CN1038877A - Laser elongation measuring unit for steel sheets - Google Patents
Laser elongation measuring unit for steel sheets Download PDFInfo
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- CN1038877A CN1038877A CN 89101792 CN89101792A CN1038877A CN 1038877 A CN1038877 A CN 1038877A CN 89101792 CN89101792 CN 89101792 CN 89101792 A CN89101792 A CN 89101792A CN 1038877 A CN1038877 A CN 1038877A
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- laser
- steel plate
- sheet metal
- lens
- ray machine
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Abstract
The present invention relates to the measurement mechanism of sheet metal extensibility, be that a kind of laser that utilizes is directly measured sheet metal before rolling and the travelling speed of rolling back sheet metal, thereby obtain sheet metal extensibility value.This device mainly is made up of ray machine probe and signal Processing and display part, and described ray machine probe comprises lasing light emitter, optical beam-splitter, diversing lens, receiver lens, photomultiplier and prime amplifier and shell composition.Utilize relevant formation interference fringe such as the sheet metal when passing interference fringe of two bundle laser focusings on the sheet metal face, produce the scattered light that contains frequency signal and be received and handle, show, finally obtain the extensibility value of sheet metal.
Description
The present invention relates to the measurement mechanism of sheet metal extensibility, especially, can in the cold-rolled steel sheet operation of rolling, carry out the measurement of extensibility immediately with the accurate measurement of laser to the cold-rolled steel sheet extensibility.
In the cold-rolling of steel plate process,, need to obtain steel plate extensibility parameter, thereby shut out the steel plate that satisfies the extensibility requirement by the control milling train in order to guarantee the quality of steel plate rolling.Way in the past is to adopt nip drum formula contact measurement, promptly load onto contact nip drum sensor respectively at the import and export of rolling mill roll, nip drum is along with the preceding of steel plate and then rotation, can obtain the speed of steel plate by the rotating speed of measuring the import and export nip drum respectively, thereby obtain the extensibility of steel plate in the operation of rolling front and back.The shortcoming that this mode is measured is:
1, nip drum need contact with steel plate, the degree of tightness of this contact can have influence on the result of measurement, and contact is tight, nip drum weares and teares easily, the also easy cut of surface of steel plate, the contact pine, nip drum skids easily, directly influence the measurement of rotating speed, and because operating the beating of rolling mill vibration and steel plate accomplishes to make all the time contacting of nip drum and steel plate to keep just right with being difficult to assurance always.
Require nip drum to lift when 2, steel plate pierces into and withdraws from, and need nip drum to depress when steel plate rolling, this operation also can bring certain influence to measuring accuracy except bringing the inconvenience to production.
The object of the present invention is to provide a kind of measuring accuracy height, do not draw the noncontact optical measurement device that decreases surface of steel plate.The measuring principle of this measurement mechanism institute foundation and the basic comprising of device are described below:
In the front and back of roll a ray machine probe is set respectively, utilizes the travelling speed of ray machine probe measurement steel plate in rolling front and back.
The principle that the ray machine probe tests the speed is, by laser instrument, as a He-Ne laser instrument, send beam of laser, this Shu Jiguang is divided into two bundle directional lights by beam splitter, they focus on the surface of steel plate through optical lens, because two bundle light is relevant, forms one group of interference fringe (seeing accompanying drawing 3) at surface of steel plate.Tested surface of steel plate is equivalent to many scattering particles, and the scattered light intensity that scattering particle produced that passes striped light and shade place changes, and this scattered light change frequency is signal frequency.If fringe spacing is △ X, then:
△ X=(λ)/(2sin θ/2)
In the formula: λ is an optical maser wavelength, and θ is the angle of two-beam, after set up the position of laser probe, the θ angle determines that selected laser wavelength lambda that laser instrument sends is known also, and then fringe spacing △ X also is a definite value, if it is V that scattering particle is just being worn the speed of striped, then signal frequency is:
f
d=(V)/(△ X)=(2Vsin θ/2)/(λ)
To have signal frequency f
dScattered light receive a part by the optical receiving system that is arranged in the same ray machine probe, and this part light is assembled by receiver lens, incide the negative electrode receiving surface of photomultiplier, send into preposition amplification through opto-electronic conversion with after amplifying, input signal processor again, thereby picked up signal frequency f
d, the process data processor provides the travelling speed V value of steel plate again.
