CN102019377B - Device and method for detecting the flow state of molten steel in crystallizer - Google Patents

Abstract

The invention relates to a device and a method for detecting the flow state of molten steel in a crystallizer. The device comprises a funnel (7), a tail fin (8) and an indicator bar (6), wherein the funnel (7) is soaked in the molten steel (20) of a crystallizer and fixedly connected with the tail fin (8), the indicator bar (6) is fixedly connected with the upper part of the funnel (7) and can be rotatably and axially supported on an indicator disc (5) through a rotating bearing (17), the indicator disc (5) can make planar rotation relative to a tray (4), the upper end of the indicator bar (6) which is rotatably and axially supported on the indicator disc (5) is connected with a pull rod (2) which is stuck to a stress strain foil (15), and a signal transmission line (16) is connected to a signal collector by the stress strain foil (15) on the pull rod (2). The device and the method of the invention can favorably detect the flow speed and the flow direction of the molten steel, provide evidence for adjusting the parameters of a steel casting process and further achieve the aims of improving the surface quality of casting blanks and reducing steel casting and bleeding accidents. The device and the method of the invention have wide application prospects in the continuous casting production field.

Description

A kind of checkout gear of the flow state of molten steel in crystallizer and method

Technical field

The present invention relates to the detection field in the metallurgical process, particularly, the present invention relates to a kind of checkout gear and method of the flow state of molten steel in crystallizer, described checkout gear and method are used for flowing velocity and the flow direction of Mold are detected.

Background technology

In the sheet billet continuous casting production process, the surperficial flowing velocity of molten steel in mold and flow direction are the key indexs that directly determines cc billet surface quality.As the upstream materials of Automobile Plate etc., the surface quality that slab is good is to determine whether qualified key of cold rolled automobile sheet.For this reason, many slab casters of the outer iron and steel metallurgy enterprise of Present Domestic have adopted one after another choose reasonable submersed nozzle inclination angle, have increased flow velocity and the flow direction that Mold is regulated in the measures such as M-EMS and the logical argon of Reasonable Regulation And Control, the flow regime of guaranteeing the meniscus near zone of crystallizer surface meets technological requirement, and then reaches rational meniscus initial set speed.Thus, when significantly reducing liquid level slag and molten steel inner inclusion, can well promote the growth of initial set base shell, reduce the generation of bleed-out accident.

According to detection method in the past, all adopt 2 current vortexs to detect to obtain the technology of crystallizer molten steel flow velocity, namely by in a certain zone of mold liquid level, for the molten steel flow of liquid level zones of different the impact of the detection signal of eddy current probe is obtained a kind of detection mode to molten steel flow speed.Its concrete operations have:

1. adopt single eddy current probe to carry out hot-fluid and detect to obtain detection to molten steel flow speed, after this molten steel flow velocity and optimum flow rate are compared, regulate the technological parameters such as intervention frequency of mold gap inclination angle, argon gas and electromagnetic agitation, reach thus the purpose of flow velocity the best.

Yet described mode is because conversion process is too complicated, and middle influence factor is too much; such as the covering slag varied in thickness is large, liquid level is unstable etc.; it is inaccurate to cause easily vortex finder to detect, and the direction that is difficult to accurately obtain level, the especially flow of flow velocity detects very difficult.

2. for the detection of some normal temperature fluids (comprising chemical fluid), adopt screw, electromagnetic wand etc. to carry out flow velocity, flow detection, the degree of accuracy is higher, but aspect the molten steel flow rate detection that has high-intensity magnetic field up to more than 1500 ℃ and inside, or blank out.

In sum, now a kind of simple and easy and checkout gear of can be at any time the metal flow states such as the flowing velocity of meniscus region molten steel around detecting in the crystallizer and direction being detected is badly in need of in the production scene.

Summary of the invention

In order to address the above problem, the invention provides a kind of checkout gear and method of the flow state of molten steel in crystallizer, the checkout gear of described the flow state of molten steel in crystallizer and method be a kind of can be to the flow velocity of crystallizer molten steel, flow to the easy device that detects online, carry out multimetering by the moved by hand checkout gear along the inside and outside arc length limit of crystallizer, reach and detect a certain wide the purpose along the steel liquid flow state of horizontal direction.

