CN209820491U - Online calibration system of hydrostatic level - Google Patents
Online calibration system of hydrostatic level Download PDFInfo
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- CN209820491U CN209820491U CN201920617094.5U CN201920617094U CN209820491U CN 209820491 U CN209820491 U CN 209820491U CN 201920617094 U CN201920617094 U CN 201920617094U CN 209820491 U CN209820491 U CN 209820491U
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Abstract
The utility model discloses an on-line calibration system of a static level, which is used for measuring and calibrating a working level; the standard displacement measuring device comprises a standard displacement generating device, a reference level, a water tank, a water separator and a data acquisition unit; installing a standard displacement generating device on a measuring site, fixing a reference level on the standard displacement generating device, and connecting a water tank, a working level and the reference level through a water separator; the height of the standard displacement generating device is slowly adjusted in the vertical direction in sequence, and after the system is stabilized, the readings of the working level gauge, the reference level gauge and the standard displacement generating device are measured through the data acquisition unit; and calculating according to the plurality of groups of measurement data to give a calibration coefficient of the working level gauge to be calibrated. The system has the advantages of simple calibration principle and simple integral operation, can realize the online calibration of the on-site working level gauge which cannot be detached, also can perform the indoor calibration of the off-line level gauge, and is matched with the regulation of the standard displacement generating device, so that the measurement precision is very high.
Description
Technical Field
The utility model relates to a calibration measurement technical field, more specifically the online calbiration system of hydrostatic level that says so relates to a hydrostatic level also is applicable to the indoor calibration of hydrostatic level off-line.
Background
Hydrostatic level is a precision level measurement system designed to measure the relative settlement of two or more measurement points. The energy leveling system is based on the use principle of the communicating vessel, the liquid level of the system always keeps horizontal static force characteristic under the condition of no static force, the settlement 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 the measuring instrument. Typically, such level changes are measured by vibrating wire force transducers or other devices that operate on the principles of LVDT.
The static leveling system is widely applied to large-scale projects such as nuclear power, dams, bridges and tunnels and civil buildings. According to the requirements of the national metrology and the requirements of the structural safety assessment of important projects, the static level needs to be calibrated periodically in order to check the measurement precision of the static level. According to the engineering use requirements, the leveling system is temporarily used, such as a bridge acceptance load test; the method is also used permanently, such as monitoring the non-uniform settlement whole life of the common raft foundation of the nuclear island containment vessel of the nuclear power station; when in use, the dam is mostly fixed on a dam body, a pier or a supporting frame thereof, and is mostly pre-embedded in concrete for permanent use. These levels, in particular permanently fixed levels, on the one hand cannot be removed for indoor calibration due to embedding in concrete, and on the other hand, the equipment calibration cannot be carried out off-line due to the requirements of continuity of the measurement. Therefore, the field use of the level at present belongs to a blind state, the field of field calibration is completely blank, the field calibration of the level is called for by the need of nuclear power safety supervision, and the development of the on-line calibration device of the hydrostatic level is facilitated.
The basic structure of the existing static level used by domestic nuclear power is shown in figure 1, and the built static level system is shown in figure 2. The static force level gauge has water inlet in the lower part, air outlet in the upper part, force sensor for measuring the height change of liquid level in the upper part, floating barrel in the middle part and liquid level scale pipe outside the floating barrel for observing the water level inside the box.
The measuring system constructed by two points or multiple points is a measuring system with two levels connected in series independently or with multiple levels connected in parallel, and fig. 2 shows a measuring system with two points connected in series. The lower water inlet realizes liquid flow intercommunication through the water separator, and similarly, the upper air outlet is interconnected and communicated with the environment, thereby forming a public communicated static liquid level.
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, the buoyancy of the floating barrel is increased, the buoyancy is in direct proportion to the change of the liquid level, and the following formula is met:
F＝V×ρ
wherein: f, buoyancy of the floating barrel; v-volume of liquid displaced by the object; ρ -the density of the liquid.
