CN110595419A - System and method for measuring thickness of liquid slag layer of casting powder - Google Patents
System and method for measuring thickness of liquid slag layer of casting powder Download PDFInfo
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- CN110595419A CN110595419A CN201910730823.2A CN201910730823A CN110595419A CN 110595419 A CN110595419 A CN 110595419A CN 201910730823 A CN201910730823 A CN 201910730823A CN 110595419 A CN110595419 A CN 110595419A
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- 239000002893 slag Substances 0.000 title claims abstract description 104
- 239000007788 liquid Substances 0.000 title claims abstract description 71
- 238000000034 method Methods 0.000 title claims abstract description 46
- 238000005266 casting Methods 0.000 title claims abstract description 30
- 239000000843 powder Substances 0.000 title abstract description 26
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 194
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 193
- 239000010959 steel Substances 0.000 claims abstract description 47
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 44
- 230000001681 protective effect Effects 0.000 claims abstract description 15
- 239000000523 sample Substances 0.000 claims abstract description 15
- 239000000725 suspension Substances 0.000 claims description 35
- 230000004907 flux Effects 0.000 claims description 27
- 238000003780 insertion Methods 0.000 claims description 23
- 230000037431 insertion Effects 0.000 claims description 23
- 238000009749 continuous casting Methods 0.000 claims description 14
- 238000005259 measurement Methods 0.000 claims description 14
- 230000008569 process Effects 0.000 claims description 12
- 230000004044 response Effects 0.000 claims description 6
- 238000003860 storage Methods 0.000 claims description 6
- 238000002425 crystallisation Methods 0.000 claims description 5
- 230000008025 crystallization Effects 0.000 claims description 5
- 238000009499 grossing Methods 0.000 claims description 3
- 238000005070 sampling Methods 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 230000008859 change Effects 0.000 abstract description 4
- 230000008878 coupling Effects 0.000 description 12
- 238000010168 coupling process Methods 0.000 description 12
- 238000005859 coupling reaction Methods 0.000 description 12
- 230000000670 limiting effect Effects 0.000 description 5
- 238000002844 melting Methods 0.000 description 5
- 238000005245 sintering Methods 0.000 description 5
- 238000000691 measurement method Methods 0.000 description 4
- 230000008018 melting Effects 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 239000013078 crystal Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
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- 238000004321 preservation Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 206010044565 Tremor Diseases 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 239000012295 chemical reaction liquid Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 239000011162 core material Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000010309 melting process Methods 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/02—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness
- G01B21/08—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness for measuring thickness
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
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- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
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- Food Science & Technology (AREA)
- Medicinal Chemistry (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
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- Continuous Casting (AREA)
Abstract
The invention provides a thickness measuring system and method of a liquid slag layer of casting powder, wherein the system comprises: the carbon concentration sensor is electrically connected with the control device and arranged at the movable end of the mobile device, the mobile device vertically inserts the carbon concentration sensor into the liquid level of the protective slag layer, a probe of the carbon concentration sensor penetrates through the protective slag layer and extends below the liquid level of the molten steel, and the carbon concentration sensor collects carbon concentration information of different positions in the protective slag layer and the molten steel in real time and transmits the information to the control device. The protective slag liquid slag layer measuring system is simple in structure and convenient to operate, greatly improves the automation degree and level of production, and reduces the difficulty of manual operation. And the thickness information of the liquid slag layer can be reflected through the change of the carbon concentration, the result is accurate, the error is small, and the method is suitable for large-scale application.
Description
Technical Field
The invention relates to the technical field of steel smelting processes, in particular to a thickness measuring system and method for a liquid slag layer of casting powder.
