CN114111649A - Flatness measuring method, flatness measuring device, electronic apparatus, and storage medium - Google Patents
Flatness measuring method, flatness measuring device, electronic apparatus, and storage medium Download PDFInfo
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- CN114111649A CN114111649A CN202111403487.4A CN202111403487A CN114111649A CN 114111649 A CN114111649 A CN 114111649A CN 202111403487 A CN202111403487 A CN 202111403487A CN 114111649 A CN114111649 A CN 114111649A
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- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/30—Measuring arrangements characterised by the use of optical techniques for measuring roughness or irregularity of surfaces
Abstract
The application provides a flatness measuring method, a flatness measuring device, electronic equipment and a storage medium, wherein the method comprises the steps of obtaining height values of a plurality of position points of an object to be measured in motion; calculating the height value to obtain a first straightness of the plurality of position points; and processing the first straightness of the plurality of position points to obtain the target straightness of the object to be measured. The method comprises the steps that a plurality of groups of laser three-point measuring modules based on a triangulation method are adopted to dynamically measure height values of a plurality of position points on the surface of an object to be measured, the motion length is calculated by combining the motion speed of the object to be measured, and a first flatness index and a target flatness index which can reflect the surface flatness defect of the object to be measured are calculated by integrating a plurality of motion lengths; meanwhile, the flatness defect type of the object to be detected can be comprehensively judged according to the first flatness fitting polynomial of the plurality of position points; the flatness measuring method improves the precision and accuracy of flatness measuring results, and has the capability of continuous, online, real-time and automatic measurement.
Description
Technical Field
The application relates to the technical field of flatness detection, in particular to a flatness measuring method and device, electronic equipment and a storage medium.
Background
In industrial production, the quality of rolled sheet metal strip is often measured by its various parameters of shape, dimensions, surface quality, mechanical properties, etc., where flatness is an important indicator of shape control. Since flatness, which is the least easily controllable indicator of the quality of a rolled sheet metal strip, will directly affect the yield and subsequent processing of the rolled sheet metal strip, the flatness value of a sheet strip is usually used as an input signal for a feedback control system for sheet strip rolling to improve rolling quality.
At present, the flatness detection technology is developed towards the online real-time direction, and the flatness detection is generally carried out by a plurality of methods such as a tension method, an electromagnetic method, an optical method, a sound wave method and the like, wherein the optical method is most widely applied, but because the plate and strip materials are twisted and swung in the rolling process, the conventional optical measurement method is extremely easy to interfere under the complex condition, and the final measurement result cannot really reflect the real flatness defect.
Disclosure of Invention
In view of the above, an object of the embodiments of the present application is to provide a flatness measuring method, a flatness measuring apparatus, an electronic device, and a storage medium. By reducing the measurement error, the precision of the measurement result is improved, and the problem that the real flatness defect cannot be truly reflected is solved.
In a first aspect, an embodiment of the present application provides a flatness measuring method, including: acquiring height values of a plurality of position points of an object to be detected in motion; calculating the height value to obtain a first straightness of the plurality of position points; and processing the first straightness of the plurality of position points to obtain the target straightness of the object to be measured.
In the implementation process, the first flatness is calculated through measuring the height value and a series of calculations, the target flatness reflecting the whole defects of the surface of the object to be measured can be calculated according to the first flatness, the final flatness index capable of reflecting the real defects of the surface of the object to be measured can be comprehensively judged according to the basic flatness index fitting of a plurality of position points, the measurement errors caused by flying, floating and twisting in the motion process of the object to be measured are reduced, the precision and the accuracy of the measurement result are improved, and meanwhile, the measurement method has the continuous, on-line, real-time and automatic measurement capabilities.
With reference to the first aspect, an embodiment of the present application provides a first possible implementation manner of the first aspect, where: the acquiring height values of a plurality of position points of an object to be measured in motion comprises: irradiating a plurality of position points of an object to be measured in motion by adopting a plurality of groups of laser three-point measuring modules so as to obtain a plurality of light spots corresponding to the position points; and determining the height values of the plurality of position points according to the plurality of light spots based on a light spot imaging theory.
In the implementation process, the height values of a plurality of position points are measured simultaneously based on a plurality of groups of laser three-point measuring modules, so that the height value of the object to be measured is determined based on a non-contact optical triangulation method and a facula imaging theory; the measuring position variation error introduced when the object to be measured is uneven such as inclined and wavy is reduced; three laser beams are adopted for measurement, the vertical heights of three different parts of the surface of the object to be measured can be measured simultaneously, and the change of the surface radian among three measuring points can be reflected. The laser three-point measuring module is used as an independent measuring unit, is easy to install on site and replace spare parts, and can be flexibly arranged and combined according to measuring requirements.
With reference to the first possible implementation manner of the first aspect, an embodiment of the present application provides a second possible implementation manner of the first aspect, where: the calculating the height value to obtain a first straightness of the plurality of position points includes: calculating the height value and the movement speed of the object to be detected to obtain the movement lengths of the object to be detected at the plurality of position points; and calculating the movement length to obtain a first straightness of the plurality of position points.
In the implementation process, the movement lengths of the position points are calculated according to the height values obtained by measurement and the movement speed, the first straightness of each position point is calculated according to the movement lengths, the length measurement and the basic straightness index measurement of each position covering the center and two sides of the surface of the object to be measured in the width direction are realized, and the basic surface condition of the object to be measured is reflected.
With reference to the first possible implementation manner of the first aspect, an embodiment of the present application provides a third possible implementation manner of the first aspect, where: the calculating the height value and the movement speed of the object to be measured to obtain the movement lengths of the object to be measured at the plurality of position points includes: calculating according to the height value of the jth position and the movement speed of the object to be detected to obtain the jth sub-movement length of the object to be detected between the jth moment and the jth +1 moment, wherein j is a positive integer which is greater than or equal to one and less than or equal to i-1, i is the total number of the obtained height values, and the height value of the jth position is the height value measured at the jth moment; and calculating the movement lengths of the object to be measured at the plurality of position points according to the sub-movement lengths from the first time to the ith time.