The vibrating wire type static level measuring system is a high-precision testing system designed according to the principle, and the system connects a plurality of level boxes into a system for measuring multipoint relative settlement. Vertical variations as small as 0.01mm can be accurately measured.
After the level is used for a long time, the performance of the level is degraded, the measurement precision is reduced, the current measurement data is reliable, the level can be continuously used for evaluating the safety performance of the structure, and the level and the system need to be calibrated on site.
However, the prior art does not relate to the field calibration of the static level, and currently, the calibration method basically stays in the laboratory calibration, and the calibration method comprises the following two methods:
firstly, a core measurement unit independent calibration mode: the method is characterized in that a measuring unit sensor is independently calibrated, for example, a vibrating wire type level measuring core unit adopts a vibrating wire type force sensor, a laboratory calibrates by applying a standard weight, and the working coefficient of the level is converted by characteristic parameters of a water storage tank. The method cannot check the overall performance of the measurement system, and the test precision is low.
Secondly, calibrating the whole system in a laboratory: the level is calibrated by designing a standard displacement generator. This method has not achieved on-site on-line verification.
Both of the above methods were performed in a laboratory. In view of the importance of nuclear power engineering, the current online inspection mode is as follows: an independent series system of the working box and the reference box is established through the water separator, water is added or reduced in the tank body of the reference box, the change of the liquid level is measured through a ruler or a height gauge, and then the change is compared with the reading of the sensor. The method is a qualitative method, the operation process is too complicated, the reading error is too large, the measurement precision is very low, and the aim of calibration cannot be achieved.
Therefore, how to provide a measurement system that can realize online calibration of a hydrostatic level and has high measurement accuracy is a problem that needs to be solved by those skilled in the art.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model provides an online calbiration system of hydrostatic level can be through the vertical displacement volume of accurate control benchmark level appearance to carry out online calibration to the work level appearance of volume of awaiting measuring through the data of gathering, convenient to use, easy operation, and measurement accuracy height.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the on-line calibration system of the static level is used for measuring and calibrating the sensor coefficients of one or a plurality of working levels simultaneously; the standard displacement measuring 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 gauge is fixed at the top of the standard displacement generating device;
the water tank, the working level gauge and the reference level gauge are arranged in the same horizontal plane;
the water separator is respectively connected with the water tank, the working level gauge and the reference level gauge through communicating pipes;
and the data acquisition unit is electrically connected with the signal output ends of the working level gauge, the standard displacement generation device and the reference level gauge respectively.
Through the technical scheme, the utility model discloses pass through the water knockout drum intercommunication with the on-the-spot work level of awaiting measuring with the benchmark level, adjust the height of the vertical direction of benchmark level through standard displacement generating device, and then measure and carry out the analytical calculation through data collection station to standard displacement generating device's displacement, work level and benchmark level's data, rate the coefficient of the sensor of work level. The whole operation is simple, the on-line calibration of the working level can be realized, and the measurement precision is high due to the adjustment of the standard displacement generating device.
Preferably, in the above online calibration system for the hydrostatic level, the reference level structurally comprises a housing, a floating barrel, a contact rod, a sensor and a liquid level graduated tube; a water inlet is formed in one side of the lower portion of the shell, an air outlet is formed in one side of the upper portion 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 unit; the liquid level graduated tube is located the casing outside and both ends communicate respectively about and the bottom and the top of casing. The reference level with the same structure as the working level is selected, so that dynamic measurement uniformity is facilitated.
Preferably, in the above-mentioned on-line calibration system for the hydrostatic level, the hydrostatic level may be a vibrating wire hydrostatic level (a buoy is suspended on a contact rod, and the position of the buoy is always kept constant), or may be another hydrostatic level (a buoy is suspended above a liquid level, and the position changes with the rise and fall of the liquid level).