The checkout gear concrete structure of the flow state of molten steel in crystallizer of the present invention is as described below:

A kind of checkout gear of the flow state of molten steel in crystallizer, the checkout gear of described the flow state of molten steel in crystallizer comprises: the funnel 7 in the molten liquid steel 20 of immersion crystallizer, be fixedly connected with an empennage 8 of described funnel 7, be fixedly connected with the indicating bar 6 of funnel 7 tops, described indicating bar 6 rotatable shafts prop up in indicating dial 5, indicating dial 5 relatively pallet 4 is made Plane Rotation, rotatable shaft props up in indicating bar 6 upper ends of indicating dial 5 and connects a pull bar 2, be pasted with ess-strain sheet 15 on the pull bar 2, pull bar 2 upper stress foil gauges 15 connect signal transmssion line 16 to signal picker.

Checkout gear according to the flow state of molten steel in crystallizer of the present invention is characterized in that, described indicating bar 6 drives by rolling bearing 17 and connects square 13.

Checkout gear according to the flow state of molten steel in crystallizer of the present invention is characterized in that, described connection square 13 is connected with rotating between the indicating dial 5 as square closely.

Checkout gear according to the flow state of molten steel in crystallizer of the present invention is characterized in that, described indicating bar 6 upper ends arrange a weighted spherical ball 1.

Checkout gear according to the flow state of molten steel in crystallizer of the present invention is characterized in that, described pull bar 2 connects bracing frame 12 by support arm 3 by supporting traverse 14.

Checkout gear according to the flow state of molten steel in crystallizer of the present invention is characterized in that, support frame as described above 12 base levels, and rotation height adjusting nut 11 and sliding sleeve 9 by guide rod 10 carry out height adjusting.

Checkout gear according to the flow state of molten steel in crystallizer of the present invention, supporting traverse 14, foil gauge 15, signal transmssion line 16 and rolling bearing 17 are when pull bar 2 tension, the resistance value of ess-strain sheet 15 changes at once, and the flow through flowing velocity of funnel 7 of its variable quantity and molten steel 20 presents typical functional relation.

At this moment, the Changing Pattern of ess-strain sheet 15 the energising situation under by signal picker Real-time Collection (referring to Fig. 4), then the data that detect directly can be inputted (or wireless real-time transmission) to anacom, can obtain the flow resistance value of molten steel 20 this moment, thereby calculate the flowing velocity that obtains molten steel 20.

The detection method of the flow state of molten steel in crystallizer of the present invention is as described below:

A kind of detection method of the flow state of molten steel in crystallizer, described method comprises the steps:

(1) right to use requires the checkout gear of 1 described the flow state of molten steel in crystallizer, and funnel 7 and empennage 8 are immersed in the molten liquid steel 20 of crystallizer;

(2) molten steel 20 that is under the steady flow condition drives empennage 8, rotates indicating dial 5 rotating relative to pallet 4 generation certain angles thereby drive;

(3) after maintenance is stablized, rotate molten steel 20 flow directions that indicating dial 5 indicated relative angle values are current detection point;

(4) molten steel 20 is when flowing through funnel 7, its flow resistance value is by the transfer function pulling pull bar 2 of indicating bar 6, under pull bar 2 tensions, the resistance value that is pasted on the ess-strain sheet 15 on the pull bar 2 changes, and the flow through flowing velocity of funnel 7 of its variable quantity and molten steel 20 presents functional relation;

$\mathrm{\ΔR}=\frac{\mathrm{\ΔV}\·2R}{U},$

Flow velocity unit: m/s.

