CN101709993A - Vibration signal acquisition device - Google Patents
Vibration signal acquisition device Download PDFInfo
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- CN101709993A CN101709993A CN200910210769A CN200910210769A CN101709993A CN 101709993 A CN101709993 A CN 101709993A CN 200910210769 A CN200910210769 A CN 200910210769A CN 200910210769 A CN200910210769 A CN 200910210769A CN 101709993 A CN101709993 A CN 101709993A
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Abstract
The invention discloses a vibration signal acquisition device, which is used for detecting the vibration caused by liquid steel flowing from a ladle to a tundish through the long nozzle protection tube to a long nozzle protection tube. The vibration signal acquisition device comprises a sensitization mechanism and a sensor, wherein the sensitization mechanism is fixed to the end or near the end of a mechanical arm and comprises a spring sheet for transferring and magnifying a vibration signal of the long nozzle protection tube; the sensor is used for detecting the vibration signal magnified by the spring sheet. In the vibration signal acquisition device, the sensitization mechanism is designed according to the original mechanical arm, and is fixed to the end of the mechanical arm by modes of welding and the like; and the sensor is arranged on the spring sheet of the sensitization mechanism. The assembly mode increases the energy of the detected signal greatly, improves signal to noise ratio, and can accurately extract the characteristic of roughing slag after the analytical processing of software and improve the alarm rate of the roughing slag.
Description
Technical field
The present invention relates to field of metallurgy, relate in particular to a kind of vibration signal acquisition device of bale slag-blanking.
Background technology
In the production run of continuous casting process, molten steel flows into tundish from big bag, enters crystallizer through the tundish water delivering orifice 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, increase tundish refractory corrosion and the remaining thickness of slag layer of increase tundish when middle cinder inclusion layer is blocked up.Therefore the slag amount in the big bag of control is to improving slab quality, increasing continuous casting very important meaning batch is arranged.
Existing multiple at present slag inspection method down is as infrared technique, electromagnetic induction, ladle weight method, ultrasound wave etc.Based on the slag detection system of infrared technique, its principle is a radiation characteristic of utilizing molten steel different with slag, makes to distinguish molten steel and slag by the density of radiation that discharges in many infrared wavelength ranges.This technology can guarantee to begin to realize accurate, slag detection reliably from tapping process, its shortcoming is that steel stream can not be blocked in detection, 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, detect so generally be not used in the following slag of big bag at present, be mainly used in the following slag detection of converter taphole to ladle.
Induction down slag detection system, its principle are to utilize that molten steel is different with the magnetic permeability of slag to be detected, and have how tame steelworks abroad and adopt this system, and obtain 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 average every month to coil, the sensor of used big bag bottom, so use cost is higher.
The ladle automatic testing method of weighing is feasible in theory, it is according to being: the general assembly (TW) of molten steel casting later stage ladle and molten steel is the rate substantially constant over time, because the proportion of slag has only 1/3 of molten steel, in case have slag to occur, the general assembly (TW) 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.
In addition, utilizing ultrasound wave to carry out under the molten steel that slag detects also is a kind of method commonly used.The principle of ultrasonic Detection Method is to utilize ultrasound wave when slag being arranged and do not have slag in the big bag beam to send difference between signal and the reflected signal to realize detection to slag.Though this method is to not influence of casting cycle and since the operating ambient temperature of ultrasonic probe up to 1500 degree about, working environment is more abominable, make and the expense used higher, also have segment distance of length from commercial Application.
The initial origin of practice of vibration monitoring method is in the molten steel casting scene.In casting process, the variation of the big bag long nozzle motion arm vibration that veteran operative employee can experience by casting latter stage and judge the slag amount that enters tundish by big bag prior to visual observation.A large amount of on-site 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 protective sleeve.
In fact; flow into the process of tundish from big bag at molten steel; protective casing and the motion arm that is attached thereto can produce stronger vibration; mouth of a river aperture is big more; molten steel flow is big more; vibration is strong with regard to Shaoxing opera, and slag proportion approximately is 1/3rd of molten steel, and is therefore inevitable variant by the vibration that slag flows and MOLTEN STEEL FLOW causes.Therefore, in theory by the vibration of monitoring motion arm should be able to the indirect monitoring protective casing in the situation of change of MOLTEN STEEL FLOW state.
