CN104907515A - Liquid level control system and liquid level measuring method based on oblique photography - Google Patents

Liquid level control system and liquid level measuring method based on oblique photography Download PDF

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Publication number
CN104907515A
CN104907515A CN201510357368.8A CN201510357368A CN104907515A CN 104907515 A CN104907515 A CN 104907515A CN 201510357368 A CN201510357368 A CN 201510357368A CN 104907515 A CN104907515 A CN 104907515A
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liquid level
nozzle bag
nozzle
graduation mark
level
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CN201510357368.8A
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CN104907515B (en
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张宗宁
唐明明
张倩倩
王肇飞
姚志强
史戈平
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Yantai Wanlong Vacuum Metallurgy Co Ltd
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Yantai Wanlong Vacuum Metallurgy Co Ltd
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Abstract

The invention relates to a liquid level control system and liquid level measuring method based on oblique photography, wherein the liquid level control system comprises a nozzle bag; a nozzle bag cover is set on an upper portion of the nozzle bag; the nozzle bag cover is provided with a glass observation window; the glass observation window is provided with a scale; the liquid level height inside the nozzle bag and the inner wall of the nozzle bag are formed a liquid lever cross line; the scale is parallel to the liquid level cross line; a CCD camera is set above the nozzle bag in an inclined way; the liquid level cross line inside the nozzle bag is captured through an optical shaft of the CCD camera by penetrating through the glass observation window; the liquid level cross line, the scale and the lens focus of the CCD camera are in the same surface; a data transmission line is connected between the CCD camera and a PC machine; and the glass observation window is an oval shape. According to the invention, the liquid level control system and liquid level measuring method provided herein has the advantages of high measuring accuracy, rapid measuring speed, simple structure, easy removal and installation and low cost; the surface of an amorphous thin belt is bright; the figure of the fish scale is not obvious; and the quality of the amorphous thin belt is improved.