(5) Changing Pattern of ess-strain sheet 15 by the signal picker Real-time Collection, then can be directly inputted into anacom with the data that detect in the situation of energising, can obtain the flow resistance value of molten steel 20 this moment, calculates the flowing velocity that obtains molten steel 20:

$f\left(v\right)=\frac{2\mathrm{\&Delta;VR}\&CenterDot;l_s\&CenterDot;A\&CenterDot;E}{U\&CenterDot;K\&CenterDot;{\mathrm{<figure-callout\; id="15"\; label="l"\; filenames="H2009101960197E00012.png,H2009101960197E00021.png"\; state="\{\{state\}\}">l</figure-callout>}}_{15}\&CenterDot;l_x}$

$v=f^{-1}\left(\frac{2\mathrm{\&Delta;VR}\&CenterDot;l_s\&CenterDot;A\&CenterDot;E}{U\&CenterDot;K\&CenterDot;{\mathrm{<figure-callout\; id="15"\; label="l"\; filenames="H2009101960197E00012.png,H2009101960197E00021.png"\; state="\{\{state\}\}">l</figure-callout>}}_{15}\&CenterDot;l_x}\right),$

In the formula: the original resistance value when strain does not occur R-resistance strain gage 15;

f ₂Tension level on the-pull bar 2, f ₂₁Expression be value of thrust on the pull bar 2 of bearing strain sheet 15, unit is newton;

K-foil gauge 15 resistance value influences coefficients get 10 ²～10 ⁸Ω/m;

Δ l ₁₅-be the elongation of foil gauge 15;

The area of section in A-pull bar 2 thin zones, unit is m ²

The elastic modelling quantity of E-pull bar 2 materials, rigid is got 1.6-2.2 * 10 ¹¹Pa;

ε ₂, the elastic strain of foil gauge 15;

U is constant voltage;

Δ V molten steel change in flow amount, unit: m/s;

l _sThe tie point of expression indicating bar 6 upper connecting rods 2 is to the length value between rolling bearing 17 centers, and unit is m;

K-foil gauge 15 resistance value influences coefficients get 10 ²～10 ⁸Ω/m.

9. the detection method of the flow state of molten steel in crystallizer as claimed in claim 8 is characterized in that, described E, and namely the springform of pull bar 2 materials is measured 2.0-2.1 * 10 ¹¹Pa.

Checkout gear and method according to the flow state of molten steel in crystallizer of the present invention take full advantage of flow resistance, realize the online detection to the flow regime of high-temperature molten steel.The checkout gear of the flow state of molten steel in crystallizer of the present invention and method are by off-line calibration and the online contrast that detects, can well detect flowing velocity and the flow direction of molten steel, water the evidence that the steel technological parameter is adjusted for the technical staff of production scene provides, and then reach and improve cc billet surface quality, reduce the purpose of watering steel bleed-out accident.The checkout gear of the flow state of molten steel in crystallizer of the present invention and method have broad application prospects at the continuous casting production field.

Description of drawings

Fig. 1 is the schematic perspective view of the checkout gear of the flow state of molten steel in crystallizer of the present invention;

Fig. 2 is the detection device component exploded perspective schematic diagram of the flow state of molten steel in crystallizer of the present invention;

Fig. 3 A, B be respectively the flow state of molten steel in crystallizer of the present invention checkout gear the rotation indicating dial schematic perspective view with the assembling after cutaway view;

Fig. 4 is that state diagram is implemented in the detection of the checkout gear of the flow state of molten steel in crystallizer of the present invention;

Fig. 5 is the stickup schematic diagram of foil gauge on the pull bar of checkout gear of the flow state of molten steel in crystallizer of the present invention;

Fig. 6 is the curve figure of demarcation flow-speed measurement model of the checkout gear of the flow state of molten steel in crystallizer of the present invention.

Among the figure: 1 is weighted spherical ball, and 2 is pull bar, and 3 is support arm, and 4 is pallet, 5 for rotating indicating dial, and 6 is indicating bar, and 7 is funnel, and 8 is empennage, 9 is sliding sleeve, and 10 is guide rod, and 11 is the height adjusting nut, and 12 is bracing frame, 13 for connecting square, and 14 is supporting traverse, and 15 is the ess-strain sheet, 16 is signal transmssion line, and 17 is rolling bearing, and 18 are connected in bolt on the indicating bar 6 for being used for connecting square 13 by rolling bearing 17 axles, 19 is horizontal bearing, and 20 is molten steel, and 21 is signal picker.