Background
It is known that the continuous casting mold powder, which is a key core material in the continuous casting process, has irreplaceable effects on the quality of a casting blank and the smooth running of the continuous casting process. The added protective slag plays roles of heat preservation, air isolation, molten steel secondary oxidation prevention and inclusion absorption in the continuous casting process, and is mainly capable of controlling lubrication and heat transfer between the billet shell and the crystallizer. The mold flux charged into the mold is heated by the temperature of the molten steel and then melted, and layered, generally considered as a three-layer structure, which is a powder layer-a sintered layer-a liquid slag layer from top to bottom, but the mold flux contains carbon (graphite or carbon black), and the carbon may be completely burned off before the mold flux is melted, and actually, a carbon-rich layer is formed due to the fact that oxygen in the air is difficult to permeate during the melting process of the mold flux, so that the carbon cannot be completely burned, and carbon in carbon nuclei formed during the slagging and sintering processes of the mold flux is continuously accumulated in the molten slag layer, and thus a powder layer-a sintered layer-a semi-molten layer-a carbon-rich layer-a liquid slag layer is formed, wherein the thickness and the carbon content of the carbon-rich layer are related to the carbonaceous material and the content in the mold flux. Under normal conditions, the thickness of the liquid slag layer is 8-15mm, and if the liquid slag layer is too thin, the slag film between the wall of the crystallizer and the solidified blank shell cannot meet the requirement, the occurrence of steel leakage bonding accidents is easily caused; if the liquid slag layer is too thick, slag rings are easily formed along the periphery of the crystallizer, the channel of meniscus liquid slag flowing into the blank shell and the wall of the crystallizer is blocked, a uniform slag film cannot be formed, cracks are easily generated, and the quality of a casting blank is deteriorated. The normal thickness of the sintered layer is 5-10mm, and too thin or too thick will affect the thickness of the liquid slag layer. The normal thickness of the slag layer is 5-10mm, and if the thickness is too thin, the effect of heat preservation cannot be achieved, and if the thickness is too thick, slag strips are easy to form. Therefore, it is very important to control a reasonable slag layer structure in the continuous casting process, particularly to continuously form a liquid slag layer having a certain thickness and stable performance and being uniformly melted.
In actual production, the thickness of the liquid slag layer of the crystallizer casting slag is used as one of the evaluation indexes of the service performance of the casting slag, and has important influence on the smooth running of continuous casting production and the quality of casting blanks. The thickness of the slag layer influences the uniform lubrication and heat transfer of the slag film, and further influences the surface defects of the casting blank. Therefore, in order to ensure stable continuous casting production and obtain good casting blank quality, it is necessary to develop an accurate and feasible device and method for measuring the thickness of the liquid slag layer of the casting slag.
At present, the method for measuring the thickness of the slag layer comprises a manual measuring method and an instrument measuring method. The manual measurement method is to insert steel wires, copper wires and aluminum wires with the same length into the molten steel of the casting slag in the crystallizer, keep the steel for 2 to 3 seconds and take out the steel wires, and the melting points of the metal wires are different, so the melting states are different, and the thickness of the slag layer is calculated according to the length difference of the metal wires. However, the manual measurement method not only increases the labor intensity of workers, but also causes inaccurate measurement and larger error due to shaking of hands, vibration of the crystallizer, fluctuation of the liquid level of molten steel and the like during detection, influences the correct judgment of the slag condition of the crystallizer by a steel pouring worker, causes steel leakage accidents, and influences the smooth production of steel pouring. The instrumental measurement method is classified into the following methods according to different principles. (1) Moving a thermocouple method: firstly, the melting point of steel, the melting temperature of the covering slag and the sintering temperature are measured, then a movable thermocouple is inserted into the covering slag and the molten steel in the crystallizer, the state of a substance is judged according to the temperature measured by the thermocouple at different positions, and the thickness of a liquid slag layer and the thickness of a sintering layer are further obtained. If the temperature of the molten steel has large fluctuation, the method can not judge the slag-metal interface, so that the measurement can not be carried out. And the thermocouple protective sleeve is easy to break to cause damage to the thermocouple, and the practicability is poor. (2) Electrode method: the method is characterized in that an electrode rod made of a conductive material which resists oxidation and steel slag corrosion at high temperature is inserted into a crystallizer, the electrode passes through covering slag and molten steel in sequence, the resistance value between electrodes is different at different positions, and the slag layer structure is measured according to the change of the resistance value between the electrodes. The method can quickly react with the structural change of the casting powder, but has the phenomena of steel sticking and slag sticking and is also influenced by electricity and noise. (3) An ultrasonic method: generating ultrasonic waves through a high-temperature resistant conducting rod inserted into the crystallizer, measuring the distance by using ultrasonic echo, and analyzing and determining the thickness of a slag layer according to a oscillogram. The method cannot measure the thickness of the liquid slag layer and cannot meet the requirements of the site. (4) An electromagnetic induction method: because the distance delta H between the eddy current thermal sensor and the lower surface of the sensor contact head is short, when the contact head reaches the surface of the mold flux, the sensor supporting plate stops moving downwards. The eddy current thermal sensor measures the distance H from the surface of the molten steel, and the thickness of the covering slag can be obtained according to the difference between the distance H and the surface of the molten steel. The method can only measure the total thickness of the casting powder, cannot measure the thickness of the liquid slag layer, and cannot meet the actual requirement. At present, in the domestic steel industry production, most of the methods adopt manual measurement methods, so that a new device and a method for measuring the thickness of the slag layer of the protective slag liquid of the continuous casting crystallizer are urgently needed to be developed.