Description

A kind of tank level control system based on oblique photograph and level measuring method
Technical field
The present invention relates to a kind of tank level control system based on oblique photograph and level measuring method, belong to amorphous thin ribbon processing technique field.
Background technology
Amorphous thin ribbon preparation adopts rapid solidification (cooling rate 10 6dEG C/s) planar flow casting technology for making, by high-temperature molten steel by slot injection on High Rotation Speed chill roll roll surface, this technique is between long flow process thin-belt casting rolling process shortens to grade roller mouth and only one meter of left and right diameter chill roll, and the factor of all restriction strip performances will more be concentrated, complicated difficult control.At present, the amorphous that automatic controlling level is higher gets rid of carrying device and mostly is foreign-made, and amorphous, nano-crystalline thin ribbon occupy nearly 70% share in domestic market." 12 " latter stage, many ton amorphous band production lines were gone into operation, but the automatic control level of production domesticization is not high, and strip quality and magnetic property with there is very large gap abroad, still do not possess the passive situation breaking foreign technology blockade and dependence on import.
Permanent liquid level is the uniform necessary condition of amorphous strip thickness, high-quality amorphous thin ribbon and liquid level and expulsion pressure closely related.Liquid level change will affect thickness and horizontal stroke, longitudinal tolerance and the surface quality of amorphous thin ribbon.When spray bag liquid level is on the low side, spray band pressure can be caused inadequate, and strip pastes roller difficulty, occurs intensive hole; When liquid level is higher, the corresponding raising of chill roll rotating speed, technique destabilizing factor occurs thereupon, and spray bag also may be caused excessive; Permanent liquid level the most rambunctious, can affect weld pool Flow Field Distribution and turbulent flow, causes that strip thickness, inhomogeneous cooling are even, embrittlement.
In existing level measuring technology, usually there are contact and non-contact measurement.High temperature, the intense radiant heat and adverse circumstances etc. of metal bath make the contact type measurements such as instrumentation can not use at all, and measured by fly rod or liquid level floater mediate contact, by liquid fluctuating, composition, density and effect of surface tension, fly rod immersion depth and registration will change to some extent, these Recessive elementS can have influence on the control of liquid level, and buoy can pollute the degree of purity of alloy melt in addition; Non-contact infrared, electric capacity, ultrasonic wave and laser sensor affect by environmental change, antijamming capability, resolving power be low, measure and systematic error is large limits its application, and the radiation technique such as radioactive source and X-ray certainty of measurement is high, but personal safety is endangered greatly and apparatus expensive.Along with the progress of photoelectron technology and camera work, CCD photogrammetric technology affects little by environment and melt, equipment is simple and reliable, adopt high-resolution front CCD photography detection method can realize non-cpntact measurement and the control of high-temperature fusant liquid level preferably, in addition, existing CCD industrial camera is to liquid level photography in nozzle bag, and due to liquid level sight line for spray bag stops, positive photograph ccd video camera cannot monitor liquid level.
Summary of the invention
The present invention is directed to the deficiency that above-mentioned prior art exists, a kind of non-contact liquid level controlling system based on oblique photograph technology and level measuring method are provided, utilize the ccd video camera of oblique photograph to obtain the image information of the level change in nozzle bag, in time Survey control is carried out to the liquid level in nozzle bag.
The technical scheme that the present invention solves the problems of the technologies described above is as follows: a kind of tank level control system based on oblique photograph, comprise nozzle bag, the described nozzle portion of wrapping is provided with nozzle clad, described nozzle clad is provided with quartz glass observation window, described glass window is provided with graduation mark, the inwall of the liquid level in described nozzle bag and described nozzle bag forms liquid level intersection, described graduation mark is parallel to described liquid level intersection, the inclined upward of described nozzle bag is provided with ccd video camera, the optical axis of described ccd video camera can photograph the liquid level intersection in described nozzle bag through described glass window, described liquid level intersection, the camera lens focus of graduation mark and described ccd video camera is coplanar, described ccd video camera is connected with PC by data transmission link.
Described liquid level intersection is the boundary line between the face of liquid in described nozzle bag and the inwall of described nozzle bag.
Described quartz glass observation window is oval, and the thickness of the quartz glass adopted is 1 ~ 2mm.The thickness of preferred quartz glass is 1.5mm.For preventing serious refraction effect, improve measurement accuracy, quartz glass should select suitable thickness, and ellipse mates with the oblique view window on spray clad and camera tilt angle, and oval quartz glass can meet needed for level gauging and the shooting visual field.
Described nozzle clad is provided with liquid injection port, and described liquid injection port adopts immersion running channel.Liquid level when guaranteeing to inject liquid in nozzle bag in nozzle bag is tranquil, not disturbance liquid level.
Described liquid level intersection, graduation mark parallel, and liquid level intersection, graduation mark, camera lens focus are coplanar.Liquid level intersection moves in the vertical direction, the coincidence line of the scale value on liquid level intersection and quartz glass observation window moves in the horizontal direction, when liquid level intersection rises or declines, the imaging picture that the graduation mark that ccd video camera can observe liquid level intersection and quartz glass observation window overlaps, picture passes to PC by data conveying circuit, is then intuitively shown by the screen of PC.
The invention has the beneficial effects as follows: adopt the liquid level in contactless CCD camera tilt gaging nozzle bag, the molten steel of measurement device not in contact nozzle bag, liquid level can not flow, fluctuates or be oxidized floating thing and all not affect measurement; Certainty of measurement is high, and liquid fluctuating is little, liquid level can be stabilized in ± the even less excursion of 3mm in, the expulsion pressure of nozzle bag can control at 0.03Kg/cm 2in scope.Certainty of measurement of the present invention is high, measuring speed is fast, structure is simple, easy to assemble, cost is low, amorphous thin ribbon surface-brightening, and " scalelike mark " is not obvious, and blibbing size is little, quantity is few, and density increases, and improves amorphous thin ribbon quality.
The invention also discloses a kind of level measuring method, comprise the image obtaining corresponding graduation mark on liquid level in nozzle bag and observation window, the graduation mark that liquid level in nozzle bag is converted on observation window, for indicating the liquid level in corresponding nozzle bag, measures by described graduation mark.
The level altitude of described ccd video camera camera lens is h, angle of inclination is θ, liquid level in captured nozzle bag is c, corresponding graduation mark c '=h ˙ [tan (θ)-tan (α)]+a at windowpane, wherein, θ ∈ [α, β], minimum level in the scope nozzle bag that ccd video camera camera lens can be taken is a, corresponding angle of inclination is α, most high liquid level (HLL) is b, and corresponding angle of inclination is β, and the division of quartz window high scale line indicates according to above-mentioned formula.On the liquid level that video camera photographs and windowpane, the image of the fluid level scale of corresponding graduation mark, directly can read corresponding liquid level in nozzle bag by this image, efficient and convenient.
