CN115625217A - Cold rolling thickness online detection method and detection system - Google Patents
Cold rolling thickness online detection method and detection system Download PDFInfo
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- CN115625217A CN115625217A CN202211327449.XA CN202211327449A CN115625217A CN 115625217 A CN115625217 A CN 115625217A CN 202211327449 A CN202211327449 A CN 202211327449A CN 115625217 A CN115625217 A CN 115625217A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
- B21B38/04—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring thickness, width, diameter or other transverse dimensions of the product
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
- B21B2038/004—Measuring scale thickness
Abstract
The invention relates to an on-line detection method and a detection system for cold rolling thickness, which respectively calculate the theoretical thickness H of strip steel through a model A, a model B and a model C A 、H B And H C Detecting the real-time thickness H of the strip steel by a thickness meter arranged at the outlet of the rolling mill, and measuring H A 、H B And H C Respectively comparing the thickness difference with the real-time thickness h of the strip steel to obtain the thickness difference percentage, and determining the detection accuracy of the thickness gauge according to the thickness difference percentage; the invention can output alarm signals when the abnormity is detected to remind field operators and inspectors to carry out calibration and calibration on the thickness gauge.
Description
Technical Field
The invention relates to an online detection method and an online detection system for cold rolling thickness, and belongs to the technical field of material processing engineering.
Background
The thickness measurement of the cold rolling mill generally adopts an X-ray thickness gauge, the detection precision of the thickness gauge is influenced by multiple factors such as X-ray source attenuation, alloy compensation, an oil mist environment in the rolling mill, angles of strip steel and the thickness gauge and the like, in the actual production process, the thickness gauge possibly has large deviation due to the factors such as equipment tool condition change, oil sludge adhesion to a thickness gauge probe, deviation of angle setting of the thickness gauge, unreasonable alloy compensation setting and the like, but the thickness automatic control (AGC) of the cold rolling mill depends on the detection data of the X-ray thickness gauge to carry out feedback adjustment, a detector trusts on the thickness gauge, once the thickness gauge has large error, the detection of a manual micrometer cannot be found in time, and batch thickness inconsistency is easy to occur.
For example, when a tin plate is rolled in a certain factory, the actual thickness of the target thickness is 0.19mm to 0.21mm, the difference between the thickness detected by a thickness gauge and the actual thickness of the strip steel is 10 percent and far exceeds the conventional thickness tolerance requirement of +/-3 percent of the tin plate, and due to the fact that the thickness is not found out to be out of tolerance in time by inspectors, the excessive degradation of the total thickness of the tin plate produced in a certain night shift is caused, and great loss is caused to enterprises.
In order to solve the problems, engineers study various detection technologies, for example, application No. 202121244606.1 discloses an aluminum thickness online detection device for a cold rolling mill set, which is convenient for thickness detection of an aluminum plate in production by setting a detection mechanism, when the aluminum plate enters an internal conveying mechanism of a device body through a discharge port and is conveyed, the end part of the aluminum plate is firstly contacted with a bent plate, then the bent plate is pushed under the conveying of the conveying mechanism to enable a telescopic rod to move upwards in an adjusting cylinder, when the aluminum plate completely moves to the internal part of the device body, the conveying mechanism is stopped to operate, then scale line values corresponding to the top of the telescopic rod are observed through an observation window, namely the thickness of the aluminum plate at the position is obtained, meanwhile, the detection mechanisms are provided with a plurality of detection mechanisms, and are convenient for detecting a plurality of positions of the aluminum plate, thereby improving the detection accuracy. That is, the prior art mainly uses the detection device for detection, which results in too high detection cost and no guarantee of detection accuracy.
In order to avoid the risks, an online simple cold rolling thickness inspection method needs to be provided, and when an abnormality occurs, an alarm signal is output to remind field operators and inspectors of checking and calibrating the thickness gauge in time.
Disclosure of Invention
The invention provides an online detection method and a detection system for cold rolling thickness, which can output an alarm signal when abnormality is detected to remind field operators and inspectors to check and calibrate a thickness gauge in time.
