CN113029011B - Calibrating method and calibrating device for measuring thickness of pipe wall of pipe - Google Patents

Calibrating method and calibrating device for measuring thickness of pipe wall of pipe Download PDF

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CN113029011B
CN113029011B CN202110297987.8A CN202110297987A CN113029011B CN 113029011 B CN113029011 B CN 113029011B CN 202110297987 A CN202110297987 A CN 202110297987A CN 113029011 B CN113029011 B CN 113029011B
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pipe
optical sensor
wall thickness
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wall
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CN113029011A (en
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张翼飞
罗锡阳
曹永磊
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Guangzhou Sealion Software Technology Co ltd
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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
    • G01B11/002—Measuring arrangements characterised by the use of optical techniques for measuring two or more coordinates
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E30/00—Energy generation of nuclear origin
    • Y02E30/30—Nuclear fission reactors

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  • General Physics & Mathematics (AREA)
  • Length Measuring Devices By Optical Means (AREA)

Abstract

The invention discloses a calibrating method and a calibrating device for measuring the thickness of a pipe wall of a pipe, wherein the calibrating method comprises the following steps: a: calculating the pipe wall thickness C1 of the pipe according to the data measured by the optical sensor A positioned at the center of the circle and the optical sensor R positioned on the circumference; b: calculating and obtaining the center coordinates B (X, Y) of the pipe; c: calculating the actual inner diameter of the pipe according to the obtained center coordinates B (X, Y); d: calculating the actual pipe wall thickness wall1 of the pipe in the AR direction according to the actual outer diameter and the actual inner diameter of the pipe; e: the wall thickness C1 of the pipe is compared with the actual wall thickness wall1, and the wall thickness of the pipe is calibrated. The invention can calibrate the thickness of the pipe wall of the pipe, so that the measured data is more accurate.

