CN114662345A - Method for manufacturing large-diameter shrimp shell bent pipe - Google Patents
Method for manufacturing large-diameter shrimp shell bent pipe Download PDFInfo
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- CN114662345A CN114662345A CN202210561021.5A CN202210561021A CN114662345A CN 114662345 A CN114662345 A CN 114662345A CN 202210561021 A CN202210561021 A CN 202210561021A CN 114662345 A CN114662345 A CN 114662345A
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Abstract
The invention relates to a method for manufacturing a large-diameter shrimp shell elbow, which comprises the steps of firstly drawing a side projection view of the elbow according to the actual size in drawing software, and then dividing segments; measuring in software three length positioning data representative of the leading segment and the trailing segment, and three length positioning data representative of the middle segment; then measuring on a straight pipe of the material, and setting three positioning points in the straight pipe by using three positioning data; adjusting the horizontal laser to be parallel to the axis of the straight pipe by adopting a 360-degree infrared level gauge, adjusting the vertical laser to pass through three positioning points simultaneously, and drawing a cutting positioning line of a corresponding section according to a projection line of the vertical laser; the method has the advantages that the acquired data are less, the positioning of the cutting line is convenient and quick, the cutting seam is smooth, and the fineness is high.
Description
Technical Field
The invention relates to the technical field of large-scale pipeline manufacturing, in particular to a method for manufacturing a large-diameter shrimp shell elbow.
Background
The engineering construction of metallurgy, coal industry and municipal heating power and the like often involves the installation of a large number of large-diameter pipelines and pipe fittings. In order to meet the requirements of engineering progress and construction process in the process of pipeline installation, a large number of elbows are required to be manufactured, and the manufacturing amount of large-intermediate-diameter elbows is large.
The lofting manufacturing process of the bent pipe in the prior art is as follows: firstly, drawing the side projection of the bent pipe in software, and designing sections on the side projection of the bent pipe. And then, unfolding each segment in software, drawing a pipeline plane graph, taking a central line perpendicular to the pipeline axis in the pipeline plane graph, measuring the distance between a plurality of positioning points and the central line on the section of the segment based on the central line, and forming a point-distance positioning system by each point taking and measurement data. Then, according to the positioning system, a vertical positioning circle is determined on the material pipeline, and a plurality of positioning points are measured based on the positioning circle. And then connecting the positioning points to obtain the pipeline section cutting line. Cutting two sides of the positioning circle to obtain a segment. Generally speaking, the more positioning points, the higher the precision of the obtained cutting line, so that when constructing large-diameter pipelines in the prior art, dozens of or even twenty several points need to be determined, and then a relatively smooth pipeline cutting line can be formed.
The existing lofting method has a plurality of positioning points, and a large amount of measurement work is needed in software or actual operation. The larger the construction target pipe diameter is, the more the segment fraction is, the multiplied increase of the measurement and positioning workload consumes a great deal of time and labor. Therefore, how to perform the elbow lofting rapidly and efficiently is a technical problem that needs to be further discussed by those skilled in the art.
Disclosure of Invention
The invention aims to simplify the measurement and positioning operation of the lofting of the elbow pipe, thereby providing a method for manufacturing the large-diameter shrimp shell elbow pipe.
