CN111795632B - On-line automatic measurement method for length of stokehole plate blank - Google Patents
On-line automatic measurement method for length of stokehole plate blank Download PDFInfo
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- 239000002184 metal Substances 0.000 claims abstract description 88
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- 238000005259 measurement Methods 0.000 claims abstract description 29
- 238000000034 method Methods 0.000 claims abstract description 26
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- 238000004519 manufacturing process Methods 0.000 description 6
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- 229910000831 Steel Inorganic materials 0.000 description 4
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
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- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/02—Measuring arrangements characterised by the use of mechanical techniques for measuring length, width or thickness
- G01B5/04—Measuring arrangements characterised by the use of mechanical techniques for measuring length, width or thickness specially adapted for measuring length or width of objects while moving
- G01B5/043—Measuring arrangements characterised by the use of mechanical techniques for measuring length, width or thickness specially adapted for measuring length or width of objects while moving for measuring length
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Abstract
The invention provides an on-line automatic measurement method for the length of a stokehole plate blank, belonging to the technical field of metal processing. The method includes the steps that a laser range finder and a plurality of cold metal detectors are installed on a furnace front slab conveying roller way to achieve on-line automatic measurement of the length of a slab, firstly, the measured data of the laser range finder at the moment are locked and stored when rising edge signals of the cold metal detectors are received in the conveying process of the slab through the roller way, then the effectiveness of the measured data of the laser range finder is judged, and finally, the actual length of the slab is calculated according to the geometrical relations among the laser range finder, the slab and the cold metal detectors. The invention has the advantages of less equipment investment, simple measuring method and large measuring length range, and can complete the measurement of the slab length in the slab conveying process.
Description
Technical Field
The invention relates to the technical field of metal processing, in particular to an on-line automatic measurement method for the length of a stokehole plate blank.
Background
The slab is one of steel billets, is formed by continuous casting of molten steel through a continuous casting machine, is generally called as a slab with a casting blank width-thickness ratio of more than 3, and is mainly used for rolling plates. Before rolling the plate blank, firstly, the plate blank is heated by a heating furnace to make the temperature of the plate blank reach about 1200 ℃, and then the subsequent rolling process is carried out. Before the slab enters the heating furnace, the information of the slab needs to be checked, including the size of the slab, the number of the slab and the like, at present, part of production lines rely on the observation of operators to judge whether the information of the slab meets the requirements, the production efficiency is low, the labor intensity is high, and the production rhythm is seriously influenced. In order to realize the full-automatic checking function of the slab information, the slab size needs to be accurately measured on line, wherein the automatic measurement of the slab length is included.
At present, a slab length measurement method commonly used by many iron and steel enterprises is as follows: the length of the slab is indirectly calculated by utilizing the signal of the cold metal detector and integrating the speed of the roller way, as is known, the speed measuring encoder is not generally arranged on a motor of the roller way, so that the precision of the length of the slab indirectly calculated by utilizing the speed of the roller way is not high, and the measuring method has great measuring deviation after the slab slips on the roller way. The other method for measuring the length of the plate blank comprises the following steps: two or more laser distance measuring instruments are arranged on a slab conveying roller way, the distance between each distance measuring instrument and the head end face and the tail end face of the slab is measured, and then the length of the slab is calculated. In the prior patent, the invention patent 'steel plate slab dimension measuring method and device' describes a slab dimension measuring strategy, which adopts a machine vision method, firstly uses a laser projector to project laser lines in the length direction and the width direction of a slab, then shoots an image of the slab through a camera, and finally identifies and calculates the length and the width of the slab.
Disclosure of Invention
The invention provides an on-line automatic measurement method for the length of a furnace front slab, which is characterized in that a laser range finder and a plurality of cold metal detectors (called cold detection for short) are arranged on a slab conveying roller way to realize the measurement of the length of the slab, the measurement data of the laser range finder at the moment are locked and stored when a rising edge signal of the cold metal detector is received every time during the transportation of the slab by the roller way, then the effectiveness of the measurement data of the locked laser range finder is judged, and finally the actual length of the slab is calculated according to the geometric relationship among the laser range finder, the slab and the cold metal detectors.