The specific embodiment

Be described further below in conjunction with the checkout gear of accompanying drawing to the flow state of molten steel in crystallizer of the present invention.

At first in the molten liquid steel 20 with funnel 7 and 8 immersion crystallizers of empennage, along with stablizing of molten steel 20 flow regimes, molten steel 20 drives empennage 8, rotate indicating dial 5 rotating relative to pallet 4 generation certain angles thereby drive, and after keeping stablizing, rotate molten steel 20 flow directions that indicating dial 5 these indicated relative angle values are current detection point; Simultaneously, molten steel 20 is when flowing through funnel 7, because funnel exists large mouth to advance the characteristics that osculum goes out, its flow resistance value is by the transfer function pulling pull bar 2 of indicating bar 6, and be pasted with ess-strain sheet 15 on the pull bar 2, when pull bar 2 tension, the resistance value of ess-strain sheet 15 changes at once, and the flow through flowing velocity of funnel 7 of its variable quantity and molten steel 20 presents typical functional relation.And this moment ess-strain sheet 15 Changing Pattern in the situation of energising by signal picker Real-time Collection (referring to Fig. 4), then the data that detect directly can be inputted (or wireless real-time transmission) to anacom, can obtain the flow resistance value of molten steel 20 this moment, thereby calculate the flowing velocity that obtains molten steel 20.

Must reasonably demarcate this device before detecting, funnel 7 and empennage 8 being immersed in together with 6 one of indicating bars in the pyrosol of the same race of certain depth and known flowing velocity (for example can adopt the watery fusion metal similar to steel solution 20 liquid performances to replace the steel solution 20 of high temperature), after constantly the immersion depth of variation funnel 7 and maintenance are stablized, the collection capacity change level of detail record ess-strain sheet 15, and make the demarcation form of standard, for detecting mark later on.

When the production scene is detected, checkout gear is installed on wide side of crystallizer (inner arc side or outer arc side all can), the base of guaranteeing bracing frame 12 is in comparatively desirable horizontal level (can proofread and correct by horizon rule), directly determines the depth level that funnel 7 and empennage 8 immerse molten steel 20 by rotation height adjusting nut 11.Behind Depth determination, left standstill one minute, empennage 8 drives the deflection of rotating indicating dial 5 relative pallet generation certain angles at once under the flow resistance of molten steel 20, then can slowly settle out; After direction was stable, funnel 7 can bear in this flow field must flow resistance, and with this Resistance Value real-time be passed to signal picker and storage.Measure complete after, the demarcation form before the signal contrast that ess-strain sheet 15 is gathered detects can be known the rate level of molten steel 20.So, can accurately obtain flow velocity and the flow direction of molten steel 20.

The detection principle of the checkout gear of the flow state of molten steel in crystallizer of the present invention is mainly based on following 2 points:

1. the detection of flow velocity: funnel 7 is because having special funnel shaped, its resistance levels f in fluid ₀Value becomes typical functional relation with the flowing velocity value v of fluid:

f ₀＝f(v) (1)

For obtaining accurately and reliably this f ₀The big or small level of value is by the leverage of indicating bar 6 with rolling bearing 17, accurately with this Resistance Value f ₀Be passed on the pull bar 2, this moment, pull bar 2 was (referring to Fig. 2) with the force level that is subjected at indicating bar 6 tie points 21 places:

f ₂₁·l _s＝f(v)·l _x (2)

Draw: ${\mathrm{<figure-callout\; id="21"\; label="f"\; filenames="H2009101960197E00012.png,H2009101960197E00023.png"\; state="\{\{state\}\}">f</figure-callout>}}_{21}=\frac{l_x}{l_s}\&CenterDot;f\left(v\right),$

Herein, l _sThe tie point of-indicating bar 6 upper connecting rods 2 is to the length value between rolling bearing 17 centers, and unit is m.

l _x-the length value between rolling bearing 17 centers that is hopper centre's line to the indicating bar 6, unit is m.