The technical scheme adopted by the invention for solving the technical problems is as follows:
an online detection method for cold rolling thickness specifically comprises the following steps:
step S1: calculating the theoretical thickness H of the strip steel through the model A A The model A is used for calculating the data based on the radius difference of the steel strips at any two moments in the cold-rolled steel coil and the number difference of the steel coil turns at any two moments;
step S2: calculating the theoretical thickness H of the strip steel through the model B B The model B calculates the data based on the area of the circular ring on the side surface of the cold-rolled steel coil and the length of the strip steel;
and step S3: calculating the theoretical thickness H of the strip steel through the model C C Wherein the model C calculates the data based on the thickness of the cold-rolled steel coil at the inlet of the rolling mill, the strip speed at the inlet of the rolling mill and the strip speed at the outlet of the rolling mill;
and step S4: the thickness meter arranged at the outlet of the rolling mill detects the real-time thickness H of the strip steel, and then the H is measured A 、H B And H C Respectively comparing the thickness difference with the real-time thickness h of the strip steel to obtain the thickness difference percentage, and determining the detection accuracy of the thickness gauge according to the thickness difference percentage;
as a further preferred embodiment of the invention, the theoretical thickness H of the strip is calculated by means of a model A A The method comprises the following specific steps:
step S11: when a cold rolling unit rolls and coils strip steel, after the strip steel enters a stable rolling stage from a rising speed, defining the moment as a zero moment, and reading a strip speed V (0) of the strip steel, a motor rotating speed M (0) of a coiling machine and a motor rotating number M (0) of the coiling machine at the zero moment;
step S12: obtaining a steel coil rotating speed N (0) and a steel coil turn number N (0) at the zero moment according to the steel coil belt speed V (0) at the zero moment, the motor rotating speed M (0) of the coiling machine and the motor rotating turn number M (0) of the coiling machine read in the step S11;
step S13: calculating the zero-moment steel strip radius R (0) according to the steel coil rotating speed N (0) and the steel coil number N (0) of the zero moment acquired in the step S12;
step S14: repeating the steps S11 to S13 by taking every 50 milliseconds as an increasing unit, and calculating the coil number n (t) of the steel coil at the moment t and the radius R (t) of the strip steel;
step S15: h is calculated by the obtained n (0), R (0), n (t) and R (t) A ；
As a further preferred aspect of the present invention,
in step S1, H A The calculation formula of (2) is as follows:
H A ＝ΔR/Δn (A-1)
in the formula (A-1), delta R is the difference of the radius of the steel strip at any two moments, delta n is the difference of the number of turns of the steel coil at any two moments, delta R = R (t) -R (0), and delta n = n (t) -n (0);
the calculation formula of the radius of the strip steel at the moment t is as follows:
R(t)＝V(t)/(2π*N(t)) (A-2)
in the formula (a-2), R (t) is the radius of the steel strip at the time t, N (t) is the steel coil speed at the time t, and V (t) is the steel coil speed at the time t, wherein the calculation formula of the steel coil speed N (t) at the time t is:
N(t)＝M(t)/I (A-3)
in the formula (A-3), M (t) is the motor rotating speed of the coiling machine at the moment t, and I is the transmission ratio of a gearbox of the coiling machine and is a mechanically fixed constant;
the calculation formula of the coil number n (t) at the moment t is as follows:
n(t)＝m(t)/I (A-4)
in the formula (A-4), m (t) is the number of rotating turns of a motor of the coiling machine at the moment t, and I is the transmission ratio of a gearbox of the coiling machine and is a mechanically fixed constant;
as a further preferred feature of the invention, the theoretical thickness H of the strip is calculated by means of a model B B The method comprises the following specific steps:
step S21: acquiring the steel strip speed V (t) of the steel strip at the moment t, and calculating the length L of the steel strip by using an integral method and taking every 50 milliseconds as a growth unit;
step S22: calculating the radius R (t) of the strip steel at the moment t;
step S23: calculating the area S (t) of the circular ring on the side surface of the cold-rolled steel coil through the R (t) acquired in the step S22;
step S24: h is calculated by the length L of the steel strip obtained in the step S21 and the area S (t) of the side ring of the cold-rolled steel coil obtained in the step S23 B ；