But the vibration situation in the continuous casting process is a more complicated.The several main factors that influences the motion arm vibration has:
In casting process, require the molten steel amount of tundish basicly stable, liquid steel level can not be too high, can not be too low.The aperture that this just requires the operative employee will regulate steel ladle sliding water gap according to the molten steel amount in the tundish when the tundish liquid level is high, will be turned the aperture of slide gate nozzle down; And when the tundish liquid level reduces, aperture will be transferred big.This just makes the state of the steel stream in the protective casing change thereupon, and this variation also is reflected in the vibration of motion arm, and vibration increases along with the increase of slide gate nozzle aperture.
In the latter stage of big bag cast, can place another bag on the bale panoramic tables and smelt good molten steel, after last Baogang water poured, this Baogang's water will then be poured into a mould.And this amplifies the process of bag, just whole bale panoramic tables has been brought impact.This impacts the vibratory impulse that has also caused motion arm simultaneously.
In the bale slag-blanking testing process, the operative employee is very frequent to the action of slide plate, and each action all will influence the vibration of motion arm and keep a period of time, if slag under at a time when this, useful signal is with buried, and influence slag is down judged.
Certain decay in the middle of being fixed on the hired car, during the sensor of the vibration transfer that long nozzle steel stream causes to the operation arm, can take place in big, the Heavy Weight of execute-in-place arm rigidity.
Also have some ambient vibrations, artificially vibration and noise in the continuous casting workshop, people's walking vibration etc. on the vibration of the noise during as electric arc furnace smelting, continuous casting workshop steelframe, the middle bag platform, these vibrations or noise all can impact the extraction of useful signal.
Therefore, sensor is directly installed on traditional method for detecting vibration on the mechanical arm, makes to have comprised a large amount of information that have nothing to do with steel stream vibration performance in the signal of sensor acquisition, the signal to noise ratio (S/N ratio) of signal is very low, useful signal is buried in a large amount of garbage signals, and Oscillation Amplitude is very little.Such signal is carried out time-domain analysis, frequency-domain analysis, scramble domain analysis, statistical study, wavelet analysis etc., and judge through neural network, the wrong report rate of failing to report is very high, and traditional detection mode haves much room for improvement.
Summary of the invention
The present invention aims to provide a kind of vibration signal acquisition device, so that vibration signals is true and reliable.
For this reason, the invention provides a kind of vibration signal acquisition device, be used for detecting the vibration that flows to the long nozzle protective casing that molten steel caused of tundish by big bag by the long nozzle protective casing in metallurgical process, it comprises: enhanced sensitivity mechanism, be fixed to mechanical arm, comprise the shell fragment that transmits and amplify the vibration signal of long nozzle protective casing; Sensor is used to detect the vibration signal that amplifies via reed; Radome covers on the sensor, is used to protect sensor.
Preferably, above-mentioned enhanced sensitivity mechanism is the operation handwheel that shell fragment is installed.
Preferably, the two ends of shell fragment are welded on the spoke of two symmetries of operating handwheel, and the operation handwheel is welded on the end of motion arm.
In one embodiment, above-mentioned enhanced sensitivity mechanism comprises: interior armful of ring is used for fixing to motion arm; Outer shroud, at least one reed by ring shooting is connected with interior armful of ring, and wherein, sensor is fixedlyed connected with described reed or outer shroud.
Preferably, above-mentioned outer shroud is annular or polygon.
Preferably, above-mentioned interior embracing between ring and the outer shroud is evenly equipped with three reeds with 120 ° of angle annulars, and outer shroud is open loop situations.
In another embodiment, above-mentioned enhanced sensitivity mechanism comprises: interior ring, its bottom are provided with the ring of embracing that is used for fixing to motion arm, outer shroud, and at least one shell fragment by ring shooting is fixedly attached to interior ring, and wherein, sensor is fixedlyed connected with reed or outer shroud.
In another embodiment, above-mentioned enhanced sensitivity mechanism comprises: outer shroud is used for fixing to motion arm; In ring, at least one reed by ring shooting is connected with outer shroud, wherein, sensor is fixedlyed connected with reed or interior ring.
Preferably, above-mentioned radome has the interlayer of logical cold air.
In the present invention, enhanced sensitivity mechanism designs according to original mechanical arm, is fixed on the mechanical arm by modes such as welding and poles, and sensor is installed on the shell fragment of enhanced sensitivity mechanism, and uses radome that sensor is protected.This mounting means increases detected signal energy greatly, and signal to noise ratio (S/N ratio) improves, and can accurately extract down the slag feature after software analysis is handled, and improves slag alarm rate down.Its advantage is:
1, the present invention designs especially according to the curstomer`s site actual conditions, and installation and maintenance are simple, and the operative employee is easy to use, uses to have more advantage under the narrow and small bad working environments in space, meets very much steel mill's needs.