According to the method, firstly, in the process of transporting the slab by a roller way, when a rising edge signal of a cold metal detector is received, the measurement data of the laser range finder at the moment are locked and stored, then the effectiveness of the locked measurement data of the laser range finder is judged, and finally the actual length of the slab is calculated according to the geometric relationship among the laser range finder, the slab and the cold metal detector.
The method specifically comprises the following steps:
(1) in the process of conveying the plate blank by the roller way, locking and storing the measurement data of the laser range finder at the moment when a rising edge signal of the cold metal detector is received;
(2) judging the effectiveness of the locked measurement data of the laser range finder by using the effective factor of the measurement data of the laser range finder locked by the rising edge signal of the cold metal detector;
(3) and calculating the actual length of the plate blank according to the geometrical relationship among the laser range finder, the plate blank and the cold metal detector.
Wherein, in the step (1), the laser range finder is arranged outside the slab conveying roller way, the light beam of the laser range finder is higher than and parallel to the horizontal plane of the roller way, the distance between the light beam of the laser range finder and the horizontal plane of the roller way is 0.5 times of the minimum thickness of the slab, the included angle between the light beam of the laser range finder and the central line of the roller way is alpha, and the value range of the alpha is 10-40 degrees.
The cold metal detector adopts a correlation mode, a signal transmitting end of the cold metal detector is installed on the outer side of the roller way and is higher than the horizontal plane of the roller way, a signal receiving end of the cold metal detector is installed on the inner side of the roller way and is lower than the horizontal plane of the roller way, and meanwhile, the light beam emitted by the cold metal detector is ensured to pass through the middle part of the roller way.
The cold metal detector CMD is arranged at the downstream position of the laser range finder in the slab conveying direction and is closest to the laser range finder0And a cold metal detector CMD furthest from the laser rangefindernThe calculation formula of the installation distance between the laser range finder and the laser range finder is respectively as follows:
in the formula, L0Is a CMD0The distance between the laser distance measuring instrument and the laser distance measuring instrument is set; l isnIs a CMDnThe distance between the laser distance measuring instrument and the laser distance measuring instrument is set; dc is the distance between the laser range finder and the central line of the roller way; swminThe minimum width of the plate blank; swmaxThe maximum width of the plate blank; slminThe minimum length of the plate blank; slmaxThe maximum length of the plate blank; alpha is the included angle between the laser range finder beam and the roller way central line.
The estimated value of the installation distance of the cold metal detectors, the number of the required cold metal detectors and the actual installation distance of the cold metal detectors are respectively calculated by the following formula:
wherein Δ L' is an estimated value of the mounting distance between the cold metal detectors; swminThe minimum width of the plate blank; alpha is the included angle between the laser range finder beam and the roller way central line; λ is a correction coefficient and satisfies 0<λ<1; Δ L is the actual mounting spacing of the cold metal detector; l is0Is a CMD0The distance between the laser distance measuring instrument and the laser distance measuring instrument is set; l isnIs a CMDnThe distance between the laser distance measuring instrument and the laser distance measuring instrument is set; n is the number of cold metal detectors required.
In the step (3), according to the geometrical relationship among the laser range finder, the plate blank and the cold metal detectors, calculating the length of the plate blank corresponding to the position of each cold metal detector, and carrying out average value processing, wherein the average value is used as a final plate blank length calculation value, and the calculation formula is as follows:
in the formula, Sl is a calculated value of the length of the plate blank; Δ L is the actual mounting spacing between cold metal detectors; l is0Is a CMD0The distance between the laser distance measuring instrument and the laser distance measuring instrument is set; alpha is the included angle between the laser range finder beam and the roller way central line; lsiMeasuring data of the laser range finder locked for the rising edge signal of the ith cold metal detector; beta is aiAnd measuring a data effective factor for the laser range finder locked by the rising edge signal of the ith cold metal detector, wherein i is the serial number of the cold metal detector.
