CN103776515A - Dynamic liquid level height measuring device and dynamic liquid level height measuring method as well as closed-loop control system and closed-loop control method - Google Patents
Dynamic liquid level height measuring device and dynamic liquid level height measuring method as well as closed-loop control system and closed-loop control method Download PDFInfo
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- CN103776515A CN103776515A CN201410015645.2A CN201410015645A CN103776515A CN 103776515 A CN103776515 A CN 103776515A CN 201410015645 A CN201410015645 A CN 201410015645A CN 103776515 A CN103776515 A CN 103776515A
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Abstract
The invention relates to a dynamic liquid level height measuring device and a measuring method as well as a closed-loop control system based on the measuring device and a control method. An image of a floater rod which is floated in liquid and is varied in height along the liquid level change is collected in real tine by utilizing a camera system, the image is processed by a data processor in real time to obtain a dynamic height of the floater rod, so that the dynamic measurement of the liquid level height is realized; a PLC (programmable logic controller) control system is connected with the data processor of the dynamic liquid level height measuring device to obtain a variation value of the height of the liquid level to be measured, the PLC control system obtains the control quantity according to the variation value obtained by the data processor and transmits the control quantity to a plug rod actuating mechanism, the plug rod actuating mechanism controls a plug rod according to the control quantity so as to adjust the volume of the liquid flowing into a guide port of a guide mechanism from a liquid supplementing port and to realize the closed-loop control on the liquid level height in a vessel to be measured. The device is simple, the reliability is strong, the measuring and control precision is high, and the cost is low.
Description
Technical field
The invention belongs to and measure and automatic control technology field, the specifically on-line automatic survey sensor of a kind of dynamic liquid level height and closed-loop control system and method.
Background technology
In the process of amorphous alloy Cast Strip, in nozzle bag, molten steel liquid level height is to affect amorphous alloy strips thickness in one of inhomogeneity key factor of length direction, in order to obtain the continuous amorphous band of even thickness, must molten steel liquid level height in nozzle bag be measured accurately and be controlled.In the prior art, the method that is applicable to measure molten steel liquid level height mainly contains float method, ultrasonic method and rays method.
Float method level gauging is to utilize fluid mechanics law of buoyancy, determines the height of liquid level by detecting the position of float on liquid level.Float method is measured liquid level to be had direct measurement float position and indirectly measures two kinds of modes of float position, in commercial production, all has a wide range of applications.But, no matter be that direct float position metering system or indirect float position metering system all exist certain problem when at measurement molten steel liquid level height, due to steel ladle hot environment around, the position of directly measuring float in steel ladle is difficult to; Indirectly measure float seat, for example adopting the mechanism such as mechanical lever or pulley molten steel outside can be passed to in the position of float measures, but in transmittance process, all there are certain hysteresis and error, on the one hand these two kinds of modes all can not meet in the process of amorphous alloy Cast Strip the needs of measuring when molten steel liquid level height high-precision real in nozzle bag, and two kinds of modes are difficult to directly send the molten steel liquid level height of measurement to control system with the form of electric signal on the other hand.
In real world applications, also some patent adopts float method level gauging, if China Patent Publication No. is CN103398757A, name is called in " a kind of pick-up unit that sprays molten steel liquid level in band bag " has announced a kind of pick-up unit that sprays molten steel liquid level in band bag, this device comprises float 3, float lever 2, liquid level testing agency 1, PLC system 5, wherein: float lever 2 bottoms are arranged on float 3, top is through the orienting sleeve on spray band bag 7, float 3 directly contacts the molten steel 8 in spray band bag 7, drive float lever 2 to reflect molten steel 8 liquid levels, liquid level testing agency 1 is provided with Fibre Optical Sensor 4, described Fibre Optical Sensor 4 is for detection of the change in displacement at float lever 2 tops, and testing result is fed back to PLC system 5, described PLC system 5 calculates current molten steel 8 liquid levels according to testing result.
But the liquid level testing agency in this patent is arranged on the top of molten steel; and the liquid steel temperature melting is 1500 ℃ of left and right; although the Fibre Optical Sensor of this patent can bear the high temperature of 300 ℃ of left and right; but be nowhere near, therefore in actual applications, described liquid level testing agency still needs additional temperature protective device; and high temperature also can impact accuracy of measurement; and the loss of increase device, make its lost of life, easily damage.