In the implementation process, j height values are measured, j sub-movement lengths are calculated, the movement lengths of a plurality of position points are obtained according to the j sub-movement lengths, the dynamic measurement of the surface height of the object to be measured by a laser three-point measurement module based on a triangulation method is realized, the movement lengths of the object to be measured at each position point on the surface are calculated by combining the movement speeds of the object to be measured, and the basic straightness index is obtained by integrating the lengths; the laser dynamic measurement process is subdivided, so that the data volume is increased, the calculation error caused by less data volume is avoided, and the precision of measurement and calculation results is improved.
With reference to the first possible implementation manner of the first aspect, an embodiment of the present application provides a fourth possible implementation manner of the first aspect, where: the calculating the height value and the movement speed of the object to be measured to obtain the movement lengths of the object to be measured at the plurality of position points includes: filtering the height values corresponding to the plurality of position points to obtain filtered height values; and calculating the filtering height value and the movement speed of the object to be detected to obtain the movement lengths of the object to be detected at the plurality of position points.
In the implementation process, by filtering the measured height value, when the laser three-point measuring module measures the height, the high-frequency change of the height measurement result caused by several or more conditions such as deviation possibly caused by foreign matters such as iron scales on the surface of an object to be measured, error possibly caused by water drops splashed in a measuring light path, measurement error caused by each measurement operation, error generated by the change of the height of the surface of the object to be measured and the like is reduced, and further, the phenomenon that the calculated movement length and the first straightness have larger deviation is avoided.
With reference to the first possible implementation manner of the first aspect, an embodiment of the present application provides a fifth possible implementation manner of the first aspect, where: the processing the first flatness of the plurality of location points to obtain a target flatness includes: fitting the first straightness of the plurality of position points to obtain a first polynomial; normalizing the first polynomial to obtain a second polynomial; and performing data conversion on the second polynomial to obtain the target straightness of the object to be detected in motion.
In the implementation process, a polynomial which is approximate to the change of the elongation rate on the width curve of the object to be measured is fitted by fitting the first flatness indexes of the object to be measured at a plurality of different width positions, so that the flatness defect of the surface of the object to be measured is quantitatively reflected in the form of a mathematical curve, the method is more visual and clear, the height value is measured in real time, the dynamic change of the first flatness is observed in real time, and the continuous, online, real-time and automatic measurement capability of the scheme is improved; furthermore, the polynomial is normalized, so that the comprehension and comparison of the polynomial coefficients of the straightness curve are facilitated; the normalized polynomial is subjected to data conversion, so that the elongation percentage of objects to be measured with different specifications at different relative positions can be compared, and the capability of the measurement index of the scheme for truly reflecting the flatness defect is improved.
With reference to the first possible implementation manner of the first aspect, an embodiment of the present application provides a sixth possible implementation manner of the first aspect, where: the fitting the first straightness of the plurality of position points to obtain a first polynomial includes: fitting a first flatness of a plurality of location points of a first location area of the plurality of location points to obtain the first polynomial for the first location area; fitting a first flatness of a plurality of location points of a second location area of the plurality of location points to obtain the first polynomial for the second location area; fitting a first flatness of a plurality of location points of a third location area of the plurality of location points to obtain the first polynomial of the third location area; the method further comprises the following steps: determining the flatness defect type of the object to be measured according to the first polynomial, the first polynomial of the first position region, the first polynomial of the second position region and the first polynomial of the third position region.
In the implementation process, the flatness defect types can be judged by the fitting polynomial of the first flatness of the surface regions in different positions and the fitting polynomial of the first flatness of the whole region, the advantages that different characteristics of the extension rate distribution curve function can reflect different flatness defects of the surface of the object to be measured are fully utilized, and the accuracy and the high efficiency of the scheme in the aspect of measuring the flatness are improved.
In a second aspect, an embodiment of the present application further provides a flatness measuring apparatus, including: the first measurement module is used for acquiring height values of a plurality of position points of an object to be measured in motion; the calculation module is used for calculating the height value to obtain a first straightness of the plurality of position points; and the processing module is used for processing the first straightness of the plurality of position points to obtain the target straightness of the object to be detected.
In the implementation process, the flatness measuring device comprises a first measuring module, a calculating module, a processing module and the like. The first measurement module can acquire height values of a plurality of position points of an object to be measured in motion; the calculation module can calculate the height value to obtain a first straightness of the plurality of position points; and the processing module can process the first straightness of the plurality of position points to obtain the target straightness of the object to be detected.
In a third aspect, an embodiment of the present application further provides an electronic device, including: a processor, a memory storing machine-readable instructions executable by the processor, the machine-readable instructions, when executed by the processor, performing the steps of the method of the first aspect described above, or any possible implementation of the first aspect, when the electronic device is run.
In a fourth aspect, an embodiment of the present application further provides a computer-readable storage medium, including: the computer-readable storage medium has stored thereon a computer program which, when being executed by a processor, performs the steps of the flatness measuring method of the first aspect described above, or any one of the possible implementations of the first aspect.
The embodiment of the application provides a flatness measuring method and device, electronic equipment and a storage medium. The method comprises the steps of dynamically measuring the heights of a plurality of position points on the surface of an object to be measured by a laser three-point measuring module based on a triangulation method, calculating the movement length of the object to be measured at each position point on the surface by using the measured height values and the movement speed, calculating a first straightness index by integrating the length values, and fitting, normalizing and converting the first straightness of the plurality of position points to obtain the target straightness of the surface of the object to be measured, wherein the target straightness can represent the straightness defects of a plurality of relative positions. Meanwhile, the type judgment of the flatness defects can be realized. The scheme not only eliminates the measurement errors caused by various conditions such as flying, floating and twisting, but also can reflect the change of flatness indexes in real time by utilizing a mathematical curve, improves the accuracy of measurement results, and has continuous, online, real-time and automatic measurement capabilities.
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.
FIG. 1 is a flow chart of a flatness measuring method provided in an embodiment of the present application;
fig. 2 is a flowchart for obtaining a height value according to an embodiment of the present application;
FIG. 3 is an optical layout for height measurement according to an embodiment of the present application;
fig. 4 is a flowchart of calculating a first flatness according to an embodiment of the present application;
FIG. 5 is a flow chart of calculating a target flatness provided by an embodiment of the present application;
FIG. 6 is a flowchart illustrating flatness defect type determination provided in an embodiment of the present application;
FIG. 7 illustrates a common flatness defect type provided by an embodiment of the present application;
FIG. 8 is a functional block diagram of a flatness measuring apparatus according to an embodiment of the present disclosure;
fig. 9 is a block diagram of an electronic device according to an embodiment of the present application.
