CN114459321B

CN114459321B - Spatial dislocation isodiametric pipeline connection method based on deflection angle and offset measurement

Info

Publication number: CN114459321B
Application number: CN202111532830.5A
Authority: CN
Inventors: 常彦秋; 赵志立; 邱庆凡; 刘增彬; 孙国庆
Original assignee: Fujisi Qingdao Composite Pipe Co ltd
Current assignee: Fujisi Qingdao Composite Pipe Co ltd
Priority date: 2021-12-15
Filing date: 2021-12-15
Publication date: 2024-04-12
Anticipated expiration: 2041-12-15
Also published as: CN114459321A

Abstract

The invention discloses a method for connecting spatially-staggered equal-diameter pipelines based on a measurement deflection angle and an offset, which comprises the following steps: determining intersecting lines of the respective end parts of the space dislocation pipelines P1 and P2; determining transition pipe intersecting lines of which two ends of the middle transition pipe P3 are matched with the intersecting lines of the space dislocation pipelines P1 and P2 respectively; cutting the end parts of the space dislocation pipelines P1 and P2 and the two end parts of the middle transition pipe P3; grinding the cut edges of the cut intermediate transition pipe P3, the space dislocation pipeline P1 and the space dislocation pipeline P2; and matching and fixedly connecting the grinded intermediate transition pipe P3, the space dislocation pipeline P1 and the space dislocation pipeline P2. The invention carries out the steps of angle measurement, marking and marking by a digital display universal angle ruler, determining an unfolding diagram by a mobile phone sheet metal unfolding app and the like, thereby realizing the corresponding cutting and intersecting connection of the space dislocation pipelines P1 and P2 and the middle transition pipe P3; the whole method is simple and easy to operate, and complex equation operation is not needed.

Description

Spatial dislocation isodiametric pipeline connection method based on deflection angle and offset measurement

Technical Field

The invention belongs to the technical field of pipeline connection, and particularly relates to a method for connecting a space dislocation isodiametric pipeline based on a measurement deflection angle and an offset.

Background

With the increasing number of applications of pipelines in ship and ocean engineering projects, long-distance transportation of oil and gas fields and chemical engineering projects, the problem of pipeline space dislocation in the field installation and maintenance process is also increasing, so that a plurality of hidden troubles are brought to the quality of installation and maintenance.

At present, the connection technology of the space dislocation equal-diameter pipeline mainly comprises a field measurement method based on non-contact measurement equipment-total station and a pipe orifice center positioning method.

Firstly, acquiring real three-dimensional coordinates of space points of an in-situ pipeline and constructing a cylindrical parameter model based on a field measurement method of a non-contact measurement device-total station; then substituting a cylindrical parameter model for cylindrical fitting based on the three-dimensional coordinates of the points on the pipe wall, and giving an existing pipeline centerline equation by using an iterative algorithm so as to further determine the angle and the pose of the elbow; then, based on the coordinates of measuring points on the end face of the pipeline, substituting a space plane equation to perform plane fitting, obtaining a pipe orifice equation with two ends connected by using an iterative algorithm, performing unified coordinate system transformation on the two planes, determining the size of the excessive pipe, drawing a two-dimensional expansion diagram of the excircle of the pipe orifice end face, and providing a template for cutting the excessive pipe; and (5) scribing and cutting the printed excessive pipe template on the steel pipe. The method has more requirements on measuring instruments and operation space, and meanwhile, each equation needs to be solved, so that the calculation is very complex.

Firstly, drawing a circle on the outer wall of a first pipeline at the central point of a pipeline opening of a second pipeline by using a flexible wire, cutting off a port of the first pipeline along the drawn circle, and enabling the pipeline opening of the first pipeline to form a bevel circle; drawing a circle on the outer wall of the second pipeline by using a flexible wire at the center point of the bevel circle of the pipeline opening of the first pipeline, cutting off the port of the second pipeline along the drawn circle, and forming a bevel circle at the pipeline opening of the second pipeline; the groove circles of two pipeline openings are equidistant, a vertical short section with the same distance is cut, and the group pair is arranged. The method needs to find the center of the pipeline firstly, and the measurement error of final cutting is larger because the center of the pipeline is not well determined.

Therefore, the existing connection method for the equal-diameter space dislocation pipeline is complex in calculation or large in measurement error, and needs to be further improved.

Disclosure of Invention

The invention aims to overcome the defects of the prior art, and provides a method for connecting spatially offset isodiametric pipelines based on measurement of deflection angles and offset.

In order to achieve the above purpose, the invention adopts the following technical scheme:

the method for connecting the space dislocation equal-diameter pipelines based on the measurement of deflection angle and offset comprises the following steps:

Step 1: determining intersecting lines of the respective end parts of the space dislocation pipelines P1 and P2 when the space dislocation pipelines P1, the middle transition pipe P3 and the space dislocation pipeline P2 with equal diameters are intersected and penetrated in sequence;

step 2: determining a transition pipe intersecting line at two ends of the middle transition pipe P3, which are intersected with the space dislocation pipelines P1 and P2 respectively;

step 3: cutting the end parts of the space dislocation pipelines P1 and P2 according to the intersecting line determined in the step 1;

cutting the two end parts of the middle transition pipe P3 according to the transition pipe intersecting line determined in the step 2;

step 4: grinding the cut edges of the cut intermediate transition pipe P3, the space dislocation pipeline P1 and the space dislocation pipeline P2;

step 5: and matching and fixedly connecting the grinded intermediate transition pipe P3, the space dislocation pipeline P1 and the space dislocation pipeline P2.

Preferably, in the step 1, the plane where the intersecting line of the end portion of the spatially offset pipe P1 is located has only one intersection point with the outer circumference of the end face of the spatially offset pipe P1;

in the step 1, the plane where the intersecting line of the end part of the space dislocation pipeline P2 is located has only one intersection point with the outer circumference of the end face of the space dislocation pipeline P2.

Preferably, in the step 1, the method for determining the intersecting line of the respective ends of the spatially offset pipes P1, P2 includes the following steps:

Step 11: respectively marking circumferential base lines perpendicular to respective central axes on the outer wall surfaces of the space dislocation pipelines P1 and P2 and the outer wall surface of the intermediate transition pipe P3;

step 12: drawing a plurality of angle baselines perpendicular to the respective circumference baselines on the outer wall surfaces of the straight-mouth cutting ends of the space dislocation pipelines P1 and P2 along the circumference direction;

step 13: the deflection angles of the spatially offset pipes P1, P2 are measured and the diametrical symmetry point is determined, by the following method:

one side of the digital display universal angle ruler is clung to the surface of the space dislocation pipeline P1, and is enabled to be parallel to an angle base line of the space dislocation pipeline P1, and the ruler surface with scales on the side is kept to be perpendicular to the surface of the space dislocation pipeline P1; simultaneously aligning the vertex of the digital display universal angle ruler with the end face of the straight opening cutting end of the space dislocation pipeline P1, enabling the other side of the digital display universal angle ruler to rotate to the edge of the straight opening end face of the space dislocation pipeline P2, and recording the angle displayed by the digital display universal angle ruler;

the digital display universal angle ruler is moved along the circumferential direction of the outer wall surface of the space dislocation pipeline P1, and the angle number displayed by the digital display universal angle ruler changes along with the change of the position of the edge of the straight port end surface of the space dislocation pipeline P2 where the other side of the digital display universal angle ruler is lapped in the moving process;