Description

Calibrating method and calibrating device for measuring thickness of pipe wall of pipe
Technical Field
The invention relates to the field of pipe measurement, in particular to a method and a device for calibrating pipe wall thickness measurement.
Background
After the plastic pipe is produced, in order to ensure that the produced pipe meets the requirements, a measuring tool is usually required to measure the pipe wall thickness and the like of the pipe. The existing measuring device for the wall thickness of the pipe generally adopts an optical sensor to measure the wall thickness of the round pipe. When the measuring device is used for measuring the pipe wall thickness of the pipe, the requirement on the placement position of the pipe is high, and if the center of the pipe is deviated, the error exists in the measured data.
Disclosure of Invention
The invention aims to provide a calibrating method and a calibrating device for measuring the pipe wall thickness of a pipe.
The technical scheme is as follows:
the invention discloses a calibrating method for measuring the thickness of a pipe wall of a pipe in an embodiment.
The calibration method comprises the following steps:
a: calculating the pipe wall thickness C1 of the pipe according to the data measured by the optical sensor A positioned at the center of the circle and the optical sensor R positioned on the circumference;
b: calculating and obtaining the center coordinates B (X, Y) of the pipe;
c: calculating the actual inner diameter of the pipe according to the obtained center coordinates B (X, Y);
d: calculating the actual pipe wall thickness wall1 of the pipe in the AR direction according to the actual outer diameter and the actual inner diameter of the pipe;
e: the wall thickness C1 of the pipe is compared with the actual wall thickness wall1, and the wall thickness of the pipe is calibrated.
Further, in the step a, calculating the wall thickness C1 of the pipe specifically includes:
C1＝AR-RD-AK；
wherein AR is the distance from the optical sensor a to the optical sensor R; RD is the distance from the optical sensor R to the point D of the outer wall of the pipe; AK is the distance from the optical sensor a to the K point of the inner wall of the pipe.
Further, the step B specifically comprises the following steps:
coordinates of Y axis: y= (SP-RD)/2;
coordinates of X axis: x= (NL-QG)/2;
the SP is the distance between the SP and the point P of the outer wall of the pipe, which is measured by an optical sensor S, and the optical sensor S and an optical sensor R are arranged in a vertically opposite manner on the circumference;
NL is the distance from the optical sensor N to the L point of the outer wall of the pipe; QG is the distance from the optical sensor Q to the outer wall G point of the pipe; the optical sensor N and the optical sensor Q are arranged opposite to each other on the circumference.
Further, in step C, the following steps are included:
according to the obtained center coordinates B (X, Y), calculating a cosine value COS alpha of an included angle alpha between the line segment DA and the line segment AB;
calculating the actual wall thickness wall1 of the pipe according to COS alpha;
the line segment DA is a connecting line between a point D on the outer wall of the pipe and the circle center where the optical sensor A is located, and the line segment AB is a connecting line between the circle center where the optical sensor A is located and the circular coordinate B (X, Y) of the pipe.
Further, according to the obtained center coordinates B (X, Y), a cosine value COS α of the angle α between the line segment DA and the line segment AB is calculated, which specifically includes:
line segment DA, line segment AB, line segment BD enclose a triangle in which:
Figure BDA0002985033420000031
DA＝AR-RD；
BD = tubing outer diameter/2;
COSα＝(AB^2+AD^2-BD^2)/2*AB*AD；
the line segment BD is a connecting line from the point D on the outer wall of the pipe to the center coordinates B (X, Y) of the pipe.
Further, calculating the actual wall thickness wall1 of the pipe according to COS alpha specifically comprises the following steps:
the line segments AK, AB, BK enclose a triangle in which:
Figure BDA0002985033420000032
BK^2＝AK^2+AB^2-2*AK*AB*COSα；
Figure BDA0002985033420000041
wall1 = pipe actual outer diameter-r;
the line segment BK is a connecting line from the circle center B (X, Y) of the pipe to a K point on the inner diameter of the pipe; r is the inner diameter radius of the pipe.
Further, before step E, the method further includes:
and calculating the actual pipe wall thickness wall2 of the pipe in the other directions different from the AR direction, and judging whether the actual pipe wall thickness wall1 is the same as the actual pipe wall thickness wall 2.
The invention also discloses a calibrating device for measuring the thickness of the pipe wall of the pipe in another embodiment, which comprises an optical sensor A, an optical sensor R, an optical sensor Q, an optical sensor S and an optical sensor N; the optical sensor R, the optical sensor Q, the optical sensor S and the optical sensor N enclose a circle, the optical sensor R, the optical sensor Q, the optical sensor S and the optical sensor N are respectively and uniformly distributed on the circumference of the circle, the optical sensor R, the optical sensor Q, the optical sensor S and the optical sensor N point to the outer wall of the pipe respectively, the optical sensor A is positioned on the circle center of the circle, and the optical sensor A points to the inner wall of the pipe.