Icon: 10-laser three-point measuring module; 11-a laser; 12-a photoelectric receiver; 210-a first measurement module; 220-a calculation module; 230-a processing module; 300-an electronic device; 311-a memory; 312 — a storage controller; 313-a processor; 314-peripheral interfaces; 315-input-output unit; 316-display unit.
Detailed Description
The technical solution in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. Meanwhile, in the description of the present application, the terms "first", "second", and the like are used only for distinguishing the description, and are not to be construed as indicating or implying relative importance.
The inventor of the application notices that the flatness detection device used in China at present mostly depends on import, is high in cost, needs to consume a large amount of time for maintenance and overhaul, and mostly cannot be installed and used on site, so that the development of steel enterprises in China is greatly limited. The key technical method for mastering the flatness detection fills up the technical blank, and the development of the flatness detection device with independent intellectual property rights is an urgent need. The ease of flatness measurement in rolling sheet metal strip depends on the operating conditions of the rolling mill, particularly thin sheet strip below 2mm, which tends to fly, float and twist, and conventional optical measurement methods are highly susceptible to interference under such complex conditions, thereby amplifying flatness defects.
Based on the research, the embodiment of the application provides a flatness measuring method, which reduces measuring errors, further improves the precision of measuring results, and solves the problem that the real flatness defect cannot be truly reflected. This is described below by means of several examples.
Please refer to fig. 1, which is a flowchart illustrating a flatness measuring method according to an embodiment of the present disclosure. The specific process shown in FIG. 1 will be described in detail below.
Step 100: acquiring height values of a plurality of position points of an object to be detected in motion;
for example, the object to be measured may be a rectangular cross-section metal plate strip with a large width-to-thickness ratio. The thinnest foil of the plate and strip produced by the rolling method is only 0.001mm, the thickest plate is about 300mm, the narrowest width is 1mm, and the widest width reaches 5300 mm; the plate and strip materials are classified according to steel grades and nonferrous metal grades, and are also generally classified according to sizes, and the steel plate with the thickness of more than 4mm is called a medium plate; and (3) weighing a single sheet of cold-rolled and hot-rolled plate strips with the thickness of 0.1-4 mm as a thin plate, and weighing a coiled strip steel. The scheme takes the coiled strip steel as an example.
The strip steel can be a steel plate with thin thickness, narrow width and long length produced by a hot rolling mill, the hot rolling mill can comprise a finishing mill, and the rolling production size of the strip steel can be determined by the length of a working roll body of the finishing mill.
The rolling process of the strip steel can be as follows: firstly, raising the temperature to the required rolling temperature in a heating furnace; then, the steel enters a rough rolling dephosphorizing machine through a roller way of a rolling machine to treat iron scales generated on the surface; then, the strip steel enters a rough rolling unit to roll the width and the thickness of the strip steel; then the steel strip is conveyed to a fine rolling dephosphorizing machine by a roller way, and after iron oxide scales generated on the surface of the steel strip are processed, the steel strip enters a fine rolling mill group to perform more precise rolling on the thickness and the width of the steel strip; finally, the strip steel is subjected to surface temperature treatment by layer cooling through a roller way, and then enters a coiling machine to be coiled into the strip steel of the steel coil. Therefore, the rolling process can be mainly divided into two motion processes of rough rolling and finish rolling.
And acquiring the height values of a plurality of position points of the object to be detected. Further, in the rolling process, the height values of a plurality of different position points in the width direction of the surface of the strip steel are measured, and the height values are obtained. The height measurement range can be specifically determined according to the steel plate shaking range of a production line in the rolling process of rough rolling, finish rolling and the like, is generally 350mm, and can be expressed as minus 30mm to plus 320mm of a roller path line. The speed of the front pinch roll and the speed of the rear pinch roll are asynchronous in the rolling process, so that the steel coil at a certain position can be bent and protruded, the influence of the abnormal condition of the steel coil on the measuring equipment is reduced, the safety of the measuring equipment is ensured, and the distance between the measuring equipment and the roller surface is generally more than 2 meters.
The position point can be any position on the surface of the object to be measured. Furthermore, the defects of the integral flatness of the surface of the strip steel are detected, and a plurality of position points on the center side and the two sides of the width direction of the surface of the strip steel can be selected as target position points for measurement.
Step 110: calculating the height value to obtain a first straightness of the plurality of position points;
illustratively, a series of calculations are performed on a plurality of height values obtained by measuring a plurality of position points on the surface of the object to be lateral, and finally, a first straightness of a plurality of positions related to a specific physical position (for example, a position 300mm in the width direction) of the surface of the object to be lateral can be obtained.
Further, the first flatness may be an elongation of a single location of the surface of the strip. The surface of the strip steel can be regarded as a structure formed by a plurality of single fiber strips. Individual sliver lengths cannot indicate flatness defects and comparison of multiple parallel sliver lengths can contain or reflect true information of flatness defects, thus measuring the height values of multiple location points to obtain a first flatness of multiple specific physical locations, thereby enabling definition of multiple different flatness indices to quantify flatness defect information.
The elongation may be defined as the ratio of the length change of the other fiber strands relative to the central fiber strand or the shortest fiber strand, i.e. as a dimensionless value, and the elongation may be expressed as Roi-cOr Roi-sThe calculation method can be expressed as the following formula:
Wherein L isiIs the length of the sliver at the i-th position, LcIs the length of the central fiber strand, LsIs the length of the shortest fiber strand. It can be seen that: the reference fiber can be the central fiber or the shortest fiber; the elongation of the reference fiber is always 0, and when the shortest fiber is used as the reference fiber, the other elongation indicators are all positive.
Step 120: and processing the first straightness of the plurality of position points to obtain the target straightness of the object to be measured.
Illustratively, the target flatness may be an elongation calculated from a first flatness fitting polynomial at a plurality of specific physical locations, and may represent an elongation with respect to a location of the surface of the strip, for example, the target flatness may be represented as an elongation at 1/4 locations along the width of the strip.
Please refer to fig. 2, which is a flowchart illustrating a process of obtaining a height value according to an embodiment of the present disclosure. The specific process shown in fig. 2 will be described in detail below.
