CN104515471A - Method for measuring length of steel plate - Google Patents
Method for measuring length of steel plate Download PDFInfo
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- CN104515471A CN104515471A CN201310464630.XA CN201310464630A CN104515471A CN 104515471 A CN104515471 A CN 104515471A CN 201310464630 A CN201310464630 A CN 201310464630A CN 104515471 A CN104515471 A CN 104515471A
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Abstract
The invention discloses a method for measuring length of a steel plate, relates to end cutting technology of a finishing line of a thick plate production line and solves the problem that existing steel plates are low in sectional cutting accuracy. The method includes enabling an end cutting conveying roller way to start running, enabling the steel plate to move forwards, enabling a laser velocimeter mounted at an outlet of an end cutting shear and at a position of L0 away from a cutting edge of a lower shear blade of the end cutting shear to emit laser, and transmitting feedback signals when the laser irradiates the steel plate to a PLC (programmable logic controller); enabling the PLC to start performing length measuring detection on the steel plate; comparing L with target length Lm preset in the PLC; when L is equal to Lm, enabling the conveying roller way to stop running, enabling the steel plate to stop moving, starting the end cutting shear, and automatically cutting the steel plate at a position of Lm; if the last section is not cut, cutting a next section, and continuing to execute the above steps until the last section is cut. In the method, the laser velocimeter is utilized to measure length of the steel plate, so that accuracy in sectional cutting of the steel plate is improved effectively, yield is increased, and cutting efficiency is improved while labor intensity is lowered.
Description
Technical field
The present invention relates to the crop technology of plate production line finishing line, long method surveyed by the steel plate referred in particular on a kind of slab shear line.
Background technology
The shearing of steel plate is one important procedure in Heavy plate production process, and the shearing quality not only required, also should have higher production efficiency.
Existing slab rolling line One's name is legion, but slab shearing line equipment is automatically controlling and is still having certain problem in shear precision.Mainly wherein rectangular method is surveyed to steel plate and have problem, cause shear precision not high.
In measurement of the steel plate and location, what a lot of iron and steel enterprise adopted is contact type measurement and localization method, as in crop process, adopt manual measurement of ruling, the artificial method to line shearing, and adopt scale dolly to control when cutting to length, then carry out measuring and shearing in conjunction with the method for measuring roller calibration.This contact type measurement and localization method low in input cost, but trouble is installed, take up an area large, maximum shortcoming is that measurement and location are inaccurate, has had a strong impact on the shear precision of product, has constrained the lumber recovery of product.
Be carry out nibbling shear to steel plate end to end and in position for what excise motherboard at the crop shears of more advanced slab shearing line equipment, in slab nibbling shear process wherein, measurement of length is most important.The method that the segmentation of crop shears adopts mounting for grating and measuring roller to combine at present positions slab and measures (contact type measurement), but adopts measuring roller to carry out measurement to slab and will guarantee that precision just must meet two conditions: the accurate diameter of (1) measuring roller roller body need; (2) between measuring roller roller and steel plate without relative sliding, need reasonable set cylinder pressure, hypertonia, can make surface of steel plate produce bright band, hypotony, will produce relative sliding between measuring roller and steel plate, affect the precision of areal survey.
The measuring method of the Chinese patent CN1307225A(long instrument of laser automatic measuring), the multiple laser measuring device for measuring of the method follows the tracks of steel plate head, the quantity of the measurement mechanism of use is chosen according to the needs measured, measurement receiving magazine is installed on the opposite side of roller-way, optical filter is by after bias light filtering, current effective receiver lens is by the image formation by rays of steel plate scattering on CCD, and the system light signal received gives post processing electric circuit after CCD opto-electronic conversion.Treatment circuit amplifies signal, binary conversion treatment, then terminal is given, first terminal judges after receiving signal that steel plate head is positioned at that measurement zone, calculate the position of steel plate head in this measurement zone according to signal, the measurement area code of comprehensive steel plate and extension position are calculated the length value of steel plate by computing machine.The multiple laser measuring device for measuring of the method follows the tracks of steel plate head, thus accurately records the length of steel plate.The device that this method adopts is too complicated, affects production efficiency.
