CN106931871B - Wide-range resistance type wave height sensor - Google Patents
Wide-range resistance type wave height sensor Download PDFInfo
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- CN106931871B CN106931871B CN201710319901.0A CN201710319901A CN106931871B CN 106931871 B CN106931871 B CN 106931871B CN 201710319901 A CN201710319901 A CN 201710319901A CN 106931871 B CN106931871 B CN 106931871B
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- tensioning frame
- lower tensioning
- steel wire
- tensioning
- wave height
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/24—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of resistance of resistors due to contact with conductor fluid
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/30—Assessment of water resources
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Fluid Mechanics (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
- Transmission And Conversion Of Sensor Element Output (AREA)
Abstract
The invention relates to a wide-range resistance wave height sensor, which comprises an upper tensioning frame and a lower tensioning frame, wherein two parallel resistance electrodes are fixedly connected between the upper tensioning frame and the lower tensioning frame and are connected with a detection circuit; the technical characteristics are that: the two parallel resistance electrodes are made of an integral steel wire rope, the middle part of the integral steel wire rope is hinged on the lower tensioning frame, and two ends of the integral steel wire rope are hinged on the upper tensioning frame. The invention can ensure the straightness and parallelism of two resistance electrodes of the wave height sensor, and the measuring range can reach 8-10m.
Description
Technical Field
The invention belongs to the technical field of experimental research of physical models of ports and offshore engineering, relates to a wave height sensor for detecting wave height and water level height in real time, and particularly relates to a wide-range resistance wave height sensor.
Background
In the technical field of experimental research of ports and offshore engineering, wave generation is a necessary experimental method for performing physical model experimental research, and a wave height sensor is required to be used for detecting wave height in real time in the wave generation process.
In general liquid level measurement, the liquid level changes slowly and is flat, so that ultrasonic, laser, radar, resistance, capacitance, pressure, floater and other liquid level meters can meet the measurement requirements. Wave height measurement is one of liquid level measurement, and because the liquid level changes rapidly, the pressure and float type measurement mode can not be used, and because the liquid level is very uneven, the modes such as ultrasonic wave, laser and radar can not be used, so that the wave height measurement can only select a resistance or resistance measurement mode.
At present, when wave height measurement is carried out, a small-range resistance type wave height sensor is generally adopted, and the small-range resistance type wave height sensor consists of two stainless steel pipes to form two poles of a resistor, but experiments show that parallelism between the two steel pipes and straightness of each steel pipe can be ensured only when the measuring range is smaller (the measuring range is smaller than 2 m), so that measurement accuracy is ensured. However, when the equivalent range is larger (the measuring range is larger than 2 m), even in the measuring occasion with the measuring range larger than 8m, if the resistance type wave height sensor structure is still adopted, the parallelism between two steel pipes and the straightness of each steel pipe cannot be guaranteed, the parallelism and the straightness between two steel pipes directly influence the linearity of the wave height sensor, so that the measuring precision is influenced, and the problem of low measuring precision caused by the enlarged measuring range is generated.
By searching, a published patent document related to the present patent application is found:
a double-wire capacitive wave height sensor (CN 203422058U) comprising a grounding measuring rod, a capacitive sensing wire, a wire collecting shaft, an upper spring locking wire, a spring, a lower spring locking wire, a connecting block, a circuit board, a handle inner cavity and a handle sleeve, wherein the connecting block and the circuit board are both fixed on the handle inner cavity, and the handle inner cavity is fixed in the handle sleeve; one end of the spring is sleeved on the upper spring lock wire, the upper spring lock wire is connected with the spool, the other end of the spring is sleeved on the lower spring lock wire, and the lower spring lock wire is connected with the connecting block; the capacitive sensing wire is characterized in that two capacitive sensing wires are parallel to each other, the two capacitive sensing wires are parallel to the grounding measuring rod, the capacitive sensing wires sequentially penetrate through a central hole in the spool after converging on the spool, the upper spring locking wire, the spring, the connecting block and the lower spring locking wire, one end of the capacitive sensing wire is looped through one end of the grounding measuring rod, and the other end of the capacitive sensing wire is connected with the circuit board. The invention can solve the problem that the acquisition accuracy is affected due to the electromagnetic interference and voltage loss in the long-distance signal transmission process.
The above-mentioned published patent documents are greatly different from the present patent application by comparison of technical features.
Therefore, in the hydraulic test with a large scale, how to find a high-precision wave height sensor suitable for a wide range condition becomes a technical problem facing the person skilled in the art.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide the wide-range resistance type wave height sensor which is reasonable in design, simple in structure and high in measurement accuracy.
