CN104296633B - Waveguide tube length measuring device for radar liquid level meter and measuring method thereof - Google Patents
Waveguide tube length measuring device for radar liquid level meter and measuring method thereof Download PDFInfo
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- CN104296633B CN104296633B CN201410606049.1A CN201410606049A CN104296633B CN 104296633 B CN104296633 B CN 104296633B CN 201410606049 A CN201410606049 A CN 201410606049A CN 104296633 B CN104296633 B CN 104296633B
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Abstract
The invention discloses a waveguide tube length measuring device for a radar liquid level meter. The waveguide tube length measuring device comprises a horizontal lathe, a digital micrometer with a communicating module, a sliding box and a computer, wherein the sliding box is provided with a three-axis grating ruler and a communicating module of the three-axis grating ruler. The digital micrometer and the three-axis grating ruler are connected with the computer for data transmission. A guide rail of the horizontal lathe is provided with a height adjustable support. The invention discloses a measuring method using the device. The measuring device has the advantages that the measuring process is automatic, the production efficiency is greatly improved, and therefore the batch production requirement is met; the measuring device can adapt to waveguide tubes different in length, and repeated development work is reduced; the measuring precision is high, repeatability is good, and the influence of artificial factors is reduced to the greatest extent; a database is adopted for recording measuring data, and therefore the traceability of products can be improved.
Description
Technical field
The present invention relates to a kind of liquefied natural gas radar level gauge guide length measurement apparatus and its measuring method.
Background technology
Progress with human society and economic fast development, today's society is more and more vigorous to the demand of the energy.Liquid
Change natural gas as a kind of cleaning, the efficient energy, using increasingly extensive, the volume of trade in the whole world is also increasing.Radar waveguide
Pipe is used in the elevation carrection of liquified natural gas tank body fluid position, and it provides direction propagation structure, many waveguide Gutron for electromagnetic wave
Cross flange to be spliced together, the Teflon piece at node can provide the reference point of length determination for radar range finding.Just because of such as
This, the length accuracy of waveguide has direct impact to the precision of radar level gauge.
There are following technological difficulties in the measurement of existing guide length:
1) control of ambient temperature and measurement: the material of waveguide is rustless steel, because the reason length, waveguide is not
The length change of the accumulation under synthermal is very big, in order to ensure the effectiveness of linear measure longimetry, needs, when measuring length, to keep
Room temperature is at 20 ± 1 DEG C；
2) measurement of length: the certainty of measurement of waveguide requires within ± 0.1mm, because the length of waveguide is up to
6m about, with existing survey tool, it is good at drawing accurate length by the method for direct observation；
3) integration of data, process: manually operate, in order to reduce, the error that may bring, measuring system requires, automatically complete
Become processing, the calculating of data, automatically measurement data and final result are stored in the data base of far-end, and are being measured
Afterwards, automatically generate the measurement report of product；
4) placement of waveguide when measuring: because waveguide is longer, need to select a kind of suitable laying method, reducing should
Place the improper generation impact to certainty of measurement for the deformation.
Content of the invention
Goal of the invention: for the problems referred to above, it is an object of the invention to provide a kind of precision instrumentation radar liquidometer waveguide
The device of length of tube, provides the method measuring using this device it is ensured that the precision of radar level gauge simultaneously.
Technical scheme: a kind of radar level gauge guide length measurement apparatus, including inclusion horizontal lathe, thousand points of numeral
Chi, slip crate, computer, described digital micrometer has communication module, and described slip crate has three axle grating scales and its communication
Module, described digital micrometer, described three axle grating scales are connected with described computer and carry out data transmission, described horizontal lathe
Brackets with height-adjustable is provided with guide rail.
Described brackets with height-adjustable at least two, and be equidistantly uniformly arranged, reduce deformation to measuring accuracy as far as possible
Impact.
