CN201799590U

CN201799590U - Outflow slag detection system at ladle in continuous casting

Info

Publication number: CN201799590U
Application number: CN201020286794XU
Authority: CN
Inventors: 田陆; 李娟�
Original assignee: Individual
Current assignee: Individual
Priority date: 2010-08-10
Filing date: 2010-08-10
Publication date: 2011-04-20
Anticipated expiration: 2020-08-10

Abstract

The utility model provides an outflow slag detection system for realizing the detection method, which comprises a signal acquisition unit, a signal processing device and a control output device. A dual sensor is adopted for respectively collecting an acceleration vibration signal and a displacement deflection signal at an elongated nozzle, the characteristic parameters are extracted from the collected signals, and the judgment on outflow slag can be carried out from various aspects, so that the problems of erroneous judgment and missing judgment which are caused by the reason that the outflow slag is judged merely according to the vibration amplitude are avoided, and the accuracy of outflow slag carry detection of the system is enhanced.

Description

Continuous casting ladle roughing slag detection system

Technical field

The utility model relates to the continuous casting field, relates in particular to a kind of continuous casting ladle roughing slag detection system.

Background technology

In continuous casting production process, molten steel flows into tundish from big bag, enters crystallizer through the tundish delivery port again, and the cooling after coagulation becomes the strand in various cross sections.Slag blanket has the anti-oxidation effect of insulation to big bag and tundish molten steel, yet can cause molten steel to pollute when middle cinder inclusion layer is blocked up, increases the tundish refractory corrosion and increases the remaining thickness of slag layer of tundish.Therefore, the slag amount in the big bag of control is to improving slab quality, increasing continuous casting very important meaning batch is arranged.

At present, the existing multiple detection method that is used to detect the bale slag-blanking amount, as vibration detection, infrared technique, electromagnetic induction, ladle weigh, ultrasonic wave etc.

Based on the slag detection system of infrared technique, its radiation density of utilizing molten steel and slag to discharge in infrared wavelength range is distinguished molten steel and slag.Because steel stream can not be blocked in detecting, if be used for wrapping greatly the following slag detection of tundish, then must remove long nozzle, and will cause the secondary oxidation of molten steel like this, the following slag that generally is not used at present big bag detects, and is mainly used in the following slag detection of converter taphole to ladle.

Induction slag detection system down, it utilizes, and molten steel is different with the magnetic conductivity of slag to be detected, and external existing how tame steel mill adopts this system, and obtains metallurgical effect and economic benefit preferably.But, imbed coil, improvement expenses costliness in big bag bottom because this type systematic will be transformed big bag; And because working environment is higher, coil is easy to damage, and will change the maintenance cost height average every month to coil, the sensor of used big bag bottom.

Ladle is weighed automatic testing method according to the gross weight of molten steel casting later stage ladle and molten steel rate substantially constant over time, because the proportion of slag has only 1/3 of molten steel, in case have slag to occur, the gross weight in unit interval rate over time will obviously reduce.This method is owing to be subjected to the restriction of physical conditions such as weighing precision, and detection accuracy is very low, at present only as a kind of auxiliary detection means.

The ultrasonic Detection Method utilization is wrapped ultrasonic wave when slag being arranged in the beam and not having slag greatly and is sent difference between signal and the reflected signal and realize detection to slag.Because about the operating ambient temperature of ultrasonic probe was spent up to 1500, working environment was more abominable, does not also enter the practical stage at present.

The initial origin of practice of method for detecting vibration is in the molten steel casting scene.In casting process, veteran operative employee can roughly judge the slag amount that is entered tundish by big bag according to the variation of casting big bag long nozzle motion arm vibration in latter stage.A large amount of field experiences has proved that also dregginess is closely related in the molten steel that flows in the vibration of big package operation arm and the long nozzle.The vibration detection ratio juris is: the proportion of slag and molten steel differs bigger, and its flowability is also different, at eddy current flow during through ladle long nozzle, both have bigger difference to the souring of long nozzle, the vibration characteristics that therefore can cause ladle long nozzle changes, detect molten steel flow state in the long nozzle by the difference of vibration characteristics on time domain or frequency domain that detects ladle long nozzle, thus the indirect detection bale slag-blanking.When adopting the vibration detection method, sensor can be directly installed on motion arm or other vibration sensing location point of clamping long nozzle, and the installation of sensor is simple, and vibration signal obtains easily, small investment, and maintenance cost is low.

In the existing vibration detecting system that the following slag of ladle is detected, usually adopt single sensor to gather the vibration signal at long nozzle place, the size of the vibration amplitude by analyzing long nozzle is judged the following slag situation of ladle, but, because in the continuous casting process, the vibration situation more complicated of long nozzle only relies on the vibration amplitude size to judge that down slag causes erroneous judgement easily and fails to judge, thus cause that slag detects under the system inaccurate.

