CN116428993A - Thickness measuring method for metal strip assembly line - Google Patents
Thickness measuring method for metal strip assembly line Download PDFInfo
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- CN116428993A CN116428993A CN202310489275.5A CN202310489275A CN116428993A CN 116428993 A CN116428993 A CN 116428993A CN 202310489275 A CN202310489275 A CN 202310489275A CN 116428993 A CN116428993 A CN 116428993A
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- 239000002184 metal Substances 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000005259 measurement Methods 0.000 claims abstract description 24
- 238000004519 manufacturing process Methods 0.000 claims abstract description 13
- 238000005070 sampling Methods 0.000 claims abstract description 13
- 238000001514 detection method Methods 0.000 claims abstract description 11
- 238000004364 calculation method Methods 0.000 claims abstract description 7
- 238000012544 monitoring process Methods 0.000 claims abstract description 7
- 238000006073 displacement reaction Methods 0.000 claims description 6
- 230000009471 action Effects 0.000 claims description 3
- 230000005484 gravity Effects 0.000 claims description 3
- 230000004044 response Effects 0.000 claims description 3
- 238000005096 rolling process Methods 0.000 claims description 3
- 238000012937 correction Methods 0.000 abstract description 3
- 238000007405 data analysis Methods 0.000 abstract description 3
- 238000011897 real-time detection Methods 0.000 abstract description 3
- 239000000463 material Substances 0.000 description 9
- 239000000523 sample Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 229920000535 Tan II Polymers 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000009683 ultrasonic thickness measurement Methods 0.000 description 1
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- G—PHYSICS
- 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
- G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
- G01B11/06—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness for measuring thickness ; e.g. of sheet material
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Abstract
The invention discloses a thickness measuring method of a metal strip assembly line, which relates to the field of product parameter measurement and quality monitoring, and is implemented by a metal strip thickness automatic detection system, wherein the metal strip thickness automatic detection system comprises a real-time sampling device and a background monitoring computing device of the metal strip assembly line, and the measuring method specifically comprises the following steps: establishing a sampling model reference, determining a sampling data calculation model, determining a measurement offset and determining a light source receiving device; the invention realizes real-time detection in the production process of the metal strip through an automatic means and data analysis and calculation, and provides a new measurement mode, and the measurement accuracy can be effectively improved by synchronously measuring the upper plane and the lower plane and combining with dynamic correction of vibration deviation angle data.
Description
Technical Field
The invention relates to the field of product parameter measurement and quality monitoring, in particular to a thickness measurement method for a metal strip assembly line.
Background
Along with the rapid development of Chinese economy and continuous improvement of industrialization level, the metal strip is widely applied to all links of industrial production, the strip is mainly used in modes of wrapping, pasting and the like, the requirement on thickness precision is high, professional measurement is required to be carried out on the strip, and raw material waste caused by untimely measurement in the production process is avoided. In order to prevent the above phenomena, the production qualification rate cannot be fully improved by adopting a sampling inspection mode for management and control, and for the real-time monitoring of the production condition on the production line, an effective means is not available, and two related measuring methods at present are available:
firstly, ultrasonic thickness measurement: the thickness measurement is carried out according to the ultrasonic pulse reflection principle, when ultrasonic pulses emitted by the probe reach the interface of the material through the measured object, the pulses are reflected back to the probe, and the thickness of the measured material is determined by accurately measuring the propagation time of the ultrasonic waves in the material; secondly, the thickness detection method of the laser ultrasonic thin layer material comprises the following steps: the method comprises the steps of irradiating the surface of a material by utilizing laser pulse, generating stress pulse by thermoelastic effect, transmitting the stress pulse to the inside of a sample or along the surface by ultrasonic waves in the forms of longitudinal waves, transverse waves, surface waves and the like, and characterizing defects by reflection, scattering or attenuation of the ultrasonic waves so as to obtain the thickness of the material.
Both schemes have certain application effects, but still have obvious defects: the first method is to attach the measuring device to the measured object, and to paint the couplant on the surface of the measured material during continuous measurement; the other scheme is mainly used for measuring the thickness of a plating layer or a film layer, and lacks accurate measurement basis for the thickness of the material;
for this purpose, we propose a method for measuring the thickness of a metal strip in-line.
