CN111044004A - Pipeline surface smoothness detection method - Google Patents
Pipeline surface smoothness detection method Download PDFInfo
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- CN111044004A CN111044004A CN201911392070.5A CN201911392070A CN111044004A CN 111044004 A CN111044004 A CN 111044004A CN 201911392070 A CN201911392070 A CN 201911392070A CN 111044004 A CN111044004 A CN 111044004A
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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
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/30—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring roughness or irregularity of surfaces
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Abstract
The invention discloses a method for detecting the smoothness of the surface of a pipeline, which comprises the following steps: arranging a fixed measuring scale at an outlet of the pipeline extruder, establishing a space coordinate system, and taking a contact point during pipeline extrusion as a space coordinate origin; collecting coordinates of discrete points of the first section; taking a point every d millimeters in the set axial direction; taking three discrete points on the first section according to the point taking mode of the step S2, and simultaneously calculating an equation of a circle where the section is located; taking other discrete points on the first section, calculating the distance from the discrete points to the circle, making a difference between the calculated distance and the radius of the circle, and comparing the difference with a precision threshold range to judge the smoothness degree of the surface of the pipeline; and repeating the steps along with the movement of the pipeline to detect the surface smoothness of the whole pipeline to be detected. The invention has the advantages of high accuracy, good stability and simple operation.
Description
Technical Field
The invention relates to the field of pipeline detection, in particular to a method for detecting the smoothness of a pipeline surface.
Background
In the production process of pipeline related products, the surface smoothness is an important production index. The smoothness of the pipe surface affects the resistance to movement of the fluid (including water, air, oil, etc.) within the pipe elements. The smooth surface significantly reduces the frictional resistance to flow, thereby reducing flow losses. Meanwhile, the friction of the pipeline pipe fitting is reduced, the noise is reduced, and the friction heating of the fluid and the pipeline pipe fitting is also obviously reduced. The smoothness meeting the specification requirement can obviously improve the performance of the pipeline pipe fitting and enhance the market competitiveness of the product.
The current method for detecting the smoothness of the surface of the pipeline product comprises the following steps: the simplest method is visual detection, but the detection method has low precision and is unstable; the optical detection method does not need to directly contact with a pipeline, is convenient to use, but has limited precision; the mechanical detection method has low precision, and the use convenience degree is related to various mechanical schemes.
Disclosure of Invention
The invention provides a method for detecting the smoothness of the surface of a pipeline, aiming at overcoming the defects of low detection precision and instability of the smoothness of the surface of the pipeline in the prior art.
The present invention aims to solve the above technical problem at least to some extent.
The primary objective of the present invention is to solve the above technical problems, and the technical solution of the present invention is as follows:
a method for detecting the smoothness of the surface of a pipeline comprises the following steps:
s1: arranging a fixed measuring scale at an outlet of the pipeline extruder, establishing a space coordinate system, and taking a contact point during pipeline extrusion as a space coordinate origin;
s2: collecting coordinates of discrete points of the first section; taking a point every d millimeters in the set axial direction, wherein d is greater than 0;
s3: taking three discrete points on the first section according to the point taking mode of the step S2, and simultaneously calculating an equation of a circle where the section is located;
s4: taking other discrete points on the first section, calculating the distance from the discrete points to the circle, and making a difference between the calculated distance and the radius of the circle; if the difference value is within the preset precision threshold value range, judging that the discrete point is on the circle; if the difference value is not within the precision threshold range, further confirming whether the distance from the discrete point to the circle is larger than the radius of the circle, and if the distance from the discrete point to the circle is larger than the radius of the circle, sinking the pipeline corresponding to the discrete point; if the distance from the discrete point to the circle is smaller than the radius of the circle, the pipeline corresponding to the discrete point is convex;
s5: and repeating the steps S2-S4 to detect the surface smoothness of the whole pipeline to be detected along with the movement of the pipeline.
Further, the number of the selected points in the step S2 is adjusted according to the size of the pipe diameter to be measured.