For example, obtaining the height values of the plurality of position points generally includes illuminating the plurality of position points on the surface of the object to be measured, forming a plurality of light spots, transmitting the light spots on an imaging interface, obtaining an imaging displacement corresponding to the movement of the light spots on the imaging interface, and calculating the height values of the plurality of position points based on an optical imaging theory.
Specifically, step 100 may include step 101 and step 102.
Step 101: irradiating a plurality of position points of an object to be measured in motion by adopting a plurality of groups of laser three-point measuring modules 10 to obtain a plurality of light spots corresponding to the position points;
the height measurement may be, for example, based on non-contact optical triangulation using a laser three-point measuring module 10 of a three-laser-beam measuring configuration as the primary measuring device.
The laser three-point measurement module 10 may have three point lasers 11 built therein, or may have a linear laser 11, and the laser beam pitch may be 35mm, or may have any other pitch value. Wherein, the laser 11 is used as a light source of the measuring device, and the laser 11 may be at least one of a helium-neon laser 11, a green solid laser 11, a semiconductor laser 11, and the like.
Optionally, the laser 11 is a semiconductor laser 11 with long service life, stable power and large working temperature range, for the convenience of debugging, the visible light type semiconductor laser 11 with an output wavelength of 450nm may be selected, and the output power may reach 80 mW. The temperature of the strip steel is generally high in the hot rolling process, and the visible light type semiconductor laser 11 can achieve good contrast with a high-temperature object to be measured. The photoelectric receiver 12 may adopt a high-speed linear CMOS device, which realizes higher height measurement accuracy and faster measurement speed, for example, the measurement accuracy may be 0.1mm, and the measurement speed may be as high as 1000 times/s.
The laser three-point measuring module 10 adopts an integrated box body design, and a main structure adopts a U-shaped aluminum alloy groove. All components are arranged on the back plate of the U-shaped groove, the relative positions are fixed and are not easy to change, and the measurement stability of long-term operation is ensured. The U-shaped aluminum alloy groove back plate and the bottom plate are provided with water channels, so that cold water can be prepared to keep the temperature stable, and the influence of the thermal shrinkage effect of the metal material on the measurement precision is reduced. The three lasers 11 are arranged on the back plate of the measuring box body at equal intervals, and the adjusting mechanism is arranged to ensure that the emitted laser beams are parallel and on the same plane and are perpendicular to the bottom plate of the measuring box body. The photoelectric receiver 12 is arranged on the same plane vertical to the bottom plate of the measuring box body, so that the photoelectric receiver is convenient to install and adjust.
Specifically, as shown in fig. 3, it is a height value measurement optical layout provided in the embodiment of the present application. Three identical lasers 11 in the laser three-point measurement module 10 are arranged on the same plane at equal intervals and used as a measurement plane; the photoelectric receiver 12 is arranged on the measurement plane; the measuring plane is perpendicular to the bottom plate of the laser three-point measuring module 10; the Y direction is the longitudinal direction.
In one embodiment, nine sets of laser three-point measurement modules 10 are placed over the object to be measured at different locations while illuminating those locations to perform measurements. The nine groups of laser three-point measurement modules 10 emit light to be incident on the surface of an object to be measured to form light spots, the position change of the surface of the object to be measured causes the incident light spots to move along the incident optical axis, and the light spots can be imaged on the CCD photosensitive surface through the receiving lens. Because the facula point is in one-to-one correspondence with the imaging point on the CCD imaging surface, the moving track of the surface of the object to be measured can be obtained by observing the displacement of the CCD plane imaging point.
Step 102: and determining the height values of the plurality of position points according to the plurality of light spots based on a light spot imaging theory.
For example, when the laser triangulation is used for measuring the height, the multiple sets of laser three-point measuring modules 10 may irradiate vertically or obliquely. Optionally, the laser 11 is vertical irradiation, an included angle between the emission axis of the laser 11 and the receiving optical axis may be set to 45 °, and a linear distance between the laser 11 and the receiving device imaging surface may exceed 2 meters, so as to improve the measurement accuracy.
Further, based on the spot imaging theory, the optical system can be represented by defining the following relation:
wherein θ is an included angle between the emitting axis of the laser 11 and the receiving optical axis, f is a focal length of the receiving lens, l is an object distance, n is a displacement of an imaging point on a CCD imaging surface, h is a movement displacement of a light spot point in a vertical direction of an object to be measured, i.e., a height value of the object to be measured, and the visible measurement height value h and the imaging displacement n have a monotonic and nonlinear relationship, which can be expressed as f (n).
Through laser vertical incidence, the measurement position change error caused by the steel strip with unevenness such as inclination and wave can be reduced, each laser three-point measurement module 10 adopts three laser beams for measurement, the vertical heights of three different parts on the surface of the steel strip can be measured at one time, and the change of the surface radian among three measurement points can be reflected.
Please refer to fig. 4, which is a flowchart illustrating a first flatness calculation according to an embodiment of the present application. The specific flow shown in fig. 4 will be described in detail below.
Optionally, step 110 may include step 113 and step 115.
Step 113: calculating the height value and the movement speed of the object to be detected to obtain the movement lengths of the object to be detected at the plurality of position points;
for example, after the height values of the plurality of position points are obtained by measuring the plurality of position points of the object to be measured, the movement lengths of the plurality of position points are further calculated and converted. Alternatively, the movement length can be the length of the fiber strips on the surface of the strip steel, and the movement speed can be the conveying speed of a roller way of the strip steel rolling machine. The length of the strip steel fiber strip can be obtained by continuously measuring the height value of the strip steel through a plurality of groups of laser three-point measuring modules 10 and calculating by combining the conveying speed of a strip steel roller way.
In one embodiment, as shown in FIG. 3, each set of laser three-point measurement modules 10 measures the fiber strip length of the strip surface at the nine points. Three laser three-point measuring modules 10 are fixedly arranged at the central side of the strip steel to measure the lengths of three fiber strips. If the width of the strip steel is W, the position of the strip steel center line can be represented as the position of W being 0, the measurement center line is aligned with the roller way center line, and the length of the fiber strip obtained by the measurement of the laser three-point measurement module 10 placed at the center line position can be used as the reference fiber length.
Furthermore, three groups of laser three-point measuring modules 10 are respectively arranged at two sides of the strip steel, and the lengths of three fiber strips at the edge part are respectively measured. Because the strip edge can be a wavy edge, the defect amplitude of the strip edge is larger, so the measuring positions at two sides of the strip can be moved to be as close to the strip edge as possible, and particularly, the W/2 position can be 100 mm close to the edge.