Disclosure of Invention
The invention aims to provide a metal strip thickness measuring method suitable for a production line, which can meet the standard requirement on measuring precision index and avoid the problem of raw material waste caused by untimely measurement in the production process.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the thickness measuring method of the metal strip assembly line is implemented by a metal strip thickness automatic detection system, wherein the metal strip thickness automatic detection system comprises a real-time sampling device and a background monitoring and calculating device of the metal strip assembly line, and the measuring method specifically comprises the following steps of:
s1, establishing a sampling model reference: selecting a support structure with the overall height H in a section of the assembly line, and arranging laser transmitting and receiving units at the upper end A and the lower end A of the structure t Point and A b The point is that the metal strip advances on the assembly line at a constant speed along the arrow direction;
in an ideal state, the upper and lower planes of the strip are in a vertical relation with the laser, and are influenced by vibration generated by movement of the strip, and the upper and lower planes of the strip form an angle theta with a horizontal plane;
s2, determining a sampling data calculation model: from above A t Point vertical incidence laser source, via strip B t After point reflection, by C t Point receiving, wherein the time length from the light source to the light source is t, and the distance from the point A to the point B is the height h t The distance from the point A to the point C is the deviation radius r t Then:
distance L travelled by light t ＝C×T t C is the speed of light;
the relationship exists: r is (r) t 2 +h t 2 ＝(L t -h t ) 2 ；
Height of then
From below A b Point vertical incidence laser source, via strip B b After point reflection, by C b Point receiving, wherein the time length from the light source to the light source is t, and the distance from the point A to the point B is the height h b The distance from the point A to the point C is the deviation radius r b
Thus, the metal strip thickness d=h-H t -h b ；
S3, determining a measurement offset: when the metal strip is transported, vibration causes the plane of the strip to generate horizontal angle deviation theta, and when light is reflected, reflection offset is generated: r=h×tan2θ;
s4, determining a light source receiving device: the light source receiving device is designed to cover the offset range, and the radius of the lens is preferably larger than or equal to r.
As a further scheme of the invention: the height H in step S2 is designed to be 2.5-3.5 m, the light speed is about 3X 108m/S, and the electronic circuit of the ranging sensor must be able to distinguish the following very short time in order to achieve a resolution of 1 mm: 0.001 m/(3×108 m/s) =3ps, to distinguish the time of 3ps, the existing laser displacement sensor skillfully avoids the obstacle, achieves 1mm resolution by using a statistical principle, namely an average rule, can ensure response speed, and the laser displacement sensor designed according to the principle can enable measurement accuracy to reach 1 μm in a range of 2m, thereby meeting production requirements.
As a further scheme of the invention: the vibration in step S3 causes the strip plane to undergo a range determination of horizontal angular offset θ: when the conveyor belt works, vibration of the metal strip is mainly caused by resultant force action of rolling friction force of the rotating shaft and self gravity of the strip, and when the length of the suspended strip is shorter, the vibration range is minimum.
Compared with the prior art, the invention has the beneficial effects that:
(1) The flow line thickness detection method of the metal strip is different from the existing method of manual measurement, and realizes real-time detection in the production process of the metal strip through an automatic means and data analysis and calculation;
(2) According to the thickness detection method, a novel measurement mode is provided, and the measurement accuracy can be effectively improved by synchronously measuring the upper plane and the lower plane and combining with dynamic correction of vibration deviation angle data.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate the invention and together with the embodiments of the invention, serve to explain the invention.
FIG. 1 is a flow chart of a method for measuring thickness of a metal strip in-line process according to the present invention;
FIG. 2 is a schematic view of the upper and lower planes of the belt material in the present embodiment forming an angle θ with the horizontal plane;
fig. 3 is a schematic diagram of the occurrence of the horizontal angle offset θ in the present embodiment.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments.
Examples
Referring to fig. 1-3, a method for measuring thickness of a metal strip line is implemented by an automatic metal strip thickness detection system, wherein the automatic metal strip thickness detection system comprises a real-time sampling device and a background monitoring and calculating device of the metal strip line, and the method specifically comprises the following steps:
first, a sampling model reference is established: referring to fig. 2, a support structure with an overall height H is selected from a pipeline, and laser transmitting and receiving units are disposed at upper and lower ends a of the support structure t Point and A b The point is that the metal strip advances on the assembly line at a constant speed along the arrow direction;
in an ideal state, the upper and lower planes of the strip are in a vertical relation with the laser, and are influenced by vibration generated by movement of the strip, and the upper and lower planes of the strip form an angle theta with a horizontal plane;
in order to reduce the vibration angle of the strip as much as possible, the measuring section is reduced, and three sections of 0.2m, 0.5m and 1m are provided with driving rollers for testing.
Secondly, determining a sampling data calculation model: from above A t Point vertical incidence laser source, via strip B t After point reflection, by C t Point receiving, wherein the time length from the light source to the light source is t, and the distance from the point A to the point B is the height h t The distance from the point A to the point C is the deviation radius r t Then:
distance L travelled by light t ＝C×T t C is the speed of light;
the relationship exists: r is (r) t 2 +h t 2 ＝(L t -h t ) 2 ；
Height of then
From below A b Point vertical incidence laser source, via strip B b After point reflection, by C b Point receiving, wherein the time length from the light source to the light source is t, and the distance from the point A to the point B is the height h b The distance from the point A to the point C is the deviation radius r b
Height of then
Thus, the metal strip thickness d=h-H t -h b ；
In this embodiment, the height H is designed to be 2.5-3.5 m, the light speed is about 3×108m/s, and in order to achieve a resolution of 1mm, the electronic circuit of the ranging sensor must be able to distinguish the following extremely short time: 0.001 m/(3×108 m/s) =3ps, to distinguish the time of 3ps, the existing laser displacement sensor skillfully avoids the obstacle, achieves 1mm resolution by using a statistical principle, namely an average rule, can ensure response speed, and the laser displacement sensor designed according to the principle can enable measurement accuracy to reach 1 μm in a range of 2m, thereby meeting production requirements.