As a further preferred aspect of the present invention, in step S2, H B The calculation formula of (2) is as follows:
H B ＝S/L (B-1)
in the formula (B-1), S is the area of a circular ring on the side surface of the cold-rolled steel coil, and L is the length of the strip steel;
the calculation formula of the length L of the strip steel is as follows:
in the formula (B-2), V (t) is the steel coil speed at the moment t;
the calculation formula of the area S of the circular ring on the side surface of the cold-rolled steel coil is as follows:
S(t)＝πR 2 (t)-πR 2 (0) (B-3)
in the formula (B-3), R (t) is the radius of the strip steel at the moment t, and the calculation method is a formula (A-2) and a formula (A-3);
as a further optimization of the invention, the theoretical thickness H of the strip steel is calculated by the model C C The calculation formula of (2) is as follows:
H B ＝H inlet port *V Inlet port /V An outlet (C-1)
In the formula (C-1), H Inlet port For cold-rolled steel coils at the mill entry thickness, V Inlet port For the strip speed at the mill entry, V An outlet The strip speed at the outlet of the rolling mill;
as a further preferred aspect of the present invention, the calculation formula of the thickness difference percentage in step S4 is:
e＝(H-h)/h
wherein e is the percentage of thickness difference, and H is H A Or H B Or H C H is the real-time thickness of the strip steel;
as a further preference of the present invention, when H is H A Or H B When the thickness difference percentage is less than 3%, the detection of the thickness instrument meets the standard;
when H is H C When the thickness difference percentage is less than 2%, the detection of the thickness instrument meets the standard;
the detection system for the cold rolling thickness online detection method comprises a coiling machine and a rolling machine, wherein strip steel sequentially penetrates through the rolling machine and the coiling machine, a laser velocimeter and a thickness gauge are distributed at an inlet of the rolling machine, the laser velocimeter and the thickness gauge are also distributed at an outlet of the rolling machine, and the thickness gauges on two sides of the rolling machine are close to the rolling machine;
installing a pulse generator on the coiling machine;
the laser velocimeter is used for reading the steel coil speed V (t) at the moment t, and the pulse generator is used for reading the motor rotating speed M (t) of the coiler at the moment t and the number M (t) of motor rotations of the coiler at the moment t.
Through the technical scheme, compared with the prior art, the invention has the following beneficial effects:
1. according to the online detection method for the cold rolling thickness, the thickness is verified in real time by adopting three online simple models, the detection method is simple, and the detection accuracy can be improved by superposition judgment of the three models;
2. according to the detection system for the cold rolling thickness online detection method, the laser velocimeter and the pulse generator are arranged, so that the data required by the online simple model can be accurately acquired, the manufacturing cost of the system is low, and the requirements are easily met.
Drawings
The invention is further illustrated with reference to the following figures and examples.
FIG. 1 is a simple schematic diagram of a system for an online detection method of cold rolling thickness provided by the invention.
In the figure: 1 is a coiling machine, 2 is a rolling mill, 3 is a laser velocimeter, and 4 is a thickness gauge.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings. In the description of the present application, it is to be understood that the terms "left side", "right side", "upper part", "lower part", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and that "first", "second", etc., do not represent an important degree of the component parts, and thus are not to be construed as limiting the present invention. The specific dimensions used in the present example are only for illustrating the technical solution and do not limit the scope of protection of the present invention.
As explained in the background art, the current online detection method for the cold rolling thickness still needs to rely on related devices, such operation mode is easy to cause the imbalance of the detection precision, and the operation cost is also high. Based on the method, the real-time data of the laser velocimeter 3 at the rolling mill and the pulse generator at the coiling machine are collected, the cold rolling theoretical thickness is calculated on line through a physical principle, the calculated cold rolling theoretical thickness is compared with the data detected by the thickness meter 4 at the rolling mill, and whether the data deviation occurs in the thickness meter is judged through a preset proportion range.