2, the present invention fixes an enhanced sensitivity mechanism at motion arm, welds a shell fragment in the enhanced sensitivity mechanism again, has played the effect of amplifying signal.The traditional detection mode directly is installed in sensor on the motion arm, detected vibration signal is very faint, even comprised a large amount of garbage signals, the present invention is installed in sensor on the vibration shell fragment, as long as detect faint vibration signal, shell fragment will produce violent vibration, thereby signal is played amplification, makes sensor acquisition to the stronger signal of amplitude.
3, the shape of enhanced sensitivity mechanism is not limit, adaptability is strong.
4, radome can effectively be isolated the temperatures involved of tundish, also is connected with pressurized air and cools off in radome, and the working temperature of sensor can be controlled in about tens degree, has guaranteed the serviceable life and the stable performance of sensor.
Except purpose described above, feature and advantage, the present invention also has other purpose, feature and advantage.Below with reference to figure, other purpose, feature and effect of the present invention is described in further detail.
Description of drawings
Constitute this instructions a part, be used for further understanding accompanying drawing of the present invention and show the preferred embodiments of the present invention, and be used for illustrating principle of the present invention with instructions.Among the figure:
Fig. 1 shows the synoptic diagram that is used to detect the vibration of long nozzle protective casing according to the vibration signal acquisition device of first embodiment of the invention;
Fig. 2 shows the enlarged diagram of vibration signal acquisition device shown in Figure 1;
Fig. 3 shows the A-A view of vibration signal acquisition device shown in Figure 2; And
Fig. 4 shows the synoptic diagram according to the vibration signal acquisition device of second embodiment of the invention.
Fig. 5 shows the synoptic diagram that is used to detect the vibration of long nozzle protective casing according to the vibration signal acquisition device of third embodiment of the invention;
Fig. 6 shows the schematic top plan view of vibration signal acquisition device shown in Figure 5;
Fig. 7 shows the front elevation of vibration signal acquisition device shown in Figure 5; And
Fig. 8 shows the A-A view of vibration signal acquisition device shown in Figure 5.
Embodiment
Below in conjunction with accompanying drawing embodiments of the invention are elaborated, but the multitude of different ways that the present invention can be defined by the claims and cover is implemented.
Fig. 1 shows the synoptic diagram that vibration signal acquisition device 170 according to first embodiment of the invention is used to detect the vibration of long nozzle protective casing 130.As shown in Figure 1, molten steel flows to tundish 190 by big bag 110 by long nozzle protective casing 130, and long nozzle protective casing 130 is provided with motion arm 150, is provided with vibration signal acquisition device 170 at the end of motion arm 150.Vibration signal acquisition device 170 of the present invention comprises the sensor that amplifies the enhanced sensitivity mechanism of vibration signal and be used to detect the vibration signal that has amplified of being used to that is installed on the motion arm end.
Fig. 2 and Fig. 3 show vibration signal acquisition device shown in Figure 1.As shown in Figures 2 and 3, vibration signal acquisition device 170 comprises: interior armful of ring 174, constitute by two semi-rings, and be used for being fastened to the end of motion arm 150 by screw; Outer shroud 172, three reeds 176 uniform by annular are connected with interior armful of ring 174; Sensor 180 is fixed on the shell fragment 176 by web joint 178, is used to receive the vibration signal of shell fragment; And radome 182, be used for sensor 180 is protected, and isolate external interference, for example temperatures involved of tundish.In the present embodiment, interior armful of ring, three shell fragments and outer shroud constitute enhanced sensitivity mechanism.
It is uniform that three reeds 176 are 120 ° of annulars, and outer shroud 172 is open loop situations, and two ends terminate in reed 176 respectively.Sensor 180 can be installed on in three reeds 176 one, also can be mounted on two or three in three reeds 176.
Interior armful of ring 174 also can be whole mechanism, directly is soldered to the end of motion arm, so can avoid installing the malfunctioning phenomenon of signal that absent-mindedness causes.