Summary of the invention
For this reason, the present invention will solve liquid level testing agency in prior art and be arranged on molten steel top, be subject to temperatures involved device lifetime and accuracy of measurement, for solving the problems of the technologies described above, the invention provides a kind of dynamic liquid level height survey sensor and closed-loop control system and the method that can measure at a distance, avoid current hot environment to disturb.
For solving the problems of the technologies described above, the present invention by the following technical solutions:
A kind of dynamic liquid level height measuring device, comprise the float on the testing liquid being arranged in testing container, described float one end is arranged in testing liquid, the other end connects float lever, described float lever stretches out through guiding mechanism, and described float lever can move along with moving of float along described guiding mechanism, also comprise image collecting device and the data processor being connected with this image collecting device, image acquisition is carried out in the extension that described image collecting device is positioned at outside described guiding mechanism described float lever, described data processor is positioned at the length of the extension outside described guiding mechanism according to float lever described in the image calculation gathering, thereby obtain the height of described liquid level to be measured.
Described image collecting device is arranged on testing container one side, and described image collecting device comprises camera lens and camera head, and described lens direction is vertical with described float lever bearing of trend.
On the camera lens of described image collecting device, be provided with light source.
Described float adopts density to be less than the fire resistive material of described testing liquid density and is hollow-core construction, described float lever adopts density to be less than described testing liquid density, smooth surface and opaque tubular fire material, and described guiding mechanism adopts the smooth refractory metal of inside surface.
Described float adopts Tercod to fire and forms, and described float lever adopts alumina ceramic material, and described float and described float lever adopt high-temperature cement bonding.
Measurement computing method that adopt the dynamic liquid level height measuring device described in 1-5, comprise the following steps:
Described image collecting device carries out image acquisition to the extension of the float lever outside guiding mechanism, and the realtime graphic collecting is sent to data processor;
Calculate calibration coefficient C, measure described float lever and be positioned at the length L 0 of the extension outside described guiding mechanism, then described data processor calculates the length L of the imaging of described extension, calibration coefficient C=L0/L by pixel computing method;
Secondly, calculate the initial length of the extension of described float lever, described image collecting device carries out image acquisition to the extension of described float lever, obtain the imaging of the extension of described float lever, described data processor obtains the length L 1 ' of described imaging according to pixel computing method, now the length of the extension of described float lever is L1=C × L1 ';
When after the length variations of the extension of described float lever, described image collecting device carries out image acquisition to the extension of described float lever, obtain the imaging of the extension of described float lever, described data processor obtains the length L 2 ' of described imaging according to pixel computing method, now the length of the extension of described float lever is L2=C × L2 '; Now the length variations of the extension of described float lever is: △ t=L2-L1, and the length variations of the extension of described float lever is consistent with the variation of described liquid level, and now liquid level changing value is △ t.
The step that described image collecting device gathers the extension of the float lever outside guiding mechanism is specially: under the irradiation of light source, camera lens is imaged on the height of the float lever that is exposed to guiding mechanism top on the photo-sensitive cell of camera head, and the real image that camera head becomes float lever on photo-sensitive cell is sent to data processor in real time.
A kind of closed-loop control system, comprise testing container and fluid infusion container, in described testing container, be provided with testing liquid, in described fluid infusion container, be provided with liquid make-up, the fluid infusion mouth of described fluid infusion container is opened or is closed by stopper rod actuating mechanism controls stopper rod, and described fluid infusion mouth aligns with the draining hole in described testing container, on described testing container, be provided with the dynamic liquid level height measuring device described in described claim 1-6, PLC control system is connected with the data processor of described dynamic liquid level height measuring device, obtain liquid level changing value to be measured, and be converted into steering order and export to stopper rod topworks.
The liquid level numerical value that described PLC control system draws according to described data processor and setting value contrast draw controlled quentity controlled variable, and send to described stopper rod topworks, described stopper rod topworks is according to stopper rod described in controlled quentity controlled variable control, regulates the amount that flows into the liquid the draining hole of described drainage mechanism from described fluid infusion mouth.