Disclosure of Invention
The invention mainly aims to provide a system and a method for measuring the thickness of a liquid slag layer of protective slag, which aim to solve the technical problems of inaccurate thickness measurement and low efficiency of the liquid slag layer in the prior art.
In order to achieve the above object, a system for measuring a thickness of a molten slag layer of mold flux according to an embodiment of the present invention includes: the carbon concentration sensor is electrically connected with the control device, the carbon concentration sensor is arranged at the movable end of the mobile device, the mobile device is used for vertically inserting the carbon concentration sensor into the liquid level of the casting powder, a probe of the carbon concentration sensor penetrates through the casting powder layer and extends below the liquid level of the molten steel, and the carbon concentration sensor transmits carbon concentration information of different insertion depths to the control device. The thickness of the liquid slag layer is calculated by utilizing the different carbon contents of different layers in the casting powder, so that the operation is convenient and the accuracy is high.
Preferably, the moving device comprises a circular sleeve, a pull rod and a cross rod transversely extending from one side of the pull rod, the carbon concentration sensor is arranged on the cross rod, the pull rod is arranged in an inner cavity of the circular sleeve, a vertical strip-shaped groove is formed in the side wall of the circular sleeve, the cross rod extends out of the strip-shaped groove, the pull rod is lifted upwards to drive the cross rod to move up and down in the strip-shaped groove, and the carbon concentration sensor is driven to move up and down. The movement direction of the cross rod is controlled through the strip-shaped groove, the vertical crystal liquid level inserted into the carbon concentration sensor is guaranteed, the insertion depth and the corresponding carbon concentration are accurately measured, and the measuring accuracy is improved.
Preferably, the mobile device includes a support frame, a screw rod, a nut, a suspension rod and two positioning rods, the upper end of the screw rod vertically penetrates through the upper platform of the support frame, the nut is in threaded connection with the screw rod, one end of the suspension rod is fixedly connected with the outer side of the nut, the other end of the suspension rod is connected with the carbon concentration sensor, the two positioning rods are fixedly connected with the support frame, the two positioning rods are respectively arranged on two sides of the suspension rod to limit the movement of the suspension rod in the horizontal direction, the screw rod is rotated to enable the nut to move up and down, and the suspension rod is driven to lift up and down to enable the carbon sensor to vertically move up and down.
Preferably, the mobile device further comprises a driving motor, the driving motor is electrically connected with the control system, the driving motor is arranged on the supporting plate, a through hole is formed in the supporting plate, one end of the screw rod penetrates through the through hole and is connected with the driving motor, and the control system controls the driving motor to rotate so as to drive the screw rod to rotate. The screw rod is driven to rotate by the driving motor, so that the integration degree and the automation degree of the system are improved, the carbon concentration sensor is enabled to descend at a constant speed and to be vertically inserted, and the measuring accuracy is further improved.
Preferably, carbon concentration sensor pass through coupling assembling with the polished rod links to each other, coupling assembling includes coupling nut and lower coupling nut, the polished rod is kept away from the one end of screw rod is equipped with the connecting hole, carbon concentration sensor's upper end is equipped with the external screw thread, carbon concentration sensor's upper end is from supreme passing down in proper order coupling nut, connecting hole and last coupling nut down. The carbon concentration sensor is fixed at the end part of the suspension rod through the connecting assembly, so that the stability of the structure is improved, and the safety of the carbon concentration sensor in the measuring process is ensured.