The online detection method for the cold rolling thickness specifically comprises the following steps:
step S1: calculating the theoretical thickness H of the strip steel through the model A A The model A is used for calculating the data based on the radius difference of the steel strips at any two moments in the cold-rolled steel coil and the number difference of the steel coil turns at any two moments;
step S2: calculating the theoretical thickness H of the strip steel through the model B B The model B calculates the data based on the area of the circular ring on the side surface of the cold-rolled steel coil and the length of the strip steel;
and step S3: calculating the theoretical thickness H of the strip steel through the model C C Wherein the model C calculates the data based on the thickness of the cold-rolled steel coil at the inlet of the rolling mill, the strip speed at the inlet of the rolling mill and the strip speed at the outlet of the rolling mill;
and step S4: the thickness meter arranged at the outlet of the rolling mill detects the real-time thickness H of the strip steel and converts H into H A 、H B And H C And respectively comparing the thickness difference with the real-time thickness h of the strip steel to obtain the thickness difference percentage, and determining the detection accuracy of the thickness gauge according to the thickness difference percentage.
In the detection method, the model A, the model B and the model C are set as the invention points of the application, the corresponding theoretical thickness of the strip steel is obtained through the establishment of the three models, the superposition detection of the multiple models can more accurately judge whether the thickness gauge is qualified or not, however, the more the models are, the better the model is, after the multiple tests are carried out, the applicant finds that the cost control is optimal while the three effects are selected.
Next, how to calculate the theoretical thickness of the strip steel by using the model a, the model B, and the model C will be described in detail. Firstly, the theoretical thickness H of the strip steel is calculated through a model A A The model a is based on the principle that the thinner the strip steel is, the smaller the gap between the layers of the strip steel in the steel coil is, and the gap can be ignored for cold-rolled tin-plated sheet with the thickness less than 0.5mm, so that it can be considered that: the difference between the radii of any two layers of steel strips in the cold-rolled steel coil is equal to the number of layers between the two layers of steel strips multiplied by the thickness of the steel coil. If any two of the steel coils are accurately obtainedThe radius and the number of the layers of the layer strip steel can accurately calculate the thickness of the cold-rolled steel coil.
The method comprises the following specific steps:
step S11: when a cold rolling unit rolls and coils strip steel, after the strip steel enters a stable rolling stage from a rising speed, the moment is defined as zero, and the strip speed V (0) of the strip steel at the zero moment is read (matched with data measured by a laser velocimeter at an outlet in a figure 1), the motor rotating speed M (0) of a coiling machine 1 and the number M (0) of rotating turns of a motor of the coiling machine;
step S12: obtaining the steel coil rotating speed N (0) and the steel coil turn number N (0) at the zero moment according to the steel coil belt speed V (0) at the zero moment, the motor rotating speed M (0) of the coiling machine and the motor rotating turn number M (0) of the coiling machine read in the step S11;
step S13: calculating the zero-moment steel strip radius R (0) according to the steel coil rotating speed N (0) and the steel coil number N (0) of the zero moment acquired in the step S12;
step S14: repeating the steps S11 to S13 by taking every 50 milliseconds as an increasing unit, and calculating the coil number n (t) of the steel coil at the moment t and the radius R (t) of the strip steel;
step S15: h is calculated by the obtained n (0), R (0), n (t) and R (t) A 。
The related calculation formula involved in the above steps includes H A The calculation formula of (c) is:
H A ＝ΔR/Δn (A-1)
in the formula (A-1), delta R is the difference of the radius of the steel strip at any two moments, delta n is the difference of the number of turns of the steel coil at any two moments, delta R = R (t) -R (0), and Delta n = n (t) -n (0); here, R (0) and n (0) are actually acquired data at a zero time, and may also be regarded as detection data at an initial time, and t time represented by R (t) and n (t) is actually detection data at any time that needs to be used.
According to the relation between the linear velocity and the angular velocity, the calculation formula of the radius of the strip steel at the moment t is obtained as follows:
R(t)＝V(t)/(2π*N(t)) (A-2)
in the formula (a-2), R (t) is the strip steel radius (m) at the moment t, N (t) is the steel coil speed (R/min) at the moment t, and V (t) is the steel coil speed (m/min) at the moment t, wherein the calculation formula of the steel coil speed N (t) at the moment t is:
N(t)＝M(t)/I (A-3)
in the formula (A-3), M (t) is the motor rotating speed of the coiling machine at the moment t, and I is the transmission ratio of a gearbox of the coiling machine and is a mechanically fixed constant;
the calculation formula of the coil number n (t) at the moment t is as follows:
n(t)＝m(t)/I (A-4)
in the formula (A-4), m (t) is the number of the rotating turns of the motor of the coiling machine at the moment t, and I is the transmission ratio of the gearbox of the coiling machine and is a mechanically fixed constant.