A control method that adopts the closed-loop control system described in claim 8 or 9, comprises the following steps:
(1) float lever that described image collecting device exposes guiding mechanism top carries out image acquisition, and the realtime graphic collecting is sent to data processor;
(2) calculate calibration coefficient C, measure the length L 0 that is positioned at the extension outside described guiding mechanism, then described data processor calculates the length L of the imaging of described extension, calibration coefficient C=L0/L by pixel computing method;
(3) calculate the initial length of the extension of described float lever, described image collecting device carries out image acquisition to the extension of described float lever, obtain the imaging of the extension of described float lever, described data processor obtains the length L 1 ' of described imaging according to pixel computing method, now the length of the extension of described float lever is L1=C × L1 ';
(4) when after the length variations of the extension of described float lever, described image collecting device carries out image acquisition to the extension of described float lever, obtain the imaging of the extension of described float lever, described data processor obtains the length L 2 ' of described imaging according to pixel computing method, now the length of the extension of described float lever is L2=C × L2 '; Now the length variations of the extension of described float lever is: △ t=L2-L1, the variation of the extension of described float lever is consistent with the variation of described liquid level, now liquid level changing value is △ t, and described data processor is by the liquid level changing value △ t obtaining and send to PLC control system;
(5) described PLC control system sends order to described stopper rod topworks according to this liquid level changing value △ t, described stopper rod topworks controls the aperture of described stopper rod according to order, regulate the amount that flows into the liquid the draining hole of described drainage mechanism from described fluid infusion mouth.
Described step (1) is specially: under the irradiation of light source, camera lens is imaged on the float lever that is exposed to guiding mechanism top on the photo-sensitive cell of camera head, and the real image that camera head becomes float lever on photo-sensitive cell is sent to data processor in real time.
Technique scheme of the present invention has the following advantages compared to existing technology,
(1) dynamic liquid level height measuring device of the present invention, comprise the float on the testing liquid being arranged in testing container, described float one end is arranged in testing liquid, the other end connects float lever, described float lever stretches out through guiding mechanism, and described float lever can move along with moving of float along described guiding mechanism, also comprise image collecting device and the data processor being connected with this image collecting device, image acquisition is carried out in the extension that described image collecting device is positioned at outside described guiding mechanism described float lever, described data processor is positioned at the length of the extension outside described guiding mechanism according to float lever described in the image calculation gathering, thereby obtain the height change value of described liquid level to be measured, described image collecting device is arranged on testing container one side, the present invention carries out telemeasurement by the image collecting device that is arranged on a side, adopt high-precision image collecting device, guarantee image acquisition degree of accuracy, and make image collecting device away from testing container top, avoid high temperature or other corrosive substances in testing container to damage image collecting device, cause its life-span short, flimsy problem.
(2) dynamic liquid level height measuring device of the present invention, on the camera lens of described image collecting device, be provided with light source, light source is set and has guaranteed that the float lever image and the background image that collect have higher contrast, float lever border can be always by clear identification exactly, can, because of the impact such as working environment, light, not guarantee the accuracy of image acquisition and graphical analysis.
(3) dynamic liquid level height measuring device of the present invention, described float adopts density to be less than the fire resistive material of fluid density and is hollow-core construction, described float lever adopts density to be less than fluid density, smooth surface and opaque tubular fire material, described guiding mechanism adopts the smooth refractory metal of inside surface, the material of described float and float lever is in order to float over liquid surface by it always, and be the material of fireproof high-temperature resistant, make it can be applied in a lot of occasions, adapt to severe working environment.
(4) the measurement computing method of dynamic liquid level height measuring device of the present invention, calculate liquid level variation by calculating calibration coefficient, liquid level can be multiplied by calibration coefficient by pixels tall corresponding to float lever height recording and obtain, as long as float lever position, lens location do not change, calibration coefficient is just constant, can also demarcate at any time according to field requirement and actual conditions in addition, computing method are simply accurate.
(5) closed-loop control system of the present invention, comprise testing container and fluid infusion container, in described testing container, be provided with testing liquid, in described fluid infusion container, be provided with liquid make-up, the fluid infusion mouth of described fluid infusion container is opened or is closed by stopper rod actuating mechanism controls stopper rod, and described fluid infusion mouth aligns with the draining hole in described testing container, on described testing container, be provided with described dynamic liquid level height measuring device, PLC control system is connected with the data processor of described dynamic liquid level height measuring device, obtain the variation of liquid level to be measured, and be converted into steering order and export to stopper rod topworks, native system utilizes camera head Real-time Collection to swim in the image that the float lever height in liquid changes with liquid level, after processing in real time, data processor obtains the dynamic height of float lever, and then realize the kinetic measurement of liquid level, data processor sends the liquid level value recording to PLC automatic control system simultaneously, and PLC control system pours into the amount of the liquid of testing container by stopper rod control gear adjustment fluid infusion container, realize the closed-loop control to liquid level in testing container.