Further, the center of the pipe coincides with the center of the circle; or the center of the pipe is offset relative to the center of the circle.
Further, the optical sensor R, the optical sensor Q, the optical sensor S and the optical sensor N are respectively positioned on the outer side of the outer wall of the pipe, and the optical sensor A is positioned in the pipe.
The advantages and principles of the invention are described below:
when the calibrating device is used for calibrating the pipe wall thickness of the pipe, the pipe wall thickness C1 of the pipe is calculated according to the data measured by the optical sensor. The wall thickness C1 is equal or unequal to the actual wall thickness wall1 of the pipe. And then obtaining the center coordinates B (X, Y) of the pipe, calculating the actual inner diameter of the pipe according to the obtained center coordinates B (X, Y), and then obtaining the actual wall thickness wall1 of the pipe according to the actual outer diameter and the actual inner diameter of the pipe. The actual pipe wall thickness wall1 is equal to or unequal to the pipe wall thickness C1, if the pipe wall thickness C1 is equal to the actual pipe wall thickness wall1, the center of the pipe coincides with the circle center of the circle, and if the pipe wall thickness C1 is unequal to the actual pipe wall thickness wall1, the center of the pipe is offset relative to the circle center of the circle. According to the invention, the pipe wall thickness of the pipe is calibrated, so that errors of the measured pipe wall thickness of the pipe are prevented, and the measured data of the pipe wall thickness of the pipe is more accurate.
Drawings
FIG. 1 is a schematic diagram of a calibration device according to an embodiment of the present invention;
fig. 2 is a general flow chart of a calibration method of an embodiment of the present invention.
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making clear and defining the scope of the present invention.
As shown in fig. 1, the present embodiment discloses a calibrating device for measuring the thickness of a pipe wall, which includes an optical sensor a, an optical sensor R, an optical sensor Q, an optical sensor S, and an optical sensor N. The optical sensor R, the optical sensor Q, the optical sensor S and the optical sensor N are respectively and uniformly distributed on the circumference of the circle, and the optical sensor R, the optical sensor Q, the optical sensor S and the optical sensor N are respectively directed to the outer wall of the pipe. The optical sensor A is positioned on the center of the circle, and is directed to the inner wall of the pipe. The optical sensor R, the optical sensor Q, the optical sensor S and the optical sensor N are respectively positioned on the outer side of the outer wall of the pipe, and the optical sensor A is positioned in the pipe.
When the calibrating device is used for measuring the thickness of the pipe wall of the pipe, the center of the pipe is coincident with the circle center of the circle, or the center of the pipe is offset relative to the circle center of the circle. If the center of the pipe coincides with the circle center of the circle, the measured pipe wall thickness of the pipe is accurate, and if the center of the pipe deviates from the circle center of the circle, the measured pipe wall thickness data of the pipe deviate.
In order to prevent deviation of the measured data of the wall thickness of the pipe, as shown in fig. 2, the calibration method of the calibration device comprises the following steps:
a: and calculating the wall thickness C1 of the pipe according to the data measured by the optical sensor A positioned at the center of the circle and the optical sensor R positioned on the circumference.
When the thickness of the pipe wall of the pipe is measured and calibrated, the center of the pipe and the circle center may coincide, and the center of the pipe may deviate from the circle center.
B: and calculating and obtaining the center coordinates B (X, Y) of the pipe.
The obtained circle center coordinates B (X, Y) of the pipe are the same as or different from the circle center of a circle surrounded by a plurality of optical sensors, and the circle center coordinates of the circle surrounded by the optical sensors are set to be (0, 0).
C: and calculating the actual wall thickness of the pipe according to the obtained center coordinates B (X, Y).
The actual outer diameter of the pipe is known when the pipe is produced, and in the case that the actual outer diameter of the pipe is known, the actual inner diameter of the pipe is obtained only by calculation.
D: and calculating the actual pipe wall thickness wall1 of the pipe in the AR direction according to the actual outer diameter and the actual inner diameter of the pipe.
Under the condition that the data of the actual inner diameter and the actual outer diameter of the pipe are accurate, the difference value between the actual outer diameter of the pipe and the actual inner diameter of the pipe is the accurate value of the actual pipe wall thickness wall1 of the pipe.
E: the wall thickness C1 of the pipe is compared with the actual wall thickness wall1, and the wall thickness of the pipe is calibrated.