Next, model B is based on the principle that the gaps between the layers of the coil are ignored, and the area of the rings on the side of the cold-rolled coil = the length of the strip steel x the thickness of the strip steel. The method comprises the following specific steps:
step S21: acquiring the steel strip speed V (t) at the moment t, and calculating the length L of the steel strip by using an integral method and taking every 50 milliseconds as a growth unit;
step S22: calculating the radius R (t) of the strip steel at the moment t;
step S23: calculating the area S (t) of the circular ring on the side surface of the cold-rolled steel coil through the R (t) acquired in the step S22;
step S24: h is calculated by the length L of the steel strip obtained in the step S21 and the area S (t) of the side ring of the cold-rolled steel coil obtained in the step S23 B 。
Wherein H B The calculation formula of (2) is as follows:
H B ＝S/L (B-1)
in the formula (B-1), S is the area of a circular ring on the side surface of the cold-rolled steel coil, and L is the length of the strip steel;
the calculation formula of the strip steel length L is as follows:
in the formula (B-2), V (t) is the steel coil speed at the moment t;
the calculation formula of the area S of the circular ring on the side surface of the cold-rolled steel coil is as follows:
S(t)＝πR 2 (t)-πR 2 (0) (B-3)
in the formula (B-3), R (t) is the radius of the strip steel at the moment t, the calculation methods are the formula (A-2) and the formula (A-3), and obviously R (0) is the radius of the strip steel at the zero moment, namely the initial inner diameter of the steel coil.
Finally, calculating the theoretical thickness H of the strip steel through the model C C The principle is based on the principle that the rolling volume is unchanged, the strip speed and the inlet thickness at the outlet and the inlet are calculated, so that the calculation core of the model C is actually the relevant data detected by the laser velocimeter at the outlet, the laser velocimeter at the inlet and the thickness meter at the inlet, and the specific formula is as follows:
H B ＝H inlet port *V Inlet port /V An outlet (C-1)
In the formula (C-1), H Inlet port For cold-rolled steel coils at the mill entry thickness, V Inlet port For the strip speed at the mill entry, V An outlet The mill exit strip speed.
Finally, as explained in step S4, in the primary system of the rolling mill 2, collecting the data of the laser velocimeter, the last frame entrance thickness gauge, the pulse generator of the transmission motor of the coiling machine and other instruments, establishing a theoretical thickness measurement model A, a model B and a model C, and measuring and calculating the theoretical thickness H of the strip steel by using the models A 、H B 、H C And comparing the thickness difference value with the detection data of the rolling mill outlet thickness gauge in real time, wherein the calculation formula of the percentage of the thickness difference value is as follows:
e＝(H-h)/h
wherein e is the percentage of thickness difference, and H is H A Or H B Or H C And h is the real-time thickness of the strip steel.
Determined by off-line thickness measurement, when H is H A Or H B When the percentage of the difference in thickness is less than 3%, when H is H C And meanwhile, the thickness difference percentage is less than 2%, and the thickness meter can detect accurately. Measured in model A and model Be, if one item exceeds 3%, an alarm signal is output in a first-level picture of the rolling mill, the thickness is required to be immediately subjected to off-line inspection, and the working condition of the outlet thickness gauge is diagnosed or the thickness gauge is verified according to a related verification program. And when the e measured and calculated by the model C exceeds 2%, outputting an alarm signal, immediately carrying out off-line inspection on the thickness of the steel coil, and carrying out diagnosis and related calibration on thickness gauges at a rolling inlet and a rolling outlet.
