Title of Invention | A DEVICE FOR DETECTING THE PRESENCE OF HOT STOCKS IN ROLLING MILLS OF STEEL AND METAL INDUSTRY |
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Abstract | This invention relates to a device for detecting presence of hot stocks in for example, rolling mills in steel and metal industry, said device comprising: light capturing optics provided in a housing for capturing radiation from said hot stocks; an optical fibre conduit for carrying said radiation from hot stocks to a remote place; and an electronic circuitry arranged in said remote place for detecting presence of hot stocks from a high or low radiation signal received. |
Full Text | FIELD OF APPLICATION The present invention relates to a device for detecting the presence of hot stocks in rolling mills of steel and metal industry. The detection electronics can be kept at a remote location from the hot metal. Radiation from the hot stock can be carried to the detection electronics light capturing optics at a remote location by optical fibre conduit. The device of the present invention comprises light capturing optics, an optical fibre conduit for carrying radiation from a hot stock to a far off place where the detection electronics is provided, and detection electronics. Thus the present invention provides a device for detecting presence of hot stocks in for example, rolling mills in steel and metal industry, said device comprising: light capturing optics provided in a housing for capturing radiation from said hot stocks; an optical fibre conduit for carrying said radiation from hot stocks to a remote place; and an electronic circuitry arranged in said remote place for detecting presence of hot stocks from or low radiation signal received. BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS The present invention will now be described with the help of the accompanying drawings where Figure 1 shows light capturing optics of the present invention. Figure 2 shows the sensor holder for connecting the optical fibre conduit to a silicon photodiode. Figure 3 shows a housing for the light capturing optics of Figure 1. Figure 4 shows the design of the ferrule for optical fibre bundle end. Figure 5 shows the detection electronics of the device. DETAILED DESCRIPTION The light capturing optics is shown in Figure 1 and Figure 3 shows the housing for the light capturing optics of Figure 1. Light capturing optics 1 consists of a biconvex lens 2 along with optical fibre conduit 3 at the other end as shown in Figure 1. The specification of the lens 2 shown in Figure 1 can be of 23 mm diameter and 14 mm focal length. It can be different depending on the application if specified by the user. The capturing optics 1 focuses the light signal on the optical fibre conduit 3 which actually carries it to the electronic signal detector. In this way the electronic circuitry is shielded from the high temperatures of the hot stocks. The optical fibre conduit 3 consists of a bundle of multimode optical fibre strands (50 or more in number), 10 to 20 m long each depending on the length of optical fibre conduit, enclosed in a spiral, flexible, mild steel hollow wire with plastic sheath. The coating of the optical fibre strands is not removed which makes it resistant against easy breakage. The fibre bundling of multimode optical fibres of the present invention uses a spiral, flexible, mild steel hollow wire with plastic sheath which is an economical enclosure for optical fibre strands (50 or more in number). The method consists of pulling out a copper wire inserted inside the spiral hollow wire enclosure and attached to the bundle of optical fibre strands at one end. As the copper wire is pulled out, the optical fibre strands are pulled inside the spiral hollow wire casing. The ends of the optical fibre strands are then inserted inside ferrules (Figure 4) and glued together using a heat resistant and waterproof standard epoxy. The inclined ends are then polished flat using 5 µm polishing papers. The optical fibre conduit 3 is connected to a silicon photodiode through a sensor holder as shown in Figure 2 (sensor holder). The optical fibre conduit consists of specially designed ferrules at both ends. The design of the ferrule is shown in Figure 4. The dimension of the ferrule can be decided on the basis of the size of fibre conduit and the number of fibre strands in the fibre conduit. This method facilitates fabrication of the fibre bundles with the fibre strands as close as possible at the extremities. Along the length of the conduit, the optical fibres are splayed out which makes the arrangement flexible and liable to breakage. The differentiator provides an edge detection (i.e. a pulse of 23ms duration) whenever a change in the captured radiation has occurred between 1V/ms and 50V/ms. The differentiator is designed using the quad opamp IC like an LM 324. The output of the differentiator is fed to a timer like an LM 555 in a monostable configuration to generate a pulse. The edge detection output can be accessed