Summary of the invention
The object of the invention is to overcome prior art Problems existing, provide a kind of steel plate to survey long method, it can improve segmentation precision and the production efficiency of crop shears.
The object of the invention is to be achieved through the following technical solutions:
A long method surveyed by steel plate, and it comprises following steps:
S1, rollgang comes into operation, the steel plate of segmentation is needed to be advanced forward by rollgang, be arranged on crop shears Way out and send laser from the laser velocimeter on the fixed support at the lower scissor blade cutting edge distance L0 place of crop shears, when steel plate head arrives immediately below laser velocimeter, laser to beat on steel plate and its feedback signal back in laser velocimeter, this feedback signal is sent to PLC by laser velocimeter, and PLC program brings into operation;
S2, PLC differentiate whether knotmeter has feedback signal, if do not have feedback signal, continue above-mentioned steps S1;
S3, if differentiate there is feedback signal to knotmeter in above-mentioned steps S1, starts to survey long detection to steel plate;
S4, PLC carry out length-measuring meter calculation, and on display picture, show the long result L of survey;
S5, compares the long result L of survey with the target length Lm be preset in PLC;
S6, differentiates whether L equals Lm, if be not equal to, continues above-mentioned steps S3;
S7, equal Lm if differentiated in above-mentioned steps S6 to L, rollgang is out of service, and steel plate stops advancing;
S11, crop shears start, and in steel plate Lm length, place carries out automatic shearing to steel plate, shear good laser velocimeter later and reset;
S12, differentiates whether steel plate is that final stage is sheared, and shear if not final stage, need carry out the shearing of next segmentation, then continue to perform step S1-S11, if final stage is sheared, flow process terminates.
The computation process that in described step S4, length-measuring meter is calculated is as follows:
S41, measures the length value L 1 of steel plate head by laser velocimeter by laser velocimeter;
S42, L1 value is sent to PLC by laser velocimeter;
The actual segment length value L that S43, PLC calculate steel plate according to L1 value and laser velocimeter to the distance L0 value of crop shears lower scissor blade is: L=L0+L1, and described actual segment length value refers to the distance from steel plate head to end shears cutting edge;
L value is presented on the picture of display by S44, PLC.
In described step S41, to measure steel plate head as follows by the process of the length value L 1 of laser velocimeter for laser velocimeter:
Laser velocimeter utilizes laser beam emitting device to produce two beam interferometer light beams and forms interference fringe on the surface of steel plate, and spot separation D is the wavelength of two beam interferometer light beams and the function of incident angle:
in formula, λ is the optical maser wavelength that laser beam emitting device produces; α is incident angle, and it refers to half angle of two beam interferometer light beams;
Steel plate travelling speed v is:
wherein
f is the frequency of Laser emission light beam, and it is photosignal frequency;
By just obtaining the length value L 1 of steel plate head by laser velocimeter to the integration of speed in a period of time cycle T:
Also following steps are comprised between described step S7 and step S11:
S8, L and Lm compare, and differentiate whether its error is less than 2mm, if be less than 2mm, enter described step S11;
S9, if the result that above-mentioned steps S8 compares, L and Lm error is not be less than 2mm, and alerting signal appears in display picture;
S10, need Non-follow control rollgang to reverse after there is alerting signal, steel plate is advanced backward, and L and Lm is compared, and error is less than 2mm, L value and Lm value is subtracted each other close to zero and not for entering described step S11 during negative value.
Beneficial effect of the present invention:
In slab nibbling shear process, measurement of length is most important, and traditional measuring method utilizes mechanical type code-disc to carry out contact type measurement, and contact type measurement mainly exists two problems: occur skidding in measuring process, affects measuring accuracy; Mechanical hook-up has wearing and tearing after severe production scene uses for a long time, affects serviceable life.For addressing these problems, it is long that this method utilizes laser velocimeter (contactless measurement) to carry out survey to steel plate, laser velocimeter can measure the speed that steel plate runs accurately in real time, also the distance of steel plate walking can just be measured accurately, effectively improve the precision that steel plate sectional is sheared, improve lumber recovery, also improve shear efficiency and reduce labour intensity.