After the digital display universal angle ruler moves for one circle, finding out the position of the digital display universal angle ruler when the display angle is maximum, and taking the displayed maximum angle as an initial value 2 alpha (0) of the deflection angle of the space dislocation pipeline P1;

at the position of measuring an initial value 2 alpha (0), a base line perpendicular to a circumference base line of the space dislocation pipeline P1 is marked on the outer wall surface of the space dislocation pipeline P1 along one side of the digital display universal angle ruler, the intersection point of the base line and the straight-mouth cutting end surface of the space dislocation pipeline P1 is marked as A, and the point A is the cutting longest position point of the space dislocation pipeline P1;

determining the diameter symmetry point of the point A as A1, wherein A1 is the non-cutting point of the space dislocation pipeline P1;

meanwhile, at the position of measuring the initial value 2 alpha (0), marking the lap joint intersection point of the other side of the digital display universal angle ruler and the space dislocation pipeline P2 as P, and marking a straight line PQ perpendicular to the circumference base line of the space dislocation pipeline P2 along the P point;

obtaining an initial value 2 beta (0) of the deflection angle of the space dislocation pipeline P2 and a longest cutting position point B of the space dislocation pipeline P2 by the same method, and confirming that a diameter symmetry point B1 of the point B is a non-cutting point of the space dislocation pipeline P2, and marking a straight line B1N perpendicular to a circumferential base line of the space dislocation pipeline P2 along the point B1;

Measuring the offset: measuring the offset l of the projection of the straight line B1N and the straight line PQ on the same cross section of the space dislocation pipeline P2 along the outer wall surface of the space dislocation pipeline P2, wherein l is the arc length along the circumference base line between the straight line B1N and the straight line PQ on the space dislocation pipeline P2;

step 14: iterative measurement is carried out on an initial value 2 alpha (0) of the deflection angle of the space dislocation pipeline P1 so as to obtain a value of an included angle alpha between a plane n1 where an intersecting line between the space dislocation pipeline P1 and the intermediate transition pipe P3 is positioned and the end face of the space dislocation pipeline P1;

performing iterative measurement on an initial value 2β (0) of the deflection angle of the space dislocation pipeline P2 to obtain a value of an included angle β between a plane n2 where an intersecting line between the space dislocation pipeline P2 and the intermediate transition pipe P3 is located and the end face of the space dislocation pipeline P2;

step 15: calculating the longest cutting length CL1 of the space dislocation pipeline P1 and the longest cutting length CL2 of the space dislocation pipeline P2 according to the values of alpha and beta in the step 14;

wherein cl1=d×tan α, d is the outer diameter of the spatially offset pipe P1 or the spatially offset pipe P2 or the intermediate transition pipe P3; marking a point O1 on an angle base line passing through the point A in the space dislocation pipeline P1 according to the value of CL1, wherein the length of AO1 is equal to the value of CL 1;

cl2=d×tan β, d is the outer diameter of the spatially offset pipe P1 or the spatially offset pipe P2 or the intermediate transition pipe P3; based on the value of CL2, the O2 point is marked on the angular base line passing through the B point in the spatially offset pipe P2, where the BO2 length is equal to the value of CL 2.

Step 16: in the 'oblique circular tube expansion' in the sheet metal expansion drawing on the 'mobile phone sheet metal expansion' app, the mobile phone sheet metal expansion app causes

Inner diameter of round tube = inner diameter of spatially dislocated tube P1;

the length=length one of the end section, the length one is the length along the axial direction between the circle center of the end face of the truncated pipeline after the space dislocation pipeline P1 is cut and the circumference base line on the space dislocation pipeline P1, and the length one is obtained in the mobile phone sheet metal unfolding app through conversion of the vertical length between the A1 and the circumference base line on the space dislocation pipeline P1;

bevel angle = value of α;

plate thickness = wall thickness of spatially offset pipe P1;

obtaining a 16-equal-division unfolding dimension diagram I of a finished pipe blanking of the space dislocation pipeline P1;

drawing 16 measuring lines I which equally divide the circumference base line and are perpendicular to the circumference base line on the outer wall surface of the space dislocation pipeline P1, wherein one measuring line passes through the point A1 on the space dislocation pipeline P1, and the other measuring line passes through the point A on the space dislocation pipeline P1;

the measurement line passing through the point A1 corresponds to the longest dimension line in the 16 equally-divided expansion dimension graph I, the measurement line passing through the point A corresponds to the shortest dimension line in the 16 equally-divided expansion dimension graph I, and the rest measurement lines sequentially correspond to the rest dimension lines in the 16 equally-divided expansion dimension graph I;

Measuring a first cutting point corresponding to the length of a corresponding dimension line in the first 16-equal-division unfolding dimension map along the direction of each measuring line by taking the circumferential base line side of the space dislocation pipeline P1 as an endpoint;

and connecting the obtained cutting points to obtain intersecting lines of the space dislocation pipeline P1.

Step 17: in the 'oblique circular tube expansion' in the sheet metal expansion drawing on the 'mobile phone sheet metal expansion' app, the mobile phone sheet metal expansion app causes

The inner diameter of the circular tube = the inner diameter of the spatially offset tube P2;

the length of the end section=length two, the length two is the length along the axial direction between the circle center of the end face of the truncated pipeline after the space dislocation pipeline P2 is cut and the circumference base line on the space dislocation pipeline P2, and the length two is obtained in the mobile phone sheet metal unfolding app through conversion of the vertical length between B1 and the circumference base line on the space dislocation pipeline P2;

bevel angle = β value;

plate thickness = wall thickness of spatially dislocated pipe P2;

obtaining a 16-equal-division unfolding dimension chart II of the finished pipe blanking of the space dislocation pipeline P2;

drawing 16 measuring lines II which equally divide the circumference baseline and are perpendicular to the circumference baseline on the outer wall surface of the space dislocation pipeline P2, wherein one measuring line II passes through a point B1 on the space dislocation pipeline P2, and the other measuring line II passes through a point B on the space dislocation pipeline P2;

The measurement line II passing through the point B1 is corresponding to the longest dimension line in the 16 equally-spread dimension graph II, the measurement line II passing through the point B is corresponding to the shortest dimension line in the 16 equally-spread dimension graph II, and the rest measurement lines are sequentially corresponding to the rest dimension lines in the 16 equally-spread dimension graph II;

measuring a second cutting point corresponding to the length of the corresponding dimension line in the second dimension line of the 16-equal-division unfolding dimension map along the second measuring line by taking the circumferential base line side of the space dislocation pipeline P2 as an endpoint;

connecting the obtained cutting points II to obtain intersecting lines of the space dislocation pipeline P2;

and acquiring an intersection point S point of the intersecting line and the PQ on the circumference of the intersecting line of the space dislocation pipeline P2, and measuring the length ML between the S point on the space dislocation pipeline P2 and the O1 point on the space dislocation pipeline P1.

Preferably, in the step 11, the method for marking out the circumferential base line includes: the circumference of the space dislocation pipeline P1 or the space dislocation pipeline P2 or the middle transition pipe P3 is wrapped by a non-extensible equal-width binding belt or an electric heating belt, the tail ends of the space dislocation pipeline P1 or the space dislocation pipeline P2 or the middle transition pipe P3 are partially overlapped, a circumference base line on the corresponding pipeline is obtained by scribing along the circumference on one side of the equal-width binding belt or the electric heating belt, and the plane of the scribed circumference base line is perpendicular to the pipeline axis.