Be provided with interlayer 182a in the radome 182, this interlayer can lead to refrigerating gas, so that the sensor 180 in the radome 182 is cooled off.One end of this radome 182 is connected to outer shroud 172 by connecting portion 182b, and the other end is embraced ring 174 in being connected to by connecting portion 182c.Expect easily, can in the inner space that radome 182 forms, lead to refrigerating gas with replacement at interlayer by logical refrigerating gas.
In the present embodiment, outer shroud 172 is open loop situations, the large semicircle annular.In other embodiments, outer shroud 172 also can be rectangular or multiple shape such as annular.In addition, reed not only can be rectangular, also can be different shapes such as disc or semi-disc.
In other optional embodiment, outer shroud can be fixed to the end of motion arm, and interior armful of ring is vacant state, connect by the uniform shell fragment of annular between outer shroud and the interior ring, so, the plane that outer shroud forms then with the bearing of trend level of motion arm.
Fig. 4 shows the synoptic diagram according to the vibration signal acquisition device of second embodiment of the invention.As shown in Figure 4, vibration signal acquisition device 170 comprises operation handwheel 171 and the shell fragment 173 that is welded and fixed on the symmetrical spoke, and this shell fragment 173 is provided with sensor 175.In actual mechanical process, the vibration signal of motion arm 150 is convenient to the detection of sensor 175 after amplifying through the shell fragment on the operation handwheel 171.In the present embodiment, enhanced sensitivity mechanism comprises operation handwheel 171 and reed 173.
Fig. 5 to Fig. 8 shows the vibration signal acquisition device according to third embodiment of the invention.As shown in Figure 5; vibration signal acquisition device 170 flatly is fixed on the motion arm 150; this motion arm is used for playing the effect of transmitting 130 vibrations of long nozzle protective casing simultaneously at metallurgical process operation long nozzle protective casing 130 when molten steel flows to tundish 190 by big bag 110.
In conjunction with reference to Fig. 6 to Fig. 8, the present embodiment and the first embodiment difference are that the bottom of interior ring 174 is provided with embraces ring 184, and sensor 180 directly is fixed on the shell fragment 176, and certainly, sensor 180 also can be fixed on the outer shroud 172.
Those skilled in the art expect easily, and the instruction of the enhanced sensitivity mechanism of first, second, third embodiment according to the present invention can design that spring one end is fixed or two ends are fixing multiple enhanced sensitivity mechanism.
In the present invention, enhanced sensitivity mechanism designs according to original mechanical arm, is fixed on the end of mechanical arm by modes such as welding, and sensor is installed on the shell fragment of enhanced sensitivity mechanism.This mounting means increases detected signal energy greatly, and signal to noise ratio (S/N ratio) improves, and can accurately extract down the slag feature after software analysis is handled, and improves slag alarm rate down.Its advantage is:
1, the present invention designs especially according to the curstomer`s site actual conditions, and installation and maintenance are simple, and the operative employee is easy to use, uses to have more advantage under the narrow and small bad working environments in space, meets very much steel mill's needs.
2, the present invention welds a shell fragment again in enhanced sensitivity mechanism of end welding of motion arm in the enhanced sensitivity mechanism, has played the effect of amplifying signal.The traditional detection mode directly is installed in sensor on the motion arm, detected vibration signal is very faint, even comprised a large amount of garbage signals, the present invention is installed in sensor on the vibration shell fragment, as long as detect faint vibration signal, shell fragment will produce violent vibration, thereby signal is played amplification, makes sensor acquisition to the stronger signal of amplitude.
3, the shape of enhanced sensitivity mechanism is not limit, adaptability is strong.
4, radome can effectively be isolated the temperatures involved of tundish, also is connected with pressurized air and cools off in radome, and the working temperature of sensor can be controlled in about tens degree, has guaranteed the serviceable life and the stable performance of sensor.
Be the preferred embodiments of the present invention only below, be not limited to the present invention, for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. vibration signal acquisition device is used for detecting by big bag in metallurgical process and flows to the vibration of the long nozzle protective casing that molten steel caused of tundish by the long nozzle protective casing, it is characterized in that, comprising:
Enhanced sensitivity mechanism is fixed to mechanical arm, comprises the shell fragment that transmits and amplify the vibration signal of described long nozzle protective casing;
Sensor is used to detect the vibration signal that amplifies via described reed; And
Radome covers on the described sensor, is used to protect described sensor.
2. vibration signal acquisition device according to claim 1 is characterized in that, described enhanced sensitivity mechanism is the operation handwheel that described shell fragment is installed.