The invention achieves the aim, and adopts the technical scheme that:
a method for manufacturing a large-diameter shrimp shell elbow pipe comprises the following specific manufacturing steps:
firstly, drawing a side projection view of the bent pipe in drawing software according to the actual size;
secondly, dividing the side projection of the bent pipe into n sections on a drawing, wherein the sum of the 1/n section and the n/n section is equal to any one middle section; the outer end faces of the 1/n section and the n/n section are perpendicular to the axis of the elbow;
thirdly, drawing a closed wire frame graph of each segment, wherein the closed wire frame graph comprises a seam line, a segment inner arc contour line and a segment outer arc contour line of each segment; selecting three positioning points of the first positioning point, the second positioning point and the third positioning point on the circumference of the bent pipe, and measuring the pipe wall length of each section on the three positioning points to obtain positioning auxiliary lines M1, M2 and M3 of the 1/N section and the N/N section and positioning auxiliary lines N1, N2 and N3 of the middle section;
fourthly, fixing the straight pipe for manufacturing the bent pipe, and determining a first positioning point, a second positioning point and a third positioning point on the end surface of the straight pipe according to a drawing; respectively measuring the lengths of M1, M2 and M3 in the straight pipe based on the three positioning points of the first, the second and the third, and determining three points of the first, the second and the third on the inner wall of the straight pipe;
fifthly, placing a 360-degree infrared level gauge in the straight pipe, adjusting the horizontal laser of the level gauge to be parallel to the axis of the straight pipe, and adjusting the vertical laser of the level gauge to be inclined and simultaneously pass through three points of the first point, the second point and the third point; drawing a cutting positioning line of the 1/n section on the inner wall of the straight pipe according to a vertical laser projection line;
sixthly, respectively measuring the lengths of N3, N2 and N1 in the straight pipe based on the first, second and third positioning points; keeping the horizontal laser of the 360-degree infrared level instrument parallel to the axis of the straight pipe, continuously moving the horizontal laser to the straight pipe, and adjusting the vertical laser of the 360-degree infrared level instrument to pass through three positioning points of (i), (ii) and (iii); drawing a cutting positioning line of the 2/n section on the inner wall of the straight pipe according to a vertical laser projection line;
seventhly, respectively measuring the lengths of N1, N2 and N3 in the straight pipe based on three positioning points of the first, second and third to obtain three positioning points of the first ˆ, the second ˆ and the third ˆ; keeping the horizontal laser of the 360-degree infrared level instrument parallel to the axis of the straight pipe, continuously moving the horizontal laser to the straight pipe, and adjusting the vertical laser of the 360-degree infrared level instrument to pass through three positioning points of firstly ˆ, secondly ˆ and thirdly ˆ; drawing a cutting positioning line of a 3/n section on the inner wall of the straight pipe according to a vertical laser projection line;
eighthly, repeating the operation processes of the sixth step and the seventh step, and drawing the cutting positioning lines of all the middle sections backwards in sequence;
ninthly, determining an end face positioning point of the nth/nth segment in the straight pipe; the 360-degree infrared level meter continues to translate to the depth of the straight pipe, the vertical laser is adjusted to be perpendicular to the axis of the straight pipe, the vertical laser projection line passes through the end face positioning point of the nth/n section, and the cutting positioning line of the nth/n section is drawn;
and step ten, cutting the straight pipe according to each cutting positioning line, and then welding each segment into a bent pipe in sequence.
Compared with the prior art, the invention adopting the technical scheme has the beneficial effects that:
in the invention, each divided segment has more same data, the data quantity to be measured is less, and the same data can be used for multiple times; the invention combines the 360-degree infrared level meter, and determines the complete section cutting positioning line by using only three positioning points, compared with the prior art that the cutting positioning line is connected after positioning dozens of or twenty more positioning points, the cutting positioning line has higher fineness and smoother cut.
Preferably, the further technical scheme of the invention is as follows:
and n is an odd number. The bent pipe is divided into odd sections, so that a pipe joint rather than a welding seam is positioned at the central line of the bent pipe, the strength of the pipeline is high, and the resistance is small.
The 360-degree infrared level meter is arranged at the inner bottom of the straight pipe, and the ground datum point of the 360-degree infrared level meter is a length positioning point. The level gauge is well installed at the bottom of the pipeline and is easy to position.
The first positioning point is a 270-degree point on the bent pipe and the straight pipe; ② 0 degree or 180 degree point; and ③ 90 degrees. The positioning points are easily measured on the drawing by the scheme, and the positioning points are actually easily positioned on the straight pipe.