The utility model content

Technical problem to be solved in the utility model provides a kind of high continuous casting ladle roughing slag detection system of slag detection accuracy down.

In order to solve the problems of the technologies described above, the utility model provides a kind of continuous casting ladle roughing slag detection system, comprise: signal pickup assembly comprises acceleration transducer and displacement transducer, on acceleration transducer and displacement transducer all is arranged at long nozzle links to each other the motion arm; Signal processing apparatus, comprise signal conditioner, data acquisition card and industrial computer, acceleration transducer and displacement transducer are connected to the input of signal conditioner, and the output of signal conditioner is connected to the input of data acquisition card, and the output of data acquisition card is connected to industrial computer; The control output device comprises alarm unit, and alarm unit is connected to industrial computer.

Further, acceleration transducer and displacement transducer include three signalling channels, are used for gathering simultaneously the vibration signal of horizontal X, horizontal Y and vertical Z direction.

Further, signal processing apparatus also comprises signal input and output control card, and the input and output control card links to each other with industrial computer with control box, is used to gather digital quantity signal, and exports described digital quantity signal to industrial computer.

Further, digital quantity signal comprises following a kind of at least: put in place signal and subcontract signal of slide plate actuating signal, Zhong Bao.

Further, the control output device also comprises the slide plate control module that is used to control the slide plate action, and the slide plate control module links to each other with industrial computer.

Further, the control output device also comprises display unit, and display unit links to each other with industrial computer.

The utlity model has following beneficial effect:

1. adopt dual sensor to gather the acceleration vibration signal and the displacement beat signal at long nozzle place respectively, can obtain the vibration information at long nozzle place so more effectively, more all sidedly, can comprehensively judge following scoriform attitude from many aspects, thereby avoided having improved the accuracy that slag detects under the system because of only relying on the erroneous judgement that slag brings under the judgement of vibration amplitude size and failing to judge.

2. used sensor has a plurality of passages, can detect the vibration information of a plurality of directions, has improved the accuracy that slag detects under the system.

3. the utility model is on following slag Feature Recognition, also combines the slide plate actuating signal and subcontracts cast-in-site information such as signal, improved the accuracy that slag detects under the system.

Description of drawings

Accompanying drawing described herein is used to provide further understanding of the present utility model, constitutes the application's a part, and illustrative examples of the present utility model and explanation thereof are used to explain the utility model, do not constitute improper qualification of the present utility model.In the accompanying drawings:

Fig. 1 shows the following slag detection system structural representation of the utility model preferred embodiment; And

Fig. 2 shows the following slag testing process figure of the utility model preferred embodiment.

The specific embodiment

Below with reference to the accompanying drawings and in conjunction with the embodiments, describe the utility model in detail.

Fig. 1 shows the structural representation according to ladle roughing slag detection system of the present utility model.As shown in Figure 1, this ladle roughing slag detection system mainly comprises signal pickup assembly 200, signal processing apparatus 300 and control output device 400.Wherein, signal pickup assembly 200 comprises acceleration transducer 202 and displacement transducer 204; Signal processing apparatus 300 comprises signal conditioner 302, data acquisition card 304, signal input and output control card 306 and industrial computer 308; Control output device 400 comprises alarm unit 402, slide plate control module 404 and display unit 406.In addition, the ladle roughing slag detection system also comprises auxiliary devices such as junction box 500, switch enclosure (not shown).

Acceleration transducer 202 is connected with signal conditioner 302, data acquisition card 304 and industrial computer 308 by holding wire successively with displacement transducer 204.

Signal input and output control card 306 in the signal processing apparatus 300 is connected with the control box 600 of cast, be used for obtaining digital quantity signal from control box 600, as: slide plate actuating signal, Zhong Bao put in place signal, subcontract signal etc., and water signal and ladle weight signal and distinguish cast early stage, mid-term and latter stage in conjunction with opening.Wherein, opening and watering signal and ladle weight signal is that PLC (Programmable Logic Controller, programmable logic controller (PLC)) by steel mill provides, and gathers and send into industrial computer 308 by data acquisition card 304.Scoriform attitude under the above-mentioned cast-in-site parameter of introducing can be judged more exactly in detection system, the detection accuracy of raising system.

Alarm unit 402 can be selected any acoustic-optic alarm for use, receives alarm signal from industrial computer 308, starts sound and light alarm.When industrial computer 308 will descend the slag signal to export slide plate control module 404 to, slide plate control module 404 can be closed slide plate automatically.Display unit 406 can be selected the common display device for use, and industrial computer 308 can will descend slag information to export display unit 406 to, and 406 operating personnel can monitor down the scoriform condition in real time by display unit.