The x-axis of described three axle grating scales is parallel with the direct of travel of described slip crate with z-axis direction, described digital micrometer
It is fixed on the z-axis platform of described slip crate, the thimble telescopic direction of described digital micrometer is parallel with z-axis.
A kind of method carrying out linear measure longimetry to radar level gauge with waveguide using above-mentioned measurement apparatus, including following
Step:
(1) choose a waveguide as standard pipe, record its essence at being 20 ± 0.5 DEG C in temperature t in authoritative department
Really length, and the thermal coefficient of expansion by known materials, calculates it in actual temperature t1Under length；
(2) waveguide is installed: standard pipe lies on horizontal lathe, and two ends are fixed, and centre is propped up by brackets with height-adjustable
Support；
(3) standard pipe calibration: install standard pipe, by a certain fixed bit of digital micrometer thimble alignment criteria pipe flange
Put, rotate slip crate z-axis rocking handle by digital micrometer to standard pipe direction precession 10.00mm, then pass through computer to three axles
Grating scale and digital micrometer are zeroed simultaneously, and now the reading of three axle grating scales is zero, i.e. the relative displacement of standard pipe is zero；
(4) treat that test tube measures: removal standard pipe, change and treat test tube, rotate slip crate z-axis rocking handle by digital micrometer thimble
To treating the precession of test tube direction until its reading is zero, will treat that test tube is rotated in a clockwise direction a circle, digital micrometer is used for counting
Calculate the little deviation of pipe, computer takes arithmetic mean of instantaneous value to the minor variations brought because of rotation, now three axle grating scale x-axis, z
The arithmetic mean of instantaneous value sum of axle reading and digital micrometer reading as treats the length difference of test tube and standard pipe；
(5) length of tube to be measured is calculated by formula.
Measuring environment room temperature controls at 20 ± 1 DEG C.
Beneficial effect: compared with prior art, it is an advantage of the invention that measurement process automatization, be greatly enhanced production effect
Rate, to adapt to batch production requirements；It is suitable for the waveguide of different length, reduce overlapping development work；Certainty of measurement is high, repetition
Property good, as far as possible reduce artifact impact；Using data-base recording test data, increase the trackability of product.
Brief description
Fig. 1 is the hardware connection diagram of measurement apparatus of the present invention.
Specific embodiment
Below in conjunction with the accompanying drawings and specific embodiment, it is further elucidated with the present invention it should be understood that these embodiments are merely to illustrate
The present invention rather than restriction the scope of the present invention, after having read the present invention, those skilled in the art are each to the present invention
The modification planting the equivalent form of value all falls within the application claims limited range.
As shown in Figure 1, a kind of radar level gauge guide length measurement apparatus, are with technology of instrument and meter, calculating
Based on machine technology, automated control technology and measuring technology, using the communications protocol such as modular organization and rs232 bus, root
According to waveguide design requirement, the system with high opening, automatization and the suitability developed.Main inclusion horizontal lathe
The digital micrometer 2 the 1st, with communication module, the slip crate 3 with three axle grating scales and its communication module, computer 4, numeral
Micrometer 2, three axle grating scales are connected with computer 4 and carry out data transmission.
The x-axis of three axle grating scales, z-axis direction are parallel with the direct of travel of slip crate, and digital micrometer 2 is fixed on slip crate
On 3 z-axis platform, the thimble telescopic direction of digital micrometer 2 is parallel with z-axis.
The carrier that horizontal lathe 1 measures as waveguide 6, the length of lathe is more than 7m, substantially meets the length of waveguide
Require.When the fixation of waveguide two ends keeps flat, pars intermedia branch produces deformation, leads to linear measure longimetry inaccurate.Comparatively, sharp
The stressing conditions of the model of the angle transition model more approaching to reality more excessive than parabola.In order to eliminate the shadow to measurement for the deformation
Ring, average distance is pressed on the guide rail of horizontal lathe 1 multiple brackets with height-adjustable 5 are set, such deflection value is to measurement error
Contribution is negligible.