The effective factor value of the measurement data of the laser range finder locked by the rising edge signal of the ith cold metal detector is as follows:
in the formula, Dc is the distance between the laser range finder and the central line of the roller way; sw is the width of the plate blank; alpha is the included angle between the laser range finder beam and the roller way central line; lsiIs the ith coldThe laser range finder measures data locked by a rising edge signal of the metal detector; k1，K2Is a correction coefficient and satisfies 0<K2≤1≤K1<2。
The technical scheme of the invention has the following beneficial effects:
in the proposal, the measurement of the length of the slab is realized by installing a laser range finder and a plurality of cold metal detectors outside the slab conveying roller way, the number of the required cold metal detectors is calculated according to the length and width range of the slab so as to ensure that the measuring method can cover the length measuring requirements of all specifications of the slab, the method locks the measurement data of the laser range finder through the rising edge signal of the cold metal detector, then judges the validity of the measurement data, and finally takes the average value of the length data of a plurality of plate blanks as the final calculated value of the length of the plate blanks, further ensures the stability and the reliability of the length measurement value, compared with the traditional speed integral measurement method and the machine vision measurement method, the method has the advantages of simple implementation, low cost, high measurement precision and the like, meets the production requirement, and saves the investment cost and the later-stage instrument maintenance cost.
Drawings
FIG. 1 is a schematic view of the measurement principle of the method of the present invention;
FIG. 2 is a schematic view of the mounting spacing of the nearest cold metal detector to the laser rangefinder of the method of the present invention;
FIG. 3 is a schematic view of the installation spacing of the cold metal detector furthest from the laser rangefinder in accordance with the method of the present invention;
FIG. 4 is a schematic view of a cold metal detector installation of the method of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.
The invention provides an on-line automatic measurement method for the length of a stokehole slab.
As shown in figure 1, in the method, firstly, in the process of conveying a slab by a roller way, when a rising edge signal of a cold metal detector is received, the measurement data of the laser range finder at the moment are locked and stored, then, the effectiveness of the locked measurement data of the laser range finder is judged, and finally, the actual length of the slab is calculated according to the geometric relationship among the laser range finder, the slab and the cold metal detector.
The laser range finder is arranged on the outer side of the slab conveying roller way, the light beam of the laser range finder is higher than the horizontal plane of the roller way and is parallel to the horizontal plane of the roller way, the distance between the light beam of the laser range finder and the horizontal plane of the roller way is 0.5 times of the minimum thickness of the slab, the included angle between the light beam of the laser range finder and the central line of the roller way is alpha, and the value range of the alpha is 10-40 degrees.
As shown in fig. 4, the cold metal detector adopts a correlation mode, the signal transmitting end of the cold metal detector is installed outside the roller way and higher than the horizontal plane of the roller way, the signal receiving end of the cold metal detector is installed inside the roller way and lower than the horizontal plane of the roller way, and meanwhile, the light beam emitted by the cold metal detector is ensured to pass through the middle part of the roller way.
The following description is given with reference to specific examples.
The scheme is implemented on a 2150mm rolling line heating furnace front plate blank length measuring system in a certain factory, the plate blank width range of the production line is 1000 mm-2000 mm, the plate blank length range is 9700 mm-18000 mm, and the plate blank thickness range is 135mm, 170mm and 200 mm.
An on-line automatic measurement method for the length of a furnace front slab comprises the following specific implementation scheme:
1) installing a laser range finder outside the slab conveying roller way, wherein the light beam of the laser range finder is higher than and parallel to the horizontal plane of the roller way, the distance between the light beam of the laser range finder and the horizontal plane of the roller way is 0.5 times of the minimum thickness of the slab, the included angle between the light beam of the laser range finder and the central line of the roller way is alpha, and the value of the alpha is 30 degrees;
2) the cold metal detector is installed at a position downstream of the laser range finder in the slab transport direction, and as shown in fig. 2 and 3, the cold metal detector CMD which is closest to the laser range finder is counted0And a cold metal detector CMD furthest from the laser rangefindernInstallation distance from the laser range finder:
in the formula, L0Is a CMD0The distance between the laser distance measuring instrument and the laser distance measuring instrument is set; l isnIs a CMDnThe distance between the laser distance measuring instrument and the laser distance measuring instrument is set; dc is the distance between the laser range finder and the central line of the roller way, and the value is 1500; swminThe minimum width of the plate blank is 1000; swmaxThe maximum width of the plate blank is 2000; slminThe minimum length of the plate blank is 9700; slmaxThe maximum length of the plate blank is 18000.