Preferably, in the above online calibration system for a hydrostatic level, the standard displacement generating device includes 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 leveling support legs in the vertical direction; the bottom end of the fixed shaft is fixedly connected with the leveling support legs, the fixed shaft is positioned in the center 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 gauge 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 in the vertical direction along the fixed shaft; 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 collector. The utility model discloses a standard displacement generating device adopts lifting unit to carry out the ascending altitude mixture control of vertical side to the lifting disk, and in accommodation process, displacement sensor's probe all the time with the bottom surface contact of lifting disk, can highly measure the lift, simultaneously, because leveling stabilizer blade and displacement sensor are provided with a plurality ofly, not only can improve standard displacement generating device altitude mixture control's stability, can improve displacement data measurement's accuracy simultaneously, easy operation, it is convenient to use, and measurement accuracy is high.
Preferably, in the above online calibration system for a hydrostatic level, the lifting assembly includes a first flange, a screw rod, a driven bevel gear, a second flange, 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 rotatably connected with the first flange plate; the driven bevel gear is sleeved on the screw rod; a circular hole is formed in the side wall of the fixed shaft, and the second flange plate is fixed in the circular hole; the gear shaft of the driving 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 driving bevel gear; the driving bevel gear is meshed 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, then drives the sleeve to move up and down, and the stability and the easy controllability of gear transmission and thread transmission are utilized, so that the stability of movement is improved, and meanwhile, the adjustment and the control of a user are facilitated.
Preferably, in the above online calibration system for the hydrostatic level, the driving part of the lifting assembly is a rocking handle, and the rocking handle is fixedly connected to a gear shaft of the driving bevel gear. The user can directly realize the lift to the lifting disk through controlling the rocking handle externally.
Preferably, in the above online calibration system for the hydrostatic level, the number of the leveling support legs is 3, and a connection line between the leveling support legs and a connection point of the fixed shaft is an equilateral triangle. The triangular arrangement mode can guarantee the stability of the whole structure, the number of the displacement sensors can be increased, and the accuracy of displacement detection is improved.
Preferably, in the above online calibration system for the hydrostatic level, the displacement sensor is an LVDT sensor, and a free telescopic resilient probe is provided at a top end of the LVDT sensor. LVDT is an abbreviation of linear variable differential transformer, belonging to the linear displacement transducer. The method has the advantages of no friction measurement, infinite mechanical life, infinite resolution, zero repeatability, axial inhibition, firmness, durability, strong environmental adaptability and the like.
Preferably, in the above online calibration system for the hydrostatic level, the online calibration system further comprises a liquid level observation pipe, wherein the liquid level observation pipe is vertically arranged and is communicated with the water separator. The liquid level monitoring device is used for integrally observing the change condition of the liquid level outside the system, and is more convenient in the measurement calibration process.
Preferably, in the above online calibration system for a hydrostatic level, bearings are disposed between the first flange and the lead screw, and between the second flange and a gear shaft of the drive bevel gear. The bevel gear is smoother in rotation and higher in control performance by arranging the bearing.
It should be noted that the data collector may be composed of DT series or other high-precision data collectors and computers with effective measurement. Can be connected with leveling legs or other structures which do not influence measurement of the device, and can also be directly externally arranged on the site.
Furthermore, the calibration system and the calibration method can be used for sequentially carrying out online calibration on a single working level gauge through the on-off setting of the switch of the water separator, and can also be used for simultaneously calibrating the whole working level system at one time in the state of communicating all the working level gauges.
The utility model also provides a calibration method of the online calibration system of hydrostatic level appearance specifically includes following steps:
s1, horizontally installing the standard displacement generating device on a platform of a measuring site, fixing the reference level on the standard displacement generating device, leveling, and connecting the water tank, the working level and the reference level through a water distributor; connecting signal wires of the standard displacement generating device, the reference level and the working level with a data acquisition unit to form a measuring system;
s2, according to the calibration scheme, the height of the standard displacement generating device is slowly adjusted in the vertical direction in sequence, and after the system is stabilized, the readings of the working level gauge, the reference level gauge and the standard displacement generating device are measured through the data acquisition unit;
and S3, performing calculation analysis according to the measurement data, and giving out a calibration coefficient of the working level gauge to be calibrated.