The invention has the beneficial effects as follows, by above-mentioned level measuring method, the fluid level scale that the liquid level of being taken in time in nozzle bag by the ccd video camera be obliquely installed is changed and windowpane high scale line correspondence indicates, the liquid level in captured nozzle bag is directly read fast by the display of PC, without the need to identify image and post-processed just can calculate captured liquid level by operations such as complicated functions in other words again, in a word, structure of the present invention is simple, swift and convenient to operate, directly liquid level is read by graduation mark, in time detection control is carried out to the liquid level in nozzle bag.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is liquid level variable condition schematic diagram of the present invention;
Fig. 3 is that quartz glass observation window graduation mark of the present invention divides schematic diagram;
In figure, 1, ccd video camera; 2, liquid level; 3, glass window; 4, liquid injection port; 5, nozzle bag; 6, nozzle clad; 7, minimum liquid level; 8, the highest liquid level.
Detailed description of the invention
Be described principle of the present invention and feature below in conjunction with example, example, only for explaining the present invention, is not intended to limit scope of the present invention.
As shown in Figure 1, a kind of tank level control system based on oblique photograph, comprise nozzle bag 5, the described nozzle portion of wrapping is provided with nozzle clad 6, described nozzle clad 6 is provided with quartz glass observation window 3, described glass window is provided with graduation mark, liquid level 2 in described nozzle bag forms liquid level intersection with the inwall of described nozzle bag, described graduation mark is parallel to described liquid level intersection, the inclined upward of described nozzle bag is provided with ccd video camera 1, the optical axis of described ccd video camera can photograph the liquid level intersection in described nozzle bag through described glass window, described liquid level intersection, the camera lens focus of graduation mark and described ccd video camera is coplanar, described ccd video camera is connected with PC by data transmission link.
The quartz glass thickness of quartz glass observation window of the present invention is 1 ~ 2mm, is preferably 1.5mm.The quartz glass thickness of quartz window is moderate, prevents light from excessively refraction occurring, affects certainty of measurement.
During oblique photograph, light therethrough different medium generation refraction effect is inevitable, and cause the imaging of liquid level intersection more higher than actual liquid level intersection, quartz glass is thicker, reflects more obvious, the imaging of liquid level intersection and actual intersection level imbalance larger.For preventing serious refraction effect, improve measurement accuracy, quartz glass should select suitable thickness, and quartz glass thickness should be determined according to the refractive index of purple shortwave (380nm ~ 430nm) correspondence in visible ray.When being with for making the imaging of liquid level intersection and actual liquid level deviation be no more than to spray, liquid level allows to change ± the scope of 3mm, and quartz glass thickness can not more than 3mm.
The liquid level intersection that in the inwall of the nozzle bag of shot by camera and nozzle bag, the liquid level of liquid level is formed is straight line, and this straight line is the straight line paralleled with windowpane graduation mark.Described quartz glass observation window place plane is parallel with the liquid level in described nozzle bag.
Described glass window is oval, the quartz glass matched with glass window is also elliptic design, it not only mates with the oblique view window on spray clad and camera tilt angle, and oval quartz glass can meet needed for level gauging and the shooting visual field.Graduation mark along transverse is longer, and reflection liquid level excursion is larger, and the vertical visual field that can take is larger, and the direction parallel with liquid level intersection does not need not reflect liquid level yet changes, therefore this direction is to the no requirement (NR) of quartz glass size, and this direction opening is less, and molten steel heat radiation is less.Oval axial ratio just meets this graduation mark and divides, and meets the large visual field and little heat radiation requirement simultaneously.Guarantee that light that is the highest and minimum liquid level intersection place always can not stopped through observation window edge, so that the liquid level information of ccd video camera shooting is delivered to PC in time, handled easily person observes the liquid level in nozzle bag by the display interface of PC, regulate in time to the liquid level in nozzle bag.
Described nozzle clad is provided with liquid injection port 4, and described liquid injection port adopts immersion running channel.Liquid level when guaranteeing to inject liquid in nozzle bag in nozzle bag is tranquil, not disturbance liquid level.
Described liquid level intersection, graduation mark parallel, and liquid level intersection, graduation mark, camera lens focus are coplanar.Liquid level intersection moves in the vertical direction, the coincidence line of the graduation mark on liquid level intersection and quartz glass observation window moves in the horizontal direction, when liquid level intersection rises or declines, ccd video camera can observe the imaging picture of the graduation mark coincidence line of liquid level intersection and quartz glass observation window, picture passes to PC by data conveying circuit, is then intuitively shown by the screen of PC.
The invention still further relates to a kind of level measuring method, comprise the image obtaining corresponding graduation mark on liquid level in nozzle bag and observation window, the fluid level scale that the graduation mark that liquid level in nozzle bag is converted on observation window presents, for indicating the liquid level in corresponding nozzle bag, measures by described graduation mark.
The level altitude of described ccd video camera camera lens is h, angle of inclination is θ, liquid level in captured nozzle bag is c, corresponding graduation mark c '=h ˙ [tan (θ)-tan (α)]+a at windowpane, wherein, θ ∈ [α, β], the minimum level in the scope nozzle bag that ccd video camera camera lens can be taken is a, and corresponding angle of inclination is α, most high liquid level (HLL) is b, and corresponding angle of inclination is β.The division of the graduation mark on quartz window is undertaken indicating by above-mentioned formula.
As shown in Figure 2, described ccd video camera is by the change of quartz glass observation window tilt liquid level, ccd video camera fixes proper height h and angle of depression tilt, the optical axis of ccd video camera and the angle of vertical line are greater than α and are less than β, liquid level intersection c moves in the vertical direction, and the coincidence line c ' of liquid level intersection and graduation mark moves in the horizontal direction.When liquid level rises or declines, taken minimum liquid level 7 is a, and the highest liquid level 8 is b, a, b wide ranges is about 250mm, and the shooting distance of ccd video camera is greater than 500mm, realizes wide-long shot, and video camera disturbs away from the heat radiation of high-temperature fusant.Graduation mark c ' on windowpane is determined by h ˙ [tan (θ)-tan (α)]+a, θ ∈ [α, β], θ is the optical axis of ccd video camera and the angle of vertical line, actual liquid level intersection c is reflected accordingly by above-mentioned light path geometrical relationship, liquid level intersection even variation in vertical height, and the liquid level of PC display screen picture display is according to tan nonlinear change, the scale unequal interval namely on windowpane.Quartz glass observation window graduation mark divides schematic diagram as shown in Figure 3, and the fluid level scale presented by quartz glass observation window graduation mark directly can read corresponding liquid level in nozzle bag, efficient and convenient.
Operating personnel carry out Liquid level by observing PC display screen picture, when liquid level display is close to pre-determined lower limit, can starts cylinder and open stopper, supplement molten steel in time in nozzle bag; When showing liquid level close to preset upper limit, close stopper, stop supplementing molten steel, after cyclic brake, liquid level is tending towards constant.During for making injection molten steel, not disturbance liquid level, by controlling liquid level, after spray band constant pressure, the surface quality such as the surface roughness of amorphous band, fineness and " scalelike mark " is obviously optimized.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (6)