Accompanying drawing explanation
For content of the present invention is more likely to be clearly understood, below according to a particular embodiment of the invention and by reference to the accompanying drawings, the present invention is further detailed explanation, wherein
Fig. 1 is the structural representation of an embodiment of dynamic liquid level height measuring device of the present invention;
Fig. 2 is the liquid level variation diagram to be measured of an embodiment of dynamic liquid level height measuring device measurement of the present invention;
Fig. 3 is the liquid level variation diagram to be measured of an embodiment of closed-loop control system closed-loop control of the present invention.
In figure, Reference numeral is expressed as: 1-float, 2-float lever, 3-guiding mechanism, 4-testing container, 5-testing liquid, 7-draining hole, 9-light source, 10-camera lens, 11-camera head, 13-data processor, 14-stopper rod, 15-stopper rod topworks.
Embodiment
The specific embodiment of the present invention is provided below.
embodiment 1
The present embodiment provides a kind of dynamic liquid level height measuring device, comprises testing container 4, the device for molten steel height is measured in the present embodiment, and therefore described testing container 4 is steel ladle, testing liquid 5 is molten steel.The float 1 being provided with on molten steel in testing container 4, described float 1 one end is arranged in molten steel, floats on molten steel, and along with liquid height changes and fluctuates, the other end connects float lever 2, and described float lever 2 stretches out through guiding mechanism 3.Guiding mechanism 3 herein adopts refractory metal, it has through hole through testing container 4 walls and its centre, and through-hole wall is smooth, float lever 2 passes from this through hole, described float lever 2 can move along with moving of float 1 along described guiding mechanism 3, described float 1 adopts density to be less than the fire resistive material of fluid density and hollow-core construction preferably, guarantee float 1 can be stable float on molten steel, float 1 preferably Tercod is fired and is formed, carbofrax material good heat resistance, little and the acid and alkali-resistance of expansion coefficient, it is extraordinary float 1 material, float 1 is hollow-core construction, described float 1 is of a size of external diameter 50mm, interior through 40mm, outer high 60mm, interior high 45mm, described float lever 2 adopts density to be less than fluid density, smooth surface and opaque tubular fire material, preferably alumina ceramic tube of float lever 2, float lever 2 is of a size of external diameter 10mm, interior through 6mm, described float 1 and described float lever 2 adopt high-temperature cement bonding, guarantee the stable connection between it.
This device also comprises image collecting device and the data processor 13 being connected with this image collecting device, the preferred image processing analysis software adopting in industrial control computer of described data processor 13, adopt LabVIEW8.2 and Vision8.2 to work out, it is vertical with described float lever 2 that described image collecting device is preferably arranged on testing container 4 one sides, described image collecting device comprises camera lens 10 and camera head 11, due at vertical angle, the image of taking does not need to consider the problem of angle in the time calculating, if and 2 one-tenth 60 degree angles of camera lens 10 and float lever, during by image calculation float lever 2 length, also need angle calculation to enter, increase the complexity of calculating, so it is vertical with described float lever 2 preferably camera lens 10 to be arranged on to a side, the preferred f=48mm optical lens that adopts of described camera lens 10, the preferred MVC800DAM-GE45 HD digital ccd video camera adopting with gigabit ethernet interface of camera head 11, on the camera lens 10 of described image collecting device, be preferably provided with light source 9, described light source 9 adopts source of parallel light in the present embodiment, can guarantee that this image collecting device is not affected by extraneous light etc., make float lever 2 have enough brightness, guarantee the accuracy gathering.
Image acquisition is carried out in the extension that described image collecting device is positioned at outside described guiding mechanism 3 described float lever 2, described data processor 13 is positioned at the length of the extension outside described guiding mechanism 3 according to float lever 2 described in the image calculation gathering, thereby obtain the height change value of molten steel liquid level, this device carries out telemeasurement by the image collecting device that is arranged on a side, adopt high-precision image collecting device, guarantee collection degree of accuracy, and make image collecting device away from steel ladle top, avoid high temperature or other corrosive substance failure pattern pictures of the molten steel in steel ladle to adopt device, cause its life-span short, flimsy problem.