Preferably, the control device includes: the device comprises a signal acquisition module, a signal storage module and a signal control module. The signal acquisition module is used for acquiring information measured by the carbon concentration sensor and insertion depth information, the signal storage module is used for storing the acquired information, and the signal control module is used for controlling the rotating speed and the rotating direction of the driving motor.
On the other hand, the invention also provides a method for measuring the thickness of the liquid slag layer of the casting powder, which uses the system for measuring the thickness of the liquid slag layer of the casting powder to measure the thickness of the liquid slag layer, and the method specifically comprises the following steps:
s1, aligning the carbon concentration sensor to the crystallization liquid level of the continuous casting crystallizer, and vertically inserting a probe of the carbon concentration sensor below the crystallization liquid level of the crystallizer through a moving device;
s2, recording the insertion depth of the carbon concentration sensor and the carbon concentrations corresponding to different depths in the descending process of the carbon concentration sensor, and transmitting the insertion depth of the carbon concentration sensor and the carbon concentrations corresponding to different depths to the control system;
s3, when the carbon concentration Q detected by the carbon concentration sensor probe1When the carbon concentration is equal to the carbon concentration in the molten steel, the carbon concentration Q is recorded1Corresponding depth X1And continuously descending for 1cm, and then lifting the carbon concentration sensor upwards out of the liquid level of the crystallizer;
s4, comparing the carbon concentration information recorded in the step S2 to obtain the maximum carbon concentrationValue QMAXCorresponding insertion depth X2Solving for X2And X1Obtaining the thickness of the liquid slag layer to be measured.
Preferably, in step S2, the response frequency of the carbon concentration sensor is 2 to 4 times/second, and the speed of insertion of the carbon concentration sensor is 0 to 10 mm/S. The high frequency response ensures that enough carbon concentration information is obtained, and the accuracy of measurement is ensured.
Preferably, in step S2, the emission frequency of the control system acquisition module is greater than the response frequency of the carbon concentration sensor.
Preferably, step 1 and step S4 specifically include the following steps:
s41, calling the insertion depth of the carbon concentration sensor and the carbon concentration information corresponding to different depths, which are stored in the control system, and drawing a two-dimensional curve by taking the insertion depth of the carbon concentration sensor as an abscissa and the carbon concentration corresponding to the insertion depth of the carbon concentration sensor as an ordinate;
s42, smoothing the two-dimensional curve;
s43, respectively finding out the abscissa X corresponding to the maximum carbon concentration according to the pre-measured carbon content in the molten steel1And an abscissa X corresponding to a carbon concentration value corresponding to the carbon content in molten steel appearing for the first time2；
S44, difference Δ X between them ═ X2-X1I.e. the thickness of the liquid slag layer.
The protective slag liquid slag layer measuring system is simple in structure and convenient to operate, greatly improves the automation degree and level of production, and reduces the difficulty of manual operation. And the thickness information of the reaction liquid slag layer is obtained through the change of the carbon concentration, so that the result is accurate, the error is small, and the method is suitable for large-scale application.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a thickness measurement system for a molten slag layer of mold flux in an embodiment of the invention;
FIG. 2 is a schematic view of the mold flux layering in the embodiment of the present invention;
FIG. 3 is a two-dimensional graph illustrating carbon concentration information and insertion depth according to an embodiment of the present invention;
FIG. 4 is a flowchart of a method for measuring the thickness of a molten slag layer of mold flux in an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a thickness measurement system for a slag layer of mold flux in another embodiment of the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are only for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "connected," "secured," and the like are to be construed broadly, and for example, "secured" may be a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In addition, the technical solutions in the embodiments of the present invention may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination of technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
The invention mainly aims to provide a protective slag liquid slag layer thickness measuring system to solve the technical problems of inaccurate liquid slag layer thickness measurement and low measurement efficiency in the prior art.
