CN113267112A - Method for measuring bending angle of induction heating bent pipe - Google Patents
Method for measuring bending angle of induction heating bent pipe Download PDFInfo
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- CN113267112A CN113267112A CN202110335992.3A CN202110335992A CN113267112A CN 113267112 A CN113267112 A CN 113267112A CN 202110335992 A CN202110335992 A CN 202110335992A CN 113267112 A CN113267112 A CN 113267112A
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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
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/24—Measuring arrangements characterised by the use of mechanical techniques for measuring angles or tapers; for testing the alignment of axes
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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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Abstract
The invention relates to a method for measuring bending angle of an induction heating bent pipe, which comprises the steps of placing the bent pipe on a platform, respectively attaching a right-angle side of two right-angle rulers to the platform, enabling the other right-angle side to be tangent to the cambered surface of the bent pipe, then attaching a straight ruler to the surface of the platform, attaching the side surface to the right-angle side, and drawing out an extension line L of straight pipe sections at two ends of the bent pipe along the straight ruler by using a fine talc pen1And L2. And continuously extending for 100-500 mm through intersection of the intersection points A of the two extension lines, framing a triangle by using a rectangular ruler, recording the side length a of the short right-angle side and the side length b of the long right-angle side of the triangle, and calculating the bending angle alpha of the bent pipe by using a trigonometric function. The invention optimizes the measuring steps, can accurately measure the bending angle of the bent pipe, improves the measuring working efficiency and meets the use requirements of the field bent pipe installation process.
Description
Technical Field
The invention belongs to the technical field of industrial measurement, and relates to a method for measuring a bending angle of an induction heating bent pipe.
Background
With the rapid development of economy in China, long-distance pipelines as the most economic, safe and uninterrupted long-distance conveying tools for conveying petroleum and natural gas are greatly developed in the past decade, and the development trend is still continuous in the future. With the increasing laying mileage of the long-distance pipeline, the requirement on the internal performance of the steel pipe for the long-distance pipeline in the industry is continuously improved, and meanwhile, higher requirements on the dimensional accuracy of the steel pipe are also provided.
At present, the measurement method of the bending angle of the elbow with the straight pipe section is usually the measurement method (also called a pay-off measurement method) given in SY/T5257-2012, an angle ruler, a platform, a 2000mm steel plate ruler and a square ruler are used as measurement tools, the elbow is placed on the platform, and then the square ruler is used for respectively finding out N points (N is more than or equal to 6) on the straight pipe sections at the two ends of the elbow and projecting the N points on the platform. And then taking the bent pipe away from the platform, finding out the central lines of the straight pipe sections at two ends according to the points, intersecting the central lines at the point A, and measuring the bending angle alpha of the bent pipe by using an angle ruler or a trigonometric function calculation method.
The main defects of the adoption of the measurement method are as follows: the measuring device has the advantages of various tools, multiple measuring times, large error, far out-of-standard deviation value and incapability of meeting the requirements of standards and installation accuracy. Secondly, the measurement steps are complicated, the working efficiency is low, and the requirement of the production progress cannot be met. The artificial interference factors are more, time and labor are wasted, the measured value is strongly interfered by the artificial factors, different personnel operate the device, and the final measured result is different
Disclosure of Invention
The invention aims to provide a method for measuring the bending angle of an induction heating bent pipe, which optimizes the measuring steps, accurately measures the bending angle of the bent pipe, improves the measuring working efficiency, reduces the human interference factors and the measuring errors and meets the use requirements of the field bent pipe installation process.
The technical scheme of the invention is as follows: a method for measuring the bending angle of induction heating elbow features that the elbow is put on a platform, and the extended lines L of straight segments at both ends of elbow are drawn by two square rulers and straight rulers or drawing rule1And L2The two extension lines are extended by 100-500 mm after crossing through the intersection point A of the extension lines, a triangle is framed by a right-angle ruler, the side length a of a short right-angle side and the side length b of a long right-angle side of the triangle are recorded by a detection ruler, and the bending angle alpha of the bent pipe is calculated by a trigonometric function; the calculation formula of the bending angle alpha of the bent pipe is as follows:
α＝arctan(a/b)
wherein: alpha is the bending angle of the bent pipe, degree; a is the length of the short right-angle side, mm; and b is the length of the long right-angle side, which is mm.
