CN105478491A - Positioning method for positions of vibration mark defect of strip steel - Google Patents

Abstract

A positioning method for positions of a vibration mark defect of strip steel comprises the steps that (a) parameters are set initially, and the parameters comprise the length of the portions, between outlets of rolling mills and a drum type shear, of the strip belt, the pulse equivalent of a plate roller coder, and a vibration alarm reference value; (b) vibration signals of all the rolling mills, shearing signals, rolling reduction information of all the rolling mills, steel reel information, pulse signals of the plate roller coder are collected; (c) vibration energy values of all the rolling mills are calculated according to the vibration signals, the equivalent length of the strip steel between machine frames is calculated according to the rolling reduction information, and the number of accumulated pulses of the strip steel at the current moment is counted according to the pulse signals of the coder; (d) vibration alarm judgment is conducted; (e) the initial position and the end position of a vibration mark defect are recorded; and (f) vibration mark defect information is recorded and uploaded. By means of the positioning method, the positions of the strip steel defect caused by vibration of all the machine frames at any moment can be accurately calculated according to the plate roller coder information and the rolling reduction information of the rolling mills.

Description

A kind of localization method with steel vibration line defective locations

Technical field

The invention belongs to steel strip surface defect detection field in smelter band steel production process, be specifically related to a kind of localization method with steel vibration line defective locations.

Background technology

Rolling mill vibration is one of ubiquitous problem in the operation of rolling, serious problem is brought to production, the most outstanding performance is the surface vibration line caused by rolling mill vibration, even causes the fractures such as band steel, bring serious adverse effect to the continuity of producing and other aspects time serious.

Because rolling mill vibration occurrence cause is comparatively complicated, the expert of countries in the world and researcher are devoted to the research of rolling mill vibration, attempt the possible cause of reasonable dismissal rolling mill vibration and propose effectively to draw up vibration measure, but by up to the present, there is no special effective method or measure can fundamentally solve rolling mill vibration problem, maximum methods is used to be monitored rolling mill vibration situation by a set of rolling mill vibration monitoring system so far, by carrying out data analysis to the vibration signal monitored, judge the Vibration Condition of milling train, when rolling mill vibration value exceedes setting value, then report to the police, thus remind operating personnel to adopt corresponding measure to avoid causing batch production accident because of rolling mill vibration, but in band location, steel vibration failure position, the research that related personnel carries out is little.

Chinese patent CN103115668A discloses " the fault signature extracting method of milling train oscillation mark vibration signal and recognition methods ", it is the demodulation method based on second-order cyclic auto-correlation function, frequency demodulation is carried out to the oscillation mark vibration signal of non-stationary and carries out time domain section, improve the degree of accuracy that oscillation mark vibration signal fault signature extracts, and propose to adopt the form of power spectral information entropy to carry out alarm decision, the method for defective locations location is not proposed in patent.

Chinese patent CN201179527Y discloses a kind of tandem-mill strip-steel vibration marks monitoring warning device, by the acquisition process to signals such as rolling mill vibration, rotating speed, roller footpath, coil of strip information, realize the early warning that vibration line phenomenon is produced, but in patent, do not propose the method for accurately locating vibration failure position.

Chinese patent CN101450352A discloses a kind of band steel vibration marks detection method, it is by gathering the information such as rolling mill vibration, motor speed, coil of strip, by the process to vibration signal, and vibration alarming value compares, thus realizes the monitoring, alarming function of rolling mill vibration.Only can produce the coil of strip of vibration line according to coil of strip information searching, not propose effective vibration failure position Exact Location Method.

Therefore, be badly in need of a kind of localization method for band steel vibration line defective locations, not only to realize band steel vibration alarming function, accurate recording can also be carried out to vibration failure position, thus the inspection be conducive to steel defect, be conducive to accurately excising defect section simultaneously, avoid causing because of partial vibration line defect band steel entire volume to scrap and improve product lumber recovery simultaneously.

Summary of the invention

The object of this invention is to provide a kind of localization method with steel vibration line defective locations, solve the difficult problem cannot band steel vibration line defective locations accurately located, be recorded in prior art means.