Preferably, in the step 13, a waxed paper tape folding method is used to determine a diameter symmetry point A1 of the point a:

Tightly pasting and winding the waxed paper tape along the circumference of the outer wall surface of the space dislocation pipeline P1, overlapping the tail ends, and folding at the position overlapped with the head end to make marks;

then the waxed paper tape is disassembled, and after the head end and the folding mark are folded in half, the waxed paper tape is folded in half for a plurality of times until the waxed paper tape between the head end and the folding mark is folded in half to 16 parts;

then tightly pasting and winding the waxed paper tape folded into 16 equal parts along the circumference of the outer wall surface of the space dislocation pipeline P1, wherein one crease is aligned with an angle baseline passing through the point A, the crease opposite to the crease passing through the point A is the crease where the point A1 is positioned, and the intersection point of the crease where the point A1 is positioned and the cutting end surface of the space dislocation pipeline P1 is the diameter symmetry point A1 of the point A;

the same waxed paper tape folding method is adopted to determine the diameter symmetry point B1 of the point B.

Preferably, in the step 14, the method for obtaining the α value is as follows:

step 1411: from the value 2α (i) of the deflection angle of the spatially offset pipe P1, according to CL1 _i D×tan α (i), where d is the spatially offset pipe P1 or the spatially offset pipe P2 or the intermediate passThe outer diameter of the transition pipe P3 was used to obtain CL1 _i Is a value of (2);

step 1412: according to CL1 _i Is marked with O1 on the angle base line passing the point A in the space dislocation pipeline P1 _i Point, where AO1 _i Length of (2) is equal to CL1 _i Is a value of (2);

step 1413: one side of the digital display universal angle ruler is parallel to AO1 _i And keep the scale surface on the side vertical to the surface of the pipeline, so that the vertex of the digital display universal angle scale and O1 _i The other side of the digital display universal angle ruler is rotated to the edge of the straight port end face of the space dislocation pipeline P2 by point alignment, the angle displayed by the digital display universal angle ruler is recorded and used as an iteration value 2 alpha (i+1) of the deflection angle of the space dislocation pipeline P1 to be substituted into a formula CL1 _i+1 ＝d×tanα(i+1)；

Step 1414: when |CL1 _i+1- CL1 _i When i is greater than the first setting error (i=0, 1,2 … n, n is greater than or equal to 0), repeating steps 1411 to 1414 by i=i+1;

when |CL1 _i+1- CL1 _i When the I is less than or equal to a first setting error (i=0, 1,2 … n, n is more than or equal to 0), taking the value of alpha (i+1) as the value of an included angle alpha between a plane n1 where an intersecting line between the space dislocation pipeline P1 and the middle transition pipe P3 is positioned and the end face of the space dislocation pipeline P1;

wherein the first setting error takes a value of 3-5mm.

Preferably, in the step 14, the method for obtaining the β value is as follows:

step 1421: from the value 2β (j) of the deflection angle of the spatially offset pipe P2, according to CL2 _j =d×tan β (j), and CL2 is obtained _j Is a value of (2);

step 1422: according to CL2 _j Is marked with O2 on the angle base line passing through the point B in the space dislocation pipeline P2 _j Points, where BO2 _j Length of (2) is equal to CL2 _j Is a value of (2);

step 1423: one side of the digital display universal angle ruler is parallel to BO2 _j And keep the scale surface on the side vertical to the surface of the pipeline, so that the vertex of the digital display universal angle scale and O2 _j The other side of the digital display universal angle ruler is rotated to be lapped on the straight opening of the space dislocation pipeline P1 by aligning the pointsThe edge of the end face records the angle displayed by a digital display universal angle ruler, and is used as an iteration value 2 beta (j+1) of the deflection angle of the space dislocation pipeline P2 to be substituted into a formula CL2 _j+1 ＝d×tanβ(j+1)；

Step 1424: when |CL2 _j+1- CL2 _j When j=0, 1,2 … n, n is equal to or greater than 0, | > the second setting error, j=j+1 is set, and steps 1421 to 1424 are repeated;

when |CL1 _j+1- CL1 _j When the I is less than or equal to the second setting error (j=0, 1,2 … n, n is more than or equal to 0), taking the value of beta (j+1) as the value of an included angle beta between a plane n2 where an intersecting line between the space dislocation pipeline P2 and the middle transition pipe P3 is positioned and the end face of the space dislocation pipeline P2;

wherein the second setting error takes a value of 3-5mm.

Preferably, in the step 2, the method for determining the intersecting line of the intermediate transition pipe P3, in which both ends of the intermediate transition pipe are respectively matched with the intersecting lines of the spatially offset pipes P1 and P2, is as follows:

step 21: in the 'oblique circular tube expansion' in the sheet metal expansion drawing on the 'mobile phone sheet metal expansion' app, the mobile phone sheet metal expansion app causes

Inner diameter of round tube = inner diameter of intermediate transition tube P3;

the length of the end section=the length III, the length III is the length along the axial direction between the circle center of the end face of the inclined section pipeline and the circumferential base line on the middle transition pipeline P3 after the middle transition pipeline P3 is connected with the space dislocation pipeline P1 and the side is cut, and the length III is obtained by converting the vertical length between the straight end face of the side connected with the space dislocation pipeline P1 and the circumferential base line on the middle transition pipeline P3 through the middle transition pipeline P3 in the mobile phone sheet metal unfolding app;

bevel angle = value of α;

plate thickness = wall thickness of intermediate transition pipe P3;

obtaining a 16-equal-division unfolding dimension chart III of the finished pipe blanking of the intermediate transition pipe P3;

marking 16 measuring lines III which equally divide the circumference baseline and are perpendicular to the circumference baseline on the circumference baseline in the middle transition pipe P3 and the outer wall surface between the connecting side end surface of the middle transition pipe P3 and the space dislocation pipeline P1;

the 16 measurement lines III sequentially correspond to the size lines in the 16 equally-divided unfolding size diagram III;

measuring a cutting point III corresponding to the length of the corresponding dimension line in the 16-equal-division unfolding dimension map III along the three directions of each measuring line by taking the circumferential base line side of the middle transition pipe P3 as an end point;

the three connecting lines of the obtained cutting points are used for obtaining the intersecting line of the transition pipe on the side, connected with the space dislocation pipeline P1, of the middle transition pipe P3;

Meanwhile, a cutting point III positioned on the outer circumference of the straight end face of the middle transition pipe P3 is marked as a C1 point, and the C1 point is a non-cutting point; the opposite cutting point III on the circumference of the point C1 is marked as a point C, and the point C corresponds to a point on a measuring line III at the position of the longest cutting position of the side connected with the space dislocation pipeline P1 on the middle transition pipe P3;

step 22: calculating the distance ML2 between the straight mouth end surface of the connecting side of the middle transition pipe P3 and the space dislocation pipeline P2 and the circumference base line on the middle transition pipe P3;

ML2＝ML+CL1-L _C1 -L _{gap of} ；

L _C1 Is the vertical distance between point C1 and the circumferential baseline on the intermediate transition pipe P3;

L _{gap of} The fit clearance value is 2-3mm;

step 23: in the 'oblique circular tube expansion' in the sheet metal expansion drawing on the 'mobile phone sheet metal expansion' app, the mobile phone sheet metal expansion app causes

the length of the end section=length IV, the length IV is the length along the axial direction between the circle center of the end face of the inclined section pipeline and the circumferential base line on the middle transition pipeline P3 after the middle transition pipeline P3 is connected with the space dislocation pipeline P2 and cut, and the length IV is obtained by converting the distance ML2 between the straight end face of the side connected with the space dislocation pipeline P2 and the circumferential base line on the middle transition pipeline P3 through the middle transition pipeline P3 in the mobile phone sheet metal unfolding app;