The invention solves the technical problems by adopting the following technical scheme:
the wide-range resistance type wave height sensor comprises an upper tensioning frame and a lower tensioning frame, wherein two parallel resistance electrodes are fixedly connected between the upper tensioning frame and the lower tensioning frame and connected with a detection circuit; the two parallel resistance electrodes are made of an integral steel wire rope, the middle part of the integral steel wire rope is hinged on the lower tensioning frame, and two ends of the integral steel wire rope are hinged on the upper tensioning frame.
The end face and the bottom face of one side of the upper tensioning frame are of an open structure, a through hole for penetrating and installing a tensioning bolt is formed in the top of the upper tensioning frame, and the tensioning bolt penetrates through the through hole and is in threaded connection with an upper tensioning block arranged between the inner walls of the two sides of the upper tensioning frame; two upper insulating blocks are symmetrically embedded in the upper tensioning block in a left-right manner; the groove of the lower tensioning wheel arranged on the lower tensioning frame is wound around the middle part of the integral steel wire rope, and two ends of the integral steel wire rope are respectively arranged together with the two upper insulating blocks.
And the two parallel resistance electrodes are respectively penetrated in the grooves on the two upper insulating blocks, penetrate through the grooves and are fixed on the corresponding upper insulating blocks through the clamping rings.
And the lower tensioning frame is composed of a lower mounting plate and a rotating shaft fixedly mounted on the lower mounting plate, the front end of the rotating shaft is provided with threads for mounting a lower tensioning wheel, the lower tensioning wheel is connected with the rotating shaft on the lower tensioning frame through a shaft hole, the lower tensioning wheel is made of insulating materials, and a nut and a gasket for locking the lower tensioning wheel are coaxially mounted on the rotating shaft at the front end of the lower tensioning wheel.
And the upper tensioning frame and the lower tensioning frame are fixedly arranged on the water tank or the water tank wall through four expansion pipes respectively.
Moreover, the detection circuit includes: the device comprises an oscillator, a first V/A conversion module, a multiplier, a filtering module, an amplifying module and a second V/A conversion module; the output end of the oscillator is respectively connected with one input end of the first V/A conversion module and one input end of the multiplier, and the output end of the first V/A conversion module is connected with the other input end of the multiplier through a resistance electrode and is used for converting a sawtooth wave voltage signal output by the oscillator into a constant current signal and outputting the constant current signal to the multiplier through the resistance electrode; the output end of the multiplier is sequentially connected with the filtering module and the amplifying module and is used for carrying out filtering and amplifying treatment through the filtering module and the amplifying module after synthesizing the voltage signals output by the oscillator and the resistor electrode; the output end of the amplifying module is connected with the second V/A converting module and is used for converting the filtered and amplified voltage signals into current signals; the output end of the second V/A conversion module is connected with the upper computer and is used for remotely collecting the current signal output by the second V/A conversion module and processing and displaying the current signal in the upper computer.
The invention has the advantages and positive effects that:
1. the invention can be used for collecting the wave height which changes greatly in real time, when the upper tensioning bolt of the upper tensioning frame is rotated, the upper tensioning block moves upwards along with the upper tensioning bolt, so that the two ends of the integral steel wire rope arranged in the upper insulating block are tensioned, the straightness and the parallelism of the two resistance electrodes of the wave height sensor can be ensured even under the condition of large measuring range, and the measuring precision of the wide-range wave height sensor is further ensured; in addition, in the process of upwards moving the upper tensioning block to tension the steel wire, if the situation that the tensional degrees of the two resistance electrodes at the two sides of the lower tensioning wheel are inconsistent occurs, the straightness and parallelism of the two resistance electrodes can be automatically adjusted through free rotation of the lower tensioning wheel, the measurement precision of the wide-range wave height sensor is further ensured, and multiple tests prove that the measurement range of the wide-range resistance wave height sensor can reach 8-10m.
2. The two parallel resistance electrodes (namely, two ends of the integral steel wire rope) are penetrated in the grooves on the upper insulating blocks, the upper ends of the two parallel resistance electrodes penetrate through the grooves and are fixed on the corresponding upper insulating blocks through the clamping rings, and the clamping rings are used for locking the resistance electrodes (namely, two ends of the integral steel wire rope) so as to prevent the resistance electrodes from falling out of the corresponding upper insulating blocks.
3. The nut and the gasket for locking the lower tensioning wheel are coaxially arranged on the rotating shaft at the front end of the lower tensioning wheel, so that the lower tensioning wheel is prevented from falling off from the rotating shaft of the lower tensioning frame in the rotating process.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a cross-sectional view of FIG. 1;
FIG. 3 is a block diagram of a detection circuit of the present invention;
fig. 4 is a schematic diagram of the connection of a current source to a resistive electrode.
