CN102589456A - Method for eliminating axis error during measurement of inner diameter and outer diameter of end of steel pipe - Google Patents
Method for eliminating axis error during measurement of inner diameter and outer diameter of end of steel pipe Download PDFInfo
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- CN102589456A CN102589456A CN2012100424739A CN201210042473A CN102589456A CN 102589456 A CN102589456 A CN 102589456A CN 2012100424739 A CN2012100424739 A CN 2012100424739A CN 201210042473 A CN201210042473 A CN 201210042473A CN 102589456 A CN102589456 A CN 102589456A
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Abstract
The invention provides a method for eliminating the axis error during measurement of inner diameter and outer diameter of the end of a steel pipe, and relates to a follow-up data processing method of a device for measuring the parameter of the end of the steel pipe. The measuring device drives a laser distance-measuring probe to rotate at the end of the pipe by a rotary table, and measures the distance between the probe and the inner wall and the outer wall of the steel pipe during rotating to further analyze the size of the inner diameter and the outer diameter of the steel pipe. The follow-up data processing method provided by the invention mainly can effectively the eliminate the axis error of the measuring device by mainly using a mode that translation and ellipse are mapped to a maximum inscribed circle, so that the measuring precision can be greatly improved, the machining requirement of an axis aligning structure can be reduced simultaneously, and the cost of the equipment can be reduced.
Description
Technical field
The present invention relates to steel pipe parameter measurement field, be specifically related to a kind of late time data disposal route of rotary process pipe end parameter measuring apparatus.
Background technology
Continuous progress along with pipeline site welding operating technique; The continuous application of semi-automatic, full automatic welding connection technology, make to the requirement of steel pipe caliber more and more stricter, particularly to pipe end; Not only its external diameter there is requirement, also very strict to the requirement of its pipe end ovality simultaneously.Its purpose just is to make it can accomplish welding smoothly when two pipes in the open air or when carrying out the pipe arrangement welding procedure in the ocean.Otherwise,, will cause the difficulty of two pipe butt welding if the tube end diameter of steel pipe and ovality exceed standard; Promptly enable reluctantly to welded together; Also can produce very big unrelieved stress, cause the mechanical property of commissure to descend, reduce pipeline security in use.Pipe-line is carried a large amount of inflammable and explosive media, bears dozens or even hundreds ofly to press in atmospheric, if the commissure mechanical property is bad, very easily leaks, explosion accident, can cause very big loss.
And because the restriction of production technology, the interior underproof steel pipe of external diameter still occupies certain ratio in the product.In order to filter out qualified steel pipe, simultaneously the large-diameter steel pipe quality of production is carried out monitoring tightly, internal diameter, external diameter and the ovality of large-diameter steel pipe detected be necessary.At present in the steel pipe industry tube rolling factory inside and outside measuring pipe end when footpath and thickness; The main manual measurers such as slide calliper rule and milscale that rely on detect; It is bigger influenced by production environment, measurer degree of accuracy and operating personnel's subjective factor, and measuring speed and data measured amount all can not reach higher level simultaneously.In order to reduce cost, improve detection speed, eliminate people's subjective factor influence, improve measuring accuracy, the external diameter measuring system improves the automaticity of steel pipe's production process in the pipe end of a kind of high-precision automatic of urgent need exploitation.
Mostly the pipe end parameter measuring apparatus that adopts at present is to utilize a rotation platform drive laser ranging probe to rotate at pipe end, while rotate the distance of Laser Measurement range finding probe distance steel pipe inside and outside wall.It is as shown in Figure 1 in the basic structure of the measurement mechanism of pipe end rotation to drive laser ranging probe based on rotation platform; In Fig. 1, the 1st, universal stage, the 2nd, turntable fixed pan; 3 and 4 is two laser ranging probes; 5 and 6 is the fixed supports that are used for fixing these two probe usefulness respectively, the 7th, and steel pipe to be measured, the 8th, universal stage rotating middle shaft line.3 vertical tube wall directions with 4 these two laser probes are placed; It is respectively A and B that the distance of probe distance steel pipe inside and outside wall records; The distance of known laser range finding probe distance steel pipe rotating middle shaft line (8) is C and D, and the external diameter that just can obtain steel pipe is C-A, and internal diameter is B+D.The data of external diameter in when universal stage rotates to different angles, measuring respectively just can obtain the inside/outside diameter size of steel pipe whole circumference, and then can analyze the ovality and the thickness of steel pipe.This method requires the center line of turntable rotation and the axis of steel pipe to be consistent; But because actual machine is processed, the error when assembling; This desirable situation be difficult to realize, so have than mistake can cause measuring the time, directly influences the raising of measuring accuracy.