Bevel angle = β value;

plate thickness = wall thickness of intermediate transition pipe P3;

obtaining a 16-equal-division unfolding dimension chart IV of the finished pipe blanking of the intermediate transition pipe P3;

step 24: an angle base line CF passing through a point C is drawn on the middle transition pipe P3, the point F is the intersection point of the angle base line CF and a circumference base line on the middle transition pipe P3, and the angle base line CF is a symmetrical mapping line of a straight line PQ;

measuring offset l to point E along the circumferential base line of the intermediate transition pipe P3 by taking point F as a starting point according to the deflection direction of B1N relative to PQ, marking an angle base line through the point E, and taking the angle base line through the point E as a base line;

step 25: marking 16 measuring lines IV which are equal to the circumference baseline and perpendicular to the circumference baseline on the circumference baseline in the middle transition pipe P3 and the outer wall surface between the connecting side end surface of the middle transition pipe P3 and the space dislocation pipeline P2, and taking the reference line as one measuring line IV;

the datum line corresponds to the longest dimension line in the 16-equal-division unfolding dimension chart IV, and the rest measurement lines IV sequentially correspond to the rest dimension lines in the 16-equal-division unfolding dimension chart IV;

measuring a cutting point IV corresponding to the length of a corresponding dimension line in the 16 equally-divided unfolding dimension chart IV along four directions of each measuring line by taking the circumferential base line side of the middle transition pipe P3 as an end point, wherein the cutting point IV determined on the reference line is a point D1;

And (3) connecting the four obtained cutting points to obtain a transition pipe intersecting line on the side, connected with the space dislocation pipeline P2, of the intermediate transition pipe P3.

The beneficial effects of the invention are as follows:

according to the invention, a large amount of equation operation is not needed, and the intersecting line of the space dislocation pipeline P1, the space dislocation pipeline P2 and the middle transition pipe P3 in intersecting and intersecting can be obtained through the steps of angle measurement, marking and marking by a digital display universal angle ruler, determining an unfolded graph by a mobile phone sheet metal unfolding app and the like, so that the corresponding cutting and intersecting and connecting of the space dislocation pipeline P1, the space dislocation pipeline P2 and the middle transition pipe P3 are realized; the whole method is simple and convenient and easy to operate, and complex equation operation is not needed; by determining the included angle alpha between the plane n1 where the intersecting line between the space dislocation pipeline P1 and the middle transition pipe P3 is located and the end face of the space dislocation pipeline P1 and the included angle beta between the plane n2 where the intersecting line between the space dislocation pipeline P2 and the middle transition pipe P3 is located and the end face of the space dislocation pipeline P2, an iteration method of gradual approximation is adopted, the measurement precision is improved, and the measurement error of final cutting is reduced; meanwhile, the datum line is found out by a symmetrical offset mapping method, the whole process is simple and quick, and the simplicity and efficiency of field operation are improved.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute an undue limitation to the application.

Fig. 1 is a schematic structural view of the space dislocation pipeline P1 and the space dislocation pipeline P2 intersecting the intermediate transition pipe P3;

fig. 2 is a schematic diagram of projection of the connecting ends of the space dislocation pipeline P1 and the middle transition pipe P3 to a plane m1 where the intersecting central axes of the space dislocation pipeline P1 and the middle transition pipe P3 are located, and projection of the connecting ends of the space dislocation pipeline P2 and the middle transition pipe P3 to a plane m2 where the intersecting central axes of the space dislocation pipeline P2 and the middle transition pipe P3 are located;

FIG. 3 is a schematic view of the circumferential and angular baselines of the spatially offset pipes P1, P2 of the present invention;

FIG. 4 is a schematic illustration of a circumferential baseline on the intermediate transition pipe P3 in accordance with the present invention;

FIG. 5 is a schematic diagram of the invention when a digital display universal angle gauge is used to measure the deflection angle of the spatially offset pipeline P1;

FIG. 6 is a schematic diagram of the invention when the digital display universal angle ruler is adopted to iteratively measure the deflection angle of the spatially offset pipeline P1;

fig. 7 is a 16-equivalent expansion dimension diagram obtained in "cell phone sheet metal expansion" app;

FIG. 8 is a schematic view of the intersection line of the ends of spatially offset pipes P1, P2 according to the present invention;

FIG. 9 is a schematic view of the intersection line of the transition pipes at the two ends of the middle transition pipe in the present invention;

fig. 10 is a positional relationship diagram between points C1, C, B1, D1, and a straight line PQ when the space dislocation pipe P1, the space dislocation pipe P2, and the intermediate transition pipe P3 intersect;

FIG. 11 is a schematic illustration of the labeling of the quarter points on each intersecting line in the spatially offset pipes P1, P2;

fig. 12 is a schematic illustration of the four equally divided points on each intersecting line in the intermediate transition pipe P3.

Detailed Description

It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.

The invention will be further described with reference to the drawings and examples.

when the space dislocation pipeline P1, the intermediate transition pipe P3 and the space dislocation pipeline P2 are equal-diameter pipelines and are intersected, according to the principle of intersection of pipelines:

as shown in fig. 1, the central axis of the intersection of the space dislocation pipeline P1 and the intermediate transition pipe P3 is located in a plane m1, the plane n1 where the intersection line is located is perpendicular to the plane m1, and as shown in fig. 2, the projection of the plane n1 on the plane m1 is a bisector L1 of an included angle between the space dislocation pipeline P1 and the intermediate transition pipe P3;

as shown in fig. 1, the central axis of the intersection of the space dislocation pipeline P2 and the intermediate transition pipe P3 is located in a plane m2, the plane n2 where the intersection line is located is perpendicular to the plane m2, and as shown in fig. 2, the projection of the plane n2 on the plane m2 is a bisector L2 of an included angle between the space dislocation pipeline P2 and the intermediate transition pipe P3;

The spatially offset pipes P1, P2 intersect the intermediate transition pipe P3, which corresponds to the end portions of the spatially offset pipes P1, P2 and both ends of the intermediate transition pipe P3 being cut out (see the broken line portion in fig. 2 for the cut-out portions), and the cut-out portions between the respective end portions of the spatially offset pipes P1, P3 are symmetrical with respect to the plane n1, and the cut-out portions between the respective end portions of the spatially offset pipes P2, P3 are symmetrical with respect to the plane n 2.

The key of realizing the connection between the space dislocation pipelines P1 and P2 in the application is to determine the intersecting line of each end part of the space dislocation pipelines P1 and P2 and the intersecting line of the transition pipes at the two ends of the middle transition pipe P3, and once the intersecting line is determined, the cutting can be performed along the intersecting line, thereby realizing the intersecting connection between the space dislocation pipelines P1, the middle transition pipe P3 and the space dislocation pipelines P2.

Preferably, in the step 1, a plane (i.e., a plane n 1) where the intersecting line of the end portion of the spatially offset pipe P1 is located has only one intersection point with the outer circumference of the end face of the spatially offset pipe P1;

in the step 1, the plane (i.e., the plane n 2) where the intersecting line of the end portion of the spatially offset pipe P2 is located has only one intersection point with the outer circumference of the end face of the spatially offset pipe P2.

That is, as shown in fig. 2, an intersection line between the spatially offset pipe P1 and the intermediate transition pipe P3 has an intersection point with the outer circumference of the end face of the spatially offset pipe P1, which is A1 in fig. 2; the intersection line between the spatially offset pipe P2 and the intermediate transition pipe P3 has an intersection point with the outer circumference of the end face of the spatially offset pipe P2, which is B1 in fig. 2.