In the provided method for online detection of cold rolling thickness, the checking essence of the model A and the model B is to use the measurement data of the laser velocimeter at the outlet of the rolling mill and the motor pulse generator, and check and compare the data with the data of the thickness gauge through formula calculation. Under the same maintenance conditions, the laser velocimeter and the motor pulse generator are considered to be more stable than the thickness gauge in detection through experience. The checking essence of the model C is that the measured data of the laser velocimeter at the outlet and the inlet of the rolling mill and the measured data of the thickness gauge at the inlet are calculated by a formula and compared with the data of the thickness gauge, the calculation precision is influenced by the thickness gauge at the inlet of the rolling mill, the condition changes such as environment, maintenance and the like theoretically exist as the condition changes of the thickness gauge at the outlet, and from the rolling principle, when the measured thickness at the inlet of the rolling mill deviates from the actual measured thickness, the rolling force can greatly deviate from a set value and the conditions of abnormal fluctuation of the thickness and the like occur during the rolling of the strip steel.
Therefore, the application also provides a detection system aiming at the online detection method, as shown in fig. 1, the detection system comprises a coiling machine and a rolling mill, the strip steel sequentially penetrates through the rolling mill and the coiling machine, a laser velocimeter and a thickness meter are distributed at an inlet of the rolling mill, the laser velocimeter and the thickness meter are also distributed at an outlet of the rolling mill, and the thickness meters on two sides of the rolling mill are both close to the rolling mill; installing a pulse generator on the coiling machine; the laser velocimeter is used for reading the steel coil speed V (t) at the moment t, and the pulse generator is used for reading the motor rotating speed M (t) of the coiler at the moment t and the number M (t) of motor rotations of the coiler at the moment t.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
The meaning of "and/or" as used herein is intended to include both the individual components or both.
The term "connected" as used herein may mean either a direct connection between components or an indirect connection between components via other components.
In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (9)
1. A cold rolling thickness on-line detection method is characterized in that: the method specifically comprises the following steps:
step S1: calculating the theoretical thickness H of the strip steel through the model A A The model A is used for calculating the data based on the radius difference of the steel strips at any two moments in the cold-rolled steel coil and the number difference of the steel coil turns at any two moments;
step S2: calculating the theoretical thickness H of the strip steel through the model B B The model B calculates the data based on the area of the circular ring on the side surface of the cold-rolled steel coil and the length of the strip steel;
and step S3: calculating the theoretical thickness H of the strip steel through the model C C Wherein the model C calculates the data based on the thickness of the cold-rolled steel coil at the inlet of the rolling mill, the strip speed at the inlet of the rolling mill and the strip speed at the outlet of the rolling mill;
and step S4: the thickness meter arranged at the outlet of the rolling mill detects the real-time thickness H of the strip steel, and then the H is measured A 、H B And H C And respectively comparing the thickness difference percentage with the real-time thickness h of the strip steel to obtain the thickness difference percentage, and determining the detection accuracy of the thickness gauge according to the thickness difference percentage.
2. The online detection method for the cold rolling thickness according to claim 1, characterized in that: calculating the theoretical thickness H of the strip steel through the model A A The method comprises the following specific steps:
step S11: when a cold rolling unit rolls and coils strip steel, after the strip steel enters a stable rolling stage from a speed rise, defining the moment as a zero moment, and reading the strip speed V (0) of the steel coil, the rotating speed M (0) of a motor of a coiling machine and the rotating number M (0) of the motor of the coiling machine at the zero moment;
step S12: obtaining the steel coil rotating speed N (0) and the steel coil turn number N (0) at the zero moment according to the steel coil belt speed V (0) at the zero moment, the motor rotating speed M (0) of the coiling machine and the motor rotating turn number M (0) of the coiling machine read in the step S11;
step S13: calculating the zero-moment steel strip radius R (0) according to the steel coil rotating speed N (0) and the steel coil number N (0) of the zero moment acquired in the step S12;
step S14: repeating the steps S11 to S13 by taking every 50 milliseconds as an increasing unit, and calculating the coil number n (t) of the steel coil at the moment t and the radius R (t) of the strip steel;
step S15: h is calculated by the obtained n (0), R (0), n (t) and R (t) A 。
3. The online detection method for the cold rolling thickness as set forth in claim 2, characterized in that:
in step S1, H A The calculation formula of (2) is as follows:
H A ＝ΔR/Δn (A-1)
in the formula (A-1), delta R is the difference of the radius of the steel strip at any two moments, delta n is the difference of the number of turns of the steel coil at any two moments, delta R = R (t) -R (0), and Delta n = n (t) -n (0);
the calculation formula of the radius of the strip steel at the moment t is as follows:
R(t)＝V(t)/(2π*N(t)) (A-2)
in the formula (a-2), R (t) is the radius of the steel strip at the time t, N (t) is the steel coil speed at the time t, and V (t) is the steel coil speed at the time t, wherein the calculation formula of the steel coil speed N (t) at the time t is:
N(t)＝M(t)/I (A-3)
in the formula (A-3), M (t) is the motor rotating speed of the coiling machine at the moment t, and I is the transmission ratio of a gearbox of the coiling machine and is a mechanically fixed constant;
the calculation formula of the coil number n (t) at the moment t is as follows:
n(t)＝m(t)/I (A-4)
in the formula (A-4), m (t) is the number of the rotating turns of the motor of the coiling machine at the moment t, and I is the transmission ratio of the gearbox of the coiling machine and is a mechanically fixed constant.
