CN201288203Y - Slag discharge detecting device of revolving furnace - Google Patents

Abstract

A revolving furnace slag roughing detecting apparatus relates to the slag roughing technology of revolving furnaces used on steel-making revolving furnaces, and is characterized in that a far-infrared heat detecting instrument is fixedly arranged on a revolving furnace platform or the lower position of the revolving furnace aligning to the edge orientation of tapping orifice, the output end of the far-infrared heat detecting instrument is connected with the input end of the central processing unit (CPU), the controlling output end of the CPU is communicated with a gate valve switch controlling apparatus on the revolving furnace, the CPU comprises a storage apparatus of given unit cross-section energy correlation data, a computational processor which can make sure the boundary value of image areas, and work out the real-time cross-section area of the orifice flow and unit energy value, a comparator which compares the real-time value with the given unit cross-section energy correlation data, and a control instruction device which can input comparative instant signals to the gate valve switch controlling device. The revolving furnace slag roughing detection apparatus overcomes the defects of the electromagnetic induction detection method, such as high energy consumption, complex operation, and the thermal imaging of the orifice flow has high accuracy and efficiency through the CPU.

Description

Slag proofing unit under the converter

Technical field:

The utility model relate to a kind of under the converter of using on the steel-making converter slag technology.

Background technology:

In order to improve converter pushing off the slag effect, further investigate at the pushing off the slag technical elements both at home and abroad.Since day in 1970 slag-blocking ball pushing off the slag of the present invention slag-blocked tapping, various countries are the tens kinds of pushing off the slag methods of having improved converter tapping pushing off the slag technological invention, are also constantly improving and perfect at present.Known converter tapping pushing off the slag method has slag-blocking ball method, floating plug method, pneumatic pushing off the slag method, scum rod method etc.

The foundation when decision finishes tapping process is that slag is discharged from tap hole, normally relied on operator's experience to be judged in the past, because the operator just finds very difficulty of slag at slag when tap hole is discharged, the earliest time of finding slag should be that slag is when running into molten steel in the ladle (because the color of slag has significantly different with the color of molten steel), the flue dust that produces when adding tapping is very big, so will find that slag is just difficult more.Therefore find that slag is one and depends on operator's the experience and the subjective process of attention to a great extent.

Domestic present survey slag is in the majority with the electromagnetic induction detection method, and this method adopts high-temperature material that elementary, secondary two coils are isolated, and overall package.According to the specific conductivity of slag in the beam specific conductivity far below molten steel, the difference of measuring electromagnetic field detects slag down.This kind method is that deflection type is measured life-span instability, complex operation.

Summary of the invention:

The purpose of this utility model is to overcome above-mentioned defective, and a kind of slag proofing unit under the converter that all subjectivities are disturbed and operator's reaction times influences of getting rid of is provided.

Scheme of the present utility model is: at the converter platform or at alignment lens can the be tapped avris orientation fixed installation far infrared hot-probing instrument of beam of stove upper/lower positions, the output terminal of far infrared hot-probing instrument is connected into the input terminus of central processor CPU, and the control output end of CPU is communicated with gate valve switch control device in the converter;

CPU comprises:

1, be used to have the storing device of setting unit's cross section energy correlation data of the beam thermal radiation energy of the big small area of the various cross section of steel beam, this storing device is connected with comparer;

2, be used to receive the steel beam image of far infrared hot-probing instrument collection input and this sharp point position handled determine the image-region cut off value, union goes out the thermal radiation Energy value in the real-time section area value of beam, this cross section and the arithmetic processing apparatus of real-time energy per unit area value, and this device is connected with comparer;

3, be used for real-time energy per unit area value with set the comparer that unit cross section energy correlation data compares; This comparator output terminal is connected with the steering order device;

4, be used for the real-time energy per unit area value of comparer input is inputed to less than the unit cross section Energy value comparison momentary signal of the correlation data of setting the steering order device of hydro-pump switch controlling device.

Advantage of the present utility model has been to overcome the defective of the high complex operation of electromagnetic induction testing energy consumption, handles accuracy with the beam thermal imaging by CPU, the efficient height.

Description of drawings:

Accompanying drawing is the utility model structural representation.

