CN110031021B - Online calibration system and method for static level - Google Patents
Online calibration system and method for static level Download PDFInfo
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- CN110031021B CN110031021B CN201910363183.6A CN201910363183A CN110031021B CN 110031021 B CN110031021 B CN 110031021B CN 201910363183 A CN201910363183 A CN 201910363183A CN 110031021 B CN110031021 B CN 110031021B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C25/00—Manufacturing, calibrating, cleaning, or repairing instruments or devices referred to in the other groups of this subclass
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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Abstract
The invention discloses an online calibration system and a calibration method of a static level, which are used for measuring and calibrating a working level; the device comprises a standard displacement generating device, a reference level, a water tank, a water separator and a data acquisition unit; the standard displacement generating device is arranged on a measuring site, the reference level is fixed on the standard displacement generating device, and the water tank, the working level and the reference level are connected through the water separator; the height of the standard displacement generating device is slowly adjusted in the vertical direction in sequence, and the readings of the working level, the reference level and the standard displacement generating device are measured through the data acquisition device after the system is stable; and calculating according to the plurality of groups of measurement data to give the calibration coefficient of the working level to be calibrated. The method has the advantages of simple calibration principle and simple integral operation, can realize on-line calibration of the on-site work level which cannot be detached, can also carry out indoor calibration of the off-line level, and has high measurement precision by matching with the adjustment of the standard displacement generating device.
Description
Technical Field
The invention relates to the technical field of calibration measurement, in particular to an online calibration system and a calibration method of a static level, which are also suitable for offline indoor calibration of the static level.
Background
A static level is a precision level measurement system designed to measure the relative sedimentation of two or more stations. The energy level system is characterized in that according to the use principle of the communicating vessel, the liquid level of the system always keeps horizontal static force under the condition of no pressure static force, the sedimentation change of each measuring point causes the change of the liquid level elevation of each measuring point in the system, and the liquid level elevation change is sensed by a measuring instrument. Typically such level change is measured by vibrating wire transducers or other devices operating on principles such as LVDTs.
The static leveling system is widely applied to large-scale projects such as nuclear power, dams, bridges, tunnels and the like and civil buildings. According to national metering requirements and the requirements of structural safety evaluation of major projects, the leveling instrument needs to be calibrated regularly for checking the measurement accuracy of the static leveling instrument. According to engineering use requirements, the leveling system is temporarily used, such as a bridge acceptance load test; permanent use is also available, such as monitoring of uneven settlement life time of a common raft of nuclear island containment of a nuclear power plant; the concrete pile is fixed on a dam body, a bridge pier or a supporting frame thereof when in use, and is pre-buried in concrete when in permanent use. These are in particular permanently fixed levels, which on the one hand cannot be taken out for indoor calibration due to the embedding in concrete and on the other hand are not allowed to be carried out offline due to the continuous requirements of the measurement. Therefore, the field use of the leveling instrument belongs to a blind state, the field calibration field is completely blank, the field calibration of the leveling instrument is brought forward by the need of nuclear power safety supervision, and an online calibration device of the static leveling instrument is developed.
The basic structure of the static level used for nuclear power in China at present is shown in figure 1, and the built static level system is shown in figure 2. The lower part of the static level gauge is a water inlet, the upper part of the static level gauge is an exhaust port, the uppermost part of the static level gauge is a force sensor for measuring the change of the liquid level, the middle of the static level gauge is a floating barrel, and a liquid level scale tube is arranged outside the static level gauge and can observe the water level in the box.
Two or more points are built into the measuring system, namely two leveling instruments are independently connected in series or a plurality of leveling instruments are connected in parallel, and the measuring system with two points connected in series is shown in fig. 2. The lower water inlet is communicated with liquid flow through the water separator, and likewise, the upper air outlet is connected with the environment, so that a commonly communicated static liquid level is formed.
The working principle of the vibrating wire type static level gauge is as follows: when an object is placed on the surface of a liquid, the buoyancy experienced by the object is related to the mass of liquid displaced by the object. When the liquid level rises, as shown in fig. 1, the buoyancy of the floating barrel is increased, the buoyancy is proportional to the change of the liquid level, and the following formula is satisfied:
F＝V×ρ
wherein: f, buoyancy of the floating barrel; v-volume of liquid displaced by the object; density of p-liquid.