4. The online detection method for the cold rolling thickness according to claim 3, characterized in that: calculating the theoretical thickness H of the strip steel through the model B B The method comprises the following specific steps:
step S21: acquiring the steel strip speed V (t) of the steel strip at the moment t, and calculating the length L of the steel strip by using an integral method and taking every 50 milliseconds as a growth unit;
step S22: calculating the radius R (t) of the strip steel at the moment t;
step S23: calculating the area S (t) of the circular ring on the side surface of the cold-rolled steel coil through the R (t) acquired in the step S22;
step S24: h is calculated by the length L of the steel strip obtained in the step S21 and the area S (t) of the side ring of the cold-rolled steel coil obtained in the step S23 B 。
5. The online detection method for the cold rolling thickness of claim 4, wherein: in step S2, H B The calculation formula of (c) is:
H B ＝S/L (B-1)
in the formula (B-1), S is the area of a circular ring on the side surface of the cold-rolled steel coil, and L is the length of the strip steel;
the calculation formula of the strip steel length L is as follows:
in the formula (B-2), V (t) is the steel coil speed at the moment t;
the calculation formula of the area S of the circular ring on the side surface of the cold-rolled steel coil is as follows:
S(t)＝πR 2 (t)-πR 2 (0) (B-3)
in the formula (B-3), R (t) is the radius of the strip steel at the moment t, and the calculation methods are a formula (A-2) and a formula (A-3).
6. The online detection method for the cold rolling thickness of claim 5, wherein: calculating the theoretical thickness H of the strip steel through the model C C The calculation formula of (c) is:
H B ＝H inlet *V Inlet port /V An outlet (C-1)
In the formula (C-1), H Inlet port Thickness, V, of cold-rolled coil at the entry of the rolling mill Inlet port For the strip speed at the entry of the rolling mill, V An outlet The mill exit strip speed.
7. The online detection method for the cold rolling thickness of claim 6, wherein: the calculation formula of the thickness difference percentage in the step S4 is as follows:
e＝(H-h)/h
wherein e is the percentage of thickness difference, and H is H A Or H B Or H C And h is the real-time thickness of the strip steel.
8. The online detection method for the cold rolling thickness according to claim 7, characterized in that: when H is H A Or H B When the thickness difference percentage is less than 3%, the detection of the thickness instrument meets the standard;
when H is H C And when the thickness difference percentage is less than 2%, the detection of the thickness meter meets the standard.
9. The detection system for the online detection method of the cold rolling thickness as set forth in claim 8, wherein: the strip steel coiling machine comprises a coiling machine and a rolling mill, wherein the strip steel sequentially penetrates through the rolling mill and the coiling machine, a laser velocimeter and a thickness gauge are distributed at an inlet of the rolling mill, the laser velocimeter and the thickness gauge are also distributed at an outlet of the rolling mill, and the thickness gauges on two sides of the rolling mill are close to the rolling mill;
installing a pulse generator on the coiling machine;
the laser velocimeter is used for reading the steel coil belt speed V (t) at the moment t, and the pulse generator is used for reading the motor rotating speed M (t) of the coiler at the moment t and the number M (t) of motor rotating turns of the coiler at the moment t.
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| CN117232456A (en) * | 2023-11-10 | 2023-12-15 | 北京科技大学 | Accurate detection system and detection method for rolled thickness of aluminum plate strip foil |
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