In casting process, molten steel flows into tundish 103 from big bag 101 through long nozzle 102, long nozzle 102 inserts in the tundish 103, steel mill's motion arm 104 links to each other with long nozzle 102, be used to support the fixed length mouth of a river 102, dual sensor 202 and 204 are installed on the motion arm 104, and wherein sensor 202 is a vibration acceleration sensor, and sensor 204 is a displacement transducer.When molten steel when long nozzle 102 flows into tundish 103, can cause the vibration of long nozzle 102, this vibration can conduct to sensor 202 and 204 by motion arm 104.The proportion of invar slag is lighter than molten steel, and the viscosity of slag is bigger, when molten steel is flowed through long nozzle 102, molten steel is strong to the impact shock of long nozzle 102, and the beat that causes long nozzle 102 is bigger, and when slag enters long nozzle 102, impact shock a little less than, and the beat that causes long nozzle 102 is less, so this system adopts dual sensor to detect.Sensor 202 is used for gathering the vibration acceleration information at long nozzle 102 places, and sensor 204 is used for gathering the displacement beat signal at long nozzle 102 places.Sensor 202 and sensor 204 all have three passages, can carry out multi-direction detection in horizontal x direction, horizontal y direction and vertical z direction.

When system detect by data acquisition card 304 open water signal after, system detects according to the received ladle information input of weighing, gather the vibration acceleration signal and the displacement beat signal at long nozzle 102 places by sensor 202 and sensor 204, and both are input to signal conditioner 302, carry out the amplification of signal behind data acquisition card 304 equipment such as grade, filtering, preprocessing process such as sampling and A/D conversion, enter industrial computer 308 after finishing and carry out real-time online analysis and processing, after algorithm is judged identification, two states to molten steel and slag is monitored, in case detect down slag, system sends the sound and light alarm signal, automatically or operator's manual-lock slide plate, finish whole testing process.

Fig. 2 shows the following slag testing process figure of the utility model preferred embodiment, and as shown in Figure 2, whole testing process may further comprise the steps:

S202, acceleration transducer and displacement transducer gather vibration acceleration signal and the displacement beat signal that is conducted to motion arm by long nozzle respectively.

S204 amplifies respectively, generates sampled signal after filtering, sampling and the A/D conversion process vibration acceleration signal and the described displacement beat signal of being gathered.

S206, the sampled signal input industrial computer with being generated carries out acceleration signature vector and displacement characteristic vector that wavelet packet analysis obtains sampled signal.Certainly, in the present embodiment, can also adopt other analytical method to the sampled signal of being imported, for example, vibration signal energy spectrometer and vibrational waveform comparative analysis.

S208, with the characteristic vector of scoriform attitude under the acceleration signature vector that obtained and displacement characteristic vector and the sign that prestores relatively, when the acceleration signature vector that is obtained and displacement characteristic vector all conform to the characteristic vector of scoriform attitude under the sign that prestores, execution in step S210; Otherwise repeated execution of steps S206 promptly continues the sampled signal of new input is carried out feature identification.

S210 sends the sound and light alarm signal and closes slide plate automatically.

The above is a preferred embodiment of the present utility model only, is not limited to the utility model, and for a person skilled in the art, the utility model can have various changes and variation.All within spirit of the present utility model and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within the protection domain of the present utility model.

Claims

1. a continuous casting ladle roughing slag detection system is characterized in that, comprising:

Signal pickup assembly (200) comprises acceleration transducer (202) and displacement transducer (204), and described acceleration transducer (202) all is arranged on the motion arm (104) that links to each other with long nozzle (102) with displacement transducer (204);

Signal processing apparatus (300), comprise signal conditioner (302), data acquisition card (304) and industrial computer (308), described acceleration transducer (202) and displacement transducer (204) are connected to the input of described signal conditioner (302), the output of described signal conditioner (302) is connected to the input of described data acquisition card (304), and the output of described data acquisition card (304) is connected to described industrial computer (308);

Control output device (400) comprises alarm unit (402), and described alarm unit (402) is connected to described industrial computer (308).

2. slag detection system down according to claim 1 is characterized in that described acceleration transducer (202) and displacement transducer (204) include three signalling channels, is used for gathering simultaneously the vibration signal of horizontal X, horizontal Y and vertical Z direction.

3. slag detection system down according to claim 1, it is characterized in that, described signal processing apparatus (300) also comprises: signal input and output control card (306), described signal input and output control card (306) is connected to control box (600), be used to gather digital quantity signal, and export described digital quantity signal to industrial computer (308).

4. slag detection system down according to claim 1 is characterized in that described control output device (400) also comprises the slide plate control module (404) that is used to control the slide plate action, and described slide plate control module (404) links to each other with described industrial computer (308).

5. slag detection system down according to claim 1 is characterized in that described control output device (400) also comprises display unit (406), and described display unit (406) links to each other with described industrial computer (308).