Through the steps, during measurement operation, the standard displacement generating device is used for regulating vertical displacement in a single pass or in a reciprocating way, so that the reference level gauge generates vertical displacement, and the liquid level in a public system formed by the corresponding reference level gauge and the working level gauge is readjusted; the data acquisition unit simultaneously measures and reads the displacement of the standard displacement generating device, the reference level and the reading of the to-be-calibrated working level, and then calculates and calibrates through the formula, so that high-precision online calibration can be realized, and the operation is simple and the use is convenient.
Preferably, in the calibration method of the on-line calibration system for the hydrostatic level, the calibration coefficient G of the working level iswThe calculation formula of (2) is as follows:
ΔΗw＝(R0w-R1w)Gw-(R0sta-R1sta)Gsta；
wherein: Δ ΗwThe displacement of the standard displacement generating device;
R1wthe current reading of the liquid level of the working level gauge;
R0winitial reading of the working level gauge liquid level;
Gwthe coefficients of the sensors of the working level;
R1stacurrent reading of the level of the reference level;
R0stainitial reading of the level of the reference level;
gsta is the coefficient of the sensor of the reference level.
Wherein, is HwAnd when the value is a negative value, the settlement is shown, otherwise, the rising is shown when the value is a positive value, and because the data in the formula can be rapidly collected and measured by the data collector, and the precision is high, the measurement and calibration result is more accurate.
Can know via foretell technical scheme, compare with prior art, the utility model discloses an online calbiration system of hydrostatic level has following beneficial effect:
1. the utility model provides an among the calbiration system, pass through the water knockout drum intercommunication with the work level that benchmark level and scene volume were measured, adjust the height of the vertical direction of benchmark level through standard displacement generating device, and then carry out the analytical computation through data collection station to standard displacement generating device's displacement volume, work level and the measured data of benchmark level, the coefficient of the sensor of calibration work level. The whole operation is simple, the on-line calibration of the working level can be realized, and the measurement precision is high due to the adjustment of the standard displacement generating device.
2. The utility model discloses a standard displacement generating device adopts lifting unit to carry out the ascending altitude mixture control of vertical side to the lifting disk, and in accommodation process, displacement sensor's probe all the time with the bottom surface contact of lifting disk, can highly measure the lift, simultaneously, because leveling stabilizer blade and displacement sensor are provided with a plurality ofly, not only can improve standard displacement generating device altitude mixture control's stability, can improve displacement data measurement's accuracy simultaneously, easy operation, it is convenient to use, and measurement accuracy is high.
3. The lifting assembly controls the rotation of the screw rod through the two bevel gears which are meshed with each other, then drives the sleeve to move up and down, and the stability and the easy controllability of gear transmission and thread transmission are utilized, so that the stability of movement is improved, and meanwhile, the adjustment and the control of a user are facilitated.
4. The displacement sensor adopts an LVDT sensor, and has the advantages of no friction measurement, infinite mechanical life, infinite resolution, zero repeatability, axial inhibition, firmness, durability, strong environmental adaptability and the like.
5. The utility model provides a calbiration system not only can be used for the online calibration of work spirit level to measure, also can be used for the calibration measurement in the laboratory simultaneously, and application range is extensive.
6. The utility model provides a calibration system can be used for measuring the calibration to one or the sensor coefficient to a plurality of work spirit levels simultaneously, easy operation, availability factor height.