Detailed Description
Embodiments of the invention are described in further detail below with reference to the attached drawing figures:
the wide-range resistance type wave height sensor comprises an upper tensioning frame 1 and a lower tensioning frame 5 which are fixedly arranged on the wall of a water tank or a large-scale wave pushing plate, wherein two parallel resistance electrodes are fixedly connected between the upper tensioning frame and the lower tensioning frame and are connected with a detection circuit; the two parallel resistance electrodes are made of an integral steel wire rope, the middle part of the integral steel wire rope is hinged on the lower tensioning frame, and two ends of the integral steel wire rope are hinged on the upper tensioning frame.
The end face and the bottom face of one side of the upper tensioning frame are of an open structure, a through hole for penetrating the tensioning bolt 2 is formed in the top of the tensioning frame, the tensioning bolt penetrates through the through hole and is in threaded connection with an upper tensioning block 9 arranged between the inner walls of the two sides of the upper tensioning frame, and when the tensioning bolt is rotated, the upper tensioning block can move upwards along the inner walls of the two sides of the upper tensioning frame; two upper insulating blocks 11 are symmetrically embedded in the upper tensioning block in a left-right manner; the two parallel resistance electrodes are made of one integral steel wire rope 4, the middle part of the integral steel wire rope bypasses the groove of the lower tensioning wheel 8 arranged on the lower tensioning frame, two ends of the integral steel wire rope are respectively arranged together with the two upper insulating blocks, when the upper tensioning blocks move upwards, the two parallel resistance electrodes (two ends of the integral steel wire rope) bypassing the lower tensioning wheel are tensioned, and the two ends of the steel wire rope can ensure that the steel wires on two sides of the lower tensioning wheel are parallel when being tensioned.
In this embodiment, the two parallel resistor electrodes (two ends of the integral wire rope) are respectively inserted into the grooves on the two upper insulating blocks, and two ends of the integral wire rope pass through the grooves and are fixed on the corresponding upper insulating blocks through the clamping rings 10, and the clamping rings are used for locking the wire to prevent the wire from falling out of the upper insulating blocks.
In this embodiment, the lower tensioning frame 5 is composed of a lower mounting plate 5-1 and a rotating shaft 5-2 fixedly mounted on the lower mounting plate, a screw thread for mounting a lower tensioning wheel is arranged at the front end of the rotating shaft, the lower tensioning wheel is connected with the rotating shaft on the lower tensioning frame through a shaft hole, the lower tensioning wheel is made of insulating materials, and a nut 6 and a gasket 7 for locking the lower tensioning wheel are coaxially mounted on the rotating shaft at the front end of the lower tensioning wheel, so that the lower tensioning wheel is prevented from falling off from the rotating shaft of the lower tensioning frame in the left-right rotation process.
In this embodiment, the upper and lower tensioning frames are respectively fixed on the water tank or the water tank wall through four expansion pipes 3.
In this embodiment, the detection circuit is shown in fig. 3, and includes an oscillator, a first V/a conversion module, a multiplier, a filtering module, an amplifying module, and a second V/a conversion module;
the output end of the oscillator is respectively connected with one input end of the first V/A conversion module and one input end of the multiplier, and the output end of the first V/A conversion module is connected with the other input end of the multiplier through a resistance electrode and is used for converting a sawtooth wave voltage signal output by the oscillator into a constant current signal and outputting the constant current signal to the multiplier through the resistance electrode; the output end of the multiplier is sequentially connected with the filtering module and the amplifying module and is used for carrying out filtering and amplifying treatment through the filtering module and the amplifying module after synthesizing the voltage signals output by the oscillator and the resistor electrode; the output end of the amplifying module is connected with the second V/A converting module and is used for converting the filtered and amplified voltage signals into current signals; the output end of the second V/A conversion module is connected with the acquisition card at the upper computer side through a communication cable and is used for remotely acquiring the current signal output by the second V/A conversion module and processing and displaying the current signal in the upper computer.
The following describes the functions of each module in the detection circuit in detail:
(1) Oscillator
Because water can produce polarization effect when being electrified, the resistance value continuously changes, and the measurement is influenced. Thus, the oscillator is used to output a sawtooth wave as a measurement power source to eliminate the effect of water polarization.
(2) First V/A conversion module
The voltage source is converted into a current source, so that detection is facilitated, and a current waveform is output after conversion.
(3) Resistance electrode
As shown in fig. 4, a current source is applied to the resistive electrode, and thus the voltage value output by the resistive electrode is only related to the resistance value of the resistive electrode, and the resistive electrode outputs a voltage waveform.
(4) Multiplier unit
The oscillator and the resistor electrode output voltage waveforms to the multiplier, respectively, the voltage signals output by the oscillator and the resistor electrode are synthesized by the multiplier, and after multiplication, the voltage waveforms after the change are output.