Then, the measurement offset is determined: referring to fig. 3, when the metal strip is transported, vibration causes a horizontal angle shift θ of the plane of the strip, and when light is reflected, a reflection shift amount is generated: r=h×tan2 θ, determining a suitable horizontal angular offset θ range by adjusting the configured driven rollers;
the vibration may cause the plane of the strip to be shifted by a horizontal angle, and the range of the horizontal angle shift θ is specifically defined as: when the conveyor belt works, vibration of the metal strip is mainly caused by resultant force action of rolling friction force of the rotating shaft and self gravity of the strip, and when the length of the suspended strip is shorter, the vibration range is minimum.
Finally, determining a light source receiving device: the light source receiving device is designed to cover the offset range, and the radius of the lens is preferably larger than or equal to r; when the metal strip is produced, the measuring device measures the thickness of the strip in real time, and the data is sampled to the production management end.
In summary, the method for detecting the thickness of the metal strip in the assembly line is different from the existing method of manual measurement, and realizes real-time detection in the production process of the metal strip through an automatic means and data analysis and calculation; by providing a new measurement mode, the measurement accuracy can be effectively improved by synchronously measuring the upper plane and the lower plane and combining the dynamic correction of vibration deviation angle data.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (3)
1. The thickness measuring method of the metal strip assembly line is implemented by a metal strip thickness automatic detection system, and the metal strip thickness automatic detection system comprises a real-time sampling device and a background monitoring and calculating device of the metal strip assembly line, and is characterized by comprising the following steps of:
s1, establishing a sampling model reference: selecting a support structure with the overall height H in a section of the assembly line, and arranging laser transmitting and receiving units at the upper end A and the lower end A of the structure t Point and A b The point is that the metal strip advances on the assembly line at a constant speed along the arrow direction;
in an ideal state, the upper and lower planes of the strip are in a vertical relation with the laser, and are influenced by vibration generated by movement of the strip, and the upper and lower planes of the strip form an angle theta with a horizontal plane;
s2, determining a sampling data calculation model: from above A t Point vertical incidence laser source, via strip B t After point reflection, by C t Point receiving, wherein the time length from the light source to the light source is t, and the distance from the point A to the point B is the height h t The distance from the point A to the point C is the deviation radius r t Then:
distance L travelled by light t ＝C×T t C is the speed of light;
the relationship exists: r is (r) t 2 +h t 2 ＝(L t -h t ) 2 ；
Height of then
From below A b Point vertical incidence laser source, via strip B b After point reflection, by C b Point receiving, wherein the time length from the light source to the light source is t, and the distance from the point A to the point B is the height h b The distance from the point A to the point C is the deviation radius r b
Height of then
Thus, the metal strip thickness d=h-H t -h b ；
S3, determining a measurement offset: when the metal strip is transported, vibration causes the plane of the strip to generate horizontal angle deviation theta, and when light is reflected, reflection offset is generated: r=h×tan2θ;
s4, determining a light source receiving device: the light source receiving device is designed to cover the offset range, and the radius of the lens is preferably larger than or equal to r.
2. The method according to claim 1, wherein the height H in step S2 is designed to be 2.5-3.5 m, the speed of light is about 3 x 108m/S, and the electronic circuit of the distance measuring sensor must be able to distinguish the following very short time for the resolution to be 1 mm: 0.001 m/(3×108 m/s) =3ps, to distinguish the time of 3ps, the existing laser displacement sensor skillfully avoids the obstacle, achieves 1mm resolution by using a statistical principle, namely an average rule, can ensure response speed, and the laser displacement sensor designed according to the principle can enable measurement accuracy to reach 1 μm in a range of 2m, thereby meeting production requirements.
3. A method of thickness measurement of a metal strip line according to claim 1, wherein the vibration in step S3 causes a determination of the extent to which the strip plane is horizontally angularly offset θ: when the conveyor belt works, vibration of the metal strip is mainly caused by resultant force action of rolling friction force of the rotating shaft and self gravity of the strip, and when the length of the suspended strip is shorter, the vibration range is minimum.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310489275.5A CN116428993A (en) | 2023-04-28 | 2023-04-28 | Thickness measuring method for metal strip assembly line |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310489275.5A CN116428993A (en) | 2023-04-28 | 2023-04-28 | Thickness measuring method for metal strip assembly line |
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