Can record the travelling speed of steel plate before and after the roll respectively by said method, and the extensibility K=(V of steel plate
2-V
1)/(V
1), wherein: V
1The travelling speed of expression steel plate before roll, V
2The travelling speed of expression steel plate behind roll.By the V that has recorded
1And V
2Value can provide the extensibility value of steel plate.
Measurement mechanism provided by the present invention and employed measuring method are that a kind of noncontact that utilizes laser to carry out is accurately measured, its measuring accuracy height, and measuring error is less than 0.2%.
Fig. 1 represents the synoptic diagram of measurement mechanism.
The structural representation of Fig. 2 presentation graphs 1 described ray machine probe.
The conoscope image of two bundle laser coherences in Fig. 3 presentation graphs 2 described ray machine probes.
Below in conjunction with accompanying drawing measurement mechanism of the present invention is further described:
Fig. 1 as seen, measurement mechanism is processed by ray machine probe and signal and is shown that the two large divisions forms. Wherein said ray machine probe comprises the ray machine probe 2 after being arranged on the front ray machine probe 1 of roll and being arranged on roll, and described signal is processed and the display part comprises: signal processor 3,4, data processor 6 and oscillograph 6, display 7,8 and printer 9.
Ray machine probe (see figure 2) in invention mainly comprises: laser instrument 11, Laser Power Devices 21, optical beam-splitter 31, diversing lens 41, receiver lens 51, photomultiplier 61, preamplifier 71 and shell 81. Beam of laser L by laser instrument (11) sends is divided into two-beam L through beam splitter 311And L2, this two bundle directional light process diversing lens (41) focuses on the surface of steel plate (10), at surface of steel plate two-beam L1And L2The relevant one group of interference fringe (seeing shown in Figure 3) that forms, when passing striped, surface of steel plate produces the scattered light that contains frequency signal, the part scattered light is received by receiver lens (51), and the light that receives converged to photomultiplier (61), being input to preamplifier 71 by the signal of telecommunication of photomultiplier output amplifies, input to again signal processor 3 and 4 and data processor 5 through amplifying signal, provide respectively steel plate speed of service V1And V2 Signal processor is the phase-locking type frequency tracker, data processor converts frequency output to numeral output, and is input to computer and carries out data and process, and by computer the result is sent into display 7 at last, 8 carry out numeral shows, controls simultaneously the measurement result that printer 9 was printed in a period of time. The final certainty of measurement to the steel plate percentage elongation of device can reach 0.2% in sum.
Embodiments of the invention are: laser instrument adopts the intra-cavity He-Ne laser device, and its output optical maser wavelength is 0.6328nm, and power is～3mw that the output zlasing mode is TEM
00, the angle of divergence～1 milliradian.Beam splitter is made of two parallelogram prism gummeds, and the beam splitting distance is 50mm, and optical loss is 10%.
Diversing lens is a compound lens, and focal length is 1600mm, and clear aperature is φ 70mm; The focal length of receiver lens is 110mm, and clear aperature is φ 34mm.Photomultiplier is selected GDB24 for use, the negative electrode effective diameter is φ 23mm, spectral response～3000-8500A °, the supply voltage scope of photomultiplier be (400V～-1000V), voltage can change along with the power of scattered light signal, and regulate automatically, to keep photomultiplier output signal amplitude constant.An angle is arranged between the light path of receiver lens and diversing lens, will determine according to the relative installation of these two kinds of lens, angle should obtain heal better little, as desirable θ=3～5 degree scopes.
Ray machine probe 1 and 2 is to be installed on the frame of milling train by link, the position of its installation should guarantee the Surface Vertical of emitted laser bundle and steel plate 10, what ray machine probe 1 was positioned at roll 11 treats rolled steel plate one side, ray machine probe 2 is positioned at cold rolling steel plate one side of process of roll 11, and ray machine probe 1 and 2 is positioned at the top of steel plate one side, luminous point mediates on the steel plate width direction, in the longitudinal direction as far as possible near roll.The extensibility measuring error of entire measuring device is less than 0.2%.
