CN102841042A - Method for measuring nozzle granularity by laser - Google Patents
Method for measuring nozzle granularity by laser Download PDFInfo
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- CN102841042A CN102841042A CN2012103316755A CN201210331675A CN102841042A CN 102841042 A CN102841042 A CN 102841042A CN 2012103316755 A CN2012103316755 A CN 2012103316755A CN 201210331675 A CN201210331675 A CN 201210331675A CN 102841042 A CN102841042 A CN 102841042A
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Abstract
The invention discloses a method for measuring nozzle granularity by a laser, belonging to the technical field of the metallurgical testing and is mainly used for detecting spray granularity of a secondary cooling nozzle in a continuous casting steel process. The nozzle is fixed on a machine stand; and automatic regulation for vertical and level positions of the nozzle can be executed through controlling a servo system. The system can be used for detecting the spray granularity of the nozzle; the average diameter of the measurable granularity ranges from 5 mu m to 2,000 mu m; and a relevant test report is generated. The detection method has the advantages of being convenient to operate, high in measuring precision, quick in speed, strong in representation and good in repeatability; and the method is closely combined with manufacturing parameters so as to provide a guiding effect to the continuous casting production process.
Description
Technical field
The invention belongs to metallurgical technical field of measurement and test, a kind of method of laser testing nozzle granularity particularly is provided.Mainly be testing graininess, can accurately test out the granule size of nozzle spray to caster two cold nozzle.
Background technology
In the cooling procedure of continuous casting billet, the cooled and solidified of two cold-zones is key links of casting blank solidification.And the particle property of two cold-zone nozzles has very big influence to cc billet surface quality and cooling performance thereof.The method that mensuration grain graininess commonly used is at present formed has sieve formula, elutriation method and microscopic method.1. sieve formula is used to measure the raw meal particle size of 250～0.038mm.The measurement range of laboratory standard bushing screen is 6～0.038mm; But be difficult to measure viscosity and agglomerating material; The necessary strict standardization of Measuring Time and method of operating; Can not produce real weight distribution; The small size screen cloth is prone to stopped up by material, and is difficult to clean; Screen strength is low, cracky.2. elutriation method is confirmed the granularity of particle to be used to measure the granularity less than the 0.074mm material with the settling velocity of particle in water; Measuring speed is slow, and Mean Time Measurement is wanted more than half a hour, is difficult to replicate analysis; Must control accurately to prevent that thermograde and viscosity from changing; Can not handle the potpourri of different densities.3. microscopic method can be measured the projected area of particle one by one, and to confirm the granularity of particle, the measurement range of optical microscope is 150～0.4 μ m, and the mensuration lower limit granularity of electron microscope can reach 0.001 μ m or littler.Representative poor, speed is slow, can't survey ultra-fine grain.
Summary of the invention
The object of the present invention is to provide a kind of method of laser testing nozzle granularity, overcome that to state prior art representative poor, speed is slow, can't survey the deficiency of ultra-fine grain; Adopt the laser particle size method of testing, static laser light scattering method is mainly measured micron particles, and measurement range is generally at 5-2000 μ m, acquisition be the equivalent sphere volume distributed median, measure accurately, speed is fast, and is representative strong, good reproducibility.
The basic functional principle of this laser particle size method of testing is to utilize the scattering of light method to come the measure moving particle Size Distribution.Be specially: the laser beam of sending from laser instrument focuses on through microcobjective.Behind pin hole filtering and the collimating mirror collimation, become the parallel beam about about 10mm.This light beam irradiates is to particle to be measured, and a part of light is scattered.Scattered light shines on the photodetector array through behind the fourier transform lens.Because photodetector is on the focal plane of fourier transform lens, so any point on the detector is all corresponding to a certain definite scattering angle.Photodetector array is made up of a series of concentric endless belt, and each endless belt is an independently detector, and can will project top scattered light can be linear converts voltage to, gives data collecting card then, sends into computing machine carrying out the A/D conversion.Utilize various algorithms to try to achieve the Size Distribution of particle again.