via a relay or an open collector configuration. A yellow LED gives an indication of the output. The LED bar graph driver connected to a LED bar graph which displays the analog level. The analog level corresponding to the intensity of captured radiation is also available. The various outputs provided by the hot metal detector are level detection i.e. a high or a low signal depending on the presence or absence of hot metal, edge detection i.e. a pulse of 23ms duration whenever a change in the captured radiation has occurred between 1V/ms and 50V/ms and LED bar graph which displays the analog level. The analog output corresponding to the intensity of radiation captured is also available. There is a 17pin connector (CN2 in Figure 5) from which all outputs as mentioned above can be accessed. The spectral response of the device is 350-1050nm. Its response time is 7µs for analog output and 100µs for level detection and edge detection outputs. WE CLAIM; 1. A device for detecting presence of hot stocks in plants like rolling mills of steel and metal industry, characterized in that said device comprises : - light capturing optics (1) provided in a housing for capturing radiation from said hot stocks; - an optical fibre conduit (3) for carrying said captured radiation from hot stocks to a remote place; and - an electronic circuitry (Fig.5) provided in said remote place for detecting presence of hot stocks from a high or low radiation signal received. 2. The device as claimed in claim 1, wherein said electronic circuitry is provided with a comparator for detecting if the radiation signal received is high or low, using a quad opamp IC. 3. The device as claimed in claim 1, wherein said electronic circuitry is provided with a differentiator for providing edge detection output wherever a change in the capture radiation signal has occurred between 1 V/ms and 50 V/ms. 4. The device as claimed in claim 1, wherein said electronic circuitry is provided with a driver connected to a LED bar graph for displaying the analog level. 5. The device as claimed in claim 1, wherein said optical fibre conduit comprises a bundle of multi mode optical fibre strands enclosed in a spiral, flexible, mild steel hollow wire with plastic sheath. 6. The device as claimed in the preceding claims, said optical fibre conduit is connected to a silicon photodiode through a sensor holder. 7. The device as claimed in claim 6, wherein said optical fibre conduit comprises specially designed ferrules provided at the two ends of said conduit. 8. The device as claimed in claim 7, wherein dimension of said ferrules can be decided on the basis of the size of fibre conduit and the number of optical fibre strands in the fibre conduit. 9. The device as claimed in claim 1, wherein the spectral response of said device is 350 - 1050 nm and the response time is 7 µs for analog output and 100 µs for level detection and edge detection output. 10. A device for detecting presence of hot stocks in for examples, rolling mills in steel and metal industry, said device, substantially as herein described and illustrated in the accompanying drawings. This invention relates to a device for detecting presence of hot stocks in for example, rolling mills in steel and metal industry, said device comprising: light capturing optics provided in a housing for capturing radiation from said hot stocks; an optical fibre conduit for carrying said radiation from hot stocks to a remote place; and an electronic circuitry arranged in said remote place for detecting presence of hot stocks from a high or low radiation signal received. |
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00527-kol-2005-description provision.pdf
527-kol-2005-correspondence-1.1.pdf
527-kol-2005-correspondence.pdf
527-kol-2005-description (provisional).pdf
527-kol-2005-examination report-1.1.pdf
527-kol-2005-examination report.pdf
527-kol-2005-granted-abstract.pdf
527-kol-2005-granted-claims.pdf
527-kol-2005-granted-description (complete)-1.1.pdf
527-kol-2005-granted-description (complete).pdf
527-kol-2005-granted-drawings.pdf
527-kol-2005-granted-form 1.pdf
527-kol-2005-granted-form 2.pdf
527-kol-2005-granted-letter patent.pdf
527-kol-2005-granted-specification.pdf
527-kol-2005-reply to examination report-1.1.pdf
527-kol-2005-reply to examination report.pdf
Patent Number | 246602 | |||||||||||||||
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Indian Patent Application Number | 527/KOL/2005 | |||||||||||||||
PG Journal Number | 10/2011 | |||||||||||||||
Publication Date | 11-Mar-2011 | |||||||||||||||
Grant Date | 07-Mar-2011 | |||||||||||||||
Date of Filing | 17-Jun-2005 | |||||||||||||||
Name of Patentee | TATA STEEL LIMITED | |||||||||||||||
Applicant Address | AUTOMATION DIVISION, JAMSHEDPUR | |||||||||||||||
Inventors:
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PCT International Classification Number | B21D 11/06 | |||||||||||||||
PCT International Application Number | N/A | |||||||||||||||
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