Summary of the invention
Main source of error during the wheel measuring measurement device is axis that universal stage rotates and can not overlaps fully with the axis of steel pipe, and the interior external diameter that causes measuring is inaccurate.Article two, the axis does not overlap and mainly can be divided into two aspects, and one is that shaft core position has skew, and another one is that the degree of tilt of axis is different.
When shaft core position had skew, when on plane right-angle coordinate, drawing out two annulus measuring, at this moment the circle ring center that can find to measure can pass through the software fit method not on the initial point of coordinate system, calculate the center of annulus.Because the center basically identical of two annulus, appoint and get one of them and get final product.Calculate the distance of each point on the annulus then, be new internal diameter external diameter to this center.Utilize this way just can eliminate the error that the shaft core position skew brings.
When the axis of the axis of universal stage rotation and steel pipe in degree of tilt not simultaneously; Probe should be an ellipse around the plane of rotation and the tangent plane of steel pipe; Through analyzing this long axis of ellipse and minor axis; Can calculate the angle that tilts between two axis, then whole measuring measured the annulus that comes this angle is done projection mapping, just can eliminate the error that the degree of tilt difference is brought.
These two kinds of errors are simultaneous in the actual measurement, and the step of eliminating the internal diameter error with the present invention is:
At first, the corresponding angle of internal diameter external diameter is obtained two profile annulus of steel pipe inside and outside wall size according to external diameter data in the steel pipe that records and each.
Secondly, internal diameter profile is carried out ellipse fitting, obtain an oval T
1Keep then under the constant condition of this oval center and major axis short-axis direction the external diameter profile being carried out ellipse fitting, obtain another oval T
2Also can carry out ellipse fitting to the external diameter profile earlier, obtain oval T
2, keep T then
2Center and major and minor axis direction come match T
1
Then, then the position of each point on the inside and outside contour is recomputated.With certain some P on the internal diameter profile is example, with oval T
1Center M do ray to the direction of P, with oval T
1Intersection point is N, and the reposition P ' of P is on ray MP, and P ' with the computing method apart from MP ' that M is ordered is:
The oval T of MP '=MP*MN/
1Minor semi-axis length.
The reposition computing method of every bit are consistent therewith on the external diameter profile, with oval T
1Replace to T
2Get final product.
At last, the reposition of every bit and oval T on the internal diameter profile
1The distance of center M is exactly new internal diameter, and the distance of the reposition of every bit and center M is exactly new external diameter data on the external diameter profile.
Description of drawings
Fig. 1 is pipe end parameter measurement system measuring principle figure.
Fig. 2 is an axle center error cancelling method exemplary plot.
Embodiment
For the pipe end parameter measuring apparatus that the present invention is directed to; Utilizing physical construction to make as much as possible under the condition that two axis are consistent; Remaining measuring error can reduce through method provided by the invention; Thereby improve measuring accuracy greatly, reduced processing request simultaneously, reduced equipment cost the axes alignment structure.
Main source of error during the wheel measuring measurement device is axis that universal stage rotates and can not overlaps fully with the axis of steel pipe, and the interior external diameter that causes measuring is inaccurate.Article two, the axis does not overlap and mainly can be divided into two aspects, and one is that shaft core position has skew, and another one is that the degree of tilt of axis is different.
When shaft core position had skew, when on plane right-angle coordinate, drawing out two annulus measuring, at this moment the circle ring center that can find to measure can pass through the software fit method not on the initial point of coordinate system, calculate the center of annulus.Because the center basically identical of two annulus, appoint and get one of them and get final product.Calculate the distance of each point on the annulus then, be new internal diameter external diameter to this center.Utilize this way just can eliminate the error that the shaft core position skew brings.