The process of drawing the extension lines of the straight pipe sections at the two ends of the elbow pipe by using the two square rulers is as follows:
the bending method includes the steps that a right-angle edge of each of two right-angle rulers is attached to a platform, the other right-angle edge of each right-angle ruler abuts against the outer arc side of a bent pipe and is tangent to the arc surface of the bent pipe, and the distance between the two right-angle rulers is 200-300 mm;
a plane of the ruler is attached to the platform surface, the side faces of the ruler are attached to two parallel vertical right-angle edges, and the fine talc strokes form a No. 1 extending straight line L along the ruler1Marking out No. 2 extension straight line L of straight pipe section at the other end of the elbow pipe by the same method2(ii) a Or marking drawing points at the vertexes of two squares (two sides), connecting the two drawing points in series by using a straight ruler, and drawing a No. 1 extension straight line L1And No. 2 extended straight line L2。
With marking rules for both ends of the bendThe process of the straight pipe section extension line is as follows: horizontally placing the marking ruler on the platform, attaching the straight ruler and the transverse ruler of the marking ruler to the platform surface, tightly leaning against the outer arc side of the elbow and tangent to the arc surface of the elbow by two vertical rulers, and drawing a No. 1 extension straight line L along the straight ruler by a fine talc pen1Marking out No. 2 extension straight line L of straight pipe section at the other end of the elbow pipe by the same method2. The marking ruler consists of a straight ruler, two vertical rulers and a transverse ruler, wherein the vertical rulers and the transverse ruler are welded or bonded on the straight ruler. The distance between the two vertical rulers is 200-400 mm, the length of the straight ruler is 300-1000 mm, and the length of the transverse ruler is 200-400 mm. The marking ruler is made of stainless steel, plastic or PVC.
The method for measuring the bending angle of the induction heating bent pipe optimizes the measuring steps, can accurately measure the bending angle of the bent pipe, improves the measuring working efficiency, and meets the use requirement of the field bent pipe installation process. Compared with the prior art, the invention has the advantages that: firstly, the method steps are reduced, and the measurement error is reduced; each step is mechanical measurement, so that human interference factors are reduced; randomly placing a ruler, and quickly calculating a bending angle by utilizing a triangle outer angle and a principle; fourthly, measuring the bent angle of the bent pipe by using an outer arc straight pipe section projection principle method, wherein the bent angle is more similar to the actual bent angle of the bent pipe; measuring tools are reduced, operation steps are few, operation is simple, and detection efficiency is high.
Drawings
FIG. 1 is a schematic diagram of a bend angle measurement method for an induction heating bend pipe according to the present invention;
FIG. 2 is a schematic view of the construction of the scribe ruler;
FIG. 3 is a schematic diagram of a prior art method of measuring the bend angle of an induction heated coil;
wherein: 1-bend, 2-square, 3-straight, 4-vertical, 5-horizontal, 6-dot, L1No. 1 extended straight line, L2No. 2 extension straight line, alpha-bending angle, a-short right-angle side length, b-long right-angle side length, and A-extension line intersection point.
Detailed Description
The present invention will be described in detail with reference to the following examples and drawings. The scope of protection of the invention is not limited to the embodiments, and any modification made by those skilled in the art within the scope defined by the claims also falls within the scope of protection of the invention.
Example 1
The invention discloses a method for measuring bending angle of an induction heating elbow, which uses two square rulers and a straight ruler to measure as shown in figure 1, and the measuring process comprises the following steps:
the method comprises the steps that a right-angle edge of two right-angle rulers 2 is attached to a platform, the other right-angle edge is close to the outer arc side of a bent pipe 1 and tangent to the bent pipe arc surface, and the distance between the two right-angle rulers is 250 mm;
paste the plane and the platform face of ruler, the side pastes with the vertical right angle limit of two parallels, draws out 1 extension straight line L along the ruler with the fine talc pen1Drawing out the extension straight line L of No. 2 straight pipe section at the other end of the elbow pipe by the same method2；
Thirdly, after the two extension lines are intersected through the intersection point A of the extension lines, the extension lines are continuously extended by 500mm, a triangle is framed by a right-angle ruler, and the side length a of the short right-angle side of the triangle is 132mm and the side length b of the long right-angle side of the triangle is 300mm are recorded by a detection ruler;
fourth, a bent pipe bending angle alpha is calculated by using a trigonometric function, and the calculation formula and the result of the bent pipe bending angle alpha are as follows:
α＝arctan(a/b)＝arctan(132/300)＝23.75°。
example 2
The method comprises the steps that a right-angle edge of two right-angle rulers 2 is attached to a platform, the other right-angle edge is close to the outer arc side of a bent pipe 1 and tangent to the bent pipe arc surface, and the interval distance between the two right-angle rulers is 200 mm;
the plane and the platform face of ruler are laminated, the side faces are laminated with two parallel vertical right-angle sides, drawing points 6 are marked at the vertex of the angle sides of the two right-angle rulers, two drawing points are connected in series with the ruler, and No. 1 extension straight line L is drawn1And No. 2 extended straight line L2