To determine the intersecting line of the end of the spatially offset pipe P1, it is critical to determine the positions of the point A1 and the point a in fig. 2 and the maximum cutting length CL1 of the end of the spatially offset pipe P1, wherein the maximum cutting length CL1 of the end of the spatially offset pipe P1 is the distance of AO1 in fig. 2;

from the geometric relationship, cl1=d×tan α, α is the included angle between the plane n1 where the intersecting line between the spatially offset pipe P1 and the intermediate transition pipe P3 is located and the end face of the spatially offset pipe P1, and is also the included angle between n1 and the end face of the intermediate transition pipe P3;

therefore, the key to determining the intersecting line of the ends of the spatially offset pipes P1 is to determine the position of the point A1 and the point a in fig. 2 and the magnitude of α.

Similarly, to determine the intersecting line of the end of the spatially offset pipe P2, it is critical to determine the positions of the point B1 and the point B in fig. 2 and the maximum cutting length CL2 of the end of the spatially offset pipe P2, wherein the maximum cutting length CL2 of the end of the spatially offset pipe P2 is the distance of BO2 in fig. 2;

From the geometric relationship, cl2=d×tan β, β is the angle between the plane n2 where the intersecting line between the spatially offset pipe P2 and the intermediate transition pipe P3 is located and the end face of the spatially offset pipe P2, and is also the angle between n2 and the end face of the intermediate transition pipe P3;

therefore, the key to determining the plane in which the intersecting line of the ends of the spatially offset pipes P2 is to determine the position of the point B1 and the point B in fig. 2, and the size of β.

When the included angle between the plane n1 where the intersecting line between the space dislocation pipeline P1 and the intermediate transition pipe P3 is located and the end face of the space dislocation pipeline P1 is alpha, the geometric relationship indicates that the included angle between the space dislocation pipeline P1 and the intermediate transition pipe P3 is 180 ° -2α, the complement angle is 2α, and the complement angle 2α of the included angle between the space dislocation pipeline P1 and the intermediate transition pipe P3 is defined as the deflection angle of the space dislocation pipeline P1;

when the included angle between the plane n2 where the intersecting line between the space dislocation pipeline P2 and the intermediate transition pipe P3 is located and the end face of the space dislocation pipeline P2 is beta, the geometric relationship shows that the included angle between the space dislocation pipeline P2 and the intermediate transition pipe P3 is 180-2beta, the complement angle is 2beta, and the complement angle 2beta of the included angle between the space dislocation pipeline P2 and the intermediate transition pipe P3 is defined as the deflection angle of the space dislocation pipeline P2;

The determination methods of the A1 point, the position of the a point, the size of α, the B1 point, the position of the B point, and the size of β will be described in detail below.

step 11: respectively marking circumferential base lines perpendicular to respective central axes on the outer wall surfaces of the space dislocation pipelines P1 and P2 and the outer wall surface of the intermediate transition pipe P3; wherein, the circumferential base lines drawn on the outer wall surfaces of the space dislocation pipelines P1 and P2 are shown in figure 3, and the circumferential base lines drawn on the outer wall surface of the middle transition pipe P3 are shown in figure 4;

specifically, in the step 11, the method for drawing the circumferential base line includes: the circumference of the space dislocation pipeline P1 or the space dislocation pipeline P2 or the middle transition pipe P3 is wrapped by a non-extensible equal-width binding belt or an electric heating belt, the tail ends of the space dislocation pipeline P1 or the space dislocation pipeline P2 or the middle transition pipe P3 are partially overlapped, a circumference base line on the corresponding pipeline is obtained by scribing along the circumference on one side of the equal-width binding belt or the electric heating belt, and the plane of the scribed circumference base line is perpendicular to the pipeline axis.

Step 12: drawing a plurality of angle baselines perpendicular to the respective circumference baselines on the outer wall surfaces of the straight-mouth cutting ends of the space dislocation pipelines P1 and P2 along the circumference direction; wherein the angle baselines drawn on the outer wall surfaces of the space dislocation pipelines P1 and P2 are shown in figure 3; in general, the angle base line can be drawn only by a few lines near the position of the maximum deflection angle, and the digital display universal angle ruler can be adjusted by reference when the maximum deflection angle is measured;

as shown in fig. 5, one side of the digital display universal angle ruler is clung to the surface of the space dislocation pipeline P1, and is parallel to the angle base line of the space dislocation pipeline P1, and the ruler surface with scales on the side is kept perpendicular to the surface of the space dislocation pipeline P1, namely the plane of the ruler surface passes through the central axis of the space dislocation pipeline P1; simultaneously aligning the vertex of the digital display universal angle ruler with the end face of the straight opening cutting end of the space dislocation pipeline P1, enabling the other side of the digital display universal angle ruler to rotate to the edge of the straight opening end face of the space dislocation pipeline P2, and recording the angle displayed by the digital display universal angle ruler;

the digital display universal angle ruler is moved along the circumferential direction of the outer wall surface of the space dislocation pipeline P1, and in the moving process, the angle displayed by the digital display universal angle ruler is changed along with the change of the edge position of the straight port end surface of the space dislocation pipeline P2 where the other side of the digital display universal angle ruler is lapped; when the digital display universal angle ruler moves along the circumference of the P1, the other side of the digital display universal angle ruler can not be taken on the end face of the P2 due to the position relation of the spatially staggered pipelines P1 and P2, and no reading is performed at the moment, so that only the part which can be taken on the end face is measured, and the reading can be performed only when the other side of the digital display universal angle ruler can be taken on the end face of the P2; it can be proved from the theoretical model that the maximum value of the angle measured by the part which can not be overlapped is equal to the maximum value of the deflection angle measured by the part which can be overlapped, namely the maximum value is equivalent to the measurement of the inner sharp angle and the outer sharp angle of the same elbow. That is, the degree of the inner sharp angle is convenient to measure, and the angle of the outer sharp angle is inconvenient to measure because the measuring tool is not telescopic;

After the digital display universal angle ruler moves for one circle, the position of the digital display universal angle ruler when the display angle is maximum is found out, wherein the reading of the digital display universal angle ruler can be set as the deflection angle reading of the space dislocation pipeline P1 (the setting method comprises the steps that the digital display universal angle ruler horizontally expands for 180 degrees and then returns the angle to zero, and then the angle is measured), and the displayed maximum angle is used as an initial value 2 alpha (0) of the deflection angle of the space dislocation pipeline P1;

determining the diameter symmetry point of the point A as A1, namely the point which is 180 degrees away from the point A on the circumferential base line where the point A is positioned, namely the symmetry point in the circumferential diameter direction of the end surface of the pipeline, wherein A1 is the non-cutting point of the spatially staggered pipeline P1, namely the sharp corner inflection point of the elbow; the measurement principle of the deflection angle is that the simulated pipelines intersect, only one plane passes through the axes of the two intersecting pipelines, and the deflection angle of the pipelines is the largest at the moment; when one side of the digital display universal angle ruler moves along the circumference of a pipeline in parallel with the axis, the other side of the digital display universal angle ruler is equivalent to an angle baseline of the outer circumference of the middle transition pipe P3, and the maximum deflection angle position, namely the point A, can be found by moving the angle ruler; in addition, before measurement, the straight end faces of P1 and P2 are firstly trimmed to enable the end faces to be parallel to respective circumference base lines;

in the same method, one side of a digital display universal angle ruler is tightly attached to the surface of a P2 pipeline in parallel, the ruler surface is kept perpendicular to the surface of the P2 pipeline, meanwhile, the vertex of the digital display universal angle ruler is aligned with the straight-mouth end surface of the P2 pipeline, the other side of the digital display universal angle ruler is rotated to the edge of the straight-mouth end surface of a space dislocation pipeline P1, the position where the maximum deflection angle is located is measured and recorded by the digital display universal angle ruler, an initial value 2 beta (0) of the deflection angle of the space dislocation pipeline P2 and the longest cutting position point B of the space dislocation pipeline P2 are obtained, the diameter symmetry point B1 and the diameter symmetry point B1 of the point B are confirmed to be non-cutting points of the space dislocation pipeline P2, and a straight line B1N perpendicular to the circumferential base line of the space dislocation pipeline P2 is marked along the point B1;

specifically, in the step 13, a waxed paper tape folding method is adopted to determine a diameter symmetry point A1 of the point a:

Compared with a method for finding symmetrical points by measuring the end surface diameter of the end surface by using a tape measure, the waxed paper tape paper folding method has higher precision; meanwhile, the 16 bisectors can be drawn onto the pipeline according to the folds of the paper tape, so as to prepare for the 16 bisectors on the pipeline.

specifically, in the step 14, the method for obtaining the α value is as follows:

step 1411: from the value 2α (i) of the deflection angle of the spatially offset pipe P1, according to CL1 _i D×tan α (i), where d is the outer diameter of spatially offset pipe P1 or spatially offset pipe P2 or intermediate transition pipe P3, to obtain CL1 _i Is a value of (2);

step 1413: as shown in FIG. 6, one side of the digital display universal angle ruler is parallel to AO1 _i And keep the scale surface on the side vertical to the surface of the pipeline, so that the vertex of the digital display universal angle scale and O1 _i The other side of the digital display universal angle ruler is aligned with the pointRotating to the edge of the straight end face of the space dislocation pipeline P2, recording the angle displayed by a digital display universal angle ruler, and substituting the angle as an iteration value 2 alpha (i+1) of the deflection angle of the space dislocation pipeline P1 into a formula CL1 _i+1 ＝d×tanα(i+1)；

wherein the first set error takes a value of 3-5mm, and the first set error is about the fit clearance value of the pipeline.

Specifically, in the step 14, the method for obtaining the β value is as follows:

step 1423: one side of the digital display universal angle ruler is parallel to BO2 _j And keep the scale surface on the side vertical to the surface of the pipeline, so that the vertex of the digital display universal angle scale and O2 _j The other side of the digital display universal angle ruler is rotated to the edge of the straight port end face of the space dislocation pipeline P1 by point alignment, the angle displayed by the digital display universal angle ruler is recorded and used as an iteration value 2 beta (j+1) of the deflection angle of the space dislocation pipeline P2 to be substituted into a formula CL2 _j+1 ＝d×tanβ(j+1)；

When |CL2 _j+1- CL2 _j The second setting error is less than or equal to j=0, 1,2 … n,n is more than or equal to 0), taking the value of beta (j+1) as the value of an included angle beta between a plane n2 where an intersecting line between the space dislocation pipeline P2 and the middle transition pipe P3 is positioned and the end face of the space dislocation pipeline P2;

wherein the second setting error takes a value of 3-5mm, and the second setting error is about the pipeline fit clearance value.

wherein cl1=d×tan α, d is the outer diameter of the spatially offset pipe P1 or the spatially offset pipe P2 or the intermediate transition pipe P3; marking a point O1 on an angle base line passing through the point A in the space dislocation pipeline P1 according to the value of CL1, wherein the length of AO1 is equal to the value of CL1, as shown in FIG. 2;

cl2=d×tan β, d is the outer diameter of the spatially offset pipe P1 or the spatially offset pipe P2 or the intermediate transition pipe P3; based on the value of CL2, the O2 point is marked on the angular base line passing through the B point in the spatially offset pipe P2, where BO2 has a length equal to the value of CL2, as shown in fig. 2.

Inner diameter of round tube = inner diameter of spatially dislocated tube P1;

the length=length one of the end section, the length one is the length along the axial direction between the circle center of the end face of the truncated pipeline after the space dislocation pipeline P1 is cut and the circumference base line on the space dislocation pipeline P1, and the length one is obtained in the mobile phone sheet metal unfolding app through conversion of the vertical length between the A1 and the circumference base line on the space dislocation pipeline P1; the length one acquisition method comprises the following steps: in the "oblique circular tube expansion" in the sheet metal expansion diagram on the "mobile phone sheet metal expansion" app, the value of vertical length, bevel angle=α, sheet thickness=wall thickness of the space dislocation pipeline P1 between the inner diameter of the circular tube=the space dislocation pipeline P1, end section length=a1 and the circumferential base line on the space dislocation pipeline P1 is set as a length one, and the minimum length dimension value in the obtained expansion diagram is set as a length one;

bevel angle = value of α;

plate thickness = wall thickness of spatially offset pipe P1;

obtaining a first 16-equal-division unfolding dimension chart of the finished pipe blanking of the space dislocation pipeline P1, wherein the 16-equal-division unfolding dimension chart obtained in the app is generally shown in fig. 7, the leftmost dimension line and the rightmost dimension line are the same, and the numerical value of the dimension line marked in fig. 7 can be changed according to the different inputs of the inner diameter of a circular pipe, the length of an end section, the angle of a bevel and the thickness of a plate;

As shown in fig. 8, 16 measurement lines I which are equally divided by a circumference base line and are perpendicular to the circumference base line are drawn on the outer wall surface of the space dislocation pipeline P1, wherein the measurement lines I are parallel to the angle base line on the space dislocation pipeline P1, and the drawing of the 16 measurement lines I can be obtained by drawing points through 16 equally divided folds by adopting a waxed paper folding method, wherein one measurement line passes through the point A1 on the space dislocation pipeline P1, and one measurement line passes through the point A on the space dislocation pipeline P1;

measuring a first cutting point corresponding to the length of a corresponding dimension line in the first 16-equal-division unfolding dimension map along the direction of each measuring line by taking the circumferential base line side of the space dislocation pipeline P1 as an endpoint; the point A1 corresponds to one cutting point I, namely a non-cutting point of the spatially dislocated pipeline P1;

and connecting the obtained cutting points to obtain intersecting lines of the space dislocation pipeline P1, wherein the intersecting lines are cutting lines of the space dislocation pipeline P1. The intersecting lines formed by the first cutting point and the first cutting point are shown in fig. 8, and 16 measuring lines and 16 first cutting points are not shown in fig. 8, but only a few of them are shown.

the length of the end section=length two, the length two is the length along the axial direction between the circle center of the end face of the truncated pipeline after the space dislocation pipeline P2 is cut and the circumference base line on the space dislocation pipeline P2, and the length two is obtained in the mobile phone sheet metal unfolding app through conversion of the vertical length between B1 and the circumference base line on the space dislocation pipeline P2; the length II acquisition method comprises the following steps: in the "oblique circular tube expansion" in the sheet metal expansion diagram on the "mobile phone sheet metal expansion" app, the value of vertical length between the inner diameter of the circular tube=the inner diameter of the space dislocation pipeline P2, the end section length=b1 and the circumferential base line on the space dislocation pipeline P2, the value of bevel angle=β, the plate thickness=the wall thickness of the space dislocation pipeline P2 is set as a minimum length dimension value in the acquired expansion diagram as a length two;

bevel angle = β value;

plate thickness = wall thickness of spatially dislocated pipe P2;

as shown in fig. 8, 16 measurement lines two which are equally divided by a circumference baseline and are perpendicular to the circumference baseline are drawn on the outer wall surface of the space dislocation pipeline P2, wherein the measurement lines two are parallel to the angle baseline on the space dislocation pipeline P2, and the drawing of the 16 measurement lines two can be obtained by drawing points through 16 equally divided folds by adopting a waxed paper folding method, wherein one measurement line two passes through a point B1 on the space dislocation pipeline P2, namely one measurement line is the point B1N in fig. 9, and the other measurement line two passes through a point B on the space dislocation pipeline P2;