For achieving the above object, technical scheme of the present invention is:

With a localization method for steel vibration line defective locations, it comprises the following steps:

A) parameter initialization setting, comprise milling train export to cylinder cut between strip length L ₀, template roller encoder pulse equivalency P _x, vibration alarming reference value G setting;

The pulse equivalency P of template roller encoder _xby the girth of this template roller and encoder week umber of pulse calculate, the band steel displacement namely on template roller roll surface representated by a pulse signal;

B) each rolling mill vibration signal X is gathered _i, shear signal, each rolling mill screwdown amount information, coil of strip information, template roller encoder pulse signal; Coil of strip information comprises reel number, steel grade, inlet thickness, exit thickness, strip width;

C) data processing is carried out to gathered vibration signal and drafts information, comprise the vibrational energy value H calculating each milling train according to the vibration signal gathered, calculate the band steel equivalent length l between each frame according to drafts information _i'; According to the accumulated pulse quantity N of encoder pulse signal to this coiled strip steel of current time _icount.

Rolling mill vibration energy value H refers to the root-mean-square value that the vibration signal after to process calculates, that is:

$H=\sqrt{\frac{\underset{i=0}{\overset{n}{\mathrm{\Σ}}}{\left(X_i^{\′}\right)}^2}{n}}$

Wherein, n is signal collected number of signals strong point number.

Band steel equivalent length l between each frame _i' refer to that from when forebay is to the strip length of band steel after rolling completes of next frame, wherein i represents shelf number.According to constancy of volume principle in the operation of rolling, l can be known _idh=l _i' d ' h ', because strip width does not change in the operation of rolling, that is:

$I_i^{\′}=\frac{l_{i}h}{h^{\′}}=\frac{l_i}{1-\mathrm{\η}},$

Wherein, l _i, d, h be respectively strip length, width, thickness before rolling;

L _i', d ', h ' be respectively strip length, width, thickness after rolling;

η is the relative reduction of rolling front and back band steel thickness;

Accumulated pulse quantity Ni refers to current coiled strip steel after last time, shear signal sent to working as

Time front, stereotyping roller encoder adds up the number of pulses sent.

D) vibration alarming judges

By carrying out real-time comparison to vibrational energy value and warning reference value, when vibrational energy value H exceeding warning reference value G, thinking that the vibration of current level can cause defect to belt steel surface, sending vibration alarming information alert simultaneously;

E) record vibration line defect original position, end position

According to obtained vibration alarming information, if certain frame at a time vibrate occur to report to the police and and previous moment is reported to the police, then think to be in band steel position in this frame roll gap for vibration line defect original position; In like manner, if this frame is at a time vibrated and do not occurred to report to the police and previous moment is reported to the police, then think and be in band steel position in this frame roll gap for vibrating line defect end position;

Certain frame at a time vibrates caused vibration line defect more specific location information by following formulae discovery, that is:

L _i＝L ₀+l′+S＝L ₀+l′+N _iP _x

Wherein, L ₀for milling train exports to the strip length between band steel cutter;

The band steel equivalent length that l ' exports to milling train for this frame, for this frame exports band steel equivalent length l between each frame to milling train _i' sum;

S is the accumulative rolling distance after band steel self cleavage, S=N _ip _x;

N _ifor current time encoder accumulated pulse quantity;

F) vibrate line defect information record and upload

In the generating process once vibrated, may multiple frame all can vibrate simultaneously, in addition in same coil of strip, also more than twice vibration may be there is, therefore may obtain, between a series of vibration failure lane place, merging the overlapping region of its vibration failure position, obtain some sections of discrete defective locations information, its information record is uploaded with coil of strip information package, is convenient to lower road unit and carries out defect inspection.

Further, as milling train does not configure template roller encoder, then encoder is set by (comprising guide roller, top pinch roll) on other rollers or uses other equipment such as note rice wheel, horizontal metroscope also can obtain similar strip length information.

In the methods of the invention:

Described step a) in the setting of warning reference value G need in conjunction with the actual vibration energy value of milling train and carry out reasonable set by the result of determination of reviewer to band steel vibration line defect, its numerical value is in time vibrating line defect and produce and between rolling mill vibration energy value corresponding respectively when not producing.

Described step b) in rolling mill vibration signal, gather rolling mill vibration signal by the acceleration transducer installed in mill housing plan vertical direction.

Described step b) in shear signal as the cut-point of coil of strip, stored as a file according to carrying out zero setting to the count value of encoder pulse signal simultaneously.

Described step b) in each rolling mill screwdown amount information can directly obtain from mill control system.

Described step b) in coil of strip information come from the on-the-spot creation data issued, can directly call.

The invention has the beneficial effects as follows:

1. the present invention is by template roller encoder information and rolling mill screwdown amount information, thus realizes the accurate calculating of steel defect position corresponding to any time each frame, solves the difficult problem cannot carrying out accurately location in prior art means with vibration line defective locations.