Thirdly, the triangle is extended by 300mm continuously through the intersection of the intersection point A of the two extension lines, the triangle is framed by a right-angle ruler, and the side length a of the short right-angle side of the triangle is 105mm and the side length b of the long right-angle side of the triangle is 280mm are recorded by a detection ruler;
fourth, a bent pipe bending angle alpha is calculated by using a trigonometric function, and the calculation formula and the result of the bent pipe bending angle alpha are as follows:
α＝arctan(a/b)＝arctan(105/280)＝20.56°。
example 3
The measurement is carried out by a marking ruler which is composed of a straight flat ruler 3, two vertical rulers 4 and a transverse ruler 5, as shown in figure 2, the marking ruler is made of stainless steel, and the vertical ruler and the transverse ruler are welded on the straight flat ruler. The distance between the two vertical rulers is 300mm, the height of the vertical ruler is 250mm, the length of the straight flat ruler 3 is 1000mm, and the length of the transverse ruler is 300 mm. The process of drawing the extension lines of the straight pipe sections at the two ends of the elbow pipe and measuring the bending angle by using the scribing ruler is as follows:
firstly, a straight flat ruler 3 and a transverse ruler 5 of a marking ruler are horizontally arranged on a platform and attached to the platform surface, two vertical rulers 4 are tightly attached to the outer arc side of a bent pipe 1 and tangent to the bent pipe arc surface, and a No. 1 extension straight line L is marked along the straight flat ruler 3 by a fine talc pen1Marking out No. 2 extension straight line L of straight pipe section at the other end of the elbow pipe by the same method2；
Continuously extending the triangle by 500mm through intersection of two extension line intersection points A, framing the triangle by using a right-angle ruler, and recording the side length a of a short right-angle side of the triangle as 145mm and the side length b of a long right-angle side of the triangle as 365mm by using a detection ruler;
thirdly, calculating a bent pipe bending angle alpha by using a trigonometric function, wherein the calculation formula and the result of the bent pipe bending angle alpha are as follows:
α＝arctan(a/b)＝arctan(145/365)＝21.67°。
Claims (5)
1. a method for measuring the bending angle of an induction heating bent pipe is characterized by comprising the following steps: placing the elbow (1) on a platform, and drawing extension lines L of straight pipe sections at two ends of the elbow by using two square rulers and a straight ruler or a marking ruler respectively1And L2Continuously extending the two extensions by 100-500 mm after the two extensions are intersected through an intersection point (A) of the extension lines, framing a triangle by using a right-angle ruler, recording the side length (a) of a short right-angle side and the side length (b) of a long right-angle side of the triangle by using a detection ruler, and calculating a bending angle alpha of the bent pipe by using a trigonometric function; the calculation formula of the bending angle alpha of the bent pipe is as follows:
α＝arctan(a/b)
wherein: alpha is the bending angle of the bent pipe, degree; a is the length of the short right-angle side, mm; and b is the length of the long right-angle side, which is mm.
2. The method of claim 1, wherein the bend angle of the induction heating coil is measured by: the process of drawing the extension lines of the straight pipe sections at the two ends of the elbow pipe by using the two square rulers is as follows:
the bending method includes the steps that a right-angle edge of each of two right-angle rulers is attached to a platform, the other right-angle edge of each right-angle ruler abuts against the outer arc side of a bent pipe (1) and is tangent to the arc surface of the bent pipe, and the distance between the two right-angle rulers is 200-300 mm;
paste the plane and the platform face of ruler, the side pastes with the vertical right angle limit of two parallels, draws out 1 extension straight line L along the ruler with the fine talc pen1Marking out No. 2 extension straight line L of straight pipe section at the other end of the elbow pipe by the same method2(ii) a Or marking a drawing point (6) at the top of the two right-angle rulers, connecting the two drawing points in series by using a ruler to draw a No. 1 extension straight line L1And No. 2 extended straight line L2。
3. The method of claim 1, wherein the bend angle of the induction heating coil is measured by: the process of drawing the extension lines of the straight pipe sections at the two ends of the elbow pipe by using the scribing ruler is as follows: the marking ruler is horizontally placed on the platform, a straight ruler (3) and a transverse ruler (5) of the marking ruler are attached to the platform surface, two vertical rulers (4) are close to the outer arc side of the elbow (1) and tangent to the arc surface of the elbow, and a No. 1 extension straight line L is marked along the straight ruler (3) by a fine talc pen1Marking out No. 2 extension straight line L of straight pipe section at the other end of the elbow pipe by the same method2。
4. The method of claim 3, wherein the bend angle of the induction heating coil is measured by: the marking ruler consists of a straight flat ruler (3), two vertical rulers (4) and a transverse ruler (5), wherein the vertical rulers and the transverse ruler are welded or bonded on the straight flat ruler; the distance between the two vertical rulers is 200-400 mm, the length of the straight flat ruler (3) is 300-1000 mm, and the length of the transverse ruler is 200-400 mm.
5. The method of claim 4, wherein the bend angle of the induction heating coil is measured by: the scribing ruler is made of stainless steel, plastic or PVC.
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| CN202110335992.3A CN113267112B (en) | 2021-03-29 | 2021-03-29 | Method for measuring bending angle of induction heating bent pipe |
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| CN202110335992.3A CN113267112B (en) | 2021-03-29 | 2021-03-29 | Method for measuring bending angle of induction heating bent pipe |
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