1. the tank level control system based on oblique photograph, comprise nozzle bag, the described nozzle portion of wrapping is provided with nozzle clad, it is characterized in that, described nozzle clad is provided with quartz glass observation window, described glass window is provided with graduation mark, the inwall of the liquid level in described nozzle bag and described nozzle bag forms liquid level intersection, described graduation mark is parallel to described liquid level intersection, the inclined upward of described nozzle bag is provided with ccd video camera, the optical axis of described ccd video camera can photograph the liquid level intersection in described nozzle bag through described glass window, described liquid level intersection, the camera lens focus of graduation mark and described ccd video camera is coplanar, described ccd video camera is connected with PC by data transmission link.
2. the tank level control system based on oblique photograph according to claim 1, is characterized in that, described quartz glass observation window is oval, and the thickness of the quartz glass adopted is 1 ~ 2mm.
3. the tank level control system based on oblique photograph according to claim 2, is characterized in that, the thickness of the quartz glass that described quartz window adopts is 1.5mm.
4. the tank level control system based on oblique photograph according to claim 1 or 2 or 3, is characterized in that, described nozzle clad is provided with liquid injection port, and described liquid injection port adopts immersion running channel.
5. a level measuring method, it is characterized in that, comprise the image obtaining corresponding graduation mark on liquid level in nozzle bag and observation window, the graduation mark that the liquid level in nozzle bag is converted on observation window, for indicating the liquid level in corresponding nozzle bag, measures by described graduation mark.
6. level measuring method according to claim 4, it is characterized in that, the level altitude of described ccd video camera camera lens is h, angle of inclination is θ, liquid level in captured nozzle bag is c, corresponding graduation mark c '=h ˙ [tan (θ)-tan (α)]+a at windowpane, wherein, θ ∈ [α, β], minimum level in the scope nozzle bag that ccd video camera camera lens can be taken is a, corresponding angle of inclination is α, most high liquid level (HLL) is b, corresponding angle of inclination is β, the division of quartz window high scale line indicates according to above-mentioned formula.
CN201510357368.8A 2015-06-25 2015-06-25 A kind of tank level control system based on oblique photograph and level measuring method Active CN104907515B (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105607661A (en) * 2015-12-21 2016-05-25 南宁学院 Liquid level control system based on image identification