3) Calculating the estimated value of the installation distance of the cold metal detectors, the number of the required cold metal detectors and the actual installation distance of the cold metal detectors:
wherein Δ L' is an estimated value of the mounting distance between the cold metal detectors; lambda is a correction coefficient and takes a value of 0.9; Δ L is the actual mounting spacing of the cold metal detector; n is the number of cold metal detectors required.
4) According to the geometrical relationship among the laser range finder, the plate blank and the cold metal detector, calculating the length of the plate blank corresponding to the position of each cold metal detector, carrying out average value processing, taking the average value as a final calculated value of the length of the plate blank, and adopting the following calculation formula:
in the formula, Sl is a calculated value of the length of the plate blank; lsiMeasuring data of the laser range finder locked for the rising edge signal of the ith cold metal detector; beta is aiThe significance factor of the measured data is locked for the ith cold metal detector rising edge signal.
The rising edge signal of the ith cold metal detector locks the effective factor value of the measurement data of the laser range finder as follows:
in the formula, Sw is the width of a plate blank; k1，K2To correct the coefficient, K1The value is 1.05, K2The value was 0.95.
After the control method is adopted for measuring the length of the plate blank in front of the 2150 rolling line rolling mill in the factory, the measurement system runs stably, the measurement deviation of the length of the plate blank is less than 20mm, namely, the production requirement is met under the condition of less hardware investment, and the maintenance work of instruments in the later period is relatively simple.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (5)
1. The on-line automatic measurement method for the length of the stokehole slab is characterized by comprising the following steps of: the method comprises the steps that a laser range finder and a plurality of cold metal detectors are installed on a furnace front plate blank conveying roller way to achieve measurement of the length of a plate blank, the laser range finder at the moment is locked and stored when a rising edge signal of the cold metal detector is received in the conveying process of the plate blank through the roller way, then the effectiveness of the locked laser range finder measurement data is judged, and finally the actual length of the plate blank is calculated according to the geometrical relationship among the laser range finder, the plate blank and the cold metal detectors;
the method specifically comprises the following steps:
(1) in the process of conveying the plate blank by the roller way, locking and storing the measurement data of the laser range finder at the moment when a rising edge signal of the cold metal detector is received;
(2) judging the effectiveness of the locked measurement data of the laser range finder by using the effective factor of the measurement data of the laser range finder locked by the rising edge signal of the cold metal detector;
(3) calculating the actual length of the plate blank according to the geometrical relationship among the laser range finder, the plate blank and the cold metal detector;
the laser range finder is arranged on the outer side of the slab conveying roller way, the light beam of the laser range finder is higher than the horizontal plane of the roller way and is parallel to the horizontal plane of the roller way, the distance between the light beam of the laser range finder and the horizontal plane of the roller way is 0.5 times of the minimum thickness of the slab, the included angle between the light beam of the laser range finder and the central line of the roller way is alpha, and the value range of the alpha is 10-40 degrees;
in the step (3), according to the geometrical relationship among the laser range finder, the plate blank and the cold metal detectors, the length of the plate blank corresponding to the position of each cold metal detector is calculated and averaged, the average value is used as a final calculated value of the length of the plate blank, and the calculation formula is as follows:
in the formula, Sl is a calculated value of the length of the plate blank; Δ L is the actual mounting spacing between cold metal detectors; l is0A cold metal detector CMD nearest to the laser range finder0The distance between the laser distance measuring instrument and the laser distance measuring instrument is set; alpha is the included angle between the laser range finder beam and the roller way central line; lsiMeasuring data of the laser range finder locked for the rising edge signal of the ith cold metal detector; beta is aiAnd measuring a data effective factor for the laser range finder locked by the rising edge signal of the ith cold metal detector, wherein i is the serial number of the cold metal detector.
2. The on-line automatic measurement method for the length of the stokehold slabs as claimed in claim 1, wherein: the cold metal detector adopts a correlation mode, a signal transmitting end of the cold metal detector is installed on the outer side of the roller way and is higher than the horizontal plane of the roller way, a signal receiving end of the cold metal detector is installed on the inner side of the roller way and is lower than the horizontal plane of the roller way, and meanwhile, the light beam emitted by the cold metal detector is ensured to pass through the middle part of the roller way.