7. In the calibration method provided by the utility model, during the measurement operation, the standard displacement generating device is used to adjust the vertical displacement in a single pass or back and forth way, so that the reference level gauge generates vertical displacement, and the liquid level in the public system formed by the corresponding reference level gauge and the working level gauge is readjusted; the data acquisition unit simultaneously measures and reads the displacement of the standard displacement generating device, the reference level and the reading of the to-be-calibrated working level, and then calculates and calibrates through the formula, so that high-precision online calibration can be realized, and 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 required to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a measurement schematic diagram of a working 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 structural diagram of a calibration system provided by the present invention;
fig. 4 is a schematic structural diagram of a reference level provided by the present invention;
FIG. 5 is a cross-sectional view of a standard displacement generator according to the present invention;
FIG. 6 is a top view of the standard displacement generator of the present invention;
fig. 7 is a schematic diagram of electrical connection provided by the present invention.
Wherein:
1-a working level gauge;
2-standard displacement generating means;
22-leveling feet;
23-a fixed shaft;
24-a lifting platform;
241-a lifting disc; 242-a sleeve;
25-a lifting assembly;
251-a first flange; 252-a screw mandrel; 253-driven bevel gear; 254-a second flange; 255-
A drive bevel gear; 256-rocking handle; 257 — a bearing;
26-a displacement sensor;
27-leveling bolts;
3-a reference level;
31-a housing;
311-a water inlet; 312-an exhaust port;
32-a floating barrel;
33-contact rods;
34-a sensor;
35-liquid level graduated tube;
4-a water tank;
5-a water separator;
6-a data collector;
7-liquid level observation tube;
8-communicating pipe.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1 to 7, the embodiment of the present invention discloses an on-line calibration system for a hydrostatic level, which is used for measuring and calibrating the sensor coefficients of one or more working levels 1; the standard displacement measuring device comprises a standard displacement generating device 2, a reference level 3, a water tank 4, a water separator 5 and a data collector 6;
the standard displacement generating device 2 is installed 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, the working level 1 and the reference level 3 are arranged in the same horizontal plane;
the water distributor 5 is respectively connected with the water tank 4, the working level 1 and the reference level 3 through a communicating pipe 8;
the data acquisition unit 6 is respectively electrically connected with the signal output ends of the working level gauge 1, the standard displacement generating device 2 and the reference level gauge 3.
In order to further optimize the above technical solution, the reference level 3 includes a housing 31, a float barrel 32, a contact rod 33, a sensor 34 and a liquid level scale tube 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; a pontoon 32 is suspended within the casing 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 unit 6; the liquid level graduated tube 35 is located outside the casing 31 and the upper and lower ends of the liquid level graduated tube are respectively communicated with the bottom end and the top end of the casing 31.
It should be noted that the level has two main types in terms of the operating principle, one is suspension, the buoy has a heavier weight than the liquid, and the position suspended in the liquid is not changed, and the other is that the buoy has a heavier weight than the liquid, floats on the liquid surface, and the buoy is adjusted along with the rise and fall of the liquid surface.
In order to further optimize the technical scheme, the standard displacement generating device 2 comprises leveling support legs 22, a fixed shaft 23, a lifting platform 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 the working platform, and through holes are formed in the leveling support legs 22 in the vertical direction; 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 elevating table 24 includes an elevating plate 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 disposed in the fixed shaft 23 and is used for controlling the sleeve 242 to move in the vertical direction along the fixed shaft 23; the bottom end 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 unit 6.
In order to further optimize the above technical solution, the lifting assembly 25 includes a first flange 251, a screw 252, a driven bevel gear 253, a second flange 254, a drive 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 rotatably connected with the first flange 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 driving 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 driving bevel gear 255; the drive bevel gear 255 and the driven bevel gear 253 mesh.
In order to further optimize the above technical solution, the driving part of the elevating assembly 25 is a rocking handle 256, and the rocking handle 256 is fixedly connected with the gear shaft of the driving bevel gear 255.
In order to further optimize the above technical solution, the number of the leveling feet 22 is three, and the connecting line of the connecting points of the leveling feet 22 and the fixed shaft 23 is an equilateral triangle.