Drawings
FIG. 1 is a projection view of a target bent tube depicted in the drawing software according to the present invention;
FIG. 2 is a diagram of an embodiment of the invention for segmentation planning in a side projection view;
FIG. 3 is a schematic view of the present invention performing a first positioning operation on a straight pipe;
FIG. 4 is a schematic view of the positioning of the cutting lines for each segment within a straight pipe according to the present invention;
FIG. 5 is a schematic view of the present invention cutting a first segment according to a cutting orientation line;
FIG. 6 is a schematic view of the cut line positioning of the last segment of the present invention;
FIG. 7 is a sectional layout view of an embodiment of the present invention dividing a 90 degree elbow into four sections;
FIG. 8 is a sectional layout of an embodiment of the present invention dividing a 70 degree elbow into three sections.
In the figure: 1. segment 1/n; 2. an intermediate section; 3. an nth/nth segment; 4. a straight pipe; 5. a 360 degree infrared level; 6. vertical laser; 7. horizontal laser; 8. and cutting a positioning line.
Detailed Description
The invention will be further illustrated by the following examples, which are intended only for a better understanding of the present invention and therefore do not limit the scope of the invention.
Referring to fig. 1 to 6, the method for manufacturing the large-diameter shrimp shell elbow provided by the invention specifically comprises the following steps:
firstly, drawing a side projection view of the bent pipe in drawing software according to the actual size. Referring to fig. 1, a first embodiment of the present invention provides a bent tube having a 90 ° bend radius.
Secondly, dividing the side projection of the elbow into n sections on the drawing, referring to fig. 2, wherein the sum of the 1/n section 1 and the n/n section 3 is equal to any one of the middle sections 2; the outer end faces of the 1/n segment 1 and the n/n segment 3 are perpendicular to the elbow axis. In this embodiment, the elbow is divided into three sections, and the first section and the third section are each half of the second section.
And thirdly, drawing a closed wire frame graph of each segment, wherein the closed wire frame graph comprises a seam line, a segment inner arc contour line and a segment outer arc contour line of each segment. Selecting three positioning points of the first, the second and the third on the circumference of the bent pipe, measuring the pipe wall length of each segment on the three positioning points, and obtaining a group of positioning auxiliary lines of the 1/n segment 1 and the n/n segment 3: m1, M2, and M3, and a set of positioning assistance lines of the middle section 2: n1, N2 and N3. In the embodiment of the invention, three positioning points are selected. Specifically, three positions of 0 degree, 90 degrees and 270 degrees are respectively taken on the circumference of the end face of the elbow. Of course, the three points are not limited to the above positions, and other points on the circumference may be used. According to the principle that three points determine a plane, the three positioning points are used for positioning the cutting surface of the pipeline. The angle values obtained by the three positioning points are convenient for the operator to observe when the operator is right standing. Specifically, the bottom (directly below the center point of the pipeline) of the straight pipe 4 on the ground is a 270-degree point, the right side of the center of the straight pipe 4 is a 0-degree point, the right side of the center of the straight pipe 4 is a 180-degree point, and the right side of the center of the straight pipe is a 90-degree point. In the drawing, the outer arc contour line of the elbow is set to be on line corresponding to a 90-degree point on the straight pipe 4, and the inner arc contour line of the elbow is set to be on line corresponding to a 270-degree point on the straight pipe 4. The selection mode of the positioning points is easy to measure on a drawing, and the positioning is easy to perform on a straight pipe during actual operation.
Fourthly, referring to fig. 3, fixing the straight pipe 4 for manufacturing the bent pipe, determining three positioning points of (i), (ii) and (iii) on the end surface of the straight pipe 4 according to a drawing, then respectively measuring the lengths of M1, M2 and M3 in the straight pipe 4 based on the three points, and determining (i), (ii) and (iii) on the straight pipe 4.