And because pull bar 2 be the two ends stud connection, belong to typical pure stress pull bar, so pull bar 2 only bears single stretching action power, namely foil gauge 15 only bears stretching action (referring to Fig. 5), and the tension level on the pull bar 2 is at this moment:

${\mathrm{<figure-callout\; id="2"\; label="f"\; filenames="H2009101960197E00021.png,H2009101960197E00023.png"\; state="\{\{state\}\}">f</figure-callout>}}_2={\mathrm{<figure-callout\; id="21"\; label="f"\; filenames="H2009101960197E00012.png,H2009101960197E00023.png"\; state="\{\{state\}\}">f</figure-callout>}}_{21}=\frac{l_x}{l_s}\&CenterDot;f\left(v\right)---\left(3\right)$

$\mathrm{\&Delta;R}=\frac{\mathrm{\&Delta;V}\&CenterDot;2R}{U},$

In the following formula, molten steel flow velocity unit: m/s, l _xExpression;

Original resistance value when strain does not occur R-resistance strain gage 15;

f ₂₁The support force level of pull bar 2 and indicating bar 6 junctions, the newton of unit;

f ₂The internal tension value of bearing on the expression pull bar 2, the newton of unit, both are duplicate physical quantitys, the form of indication statement is different.Both units are newton;

U is constant voltage;

Δ V molten steel change in flow amount: the variable quantity of molten steel flow velocity refers to the difference of the mobile absolute velocity of crystallizer zone different parts, does not usually wait at 0～10cm/min;

l _sThe expression length value, namely the tie point of indicating bar 6 upper connecting rods 2 is to the length value between rolling bearing 17 centers, and unit is m;

Because pull bar 2 be two ends thick-metalwork that zone line is thin, and be pasted with ess-strain sheet 15 in the intermediate thin zone, axially strictly parallel (referring to Fig. 5) of the stickup direction of foil gauge 15 and scuffing of cylinder bore 2, ess-strain sheet 15 is at pulling force f at this moment ₂Stretching action under do the trace elasticity elastic strain ε ₂, concern as follows:

f ₂＝A·E·ε ₂

Can get: ${\mathrm{\&epsiv;}}_2=\frac{{\mathrm{<figure-callout\; id="2"\; label="f"\; filenames="H2009101960197E00021.png,H2009101960197E00023.png"\; state="\{\{state\}\}">f</figure-callout>}}_2}{\mathrm{AE}}---\left(4\right)$

In the formula: the area of section in A-pull bar 2 thin zones; The elastic modelling quantity of E-pull bar 2 materials;

Rigid is got 1.6-2.2 * 10 ¹¹Pa; Be more preferably 2.0-2.1 * 10 ¹¹Pa.

f ₂Tension level on the-pull bar 2, f ₂₁Expression be value of thrust on the pull bar 2 of bearing strain sheet 15, unit is newton;

K-foil gauge 15 resistance value influences coefficients get 10 ²～10 ⁸Ω/m;

Δ l ₁₅-be the elongation of foil gauge 15;

The area of section in A-pull bar 2 thin zones, unit is m ²

The elastic modelling quantity of E-pull bar 2 materials, rigid is got 1.9-2.2 * 10 ¹¹Pa;

ε ₂, the elastic strain of foil gauge 15;

Δ l ₁₅, the elongation of trace occurs in foil gauge 15;

U is constant voltage;

l _sThe length value of expression, namely the tie point of indicating bar 6 upper connecting rods 2 is to the length value between rolling bearing 17 centers, and unit is m;

f ₂₁The support force level of pull bar 2 and indicating bar 6 junctions, the newton of unit, f ₂The internal tension value that expression is born on the pull bar 2, the newton of unit, above-mentioned both are duplicate physical quantitys, only be that the form of statement is different.Both units are newton.