2., by the record of vibration line defective locations information with upload, can process existence vibration line defect coil of strip as early as possible according to vibration line defect length information, avoid defective coil flow into lower road unit or come into the market.

3. pass through recorded vibration line defective locations information, range check targetedly can be carried out to band steel, thus reduce workload.

4. pass through recorded vibration line defective locations information, can excise existing defects section according to defective locations information after the uncoiling of band steel, thus avoid being with the entire volume of steel to seal up for safekeeping.

Accompanying drawing explanation

Fig. 1 is vibration line defective locations localization method flow chart.

Fig. 2 is the strip length schematic diagram that in the present embodiment, milling train and milling train export each region.

Detailed description of the invention

See Fig. 1, Fig. 2, below for the product line deployment scenarios of 1,730 five tandem mills, the inventive method is specifically described.

Five tandem mills comprise No. one ~ No. five frame 1# ~ 5#, and No. five frame 5# outlets set gradually template roller 1, pinch roll 2, coil of strip cutter 3, coiling machine 4.

A, set and export to strip length L between coil of strip cutter from No. five milling trains ₀, set the strip length L between each frame ₁₂, L ₂₃, L ₃₄, L ₄₅, setting vibration alarming reference value, setting template roller encoder pulse equivalent P _x;

$P_x=\frac{\mathrm{\πD}}{P},$

Wherein, D is template roller diameter; P is template roller encoder resolution;

L in described steps A ₀=L ₁+ L ₂+ L ₃, comprise three parts, be respectively the distance L between five rack outlet to template roller 1 ₁, the distance L between template roller 1 to pinch roll 2 ₂, the distance L between pinch roll 2 to coil of strip cutter 3 (cylinder is cut) ₃, as shown in Figure 2;

B, collection vibration signal, shear signal, rolling mill screwdown amount information, coil of strip information, template roller encoder pulse signal;

Vibration signal in described step B is used for rolling mill vibration alarm decision; Shear signal as the separation of file data, simultaneously by the zero setting of encoder pulse signal-count value; Coil of strip information is used for file and stores and display; Rolling mill screwdown amount information and template roller encoder pulse signal are used for location, steel defect position;

C, calculate the vibrational energy value of each frame according to the computational methods of vibrational energy value, count according to encoder pulse signal paired pulses quantity, calculate the equivalent strip length l ' between four, five frames according to drafts information ₄₅:

$l_{45}^{\′}=\frac{l_{45}}{1-{\mathrm{\η}}_5};$

In like manner, the equivalent strip length between each frame is calculated:

$l_{34}^{\′}=\frac{l_{34}}{(1-{\mathrm{\η}}_4)(1-{\mathrm{\η}}_5)},l_{23}^{\′}=\frac{l_{23}}{(1-{\mathrm{\η}}_3)(1-{\mathrm{\η}}_4)(1-{\mathrm{\η}}_5)},l_{12}^{\′}=\frac{l_{12}}{(1-{\mathrm{\η}}_2)(1-{\mathrm{\η}}_3)(1-{\mathrm{\η}}_4)(1-{\mathrm{\η}}_5)},$

Wherein l ₁₂, l ₂₃, l ₃₄, l ₄₅be respectively one, two frames, two, three frames, three, four frames, the strip length between four, five frames, l ' ₁₂, l ' ₂₃, l ' ₃₄, l ' ₄₅be respectively one, two frames, two, three frames, three, four frames, the equivalent strip length between four, five frames, η ₂, η ₃, η ₄, η ₅be respectively the drafts of No. two, No. three, No. four, No. five milling trains;

D, vibration alarming judge

By carrying out real-time comparison to vibrational energy value and warning reference value, when vibrational energy value exceeding warning reference value, thinking that the vibration of current level can cause defect to belt steel surface, sending vibration alarming information alert simultaneously;

E, vibration alarming occur time, record occur vibration shelf number and vibration alarming initial with at the end of template roller encoder to count value N _a, N _b, band steel vibration line defect original position L _a=L ₀+ l '+N _ap _x, end position L _b=L ₀+ l '+N _bp _x;

Wherein l ' is for being with steel equivalent length between milling train, and according to the shelf number that vibration occurs, its length equals the band steel equivalent length sum between occurred vibration frame to each frame of five frames, occurs in three frames to vibrate:

$l^{\′}=l_{34}^{\′}+l_{45}^{\′}=\frac{l_{34}}{(1-{\mathrm{\η}}_4)(1-{\mathrm{\η}}_5)}+\frac{l_{45}}{1-{\mathrm{\η}}_5};$

F, vibration line defect information record and uploading

In a vibration processes, the multiple frame of possibility all can be affected and also vibrate, and in addition in same coil of strip, more than twice vibration also may occur, therefore may obtain (l between a series of vibration failure lane place _a1, l _b1), (l _a2, l _b2) ..., merge between its vibration failure lane place, finally obtain some sections of defective locations information, its information record is together uploaded with coil of strip number, is convenient to lower road unit and carries out defect inspection.