In order to further optimize the above technical solution, the displacement sensor 26 is an LVDT sensor, and the tip of the LVDT sensor has a free telescopic resilient probe.
In order to further optimize the technical scheme, the device also comprises a liquid level observation pipe 7, wherein the liquid level observation pipe 7 is vertically arranged and is communicated with the water separator 5.
In order to further optimize the above technical solution, bearings 257 are disposed between the first flange 251 and the lead screw 252, and between the second flange 254 and the gear shaft of the drive bevel gear 255.
In order to further optimize the above solution, the leveling feet 22 are fixed and leveled by leveling bolts 27.
The installation method of the embodiment comprises the following steps:
prior to testing, preparation of field calibration materials, equipment and tools is undertaken and the effective state of the reference level 3 and LVDT sensor is determined.
The LVDT sensor is mounted on the through hole of the leveling support leg 22, the sleeve 242 is in threaded connection with the lead screw 252, and the rocking handle 256 is shaken to move the lifting disc 241 downwards and make contact with the probe of the LVDT sensor. The appropriate stroke is determined so that the lift plate 241 always contacts the LVDT sensor probe when moving up and down.
The standard displacement generating device 2 mounted in place is fixed in place and leveled by means of leveling bolts 27.
And (3) installing a reference level 3 at the upper part of the standard displacement generating device 2 and leveling.
And installing a reference level 3 and a working level 1 pipeline, establishing an independent interconnected leveling system, opening a valve through a water tank 4 to enable the system to be filled with water to a proper height, and establishing a basic state of the test system.
And (3) constructing a measuring and reading system, connecting LVDT sensors of the working level 1, the reference level 3 and the standard displacement generating device 3 into a wiring terminal, connecting into the data acquisition unit 6, and starting a measuring and reading program. Data collector 6 may be comprised of DT85-G or other highly accurate data collector and computer that is effective in metering.
Recording initial data, setting several displacement strokes according to metering standard flow and recording corresponding measured data. And analyzing the processed data according to the measurement results.
The calibration method of the on-line calibration system of the static level disclosed by the embodiment specifically comprises the following steps:
s1, horizontally installing the standard displacement generating device 2 on a platform of a measuring site, fixing the reference level 3 on the standard displacement generating device 2, leveling, and connecting the water tank 4, the working level 1 and the reference level 3 through the water distributor 5; connecting signal lines of the standard displacement generating device 2, the reference level 3 and the working level 1 with the data acquisition unit 6 to form a measuring system;
s2, according to the calibration scheme, the height of the standard displacement generating device 2 is slowly adjusted in the vertical direction in sequence, and after the system is stabilized, the readings of the working level 1, the reference level 3 and the standard displacement generating device 2 are measured through the data acquisition unit 6;
and S3, performing calculation analysis according to the measurement data, and giving out a 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 iswThe calculation formula of (2) is as follows:
ΔΗw＝(R0w-R1w)Gw-(R0sta-R1sta)Gsta；
wherein: Δ ΗwThe displacement of the standard displacement generating device;
R1wthe current reading of the liquid level of the working level gauge;
R0winitial reading of the working level gauge liquid level;
Gwthe coefficients of the sensors of the working level;
R1stacurrent reading of the level of the reference level;
R0stainitial reading of the level of the reference level;
gsta is the coefficient of the sensor of the reference level.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
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 on-line calibration system for a hydrostatic level is used for measuring and calibrating the 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 collector (6);
the standard displacement generating device (2) is installed on a measuring site, and the standard displacement generating device (2) can move in the vertical direction;
the reference level (3) is fixed at the top of the standard displacement generating device (2);
the water tank (4) is arranged in the same horizontal plane with the working level gauge (1) and the reference level gauge (3);
the water distributor (5) is respectively connected with the water tank (4), the working level gauge (1) and the reference level gauge (3) through a communicating pipe (8);
and the data acquisition unit (6) is electrically connected with the signal output ends of the working level gauge (1), the standard displacement generation device (2) and the reference level gauge (3) respectively.