Embodiment:

Structure of the present utility model is at the converter platform or at alignment lens can the be tapped avris orientation fixed installation far infrared hot-probing instrument of beam of stove upper/lower positions, the output terminal of far infrared hot-probing instrument is connected into the input terminus of central processor CPU, and the control output end of CPU is communicated with gate valve switch control device in the converter;

CPU comprises:

1, be used to have the storing device of setting unit's cross section energy correlation data of the beam thermal radiation energy of the big small area of the various cross section of steel beam, this storing device is connected with comparer;

2, be used to receive the steel beam image of far infrared hot-probing instrument collection input and this sharp point position handled determine the image-region cut off value, union goes out the thermal radiation Energy value in the real-time section area value of beam, this cross section and the arithmetic processing apparatus of real-time energy per unit area value, and this device is connected with comparer;

3, be used for real-time energy per unit area value with set the comparer that unit cross section energy correlation data compares; This comparator output terminal is connected with the steering order device;

4, be used for the real-time energy per unit area value of comparer input is inputed to less than the unit cross section Energy value comparison momentary signal of the correlation data of setting the steering order device of hydro-pump switch controlling device.

Converter taphole is equipped with the translation gate valve, and this gate valve is opened and closed by hydro-cylinder control, and CPU steering order device keying signal is by switch controlling device primer fluid pressure motor, thus the keying of enforcement translation gate valve.

Molten steel, comprise that the mixed flow of molten steel and slag is than ambient air thermal radiation value height, therefore the cross section heat picture each point position thermal radiation value of far infrared hot-probing instrument being imported by CPU is determined the border point value in cross section, and calculates section area value, thermal radiation Energy value, energy per unit area value with frontier point bit image infinitesimal analysis.

Because molten steel thermal radiation Energy value height, slag thermal radiation Energy value is low, when sneaking into slag in the therefore same molten steel beam sectional area, the thermal radiation value of its unit surface is low during than clean steel water, as long as the control ratio amount upper limit of setting slag mixed volume is carried out set(ting)value and is compared to determine, just can realize hydro-pump switch controlling device oil supply oil supply cylinder, realize that tap hole translation gate valve opens and closes.

The core link of system is an image processing system, gather molten steel beam energy variation in real time, its real-time energy is carried out integral operation, calculate the dregginess in the beam, and mate with beam heat picture with the moment, both combine and realize identification to the beam slag, and realize the tapping of control slag in conjunction with slide plate pushing off the slag mechanism.

The core link of system is an image processing system, is responsible for finishing the identification to the beam slag, and concrete grammar is as described below:

(1) steel stream detect and obtaining of treatment zone carried out pre-treatment, obtain steel stream zone, for further slag recognizer is prepared.

A) with threshold value t1 image being carried out threshold value cuts apart

B) by the canny operator steel stream is carried out rim detection

Step1: use the Gaussian filter smoothing image;

$H(x,y)=e^{-\frac{a^2+b^2}{2{\mathrm{\σ}}^2}}$

G(x，y)＝f(m，n)*H(x，y)

Gauss's smooth function

Step2: with the finite difference of single order local derviation the assign to amplitude and the direction of compute gradient;

$H_1=\left|\begin{array}{cc}-1& -1\\ 1& 1\end{array}\right|$ $H_2=\left|\begin{array}{cc}1& -1\\ 1& -1\end{array}\right|$

First order difference convolution template

Step3: gradient magnitude is carried out non-maximum value suppress;

The gradient that only obtains the overall situation is not enough to determine the edge.For determining the edge, must keep the point of partial gradient maximum, and suppress non-maximum value.Utilize the direction of gradient carry out non-maximum value suppress (non-maxima suppression, NMS).

Step4: detect and adjoining edge with the dual threshold algorithm.

The typical method that reduces false edge section quantity is to N[i, j] use a threshold value, all values that will be lower than threshold value is composed null value.

Choose the dual threshold algorithm as solution.It suppresses two threshold tau 1 of image effect and τ 2 to non-maximum value, and 2 τ, 1 ≈ τ 2, obtains two threshold value edge image N1[i, j] and N2[i, j].Since N2[i, j] use high threshold to obtain, thereby contain false edge seldom, but interruption (not closed) is arranged.The dual threshold method is at N2[i, j] in the edge is connected into profile, when arriving the end points of profile, this algorithm is at N1[i, j] 8 adjoint point positions seek the edge can be connected on the profile, like this, algorithm is constantly at N1[i, j] in collect the edge, up to N2[i, j] couple together till.

C) for the image that detects the edge, be 10 with step-length s, from top to bottom image is scanned, obtain the width of steel stream at different heights.

D) choose a regional rectangular sub-regions territory of steel stream, as the input of slag detection next step down.

E) optimize.

● consider the pick up camera setting angle, steel stream upper and lower displacement gap in image is little in tapping process, so in the scanning process of step 3), can suitably dwindle sweep interval, promptly increases initial value and reduces end value.

● consider in the tapping process that it is a process slowly that the left and right displacement of steel stream on image changes, and when scanning about image is carried out, with incremental form sweep interval is changed.