Fifthly, a 360-degree infrared level 5 is placed in the straight pipe 4, the horizontal laser 7 of the level is adjusted to be parallel to the axis of the straight pipe 4, and the vertical laser 6 of the level is adjusted to be inclined and simultaneously passes through three points of the first point, the second point and the third point. And finally, drawing a 1/n section cutting positioning line 8 on the inner wall of the straight pipe 4 according to the projection line of the vertical laser 6.
Sixthly, referring to fig. 4, 5 and 6, respectively measuring the lengths of N3, N2 and N1 in the straight pipe 4 based on the first, second and third positioning points; keeping the horizontal laser 7 of the 360-degree infrared level 5 parallel to the axis of the straight pipe 4, continuously moving the horizontal laser 7 into the straight pipe 4, and adjusting the vertical laser 6 of the 360-degree infrared level 5 to pass through three positioning points of (i), (ii) and (iii) simultaneously; and drawing a cutting positioning line 8 of the 2/n section on the inner wall of the straight pipe 4 according to a vertical laser 6 projection line.
Seventhly, based on three positioning points of't, no ' and no ', respectively measuring the lengths of N1, N2 and N3 in the straight pipe 4 to obtain three positioning points of ' ˆ ', no ' ˆ and no ' ˆ; keeping the horizontal laser 7 of the 360-degree infrared level 5 parallel to the axis of the straight pipe 4, continuously moving the horizontal laser 7 into the straight pipe 4, and adjusting the vertical laser 6 of the 360-degree infrared level 5 to pass through three positioning points of firstly ˆ, secondly ˆ and thirdly ˆ simultaneously; and drawing a cutting positioning line 8 of the 3/n section on the inner wall of the straight pipe 4 according to a vertical laser 6 projection line.
And eighthly, repeating the operation processes of the sixth step and the seventh step, and finishing the drawing of the cutting positioning lines 8 of all the middle sections 2 sequentially backwards.
And ninthly, continuously translating the 360-degree infrared level meter 5 to the depth of the straight pipe 4, and adjusting the vertical laser 6 to 90 degrees to enable the vertical laser to be vertical to the axis of the straight pipe. And determining the end surface positioning point of the n/n section 3 in the straight pipe 4, and drawing a cutting positioning line 8 of the n/n section 3 by passing a vertical laser 6 through the positioning point. The last segment can be positioned by only using M1 or M3 measurement, the pipeline is divided into an odd number of segments in the embodiment shown in FIG. 6, the inner arc contour line of the nth segment 3 is positioned at the bottom of the straight pipe 4, the outer arc contour line is positioned at the top of the straight pipe 4, and the M1 length is measured into the straight pipe based on (i); if the pipe includes an even number of segments, the M3 length location should be measured into a straight pipe based on (r). It is of course also possible to operate strictly as in the three-point method described above.
Step ten, referring to fig. 5 and 6, the straight pipe 4 is cut according to each cutting positioning line 8, and then all the sections are welded into the bent pipe in sequence.
Regarding the use of the 360-degree infrared level meter 5, with reference to fig. 3 and 4, when cutting is performed on the straight pipe 4, the included angles between each cutting positioning line 8 and the vertical line are all equal, so that the inclination angle of the vertical laser 6 of the 360-degree infrared level meter 5 only needs to be adjusted once in an ideal state, and the vertical laser can be directly placed on the positioning point through linear movement and horizontal overturning.
Regarding the distance positioning, the 1 st/n segment 1 and the n th/n segment 3 have the same size, and their sizes can be shared in numerical operation, and only data of one of them need to be measured. All the intermediate segments 2 are the same size and a set of data is measured.
Fig. 7 shows an example layout of a 90 ° bend divided into four segments. Fig. 8 shows a loft view of a 70 deg. bend divided into three segment embodiments. The bent pipe is segmented by combining the bending radius and the diameter of the bent pipe when segmented, two segments are reduced, and more can reach nine segments or more than ten segments. The method for manufacturing the bent pipe provided by the invention only needs to record two groups of data, namely the first section and the middle section after segmentation.