2. A hydrostatic level on-line calibration system according to claim 1, wherein the reference level (3) comprises a housing (31), a float bowl (32), a contact rod (33), a sensor (34) and a level scale tube (35); a water inlet (311) is formed in one side of the lower portion of the shell (31), an air outlet (312) is formed in one side of the upper portion 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 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 unit (6); the liquid level graduated tube (35) is positioned on the outer side of the shell (31), and the upper end and the lower end of the liquid level graduated tube are respectively communicated with the bottom end and the top end of the shell (31).
3. An on-line calibration system for a static level according to claim 1, characterized in that said standard displacement generating means (2) comprise 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 the working platform, and through holes are formed in the leveling support legs (22) in the vertical direction; 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 lifting platform (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 gauge (3) is fixed on the lifting disc (241), and the sleeve (242) is connected in the fixed shaft (23) in a sliding mode; the lifting assembly (25) is arranged in the fixed shaft (23) and is used for controlling the sleeve (242) to move in the vertical direction along the fixed shaft (23); the bottom end of the displacement sensor (26) is fixed in the through hole, a probe at the top end 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 collector (6).
4. A static level on-line calibration system according to claim 3 wherein the lifting assembly (25) comprises a first flange (251), a screw (252), a driven bevel gear (253), a second flange (254), a drive bevel gear (255) and a drive section; 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 rotatably connected with the first flange plate (251); the driven bevel gear (253) is sleeved on the screw rod (252); a round hole is formed in the side wall of the fixed shaft (23), and the second flange plate (254) is fixed in the round hole; a gear shaft of the driving 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 driving bevel gear (255); the driving bevel gear (255) and the driven bevel gear (253) are engaged.
5. A static level on-line calibration system according to claim 4 wherein the drive part of the lifting assembly (25) is a crank (256), the crank (256) being fixedly connected to the gear shaft of the drive bevel gear (255).
6. An on-line calibration system for a static level according to claim 3, characterized in that the number of said leveling legs (22) is 3, and the connecting line of the connecting points of said leveling legs (22) and said fixed shaft (23) is an equilateral triangle.
7. A level static on-line calibration system according to claim 3 wherein the displacement transducer (26) is an LVDT transducer having a free telescoping resilient probe at its tip.
8. An on-line calibration system for a static level according to claim 1, characterized in that it further comprises a level sight tube (7), said level sight tube (7) being vertically arranged and communicating with said water separator (5).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920617094.5U CN209820491U (en) | 2019-04-30 | 2019-04-30 | Online calibration system of hydrostatic level |
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| CN201920617094.5U CN209820491U (en) | 2019-04-30 | 2019-04-30 | Online calibration system of hydrostatic level |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110031021A (en) * | 2019-04-30 | 2019-07-19 | 中冶建筑研究总院有限公司 | A kind of hydrostatic level on-line calibration system and its calibration method |
| CN113622813A (en) * | 2021-08-09 | 2021-11-09 | 洛阳三旋智能装备有限公司 | Online calibrating device and method for prepressing of middle driver and clamping wheel of drill rod |
-
2019
- 2019-04-30 CN CN201920617094.5U patent/CN209820491U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110031021A (en) * | 2019-04-30 | 2019-07-19 | 中冶建筑研究总院有限公司 | A kind of hydrostatic level on-line calibration system and its calibration method |
| CN110031021B (en) * | 2019-04-30 | 2023-08-04 | 中冶建筑研究总院有限公司 | Online calibration system and method for static level |
| CN113622813A (en) * | 2021-08-09 | 2021-11-09 | 洛阳三旋智能装备有限公司 | Online calibrating device and method for prepressing of middle driver and clamping wheel of drill rod |
| CN113622813B (en) * | 2021-08-09 | 2023-12-19 | 洛阳三旋智能装备有限公司 | Online calibration device and calibration method for middle driver and clamping wheel pre-compression of drill rod |
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