Testing graininess of the present invention carries out on laser testing nozzle granularity device, and this device comprises mechanical stand, laser particle analyzer, TT&C system computing machine and water pipe and gas piping.The TT&C system computing machine is through air pressure, the airshed of hydraulic pressure, discharge and the gas piping of solenoid valve and variable valve control water pipe; Nozzle is fixed on the mechanical stand, and the TT&C system computing machine is controlled the motion of mechanical stand through servo control mechanism; The transmitter of laser particle analyzer and receiver are distributed in the both sides of nozzle, and receiver is input to the data of gathering in the TT&C system computing machine through data line.Processing step is:
1) nozzle to be measured is installed in above the mechanical stand; Can carry out the motion of vertical and horizontal direction; Vertical movement is defined as upwards, downwards in system, is starting point topmost, and horizontal direction is defined as left, to the right; High order end is a starting point, and the motion of both direction is operated on manual operation platform, computer software respectively; Nozzle moving range: X:0-200mm Z:0-250mm;
2) debugging laser particle analyzer is selected the camera lens multiple and camera lens is installed according to required measurement range, and adjustment focal length centering, and the background signal that enables to collect shows normal; The camera lens multiple is divided into: 300,500,800,1000 times four kinds;
3), set hydraulic pressure, air pressure, discharge, the airshed parameter of nozzle according to the working condition of test needs; The range of each duty parameter is respectively: hydraulic pressure 0-1.6MPa, air pressure 0-1.0MPa, discharge 0-1000l/min, airshed 0-600 Nm
3/ h;
4) image data; Surveying granularity mean diameter scope is: 5 μ m-2000 μ m; Laser particle analyzer is input to the information that collects in the Signal Spacing conditioning case-signal allocation case-granularity main frame of TT&C system; Analysis and processing through testing software obtain the granule size of nozzle water smoke and the distribution of granularity, and generate relevant test report;
Table 1 weight distribution data.
The present invention can the full-automatic regulation nozzle position and direction, regulate water discharge nozzle and airshed automatically, can utilize the granularity of the accurate gaging nozzle of laser, this method has the automaticity height, and is simple to operate, the test result advantage of high precision.
Description of drawings
Fig. 1 is the weight distribution plan.
Embodiment
Following instance is used to set forth the present invention, but protection scope of the present invention is not limited in following examples.
1. nozzle is installed on the mechanical stand, and fixes, regulate the level and the vertical range of nozzle according to test request;
2. open laser particle analyzer, select the camera lens multiple and camera lens is installed according to required measurement particle size range, and adjustment focal length and centering, the background signal that enables to collect shows normal.
3. according to the working condition of test needs, set the parameter (Nm such as hydraulic pressure (MPa), air pressure (MPa), discharge (l/min), airshed of nozzle
3/ h), the range of each duty parameter is respectively: hydraulic pressure 0-1.6MPa, air pressure 0-1.0MPa, discharge 0-1000l/min, airshed 0-600 Nm
3/ h;
4. after test finished, after the data that the nozzle spray granularity collects through the laser testing appearance were handled through information distribution case, information isolation conditioning case, the input computing machine carried out data analysis and processing, obtains the weight distribution tables of data and the weight fraction Butut of nozzle.
Claims (2)
1. the method for a laser testing nozzle granularity is characterized in that:
1) nozzle to be measured is installed in above the mechanical stand; Can carry out the motion of vertical and horizontal direction; Vertical movement is defined as upwards, downwards in system, is starting point topmost, and horizontal direction is defined as left, to the right; High order end is a starting point, and the motion of both direction is operated on manual operation platform, computer software respectively; Nozzle moving range: X:0-200mm Z:0-250mm;
2) debugging laser particle analyzer is selected the camera lens multiple and camera lens is installed according to required measurement range, and adjustment focal length centering, and the background signal that enables to collect shows normal; The camera lens multiple is divided into: 300,500,800,1000 times four kinds;
3), set hydraulic pressure, air pressure, discharge, the airshed parameter of nozzle according to the working condition of test needs; , the range of each duty parameter is respectively: hydraulic pressure 0-1.6MPa, air pressure 0-1.0MPa, discharge 0-1000l/min, airshed 0-600 Nm
3/ h;
4) image data; Surveying granularity mean diameter scope is: 5 μ m-2000 μ m; Laser particle analyzer is input to the information that collects in the Signal Spacing conditioning case-signal allocation case-granularity main frame of TT&C system; Analysis and processing through testing software obtain the granule size of nozzle water smoke and the distribution of granularity, and generate relevant test report;
Testing graininess carries out on laser testing nozzle granularity device.
2. the method for laser testing nozzle granularity according to claim 1 is characterized in that: described laser testing nozzle granularity device comprises mechanical stand, laser particle analyzer, TT&C system computing machine and water pipe and gas piping; The TT&C system computing machine is through air pressure, the airshed of hydraulic pressure, discharge and the gas piping of solenoid valve and variable valve control water pipe; Nozzle is fixed on the mechanical stand, and the TT&C system computing machine is controlled the motion of mechanical stand through servo control mechanism; The transmitter of laser particle analyzer and receiver are distributed in the both sides of nozzle, and receiver is input to the data of gathering in the TT&C system computing machine through data line.
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| CN201210331675.5A CN102841042B (en) | 2012-09-07 | 2012-09-07 | Method for measuring nozzle granularity by laser |
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| CN201210331675.5A CN102841042B (en) | 2012-09-07 | 2012-09-07 | Method for measuring nozzle granularity by laser |
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| CN102841042B CN102841042B (en) | 2014-08-27 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103063555A (en) * | 2012-12-31 | 2013-04-24 | 战仁军 | Smoke particle measuring system |
| CN104181086A (en) * | 2014-08-27 | 2014-12-03 | 天津商业大学 | Two-dimensional scanning detection device and method for atomized particle size distribution |
| CN105865989A (en) * | 2016-03-24 | 2016-08-17 | 西安交通大学 | Optical path switching apparatus used in large spray field laser particle analyzer, and use method thereof |
| CN108490213A (en) * | 2018-02-08 | 2018-09-04 | 上海理工大学 | High temperature gas cooled reactor particle stream velocity field measurement device and method |
| CN111474089A (en) * | 2020-04-23 | 2020-07-31 | 佛山市优一家电制造有限公司 | Water molecule particle size testing method and device of water vapor release equipment |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103063555A (en) * | 2012-12-31 | 2013-04-24 | 战仁军 | Smoke particle measuring system |
| CN104181086A (en) * | 2014-08-27 | 2014-12-03 | 天津商业大学 | Two-dimensional scanning detection device and method for atomized particle size distribution |
| CN104181086B (en) * | 2014-08-27 | 2016-06-22 | 天津商业大学 | A kind of spray particle diameter distribution two-dimensional scan detecting device and detection method |
| CN105865989A (en) * | 2016-03-24 | 2016-08-17 | 西安交通大学 | Optical path switching apparatus used in large spray field laser particle analyzer, and use method thereof |
| CN105865989B (en) * | 2016-03-24 | 2018-04-17 | 西安交通大学 | Light path switching device and application method for large-scale spray field laser particle analyzer |
| CN108490213A (en) * | 2018-02-08 | 2018-09-04 | 上海理工大学 | High temperature gas cooled reactor particle stream velocity field measurement device and method |
| CN108490213B (en) * | 2018-02-08 | 2020-05-19 | 上海理工大学 | High-temperature gas cooled reactor particle flow velocity field measuring device and method |
| CN111474089A (en) * | 2020-04-23 | 2020-07-31 | 佛山市优一家电制造有限公司 | Water molecule particle size testing method and device of water vapor release equipment |
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| CN102841042B (en) | 2014-08-27 |
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Address after: 100041 Shijingshan Road, Shijingshan District, Shijingshan District, Beijing Patentee after: Shougang Group Co. Ltd. Address before: 100041 Shijingshan Road, Shijingshan District, Shijingshan District, Beijing Patentee before: Capital Iron & Steel General Company |