For further illustrating above-mentioned purpose of the present invention, design feature and effect, below with reference to accompanying drawing, the present invention is described in detail.
Accompanying drawing explanation
Fig. 1 is laser velocimeter measuring principle schematic diagram;
Fig. 2 is the schematic diagram of the spot separation that in Fig. 1, two beam interferometer light beams produce after surface of steel plate forms interference fringe;
Fig. 3 is the position view of laser velocimeter of the present invention in crop shears;
Fig. 4 is the schematic top plan view of Fig. 3;
Fig. 5 is that long method flow diagram surveyed by steel plate of the present invention.
Embodiment
Accompanying drawing below in conjunction with embodiment is described in detail to the specific embodiment of the present invention.
Steel plate of the present invention is surveyed long method and is referred in steel plate rolling line crop shears shearing steel plate measurement of length method, see Fig. 3-Fig. 4, in steel plate rolling line equipment, one laser velocimeter 32 is installed in crop shears exit position, specifically, laser velocimeter 32 is arranged on the Way out of crop shears and from the fixed support 31 at the lower scissor blade cutting edge distance L0 place of end shears cutting edge 34, L0 must be less than the minimum fragment size of steel plate 11.
Immediately below laser velocimeter 32 (in Fig. 4 direction shown in chain double-dashed line), install a reflector 41 below rollgang 33, the reflective surface of reflector 41 becomes the position of non-90 degree (reflective surface of reflector 41 favours the roller plane 42 of rollgang 33) with laser beam.In Fig. 3, steel plate 11, with the rotation of rollgang 33, is advanced to A direction.When steel plate 11 head is by laser velocimeter 32, start the measuring-signal of laser velocimeter 32, laser velocimeter 32 constantly measures the length of steel plate head by laser velocimeter, when recording the section length needing to shear with crop shears, steel plate head is L1 by the length value of laser velocimeter, now, actual segment length value (distance from steel plate head to the end shears cutting edge) L of steel plate is: L=L0+L1.Laser velocimeter 32 sends measured sector boss angle value L to the controller PLC of operation room by signal, the nibbling shear making sector boss angle value L participate in PLC slab controls.
Laser velocimeter 32 adopts laser Dppler veloicty measurement principle to carry out accurately measuring to length and speed, this is a kind of non-contact measuring technology, as shown in Figure 1, laser velocimeter utilizes laser beam emitting device to produce two beam interferometer light beams and forms interference fringe on the surface of steel plate 11, measure the speed that steel plate 11 runs, then the integration of Negotiation speed and time calculates the distance L1 that steel plate 11 passes through.
Its computation process is (this is prior art, does not describe in detail):
Spot separation D is the wavelength of two beam interferometer light beams and the function of incident angle:
in formula, λ is the optical maser wavelength that laser beam emitting device produces, and α is incident angle (incident angle α refers to half angle of two beam interferometer light beams).Steel plate travelling speed v is:
wherein
f is the frequency (photosignal frequency) of Laser emission light beam is the length value of the steel plate head that detects in real time of laser velocimeter by laser velocimeter by just obtaining steel plate steel plate head to the integration of speed in certain section of period of time T by the length L1(of laser velocimeter again):
wherein, T is measuring period, and it is not a fixed value, and the change according to T ceaselessly obtains length L1 value.
The measuring method of laser without contact is simple, and precision is very high simultaneously, and reduce a lot of interference than the measuring method of contact, do not affect rhythm of production again, be a kind of desirable measuring method simultaneously.