Described measurement mechanism has non-cpntact measurement, does not damage surface of steel plate, the certainty of measurement height, and the data processing speed height, simple to operate, the advantage such as convenient can be widely used in sheet metal is detected percentage elongation value when rolling continuously.
Claims (3)
1, a kind of laser measuring device for measuring of sheet metal extensibility, described device is made up of ray machine probe and signal Processing and display part, it is characterized in that described ray machine probe 1 and 2, they are separately positioned on the side top (or below) of the front and rear steel plate to be measured of roll, described signal Processing and display part comprise: signal processor 3,4, data processor 6 and oscillograph 6, display 7,8 and printer 9.
2,, it is characterized in that described ray machine probe comprises laser instrument 11, Laser Power Devices 21, optical beam-splitter 31, diversing lens 41, receiver lens 51, photomultiplier 61, prime amplifier 71 and shell 81 by the described laser measuring device for measuring of claim 1.The beam of laser L that is sent by laser instrument 11 is divided into two-beam L through beam splitter 31
1And L
2, their process diversing lens 41 focus on the surface of steel plate 91, L
1And L
2One group of interference fringe of relevant formation, when passing striped, surface of steel plate produces light scattering, receiver lens 51 receiving unit scattered lights converge to the photomultiplier reception and are amplified by prime amplifier, its output signal is processed and displayed by described signal Processing and display part, obtains steel plate travelling speed and extensibility value.
3, by claim 1,2 described laser measuring device for measuring, it is characterized in that described laser instrument is the He-Ne laser instrument, the angle of divergence～1 milliradian, the beam splitting distance of beam splitter 31 is 50 millimeters, the focal length of diversing lens is 1600 millimeters, clear aperature is～70 millimeters of φ, the receiver lens focal length is 110 millimeters, clear aperature is～and 34 millimeters of φ, the angle theta of receiver lens and diversing lens light path=3～5 degree.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89101792 CN1013993B (en) | 1989-04-08 | 1989-04-08 | Laser measuring device for elongation of metal plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89101792 CN1013993B (en) | 1989-04-08 | 1989-04-08 | Laser measuring device for elongation of metal plate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1038877A true CN1038877A (en) | 1990-01-17 |
| CN1013993B CN1013993B (en) | 1991-09-18 |
Family
ID=4854430
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 89101792 Expired CN1013993B (en) | 1989-04-08 | 1989-04-08 | Laser measuring device for elongation of metal plate |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1013993B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102288784A (en) * | 2011-06-24 | 2011-12-21 | 上海瑞伯德智能系统科技有限公司 | Steel tube conveying state visual detection system based on structured light technology |
| CN102506720A (en) * | 2011-11-03 | 2012-06-20 | 上海理工大学 | Light-scattering device and method for measuring diameter and length of short carbon nano-tube |
| CN104515471A (en) * | 2013-09-30 | 2015-04-15 | 宝山钢铁股份有限公司 | Method for measuring length of steel plate |
| CN109655482A (en) * | 2019-01-16 | 2019-04-19 | 长园电子（东莞）有限公司 | A device for on-line measurement of axial shrinkage of heat shrinkable tubes |
-
1989
- 1989-04-08 CN CN 89101792 patent/CN1013993B/en not_active Expired
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102288784A (en) * | 2011-06-24 | 2011-12-21 | 上海瑞伯德智能系统科技有限公司 | Steel tube conveying state visual detection system based on structured light technology |
| CN102288784B (en) * | 2011-06-24 | 2012-10-10 | 上海瑞伯德智能系统科技有限公司 | Steel tube conveying state visual detection system based on structured light technology |
| CN102506720A (en) * | 2011-11-03 | 2012-06-20 | 上海理工大学 | Light-scattering device and method for measuring diameter and length of short carbon nano-tube |
| CN102506720B (en) * | 2011-11-03 | 2014-06-18 | 上海理工大学 | Light-scattering device and method for measuring diameter and length of short carbon nano-tube |
| CN104515471A (en) * | 2013-09-30 | 2015-04-15 | 宝山钢铁股份有限公司 | Method for measuring length of steel plate |
| CN109655482A (en) * | 2019-01-16 | 2019-04-19 | 长园电子（东莞）有限公司 | A device for on-line measurement of axial shrinkage of heat shrinkable tubes |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1013993B (en) | 1991-09-18 |
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