This moment, foil gauge 15 was because closely paste with pull bar 2, so foil gauge 15 can on all four elastic strain ε occur along with pull bar 2 ₂, simultaneously, under this strain, the elongation Δ l of trace can occur in foil gauge 15 ₁₅, so cause the increase of the resistance value generation approximately linear of foil gauge 15:

ΔR＝K·Δl ₁₅＝K·(l ₁₅·ε ₂) (5)

In the formula: K-foil gauge 15 resistance value influences coefficients; Get 10 ²～10 ⁸Ω/m, because the foil gauge influence coefficient is to be determined by the resistance wire physical attribute of each different types of strain sheet, as a rule, its resistance influence coefficient desirable 10 ²～10 ⁸Ω/m.

Δ l ₁₅-be the elongation of foil gauge 15.

If keep constant voltage U (such as the DC voltage of U=12V) to load to foil gauge 15 during this period, by utilizing high-frequency data capture card (such as the 200Hz frequency acquisition) that the magnitude of voltage on the foil gauge 15 is gathered behind the Wheatstone bridge group bridge (being assumed to be half-bridge herein), can obtain the variable quantity of foil gauge 15 resistances.

$\mathrm{\&Delta;R}=\frac{\mathrm{\&Delta;V}\&CenterDot;2R}{U}---\left(6\right)$

In the formula: the original resistance value when strain does not occur R-resistance strain gage 15.

At this moment, with formula 1,2,3,4,5 substitution formula 6 respectively, can be such as minor function:

$f\left(v\right)=\frac{2\mathrm{\&Delta;VR}\&CenterDot;l_s\&CenterDot;A\&CenterDot;E}{U\&CenterDot;K\&CenterDot;{\mathrm{<figure-callout\; id="15"\; label="l"\; filenames="H2009101960197E00012.png,H2009101960197E00021.png"\; state="\{\{state\}\}">l</figure-callout>}}_{15}\&CenterDot;l_x}---\left(7\right)$

By formula 7 as can be known, corresponding parameter Δ V, the l of f (v) _sDeng being known quantity or can directly measuring the amount of acquisition, so can get:

$v=f^{-1}\left(\frac{2\mathrm{\&Delta;VR}\&CenterDot;l_s\&CenterDot;A\&CenterDot;E}{U\&CenterDot;K\&CenterDot;{\mathrm{<figure-callout\; id="15"\; label="l"\; filenames="H2009101960197E00012.png,H2009101960197E00021.png"\; state="\{\{state\}\}">l</figure-callout>}}_{15}\&CenterDot;l_x}\right)---\left(8\right)$

Analytic process by above as can be known, f (v) function is simple single-factor function, changed factor is Δ V, this function curve by experiment chamber can obtain: select the extremely similar metal of flow properties of molten condition current downflow attribute and liquid molten steel (such as metallic tin, the low-melting metals such as lead), in stable state flow velocity groove, measuring demarcation under the watery fusion state, by different flowing velocities is set, record voltage change corresponding under this flow velocity, thus match, can obtain formula 8 corresponding function curve diagrams, formula 8 is the analytic modell analytical model of this measuring system, as shown in Figure 6.

2. utilize the empennage 8 be connected with funnel 7 and the drag effect between the fluid, show in real time the flow direction of fluid

Obtain the flow direction of pyrosol.Take the axle center of indicating bar 6 as the center of circle, the angle position in the angle position in empennage 8 relative these centers of circle and pull bar 2 relative these centers of circle must strict conformance.

When immersing in the molten steel of unknown flow regime with funnel 7 empennage 8, empennage 8 relies on the cutting pressure effect of its thin-wall part and fluid, around the rotation of the axle center of indicating bar 6, when the flow direction of fluid was stablized, empennage 8 kept the most at last for keeping stable: the line direction in empennage 8 and indicating bar 6 axle center and the flow direction of fluid are consistent.In this process, empennage 8 is under the driving of fluid flow pressure, drive the rotation that certain angle occurs around the axle center indicating bar 6, indicating bar 6 utilizes rolling bearing 17 to drive connection square 13, be connected owing to connect between square 13 and the rotation indicating dial 5 for square closely, and the pair of bearings of lower resistance is equipped with in indicating dial 5 bottoms, the beat direction with empennage 8 is consistent all the time to guarantee to rotate the rotation direction of indicating dial 5, for empennage 8 stable after, also the scale value maintenance on the pallet 4 is motionless relatively to rotate indicating dial 5.At this moment, manual record indicating dial 5 indication on pallet 4 is delivered scale and is got final product, and this relatively rotates the flow direction value that angle value is molten steel.