Steel plate of the present invention surveys the flow process of rectangular method see Fig. 5, and it comprises following steps:
S1, rollgang comes into operation, the steel plate of segmentation is needed to be advanced forward by rollgang, be arranged on crop shears Way out and send laser from the laser velocimeter on the fixed support at the lower scissor blade cutting edge distance L0 place of crop shears, when steel plate does not arrive immediately below laser velocimeter, laser is beaten does not have feedback signal being on the reflector below the rollgang immediately below laser velocimeter (reflective surface of reflector favours the roller plane of rollgang), at this moment, the program of the programmable controller PLC be connected with laser velocimeter is not run; Arrive immediately below laser velocimeter once steel plate head, laser to beat on steel plate and its feedback signal back in laser velocimeter, this feedback signal is sent to PLC by laser velocimeter, PLC program brings into operation, therefore, before steel plate head arrives immediately below laser velocimeter, laser velocimeter is in waiting status;
S2, PLC differentiate whether knotmeter has feedback signal, if do not have feedback signal, continue above-mentioned steps S1;
S3, if differentiate there is feedback signal to knotmeter in above-mentioned steps S1, starts to survey long detection to steel plate;
S4, PLC carry out length-measuring meter calculation, and on display picture, show the long result L of survey, and the computation process that length-measuring meter is wherein calculated is as follows:
S41, measures the length value L 1 of steel plate head by laser velocimeter by laser velocimeter:
Laser velocimeter utilizes laser beam emitting device to produce two beam interferometer light beams and forms interference fringe on the surface of steel plate, and spot separation D is the wavelength of two beam interferometer light beams and the function of incident angle:
in formula, λ is the optical maser wavelength that laser beam emitting device produces; α is incident angle, and it refers to half angle of two beam interferometer light beams;
Steel plate travelling speed v is:
wherein
f is the frequency of Laser emission light beam, and it is photosignal frequency;
The length value of the steel plate head that detects in real time of laser velocimeter by laser velocimeter by just obtaining steel plate head to the integration of speed in a period of time cycle T by the length value L 1(of laser velocimeter):
S42, L1 value is sent to PLC by laser velocimeter;
The actual segment length value L that S43, PLC calculate steel plate according to L1 value and laser velocimeter to the distance L0 value of crop shears lower scissor blade is: L=L0+L1, and described actual segment length value refers to the distance from steel plate head to end shears cutting edge;
L value is presented on the picture of display by S44, PLC;
S5, compares the long result L of survey with the target length Lm be preset in PLC;
S6, differentiates whether L equals Lm, if be not equal to, continues above-mentioned steps S3;
S7, equal Lm if differentiated in above-mentioned steps S6 to L, rollgang is out of service, and steel plate stops advancing;
S8, L and Lm compare, and differentiate whether its error is less than 2mm;
S9, if the result that above-mentioned steps S8 compares, L and Lm error is not be less than 2mm, and alerting signal appears in display picture;
S10, need Non-follow control rollgang to reverse after there is alerting signal, steel plate is advanced backward, and L and Lm is compared, and error is less than 2mm;
S11, if in above-mentioned steps S8, differentiates that the error compared to L and Lm is less than 2mm, or controlled to the error that L and Lm compares in above-mentioned steps S10 and be less than 2mm, then crop shears start, and in steel plate Lm length, place carries out automatic shearing to steel plate, shear good laser velocimeter later and reset;
S12, differentiates whether steel plate is that final stage is sheared, and shear if not final stage, need carry out the shearing of next segmentation, then continue to perform step S1-S11, if final stage is sheared, flow process terminates.
The steel plate length data detected in real time in above-mentioned flow process can on the picture of display, and the value that picture shows is L=L0+L1, L0 is definite value, and L1 is the data that laser velocimeter detects in real time, is becoming always, and therefore L value is simultaneously also in change.