The value of the wall thickness C1 may or may not be equal to the value of the actual wall thickness wall1. Under the condition that the center of the pipe coincides with the center of the circle, the value of the pipe wall thickness C1 is equal to the value of the actual pipe wall thickness wall1; in the case that the center of the pipe is offset from the center of the pipe, the value of the pipe wall thickness C1 is not equal to the value of the actual pipe wall thickness wall1, and the value of the pipe wall thickness C1 is often greater than the value of the actual pipe wall thickness wall1.
In the calibration method of the embodiment, the measured pipe thickness is calibrated through calculation of the actual pipe wall thickness wall1, so that measurement errors are avoided.
In step a, calculating the wall thickness C1 of the pipe specifically includes:
C1＝AR-RD-AK；
wherein AR is a distance from the optical sensor a to the optical sensor R, which is fixed when the optical sensor a and the optical sensor R are mounted, and which is known data. RD is the distance from the optical sensor R to the point D of the outer wall of the pipe; AK is the distance from the optical sensor a to the K point of the inner wall of the pipe. In this embodiment, the pipe wall thickness C1 can be calculated by the optical sensor a and the optical sensor R.
In the step B, calculating and acquiring the center coordinates B (X, Y) of the pipe specifically comprises the following steps:
coordinates of Y axis: y= (SP-RD)/2;
coordinates of X axis: x= (NL-QG)/2;
the SP is the distance between the SP and the point P of the outer wall of the pipe, which is measured by the optical sensor S, and the optical sensor S and the optical sensor R are arranged in a vertically opposite manner on the circumference. NL is the distance from the optical sensor N to the L point of the outer wall of the pipe; QG is the distance from the optical sensor Q to the outer wall G point of the pipe; the optical sensor N and the optical sensor Q are arranged opposite to each other on the circumference.
Further, under the condition that the center coordinates B (X, Y) of the pipe are obtained, the actual pipe wall thickness wall1 of the pipe can be calculated, and the calculating of the actual pipe wall thickness wall1 of the pipe specifically comprises the following steps:
according to the obtained center coordinates B (X, Y), calculating a cosine value COS alpha of an included angle alpha between the line segment DA and the line segment AB;
the actual wall thickness wall1 of the pipe is calculated from COS α.
The line segment DA is a connecting line between a point D on the outer wall of the pipe and the circle center where the optical sensor A is located, and the line segment AB is a connecting line from the circle center where the optical sensor A is located to the circle center coordinate B (X, Y) of the pipe.
As shown in the figure, the line segment DA, the line segment AB, and the line segment BD enclose a triangle, and in the triangle ABD:
Figure BDA0002985033420000091
DA＝AR-RD；
BD = tubing outer diameter/2;
then COS α= (AB 2+ ad 2-BD 2)/2 AB ad according to the cosine theorem;
the line segment BD is a connecting line from the point D on the outer wall of the pipe to the center coordinates B (X, Y) of the pipe.
As shown in the figure, the line segments AK, AB and BK enclose a triangle, and in the triangle ABK, since COS α is known, the actual wall thickness of the pipe can be further calculated, which specifically includes the following steps:
Figure BDA0002985033420000092
BK^2＝AK^2+AB^2-2*AK*AB*COSα；
Figure BDA0002985033420000093
/>
wall1 = pipe actual outer diameter-r;
the line segment BK is a connecting line from the circle center B (X, Y) of the pipe to a K point on the inner diameter of the pipe; r is the inner diameter radius of the pipe, the actual pipe wall thickness wall1 of the pipe can be obtained by subtracting the inner diameter of the pipe from the actual outer diameter of the pipe, and the thickness of the pipe is calibrated according to the actual pipe wall thickness wall1.
In order to make the calibrated data more accurate, the thickness of the pipe wall of the pipe in other directions can be calculated by the above calibration method. For example: the actual pipe wall thickness wall2 of the pipe in the AQ direction can be calculated, and then the actual pipe wall thickness wall1 is compared with the actual pipe wall thickness wall2 to confirm whether the calculated data are correct or not. And verifying and calibrating the wall thickness of the pipe through a plurality of data obtained through calculation, so that the wall thickness measurement of the pipe is more accurate. Meanwhile, after the pipe wall thickness of the pipe is calibrated by the calibration method, the requirements on centering and positioning of the pipe in measurement are reduced, and the pipe production and measurement are facilitated.
The embodiments of the present invention are not limited thereto, and the present invention may be modified, substituted or combined in various other forms without departing from the basic technical spirit of the present invention, which falls within the scope of the claims, according to the above-described aspects of the present invention, using the general knowledge and conventional means of the art.