Wherein step 113 may include step 113a and step 113 b.
Step 113 a: and calculating according to the height value of the jth position and the movement speed of the object to be detected to obtain the jth sub-movement length of the object to be detected between the jth moment and the jth +1 moment.
Wherein j is a positive integer which is greater than or equal to one and less than or equal to i-1, wherein i is the total number of terms of the obtained height value, and the height value of the jth position is the height value measured at the jth moment.
Step 113 b: and calculating the movement lengths of the object to be measured at the plurality of position points according to the sub-movement lengths from the first time to the ith time.
Illustratively, when the object to be measured passes through the measuring plane, the laser three-point measuring module 10 measures a height value at regular intervals, and a series of height values can be obtained, where i height values can be respectively represented as h1,h2…hj…hiThe height value of the jth position is the height value measured at the jth moment. Alternatively, the interval time may be 2 ms. And respectively measuring the height values of a plurality of position points of the object to be measured, and calculating to obtain the length values corresponding to the position points.
In one embodiment, the length L of the strip steel fiber strip can be calculated by measuring i height values after i-1 interval time periods, and specifically, the length L of the strip steel fiber strip can be obtained by summing the lengths of i-1 sub-fiber strips measured in the time of i. Wherein, the calculation formula is as follows:
wherein h is0Is the height value of the initial position; h isj-hj-1Is the difference between the height value at the j-th time and the height value at the j-1 th timeThe vertical displacement of the strip steel in the vertical direction at the jth moment and the jth-1 moment can be expressed as delta h; t is tj-tj-1The difference between the jth moment and the jth-1 moment can be regarded as the sampling period of the laser three-point measurement module 10, and can be represented as Δ t; v. ofjThe rolling speed of the strip steel at the jth moment can be used.
It can be seen that the horizontal displacement of the strip steel within the j time and the j-1 time is vjΔ t; and (3) converting the vertical displacement and the horizontal displacement of the strip steel within the interval time delta t between the j moment and the j-1 moment to obtain the corresponding unit fiber strip length which can be expressed as delta L, and summing the lengths of all the sub fiber strips measured within the i moment to obtain the length L of the strip steel fiber strip at the corresponding position point.
Step 115: and calculating the movement length to obtain a first straightness of the plurality of position points.
For example, a series of height values can be obtained by measuring the height values of a plurality of position points, the movement lengths of the plurality of position points can be obtained by the movement length calculation method, and the first flatness basic indexes of the plurality of position points can be obtained by the calculation formula of the elongation percentage of the movement lengths of the plurality of position points.
In one example, as shown in fig. 3, nine sliver lengths are measured for nine location points, which can be expressed as: l is1、L2、L3、L4、L5、L6、L7、L8、L9. The positions of the two parts respectively cover the center and two sides of the width direction of the surface of the strip steel, and specifically comprise the left and right edges, 1/4 edges and the center of the width direction of the surface of the strip steel.
For example, assuming that the width of the strip is denoted by W, the right direction of the width is a positive direction in fig. 3, and the position of the center line of the surface of the strip is a coordinate origin, the specific physical positions of the left and right edges may be denoted by mathematical signs as-W/2, the specific physical positions of the left and right 1/4 edges may be denoted by mathematical signs as-W/4, and the specific physical position of the center is a position where W is 0.
Specifically, step 113 may further include step 111 and step 112.
Step 111: filtering the height values corresponding to the plurality of position points to obtain filtered height values;
illustratively, in the rolling process, the flatness defect is mainly caused by plastic deformation generated by uneven compression of the strip steel in the thickness direction, and the flatness condition of the steel plate can be improved by timely adjusting the distribution of rolling force according to the flatness index.
The uneven stress in the thickness direction is mainly generated by the deformation of bending or inclination and the like of the roller, the flatness defect of the strip steel surface has fluctuation, and the wavelength range is in the circumferential length or rolling width magnitude of the roller. Therefore, the surface fluctuation of the strip steel in the wavelength range on the order of the perimeter or the rolling width of the roller can reflect the real uneven condition of the rolling force better, and the fluctuation in the wavelength range can be expressed as a target fluctuation curve by a mathematical curve. The indexes such as elongation and flatness calculated according to the length of the target fluctuation curve can be used for adjusting the distribution of rolling force and improving the flatness condition of the steel plate.
Further, when the laser three-point measurement module 10 measures the height values of multiple position points of the object to be measured, optionally, errors caused by multiple conditions, such as errors caused by foreign matters such as iron scales on the surface of the strip steel, errors caused by splashing water drops in the measurement light path, measurement errors caused by the height measurement in each time, errors caused by the fact that the height of the surface of the strip steel is continuously changed, and the like, may cause high-frequency changes of the height measurement result, so that when the length of the fiber strips on the surface of the strip steel is calculated, a larger deviation occurs compared with the length of a target fluctuation curve.
Step 112: and calculating the filtering height value and the movement speed of the object to be detected to obtain the movement lengths of the object to be detected at the plurality of position points.
Illustratively, in order to reduce the errors caused by the above-mentioned various situations and to screen a suitable target fluctuation wavelength range, a data processing program of a long-pass filter is used to filter the height fluctuation data with short wavelength and retain the filtering processing of the height fluctuation data with long wavelength for a series of height values measured by the laser three-point measurement module 10. The height values of the height change components with high frequency and short wavelength filtered are processed based on the method for calculating the movement length, so that the movement length of the object to be measured at a plurality of specific width positions can be obtained.
In one example, height values obtained by measuring nine position points on the surface of the strip steel are input into a long-pass filter to filter short-wavelength height fluctuation data, filtering processing of long-wavelength height fluctuation data is reserved, nine fiber strip length value data are obtained by utilizing the height filtering values based on the calculating method, measuring errors are reduced, and calculating accuracy of the fiber strip length value data is improved. The filter factor of the filter is related to the desired cut-off wavelength, rolling width and strip rolling speed.
The first flatness can represent an elongation index of a single specific physical position in the width direction of the surface of the object to be measured, can represent a local basic flatness defect of the surface of the object to be measured, but cannot quantify the flatness defect of the whole surface of the object to be measured.