Digital micrometer, the certainty of measurement of three axle grating scales all reach 0.01mm, fully meet certainty of measurement and require.
Because the length of waveguide is much larger than general length measurement tool, the therefore present invention adopts a kind of round-about way
The length of measuring wave guide.The method with waveguide, linear measure longimetry being carried out to radar level gauge using above-mentioned measurement apparatus, tool
Body comprises the following steps:
(1) choose a waveguide as standard pipe:
Record its precise length l at temperature t (in the range of 20 ± 0.5 DEG C) in authoritative institutioncal(t), and by known material
The thermalexpansioncoefficientα of material, by formula a:lcat(t)=lcat(20)+lcat(20) * α * (t-20), calculates standard pipe at 20 DEG C
When length.
During calibration, by lcat(t1)-lcat(20)+lcat(20)*α*(t1-20)-lcat(20)+corrcat(tl), calculate
Standard pipe is in t1At a temperature of length.
During test, obtain treating the length difference △ l of test tube and standard pipe by measurementpipe(t2), you can by formula b:It is calculated and treat test tube in test environment
t2At a temperature of length.
(2) waveguide is installed: installation requirement is to lie on horizontal lathe by waveguide, and two ends are fixed, and centre is by height
Degree adjustable support supports.
(3) standard pipe calibration: install standard pipe, using digital micrometer thimble alignment criteria pipe flange as reference certain
One fixed position, rotates slip crate z-axis rocking handle by digital micrometer to standard pipe direction precession 10.00mm, then passes through to calculate
Machine is zeroed to three axle grating scales and digital micrometer simultaneously, and now the reading of three axle grating scales is zero, i.e. the relative position of standard pipe
Shifting is zero.
(4) treat that test tube measures: removal standard pipe, change and treat test tube, rotate slip crate z-axis rocking handle by digital micrometer thimble
To treating the precession of test tube direction until its reading is zero, will treat that test tube is rotated in a clockwise direction a circle, digital micrometer is used for counting
Calculate the little deviation of pipe, computer takes arithmetic mean of instantaneous value to the minor variations brought because of rotation, now three axle grating scale x-axis, z
The arithmetic mean of instantaneous value sum of axle reading and digital micrometer reading as treats the length difference △ l of test tube and standard pipepipe(t2).
Digital micrometer can ensure that and measures small side-play amount when changing whne test tube, also makes simultaneously and treats test tube
Reliable contacts, will not extrude again and cause deformation, serve and are convenient for changing the effect treating test tube.
(5) length of tube to be measured is calculated by formula b.
In the present invention, human-computer interaction interface is used as by computer, is also the test software based on labview that it is installed
Carrier it is achieved that with the collection analysises of computer total digitalization, have software and hardware resources enrich, autgmentability strong, test process
Automatization, the advantage that measuring accuracy is high, reproducible, easy to operate, cost performance is high.
It is desirable to test device should be unified to be placed in the preferable room of closing at a during present invention measurement, room is furnished with greatly
The central air conditioner system of power is it is ensured that measuring environment room temperature controls at 20 ± 1 DEG C.And the left and right sides of horizontal lathe, car
On bed guide rail, on standard pipe and test room plurality of positions, be equipped with the temperature sensor through calibration, and and computer
Connect together and carry out real-time monitoring, and arithmetic mean of instantaneous value is asked to the temperature sensor of nearby waveguides by test software, obtain
Go out the temperature required for calculating, when having fully ensured that measurement, effectively detection and monitoring real-time to Current Temperatures.If environment
Room temperature exceeds permission temperature range, and test software provides information alert, and stops currently testing, and requires until temperature meets.