Target length value Lm in L value and controller is carrying out subtracting each other comparing always, and when differentiating that the difference obtaining the two is zero in above-mentioned steps S7, rollgang is out of service, and steel plate stops advancing; Crop shears meeting automatic shearing, then enter above-mentioned steps S11.But because inertia effect when rollgang stops operating can make steel plate continue to go ahead a bit, for this reason, step S8-S11 is added in flow process, L value and Lm value are subtracted each other close to zero and for negative value time rollgang out of service, the control errors of the two is being no more than 2mm, if more than 2mm, there is alerting signal in display picture, operator's manual operation roller-way reversion as required, makes error information reach minimum, then shears.
Those of ordinary skill in the art will be appreciated that, above embodiment is only used to object of the present invention is described, and be not used as limitation of the invention, as long as in essential scope of the present invention, the change of the above embodiment, modification all will be dropped in the scope of claim of the present invention.
Claims (4)
1. a long method surveyed by steel plate, it is characterized in that comprising following steps:
S1, rollgang comes into operation, the steel plate of segmentation is needed to be advanced forward by rollgang, be arranged on crop shears Way out and send laser from the laser velocimeter on the fixed support at the lower scissor blade cutting edge distance L0 place of crop shears, when steel plate head arrives immediately below laser velocimeter, laser to beat on steel plate and its feedback signal back in laser velocimeter, this feedback signal is sent to PLC by laser velocimeter, and PLC program brings into operation;
S2, PLC differentiate whether knotmeter has feedback signal, if do not have feedback signal, continue above-mentioned steps S1;
S3, if differentiate there is feedback signal to knotmeter in above-mentioned steps S1, starts to survey long detection to steel plate;
S4, PLC carry out length-measuring meter calculation, and on display picture, show the long result L of survey;
S5, compares the long result L of survey with the target length Lm be preset in PLC;
S6, differentiates whether L equals Lm, if be not equal to, continues above-mentioned steps S3;
S7, equal Lm if differentiated in above-mentioned steps S6 to L, rollgang is out of service, and steel plate stops advancing;
S11, crop shears start, and in steel plate Lm length, place carries out automatic shearing to steel plate, shear good laser velocimeter later and reset;
S12, differentiates whether steel plate is that final stage is sheared, and shear if not final stage, need carry out the shearing of next segmentation, then continue to perform step S1-S11, if final stage is sheared, flow process terminates.
2. long method surveyed by steel plate as claimed in claim 1, it is characterized in that:
The computation process that in described step S4, length-measuring meter is calculated is as follows:
S41, measures the length value L 1 of steel plate head by laser velocimeter by laser velocimeter;
S42, L1 value is sent to PLC by laser velocimeter;
The actual segment length value L that S43, PLC calculate steel plate according to L1 value and laser velocimeter to the distance L0 value of crop shears lower scissor blade is: L=L0+L1, and described actual segment length value refers to the distance from steel plate head to end shears cutting edge;
L value is presented on the picture of display by S44, PLC.
3. long method surveyed by steel plate as claimed in claim 2, it is characterized in that:
In described step S41, to measure steel plate head as follows by the process of the length value L 1 of laser velocimeter for laser velocimeter:
Laser velocimeter utilizes laser beam emitting device to produce two beam interferometer light beams and forms interference fringe on the surface of steel plate, and spot separation D is the wavelength of two beam interferometer light beams and the function of incident angle:
in formula, λ is the optical maser wavelength that laser beam emitting device produces; α is incident angle, and it refers to half angle of two beam interferometer light beams;
Steel plate travelling speed v is:
wherein
f is the frequency of Laser emission light beam, and it is photosignal frequency;
By just obtaining the length value L 1 of steel plate head by laser velocimeter to the integration of speed in a period of time cycle T:
4. long method surveyed by steel plate as claimed in claim 1, it is characterized in that:
Also following steps are comprised between described step S7 and step S11:
S8, L and Lm compare, and differentiate whether its error is less than 2mm, if be less than 2mm, enter described step S11;
S9, if the result that above-mentioned steps S8 compares, L and Lm error is not be less than 2mm, and alerting signal appears in display picture;
S10, need Non-follow control rollgang to reverse after there is alerting signal, steel plate is advanced backward, and L and Lm is compared, and error is less than 2mm, L value and Lm value is subtracted each other close to zero and not for entering described step S11 during negative value.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107971347A (en) * | 2017-10-20 | 2018-05-01 | 唐山中厚板材有限公司 | The thick online hot long method of survey of hot rolled plate in one kind |
| CN109420795A (en) * | 2017-08-23 | 2019-03-05 | 宝山钢铁股份有限公司 | A kind of the first knife of slab head shearing positioning device and its control method |
| CN109596049A (en) * | 2018-12-28 | 2019-04-09 | 沈阳建筑大学 | A kind of hot steel plate end Shearing Optimization method after rolling |
| CN109740596A (en) * | 2018-12-28 | 2019-05-10 | 中冶京诚工程技术有限公司 | Intelligent video identification system and method for steel plate head cutting positioning |
| CN110434390A (en) * | 2019-07-19 | 2019-11-12 | 山东钢铁集团有限公司 | A kind of online scale automatic paragraphing cutting system of steel plate in irregular shape, method and shearing equipment |
| CN112570792A (en) * | 2019-09-30 | 2021-03-30 | 宝钢湛江钢铁有限公司 | Steel plate double-pre-stacking system for single-shear tangent line and stacking method thereof |
| CN112570984A (en) * | 2019-09-30 | 2021-03-30 | 宝钢湛江钢铁有限公司 | Multifunctional plate shearing device and method with functions of head cutting, segmenting and fixed-length shearing |
| CN116851932A (en) * | 2023-06-25 | 2023-10-10 | 广州市西克传感器有限公司 | Steel plate length measurement system based on grating |
| WO2024158582A1 (en) * | 2023-01-26 | 2024-08-02 | United States Gypsum Company | Non-contact encoder for board measurement |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109420795A (en) * | 2017-08-23 | 2019-03-05 | 宝山钢铁股份有限公司 | A kind of the first knife of slab head shearing positioning device and its control method |
| CN107971347A (en) * | 2017-10-20 | 2018-05-01 | 唐山中厚板材有限公司 | The thick online hot long method of survey of hot rolled plate in one kind |
| CN109596049A (en) * | 2018-12-28 | 2019-04-09 | 沈阳建筑大学 | A kind of hot steel plate end Shearing Optimization method after rolling |
| CN109740596A (en) * | 2018-12-28 | 2019-05-10 | 中冶京诚工程技术有限公司 | Intelligent video identification system and method for steel plate head cutting positioning |
| CN109596049B (en) * | 2018-12-28 | 2020-07-28 | 沈阳建筑大学 | Method for optimizing shearing of end part of hot steel plate after rolling |
| CN110434390A (en) * | 2019-07-19 | 2019-11-12 | 山东钢铁集团有限公司 | A kind of online scale automatic paragraphing cutting system of steel plate in irregular shape, method and shearing equipment |
| CN110434390B (en) * | 2019-07-19 | 2021-08-03 | 山东钢铁集团有限公司 | Online sizing intelligent segmented shearing system, method and shearing equipment for steel plates with irregular shapes |
| CN112570792A (en) * | 2019-09-30 | 2021-03-30 | 宝钢湛江钢铁有限公司 | Steel plate double-pre-stacking system for single-shear tangent line and stacking method thereof |
| CN112570984A (en) * | 2019-09-30 | 2021-03-30 | 宝钢湛江钢铁有限公司 | Multifunctional plate shearing device and method with functions of head cutting, segmenting and fixed-length shearing |
| WO2024158582A1 (en) * | 2023-01-26 | 2024-08-02 | United States Gypsum Company | Non-contact encoder for board measurement |
| CN116851932A (en) * | 2023-06-25 | 2023-10-10 | 广州市西克传感器有限公司 | Steel plate length measurement system based on grating |
| CN116851932B (en) * | 2023-06-25 | 2024-04-05 | 广东西克智能科技有限公司 | Steel plate length measurement system based on grating |
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Application publication date: 20150415 |