Considering that the number of the fiber strips on the strip may vary with the width of the strip, the positions of the fiber strips may also vary with the position of the edge and the position of the center line of the steel plate. Therefore, the first flatness basic index of the fiber strip at the same physical position does not always correspond to the elongation at the same position on the strip steel. Therefore, the first flatness basic index can be further processed to obtain the target flatness, and the target flatness can truly quantify flatness defect information of the surface of the strip steel.
The manner in which flatness defect information is obtained is described below.
Please refer to fig. 5, which is a flowchart illustrating a process of calculating a target flatness according to an embodiment of the present application.
Specifically, step 130 may include step 131, step 132, and step 133.
Step 131: and fitting the first straightness of the plurality of position points to obtain a first polynomial.
Illustratively, a first polynomial approximating the change of the elongation rate on the width curve of the object to be measured can be fitted based on the first flatness index of the specific physical position in the width direction of the surface of the object to be measured. The first polynomial may be expressed as:
y＝Axn+Bx(n-1)+…+Yx+Z
wherein x is a specific physical position in the width direction, -W/2< x < W/2, W is the rolling width, y is the elongation, A, B … Y, Z are coefficients of each term from a higher order term to a lower order term in order, and n is a polynomial term. The value of n is generally between 2 and 4, and the larger n is, the overfitting is caused.
In one example, n is 2, the first polynomial is a parabolic function curve, and the parabolic function curve can be expressed as:
y＝Ax2+Bx+C
wherein, the quadratic term coefficient A of the parabola determines the opening direction and the size of the parabola and is related to the deflection of the roller; the first-order coefficient B determines the inclination direction of the symmetry axis of the parabola and is related to the horizontal of the roller; c is an offset, determines the intersection point of the parabola and the coordinate axis, and has no practical physical significance.
The method has the advantages that the first flatness indexes of a plurality of different width positions of the object to be measured are fitted to obtain a polynomial which is similar to the change of the elongation rate on the width curve of the object to be measured, the flatness defect of the surface of the object to be measured is quantitatively reflected in the form of a mathematical curve, the method is more visual and clear, the height value is measured in real time, the dynamic change of the first flatness is observed in real time, and the continuous, online, real-time and automatic measurement capability of the scheme is improved.
Please refer to fig. 6, which is a flowchart illustrating a flatness defect type determination method according to an embodiment of the present disclosure. The specific flow shown in fig. 6 will be described in detail below.
Further, step 131 may also include steps 131a, 131b, 131 c.
Fitting a first flatness index of a plurality of different width positions of an object to be measured to obtain a polynomial curve which is similar to the change of the elongation rate on the width curve of the object to be measured, carrying out a series of treatments on the curve, classifying flatness defects, and dividing common flatness defects into three types, namely middle waves, edge waves, two-rib waves and the like.
As shown in fig. 7, three types of flatness defects of middle wave, side wave and two-rib wave and their corresponding distribution curves of the elongation in the width direction are shown.
Wherein, (a) and (b) are geometric schematic diagrams of the middle wave type flatness defect and corresponding elongation rate distribution thereof, and the object surface with the width W is known from (a) to have waves in the middle part, so that the elongation rate is larger when the object surface is closer to the middle part along the width direction; (c) and (d) a geometric schematic diagram of edge wave type flatness defects and the corresponding elongation distribution thereof, wherein the edges on two sides of the surface of the object with the width W are known to have waves from (c), so that the closer to the edges along the width direction, the greater the elongation is; (e) and (f) a geometric schematic diagram of the two-rib-wave type flatness defect and the corresponding elongation distribution thereof, wherein the position W/4 on both sides of the surface of the object with the width W is known to have waves from (e), and therefore, the closer to the position W/4 on both sides in the width direction, the larger the elongation is.
As can be seen from fig. 7, the quadratic polynomial cannot fit the distribution of the elongation of the surface of the object in the whole width direction, for example, the surface of the object has two-rib-wave type flatness defects.
Optionally, a piecewise fitting method is adopted to respectively fit the elongation rate distribution curves of the left, middle and right position areas in the width direction of the strip steel, and different flatness defect types are judged according to the characteristics of the elongation rate distribution curve function.
Specifically, step 131 a: fitting a first flatness of a plurality of location points of a first location area of the plurality of location points to obtain the first polynomial for the first location area;
illustratively, the area occupied by the plurality of position points is divided into three areas based on the measured first straightness of the plurality of position points, the first straightness measured by the position points of a part of the areas is selected, and polynomial fitting is performed to obtain a first polynomial representing the elongation curve of the position area.
Optionally, length data, i.e. L, of 5 fiber strips on the left side of the strip steel is selected1、L2、L3、L4、L5And calculating corresponding first straightness based on an elongation calculation formula, performing polynomial fitting, and fitting out an elongation distribution parabolic function of the approximate left area of the strip steel surface, wherein the elongation distribution parabolic function can be expressed as:
yl＝Alx2+Blx+Cl
wherein, ylThe elongation of the left region, AlCoefficient of quadratic term of parabolic function for the left region elongation distribution; b islDistributing the coefficient of the first order term of a parabolic function for the elongation of the left region; clThe coefficient of the constant term of the parabolic function is distributed for the elongation of the left region. The physical meaning is as described above and will not be described herein.
Step 131 b: fitting a first flatness of a plurality of location points of a second location area of the plurality of location points to obtain the first polynomial for the second location area;
illustratively, based on the three divided regions, a first flatness measured by the position points of the second partial region is selected, and polynomial fitting is performed to obtain a first polynomial representing the elongation rate curve of the second partial region.
Optionally, length data, i.e. L, of 5 fiber strips on the center side of the strip steel is selected3、L4、L5、L6、L7And calculating corresponding first straightness based on an elongation calculation formula, performing polynomial fitting, and fitting out an elongation distribution parabolic function of the approximate center side area of the strip steel surface, wherein the elongation distribution parabolic function can be expressed as:
yc＝Acx2+Bcx+Cl
wherein, ycThe elongation at the center side region, AcCoefficient of quadratic term of the parabolic function is distributed for the elongation of the central side region; b iscThe coefficient of the first order term of the parabolic function is distributed for the elongation of the central side region. The physical meaning is as described above and will not be described herein.