(5) Filtering and amplifying module
In practice, the voltage waveform (square wave) may not be very regular and may not be "right-angled", and thus, the voltage waveform pattern after the change is output after the filtering process and the voltage signal is amplified.
(6) Second V/A conversion module
The method is used for converting the amplified voltage signal into a current signal, is favorable for long-distance transmission, and has strong anti-interference capability for current transmission.
The working principle of the invention is as follows:
the steel wire is wound around the groove of the lower tensioning wheel, and two ends of the steel wire are respectively penetrated through the grooves on the two upper insulating blocks and then clamped by the two clamping rings. After the steel wire is installed, the tensioning bolt is rotated clockwise, and the upper tensioning block moves upwards under the action of the threads, so that the two ends of the steel wire are tensioned, and the lower tensioning wheel can freely rotate around the rotating shaft on the lower tensioning frame in the process of tensioning the steel wire, so that the two steel wires on the two sides of the rotating shaft are straightened and kept parallel.
In the wave test, the lower tension frame and part of the steel wire are placed below the water level 12, and the resistance value of the steel wire is changed linearly along with the change of the depth of the steel wire immersed in water.
It should be emphasized that the examples described herein are illustrative rather than limiting, and therefore the invention includes, but is not limited to, the examples described in the detailed description, as other embodiments derived from the technical solutions of the invention by a person skilled in the art are equally within the scope of the invention.
Claims (5)
1. The wide-range resistance type wave height sensor comprises an upper tensioning frame and a lower tensioning frame, wherein two parallel resistance electrodes are fixedly connected between the upper tensioning frame and the lower tensioning frame and connected with a detection circuit; the method is characterized in that: the two parallel resistance electrodes are made of an integral steel wire rope, the middle part of the integral steel wire rope is hinged on the lower tensioning frame, and the two ends of the integral steel wire rope are hinged on the upper tensioning frame;
the end face and the bottom face of one side of the upper tensioning frame are of an open structure, a through hole for penetrating a tensioning bolt is formed in the top of the upper tensioning frame, and the tensioning bolt penetrates through the through hole and is in threaded connection with an upper tensioning block arranged between the inner walls of the two sides of the upper tensioning frame; two upper insulating blocks are symmetrically embedded in the upper tensioning block in a left-right manner; the middle part of the integral steel wire rope bypasses a groove of a lower tensioning wheel arranged on a lower tensioning frame, and two ends of the integral steel wire rope are respectively arranged together with the two upper insulating blocks;
when the upper tensioning block moves upwards, two parallel resistor electrodes bypassing the lower tensioning wheel are tensioned, and the two ends of the steel wire are tensioned, and the steel wires at the two sides of the lower tensioning wheel are parallel to each other.
2. A wide range resistive wave height sensor according to claim 1, wherein: the two parallel resistance electrodes are respectively arranged in the grooves on the two upper insulating blocks in a penetrating way, and the two parallel resistance electrodes pass through the grooves and are fixed on the corresponding upper insulating blocks through the clamping rings.
3. A wide range resistive wave height sensor according to claim 1 or 2, characterized in that: the lower tensioning frame is composed of a lower mounting plate and a rotating shaft fixedly mounted on the lower mounting plate, threads for mounting a lower tensioning wheel are formed at the front end of the rotating shaft, the lower tensioning wheel is connected with the rotating shaft on the lower tensioning frame through a shaft hole, the lower tensioning wheel is made of insulating materials, and a nut and a gasket for locking the lower tensioning wheel are coaxially mounted on the rotating shaft at the front end of the lower tensioning wheel.
4. A wide range resistive wave height sensor according to claim 1 or 2, characterized in that: the upper tensioning frame and the lower tensioning frame are fixedly arranged on the water tank or the water tank wall through four expansion pipes respectively.
5. A wide range resistive wave height sensor according to claim 1 or 2, characterized in that: the detection circuit includes: the device comprises an oscillator, a first V/A conversion module, a multiplier, a filtering module, an amplifying module and a second V/A conversion module; the output end of the oscillator is respectively connected with one input end of the first V/A conversion module and one input end of the multiplier, and the output end of the first V/A conversion module is connected with the other input end of the multiplier through a resistance electrode and is used for converting a sawtooth wave voltage signal output by the oscillator into a constant current signal and outputting the constant current signal to the multiplier through the resistance electrode; the output end of the multiplier is sequentially connected with the filtering module and the amplifying module and is used for carrying out filtering and amplifying treatment through the filtering module and the amplifying module after synthesizing the voltage signals output by the oscillator and the resistor electrode; the output end of the amplifying module is connected with the second V/A converting module and is used for converting the filtered and amplified voltage signals into current signals; the output end of the second V/A conversion module is connected with the upper computer and is used for remotely collecting the current signal output by the second V/A conversion module and processing and displaying the current signal in the upper computer.
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