Example one
Referring to fig. 1, a system for measuring a thickness of a slag layer of a mold flux according to an embodiment of the present invention includes a control device 1, a moving device 2, and a carbon concentration sensor 11. The carbon concentration sensor 11 is used for measuring the contents of carbon simple substances in the casting powder and the molten steel. The carbon concentration sensor 11 is electrically connected to the control device 1, and transmits the collected carbon concentration information to the control device 1. One end of the moving device 2 is a movable end and can move up and down. The moving device 2 is electrically connected with the control device 1, and receives a control signal of the control device 1 to drive the movable end to move up and down. The carbon concentration sensor 11 is connected to the movable end of the moving device 2 and moves up and down in accordance therewith. The carbon concentration sensor 11 is aligned with the liquid level of the molten steel in the crystallizer, so that the carbon concentration sensor 11 can be inserted into the mold flux and the molten steel to measure the carbon concentration of the mold flux and the molten steel, the measured carbon concentration information is transmitted to the control device 11, and the control device 11 stores the information for the next calculation.
Specifically, mobile device 2 in this embodiment includes support frame 7, screw rod 5, nut 8, suspension rod 9 and gag lever post 13, and support frame 7 top is equipped with horizontally upper mounting plate 6, and upper mounting plate 6 upper surface level can provide stable platform on the one hand and place drive arrangement, and on the other hand can guarantee that screw rod 5 orientation is steady when rotating.
The upper platform 6 is provided with a through hole, and the screw 5 vertically penetrates through the through hole on the upper platform 6 and extends out of the upper part of the upper platform 6. The internal thread of the nut 8 is connected to the external thread of the screw 5, and the nut 8 moves up and down along the screw 5 when the screw 5 rotates. The suspension rod 2 is a transverse rod which is transversely arranged, and two limiting rods 13 are arranged on two sides of the suspension rod 2. The bottom end of the limiting rod 13 is fixedly connected with the bottom of the supporting frame 7. The suspension rods 2 are arranged in the gaps between the limit rods 13. The limiting rod 13 can limit the horizontal line-of-defence movement of the suspension rod 2 and does not limit the vertical movement of the suspension rod 2. The right end of the suspension rod 2 is fixedly connected with the outer side of the nut 8, and the nut 8 moves up and down under the driving of the suspension rod to enable the suspension rod 2 to move up and down due to the limiting effect of the limiting rod 13 when the screw rod 8 rotates. The left end of the suspension rod 2 is connected to a carbon concentration sensor 11. In conclusion, rotating the screw 2 moves the nut 8 up and down and drives the suspension rod 3 up and down to vertically move the carbon sensor 11 up and down.
Preferably, the moving device 2 in the embodiment of the present invention further includes a driving motor 4. The driving motor 4 is electrically connected with the control system 1, and the control system 1 sends a control signal to control the rotating speed and direction of the driving motor. The rotating speed of the driving motor 4 is continuously adjustable at 0-10mm/s, and the device has a positive and negative rotation mode. The driving motor 4 is arranged on the upper platform 6, and a threaded hole is formed in the bottom of the driving motor 4. The upper platform 6 is provided with a through hole, and the threaded hole of the driving motor 4 is aligned with the through hole of the upper platform 6. The upper end of the screw rod 5 passes through the through hole to be connected with the threaded hole of the driving motor 4 and the driving motor 4. The control system 1 controls the driving motor 4 to rotate so as to drive the screw rod 5 to rotate, and the control system 1 controls the translation speed and direction of the suspension rod 2 by controlling the rotation speed and direction of the screw rod 5 so as to control the movement direction and speed of the carbon concentration sensor at the left end of the suspension rod 2.
The carbon concentration sensor 11 is a rod-shaped structure, the probe 12 of the carbon concentration sensor 11 is arranged at one end of the carbon concentration sensor 11, and the outer wall of the other end of the carbon concentration sensor 11 is provided with an external thread. Carbon concentration sensor 11 in this embodiment links to each other with suspension rod 2 through coupling assembling, and coupling assembling includes coupling nut 3 and lower coupling nut 10, and suspension rod 2 keeps away from the left end and is equipped with the connecting hole, and carbon concentration sensor 11's upper end is from supreme passing down coupling nut 10, connecting hole and last coupling nut 3 in proper order down. During installation, the suspension rod 8 needs to be perpendicular to the horizontal plane, so that the suspension rod 2 and the carbon concentration sensor 11 can move in the vertical direction. When the carbon concentration sensor is installed, the carbon concentration sensor 11 is fixed through the connecting assembly, the probe 12 of the carbon concentration sensor 11 is ensured to be vertical to the horizontal plane and downwards, and the probe 12 is ensured to be vertically inserted into the protective slag liquid and the molten steel.