Claims (3)
1. a kind of radar level gauge with guide length measurement apparatus it is characterised in that: include horizontal lathe (1), numeral thousand points
Chi (2), slip crate (3), computer (4), described digital micrometer (2) has communication module, and described slip crate (3) has three axles
Grating scale and its communication module, described digital micrometer (2), described three axle grating scales are connected into line number with described computer (4)
According to transmission, the guide rail of described horizontal lathe (1) is provided with brackets with height-adjustable (5)；Described brackets with height-adjustable (5) is at least
Two, and be equidistantly uniformly arranged；The x-axis of described three axle grating scales and z-axis direction are flat with the direct of travel of described slip crate (3)
OK, described digital micrometer (2) is fixed on the z-axis platform of described slip crate (3), and the thimble of described digital micrometer (2) is stretched
Contracting direction is parallel with z-axis.
2. a kind of usage right requires the method that the measurement apparatus described in 1 carry out linear measure longimetry to radar level gauge with waveguide,
It is characterized in that comprising the following steps:
(1) choose a waveguide as standard pipe, record its accurate length at being 20 ± 0.5 DEG C in temperature t in authoritative department
Degree, and the thermal coefficient of expansion by known materials, calculate it in actual temperature t1Under length；
(2) waveguide is installed: standard pipe lies on horizontal lathe, and two ends are fixed, and centre is supported by brackets with height-adjustable；
(3) standard pipe calibration: standard pipe is installed, by a certain fixed position of digital micrometer thimble alignment criteria pipe flange,
Rotate slip crate z-axis rocking handle by digital micrometer to standard pipe direction precession 10.00mm, then pass through computer to three axle gratings
Chi and digital micrometer are zeroed simultaneously, and now the reading of three axle grating scales is zero, i.e. the relative displacement of standard pipe is zero；
(4) treat that test tube measures: removal standard pipe, change and treat test tube, rotate slip crate z-axis rocking handle by digital micrometer thimble to treating
The precession of test tube direction, until its reading is zero, will treat that test tube is rotated in a clockwise direction a circle, and digital micrometer is used for computer tube
The little deviation of son, computer takes arithmetic mean of instantaneous value to the minor variations brought because of rotation, and now three axle grating scale x-axis, z-axis are read
The arithmetic mean of instantaneous value sum of number and digital micrometer reading as treats the length difference of test tube and standard pipe；
(5) length of tube to be measured is calculated by formula.
3. method according to claim 2 it is characterised in that: measuring environment room temperature controls at 20 ± 1 DEG C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410606049.1A CN104296633B (en) | 2014-10-31 | 2014-10-31 | Waveguide tube length measuring device for radar liquid level meter and measuring method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410606049.1A CN104296633B (en) | 2014-10-31 | 2014-10-31 | Waveguide tube length measuring device for radar liquid level meter and measuring method thereof |
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| CN104296633A CN104296633A (en) | 2015-01-21 |
| CN104296633B true CN104296633B (en) | 2017-02-01 |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117537721B (en) * | 2024-01-09 | 2024-03-26 | 武汉海德龙仪表科技有限公司 | Length detection device and method for liquid level meter |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS57110902A (en) * | 1980-12-27 | 1982-07-10 | Toshiba Corp | Measuring device for thickness of thin, long-sized cylinder |
| JPH05209701A (en) * | 1991-07-31 | 1993-08-20 | Yoshikawa Kogyo Co Ltd | Length measuring apparatus |
| CN1414341A (en) * | 2002-11-09 | 2003-04-30 | 中国石化胜利油田有限公司东辛采油厂 | Oil pipe length measuring device |
| CN201540091U (en) * | 2009-09-28 | 2010-08-04 | 上海图博可特石油管道涂层有限公司 | Full-automatic measuring motion for tubing used for petroleum extraction |
| CN103017642A (en) * | 2011-09-20 | 2013-04-03 | 北京建筑工程学院 | Displacement meter calibrating apparatus |
| CN103846731A (en) * | 2012-11-29 | 2014-06-11 | 大连龙泽机械有限公司 | Numerical control vertical lathe control system |
| CN203287002U (en) * | 2013-06-06 | 2013-11-13 | 施密特汽车管件(安徽)有限公司 | Length measuring device |
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