(2) steel of single-frame images stream static nature extracts

A) histogram distribution of gray scale, the mean value of gradation of image and variance.

${\mathrm{\μ}}_n\left(r\right)=\underset{i=0}{\overset{L-1}{\mathrm{\Σ}}}{(r_i-m)}^{n}p\left(r_i\right)$

$m=\underset{i=0}{\overset{L-1}{\mathrm{\Σ}}}{r}_{i}p\left(r_i\right)$

${\mathrm{\μ}}_2\left(r\right)=\underset{i=0}{\overset{L-1}{\mathrm{\Σ}}}{(r_i-m)}^{n}p\left(r_i\right)$

R: interval [0, L-1] goes up the discrete random variable of discrete gray levels

P (r _i): gray level r _iThe probability estimate value that occurs

The histogram distribution of gray scale, average gray and variance are the descriptions to the integral image feature.

B) the intensity profile confidence level is 95%, and the fiducial interval of scope minimum

The most concentrated zone of intensity profile has been described in this interval

C) image level direction grey scale change trend

Be used for detecting slag at the texture that beam forms, judge whether to roll up slag

D) the equal gray scale of steel levelling

(3) the multiple image behavioral characteristics extracts

In tapping Safe period, to the maximum interval probability distribution of the accumulation gray scale Nogata of steel stream picture information.

(4) the hot-probing instrument detects the beam energy

Native system uses the infra-red heat detection instrument to detect the energy variation of beam simultaneously, because the variation of beam energy directly reflects the changing conditions of beam molten steel, slag content, therefore the beam energy signal of gathering is carried out the changing conditions that difference, statistical study can obtain the beam quantity of slag.

System gathers molten steel beam energy variation in real time, and its real-time energy is carried out integral operation, calculates the dregginess in the beam, and with mate with beam heat picture constantly, both combine and realize identification to slag.

(5) identification and the processing of volume slag phenomenon

A) origin cause of formation of volume slag

Because the density of molten steel is greater than the density of slag, therefore, in converter slag generally be positioned at molten steel above; And in tapping process, just have slag after molten steel has gone out and flow out.But because fully significantly boundary line is not arranged between molten steel and the slag, the existenceization slag is not thorough, and is subjected near the influence of the whirlpool of tap hole, the slag phenomenon just may occur rolling up.Volume slag phenomenon mainly is that molten steel and slag respectively account for a part in beam, not exclusively is that molten steel also not exclusively is a slag.

B) roll up the influence that slag causes

Comparatively unfavorable for detecting.The overall intensity of image is compared normal circumstances and is wanted high, does not reach the grey level when really slagging tap fully again, both might cause to postpone to trigger, and might cause again in advance and trigger.

C) weaken the method that the volume slag influences

Notice that under the volume slag situation, general slag is strip and distributes in beam.Therefore, in the horizontal sweep of beam image is analyzed, find that there is spike in its curve.Utilization is carried out the horizontal sweep of some lines to the beam image, can discern volume slag phenomenon.The slag if identification makes the test then abandons it.

(6) the following quantity of slag control of different steel grades

Shut fully to the mouth of a river constantly constantly by detecting down slag, the integration of beam area obtains in the interior image of this time period, calculate each quantity of slag down, as the value of feedback that following slag is detected Controlling System, set up the expert systems of different steel grade quantity of slag controls simultaneously, design control scheme, thus the sensitivity of detection system regulated, and realize of the requirement of different steel grades to the quantity of slag under the difference.

Claims (1)

1, slag proofing unit under the converter, it is characterized in that at the converter platform or at alignment lens can the be tapped avris orientation fixed installation far infrared hot-probing instrument of beam of stove upper/lower positions, the output terminal of far infrared hot-probing instrument is connected into the input terminus of central processor CPU, and the control output end of CPU is communicated with gate valve switch control device in the converter;

CPU comprises:

1. be used to have the storing device of setting unit's cross section energy correlation data of the beam thermal radiation energy of the big small area of the various cross section of steel beam, this storing device is connected with comparer;

2. be used to receive the steel beam image of far infrared hot-probing instrument collection input and the image-region cut off value is determined in this sharp point position processing, union goes out the thermal radiation Energy value in the real-time section area value of beam, this cross section and the arithmetic processing apparatus of real-time energy per unit area value, and this device is connected with comparer;

3. be used for real-time energy per unit area value with set the comparer that unit cross section energy correlation data compares; This comparator output terminal is connected with the steering order device;

4. be used for the real-time energy per unit area value of comparer input is inputed to less than the unit cross section Energy value comparison momentary signal of the correlation data of setting the steering order device of hydro-pump switch controlling device.

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