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0814992A (en) * 1994-06-29 1996-01-19 Hitachi Ltd Method and instrument for measuring height of liquid level using picture processor
CN101807082A (en) * 2010-03-18 2010-08-18 重庆市正川玻璃有限公司 High-temperature glass liquid level height shooting control method for glass kiln furnace
CN202461467U (en) * 2011-11-21 2012-10-03 滕州高科康纳合金材料有限公司 Plunger type equal liquid level pressure amorphous belt building machine
CN103398753A (en) * 2013-08-21 2013-11-20 冶金自动化研究设计院 Machine vision based device and method for detecting flotation liquid level on line
CN204700260U (en) * 2015-06-25 2015-10-14 烟台万隆真空冶金股份有限公司 A kind of tank level control system based on oblique photograph

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0814992A (en) * 1994-06-29 1996-01-19 Hitachi Ltd Method and instrument for measuring height of liquid level using picture processor
CN101807082A (en) * 2010-03-18 2010-08-18 重庆市正川玻璃有限公司 High-temperature glass liquid level height shooting control method for glass kiln furnace
CN202461467U (en) * 2011-11-21 2012-10-03 滕州高科康纳合金材料有限公司 Plunger type equal liquid level pressure amorphous belt building machine
CN103398753A (en) * 2013-08-21 2013-11-20 冶金自动化研究设计院 Machine vision based device and method for detecting flotation liquid level on line
CN204700260U (en) * 2015-06-25 2015-10-14 烟台万隆真空冶金股份有限公司 A kind of tank level control system based on oblique photograph

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105607661A (en) * 2015-12-21 2016-05-25 南宁学院 Liquid level control system based on image identification

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