When the axis of the axis of universal stage rotation and steel pipe in degree of tilt not simultaneously; Probe should be an ellipse around the plane of rotation and the tangent plane of steel pipe; Through analyzing this long axis of ellipse and minor axis; Can calculate the angle that tilts between two axis, then whole measuring measured the annulus that comes this angle is done projection mapping, just can eliminate the error that the degree of tilt difference is brought.
These two kinds of errors are simultaneous in the actual measurement, and as shown in Figure 2, the step of eliminating the internal diameter error with the present invention is:
At first, the corresponding angle of internal diameter external diameter is obtained two profile annulus of steel pipe inside and outside wall size according to external diameter data in the steel pipe that records and each.On plane right-angle coordinate, among the XOY these two profile annulus are drawn.
Secondly, internal diameter profile is carried out ellipse fitting, obtain an oval T
1Keep then under the constant condition of this oval center and major axis short-axis direction the external diameter profile being carried out ellipse fitting, obtain another oval T
2Also can carry out ellipse fitting to the external diameter profile earlier, obtain oval T
2, keep T then
2Center and major and minor axis direction come match T
1The purpose of doing like this is to obtain two centers to overlap the ellipse that the major and minor axis direction is consistent.
Then, then the position of each point on the inside and outside contour is recomputated.With certain some P on the internal diameter profile is example, with oval T
1Center M do ray to the direction of P, with oval T
1Intersection point is N, and the reposition P ' of P is on ray MP, and P ' with the computing method apart from MP ' that M is ordered is:
The oval T of MP '=MP*MN/
1Minor semi-axis length.
This computing method in fact the time with oval T
1On point to T
1Central point M is the center, with T
1Minor semi-axis length is the round T of radius
3Do projection mapping.The reposition computing method of every bit are consistent therewith on the external diameter profile, with oval T
1Replace to T
2Get final product.
At last, the reposition of every bit and oval T on the internal diameter profile
1The distance of center M is exactly new internal diameter, and the distance of the reposition of every bit and center M is exactly new external diameter data on the external diameter profile.Oval T
1Center M is the position, axis of steel pipe, and OM is exactly the deviation of steel pipe central shaft and turntable central shaft, and the mode that can move through machinery moves to the M point with the position of turntable central shaft, and error will be dwindled much when measured next time.
Error cancelling method provided by the invention is applicable to the situation of universal stage axis and steel pipe axis basically identical, can effectively eliminate two axis to the inaccurate error of bringing of the heart, improves measuring accuracy.If differ too big, this method is just not too effective.
Claims (1)
1. axle center error cancelling method in the outside diameter measuring in the pipe end, this method may further comprise the steps:
At first, the corresponding angle of internal diameter external diameter is obtained two profile annulus of steel pipe inside and outside wall size according to external diameter data in the steel pipe that records and each;
Secondly, internal diameter profile is carried out ellipse fitting, obtain an oval T
1Keep then under the constant condition of this oval center and major axis short-axis direction the external diameter profile being carried out ellipse fitting, obtain another oval T
2Also can carry out ellipse fitting to the external diameter profile earlier, obtain oval T
2, keep T then
2Center and major and minor axis direction come match T
1
Then, then the position of each point on the inside and outside contour is recomputated; With certain some P on the internal diameter profile is example, with oval T
1Center M do ray to the direction of P, with oval T
1Intersection point is N, and the reposition P ' of P is on ray MP, and P ' with the computing method apart from MP ' that M is ordered is:
The oval T of MP '=MP*MN/
1Minor semi-axis length;
The reposition computing method of every bit are consistent therewith on the external diameter profile, with oval T
1Replace to T
2Get final product;