Step 131 c: fitting a first flatness of a plurality of location points of a third location area of the plurality of location points to obtain the first polynomial of the third location area;
illustratively, based on the three divided regions, a first flatness measured by the position points of the third partial region is selected, and polynomial fitting is performed to obtain a first polynomial representing the elongation rate curve of the third partial region.
Optionally, length data, i.e. L, of 5 fiber strips on the right side of the strip steel is selected5、L6、L7、L8、L9And calculating corresponding first straightness based on an elongation calculation formula, performing polynomial fitting, and fitting out an elongation distribution parabolic function of the approximate right area of the surface of the strip steel, wherein the elongation distribution parabolic function can be expressed as:
yr＝Arx2+Brx+Cl
wherein, yrThe elongation in the right region, ArCoefficient of quadratic term of the parabolic function for the right region elongation distribution; b isrThe coefficient of the first order term of the parabolic function is distributed for the elongation of the right region. The physical meaning is as described above and will not be described herein.
Optionally, step 131 may further comprise step 140.
Step 140: determining the flatness defect type of the object to be measured according to the first polynomial, the first polynomial of the first position region, the first polynomial of the second position region and the first polynomial of the third position region.
Exemplarily, based on the three parabolic function curves corresponding to the three position areas divided by the surface of the object to be measured obtained in the fitting steps 131a, 131b, and 131c, the respective coefficients of the four parabolic function curves are extracted by combining the parabolic function curve of the overall elongation distribution of the surface of the object to be measured obtained in the step 131, and are compared and judged, so as to determine the flatness defect type of the object to be measured.
In one embodiment, three parabolic functions of elongation distribution are fitted based on the elongation of 5 fiber strips on the left side of the strip steel, the elongation of 5 fiber strips in the middle and the elongation of 5 fiber strips on the right side of the strip steel, and compared with the integral elongation distribution curve on the surface of the strip steel, comprehensive judgment is carried out:
when A is<0、Ac<0. And L is1<L5、L9<L5And meanwhile, the flatness defect type of the strip steel can be judged to be middle wave.
When A is>0、Ac>0. And L is1>L5、L9>L5And meanwhile, the flatness defect type of the strip steel can be judged to be edge wave.
When A isc<0. And A isl>0、Ar>When 0, the flatness defect type of the strip steel can be judged to be two-rib wave.
Step 132: normalizing the first polynomial to obtain a second polynomial;
illustratively, the specific physical location is scaled to the same interval by normalization in order to compare the calculated target flatness.
Further, normalizing the first polynomial, optionally normalizing the coefficients A and B, which can represent flatness information, according to the strip width, thereby normalizing the quadratic parabolic function to make it possible to normalize the quadratic parabolic function
The normalized converted second polynomial may be represented as:
y＝Sz2+Rz+C
wherein: z represents the relative position in the width direction, z is a percentage and z has a value of
The value range is (-1, 1); s is a quadratic coefficient of the second polynomial, and after normalization, the value of S is
S can be expressed as a symmetric flatness coefficient; r is a second polynomialNormalized, the value of R is
R can be expressed as an asymmetric flatness coefficient.
Further, the international convention uses the unit I for 10-5The component of the symmetrical flatness coefficient S and the component of the asymmetrical flatness coefficient R are directly expressed by the unit I, the symmetrical flatness index and the asymmetrical flatness index are respectively quantized, and the roll deflection and the roll level of the strip steel can be respectively quantized. The polynomial is normalized, so that the comprehension and comparison of the polynomial coefficients of the flatness curve are facilitated.
Step 133: and performing data conversion on the second polynomial to obtain the target straightness of the object to be detected in motion.
Illustratively, based on the first polynomial and the second polynomial fitted in the above steps, specific numerical values are substituted into the second polynomial, and flatness indexes which can represent real defects are calculated, and can correspond to virtual fiber strips at the same position on the surface of the strip steel, so that the accuracy of the result is improved.
In one embodiment, the target flatness of any relative position on the surface of the strip can be obtained by substituting z-1/2, z-1/4, z-0, z-1/4 and z-1/2 into the second polynomial, and the elongation indexes respectively representing the left edge position, the left 1/4 position, the center position, the right 1/4 position and the right edge position in the width direction of the strip can be obtained by calculating the corresponding y value.
The normalized polynomial is subjected to data conversion, so that the elongation at any position can be compared, and the capability of truly reflecting the flatness defect of the measurement index in the scheme is improved.
Please refer to fig. 8, which is a functional block diagram of a flatness measuring apparatus according to an embodiment of the present disclosure. Each module in the flatness measuring apparatus in this embodiment is used for performing each step in the above method embodiment, and specifically includes a first measuring module 210, a calculating module 220, and a processing module 230; wherein the content of the first and second substances,
the first measurement module 210: the height value of a plurality of position points of the object to be measured in motion is acquired;
a calculating module 220, configured to calculate the height values to obtain a first straightness of the plurality of position points;
the processing module 230 is configured to process the first straightness of the plurality of position points to obtain a target straightness of the object to be measured.
Fig. 9 is a block diagram of an electronic device. The electronic device 300 may include a memory 311, a memory controller 312, a processor 313, a peripheral interface 314, an input-output unit 315, and a display unit 316. It will be understood by those skilled in the art that the structure shown in fig. 9 is merely illustrative and is not intended to limit the structure of the electronic device 300. For example, electronic device 300 may also include more or fewer components than shown in FIG. 9, or have a different configuration than shown in FIG. 9.
The above-mentioned memory 311, memory controller 312, processor 313, peripheral interface 314, input/output unit 315 and display unit 316 are electrically connected to each other directly or indirectly to implement data transmission or interaction. For example, the components may be electrically connected to each other via one or more communication buses or signal lines. The processor 313 described above is used to execute executable modules stored in memory.
The Memory 311 may be, but is not limited to, a Random Access Memory (RAM), a Read Only Memory (ROM), a Programmable Read-Only Memory (PROM), an Erasable Read-Only Memory (EPROM), an electrically Erasable Read-Only Memory (EEPROM), and the like. The memory 311 is configured to store a program, and the processor 313 executes the program after receiving an execution instruction, and the method executed by the electronic device 300 defined by the process disclosed in any embodiment of the present application may be applied to the processor 313, or implemented by the processor 313.