The embodiment that can change as other, described testing container 4 can be for needing to measure the container of liquid level in other industry, described float 1 and float lever 2 also can adopt color density to be less than the fire resistive material of fluid density and adopt other suitable sizes, described data processor 13 also can adopt other can process the device of image, described camera lens 10 can also adopt other camera lenses, described camera head 11 can also adopt other high definition camera devices, and described light source 9 can also adopt other light sources.
Kind of the present invention adopts the measurement computing method of the dynamic liquid level height measuring device described in embodiment 1, comprises the following steps:
Described float lever 2 floats on molten steel with float 1, its front end stretches out outside guiding mechanism 3, described light source 9 is radiated on described float lever 2 and makes float lever 2 more clear, camera lens 10 is imaged on the height of the float lever 2 that is exposed to guiding mechanism 3 tops on the photo-sensitive cell CCD of camera head 11, and the real image that camera head 11 becomes float lever 2 on photo-sensitive cell CCD is sent to data processor 13 in real time.
After this device is installed, carry out the calculating of the calibration coefficient C under condition of work now, measure the length L 0 that is now positioned at the extension outside described guiding mechanism 3, then described data processor 13 calculates the length L of the imaging of described extension by pixel computing method, then calibration coefficient C=L0/L now.
After the calibration coefficient calculating now, calculate the initial length of the extension of described float lever 2, described image collecting device carries out image acquisition to the extension of described float lever 2, obtain the imaging of the extension of described float lever 2, described data processor 13 obtains the length L 1 ' of described imaging according to pixel computing method, now the length of the extension of described float lever 2 is L1=C × L1 ';
In the time that the liquid level to be measured in described testing container 4 changes, described float 1 also fluctuates thereupon, and then the length variations of the extension of described float lever 2 also can change thereupon, image acquisition is carried out in the extension of the float lever 2 of described image collecting device after to described variation, obtain the imaging of the extension of described float lever 2, described data processor 13 obtains the length L 2 ' of described imaging according to pixel computing method, now the length of the extension of described float lever 2 is L2=C × L2 '; Now the length variations of the extension of described float lever 2 is: △ t=L2-L1, and the variation of the extension of described float lever 2 is consistent with the variation of described liquid level, and now liquid level changing value is △ t.Therefore this method is calculated liquid level variation by calculating calibration coefficient, liquid level can be multiplied by calibration coefficient by the pixels tall of float lever 2 correspondences that record and obtain, as long as float lever 2 positions, camera lens 10 positions do not change, calibration coefficient is just constant, can also demarcate at any time according to field requirement and actual conditions in addition, computing method are simply accurate, Figure 2 shows that in the amorphous alloy planar flow casting carrying device that this method measures molten steel liquid level height rule over time in steel ladle to be measured, as seen from the figure, this method has very fast time tracking to the measurement of molten steel liquid level height, the variation of molten steel liquid level height is in ± 15mm.
A kind of closed-loop control system is provided in the present embodiment, comprise testing container 4 and fluid infusion container, in described testing container 4, be provided with testing liquid 5, in described fluid infusion container, be provided with liquid make-up, in this enforcement, preferably steel ladle to be measured and fluid infusion steel ladle in described testing container 4 and the practical application of fluid infusion container, preferably molten steel of described liquid, described fluid infusion container is arranged on the top of testing container 4, the fluid infusion mouth of described fluid infusion container is controlled stopper rod 14 by stopper rod topworks 15 and is opened or close, and described fluid infusion mouth aligns with the draining hole 7 in described testing container 4, preferably funnel-form mechanism of described draining hole 7, on described testing liquid 5, be provided with above-mentioned dynamic liquid level height measuring device, described dynamic liquid level height measuring device comprises testing container 4, device for molten steel height is measured in the present embodiment, the float 1 being provided with on molten steel in steel ladle to be measured, described float 1 one end is arranged in molten steel, float on molten steel, along with liquid height changes and fluctuates, the other end connects float lever 2, described float lever 2 stretches out through guiding mechanism 3.Guiding mechanism 3 herein adopts refractory metal, it has through hole through testing container 4 walls and its centre, and through-hole wall is smooth, float lever 2 passes from this through hole, described float lever 2 can move along with moving of float 1 along described guiding mechanism 3, described float 1 adopts density to be less than the fire resistive material of molten steel density and hollow-core construction preferably, guarantee float 1 can be stable float on molten steel, float 1 preferably Tercod is fired and is formed, carbofrax material good heat resistance, little and the acid and alkali-resistance of expansion coefficient, it is extraordinary float 1 material, float 1 is hollow-core construction, described float 1 is of a size of external diameter 50mm, interior through 40mm, outer high 60mm, interior high 45mm, described float lever 2 adopts density to be less than fluid density, smooth surface and opaque tubular fire material, preferably alumina ceramic tube of float lever 2, float lever 2 is of a size of external diameter 10mm, interior through 6mm, described float 1 and described float lever 2 adopt high-temperature cement bonding, guarantee the stable connection between it.