Further, the control device 2 in this embodiment includes a signal acquisition module, a signal storage module, and a signal control module. The signal acquisition module is used for acquiring a carbon concentration signal acquired by the carbon concentration sensor 11 and a position signal of the insertion depth. And the acquisition frequency of the signal acquisition module is required to be greater than the response frequency of the carbon concentration sensor 11, so that the signals of the carbon concentration sensor can be completely collected by the signal acquisition module, and the signals are not omitted. The signal storage module is used for storing the acquired signals. The signal control module is used for controlling the speed and the direction of the rotation of the driving motor 4.
The embodiment of the invention also provides a method for measuring the thickness of the liquid slag layer of the casting powder, which uses the system for measuring the thickness of the liquid slag layer of the casting powder for measurement, taking the measurement of the casting powder of the Q235 thin slab continuous casting crystallizer as an example, the specific operation steps are as follows:
and S1, aligning the carbon concentration sensor 11 with the crystallization liquid level of the continuous casting crystallizer, and adjusting the positions of the suspension rod 5 and the carbon concentration sensor 11 to be in the vertical direction vertical to the horizontal plane. The control system 1 starts the driving motor 4 to rotate, the driving nut 8 moves downwards to drive the suspension rod 9 to translate downwards, the carbon concentration sensor 11 at the end part of the suspension rod 9 moves downwards, and the inserting speed of the carbon concentration sensor 11 is controlled to be 1mm/s until the probe 12 is vertically inserted below the crystal liquid level of the crystallizer.
S2, in the descending process of the carbon concentration sensor 11, the signal acquisition module of the control system 1 transmits an acquisition signal, and the recorded signal includes: the depth of insertion of the carbon concentration sensor 11 and the concentration of the carbon simple substance corresponding to different depths; and transmits it to the control system 1 for storage.
S3, when the probe 12 of the carbon concentration sensor 11 detects the carbon concentration Q1When the carbon concentration is equal to the carbon concentration in the molten steel, the carbon concentration Q is recorded1Corresponding depth X1And continuously descends for 1cm, and then the rotation direction of the driving motor 4 is changed to lift the carbon concentration sensor 11 upwards out of the liquid level of the crystallizer.
S4, retrieving data stored in the control system 1, drawing a two-dimensional curve of carbon concentration information with the depth of insertion of the carbon concentration sensor 11 as the abscissa and the measured carbon concentration value 11 as the ordinate, smoothing the two-dimensional curve, and removing points with large deviations. Respectively finding out the abscissa X corresponding to the maximum carbon concentration according to the pre-measured carbon content in the molten steel1And an abscissa X corresponding to a carbon concentration value corresponding to the carbon content in molten steel appearing for the first time2. Calculating the difference between the two values2-X1Namely the thickness of the liquid slag layer to be measured.
As shown in fig. 2, it is difficult for air in the inner layer of the mold flux to enter so that carbon is not combusted, and carbon in the carbon nuclei formed during the course of the slag formation and sintering of the mold flux is continuously accumulated in the slag layer to finally form a carbon-rich layer. In the protective slag layer, a powder slag layer, a sintering layer, a semi-melting layer, a carbon-rich layer and a liquid slag layer are arranged from top to bottom in sequence. In the method in this embodiment, each layer is distinguished according to the difference in carbon content of each layer in the mold flux. When the position with the highest carbon content in the casting powder is measured to correspond to the carbon-rich layer, the carbon-rich layer is always thin, and the position with the highest carbon concentration in the casting powder can be judged as the upper interface of the liquid slag layer. And a liquid steel layer is arranged below the liquid slag layer, and when the carbon content is equal to that in the liquid steel through testing, the lower interface of the liquid slag layer is judged. The difference of the depths corresponding to the two interfaces is the thickness of the liquid slag layer to be measured.According to the result of this measurement, Delta X is equal to X2-X1＝10.4mm。
In the embodiment, the carbon concentration sensor probe is automatically, vertically and uniformly inserted into the casting powder to be measured by utilizing the principle that the carbon concentration of each layer of the casting powder is different and combining the control system and the driving motor, and the carbon concentration sensor is lifted after the measurement is completed so as to be convenient for reuse. The measuring process is not influenced by severe environment of a continuous casting field, and the device has the advantages of reliable principle, simple structure, convenient operation, accurate result and high measuring efficiency. Not only can alleviate workman's intensity of labour, can improve the accuracy that detects moreover.