Further, the round equation calculation process of step S3 is as follows: respectively bringing the three discrete points into a standard equation of a circle;
(x1-m)2+(y1-n)2＝r2
(x2-m)2+(y2-n)2＝r2
(x3-m)2+(y3-n)2＝r2
wherein (x)1,y1),(x2,y2),(x3,y3) Three discrete points are used, m and n are coordinates of the circle center, r is the radius of the circle, the three discrete points are known quantities, the circle center and the radius are unknown quantities, and the equations of the three discrete points are collated to obtain the equation of the circle described according to the known quantities of the three discrete points, which is concretely as follows:
wherein, a, b, c, d, e, f are equation description parameters of the circle, which are specifically as follows:
a＝2x3-2x2；b＝2y3-2y2；
e＝2x2-2x1；f＝2y2-2y1；
the circle center coordinates m, n are expressed as follows:
further, the step S4 of calculating the distance from the discrete point to the circle uses the following formula:
wherein, (x, y) is the coordinate of the discrete point to be measured of the cross section, and D is the distance from the discrete point to the circle.
Further, step S2 sets the Z axis as the fixed axis at the fixed axial orientation.
Compared with the prior art, the technical scheme of the invention has the beneficial effects that:
the method comprises the steps of calculating an equation of a circle where a cross section is located by taking a discrete point from the cross section of the pipeline through fixing a measuring scale and establishing a coordinate system, and comparing the distance from the discrete point to the circle with the radius of the circle to judge the smoothness of the surface of the pipeline; the invention has the advantages of high accuracy, good stability and simple operation.
Drawings
FIG. 1 is a process flow diagram.
Fig. 2 is a schematic view of a pipeline measurement process.
Detailed Description
The technical solution of the present invention is further described below with reference to the accompanying drawings and examples.
Example 1
As shown in fig. 1, a method for detecting the smoothness of a pipeline surface includes the following steps:
s1: arranging a fixed measuring scale at an outlet of the pipeline extruder, establishing a space coordinate system, and taking a contact point during pipeline extrusion as a space coordinate origin;
s2: collecting coordinates of discrete points of the first section; taking a point every d millimeters in the set axial direction, wherein d is greater than 0; the selected quantity is adjusted according to the size of the pipe diameter to be measured.
S3: taking three discrete points on the first section according to the point taking mode of the step S2, and simultaneously calculating an equation of a circle where the section is located;
the process of calculating the circular equation in step S3 is as follows: the three discrete points are respectively substituted into a standard equation of a circle, which is expressed as follows;
(x1-m)2+(y1-n)2＝r2
(x2-m)2+(y2-n)2＝r2
(x3-m)2+(y3-n)2＝r2
wherein (x)1,y1),(x2,y2),(x3,y3) The method comprises the following steps of sorting three discrete points, wherein m and n are coordinates of a circle center, r is a radius of a circle, the three discrete points are known quantities, the circle center and the radius are unknown quantities, and obtaining an equation of the circle described according to the three known quantities, wherein the equation comprises the following specific steps:
wherein, a, b, c, d, e, f are equation description parameters of the circle, which are specifically as follows:
a＝2x3-2x2；b＝2y3-2y2；
e＝2x2-2x1；f＝2y2-2y1；
the circle center coordinates m, n are expressed as follows:
s4: taking other discrete points on the first section, calculating the distance from the discrete points to the circle, and making a difference between the calculated distance and the radius of the circle; if the difference value is within the preset precision threshold value range, judging that the discrete point is on the circle; if the difference value is not within the precision threshold range, further confirming whether the distance from the discrete point to the circle is larger than the radius of the circle, and if the distance from the discrete point to the circle is larger than the radius of the circle, sinking the pipeline corresponding to the discrete point; if the distance from the discrete point to the circle is smaller than the radius of the circle, the pipeline corresponding to the discrete point is convex;
the distance from the discrete point to the circle is calculated using the following formula:
wherein, (x, y) is the coordinate of the discrete point to be measured of the cross section, and D is the distance from the discrete point to the circle.
S5: and repeating the steps S2-S4 to detect the surface smoothness of the whole pipeline to be detected along with the movement of the pipeline.
In this embodiment, step S2 sets the Z axis as the fixed axis at the fixed axial alignment point.
The invention adopts a computer to carry out program control, simultaneously carries out the calculation of all the following sections (as shown in figure 2) along with the movement of the pipe, and can complete the calculation and measurement of the smoothness degree of the whole pipeline in a short time.