At last, the reposition of every bit and oval T on the internal diameter profile
1The distance of center M is exactly new internal diameter size, and the distance of the reposition of every bit and center M is exactly new external diameter size on the external diameter profile.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100424739A CN102589456A (en) | 2012-02-24 | 2012-02-24 | Method for eliminating axis error during measurement of inner diameter and outer diameter of end of steel pipe |
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| CN2012100424739A CN102589456A (en) | 2012-02-24 | 2012-02-24 | Method for eliminating axis error during measurement of inner diameter and outer diameter of end of steel pipe |
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| CN102589456A true CN102589456A (en) | 2012-07-18 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104729416A (en) * | 2013-12-19 | 2015-06-24 | 南开大学 | Method capable of automatically adjusting rotation radius and measuring inner diameter and outer diameter of pipe end of steel pipe |
| CN104913741A (en) * | 2015-06-05 | 2015-09-16 | 天津大学 | Ray-cluster-based method for measuring aperture and tilt angle of workpiece at free station |
| WO2015157210A1 (en) * | 2014-04-10 | 2015-10-15 | Tri Tool Inc. | System and method for automated pipe measurement and alignment |
| CN111678481A (en) * | 2020-06-22 | 2020-09-18 | 广东电网有限责任公司东莞供电局 | Pipeline thickness measuring device |
| CN111922485A (en) * | 2020-07-31 | 2020-11-13 | 北京圣龙博睿科技有限公司 | Method for determining origin of steam generating pipe with end face being inclined plane and automatically welding origin |
| CN112781480A (en) * | 2021-01-18 | 2021-05-11 | 广州海狮软件科技有限公司 | Pipe diameter and thickness measuring instrument and measuring method thereof |
| CN114252041A (en) * | 2020-09-21 | 2022-03-29 | 宝山钢铁股份有限公司 | Non-contact type on-line measuring method for outer diameter of steel pipe end |
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| US6289600B1 (en) * | 1999-11-02 | 2001-09-18 | United States Pipe & Foundry Company | Non-contact measuring device |
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- 2012-02-24 CN CN2012100424739A patent/CN102589456A/en active Pending
Patent Citations (4)
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| JPH06229725A (en) * | 1993-01-29 | 1994-08-19 | Nippon Steel Corp | Outer diameter measuring method for tubular object |
| US6289600B1 (en) * | 1999-11-02 | 2001-09-18 | United States Pipe & Foundry Company | Non-contact measuring device |
| CN1734233A (en) * | 2005-09-13 | 2006-02-15 | 清华大学 | System and method for measuring section shape and size of heavy caliber steel pipe |
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Non-Patent Citations (1)
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104729416A (en) * | 2013-12-19 | 2015-06-24 | 南开大学 | Method capable of automatically adjusting rotation radius and measuring inner diameter and outer diameter of pipe end of steel pipe |
| WO2015157210A1 (en) * | 2014-04-10 | 2015-10-15 | Tri Tool Inc. | System and method for automated pipe measurement and alignment |
| US9372076B2 (en) | 2014-04-10 | 2016-06-21 | Tri Tool Inc. | System and method for automated pipe measurement and alignment |
| CN104913741A (en) * | 2015-06-05 | 2015-09-16 | 天津大学 | Ray-cluster-based method for measuring aperture and tilt angle of workpiece at free station |
| CN111678481A (en) * | 2020-06-22 | 2020-09-18 | 广东电网有限责任公司东莞供电局 | Pipeline thickness measuring device |
| CN111678481B (en) * | 2020-06-22 | 2022-02-08 | 广东电网有限责任公司东莞供电局 | Pipeline thickness measuring device |
| CN111922485A (en) * | 2020-07-31 | 2020-11-13 | 北京圣龙博睿科技有限公司 | Method for determining origin of steam generating pipe with end face being inclined plane and automatically welding origin |
| CN111922485B (en) * | 2020-07-31 | 2022-04-01 | 北京圣龙博睿科技有限公司 | Method for determining origin of steam generating pipe with end face being inclined plane and automatically welding origin |
| CN114252041A (en) * | 2020-09-21 | 2022-03-29 | 宝山钢铁股份有限公司 | Non-contact type on-line measuring method for outer diameter of steel pipe end |
| CN114252041B (en) * | 2020-09-21 | 2024-02-13 | 宝山钢铁股份有限公司 | Non-contact online measuring method for outer diameter of pipe end of steel pipe |
| CN112781480A (en) * | 2021-01-18 | 2021-05-11 | 广州海狮软件科技有限公司 | Pipe diameter and thickness measuring instrument and measuring method thereof |
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Application publication date: 20120718 |