Before the detection, the funnel 7 of the checkout gear of the flow state of molten steel in crystallizer of the present invention immerses in the high-temp liquid of certain depth with empennage 8, by when the indicating bar 6 different depth scale, the dependent variable level of detail record ess-strain sheet 15 correspondence under different in flow rate, and make the demarcation form of standard, for detecting mark later on.

Calibrated checkout gear can apply to on-the-spot actual production.During detection, checkout gear is installed on wide side of crystallizer (inner arc side or outer arc side all can), the base of guaranteeing bracing frame 12 is in comparatively desirable horizontal level (can proofread and correct by horizon rule), directly determines the depth level that funnel 7 and empennage 8 immerse molten steel by rotation height adjusting nut 11.Behind Depth determination, left standstill one minute, empennage 8 drives the deflection of rotating indicating dial 5 relative pallet generation certain angles at once under the flow resistance of molten steel, then can slowly settle out; After direction was stable, funnel 7 can bear in this flow field must flow resistance, and with this Resistance Value real-time be passed to signal picker and storage.Measure complete after, the demarcation form before the signal contrast that ess-strain sheet 15 is gathered detects can be known the rate level of molten steel.So, can accurately obtain flow velocity and the flow direction of molten steel.

Must reasonably demarcate this device before detecting, funnel 7 and empennage 8 being immersed in together with 6 one of indicating bars in the pyrosol of the same race of certain depth and known flowing velocity (for example can adopt the watery fusion metal similar to steel solution 20 liquid performances to replace the steel solution 20 of high temperature), after constantly the immersion depth of variation funnel 7 and maintenance are stablized, the collection capacity change level of detail record ess-strain sheet 15, and make the demarcation form of standard, for detecting mark later on.

When the production scene is detected, checkout gear is installed on wide side of crystallizer (inner arc side or outer arc side all can), the base of guaranteeing bracing frame 12 is in comparatively desirable horizontal level (can proofread and correct by horizon rule), directly determines the depth level that funnel 7 and empennage 8 immerse molten steel 20 by rotation height adjusting nut 11.Behind Depth determination, leave standstill one minute clock, empennage 8 drives the deflection of rotating indicating dial 5 relative pallet generation certain angles at once under the flow resistance of molten steel 20, then can slowly settle out; After direction was stable, funnel 7 can bear in this flow field must flow resistance, and with this Resistance Value real-time be passed to signal picker and storage.Measure complete after, the demarcation form before the signal contrast that ess-strain sheet 15 is gathered detects can be known the rate level of molten steel 20.So, can accurately obtain flow velocity and the flow direction of molten steel 20.

Calculated example:

Definition: l _s---be 0.1m;

l _x---be 0.6m;

K---resistance coefficient is taken as 10 ⁸Ω/m;

Δ l ₁₅---foil gauge resistance wire overall length is 0.01m;

E---springform measures 2.1 * 10 ¹¹Pa;

The thin regional area of section of A---scuffing of cylinder bore 2,1.0 * 10 ^-3m ²

In addition, be 5 * 10 at the molten steel flow velocity ^-3M/s, and be between flow velocity and the funnel resistance: the functional relation of f=10000 * V thus, can be calculated as follows by formula:

Then, the flow resistance value of funnel 7 in molten steel is:

f＝10000×5×10 ^-3＝50N；

By ${\mathrm{<figure-callout\; id="2"\; label="f"\; filenames="H2009101960197E00021.png,H2009101960197E00023.png"\; state="\{\{state\}\}">f</figure-callout>}}_2={\mathrm{<figure-callout\; id="21"\; label="f"\; filenames="H2009101960197E00012.png,H2009101960197E00023.png"\; state="\{\{state\}\}">f</figure-callout>}}_{21}=\frac{l_x}{l_s}\&CenterDot;f\left(v\right)$ As can be known, the pulling force that bears on the pull bar 2 is:

f2＝50×(0.6/0.1)＝300N

At this moment, the stressed of scuffing of cylinder bore 2 must pass through weakened region, and the sectional area of weakened region is 1.0 * 10 ^-3m ², so must extending under the pulling force effect of weakened region as can be known, its elongation is:

f ₂=AE ε ₂, ${\mathrm{\&epsiv;}}_2=\frac{{\mathrm{<figure-callout\; id="2"\; label="f"\; filenames="H2009101960197E00021.png,H2009101960197E00023.png"\; state="\{\{state\}\}">f</figure-callout>}}_2}{\mathrm{AE}}=\frac{300}{1\&times;{10}^{-3}\&times;2.1\&times;{10}^{11}}=1.43\&times;{10}^{-6};$

The resistance value increase that can get on the foil gauge thus, is:

ΔR＝K·ε ₂·l ₁₅＝10 ⁸×1.43×10 ^-6×0.01＝1.43Ω；

Hence one can see that: as long as insert the drag effect that the interior funnel 7 of molten steel face is subject to fluid, foil gauge 15 on the pull bar 2 will produce the resistance-strain amount of a correspondence, this dependent variable just can in time be collected in the computer by resistance strain gauge, data acquisition card etc., carries out corresponding analyzing and processing.Therefore, by obtaining the resistance change of foil gauge 15, can corresponding derive the molten steel flow velocity amplitude in funnel 7 zones of living in, thereby realize the detection of flow velocity.

Checkout gear and method according to the flow state of molten steel in crystallizer of the present invention take full advantage of flow resistance, realize the online detection to the flow regime of high-temperature molten steel.The checkout gear of the flow state of molten steel in crystallizer of the present invention and method are by off-line calibration and the online contrast that detects, can well detect flowing velocity and the flow direction of molten steel, water the evidence that the steel technological parameter is adjusted for the technical staff of production scene provides, and then reach and improve cc billet surface quality, reduce the purpose of watering steel bleed-out accident.The checkout gear of the flow state of molten steel in crystallizer of the present invention and method have broad application prospects at the continuous casting production field.

Claims (6)

1. the checkout gear of a flow state of molten steel in crystallizer, the checkout gear of described the flow state of molten steel in crystallizer comprises:

Funnel (7) in the molten liquid steel (20) of immersion crystallizer, be fixedly connected with an empennage (8) of described funnel (7), be fixedly connected with the indicating bar (6) of funnel (7) top, described indicating bar (6) props up in indicating dial (5) by rolling bearing (17) rotatable shaft, indicating dial (5) relatively pallet (4) is made Plane Rotation, rotatable shaft props up in the indicating bar of indicating dial (5) (6) upper end and connects a pull bar (2), be pasted with ess-strain sheet (15) on the pull bar (2), the ess-strain sheet (15) on the pull bar (2) connects signal transmssion line (16) to signal picker.

2. the checkout gear of the flow state of molten steel in crystallizer as claimed in claim 1 is characterized in that, described indicating bar (6) drives by rolling bearing (17) and connects square (13).

3. the checkout gear of the flow state of molten steel in crystallizer as claimed in claim 2 is characterized in that, described connection square (13) is connected with rotating between the indicating dial (5) as square closely.

4. the checkout gear of the flow state of molten steel in crystallizer as claimed in claim 1 is characterized in that, described indicating bar (6) upper end arranges a weighted spherical ball (1).

5. the checkout gear of the flow state of molten steel in crystallizer as claimed in claim 1 is characterized in that, described pull bar (2) is by support arm (3) and cross supporting traverse (14) connection bracing frame (12).

6. the checkout gear of the flow state of molten steel in crystallizer as claimed in claim 5 is characterized in that, support frame as described above (12) base level, and rotation height adjusting nut (11) and sliding sleeve (9) by guide rod (10) carry out the height adjusting.

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