The beneficial effects of the invention are:
1) the data repetition rate of each section is high, and the same group of values can be used for multiple times, so that the data quantity required to be acquired is small;
2) the invention relates to a cutting positioning line drawing method, which involves drawing a cutting positioning line through a 360-degree infrared level meter and is used for determining that the number of positioning points of one cutting positioning line is small. The number of the invention is only three or four. The operation is convenient, and the measuring time is saved.
3) The invention adopts a 360-degree infrared level meter to provide a complete cutting positioning line mark, and the drawn cutting line is a complete circle or ellipse, so that the cutting line has high fineness, smooth cutting seam and few edges.
The invention has the advantages of convenient operation, rapidness, high efficiency, safety and reliability, and can save a large amount of cost and more importantly save a large amount of construction time.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the present invention, which is defined in the appended claims.
Claims (4)
1. The manufacturing method of the large-diameter shrimp shell elbow comprises the following specific manufacturing steps:
firstly, drawing a side projection view of the bent pipe in drawing software according to the actual size;
step two, divide into n sections with return bend side projection on the drawing, its characterized in that: the sum of the 1/nth segment and the nth/nth segment is equal to any one of the intermediate segments; the outer end faces of the 1/n section and the n/n section are perpendicular to the axis of the elbow;
thirdly, drawing a closed wire frame graph of each segment, wherein the closed wire frame graph comprises a seam line, a segment inner arc contour line and a segment outer arc contour line of each segment; selecting three positioning points of the first positioning point, the second positioning point and the third positioning point on the circumference of the bent pipe, and measuring the pipe wall length of each section on the three positioning points to obtain positioning auxiliary lines M1, M2 and M3 of the 1/N section and the N/N section and positioning auxiliary lines N1, N2 and N3 of the middle section;
fourthly, fixing the straight pipe for manufacturing the bent pipe, and determining a first positioning point, a second positioning point and a third positioning point on the end surface of the straight pipe according to a drawing; respectively measuring the lengths of M1, M2 and M3 in the straight pipe based on the three positioning points of the first, the second and the third, and determining three points of the first, the second and the third on the inner wall of the straight pipe;
fifthly, placing a 360-degree infrared level gauge in the straight pipe, adjusting the horizontal laser of the level gauge to be parallel to the axis of the straight pipe, and adjusting the vertical laser of the level gauge to be inclined and simultaneously pass through three points of the first point, the second point and the third point; drawing a cutting positioning line of the 1/n section on the inner wall of the straight pipe according to a vertical laser projection line;
sixthly, respectively measuring the lengths of N3, N2 and N1 in the straight pipe based on the first, second and third positioning points; keeping the horizontal laser of the 360-degree infrared level instrument parallel to the axis of the straight pipe, continuously moving the horizontal laser to the straight pipe, and adjusting the vertical laser of the 360-degree infrared level instrument to pass through three positioning points of (i), (ii) and (iii); drawing a cutting positioning line of the 2/n section on the inner wall of the straight pipe according to a vertical laser projection line;
seventhly, respectively measuring the lengths of N1, N2 and N3 in the straight pipe based on three positioning points of the first, second and third to obtain three positioning points of the first ˆ, the second ˆ and the third ˆ; keeping the horizontal laser of the 360-degree infrared level instrument parallel to the axis of the straight pipe, continuously moving the horizontal laser to the straight pipe, and adjusting the vertical laser of the 360-degree infrared level instrument to pass through three positioning points of firstly ˆ, secondly ˆ and thirdly ˆ; drawing a cutting positioning line of a 3/n section on the inner wall of the straight pipe according to a vertical laser projection line;
eighthly, repeating the operation processes of the sixth step and the seventh step, and drawing the cutting positioning lines of all the middle sections backwards in sequence;
ninthly, determining an end face positioning point of the nth/nth segment in the straight pipe; the 360-degree infrared level meter continues to translate to the depth of the straight pipe, the vertical laser is adjusted to be perpendicular to the axis of the straight pipe, the vertical laser projection line passes through the end face positioning point of the nth/n section, and the cutting positioning line of the nth/n section is drawn;
and step ten, cutting the straight pipe according to each cutting positioning line, and then welding each segment into a bent pipe in sequence.