A vibrating wire type static leveling system is a high-precision testing system designed according to the principle, and a plurality of leveling boxes are connected into a system for measuring multi-point relative sedimentation. Vertical variations as small as 0.01mm can be accurately measured.
Whether the performance of the leveling instrument is degraded after long-term use, whether the measurement accuracy is reduced, whether the current measurement data is reliable, whether the current measurement data can be continuously used for evaluating the structural safety performance, and the leveling instrument and the system need to be calibrated on site.
However, the prior art has not been directed to static level on-site calibration, and is currently basically still a laboratory calibration, and the calibration method covers the following two methods:
1. the core measurement unit is calibrated independently: for the independent calibration of the measuring unit sensor, such as a vibrating wire type level measuring core unit, a vibrating wire type force sensor is adopted, a laboratory is calibrated by applying a standard weight, and the working coefficient of the level is converted through the characteristic parameters of a water storage tank. This method cannot verify the overall performance of the measurement system and has low test accuracy.
2. System-wide laboratory calibration: the level is calibrated by designing a standard displacement generator. This approach has not achieved on-site online verification.
Both of the above methods are performed in a laboratory. In view of the importance of nuclear power engineering, the current on-line inspection mode is as follows: an independent series system of a working box and a reference box is established through the water separator, and the change of the liquid level is measured by a ruler or a height ruler through adding water or subtracting water into the tank body of the reference box and then is compared with the reading of a sensor. The method is only a qualitative method, the operation process is too complicated, the reading error is too large, the measurement accuracy is low, and the aim of calibration cannot be achieved.
Therefore, how to provide a measuring system and a measuring method thereof, which can realize online calibration of a static level and have high measuring accuracy, is a problem that needs to be solved by those skilled in the art.
Disclosure of Invention
In view of the above, the invention provides an online calibration system and a calibration method for a static level, which can accurately control the vertical displacement of a reference level, and can perform online calibration on a working level to be measured through collected data, and has the advantages of convenient use, simple operation and high measurement precision.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
an online calibration system of a static level is used for measuring and calibrating sensor coefficients of one or a plurality of working levels at the same time; the device comprises a standard displacement generating device, a reference level, a water tank, a water separator and a data acquisition unit;
the standard displacement generating device is arranged on a measuring site and can move in the vertical direction;
the reference level is fixed at the top of the standard displacement generating device;
the water tank is arranged in the same horizontal plane with the working level and the reference level;
the water separator is connected with the water tank, the working level gauge and the reference level gauge through communicating pipes respectively;
the data acquisition device is respectively and electrically connected with the working level, the standard displacement generation device and the signal output end of the reference level.
Through the technical scheme, the standard level is communicated with the working level to be measured on site through the water separator, the height of the standard level in the vertical direction is adjusted through the standard displacement generating device, and then the displacement of the standard displacement generating device, the data of the working level and the standard level are measured and analyzed and calculated through the data acquisition device, so that the coefficient of the sensor of the working level is calibrated. The whole operation is simple, can realize the online calibration to the work level, and owing to the regulation with the help of standard displacement generating device, measurement accuracy is high.
Preferably, in the online calibration system of a static level, the structure of the reference level comprises a shell, a float, a contact rod, a sensor and a liquid level scale tube; a water inlet is formed in one side of the lower part of the shell, an exhaust port is formed in one side of the upper part of the shell, and the water inlet is connected with the communicating pipe; the floating barrel is hung in the shell; the bottom end of the contact rod is connected with the top end of the floating barrel; the sensor is connected with the top end of the contact rod, and the signal output end of the sensor is electrically connected with the data acquisition device; the liquid level scale tube is positioned outside the shell, and the upper end and the lower end of the liquid level scale tube are respectively communicated with the bottom end and the top end of the shell. The uniformity of dynamic measurement is facilitated by selecting a reference level with the same structure as the working level.
Preferably, in the online calibration system of the static leveling instrument, the static leveling instrument can be a vibrating wire type static leveling instrument (a floating drum is suspended on a contact rod, and the position of the floating drum is always kept unchanged), or can be other types of static leveling instruments (the floating drum is suspended above the liquid level, and the position changes along with the lifting of the liquid level).
Preferably, in the online calibration system of a static level, the standard displacement generating device comprises a leveling support leg, a fixed shaft, a lifting table, a lifting assembly and a displacement sensor; the number of the leveling support legs is multiple, the bottom ends of the leveling support legs are supported on the working platform, and through holes are formed in the vertical direction of the leveling support legs; the bottom end of the fixed shaft is fixedly connected with the leveling support legs, the fixed shaft is positioned at the centers of the leveling support legs, and the fixed shaft is of a hollow structure; the lifting platform comprises a lifting disc and a sleeve; the sleeve is fixed on the bottom surface of the lifting disc, the reference level is fixed on the lifting disc, and the sleeve is connected in the fixed shaft in a sliding manner; the lifting assembly is arranged in the fixed shaft and is used for controlling the sleeve to move along the fixed shaft in the vertical direction; the bottom end of the displacement sensor is fixed in the through hole, a top probe of the displacement sensor is attached to the bottom surface of the lifting disc, and a signal output end of the displacement sensor is electrically connected with the data acquisition device. The standard displacement generating device adopts the lifting component to adjust the height of the lifting disc in the vertical direction, and in the adjusting process, the probe of the displacement sensor is always in contact with the bottom surface of the lifting disc, so that the lifting height can be measured, and meanwhile, as the leveling support legs and the displacement sensors are arranged in a plurality, the stability of the height adjustment of the standard displacement generating device can be improved, the accuracy of displacement data measurement can be improved, and the device is simple to operate, convenient to use and high in measurement accuracy.
Preferably, in the online calibration system of a static level, the lifting assembly comprises a first flange plate, a screw rod, a driven bevel gear, a second flange plate, a driving bevel gear and a driving part; the first flange plate is fixed at the bottom end of the fixed shaft; the screw rod is coaxially arranged with the fixed shaft and is in threaded connection with the inner wall of the sleeve, and the bottom end of the screw rod is rotationally connected with the first flange plate; the driven bevel gear is sleeved on the screw rod; the side wall of the fixed shaft is provided with a round hole, and the second flange plate is fixed in the round hole; the gear shaft of the drive bevel gear is rotationally connected in the second flange plate and extends out of the fixed shaft; the driving part is in transmission connection with a gear shaft of the drive bevel gear; the drive bevel gear meshes with the driven bevel gear. The lifting assembly controls the rotation of the screw rod through the two bevel gears which are meshed with each other, so that the sleeve is driven to move up and down, stability and operability of gear transmission and thread transmission are utilized, stability of movement is improved, and meanwhile, a user can adjust and control conveniently.
Preferably, in the above-mentioned online calibration system for a hydrostatic level, the driving part of the lifting assembly is a rocking handle, and the rocking handle is fixedly connected with a gear shaft of the drive bevel gear. The user can directly realize the lifting of the lifting disc through controlling the rocking handle at the outside.
Preferably, in the online calibration system for a static level, the number of the leveling feet is 3, and a connecting line of the leveling feet and a connecting point of the fixed shaft is in an equilateral triangle. The triangle-shaped's setting method can enough guarantee overall structure's stability, can increase displacement sensor's quantity again, improves displacement detection's degree of accuracy.
Preferably, in the online calibration system of a static level, the displacement sensor is an LVDT sensor, and a free telescopic rebound probe is arranged at the top end of the LVDT sensor. LVDTs are short for linear variable differential transformers, belonging to the linear displacement sensor. The device has the advantages of no friction measurement, infinite mechanical life, infinite resolution, zero position repeatability, axial restraint, firmness, durability, strong environmental adaptability and the like.
Preferably, in the online calibration system of a static level gauge, the online calibration system further comprises a liquid level observation tube, wherein the liquid level observation tube is vertically arranged and is communicated with the water separator. The system is used for integrally observing the change condition of the liquid level outside the system, and is more convenient in the process of measurement and calibration.
Preferably, in the above online calibration system for a static level, bearings are disposed between the first flange plate and the screw rod, and between the second flange plate and the gear shaft of the drive bevel gear. The bevel gear is smoother to rotate by arranging the bearing, and the control performance is stronger.
It should be noted that the data collector may be composed of DT series or other high-precision data collectors and computers with effective metering. The device can be connected with leveling support legs of the device or other structures which do not influence measurement, and can also be directly externally arranged on site.
Furthermore, the calibration system and the method can calibrate the whole working level system at one time under the state of setting all the working level meters to be communicated through the on-off setting of the switch of the water separator, besides carrying out on-line calibration on the single working level meter in sequence.
The invention also provides a calibration method of the online calibration system of the static level, which comprises the following steps:
s1, horizontally installing a standard displacement generating device on a platform of a measuring site, fixing a reference level on the standard displacement generating device, leveling, and connecting a water tank, a working level and the reference level through a water separator; the standard displacement generating device, the reference level and the signal wire of the working level are connected with the data acquisition device to form a measuring system;
s2, according to a calibration scheme, the heights of the standard displacement generating devices are slowly adjusted in the vertical direction in sequence, and after the system is stable, the readings of the working level, the reference level and the standard displacement generating devices are measured through the data collector;
and S3, performing calculation and analysis according to the measurement data, and giving out a calibration coefficient of the working level to be calibrated.
Through the steps, when in measurement operation, the standard displacement generating device is used for adjusting the up-down displacement in a single way or in a reciprocating way, so that the standard level gauge is vertically displaced, and the liquid level in a public system formed by the corresponding standard level gauge and the working level gauge is readjusted; the data acquisition device simultaneously measures and reads the displacement of the standard displacement generating device, the reference level and the reading of the working level to be calibrated, and then calculates and calibrates through a formula, so that high-precision online calibration work can be realized, the operation is simple, and the use is convenient.
Preferably, in the calibration method of the online calibration system for a hydrostatic level, the calibration coefficient G of the working level w The calculation formula of (2) is as follows:
ΔΗ w ＝(R 0w -R 1w )G w -(R 0sta -R 1sta )G sta ；
wherein: ΔH of w Displacement amount of the standard displacement generating device;
R 1w current reading of the working level;
R 0w initial reading of the working level;
G w coefficients of sensor of work level;
R 1sta current reading of reference level;
R 0sta initial reading of reference level;
gsta = coefficient of sensor of reference level.
Note that Δh w The data in the formula can be rapidly collected and measured through the data collector, and the accuracy is high, so that the measurement and calibration result is more accurate.
Compared with the prior art, the invention discloses an online calibration system and a calibration method for a static level, which have the following beneficial effects:
1. in the calibration system provided by the invention, a reference level is communicated with a working level to be measured on site through the water separator, the height of the reference level in the vertical direction is adjusted through the standard displacement generating device, and further the displacement of the standard displacement generating device, the working level and the measurement data of the reference level are analyzed and calculated through the data acquisition device, so that the coefficient of a sensor of the working level is calibrated. The whole operation is simple, can realize the online calibration to the work level, and owing to the regulation with the help of standard displacement generating device, measurement accuracy is high.
2. The standard displacement generating device adopts the lifting component to adjust the height of the lifting disc in the vertical direction, and in the adjusting process, the probe of the displacement sensor is always in contact with the bottom surface of the lifting disc, so that the lifting height can be measured, and meanwhile, as the leveling support legs and the displacement sensors are arranged in a plurality, the stability of the height adjustment of the standard displacement generating device can be improved, the accuracy of displacement data measurement can be improved, and the device is simple to operate, convenient to use and high in measurement accuracy.
3. The lifting assembly controls the rotation of the screw rod through the two bevel gears which are meshed with each other, so that the sleeve is driven to move up and down, stability and operability of gear transmission and thread transmission are utilized, stability of movement is improved, and meanwhile, a user can adjust and control conveniently.
4. The displacement sensor adopts an LVDT sensor, and has the advantages of no friction measurement, infinite mechanical life, infinite resolution, zero position repeatability, axial inhibition, firmness, durability, strong environmental adaptability and the like.
5. The calibration system provided by the invention not only can be used for online calibration measurement of the working level, but also can be used for calibration measurement in a laboratory, and has a wide application range.
6. The calibration system provided by the invention can be used for measuring and calibrating the sensor coefficients of one or a plurality of working level gauges at the same time, and has the advantages of simple operation and high use efficiency.
7. In the calibration method provided by the invention, during measurement operation, the standard displacement generating device is used for adjusting the up-down displacement in a single way or in a reciprocating way, so that the standard level gauge is vertically displaced, and the liquid level in a public system formed by the corresponding standard level gauge and the working level gauge is readjusted; the data acquisition device simultaneously measures and reads the displacement of the standard displacement generating device, the reference level and the reading of the working level to be calibrated, and then calculates and calibrates through a formula, so that high-precision online calibration work can be realized, the operation is simple, and the use is convenient.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic drawing of a measurement of a work level provided by the present invention;
FIG. 2 is a schematic view of a plurality of work level connections provided by the present invention;
FIG. 3 is a schematic diagram of a calibration system according to the present invention;
FIG. 4 is a schematic view of a reference level provided by the present invention;
FIG. 5 is a cross-sectional view of a standard displacement generating device provided by the present invention;
FIG. 6 is a top view of a standard displacement generating device provided by the present invention;
fig. 7 is a schematic view of an electrical connection provided by the present invention.
Wherein:
1-working level gauge;
2-standard displacement generating device;
22-leveling feet;
23-a fixed shaft;
24-lifting platform;
241-lifting disk; 242-sleeve;
25-a lifting assembly;
251-a first flange; 252-screw rod; 253—driven bevel gear; 254-a second flange; 255-
A drive bevel gear; 256-crank; 257-bearings;
26-a displacement sensor;
27-leveling bolts;
3-reference level;
31-a housing;
311-water inlet; 312-exhaust port;
32-floating barrels;
33-contact lever;
34-a sensor;
35-a liquid level scale tube;
4-a water tank;
5-a water separator;
6-a data collector;
7-a liquid level observation tube;
8-communicating pipe.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1:
referring to fig. 1 to 7, embodiments of the present invention disclose an online calibration system for a hydrostatic level for measuring and calibrating sensor coefficients of one or more working levels 1 simultaneously; comprises a standard displacement generating device 2, a reference level 3, a water tank 4, a water separator 5 and a data acquisition device 6;
the standard displacement generating device 2 is installed at a measuring site, and the standard displacement generating device 2 can move in a vertical direction;
the reference level 3 is fixed on the top of the standard displacement generating device 2;
the water tank 4 is arranged in the same horizontal plane with the working level 1 and the reference level 3;
the water separator 5 is respectively connected with the water tank 4, the working level 1 and the reference level 3 through the communicating pipe 8;
the data collector 6 is electrically connected with the signal output ends of the working level 1, the standard displacement generating device 2 and the reference level 3 respectively.
In order to further optimize the technical solution described above, the reference level 3 comprises a housing 31, a float 32, a contact lever 33, a sensor 34 and a level gauge 35; a water inlet 311 is formed in one side of the lower part of the shell 31, an air outlet 312 is formed in one side of the upper part of the shell 31, and the water inlet 311 is connected with the communicating pipe 8; the float bowl 32 is suspended in the housing 31; the bottom end of the contact rod 33 is connected with the top end of the float 32; the sensor 34 is connected with the top end of the contact rod 33, and the signal output end of the sensor 34 is electrically connected with the data acquisition device 6; the liquid level scale tube 35 is located outside the casing 31 and has upper and lower ends respectively connected to the bottom and top ends of the casing 31.
The level is mainly classified into two types in terms of working principle, one is that a pontoon is suspended, the pontoon is heavier than the liquid, the position suspended in the liquid is unchanged, the other is that the pontoon is heavier than the liquid and floats on the liquid surface, and the pontoon is regulated along with the lifting of the liquid surface.
In order to further optimize the technical proposal, the standard displacement generating device 2 comprises leveling feet 22, a fixed shaft 23, a lifting table 24, a lifting assembly 25 and a displacement sensor 26; the number of the leveling support legs 22 is multiple, the bottom ends of the leveling support legs 22 are supported on a working platform, and through holes are formed in the vertical direction of the leveling support legs 22; the bottom end of the fixed shaft 23 is fixedly connected with the leveling support legs 22, the fixed shaft 23 is positioned in the center of the leveling support legs 22, and the fixed shaft 23 is of a hollow structure; the lift table 24 includes a lift plate 241 and a sleeve 242; a sleeve 242 is fixed on the bottom surface of the lifting plate 241, the reference level 3 is fixed on the lifting plate 241, and the sleeve 242 is slidably connected in the fixed shaft 23; the lifting assembly 25 is disposed in the fixed shaft 23 and is used for controlling the sleeve 242 to move along the fixed shaft 23 in the vertical direction; the bottom of the displacement sensor 26 is fixed in the through hole, the top probe of the displacement sensor 26 is attached to the bottom surface of the lifting disc 241, and the signal output end of the displacement sensor 26 is electrically connected with the data acquisition device 6.
To further optimize the above technical solution, the lifting assembly 25 includes a first flange 251, a screw rod 252, a driven bevel gear 253, a second flange 254, a driving bevel gear 255 and a driving part; the first flange 251 is fixed at the bottom end of the fixed shaft 23; the screw rod 252 is coaxially arranged with the fixed shaft 23 and is in threaded connection with the inner wall of the sleeve 242, and the bottom end of the screw rod 252 is in rotary connection with the first flange 251; the driven bevel gear 253 is sleeved on the screw rod 252; the side wall of the fixed shaft 23 is provided with a round hole, and the second flange 254 is fixed in the round hole; the gear shaft of the drive bevel gear 255 is rotatably connected in the second flange 254 and extends out of the fixed shaft 23; the driving part is in transmission connection with a gear shaft of the drive bevel gear 255; the drive bevel gear 255 and the driven bevel gear 253 are meshed.
In order to further optimize the above technical solution, the driving part of the lifting assembly 25 is a rocking handle 256, and the rocking handle 256 is fixedly connected with the gear shaft of the drive bevel gear 255.
In order to further optimize the above technical solution, the number of leveling feet 22 is three, and the connection line of the connection points of the leveling feet 22 and the fixed shaft 23 is in an equilateral triangle.
In order to further optimize the above technical solution, the displacement sensor 26 is an LVDT sensor, and the top end of the LVDT sensor is provided with a freely telescopic rebound probe.
In order to further optimize the technical scheme, the water level device further comprises a liquid level observation pipe 7, wherein the liquid level observation pipe 7 is vertically arranged and communicated with the water separator 5.
In order to further optimize the above technical solution, bearings 257 are provided between the first flange 251 and the screw rod 252, and between the second flange 254 and the gear shaft of the drive bevel gear 255.
To further optimize the solution described above, the leveling feet 22 are fixed leveled by leveling bolts 27.
The installation method of the embodiment comprises the following steps:
the test is preceded by preparing the field calibration materials, equipment and tools and determining the effective status of the reference level 3 and LVDT sensors.
The LVDT sensor is mounted in a through hole in the leveling foot 22, the sleeve 242 is threaded with the lead screw 252, and the rocker 256 is rocked to move the lifting disk 241 downward and into contact with the probe of the LVDT sensor. The proper stroke is determined so that the lifting disk 241 always contacts the probe of the LVDT sensor as it moves up and down.
The standard displacement generating device 2 mounted in place is fixed in the field and leveled by the leveling bolts 27.
A reference level 3 at the upper part of the standard displacement generating device 2 is installed and leveled.
And installing pipelines of the reference level 3 and the working level 1, establishing an independent interconnection leveling system, opening a valve through the water tank 4 to fill water into the system to a proper height, and establishing a basic state of the test system.
And (3) constructing a measuring and reading system, connecting the LVDT sensors of the working level 1, the reference level 3 and the standard displacement generating device 3 to the wiring terminals, connecting to the data acquisition unit 6, and starting a measuring and reading program. The data collector 6 may be composed of DT85-G or other high precision data collectors and computers that are effective in metering.
Initial data are recorded, several shift strokes are set up according to a metering standard flow, and corresponding measurement data are recorded. And analyzing the processed data according to the measurement result.
Example 2:
the embodiment discloses a calibration method of an online calibration system of a static level, which specifically comprises the following steps:
s1, horizontally installing a standard displacement generating device 2 on a platform of a measuring site, fixing a reference level 3 on the standard displacement generating device 2, leveling, and connecting a water tank 4, a working level 1 and the reference level 3 through a water separator 5; the standard displacement generating device 2, the reference level 3 and the signal wire of the working level 1 are connected with the data collector 6 to form a measuring system;
s2, according to a calibration scheme, the heights of the standard displacement generating device 2 are slowly adjusted in the vertical direction in sequence, and after the system is stable, the readings of the working level gauge 1, the reference level gauge 3 and the standard displacement generating device 2 are measured through the data collector 6;
and S3, performing calculation and analysis according to the measurement data to give the calibration coefficient of the working level 1 to be calibrated.
In order to further optimize the above solution, the calibration factor G of the working level 1 w The calculation formula of (2) is as follows:
ΔΗ w ＝(R 0w -R 1w )G w -(R 0sta -R 1sta )G sta ；
wherein: ΔH of w Displacement amount of the standard displacement generating device;
R 1w current reading of the working level;
R 0w initial reading of the working level;
G w coefficients of sensor of work level;
R 1sta current reading of reference level;
R 0sta initial reading of reference level;
gsta = coefficient of sensor of reference level.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. An online calibration system of a static level is used for measuring and calibrating sensor coefficients of one or a plurality of working levels (1) at the same time; the device is characterized by comprising a standard displacement generating device (2), a reference level (3), a water tank (4), a water separator (5) and a data acquisition unit (6);
the standard displacement generating device (2) is arranged on a measuring site, and the standard displacement generating device (2) can move in the vertical direction;
the reference level (3) is fixed on the top of the standard displacement generating device (2);
the water tank (4) is arranged in the same horizontal plane with the working level (1) and the reference level (3);
the water separator (5) is connected with the water tank (4), the working level (1) and the reference level (3) through communicating pipes (8) respectively;
the data acquisition device (6) is respectively and electrically connected with the signal output ends of the working level (1), the standard displacement generation device (2) and the reference level (3);
the standard displacement generating device (2) comprises leveling support legs (22), a fixed shaft (23), a lifting table (24), a lifting assembly (25) and a displacement sensor (26); the number of the leveling support legs (22) is multiple, the bottom ends of the leveling support legs (22) are supported on a working platform, and through holes are formed in the vertical direction of the leveling support legs (22); the bottom end of the fixed shaft (23) is fixedly connected with the leveling support legs (22), the fixed shaft (23) is positioned at the centers of the leveling support legs (22), and the fixed shaft (23) is of a hollow structure; the lifting table (24) comprises a lifting disc (241) and a sleeve (242); the sleeve (242) is fixed on the bottom surface of the lifting disc (241), the reference level (3) is fixed on the lifting disc (241), and the sleeve (242) is slidably connected in the fixed shaft (23); the lifting assembly (25) is arranged in the fixed shaft (23) and is used for controlling the sleeve (242) to move along the fixed shaft (23) in the vertical direction; the bottom end of the displacement sensor (26) is fixed in the through hole, a top end probe of the displacement sensor (26) is attached to the bottom surface of the lifting disc (241), and a signal output end of the displacement sensor (26) is electrically connected with the data acquisition device (6);
the water distributor also comprises a liquid level observation tube (7), wherein the liquid level observation tube (7) is vertically arranged and is communicated with the water distributor (5).
2. A hydrostatic level online calibration system according to claim 1, characterized in that the reference level (3) comprises a housing (31), a float (32), a contact lever (33), a sensor (34) and a level gauge tube (35); a water inlet (311) is formed in one side of the lower part of the shell (31), an exhaust port (312) is formed in one side of the upper part of the shell (31), and the water inlet (311) is connected with the communicating pipe (8); the floating barrel (32) is hung in the shell (31); the bottom end of the contact rod (33) is connected with the top end of the floating barrel (32); the sensor (34) is connected with the top end of the contact rod (33), and the signal output end of the sensor (34) is electrically connected with the data acquisition device (6); the liquid level scale tube (35) is positioned at the outer side of the shell (31) and the upper end and the lower end of the liquid level scale tube are respectively communicated with the bottom end and the top end of the shell (31).
3. The online calibration system of a hydrostatic level of claim 1, wherein the lifting assembly (25) comprises a first flange plate (251), a screw (252), a driven bevel gear (253), a second flange plate (254), a drive bevel gear (255), and a drive portion; the first flange plate (251) is fixed at the bottom end of the fixed shaft (23); the screw rod (252) is coaxially arranged with the fixed shaft (23) and is in threaded connection with the inner wall of the sleeve (242), and the bottom end of the screw rod (252) is rotationally connected with the first flange plate (251); the driven bevel gear (253) is sleeved on the screw rod (252); a circular hole is formed in the side wall of the fixed shaft (23), and the second flange plate (254) is fixed in the circular hole; the gear shaft of the drive bevel gear (255) is rotatably connected in the second flange plate (254) and extends out of the fixed shaft (23); the driving part is in transmission connection with a gear shaft of the drive bevel gear (255); the drive bevel gear (255) and the driven bevel gear (253) are meshed.
4. A hydrostatic level online calibration system according to claim 3, wherein the drive portion of the lifting assembly (25) is a crank (256), the crank (256) being fixedly connected to a gear shaft of the drive bevel gear (255).
5. A system for on-line calibration of a static level according to claim 1, characterized in that the number of leveling feet (22) is 3 and that the connection of the leveling feet (22) to the connection point of the fixed shaft (23) is in the shape of an equilateral triangle.
6. A hydrostatic level online calibration system according to claim 1, wherein the displacement sensor (26) is an LVDT sensor having a free telescoping rebound probe at its tip.
7. A method of calibrating an online calibration system for a hydrostatic level according to any of claims 1-6, comprising in particular the steps of:
s1, horizontally installing a standard displacement generating device (2) on a platform of a measuring site, fixing a reference level (3) on the standard displacement generating device (2) and leveling, and connecting a water tank (4), a working level (1) and the reference level (3) through a water separator (5); the signal wires of the standard displacement generating device (2), the reference level (3) and the working level (1) are connected with the data acquisition device (6) to form a measuring system;
s2, according to a calibration scheme, the heights of the standard displacement generating device (2) are slowly adjusted in the vertical direction in sequence, and after the system is stable, the readings of the working level (1), the reference level (3) and the standard displacement generating device (2) are measured through the data collector (6);
and S3, performing calculation and analysis according to the measurement data to give a calibration coefficient of the working level (1) to be calibrated.
8. A static level according to claim 7A calibration method for an on-line calibration system is characterized in that the calibration coefficient G of a working level (1) w The calculation formula of (2) is as follows:
ΔΗ w ＝(R 0w -R 1w )G w -(R 0sta -R 1sta )G sta ；
wherein: ΔH of w Displacement amount of the standard displacement generating device: the standard displacement generating device moves upwards by positive number and moves downwards by negative number;
R 1w current reading of the working level;
R 0w initial reading of the working level;
G w sensor coefficients of the working level;
R 1sta current reading of reference level;
R 0sta initial reading of reference level;
gsta = sensor coefficient of the reference level.
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| CN110285837B (en) * | 2019-07-22 | 2023-10-27 | 湖南省计量检测研究院 | Differential pressure type static level calibrating device and calibrating method |
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| CN112964225B (en) * | 2021-02-04 | 2023-09-08 | 上海隧道工程有限公司 | Sedimentation detection system with leveling function and leveling method thereof |
| CN113255643A (en) * | 2021-05-08 | 2021-08-13 | 上海砼测检测技术有限公司 | Machine vision recognition algorithm applied to displacement monitoring |
| CN113432625A (en) * | 2021-07-09 | 2021-09-24 | 安徽创谱仪器科技有限公司 | Calibration system and calibration method of hydrostatic level |
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