The processor 313 may be an integrated circuit chip having signal processing capabilities. The Processor 313 may be a general-purpose Processor, and includes a Central Processing Unit (CPU), a Network Processor (NP), and the like; the Integrated Circuit may also be a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other programmable logic device, a discrete gate or transistor logic device, or a discrete hardware component. The various methods, steps, and logic blocks disclosed in the embodiments of the present application may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The peripheral interface 314 couples various input/output devices to the processor 313 and to the memory 311. In some embodiments, peripheral interface 314, processor 313, and memory controller 312 may be implemented in a single chip. In other examples, they may be implemented separately from the individual chips.
The input/output unit 315 is used for providing input data to a user. The input/output unit 315 may be, but is not limited to, a mouse, a keyboard, and the like.
The display unit 316 provides an interactive interface (e.g., a user interface) between the electronic device 300 and the user for reference. In this embodiment, the display unit 316 may be a liquid crystal display or a touch display. The liquid crystal display or the touch display can display the process of the program executed by the processor.
The electronic device 300 in this embodiment may be configured to perform each step in each method provided in this embodiment.
Furthermore, an embodiment of the present application also provides a computer-readable storage medium, on which a computer program is stored, where the computer program is executed by a processor to perform the steps of the flatness measuring method described in the above method embodiment.
The computer program product of the flatness measuring method provided in the embodiment of the present application includes a computer-readable storage medium storing a program code, where instructions included in the program code may be used to execute the steps of the flatness measuring method described in the above method embodiment, which may be referred to in the above method embodiment specifically, and are not described herein again.
In summary, the present application provides a flatness measuring method, a flatness measuring apparatus, an electronic device, and a storage medium, where the method includes obtaining height values of a plurality of position points of an object to be measured in motion; calculating the height value to obtain a first straightness of the plurality of position points; and processing the first straightness of the plurality of position points to obtain the target straightness of the object to be measured.
In the implementation process, a plurality of groups of laser three-point measuring modules 10 based on a triangulation method are adopted to dynamically measure the height values of a plurality of position points on the surface of the object to be measured, the movement length is calculated by combining the movement speed of the object to be measured, and a first flatness index and a target flatness index which can reflect the surface flatness defect of the object to be measured are obtained by integrating a plurality of movement lengths; meanwhile, the flatness defect type of the object to be detected can be comprehensively judged according to the first flatness fitting polynomial of the plurality of position points; the flatness measuring method improves the precision and accuracy of flatness measuring results, and has the capability of continuous, online, real-time and automatic measurement.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method can be implemented in other ways. The apparatus embodiments described above are merely illustrative, and for example, the flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments of the present application. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
In addition, functional modules in the embodiments of the present application may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.
The functions, if implemented in the form of software functional modules and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application or portions thereof that substantially contribute to the prior art may be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes. It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. A flatness measuring method, comprising:
acquiring height values of a plurality of position points of an object to be detected in motion;
calculating the height value to obtain a first straightness of the plurality of position points;
and processing the first straightness of the plurality of position points to obtain the target straightness of the object to be measured.
2. The method of claim 1, wherein the obtaining height values for a plurality of location points of the object in motion comprises:
irradiating a plurality of position points of an object to be measured in motion by adopting a plurality of groups of laser three-point measuring modules so as to obtain a plurality of light spots corresponding to the position points;
and determining the height values of the plurality of position points according to the plurality of light spots based on a light spot imaging theory.
3. The method of claim 1, wherein said calculating the height value to obtain a first straightness for the plurality of location points comprises:
calculating the height value and the movement speed of the object to be detected to obtain the movement lengths of the object to be detected at the plurality of position points;
and calculating the movement length to obtain a first straightness of the plurality of position points.
4. The method of claim 3, wherein the calculating the height value and the moving speed of the object to be measured to obtain the moving lengths of the object to be measured at the plurality of position points comprises:
calculating according to the height value of the jth position and the movement speed of the object to be detected to obtain the jth sub-movement length of the object to be detected between the jth moment and the jth +1 moment, wherein j is a positive integer which is greater than or equal to one and less than or equal to i-1, i is the total number of the obtained height values, and the height value of the jth position is the height value measured at the jth moment;
and calculating the movement lengths of the object to be measured at the plurality of position points according to the sub-movement lengths from the first time to the ith time.
5. The method according to claim 3 or 4, wherein the calculating the height value and the moving speed of the object to be measured to obtain the moving lengths of the object to be measured at the plurality of position points comprises:
filtering the height values corresponding to the plurality of position points to obtain filtered height values;
and calculating the filtering height value and the movement speed of the object to be detected to obtain the movement lengths of the object to be detected at the plurality of position points.
6. The method of claim 1, wherein processing the first flatness of the plurality of location points to obtain a target flatness comprises:
fitting the first straightness of the plurality of position points to obtain a first polynomial;
normalizing the first polynomial to obtain a second polynomial;
and performing data conversion on the second polynomial to obtain the target straightness of the object to be detected in motion.
7. The method of claim 6, wherein said fitting a first flatness of said plurality of location points to obtain a first polynomial comprises:
fitting a first flatness of a plurality of location points of a first location area of the plurality of location points to obtain the first polynomial for the first location area;
fitting a first flatness of a plurality of location points of a second location area of the plurality of location points to obtain the first polynomial for the second location area;
fitting a first flatness of a plurality of location points of a third location area of the plurality of location points to obtain the first polynomial of the third location area;
the method further comprises the following steps:
determining the flatness defect type of the object to be measured according to the first polynomial, the first polynomial of the first position region, the first polynomial of the second position region and the first polynomial of the third position region.
8. A flatness measuring apparatus, comprising:
the first measurement module is used for acquiring height values of a plurality of position points of an object to be measured in motion;
the calculation module is used for calculating the height value to obtain a first straightness of the plurality of position points;
and the processing module is used for processing the first straightness of the plurality of position points to obtain the target straightness of the object to be detected.
9. An electronic device, comprising: a processor, a memory storing machine-readable instructions executable by the processor, the machine-readable instructions when executed by the processor performing the steps of the method of any of claims 1 to 7 when the electronic device is run.
10. A computer-readable storage medium, having stored thereon a computer program which, when being executed by a processor, is adapted to carry out the steps of the method according to any one of claims 1 to 7.
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| CN211855240U (en) * | 2020-05-20 | 2020-11-03 | 西安嘉业航空科技有限公司 | Monitoring equipment for straightness of shaft to be detected |
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