Claims (2)

1. the localization method with steel vibration line defective locations, is characterized in that, comprise the following steps:

A) parameter initialization setting, comprise milling train export to cylinder cut between strip length L ₀, template roller encoder pulse equivalency P _x, vibration alarming reference value G setting;

The pulse equivalency P of template roller encoder _xby the girth of this template roller and encoder week umber of pulse calculate, the band steel displacement namely on template roller roll surface representated by a pulse signal;

B) each rolling mill vibration signal X is gathered _i, shear signal, each rolling mill screwdown amount information, coil of strip information, template roller encoder pulse signal; Coil of strip information comprises reel number, steel grade, inlet thickness, exit thickness, strip width;

C) data processing is carried out to gathered vibration signal and drafts information, comprise the vibrational energy value H calculating each milling train according to the vibration signal gathered, calculate the band steel equivalent length l ' between each frame according to drafts information _i; According to the accumulated pulse quantity N of encoder pulse signal to this coiled strip steel of current time _icount.

Rolling mill vibration energy value H refers to the root-mean-square value that the vibration signal after to process calculates, that is:

$H=\sqrt{\frac{\underset{i=0}{\overset{n}{\mathrm{\Σ}}}{\left(X_i^{\′}\right)}^2}{n}}$

Wherein, n is signal collected number of signals strong point number.

Band steel equivalent length l ' between each frame _irefer to that from when forebay is to the strip length of band steel after rolling completes of next frame, wherein i represents shelf number.According to constancy of volume principle in the operation of rolling, l can be known _idh=l ' _id ' h ', because strip width does not change in the operation of rolling, that is:

$l_i^{\′}=\frac{l_{i}h}{h^{\′}}=\frac{l_i}{1-\mathrm{\η}},$

Wherein, l _i, d, h be respectively strip length, width, thickness before rolling;

L ' _i, d ', h ' be respectively strip length, width, thickness after rolling;

η is the relative reduction of rolling front and back band steel thickness;

Accumulated pulse quantity N _irefer to that current coiled strip steel adds up the number of pulses sent after last time, shear signal sent to current time template roller encoder.

D) vibration alarming judges

By carrying out real-time comparison to vibrational energy value and warning reference value, when vibrational energy value H exceeding warning reference value G, thinking that the vibration of current level can cause defect to belt steel surface, sending vibration alarming information alert simultaneously;

E) record vibration line defect original position, end position

According to obtained vibration alarming information, if certain frame at a time vibrate occur to report to the police and and previous moment is reported to the police, then think to be in band steel position in this frame roll gap for vibration line defect original position; In like manner, if this frame is at a time vibrated and do not occurred to report to the police and previous moment is reported to the police, then think and be in band steel position in this frame roll gap for vibrating line defect end position;

Certain frame at a time vibrates caused vibration line defect more specific location information by following formulae discovery, that is:

L _i＝L ₀+l′+S＝L ₀+l′+N _iP _x

Wherein L ₀for milling train exports to the strip length between band steel cutter;

The band steel equivalent length that l ' exports to milling train for this frame, for this frame exports band steel equivalent length l between each frame to milling train _i' sum;

S is the accumulative rolling distance after band steel self cleavage, S=N _ip _x;

N _ifor current time encoder accumulated pulse quantity;

P _xfor encoder pulse equivalent.

F) vibrate line defect information record and upload

In the generating process once vibrated, may multiple frame all can vibrate simultaneously, in addition in same coil of strip, also more than twice vibration may be there is, therefore may obtain, between a series of vibration failure lane place, merging the overlapping region of its vibration failure position, obtain some sections of discrete defective locations information, its information record is uploaded with coil of strip information package, is convenient to lower road unit and carries out defect inspection.

2. the localization method of band steel vibration line defective locations as claimed in claim 1, it is characterized in that, as milling train does not configure template roller encoder, then by arranging encoder or use note rice wheel or horizontal metroscope also can obtain similar strip length information on guide roller or top pinch roll.