2. A method for manufacturing a large-diameter shrimp shell elbow as claimed in claim 1 wherein: and n is an odd number.
3. A method for making a large diameter shrimp shell elbow as claimed in claim 1 wherein: the 360-degree infrared level meter is arranged at the inner bottom of the straight pipe, and the ground datum point of the 360-degree infrared level meter is a length positioning point.
4. A method for making a large diameter shrimp shell elbow as claimed in claim 1 wherein: the first positioning point is a 270-degree point on the bent pipe and the straight pipe; ② 0 degree or 180 degree point; and ③ 90 degrees.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210561021.5A CN114662345B (en) | 2022-05-23 | 2022-05-23 | Method for manufacturing large-diameter shrimp shell bent pipe |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210561021.5A CN114662345B (en) | 2022-05-23 | 2022-05-23 | Method for manufacturing large-diameter shrimp shell bent pipe |
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| CN114662345A true CN114662345A (en) | 2022-06-24 |
| CN114662345B CN114662345B (en) | 2022-08-05 |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005047745A2 (en) * | 2003-10-15 | 2005-05-26 | United States Pipe And Foundry Company, Llc | Energized restraining gasket for mechanical joints of pipes |
| CN1812868A (en) * | 2003-04-28 | 2006-08-02 | 斯蒂芬·詹姆斯·克兰普顿 | CMM arm with exoskeleton |
| CN101094613A (en) * | 2003-11-10 | 2007-12-26 | 血管技术国际股份公司 | Intravascular devices and fibrosis-inducing agents |
| CN101856682A (en) * | 2010-05-25 | 2010-10-13 | 武汉市天虹仪表有限责任公司 | Pipe bender |
| CN102231357A (en) * | 2011-05-12 | 2011-11-02 | 陕西建工集团设备安装工程有限公司 | Construction method for controlling cleanliness of electronic-grade multicrystal-silicon process pipe |
| CN104896988A (en) * | 2015-06-11 | 2015-09-09 | 沈阳汇博热能设备有限公司 | Universal supporting device for bent pipe part of U-shaped pipe bundle |
| CN106840116A (en) * | 2016-07-29 | 2017-06-13 | 上海市建筑装饰工程集团有限公司 | Three-dimensional lofting method |
-
2022
- 2022-05-23 CN CN202210561021.5A patent/CN114662345B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1812868A (en) * | 2003-04-28 | 2006-08-02 | 斯蒂芬·詹姆斯·克兰普顿 | CMM arm with exoskeleton |
| WO2005047745A2 (en) * | 2003-10-15 | 2005-05-26 | United States Pipe And Foundry Company, Llc | Energized restraining gasket for mechanical joints of pipes |
| CN101094613A (en) * | 2003-11-10 | 2007-12-26 | 血管技术国际股份公司 | Intravascular devices and fibrosis-inducing agents |
| CN101856682A (en) * | 2010-05-25 | 2010-10-13 | 武汉市天虹仪表有限责任公司 | Pipe bender |
| CN102231357A (en) * | 2011-05-12 | 2011-11-02 | 陕西建工集团设备安装工程有限公司 | Construction method for controlling cleanliness of electronic-grade multicrystal-silicon process pipe |
| CN104896988A (en) * | 2015-06-11 | 2015-09-09 | 沈阳汇博热能设备有限公司 | Universal supporting device for bent pipe part of U-shaped pipe bundle |
| CN106840116A (en) * | 2016-07-29 | 2017-06-13 | 上海市建筑装饰工程集团有限公司 | Three-dimensional lofting method |
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