CN102935496A - Device and method for measuring temperature of surface of portable continuous casting slab - Google Patents
Device and method for measuring temperature of surface of portable continuous casting slab Download PDFInfo
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- CN102935496A CN102935496A CN2012104112280A CN201210411228A CN102935496A CN 102935496 A CN102935496 A CN 102935496A CN 2012104112280 A CN2012104112280 A CN 2012104112280A CN 201210411228 A CN201210411228 A CN 201210411228A CN 102935496 A CN102935496 A CN 102935496A
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Abstract
The invention discloses a device and method for measuring the temperature of the surface of a portable continuous casting slab. A temperature measurer is fixed on a circular electric dial driven by an electric motor, a measuring head is located in the circle center position of the electric dial, the electric dial is fixed at the front end of a mounting bracket, the electric dial and the mounting bracket are both fixed above the continuous casting slab, and a computer is connected with the electric dial and the temperature measurer to be used for completing the rotating speed setting of the dial and the temperature data acquisition of the temperature measurer. A measurement point and a measurement end point in the vertical direction are accurately positioned by using a laser range finder, simultaneously, data such as measuring data, a drawing speed, the rotating angle of a rotating disk, and the like is transmitted to the computer so as to calculate the distance between a measurement beginning point and the measurement end point and the rotating angle velocity of the rotating disk, and the temperature measurer continuously transmits temperature data signals for carrying out tracking temperature measurement on the casting slab to the computer; the computer processes the temperature data transmitted by the temperature measurer; and finally, a temperature variation data table and a variation curve are generated, thereby providing key parameters for the secondary cooling control of continuous casting.
Description
Technical field
The invention belongs to instrument field, concrete a kind of portable continuous casting billet surface temperature measurement device and temp measuring method.
Background technology
At present continuous casting forefront technology (liquid Reduction Technology, electromagnetic agitating technology etc.) all needs to instruct accurately the liquid core position of strand, operates to determine to depress with electromagnetic agitation where.The position of how to confirm liquid core of continuous casting billet, generally adopt at present on-the-spot shoot-pin test to test the solidification end of a certain steel grade, when the change of operating mode and casting steel grade, the corresponding change will occur in the liquid core position of continuous casting billet, can not be presented at dynamically the liquid core position under the different operating modes; And adopt solidification theory seldom in actual production, to obtain application in conjunction with the larger difference of the resulting result of the method for numerical computations and produced on-site physical presence.Because casting blank surface temperature has directly reflected Temperature Distribution and the liquid core position of strand inside, therefore, casting blank surface temperature becomes the key parameter of continuous casting secondary cooling control, and the solidification process information of strand inside needs to obtain by surface temperature, and this has more increased and obtains the accurately importance of this key parameter of casting blank surface temperature.
The water supply intensity of each section of secondary cooling zone has determined the behavior of solidifying of cooling effect and strand.Intensity of cooling increases, and can accelerate solidifying of strand, but the crack sensitivity of intensity of cooling and steel is closely related, and is subject to the constraint of slab quality, so must adopts rational secondary cooling system to obtain suitable intensity of cooling.The secondary cooling on the main manifestations that affects of slab quality is: (1) inhomogeneous cooling is even, will cause base shell temperature recovery too fast too high, and strand easily cracks; (2) intensity of cooling is excessive, and surface temperature is excessively low when making the strand aligning, easily produces surface transverse cracks, and intensity of cooling is crossed senior general and made flourishing transcrystalline or the bridging phenomenon of easily forming of column crystal simultaneously, makes center porosity and segregation aggravation; (3) intensity of cooling is inadequate, and the strand levelling with liquid core easily produces the aligning crackle; (4) two cold-zone casting blank surface temperatures are too high, and strand easily produces bulge deformation and center segregation is increased the weight of.
The temperature levels of casting billet surface and distribution situation are one of important technical parameters of casting process in the casting process, it has determined that directly growth rate and the strand final set of solidifying of molten steel in the casting process and cooling velocity, base shell put to get the position, and the quality of strand had vital impact.The on-line testing of casting blank surface temperature can directly obtain casting blank surface temperature value and temperature distributing rule, is that the casting process casting blank surface temperature is studied a requisite link, therefore carries out the casting blank surface temperature testing research and has important practical significance.