measuring a second cutting point corresponding to the length of the corresponding dimension line in the second dimension line of the 16-equal-division unfolding dimension map along the second measuring line by taking the circumferential base line side of the space dislocation pipeline P2 as an endpoint; the point B1 corresponds to one cutting point II, namely a non-cutting point of the space dislocation pipeline P2;

the obtained second cutting points are connected to obtain intersecting lines of the space dislocation pipeline P2, wherein the intersecting lines are the cutting lines of the space dislocation pipeline P2, the intersecting lines formed by connecting the second cutting points and the second cutting points are shown in fig. 8, 16 measuring lines and 16 second cutting points are not shown in fig. 8, and only a few of the intersecting lines are shown;

the length of the end section=the length III, the length III is the length along the axial direction between the circle center of the end face of the inclined section pipeline and the circumferential base line on the middle transition pipeline P3 after the middle transition pipeline P3 is connected with the space dislocation pipeline P1 and the side is cut, and the length III is obtained by converting the vertical length between the straight end face of the side connected with the space dislocation pipeline P1 and the circumferential base line on the middle transition pipeline P3 through the middle transition pipeline P3 in the mobile phone sheet metal unfolding app; the length III acquisition method comprises the following steps: in the "oblique circular tube expansion" in the metal plate expansion diagram on the "mobile phone metal plate expansion" app, the inner diameter of the circular tube=the inner diameter of the middle transition tube P3, the end section length=the vertical length between the straight mouth end surface of the connecting side of the middle transition tube P3 and the space dislocation pipeline P1 and the circumferential base line on the middle transition tube P3, the value of the oblique mouth angle=α, the thickness of the plate=the wall thickness of the middle transition tube P3, and the minimum length dimension value in the obtained expansion diagram is taken as a length three;

bevel angle = value of α;

plate thickness = wall thickness of intermediate transition pipe P3;

Marking 16 measurement lines III which are equally divided into the circumference base line and are perpendicular to the circumference base line on the outer wall surface between the circumference base line in the middle transition pipe P3 and the side end surface of the middle transition pipe P3 connected with the space dislocation pipeline P1, wherein the marking of the 16 measurement lines III can be obtained by marking points through 16 equally divided folds by adopting a waxed paper tape folding method;

measuring a cutting point III corresponding to the length of a corresponding dimension line in a 16-equal-division unfolding dimension chart III along three directions of each measuring line by taking the circumferential base line side of the middle transition pipe P3 as an endpoint, wherein one cutting point III is one endpoint on the outer circumference of the straight port end face of the side of the middle transition pipe P3 and is marked as C1, as shown in FIG. 9;

connecting the obtained cutting points three to obtain a transition pipe intersecting line on the side, connected with the space dislocation pipeline P1, of the intermediate transition pipe P3, wherein the intersecting line is a cutting line on the side, connected with the space dislocation pipeline P1, of the intermediate transition pipe P3, the transition intersecting line formed by connecting the cutting points three and the cutting points three is shown in fig. 9, 16 measuring lines three and 16 cutting points three are not shown in fig. 9, and only a few of the intersecting lines are shown;

meanwhile, a cutting point III on the outer circumference of the straight end surface of the middle transition pipe P3 is marked as a C1 point, the C1 point is a non-cutting point (the matching clearance is zero after splicing and coincides with the A1 point), the cutting point III on the circumference of the C1 point is marked as a C point, and the C point corresponds to a point on a measuring line III on the position of the middle transition pipe P3, which is connected with the space dislocation pipeline P1 and is used for cutting the longest position;

ML2＝ML+CL1-L _C1 -L _{gap of} ；

L _C1 The vertical distance between the C1 point and the circumferential base line on the middle transition pipe P3, namely the length of the longest dimension line in the 16 equally-divided unfolded dimension graph III;

L _{gap of} The fit clearance value is 2-3mm;

the length of the end section=length IV, the length IV is the length along the axial direction between the circle center of the end face of the inclined section pipeline and the circumferential base line on the middle transition pipeline P3 after the middle transition pipeline P3 is connected with the space dislocation pipeline P2 and cut, and the length IV is obtained by converting the distance ML2 between the straight end face of the side connected with the space dislocation pipeline P2 and the circumferential base line on the middle transition pipeline P3 through the middle transition pipeline P3 in the mobile phone sheet metal unfolding app; the length IV acquisition method comprises the following steps: in the "oblique circular tube expansion" in the sheet metal expansion diagram on the "mobile phone sheet metal expansion" app, the values of the inner diameter of the circular tube=the inner diameter of the middle transition tube P3, the end section length=ml 2, the bevel angle=β, the plate thickness=the wall thickness of the middle transition tube P3 are set as the minimum length dimension value in the acquired expansion diagram as the length four;

Bevel angle = β value;

plate thickness = wall thickness of intermediate transition pipe P3;

step 24: as shown in fig. 9, an angle baseline CF passing through the point C is drawn on the intermediate transition pipe P3, the point F is the intersection point of the angle baseline CF and the circumferential baseline on the intermediate transition pipe P3, and the angle baseline CF is the symmetrical mapping line of the straight line PQ;

measuring offset l to point E along the circumferential base line of the intermediate transition pipe P3 by taking point F as a starting point according to the deflection direction of B1N relative to PQ, marking an angle base line through the point E, and taking the angle base line through the point E as a base line; the reference line is found out by a symmetrical offset mapping method, the whole process is simple and quick, and the simplicity and efficiency of field operation are improved.

Step 25: marking 16 measuring lines IV which are equal to the circumference baseline and perpendicular to the circumference baseline on the circumference baseline in the middle transition pipe P3 and the outer wall surface between the connecting side end surface of the middle transition pipe P3 and the space dislocation pipeline P2, and taking the reference line as one measuring line IV; the four measurement lines can be marked by a waxed paper tape folding method through 16 equally-divided folds to obtain points;

Measuring a cutting point IV corresponding to the length of a corresponding dimension line in the 16 equally-divided expanded dimension chart IV along four directions of each measuring line by taking the circumferential base line side of the middle transition pipe P3 as an end point, wherein the cutting point IV determined on the reference line is a point D1, and the distance from the point D1 to the circumferential base line on the middle transition pipe P3 is ML2;

connecting the obtained cutting points four to obtain a transition pipe intersecting line on the side, connected with the space dislocation pipeline P2, of the intermediate transition pipe P3, wherein the intersecting line is a cutting line on the side, connected with the space dislocation pipeline P2, of the intermediate transition pipe P3, the transition intersecting line formed by connecting the cutting points four and the cutting points four is shown in fig. 9, 16 measuring lines four and 16 cutting points four are not shown in fig. 9, and only a few of the intersecting lines are shown; when the spatially offset pipes P1, P2 and the intermediate transition pipe P3 intersect, the positional relationship among the points C1, C, B1, D1 and the straight line PQ is shown in fig. 10.

before cutting, the dimensions are checked first to determine whether the positions of intersecting lines between the space dislocation pipeline P1 and the intermediate transition pipe P3, and between the space dislocation pipeline P2 and the intermediate transition pipe P3 are matched, and the method is as follows:

As shown in fig. 11, the point A1, the point O1 and the remaining two four equally divided points K1 and H1 are obtained on the intersecting line circumference of the spatially offset pipe P1;

as shown in fig. 11, the point B1, the point O2 and the remaining four equal division points K2 and H2 are obtained on the intersecting line circumference of the spatially offset pipe P2, and the point S1 of symmetry of the point S is obtained on the intersecting line circumference of the spatially offset pipe P2;

as shown in fig. 12, four quarter points of C1 point, C point, K3 point and H3 point are obtained on the circumference of the intersecting line of the intermediate transition pipe P3 and the transition pipe on the connecting side of the space dislocation pipeline P1; four quarter points of a point D1, a point D, a point K4 and a point H4 are obtained on the circumference of a transition pipe intersecting line on the connecting side of the middle transition pipe P3 and the space dislocation pipeline P2; acquiring an intersection point G point of an intersecting line and CF on the circumference of a transition pipe intersecting line on the side where the middle transition pipe P3 is connected with the space dislocation pipeline P2, and acquiring a symmetrical point G1 point of the G point on the circumference of the transition pipe intersecting line on the side where the middle transition pipe P3 is connected with the space dislocation pipeline P2;

measuring the distances among A1O2, O1B1, K1K2 and H1H2 between the space dislocation pipeline P1 and the space dislocation pipeline P2; the distance between the measurement O1S, A1S1 should also be supplemented in consideration of the influence of the offset;

measuring the distance between C1D, CD, K3K4 and H3H4 on the space dislocation pipeline P3; taking the influence of the offset into consideration, the distance between CG and C1G1 is also measured in a complementary manner;

Calculating a difference between a distance between A1O2 and a distance between C1D, a difference between a distance between O1B1 and a distance between CD1, a difference between a distance between K1K2 and a distance between K3K4, a difference between a distance between H1H2 and a distance between H3H4, a difference between a distance between O1S and a distance between CG, and a difference between a distance between A1S1 and a distance between C1G 1; the focus is to look at the difference between the distance between H1H2 and the distance between H3H4, because here the error tends to accumulate larger.

If the absolute value of each difference value is within the error range (2-5 mm), cutting can be performed; otherwise, re-measuring the scribing and correcting the measuring error.

wherein the associated pipe measurement markings during cutting and grinding should be preserved in order to find the corresponding mating reference points and reference lines.

In addition, when the distance between the space dislocation pipelines P1 and P2 is smaller, the end part of the space dislocation pipeline is cut off according to the operable space on site and the length of the digital display universal angle square arm, so that the corner of the elbow is gentle, namely the maximum deflection angle is smaller than 45 degrees. Therefore, the flow loss and the impact in the pipeline can be reduced, and meanwhile, the effective measurement and the splicing and positioning on site are realized; when the distance between the space dislocation pipelines P1 and P2 is far, the distance is limited to the length of the digital display universal angle square arm, and effective measurement can be realized by lengthening one of the square arms (bonding a straight ruler by using an adhesive tape).

According to the invention, a large amount of equation operation is not needed, and the intersecting line of the space dislocation pipeline P1, the space dislocation pipeline P2 and the middle transition pipe P3 in intersecting and intersecting can be obtained through the steps of angle measurement, marking and marking by a digital display universal angle ruler, determining an unfolded graph by a mobile phone sheet metal unfolding app and the like, so that the corresponding cutting and intersecting and connecting of the space dislocation pipeline P1, the space dislocation pipeline P2 and the middle transition pipe P3 are realized; the whole method is simple and convenient and easy to operate, and complex equation operation is not needed; when determining the included angle alpha between the plane n1 where the intersecting line between the space dislocation pipeline P1 and the middle transition pipe P3 is located and the end face of the space dislocation pipeline P1 and the included angle beta between the plane n2 where the intersecting line between the space dislocation pipeline P2 and the middle transition pipe P3 is located and the end face of the space dislocation pipeline P2, an iteration method of gradual approximation is adopted, the measurement precision is improved, and the measurement error of final cutting is reduced; meanwhile, the datum line is found out by a symmetrical offset mapping method, the whole process is simple and quick, and the simplicity and efficiency of field operation are improved.

While the foregoing is directed to embodiments of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow.

Claims

1. The method for connecting the space dislocation equal-diameter pipelines based on the measurement of deflection angle and offset is characterized by comprising the following steps of:

step 5: matching and fixedly connecting the grinded intermediate transition pipe P3, the space dislocation pipeline P1 and the space dislocation pipeline P2;

in the step 1, the plane where the intersecting line of the end part of the space dislocation pipeline P1 is located has only one intersection point with the outer circumference of the end face of the space dislocation pipeline P1;

in the step 1, the plane where the intersecting line of the end part of the space dislocation pipeline P2 is located has only one intersection point with the outer circumference of the end face of the space dislocation pipeline P2;

In the step 1, the method for determining the intersecting line of the respective end parts of the spatially offset pipelines P1 and P2 comprises the following steps:

cl2=d×tan β, d is the outer diameter of the spatially offset pipe P1 or the spatially offset pipe P2 or the intermediate transition pipe P3; marking an O2 point on an angle base line passing through the point B in the space dislocation pipeline P2 according to the value of CL2, wherein the length of BO2 is equal to the value of CL2;

Inner diameter of round tube = inner diameter of spatially dislocated tube P1;

bevel angle = value of α;

plate thickness = wall thickness of spatially offset pipe P1;

connecting the obtained cutting points to obtain intersecting lines of the space dislocation pipeline P1;

bevel angle = β value;

plate thickness = wall thickness of spatially dislocated pipe P2;

2. The method for connecting spatially offset isodiametric pipes based on the measured deflection angle and offset according to claim 1, wherein in the step 11, the method for drawing the circumferential base line is as follows: the circumference of the space dislocation pipeline P1 or the space dislocation pipeline P2 or the middle transition pipe P3 is wrapped by a non-extensible equal-width binding belt or an electric heating belt, the tail ends of the space dislocation pipeline P1 or the space dislocation pipeline P2 or the middle transition pipe P3 are partially overlapped, a circumference base line on the corresponding pipeline is obtained by scribing along the circumference on one side of the equal-width binding belt or the electric heating belt, and the plane of the scribed circumference base line is perpendicular to the pipeline axis.

3. The method for connecting spatially offset isodiametric pipes based on the measured deflection angle and offset according to claim 1, wherein in the step 13, a waxed paper tape folding method is used to determine a diameter symmetry point A1 of the point a:

4. The method for connecting spatially offset isodiametric pipes based on the measured deflection angle and offset according to claim 1, wherein in the step 14, the method for obtaining the α value is as follows:

Wherein the first setting error takes a value of 3-5mm.

5. The method for connecting spatially offset isodiametric pipes based on the measured deflection angle and offset according to claim 4, wherein in step 14, the method for obtaining the β value is as follows:

Step 1424: when |CL2 _j+1 -CL2 _j When j=0, 1,2 … n, n is equal to or greater than 0, | > the second setting error, j=j+1 is set, and steps 1421 to 1424 are repeated;

when |CL1 _j+1 -CL1 _j When the I is less than or equal to the second setting error (j=0, 1,2 … n, n is more than or equal to 0), taking the value of beta (j+1) as the value of an included angle beta between a plane n2 where an intersecting line between the space dislocation pipeline P2 and the middle transition pipe P3 is positioned and the end face of the space dislocation pipeline P2;

Wherein the second setting error takes a value of 3-5mm.

6. The method for connecting spatially offset isodiametric pipes based on the measured deflection angle and offset according to claim 5, wherein in the step 2, the method for determining the intersecting line of the intermediate transition pipe P3, which is matched with the intersecting line of each of the spatially offset pipes P1 and P2, is as follows:

bevel angle = value of α;

plate thickness = wall thickness of intermediate transition pipe P3;

ML2＝ML+CL1-L _C1 -L _{gap of} ；

L _{gap of} The fit clearance value is 2-3mm;

bevel angle = β value;

plate thickness = wall thickness of intermediate transition pipe P3;