The same or similar reference numerals correspond to the same or similar parts;
the terms describing positional relationships in the drawings are for illustrative purposes only and are not to be construed as limiting the patent;
it should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (5)
1. A method for detecting the smoothness of the surface of a pipeline is characterized by comprising the following steps:
s1: arranging a fixed measuring scale at an outlet of the pipeline extruder, establishing a space coordinate system, and taking a contact point during pipeline extrusion as a space coordinate origin;
s2: collecting coordinates of discrete points of the first section; taking a point every d millimeters in the set axial direction, wherein d is greater than 0;
s3: taking three discrete points on the first section according to the point taking mode of the step S2, and simultaneously calculating an equation of a circle where the section is located;
s4: taking other discrete points on the first section, calculating the distance from the discrete points to the circle, and making a difference between the calculated distance and the radius of the circle; if the difference value is within the preset precision threshold value range, judging that the discrete point is on the circle; if the difference value is not within the precision threshold range, further confirming whether the distance from the discrete point to the circle is larger than the radius of the circle, and if the distance from the discrete point to the circle is larger than the radius of the circle, sinking the pipeline corresponding to the discrete point; if the distance from the discrete point to the circle is smaller than the radius of the circle, the pipeline corresponding to the discrete point is convex;
s5: and repeating the steps S2-S4 to detect the surface smoothness of the whole pipeline to be detected along with the movement of the pipeline.
2. The method for detecting the smoothness of the surface of the pipeline as claimed in claim 1, wherein the number of the selected points in step S2 is adjusted according to the diameter of the pipe to be measured.
3. The method for detecting the degree of smoothness of the surface of the pipeline as claimed in claim 1, wherein the step S3 is implemented by calculating a circular equation as follows: the three discrete points are respectively substituted into a standard equation of a circle, which is expressed as follows;
(x1-m)2+(y1-n)2＝r2
(x2-m)2+(y2-n)2＝r2
(x3-m)2+(y3-n)2＝r2
wherein (x)1,y1),(x2,y2),(x3,y3) Three discrete points are used, m and n are coordinates of the circle center, r is the radius of the circle, the three discrete points are known quantities, the circle center and the radius are unknown quantities, and the equations of the three discrete points are collated to obtain the equation of the circle described according to the known quantities of the three discrete points, which is concretely as follows:
wherein, a, b, c, d, e, f are equation description parameters of the circle, which are specifically as follows:
a＝2x3-2x2；b＝2y3-2y2；
e＝2x2-2x1；f＝2y2-2y1；
the circle center coordinates m, n are expressed as follows:
4. the method for detecting the smoothness of the surface of a pipeline as claimed in any one of claims 1 to 3, wherein the step S4 is implemented by calculating the distance from the discrete point to the circle using the following formula:
wherein, (x, y) is the coordinate of the discrete point to be measured of the cross section, and D is the distance from the discrete point to the circle.
5. The method of claim 1, wherein step S2 is performed with the Z axis as a fixed axis at a fixed axial orientation.
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| CN103308021A (en) * | 2013-07-04 | 2013-09-18 | 沈阳工业大学 | Method for measuring roundness error of workpiece |
| JP2015175761A (en) * | 2014-03-17 | 2015-10-05 | 株式会社神戸製鋼所 | Surface flaw detection method and surface flaw detection device |
| CN107664483A (en) * | 2016-07-29 | 2018-02-06 | 宝山钢铁股份有限公司 | A kind of cylinder bar shape parameter measurement method |
| CN107869957A (en) * | 2016-09-27 | 2018-04-03 | 宝山钢铁股份有限公司 | A kind of cylindrical cross-section dimension measuring device and method based on imaging system |
| CN207300126U (en) * | 2017-06-29 | 2018-05-01 | 慈溪汇丽机电股份有限公司 | A kind of three sections of arc check tools |
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2019
- 2019-12-30 CN CN201911392070.5A patent/CN111044004A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102661699A (en) * | 2012-05-15 | 2012-09-12 | 贵州红湖发动机零部件有限公司 | Precision measurement method of large-radius short arc part |
| CN103308021A (en) * | 2013-07-04 | 2013-09-18 | 沈阳工业大学 | Method for measuring roundness error of workpiece |
| JP2015175761A (en) * | 2014-03-17 | 2015-10-05 | 株式会社神戸製鋼所 | Surface flaw detection method and surface flaw detection device |
| CN107664483A (en) * | 2016-07-29 | 2018-02-06 | 宝山钢铁股份有限公司 | A kind of cylinder bar shape parameter measurement method |
| CN107869957A (en) * | 2016-09-27 | 2018-04-03 | 宝山钢铁股份有限公司 | A kind of cylindrical cross-section dimension measuring device and method based on imaging system |
| CN207300126U (en) * | 2017-06-29 | 2018-05-01 | 慈溪汇丽机电股份有限公司 | A kind of three sections of arc check tools |
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Application publication date: 20200421 |