3. vibration signal acquisition device according to claim 2 is characterized in that, the two ends of described shell fragment are welded on the spoke of two symmetries of described operation handwheel, and described enhanced sensitivity mechanism is welded on the end of described motion arm.
4. vibration signal acquisition device according to claim 1 is characterized in that, described enhanced sensitivity mechanism comprises:
The interior ring of embracing is used for fixing to described motion arm;
Outer shroud, at least one described reed by ring shooting is connected with interior armful of ring,
Wherein, described sensor is fixedlyed connected with described reed or described outer shroud.
5. vibration signal acquisition device according to claim 4 is characterized in that described outer shroud is annular or polygon.
6. vibration signal acquisition device according to claim 5 is characterized in that, described interior embracing between ring and the outer shroud is evenly equipped with three reeds with 120 ° of angle annulars, and described outer shroud is open loop situations.
7. vibration signal acquisition device according to claim 1 is characterized in that,
Interior ring, its bottom are provided with the ring of embracing that is used for fixing to described motion arm,
Outer shroud is fixedly attached to described interior ring by at least one described shell fragment,
Wherein, described sensor is fixedlyed connected with described reed or described outer shroud.
8. vibration signal acquisition device according to claim 1 is characterized in that, described enhanced sensitivity mechanism comprises:
Outer shroud is used for fixing to described motion arm; And
In ring, at least one described reed by ring shooting is connected with described outer shroud,
Wherein, described sensor is fixedlyed connected with described reed or described interior ring.
9. vibration signal acquisition device according to claim 1 is characterized in that described radome has the interlayer of logical cold air.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102174993A (en) * | 2011-03-08 | 2011-09-07 | 重庆大学 | Adjustable pipeline vibration signal acquisition enhancement device |
| CN105067106A (en) * | 2015-07-09 | 2015-11-18 | 大连理工大学 | Vibration signal acquisition method for intershaft bearing |
| CN105136273A (en) * | 2015-05-20 | 2015-12-09 | 武汉理工大学 | Automatic pipeline vibration monitoring and control device based on feedback and fiber sensing |
| CN105181989A (en) * | 2015-09-28 | 2015-12-23 | 苏州市海神达机械科技有限公司 | Fault monitoring device used for starter |
| CN105817615A (en) * | 2016-04-08 | 2016-08-03 | 广东韶钢松山股份有限公司 | Submerged nozzle through crack detection device and detection method thereof |
| CN113436418A (en) * | 2021-06-25 | 2021-09-24 | 吉林建筑大学 | Gear pump vibration anomaly detection and alarm device |
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|---|---|---|---|---|
| CN1266448C (en) * | 2004-09-28 | 2006-07-26 | 长安大学 | Plane strain measurement sensor |
| CN101349677A (en) * | 2008-08-29 | 2009-01-21 | 湖南镭目科技有限公司 | Bale slag-blanking vibrating detection device |
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- 2009-11-09 CN CN2009102107695A patent/CN101709993B/en active Active
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102174993A (en) * | 2011-03-08 | 2011-09-07 | 重庆大学 | Adjustable pipeline vibration signal acquisition enhancement device |
| CN102174993B (en) * | 2011-03-08 | 2013-04-03 | 重庆大学 | Adjustable pipeline vibration signal acquisition enhancement device |
| CN105136273A (en) * | 2015-05-20 | 2015-12-09 | 武汉理工大学 | Automatic pipeline vibration monitoring and control device based on feedback and fiber sensing |
| CN105136273B (en) * | 2015-05-20 | 2018-06-08 | 武汉理工大学 | Pipeline vibration based on feedback and Fibre Optical Sensor monitors automatically and control device |
| CN105067106A (en) * | 2015-07-09 | 2015-11-18 | 大连理工大学 | Vibration signal acquisition method for intershaft bearing |
| CN105067106B (en) * | 2015-07-09 | 2018-07-24 | 大连理工大学 | A kind of intershaft bearing vibration signals collecting method |
| CN105181989A (en) * | 2015-09-28 | 2015-12-23 | 苏州市海神达机械科技有限公司 | Fault monitoring device used for starter |
| CN105817615A (en) * | 2016-04-08 | 2016-08-03 | 广东韶钢松山股份有限公司 | Submerged nozzle through crack detection device and detection method thereof |
| CN113436418A (en) * | 2021-06-25 | 2021-09-24 | 吉林建筑大学 | Gear pump vibration anomaly detection and alarm device |
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