the then same locking of step-by-step impulse, the water surface is once decline can discharge the continuation tracking again voluntarily.
Set forth control working condition partly from change-over gate and master control door below.
2. change-over gate:
One start, by rest-set flip-flop control zero gate Db is opened, water control door Da closes, and motor is clockwise, after chaining pin rises to reference point, chaining pin is benchmark microswitch breakdown, and motor reverses, and chaining pin descends, one from the benchmark microswitch, it produces a pulse, triggers the RS trigger, will close zero gate, the water control door is opened, at this moment, not in water, then motor continues to reverse as if chaining pin, chaining pin descends, until touching water, the signal level that the water control door is partly sent according to input, the clockwise and reverse of decision motor.
3. master control door:
The demonstration time controller of forming by trigger (CD) and T503, when DC exports from " 0 " attitude one state, there is a pulse signal to trigger this rest-set flip-flop, make Q end output one state, close the master control door, stop stepping pulse signal.
Form downscale protection by Fd and De:
When water level is lower than the lower position, and chaining pin supports limit switch again, limit switch closure then, and Fd exports " 0 " attitude.Because not in water, importing, chaining pin partly exports one state again.After Fd and Dc logic, output " 0 " attitude, De exports one state, closes the master control door.
Form upscale protection by Dd:
When water level surpasses upper limit position, chaining pin breakdown benchmark microswitch, simultaneously, again because chaining pin also touches water, input is output " 0 " attitude partly, and then Df output one state is closed the master control door.
It closes step-by-step impulse when making motor commutation the monostable that is made of 5G672--1.
Constitute another monostable circuit by 5G672--2, finish the shaping of step-by-step impulse, make to supply with to calculate demonstration and export the waveform that drives to be a completed wave.
Three. show partly
Show partly preceding four, counting, decoding, display circuit are general electric type circuit, here no longer narration.The counting that the back is one, decoding, demonstration are for supporting with our sensor, and when promptly joining first formula sensor, mantissa (0.01mm) is added and subtracted in each pulse; When joining second formula sensor, each pulse plus-minus five mantissa (0.05mm); For this reason, and design is unique x1/x9 counting, and display circuit is made up of five Sheffer stroke gates and two phase inverters, and is during x1, by its control, the same with general counting circuit.And during x9, it is controlled again and finishes the jumping five-function, and can be the same with general counting circuit, reversiblely advances (seeing that III partly).
Four. output drives
This is that the shift pulse signal that will export from circuit is rotatablely moving of motor, thereby the drive chaining pin is rectilinear motion up and down, because we have selected the self-excitation stepper motor for use, the sensor part size that makes it instrument is little, and moving consumption is low.Corresponding output pulse distribution is amplified partly also fairly simple, and its amplifier composition that is made of a ring distributor (5G674) and T401 to T409 is as scheming the IV part.
Ring distributor is distributed to amplifier with pulse signal one by one by certain time sequence and is carried out power amplification, the drive stepping motor rotation.
Advantage of the present invention:
1. precision is higher than liquid level gauge and the needle water level gauge of existing various types, an order of magnitude,
2. the input circuit of this instrument is created, and passes to the high audio oscillating current on the needle point, makes needle point touch water circuit failure of oscillation, no current, the error of having avoided polarization phenomena to cause.
3. no matter upwards change downwards of control circuit design water level, ability reading and output digital signal have avoided water surface tension to cause the uncertain error of the true water surface when all being the descending tactile water of chaining pin.
4. signal reaction speed is fast.Reduce the equivalent resistance of water with core transformers, thereby eliminate water temperature, water quality causes error.
5. this Instrument sensor directly drives accurate screw mandrel by stepper motor, and without speed change gear, the chaining pin of ining succession of the nut on the screw mandrel is owing to only at downward reading, eliminated the gap error of drive lead screw and nut.
6. the wrong number problem (comprising step-out) when having solved motor that the step-by-step movement limnimeter exists and frequently reversing.And be provided with self-calibrating apparatus.
7. to influencing the critical component screw mandrel and the nut of precision, taked the measure of innovation in design.Eliminated various stress and reduced error with anti-deformation.Nut is made (singly, three) and is become raising smooth finish, interchangeability and work efficiency by accurate screw tap.
This instrument also can be widely used in departments such as machinery, petrochemical complex, metering, earthquake, the geographical hydrology, boiler except that can be used for scientific research and testing such as water conservancy project, river conservancy worker, harbor work.Every needs carry out the place of high-precision liquid level measurement can use this instrument, and can be as the detecting instrument of general measuring instrument.
Claims (4)
1. precision digital limnimeter is characterized in that it partly is made up of instrument and sensor two:
A. described instrument is made up of input circuit, control circuit and counting circuit,
B. described sensor by stepper motor (1), adapter sleeve (3), in lead white (4), nut (5), socket (7), go up micro switch (8), slide block (9), screw mandrel (10), chaining pin (11), micro switch (12) and bearing (13) are formed down.
2. the described instrument of root a tree name claim 1 is characterized in that the stepper motor of sensor directly drives screw mandrel, the chaining pin of ining succession of the nut on the screw mandrel, and the rotation of nut is controlled by the guide groove on the frame.
3. the described instrument of root a tree name claim 1 is characterized in that also being provided with self-calibrating apparatus.
4. root a tree name claim 1,2 or 3 described instruments is characterized in that screw mandrel and nut finish by accurate screw tap during fabrication.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88200109 CN2044346U (en) | 1988-01-15 | 1988-01-15 | Precision digit water level meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88200109 CN2044346U (en) | 1988-01-15 | 1988-01-15 | Precision digit water level meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2044346U true CN2044346U (en) | 1989-09-13 |
Family
ID=4835598
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 88200109 Withdrawn CN2044346U (en) | 1988-01-15 | 1988-01-15 | Precision digit water level meter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2044346U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103644898A (en) * | 2013-12-05 | 2014-03-19 | 长江水利委员会长江科学院 | Water boundary recognition measurement system for river model test and water boundary recognition measurement method |
-
1988
- 1988-01-15 CN CN 88200109 patent/CN2044346U/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103644898A (en) * | 2013-12-05 | 2014-03-19 | 长江水利委员会长江科学院 | Water boundary recognition measurement system for river model test and water boundary recognition measurement method |
| CN103644898B (en) * | 2013-12-05 | 2015-10-28 | 长江水利委员会长江科学院 | River model test water boundaries identification measuring method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |