CN1800817A - Apparatus and method for online measuring melt viscosity of mold powder - Google Patents

Abstract

The invention provides a device to online measure fused mass viscosity of mold powder and avoid delay time and error increasing, which comprises: a ceramic boat (1) for fused mass, an inclined table (2) to lay the boat, a thermostable sleeve (3), a high-temperature fusing sample system (4), and an image collection system (5). Wherein, using the high-pixel digital camera with long-focus CCD lens to acquire the sharp flow image of fused sample and send to computer directly for treatment to obtain the viscosity value at this temperature. This invention improves experiment accuracy greatly with error within +/-0.3%, and has high-level automatic degree and well repeatability.

Description

The device and method of on-line measurement covering slag melt viscosity

Technical field

The invention belongs to melt physical property fields of measurement.A kind of device and method of on-line measurement covering slag melt viscosity is provided especially.Be applicable to accurate measurement covering slag viscosity.

Technical background

Protective slag for continuous casting has a significant effect to improving continuous casting billet quality.Covering slag can be realized good adiabatic heat-insulation, prevents molten steel oxidation, adsorb the effect that is mingled with, improves heat transfer and lubricated strand.And viscosity is the important physical parameter of high-temperature fusant, is one of principal element that influences its response feature.Viscosity to covering slag can give full play to that its metallurgy action in pouring molten steel, process of setting and the metallurgical behavior that takes place comprise that melt cinder flows into and consumes in crystallizer, lubricated, snotter absorption etc. produces material impact.So,, just must pay much attention to The Characteristic Study and optimizations such as viscosity in order to ensure the superperformance of covering slag in casting.

Mainly still measure with the rotating cylinder method for the covering slag viscosity now, this method utilizes the viscosity head rotate in tested melt with respect to rotate one time delay of existence in air, goes out melt viscosity according to this Time Calculation.

But there is following defective in this method: (1) is higher to the instrument and equipment accuracy requirement, and actual being difficult to reaches, and causes measuring error bigger; (2) the viscosity head is at high temperature easily oxidized, causes testing cost bigger.

Summary of the invention

Mobile and the certain relation of viscosity existence of high-temperature fusant, as the formula (1):

$\mathrm{\&eta;}=K\&CenterDot;\frac{\mathrm{\&sigma;}\&CenterDot;\mathrm{<figure-callout\; id="2"\; label="t\; L"\; filenames="A20051013072900061.png"\; state="\{\{state\}\}">t</figure-callout>}}{L^{}}\&CenterDot;\cos \mathrm{\&theta;}$

η in the formula---melt viscosity

K---hold the cell constant of melt

The surface tension of σ---melt

T---body flowing time

L---melt flows length

ρ---fusant density

The wetting angle of θ---melt and vessel surface

The object of the present invention is to provide a kind of device and method of novel measurement covering slag viscosity, be specifically related to image on-line measurement covering slag viscosity, can on the basis that guarantees experiment success rate, improve the precision and the accuracy of measuring by this technology.Of the present invention theing contents are as follows:

The device of on-line testing covering slag viscosity comprises: hold the porcelain boat 1 of melt, shelve the sloping platform 2 of porcelain boat, exotic material sleeve pipe 3, and molten sample system 4 of high temperature and image capturing system 5.

The exotic material that described porcelain boat 1 can be one of aluminium oxide, quartz, silit is made, is designed to rectangular-shapedly, and length is 60～80mm, and wide is 8～12mm, is 8～12mm deeply, and holding quality in the porcelain boat is the samples to be tested of 3～5 grams, is processed as right cylinder before the experiment.

Described sloping platform 2 is made for refractory brick, is designed to the ramped shaped of pitch angle 30～60 degree, and length is 80～150mm, wide 20～30mm, and high 20～25mm is used to shelve porcelain boat 1.

Described exotic material sleeve pipe 3 is made for the exotic material of one of quartz, aluminium oxide, and internal diameter is 30～50mm, long 500～900mm, and inside pipe casing is equipped with sloping platform 2.

The molten sample system 4 of described high temperature is a tubular furnace, and the temperature control scope is 20～1600 ℃, and high temperature resistant sleeve pipe 3 is equipped with in inside.

Described image capturing system 5 is for being equipped with the digital camera of CCD camera lens, and resolution is 300～700 everything elements, and adjustable focal length is 0.8～1.5m; Described CCD camera lens has loaded optical filter and filter plate.

The method of on-line measurement covering slag viscosity: tubular furnace is heated to more than the measured matter fusing point 100～250 ℃; the standard model of sample to be tested and known viscosity is joined stove respectively be built in the porcelain boat of two same sizes on the sloping platform, under this temperature constant 5～20 minutes.Along with the thawing of sample, with the variation of sample collection state in the camera observes porcelain boat, the flow phenomenon after its thawing is carried out real time record, took a picture once every 1～3 minute.Obtain its length of flow in 1～3 minute by the Computer Processing recordable picture, can both obtain two groups of data of sample to be tested and standard model in every section setting-up time, substitution formula (1) obtains two equations, and simultaneous equations can calculate k value.

The invention has the advantages that: use the device of on-line measurement high-temperature fusant viscosity provided by the invention, the cooperation by sloping platform and image capturing system are set can the Real Time Observation porcelain boat in the flow performance of high-temperature fusant.This device is easy and simple to handle reliable, experimental test is repeatable big, and experimental technique is easily understood, and to the improvement of melt viscosity calculating method, having improved the precision and the accuracy of measuring, is the devices and methods therefor of the high on-line measurement high-temperature fusant viscosity of a kind of degree of accuracy therefore.

Description of drawings

Fig. 1 is apparatus of the present invention synoptic diagram.Wherein, 1 porcelain boat, 2 sloping platforms, 3 exotic material sleeve pipes, 4 high temperature melt sample system, 5 image capturing systems.

Embodiment

Embodiment one: the measurement of covering slag 1 viscosity

The model of certain manufacturers produce is that the covering slag principal ingredient of GS1218/L is: SiO ₂34.6%, Al ₂O ₃4.03%, Fe ₂O ₃0.61%, CaO 26.51%, and MgO 4.49%, K ₂O 0.58%, Na ₂O 13.68%, F ^-8.85%, H ₂O 0.30%, C _Gu3.86%, fusing point is 1072 ℃.

Weighing 3.55g covering slag and standard sample are made right cylinder respectively, put into two measure-alike porcelain boat (95%Al ₂O ₃, long 70mm, wide 10mm, dark 9mm) in.The porcelain boat that fills covering slag is put on the sloping platform (high 20mm, the pitch angle is 30 degree for long 100mm, wide 30mm), sloping platform is put into the aluminium oxide sleeve pipe (99.8%Al of tubular furnace ₂O ₃, internal diameter 42mm, long 700mm) and the center, logical blanket gas argon gas.Be warmed up to 1200 ℃, stablized 5 minutes, molten mold flux is taken pictures, took pictures once every 1 minute, a temperature spot is got 6 groups of data.After experiment finishes, the experiment photo is analyzed with software for calculation.Per two adjacent data can obtain two equations about covering slag and standard sample, and simultaneous can solve one group of viscosity and cell constant K value; 6 measurement points have 5 groups of adjacent datas, can solve five groups of viscositys and K value, average to obtain final viscosity numerical value.

Embodiment two: the measurement of covering slag 2 viscositys

The model of certain manufacturers produce is that the covering slag principal ingredient of GBW01704 is: SiO ₂30.25%, Al ₂O ₃6.59%, Fe ₂O ₃1.84%, CaO 36.21%, and MgO 1.70%, K ₂O 0.50%, Na ₂O 4.25%, F ^-7.60%, H ₂O 0.30%, C _Gu3.56%, fusing point is 1185 ℃.

Weighing 4.00g covering slag and standard sample are made right cylinder respectively, put into two measure-alike porcelain boat (95%Al respectively ₂O ₃, long 70mm, wide 10mm, dark 9mm) in.The porcelain boat that fills covering slag is put on the sloping platform (high 20mm, the pitch angle is 30 degree for long 100mm, wide 30mm), sloping platform is put into the aluminium oxide sleeve pipe (99.8%Al of tubular furnace ₂O ₃, internal diameter 42mm, long 700mm) and the center, logical blanket gas argon gas.Be warmed up to 1400 ℃, stablized 7 minutes, molten mold flux is taken pictures, took pictures once every 1 minute, a temperature spot is got 6 groups of data.After experiment finishes, the experiment photo is analyzed with software for calculation.Per two adjacent data can obtain two equations about covering slag and standard sample, and simultaneous can solve one group of viscosity and cell constant K value; 6 measurement points have 5 groups of adjacent datas, can solve five groups of viscositys and K value, average to obtain final viscosity numerical value.

Claims (7)

1. the device of an on-line measurement covering slag melt viscosity, it is characterized in that: this device comprises: porcelain boat (1), sloping platform (2), exotic material sleeve pipe (3), and molten sample system (4) of high temperature and image capturing system (5).

2. according to the described device of claim 1, it is characterized in that: described porcelain boat (1) is used to hold melt, sloping platform (2) is used to shelve porcelain boat, and the sloping platform (2) that will be equipped with porcelain boat (1) is put into refractory seals sleeve pipe (3), sleeve pipe (3) is put into the molten sample system (4) of high temperature again.

3. according to the described device of claim 1, it is characterized in that: the porcelain boat (1) that holds melt is made by the exotic material of one of aluminium oxide, silicon nitride and quartz, be designed to rectangular-shaped, length is 60～80mm, wide is 8～12mm, be 8～12mm deeply, putting into quality in the porcelain boat (1) is the sample to be tested of 3～5 grams, is processed as right cylinder before the experiment.

4. according to the described device of claim 1, it is characterized in that: the sloping platform (2) of shelving porcelain boat is made for refractory brick, is designed to the ramped shaped of pitch angle 30～60 degree, and length is 80～150mm, and wide is 20～30mm, and height is 20～25mm.

5. according to the described device of claim 1, it is characterized in that: the molten sample system (4) of described high temperature is tubular furnace, the temperature control scope is 20～1600 ℃, image capturing system (5) is for being equipped with the digital camera of CCD camera lens, resolution is 300～700 everything elements, adjustable focal length is 0.8～1.5m, and described CCD camera lens has loaded optical filter and filter plate.

6. method of using the described device of claim 1 to carry out on-line measurement covering slag melt viscosity; it is characterized in that: tubular furnace is heated to more than the measured matter fusing point 100～250 ℃; the standard model of sample to be tested and known viscosity is joined stove respectively to be built in the porcelain boat of two same sizes on the sloping platform; under this temperature constant 5～20 minutes; thawing along with sample; variation with sample collection state in the camera observes porcelain boat; flow phenomenon after its thawing is carried out real time record; took a picture once every 1～3 minute; obtain its length of flow in 1～3 minute by the Computer Processing recordable picture; in every section setting-up time, can both obtain two groups of data of sample to be tested and standard model, can calculate k value by equation.

7. method according to claim 6 is characterized in that: it is formula (1) that described melt viscosity calculates method representation,

$\mathrm{\&eta;}=K\&CenterDot;\frac{\mathrm{\&sigma;}\&CenterDot;t}{L^2\&CenterDot;{\mathrm{\&rho;}}^2}\&CenterDot;\cos \mathrm{\&theta;}---\left(1\right)$

η in the formula---melt viscosity; K---hold the cell constant of melt; The surface tension of σ---melt; T---the melt flows time; L---melt flows length; ρ---fusant density; The wetting angle of θ---melt and vessel surface.

Images