Claims (2)

1. The calibrating method for the pipe wall thickness measurement is operated on a calibrating device for the pipe wall thickness measurement and is characterized by comprising an optical sensor A, an optical sensor R, an optical sensor Q, an optical sensor S and an optical sensor N; the optical sensor R, the optical sensor Q, the optical sensor S and the optical sensor N are surrounded into a circle, the optical sensor R, the optical sensor Q, the optical sensor S and the optical sensor N are respectively and uniformly distributed on the circumference of the circle, the optical sensor R, the optical sensor Q, the optical sensor S and the optical sensor N are respectively pointed to the outer wall of the pipe, the optical sensor A is positioned on the circle center of the circle, the optical sensor A is pointed to the inner wall of the pipe, the optical sensor R, the optical sensor Q, the optical sensor S and the optical sensor N are respectively positioned on the outer side of the outer wall of the pipe, and the optical sensor A is positioned in the pipe; the optical sensor A is used for ranging along the AR, AQ, AS, AN direction, and the optical sensor R, the optical sensor Q, the optical sensor S and the optical sensor N are respectively used for ranging along the RA, QA, SA, NA direction;
the calibration method comprises the following steps:
a: calculating the pipe wall thickness C1 of the pipe according to the data measured by the optical sensor A positioned at the center of the circle and the optical sensor R positioned on the circumference;
b: calculating and obtaining the center coordinates B (X, Y) of the pipe;
c: calculating the actual inner diameter of the pipe according to the obtained center coordinates B (X, Y);
d: calculating the actual pipe wall thickness wall1 of the pipe in the AR direction according to the actual outer diameter and the actual inner diameter of the pipe;
e: comparing the pipe wall thickness C1 of the pipe with the actual pipe wall thickness wall1, and calibrating the pipe wall thickness of the pipe;
in step a, calculating the wall thickness C1 of the pipe specifically includes:
C1＝AR-RD-AK；
wherein AR is the distance from the optical sensor a to the optical sensor R; RD is the distance from the optical sensor R to the point D of the outer wall of the pipe; AK is the distance between the optical sensor A and the K point of the inner wall of the pipe;
the step B specifically comprises the following steps:
coordinates of Y axis: y= (SP-RD)/2;
coordinates of X axis: x= (NL-QG)/2;
the SP is the distance between the SP and the point P of the outer wall of the pipe, which is measured by an optical sensor S, and the optical sensor S and an optical sensor R are arranged in a vertically opposite manner on the circumference;
NL is the distance from the optical sensor N to the L point of the outer wall of the pipe; QG is the distance from the optical sensor Q to the outer wall G point of the pipe; the optical sensor N and the optical sensor Q are arranged in a left-right opposite manner on the circumference;
in step C, the following steps are included:
according to the obtained center coordinates B (X, Y), calculating a cosine value COS alpha of an included angle alpha between the line segment DA and the line segment AB;
calculating the actual wall thickness wall1 of the pipe according to COS alpha;
the line segment DA is a connecting line between a point D on the outer wall of the pipe and the circle center where the optical sensor A is positioned, and the line segment AB is a connecting line from the circle center where the optical sensor A is positioned to the circular coordinate B (X, Y) of the pipe;
according to the obtained center coordinates B (X, Y), calculating a cosine value COS alpha of an included angle alpha between the line segment DA and the line segment AB, wherein the method specifically comprises the following steps:
line segment DA, line segment AB, line segment BD enclose a triangle in which:
Figure FDA0004139411160000031
DA＝AR-RD；
BD = tubing outer diameter/2;
COSα＝(AB^2+AD^2-BD^2)/2*AB*AD；
the line segment BD is a connecting line from a point D on the outer wall of the pipe to a circle center coordinate B (X, Y) of the pipe;
calculating the actual wall thickness wall1 of the pipe according to COS alpha, wherein the method specifically comprises the following steps:
the line segments AK, AB, BK enclose a triangle in which:
Figure FDA0004139411160000032
BK^2＝AK^2+AB^BK^2＝AK^2+AB^2-2*AK*AB*COSα；
Figure FDA0004139411160000033
wall1 = pipe actual outer diameter-r;
the line segment BK is a connecting line from the circle center B (X, Y) of the pipe to a K point on the inner diameter of the pipe; r is the inner diameter radius of the pipe.
2. The method for calibrating a tube wall thickness measurement according to claim 1, further comprising, prior to step E:
and calculating the actual pipe wall thickness wall2 of the pipe in the other directions different from the AR direction, and judging whether the actual pipe wall thickness wall1 is the same as the actual pipe wall thickness wall 2.
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