Continuous casting billet is in the extreme temperatures of two cold-zones, casting billet surface can form moisture film, iron scale in the process of cooling, on casting billet surface, also can fill the air steam, obtain dynamically, continuously, accurately the casting blank surface temperature not a duck soup of exemplary position, be difficult to hold the accurate location of thermometric.
In addition, want by a key point in two cold-zones is got the strand temperature as the understanding of system, the method of surveying by point bit by bit thermometric also is not all right, because strand all the time its temperature is everywhere all changing, the temperature that records a strand point in two cold-zones according to point is difficult to make the casting parameters that the language strand adapts.Therefore; in the process of test; need to accurately locate measuring point; and follow the tracks of the measuring point that not protected slag, iron scale cover; just can know strand in the variations in temperature of motion process by the Measurement accuracy of any like this, thereby change Temperature Distribution and the liquid core position of recognizing strand inside by casting blank surface temperature.
Summary of the invention
The purpose of this invention is to provide a kind of to the continuous casting billet that goes out straightening section carry out continuously, mancarried device and the method for Accurate Determining casting blank surface temperature, the variation of Obtaining Accurate continuous casting billet skin temperature, thereby for continuous casting secondary cooling control provides key parameter, it is applicable in the continuous steel-casting production process process, to the measurement of continuous casting billet skin temperature, significant to the quality that improves continuous casting billet.
Device of the present invention is by the temperature measurer (infrared temperature-measuring gun/thermal infrared imager) with laser ranging function, electronic dial, mounting bracket and data acquisition computer form, wherein temperature measurer (infrared temperature-measuring gun/thermal infrared imager) is fixed on the circular electronic dial by electrical motor driven, the temperature measurer camera is positioned at the home position of electronic dial, electronic dial is fixed on the mounting bracket front end, they are fixed in the continuous casting billet top together, computer links to each other with electronic dial and temperature measurer, is used for finishing dial speed setting and temperature measurer temperature data acquisition.
Between the temperature measuring head of temperature measurer and the strand point for measuring temperature apart from 0.5-20 rice.
The concrete steps of temp measuring method of the present invention are as follows:
ⅰ utilizes mounting bracket, and the electronic dial that temperature measurer is installed is fixed in strand orbit top;
ⅱ utilizes laser range finder to come the measurement terminal point of measurement point and vertical direction is accurately located, simultaneously the transfer of data such as measurement data, pulling rate, the rotating disc anglec of rotation are calculated distance and the rotating disc angular velocity of rotation of measuring between initial point and the terminal point to Computer, described trigonometric function relational expression is as follows:
H in the formula
1Vertical range between-temperature measurer and the measurement terminal point;
Distance between L-temperature measurer and the measurement initial point;
h
2Distance between-measurement initial point and the terminal point;
T-operation L used time of distance;
The angle of θ-L direction and vertical direction;
The pulling rate of-continuous casting billet;
V
The angleThe angular speed of-rotating disc rotation;
The thermometric response time of ⅲ temperature measurer be 300 milliseconds-2 seconds, temperature measurer is passed to computer continuously to the temperature data signal of strand tracking and temperature testing.
Computer is handled as follows the temperature data that described temperature measurer transmission comes;
The a computer take out in 30 seconds-3 minutes intervals temperature measurer adopt several temperature datas;
Several temperature datas that b gets temperature measurer compare, and take out wherein maximum temperature data;
C will draw the temperature data of described maximum as the initial temperature of initial point for measuring temperature, when treating that temperature data occurs again, measuring point is carried out tracking measurement, until measure terminal point;
D continuously passes to the temperature data of measuring in the computer simultaneously, finally generates variations in temperature tables of data and change curve.
The mode that the signal output part of described temperature measurer is connected with the communication interface of described computer can be serial or parallel.
Have a system comprehensively to react for continuous casting billet skin temperature is changed, described temperature measurer also can carry out thermometric in the certain distance in transversely interval of the straightening section strand of conticaster.
The mechanism of temp measuring method Accurate Determining strand vertical table surface temperature provided by the invention is such: in actual casting process, casting billet surface is usually by moisture film, the covering such as steam fog and iron scale, at this moment to its surface temperature measurement, probably side to be to be affixed on moisture film on the casting billet surface or the temperature of iron scale, but not the temperature of real casting billet surface, but above-mentioned moisture film or steam fog or iron scale are not successive to the covering of strand, strand in target initial point process in the regular hour section of temperature measurer is not fully covered, therefore, in the described time interval, when certain when the not covered part in surface appears in the thermometric initial point of temperature measurer in a flash, temperature measurer is namely followed the tracks of initial point, and the real surface temperature data acquisition of handle is in computer in Fixed Time Interval.Here it is reaches the purpose of obtaining the initial position temperature among the present invention, thereby the strand longitudinal temperature distributes after obtaining strand and go out straightening section by the continuous temperature measurement to this point.Again because owing to all should being lower than the not temperature of covered casting billet surface by the temperature of the casting billet surface of moisture film, steam fog or iron scale covering, so the true temperature of casting billet surface is the maximum temperature value that records in described time interval section certainly.
In a period of time spacer, choose strand measure in the temperature data of initial position maximum as strand measuring initial temperature, and the continuous casting dynamic secondary cooling model prediction that utilizes conticaster itself to be equipped with goes out different steel grades initial temperature range at point for measuring temperature place under different technology conditions.When this initial temperature value falls into the predicted temperature scope, just think that this temperature is the real surface temperature of initial position, otherwise continue to measure.
By above-mentioned temperature-measurement principle as can be known, obtain the real temperature of casting billet surface, it is very crucial setting the suitable time interval, and by the covering situation of moisture film or steam fog or iron scale, the general proper time interval can be at 30 seconds-3 minutes according to strand.If time interval section is too small, just may not have not covered casting billet surface through the thermometric target initial point of described temperature measurer, if but the time interval long, temperature measuring efficiency will reduce, and be unfavorable in time adjusting casting parameters by measurement result.
In addition, other factors that affect accurate thermometric also have:
The response time of temp measuring system, the response time of temp measuring system is that temperature measurer records a temperature and it is transferred to the time used in the computer again, and its size has a great impact accurate thermometric.Generally need to ask the response time of temp measuring system about 500 milliseconds.
The thermometric distance is the temperature measuring head of thermal infrared imager or infrared temperature-measuring gun and the distance between the strand point for measuring temperature.It generally can be between 0.5-20 rice.
The size of the initial target point of temperature measurer, because not covered on the strand go out may be less, if too little may being difficult to of target initial point captures, the accuracy of the temperature that records has also just reduced.The diameter of the target initial point of temperature measurer should be greater than 50 millimeters.
In addition, the temperature-measuring range of institute's use infrared radiation thermometer or temperature-measuring gun is in 400-2000 ℃, and its worst error is good less than 2%.
Advantage of the present invention and effect are, it does not need multiple devices to work simultaneously, therefore equipment is simple, low price, and easy for installation, can overcome on-the-spot complicated working condition, operating point tracking and temperature testing method is shown a second vertical thermometric to the continuous casting billet that goes out straightening section, and can be by the dial speed setting be carried out the transverse temperature collection to casting billet surface, its characteristics are can be continuously, the Accurate Determining casting blank surface temperature, the change procedure of Obtaining Accurate continuous casting billet skin temperature, thus for cooling off control, the continuous casting secondary provides key parameter.
Description of drawings
Vertical top of Fig. 1 continuous casting billet arranges the structural representation that temperature measurer and temperature measurer are connected with computer;
Fig. 2 is that the horizontal top of conticaster arranges the structural representation that temperature measurer and temperature measurer are connected with computer;
Fig. 3 the present invention is to the curve example of the vertical thermometric of strand;
Fig. 4 the present invention is to the curve example of the horizontal thermometric of strand.
The specific embodiment
Below in conjunction with accompanying drawing specific embodiments of the invention are elaborated.
As shown in Figure 1, by the temperature measurer 1(infrared temperature-measuring gun/thermal infrared imager with laser ranging function), electronic dial 3, mounting bracket 2 and data acquisition computer 4 form, wherein temperature measurer (infrared temperature-measuring gun or thermal infrared imager) is fixed on the circular electronic dial 3 by electrical motor driven, and the temperature measurer camera is positioned at the home position of electronic dial, electronic dial 3 is fixed on mounting bracket 2 front ends, they are fixed in continuous casting billet 5 tops together, computer 4 links to each other with electronic dial 3 and temperature measurer 1, is used for finishing the functions such as dial speed setting and temperature measurer temperature data acquisition.
The concrete steps of temp measuring method of the present invention are as follows:
ⅰ utilizes mounting bracket, and the electronic dial 3 that temperature measurer 1 is installed is fixed in strand 5 orbits top;
ⅱ utilizes the temperature measurer with laser ranging function to come the measurement terminal point of measurement point and vertical direction is accurately located, simultaneously the transfer of data such as measurement data, pulling rate, the rotating disc anglec of rotation are calculated distance and the rotating disc angular velocity of rotation of measuring between initial point and the terminal point to Computer, described trigonometric function relational expression is as follows:
H in the formula
1Vertical range between-temperature measurer and the measurement terminal point;
Distance between L-temperature measurer and the measurement initial point;
Distance between-measurement initial point and the terminal point;
T-operation L used time of distance;
The angle of θ-L direction and vertical direction;
V
DrawThe pulling rate of-continuous casting billet;
V
The angleThe angular speed of-rotating disc rotation;
The thermometric response time of ⅲ temperature measurer be 300 milliseconds-2 seconds, temperature measurer is passed to computer continuously to the temperature data signal of strand tracking and temperature testing.
As shown in Figure 2, have a system comprehensively to react for continuous casting billet skin temperature is changed, described temperature measurer also can carry out thermometric in the certain distance in transversely interval of the straightening section strand of conticaster, and its temperature-measurement principle is identical with vertical thermometric.
The temperature data that temperature measurer gathers all is transferred to described computer, and described computer carries out processing as described below to the temperature data that each temperature measurer gathers respectively;
The a computer take out in 30 seconds-3 minutes intervals temperature measurer adopt several temperature datas;
Several temperature datas that b gets temperature measurer compare, and take out wherein maximum temperature data;
C will draw the temperature data of described maximum as the initial temperature of initial point for measuring temperature, when treating that temperature data occurs again, measuring point is carried out tracking measurement, until measure terminal point;
D continuously passes to the temperature data of measuring in the computer simultaneously, finally generates variations in temperature tables of data and change curve.
The mode that the signal output part of described temperature measurer is connected with the communication interface of described computer can be serial or parallel.
Examine the filter casting billet surface usually by moisture film, the covering such as steam fog and iron scale, it is actual that what record that temperature probably measures is to be affixed on moisture film on the casting billet surface or the temperature of iron scale, but not the temperature of real casting billet surface, but above-mentioned moisture film or steam fog or iron scale are not successive to the covering of strand, strand in target initial point process in the regular hour section of temperature measurer is not fully covered, therefore, in the described time interval, when certain when the not covered part in surface appears in the thermometric initial point of temperature measurer in a flash, temperature measurer is namely followed the tracks of initial point, the real surface temperature data acquisition of handle is in computer in Fixed Time Interval, so, obtain the real temperature of casting billet surface, it is very crucial setting the suitable time interval, by the covering situation of moisture film or steam fog or iron scale, the general proper time interval can be at 30 seconds-3 minutes according to strand.If time interval section is too small, just may not have not covered casting billet surface through the thermometric target initial point of described temperature measurer, if but the time interval long, temperature measuring efficiency will reduce, and be unfavorable in time adjusting casting parameters by measurement result.
In addition, other factors that affect accurate thermometric also have:
The response time of temp measuring system, the response time of temp measuring system is that temperature measurer records a temperature and it is transferred to the time used in the computer again, and its size has a great impact accurate thermometric.Generally need the response time of this temp measuring system about 500 milliseconds.
The thermometric distance is the temperature measuring head of thermal infrared imager or infrared temperature-measuring gun and the distance between the strand point for measuring temperature.It generally can be between 0.5-20 rice.
The size of the initial target point of temperature measurer, because not covered on the strand go out may be less, if too little may being difficult to of target initial point captures, the accuracy of the temperature that records has also just reduced.The diameter of the target initial point of temperature measurer should be greater than 50 millimeters.
In addition, the temperature-measuring range of institute's use infrared radiation thermometer or temperature-measuring gun is in 400-2000 ℃, and its worst error is good less than 2%.
Laterally thermometric is by being fixed in the temperature measurer 1 of continuous casting billet one side, according to certain angular speed rotation, and continuous measurement, and the transmission temperature data obtains continuous casting billet skin temperature cross direction profiles figure in computer.
Embodiment 1: adopt said method and device to section be the little square billet of 120mm * 120mm as the thermometric object, six tanks in respectively being watered time go out secondary cooling zone casting billet surface longitudinal bight and medium temperature is measured, measurement result as shown in Figure 3.
Embodiment 2: adopting said method and device is the continuous casting billet of 1250mm * 300mm to section, measures going out straightening section casting billet surface transverse temperature, and measurement result as shown in Figure 4.
Can find out by Fig. 3, Fig. 4, adopt the present invention respectively strand vertically to be reached the lateral surfaces temperature and measure, the temperature curve that gets can reflect the variation of casting billet surface reality.
Claims (7)
1. portable continuous casting billet surface temperature measurement device, it is characterized in that, it is by forming with the temperature measurer of laser ranging function, electronic dial, mounting bracket and data acquisition computer, wherein temperature measurer is fixed on the circular electronic dial by electrical motor driven, and gage outfit is positioned at the home position of electronic dial, electronic dial is fixed on the mounting bracket front end, and they are fixed in the continuous casting billet top together, and computer links to each other with electronic dial and temperature measurer.
2. a kind of portable continuous casting billet surface temperature measurement device according to claim 1 is characterized in that, described temperature measurer with laser ranging function is infrared temperature-measuring gun or thermal infrared imager.
3. a kind of portable continuous casting billet surface temperature measurement device according to claim 1 is characterized in that, between the temperature measuring head of described temperature measurer and the strand point for measuring temperature apart from 0.5-20 rice.
4. a kind of portable continuous casting billet surface temperature measurement device according to claim 1 is characterized in that, described temperature measurer is arranged in the vertical or horizontal top of the straightening section strand of conticaster.
One kind adopt claim 1 ~ 4 described in each the temp measuring method of a kind of portable continuous casting billet surface temperature measurement device, it is characterized in that, the concrete steps of temp measuring method are as follows:
ⅰ utilizes mounting bracket, and the electronic dial that temperature measurer is installed is fixed in strand orbit top;
ⅱ utilizes laser range finder to come the measurement terminal point of measurement point and vertical direction is accurately located, simultaneously the transfer of data such as measurement data, pulling rate, the rotating disc anglec of rotation are calculated distance and the rotating disc angular velocity of rotation of measuring between initial point and the terminal point to Computer, described trigonometric function relational expression is as follows:
H in the formula
1Vertical range between-temperature measurer and the measurement terminal point;
Distance between L-temperature measurer and the measurement initial point;
h
2Distance between-measurement initial point and the terminal point;
T-operation L used time of distance;
The angle of θ-L direction and vertical direction;
V
DrawThe pulling rate of-continuous casting billet;
V
The angleThe angular speed of-rotating disc rotation;
The thermometric response time of ⅲ temperature measurer be 300 milliseconds-2 seconds, temperature measurer is passed to computer continuously to the temperature data signal of strand tracking and temperature testing;
Computer is handled as follows the temperature data that described temperature measurer transmission comes;
The a computer take out in 30 seconds ~ 3 minutes intervals temperature measurer adopt several temperature datas;
Several temperature datas that b gets temperature measurer compare, and take out wherein maximum temperature data;
C will draw the temperature data of described maximum as the initial temperature of initial point for measuring temperature, when treating that temperature data occurs again, measuring point is carried out tracking measurement, until measure terminal point;
D continuously passes to the temperature data of measuring in the computer simultaneously, finally generates variations in temperature tables of data and change curve.
6. the temp measuring method of a kind of portable continuous casting billet surface temperature measurement device according to claim 5 is characterized in that, the mode that the signal output part of described temperature measurer is connected with the communication interface of described computer is serial or parallel.
7. the temp measuring method of a kind of portable continuous casting billet surface temperature measurement device according to claim 5 is characterized in that, the time interval that temperature measurer is namely followed the tracks of initial point is 30 seconds-3 minutes.
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| CN104697813A (en) * | 2015-03-23 | 2015-06-10 | 中冶南方工程技术有限公司 | Fully-automatic molten steel temperature measurement and sampling device |
| CN105241551A (en) * | 2015-08-26 | 2016-01-13 | 广州特种承压设备检测研究院 | Temperature detection method of thermofusion welding machine |
| CN106644089A (en) * | 2016-12-26 | 2017-05-10 | 辽宁石油化工大学 | Casting blank surface temperature field measurement sensor and casting blank surface temperature field measurement method |
| CN106768431A (en) * | 2016-12-08 | 2017-05-31 | 攀钢集团攀枝花钢钒有限公司 | Continuous casting billet charging temperature detection method |
| CN107303601A (en) * | 2016-04-20 | 2017-10-31 | 宝山钢铁股份有限公司 | The cooling monitoring system and method for strand |
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| CN109813433A (en) * | 2018-12-01 | 2019-05-28 | 湖北理工学院 | The continuous temperature measurement method of LF refining furnace liquid steel temperature |
| CN109883563A (en) * | 2019-03-27 | 2019-06-14 | 辽宁科技大学 | A kind of continuous casting billet surface temperature measurement on-line device and method |
| CN110617903A (en) * | 2018-06-19 | 2019-12-27 | 宝山钢铁股份有限公司 | Method for detecting surface temperature of slab of hot rolling heating furnace |
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| CN104697813A (en) * | 2015-03-23 | 2015-06-10 | 中冶南方工程技术有限公司 | Fully-automatic molten steel temperature measurement and sampling device |
| CN105241551A (en) * | 2015-08-26 | 2016-01-13 | 广州特种承压设备检测研究院 | Temperature detection method of thermofusion welding machine |
| CN107303601A (en) * | 2016-04-20 | 2017-10-31 | 宝山钢铁股份有限公司 | The cooling monitoring system and method for strand |
| CN106768431A (en) * | 2016-12-08 | 2017-05-31 | 攀钢集团攀枝花钢钒有限公司 | Continuous casting billet charging temperature detection method |
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| CN106644089A (en) * | 2016-12-26 | 2017-05-10 | 辽宁石油化工大学 | Casting blank surface temperature field measurement sensor and casting blank surface temperature field measurement method |
| CN108732576B (en) * | 2017-04-18 | 2020-12-25 | 上海诺司纬光电仪器有限公司 | Method for positioning by means of a laser measuring device and laser measuring device |
| CN108732576A (en) * | 2017-04-18 | 2018-11-02 | 上海诺司纬光电仪器有限公司 | The method and laser measuring device for measuring positioned by means of laser measuring device for measuring |
| CN110617903A (en) * | 2018-06-19 | 2019-12-27 | 宝山钢铁股份有限公司 | Method for detecting surface temperature of slab of hot rolling heating furnace |
| CN110617903B (en) * | 2018-06-19 | 2021-08-17 | 宝山钢铁股份有限公司 | Method for detecting surface temperature of slab of hot rolling heating furnace |
| CN108870998A (en) * | 2018-08-21 | 2018-11-23 | 北京中石伟业科技股份有限公司 | A kind of sintering furnace is automatically to warm system and method |
| CN109813433A (en) * | 2018-12-01 | 2019-05-28 | 湖北理工学院 | The continuous temperature measurement method of LF refining furnace liquid steel temperature |
| TWI681831B (en) * | 2019-02-01 | 2020-01-11 | 中國鋼鐵股份有限公司 | Temperature monitoring system and method for monitoring temperature |
| CN109883563A (en) * | 2019-03-27 | 2019-06-14 | 辽宁科技大学 | A kind of continuous casting billet surface temperature measurement on-line device and method |
| CN109883563B (en) * | 2019-03-27 | 2024-03-15 | 辽宁科技大学 | Online temperature measuring device and method for surface of continuous casting billet |
| CN114054709A (en) * | 2021-11-17 | 2022-02-18 | 成都星云智联科技有限公司 | Method, equipment and storage medium for identifying and tracking casting blank |
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