Described dynamic liquid level height measuring device also comprises image collecting device and the data processor 13 being connected with this image collecting device, the preferred image processing analysis software adopting in industrial control computer of described data processor 13, adopt LabVIEW8.2 and Vision8.2 to work out, it is vertical with described float lever 2 that described image collecting device is preferably arranged on testing container 4 one sides, described image collecting device comprises camera lens 10 and camera head 11, due at vertical angle, the image of taking does not need to consider the problem of angle in the time calculating, if and 2 one-tenth 60 degree angles of camera lens 10 and float lever, during by image calculation float lever 2 length, also need angle calculation to enter, increase the complexity of calculating, so it is vertical with described float lever 2 preferably camera lens 10 to be arranged on to a side, the preferred f=48mm optical lens 10 that adopts of described camera lens 10, the preferred MVC800DAM-GE45 HD digital ccd video camera adopting with gigabit ethernet interface of camera head 11, on the camera lens 10 of described image collecting device, be preferably provided with light source 9, described light source 9 adopts source of parallel light in the present embodiment, can guarantee that this image collecting device is not affected by extraneous light etc., make float lever 2 have enough brightness, guarantee the accuracy gathering.
In the process of amorphous alloy Cast Strip, molten steel liquid level height in steel ladle to be measured is to affect amorphous alloy strips thickness in one of inhomogeneity key factor of length direction, so as obtained the continuous amorphous band of even thickness, just must the molten steel liquid level in steel ladle to be measured be measured accurately and be controlled, and closed-loop control system of the present invention has just realized this function, the image that float lever 2 height that native system utilizes camera head 11 Real-time Collections to swim in the float 1 in liquid change with liquid level, after processing in real time, data processor 13 obtains the dynamic height of float lever 2, and then realize the kinetic measurement of liquid level, PLC control system is connected with the data processor 13 of described dynamic liquid level height measuring device, obtain the variation of liquid level to be measured, in the present embodiment, PLC control system is selected Siemens PLC C, comprising: SIMATIC S7-300 PS307 power module, S7-300 CPU 313C-2DP, serial communication module CP340 and analog output module.The liquid level changing value that described PLC control system draws according to described data processor 13 draws controlled quentity controlled variable, and send to described stopper rod topworks 15, described stopper rod topworks 15 is according to stopper rod 14 described in controlled quentity controlled variable control, regulate the amount that flows into the molten steel the draining hole 7 of described drainage mechanism from described fluid infusion mouth, realize the closed-loop control to molten steel height in steel ladle to be measured.
A closed loop control method that adopts the closed-loop control system described in embodiment 3, comprises the following steps:
(1) float lever 2 that described image collecting device exposes guiding mechanism 3 tops carries out image acquisition, be radiated on described float lever 2 at described light source 9, described float lever 2 floats on testing liquid 5 with float 1, its front end stretches out outside guiding mechanism 3, camera lens 10 is imaged on the height of the float lever 2 that is exposed to guiding mechanism 3 tops on the photo-sensitive cell CCD of camera head 11, and the real image that camera head 11 becomes float lever 2 on photo-sensitive cell CCD is sent to data processor 13 in real time.
(2) after this device is installed, carry out the calculating of the calibration coefficient C under condition of work now, measurement is positioned at the length L 0 of the extension outside described guiding mechanism 3, then described data processor 13 calculates the length L of the imaging of described extension, calibration coefficient C=L0/L by pixel computing method;
(3) after the calibration coefficient calculating now, calculate the initial length of the extension of described float lever 2, described image collecting device carries out image acquisition to the extension of described float lever 2, obtain the imaging of the extension of described float lever 2, described data processor 13 obtains the length L 1 ' of described imaging according to pixel computing method, now the length of the extension of described float lever 2 is L1=C × L1 ';
(4) in the time that the liquid level to be measured in described testing container 4 changes, described float 1 also fluctuates thereupon, and then the length variations of the extension of described float lever 2 also can change thereupon, described image collecting device carries out image acquisition to the extension of the described float lever 2 changing, obtain the imaging of the extension of the described float lever 2 after changing, described data processor 13 obtains the length L 2 ' of described imaging according to pixel computing method, the length of the extension of the described float lever 2 after variation is L2=C × L2 '; Now the length variations of the extension of described float lever 2 is: △ t=L2-L1, the variation of the extension of described float lever 2 is consistent with the variation of described liquid level, now liquid level changing value is △ t, and described data processor 13 is by the liquid level changing value △ t obtaining and send to PLC control system.