Example two
In a new embodiment, a system for measuring a thickness of a layer of mold flux slag includes: a control device, a moving device and a carbon concentration sensor. The carbon concentration sensor is used for detecting the contents of carbon simple substances in the casting powder and the molten steel. The carbon concentration sensor is electrically connected with the control device and transmits the collected carbon concentration information to the control device. One end of the moving device is a movable end and can move up and down. The moving device is electrically connected with the control device and receives a control signal of the control device to drive the movable end to move up and down. The carbon concentration sensor is connected with the movable end of the moving device and moves up and down along with the movable end of the moving device. The carbon concentration sensor is aligned to the liquid level of the molten steel in the crystallizer, so that the carbon concentration sensor can be inserted into the mold powder and the molten steel and measures the carbon concentration of the mold powder and the molten steel, the measured carbon concentration information is transmitted to the control device, and the control device stores the information for the next calculation.
Specifically, the moving device in this embodiment includes a circular sleeve 21, a pull rod 22, and a cross bar 23 extending laterally from one side of the pull rod 22, the carbon concentration sensor 24 is provided on the cross bar 23, and the pull rod 22 extends into an inner cavity of the circular sleeve 21. The side wall of the circular sleeve 21 is provided with a vertical strip-shaped groove 25, and the cross rod 23 extends out of the strip-shaped groove 25. The bottom of the circular sleeve 21 is fixedly placed in a horizontal position, and the extending direction of the strip-shaped groove 25 is vertical to the horizontal plane. The upper end of the pull rod 22 is provided with a handrail 26, the pull rod 22 is pulled by the handrail 26 to drive the cross rod 23 to move up and down in the strip-shaped groove 25 and drive the carbon concentration sensor 24 to move up and down, so that the carbon concentration sensor 24 enters the liquid slag layer and is measured.
The liquid slag layer was then measured using the following procedure:
s1, moving the circular sleeve 21 and adjusting the base to be horizontal. The carbon concentration sensor 24 is aligned with the mold level of the continuous casting mold, and the pull-down rod 22 vertically inserts the probe of the carbon concentration sensor 24 below the mold level.
S2, recording the insertion depth of the carbon concentration sensor 24 and the carbon concentration corresponding to different depths in the descending process of the carbon concentration sensor 24, and transmitting the carbon concentration to a control system;
s3, when the carbon concentration Q detected by the probe of the carbon concentration sensor 241When the carbon concentration is equal to the carbon concentration in the molten steel, the carbon concentration Q is recorded1Corresponding depth X1And continuously descending for 1cm, and then pulling up the pull rod 22, thereby driving the cross rod 23 to lift up to lift the carbon concentration sensor 24 out of the liquid level of the crystallizer;
s4, comparing the carbon concentration information recorded in the step S2 to obtain the maximum value Q of the carbon concentrationMAXCorresponding insertion depth X2Solving for X2And X1Obtaining the thickness of the liquid slag layer to be measured.
The measuring system and the measuring method in the embodiment can also realize accurate and rapid measurement of the thickness of the liquid slag layer.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A thickness measurement system of a molten slag layer of mold flux, comprising: the carbon concentration sensor is electrically connected with the control device, the carbon concentration sensor is arranged at the movable end of the mobile device, the mobile device vertically inserts the carbon concentration sensor into the liquid level of the protective slag layer, the probe of the carbon concentration sensor penetrates through the protective slag layer and extends below the liquid level of the molten steel, and the carbon concentration sensor collects the carbon concentration information of different positions of the protective slag layer and the molten steel in real time and transmits the information to the control device.
2. The system for measuring the thickness of a slag layer of casting slag liquid according to claim 1, wherein the moving device comprises a circular sleeve, a pull rod and a cross rod transversely extending from one side of the pull rod, the carbon concentration sensor is arranged on the cross rod, the pull rod is arranged in an inner cavity of the circular sleeve, a vertical strip-shaped groove is formed in a side wall of the circular sleeve, the cross rod extends out of the strip-shaped groove, and the pull rod is pulled to drive the cross rod to move up and down in the strip-shaped groove and drive the carbon concentration sensor to move up and down.