3. The on-line automatic measurement method for the length of the stokehold slabs as claimed in claim 1, wherein: the cold metal detector is arranged on the laser range finder in the slab conveying directionDownstream of the laser rangefinder, a cold metal detector CMD nearest to the laser rangefinder0And a cold metal detector CMD furthest from the laser rangefindernThe calculation formula of the installation distance between the laser range finder and the laser range finder is respectively as follows:
in the formula, L0Is a CMD0The distance between the laser distance measuring instrument and the laser distance measuring instrument is set; l isnIs a CMDnThe distance between the laser distance measuring instrument and the laser distance measuring instrument is set; dc is the distance between the laser range finder and the central line of the roller way; swminThe minimum width of the plate blank; swmaxThe maximum width of the plate blank; slminThe minimum length of the plate blank; slmaxThe maximum length of the plate blank; alpha is the included angle between the laser range finder beam and the roller way central line.
4. The on-line automatic measurement method for the length of the stokehold slabs as claimed in claim 1, wherein: the number n of cold metal detectors is calculated by the following formula:
wherein L isnCold metal detector CMD furthest from laser rangefindernThe distance between the laser distance measuring instrument and the laser distance measuring instrument is set; l is0A cold metal detector CMD nearest to the laser range finder0The distance between the laser distance measuring instrument and the laser distance measuring instrument is set; Δ L' is an estimate of the mounting spacing between cold metal detectors;
the estimated value Δ L' of the installation spacing between the cold metal detectors is calculated by the following formula:
wherein λ is a correction coefficient and satisfies 0<λ<1；SwminIs a slabA minimum width; alpha is the included angle between the laser range finder beam and the roller way central line;
the actual mounting distance Δ L of the cold metal detector is calculated by the following formula:
5. the on-line automatic measurement method for the length of the stokehold slabs as claimed in claim 1, wherein: the effective factor value of the measurement data of the laser range finder locked by the rising edge signal of the ith cold metal detector is as follows:
in the formula, Dc is the distance between the laser range finder and the central line of the roller way; sw is the width of the plate blank; alpha is the included angle between the laser range finder beam and the roller way central line; lsiMeasuring data of the laser range finder locked for the rising edge signal of the ith cold metal detector; k1，K2Is a correction coefficient and satisfies 0<K2≤1≤K1<2。
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| JPS58188556A (en) * | 1982-04-30 | 1983-11-04 | Nippon Kokan Kk <Nkk> | Method for controlling width of steel plate in continuous casting |
| CN1182368C (en) * | 2002-11-15 | 2004-12-29 | 广东省韶关钢铁集团有限公司 | Automatic in-line length measuring system |
| CN102589449B (en) * | 2011-01-07 | 2015-04-01 | 宝山钢铁股份有限公司 | Length measuring device of slab and measuring method |
| CN102322803B (en) * | 2011-08-12 | 2013-08-28 | 中冶南方(武汉)威仕工业炉有限公司 | Steel blank length-measurement positioning system |
| CN102620663A (en) * | 2012-03-21 | 2012-08-01 | 莱芜钢铁集团有限公司 | Online hot-rolled strip blank length measuring device and using method thereof |
| CN103712555B (en) * | 2013-07-10 | 2016-06-29 | 湖北工业大学 | Automotive frame pilot hole vision on-line measurement system and method thereof |
| CN104457570B (en) * | 2014-11-28 | 2017-11-14 | 北京中远通科技有限公司 | A kind of strand location measurement method |
| CN104848793B (en) * | 2015-06-01 | 2017-06-06 | 衡阳镭目科技有限责任公司 | The method and system for having cut continuous casting billet length that on-line measurement is conveyed at a high speed |
| CN106705909A (en) * | 2017-03-07 | 2017-05-24 | 攀钢集团西昌钢钒有限公司 | Slab overlength detection method and detection device |
| CN108731588B (en) * | 2017-04-25 | 2021-01-12 | 宝山钢铁股份有限公司 | Device and method for measuring length and diagonal line of machine vision steel plate |
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