(5) described PLC control system sends order to described stopper rod topworks 15 according to this liquid level changing value △ t, described stopper rod topworks 15 controls the aperture of described stopper rod 14 according to order, regulate the flow that flows into the liquid the draining hole 7 of described drainage mechanism from described fluid infusion mouth, if described changing value △ t is for negative, the liquid level that molten steel is namely described has declined, need to supplement molten steel, therefore described stopper rod topworks 15 opens control stopper rod 14, molten steel in fluid infusion steel ladle is flowed in steel ladle to be measured, supplement the molten steel amount flowing out in steel ladle to be measured, when supplementary molten steel amount more than flow out molten steel amount time, molten steel liquid level will rise, at this time △ t is for just, 15 of described stopper rod topworkies can control stopper rod 14 closures, reduce the molten steel amount that replenishes steel ladle to be measured, make its molten steel liquid level return setting value, therefore native system and method have realized the mobile equilibrium of molten steel liquid level in steel ladle to be measured by real-time monitoring and control.
Described closed-loop control system adopts this method to realize the closed-loop control to liquid level in testing container 4, Figure 3 shows that the concrete effect figure in amorphous alloy planar flow casting carrying device of closed-loop control system of the present invention and method, described testing container 4 is steel ladle to be measured, described fluid infusion container is fluid infusion steel ladle, fluid infusion steel ladle is supplemented molten steel to it, the molten steel liquid level height rule over time of nozzle bag in amorphous alloy planar flow casting carrying device according to the molten steel liquid level height in the steel ladle described to be measured of measuring.Molten steel liquid level height rule over time as seen from the figure, described closed-loop control system in the variation of closed-loop control situation molten steel liquid level height in ± 3mm, make in the be reduced to ± 1mm of variation of the thickness of strip forming from described steel ladle Jet with downward flow direction to be measured, make the thickness of strip that generates even, therefore the present invention has that equipment is simple, reliability strong, observing and controlling precision is high and low cost and other advantages.
Obviously, above-described embodiment is only for example is clearly described, and the not restriction to embodiment.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here without also giving exhaustive to all embodiments.And the apparent variation of being extended out thus or variation are still among the protection domain in the invention.
Claims (11)
1. a dynamic liquid level height measuring device, comprise the float on the testing liquid being arranged in testing container, described float one end is arranged in testing liquid, the other end connects float lever, described float lever stretches out through guiding mechanism, and described float lever can move along with moving of float along described guiding mechanism, it is characterized in that, also comprise image collecting device and the data processor being connected with this image collecting device, image acquisition is carried out in the extension that described image collecting device is positioned at outside described guiding mechanism described float lever, described data processor is positioned at the length of the extension outside described guiding mechanism according to float lever described in the image calculation gathering, thereby obtain the height of described liquid level to be measured.
2. dynamic liquid level height measuring device according to claim 1, it is characterized in that, described image collecting device is arranged on testing container one side, and described image collecting device comprises camera lens and camera head, and described lens direction is vertical with described float lever bearing of trend.
3. dynamic liquid level height measuring device according to claim 1 and 2, is characterized in that, on the camera lens of described image collecting device, is provided with light source.
4. according to the dynamic liquid level height measuring device described in claim 1-3 any one, it is characterized in that, described float adopts density to be less than the fire resistive material of described testing liquid density and is hollow-core construction, described float lever adopts density to be less than described testing liquid density, smooth surface and opaque tubular fire material, and described guiding mechanism adopts the smooth refractory metal of inside surface.
5. according to the dynamic liquid level height measuring device described in claim 1-4 any one, it is characterized in that, described float adopts Tercod to fire and forms, and described float lever adopts alumina ceramic material, and described float and described float lever adopt high-temperature cement bonding.
6. measurement computing method that adopt the dynamic liquid level height measuring device described in 1-5 any one, is characterized in that, comprise the following steps:
Described image collecting device carries out image acquisition to the extension of the float lever outside guiding mechanism, and the realtime graphic collecting is sent to data processor;
Calculate calibration coefficient C, measure described float lever and be positioned at the length L 0 of the extension outside described guiding mechanism, then described data processor calculates the length L of the imaging of described extension, calibration coefficient C=L0/L by pixel computing method;
Secondly, calculate the initial length of the extension of described float lever, described image collecting device carries out image acquisition to the extension of described float lever, obtain the imaging of the extension of described float lever, described data processor obtains the length L 1 ' of described imaging according to pixel computing method, now the length of the extension of described float lever is L1=C × L1 ';
When after the length variations of the extension of described float lever, described image collecting device carries out image acquisition to the extension of described float lever, obtain the imaging of the extension of described float lever, described data processor obtains the length L 2 ' of described imaging according to pixel computing method, now the length of the extension of described float lever is L2=C × L2 '; Now the length variations of the extension of described float lever is: △ t=L2-L1, and the length variations of the extension of described float lever is consistent with the variation of described liquid level, and now liquid level changing value is △ t.
7. measurement computing method according to claim 6, it is characterized in that, the step that described image collecting device gathers the extension of the float lever outside guiding mechanism is specially: under the irradiation of light source, camera lens is imaged on the height of the float lever that is exposed to guiding mechanism top on the photo-sensitive cell of camera head, and the real image that camera head becomes float lever on photo-sensitive cell is sent to data processor in real time.
8. a closed-loop control system, comprises testing container and fluid infusion container, in described testing container, is provided with testing liquid, in described fluid infusion container, is provided with liquid make-up,
It is characterized in that, the fluid infusion mouth of described fluid infusion container is opened or is closed by stopper rod actuating mechanism controls stopper rod, and described fluid infusion mouth aligns with the draining hole in described testing container, on described testing container, be provided with the dynamic liquid level height measuring device described in described claim 1-5 any one, PLC control system is connected with the data processor of described dynamic liquid level height measuring device, obtain liquid level changing value to be measured, and be converted into steering order and export to stopper rod topworks.
9. closed-loop control system according to claim 8, it is characterized in that, the liquid level numerical value that described PLC control system draws according to described data processor and setting value contrast draw controlled quentity controlled variable, and send to described stopper rod topworks, described stopper rod topworks is according to stopper rod described in controlled quentity controlled variable control, regulates the amount that flows into the liquid the draining hole of described drainage mechanism from described fluid infusion mouth.
10. a control method that adopts the closed-loop control system described in claim 8 or 9, is characterized in that, comprises the following steps:
The float lever that described image collecting device exposes guiding mechanism top carries out image acquisition, and the realtime graphic collecting is sent to data processor;
Calculate calibration coefficient C, measure the length L 0 that is positioned at the extension outside described guiding mechanism, then described data processor calculates the length L of the imaging of described extension, calibration coefficient C=L0/L by pixel computing method;
Calculate the initial length of the extension of described float lever, described image collecting device carries out image acquisition to the extension of described float lever, obtain the imaging of the extension of described float lever, described data processor obtains the length L 1 ' of described imaging according to pixel computing method, now the length of the extension of described float lever is L1=C × L1 ';
When after the length variations of the extension of described float lever, described image collecting device carries out image acquisition to the extension of described float lever, obtain the imaging of the extension of described float lever, described data processor obtains the length L 2 ' of described imaging according to pixel computing method, now the length of the extension of described float lever is L2=C × L2 '; Now the length variations of the extension of described float lever is: △ t=L2-L1, the variation of the extension of described float lever is consistent with the variation of described liquid level, now liquid level changing value is △ t, and described data processor is by the liquid level changing value △ t obtaining and send to PLC control system;
Described PLC control system sends order to described stopper rod topworks according to this liquid level changing value △ t, described stopper rod topworks controls the aperture of described stopper rod according to order, regulate the amount that flows into the liquid the draining hole of described drainage mechanism from described fluid infusion mouth.
The control method of 11. closed-loop control systems according to claim 10, it is characterized in that, described step (1) is specially: under the irradiation of light source, camera lens is imaged on the float lever that is exposed to guiding mechanism top on the photo-sensitive cell of camera head, and the real image that camera head becomes float lever on photo-sensitive cell is sent to data processor in real time.
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