3. The system for measuring the thickness of a slag layer of mold flux according to claim 1, wherein the moving device comprises a support frame, a screw, a nut, a suspension rod and two positioning rods, the upper end of the screw vertically penetrates through an upper platform of the support frame, the nut is in threaded connection with the screw, one end of the suspension rod is fixedly connected with the outer side of the nut, the other end of the suspension rod is connected with the carbon concentration sensor, the number of the two positioning rods is two, the lower end of the positioning rod is fixedly connected with the support frame, the two positioning rods are respectively arranged on two sides of the suspension rod to limit the horizontal movement of the suspension rod, the screw is rotated to vertically move the nut, and the suspension rod is driven to lift so as to vertically move the carbon sensor.
4. The system of claim 3, wherein the moving device further comprises a driving motor electrically connected to the control system, the driving motor is disposed on the supporting plate, the supporting plate is provided with a through hole, one end of the screw rod passes through the through hole and is connected to the driving motor, and the control system controls the driving motor to rotate to drive the screw rod to rotate.
5. The system for measuring the thickness of a slag layer of mold flux according to claim 3 or 4, wherein the carbon concentration sensor is connected to the suspension rod through a connection assembly, the connection assembly comprises an upper connection nut and a lower connection nut, a connection hole is formed in one end of the suspension rod, which is far away from the screw rod, an external thread is formed in the upper end of the carbon concentration sensor, and the upper end of the carbon concentration sensor sequentially penetrates through the lower connection nut, the connection hole and the upper connection nut from bottom to top.
6. The system of claim 5, wherein the control device comprises a signal acquisition module, a signal storage module, and a signal control module.
7. A method for measuring the thickness of a molten slag layer of mold flux, characterized in that the molten slag layer is measured using the system for measuring the thickness of a molten slag layer of mold flux according to any one of claims 1 to 6, comprising the steps of:
s1, aligning the carbon concentration sensor to the crystallization liquid level of the continuous casting crystallizer, and vertically inserting a probe of the carbon concentration sensor below the crystallization liquid level of the crystallizer through a moving device;
s2, recording the insertion depth of the carbon concentration sensor and the carbon concentrations corresponding to different depths in the descending process of the carbon concentration sensor, and transmitting the insertion depth of the carbon concentration sensor and the carbon concentrations corresponding to different depths to the control system;
s3, when the carbon concentration Q detected by the carbon concentration sensor probe1When the carbon concentration is equal to the carbon concentration in the molten steel, the carbon concentration Q is recorded1Corresponding depth X1And continuously descending for 1cm, and then lifting the carbon concentration sensor upwards out of the liquid level of the crystallizer;
s4, comparing the maximum value Q of the carbon concentration according to the carbon concentration information recorded in the step S2MAXCorresponding insertion depth X2Solving forX2And X1Obtaining the thickness of the liquid slag layer to be measured.
8. The measuring method of the slag layer thickness of the mold flux liquid as claimed in claim 7, wherein in step S2, the response frequency of the carbon concentration sensor is 2-4 times/sec, and the speed of insertion of the carbon concentration sensor is 0-10 mm/S.
9. The method of measuring a thickness of a slag layer of mold flux according to claim 8, wherein a sampling frequency of the control device is greater than a response frequency of the carbon concentration sensor.
10. The method for measuring the thickness of the slag layer of the mold flux liquid as claimed in claim 7, wherein the step S4 specifically comprises the steps of:
s41, calling the insertion depth of the carbon concentration sensor and the carbon concentration information corresponding to different depths, which are stored in the control system, and drawing a two-dimensional curve by taking the insertion depth of the carbon concentration sensor as an abscissa and the carbon concentration corresponding to the insertion depth of the carbon concentration sensor as an ordinate;
s42, smoothing the two-dimensional curve;
s43, respectively finding out the abscissa X corresponding to the maximum carbon concentration according to the pre-measured carbon content in the molten steel1And an abscissa X corresponding to a carbon concentration value corresponding to the carbon content in molten steel appearing for the first time2；
S44, difference Δ X between them ═ X2-X1I.e. the thickness of the liquid slag layer.
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