Superposition angle measurement method and measurement system for elbow installation

Abstract

The invention relates to the technical field of pipeline installation, in particular to a superposition angle measuring method and a superposition angle measuring system for elbow installation, and the superposition angle measuring method and the superposition angle measuring system are characterized in that axial lead position finders are respectively arranged at ports of two straight pipes which need to be provided with elbows, and a digital display laser inclinometer is arranged at the intersection of the axial leads of the two straight pipes; wherein laser emitted by the laser device on one straight pipe is projected to the central point of the digital display laser inclinometer, the digital display laser inclinometer is turned on, the inclination angle of the digital display laser inclinometer is adjusted, and the digital display laser inclinometer is rotated, so that the laser emitted by the digital display laser inclinometer is projected to the axis of the other straight pipe; and a superposition angle for elbow installation can be obtained. According to the measuring method and the measuring system, the measuring mode is simple, and the problem that an existing measuring method has certain limitation can be effectively solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pipeline installation, in particular to a superimposed angle measuring method and system for elbow installation. BACKGROUND

[0002] In the construction of gas extraction and transportation pipeline projects, pipeline installation in flat terrain generally adopts advanced planning, terrain reconnaissance, determination of pipeline route, then measurement, line laying, trench excavation, design department designs route map and prepares construction results table, construction party preps pipeline according to the results table, and materials are issued by site material workers according to pile number on the results table, and installation is performed by construction personnel, which is relatively simple. In Sichuan Basin or hilly areas, the terrain undulates greatly, and pipeline layout in some places is performed by manual shoulder lifting, which greatly increases the difficulty of pipeline installation.

[0003] In the construction of small-diameter gas extraction and transportation pipeline projects in Sichuan Basin or hilly areas, the layout is complex and there are many elbows. Small-diameter pipelines are generally constructed manually, and workers perform on-site material preparation according to the terrain, and use a level, a tape measure, a plummet, and an angle ruler to complete the measurement. According to the requirements of the Industrial Metal Pipeline Engineering Construction Specification, when connecting straight pipes, if there is a bend, it must be straightened to maintain the straightness of the steel pipe, and the misalignment of the pipe alignment should not exceed 20% of the pipe wall thickness. If the traditional manual alignment method is used for pipeline emergency rescue work, the measurement is slow and inaccurate, resulting in long construction time and long pipeline gas stop time. Moreover, the level, tape measure, plummet, and angle ruler are traditional tools that require personnel to cooperate with each other, and the technical requirements for the installation workers are relatively high during pipe replacement and connection operations, and the tacit understanding of mutual cooperation is very important.

[0004] In the prior art, a Chinese patent document with publication number CN108444409A and publication date August 24, 2018 is disclosed, and the technical solution disclosed in the patent document is as follows: A pressure-bearing pipeline bending angle measuring device and method, the pipeline includes a bent pipe section and two straight pipe sections located on both sides of the bent pipe section and connected to the bent pipe section, the measuring device includes a conical angle ruler and at least two lasers emitting a "cross" laser beam, since the present application uses a "cross" laser beam parallel to the two straight pipe sections of the pressure-bearing elbow and a conical angle ruler for measurement.

[0005] The above technical solution can only calculate the bending angle of the elbow between two straight pipes in the same plane, and the measurement has certain limitations, and the measuring device and the measuring method are complex. SUMMARY

[0006] To solve the above technical problems, the application provides a superimposed angle measuring method and system for elbow installation, and provides a simple measuring method and effectively solves the problem that the existing measuring method has certain limitations.

[0007] The application is realized by adopting the following technical scheme: A superimposed angle measuring method for elbow installation, comprising the following steps: S1. When an elbow needs to be installed between two straight pipes, an axial line positioner is installed at the port of each of the two straight pipes, and the laser emitted by the laser in the axial line positioner coincides with the axial line of the straight pipe; S2. The number of elbows that need to be installed between the two straight pipes is determined, and if it is one, step S3 is entered; S3. A digital laser inclination instrument is installed at the intersection of the axial lines of the two straight pipes, and the laser emitted by the laser on one of the straight pipes is projected onto the center point of the digital laser inclination instrument; S4. The digital laser inclination instrument is turned on, the inclination angle of the digital laser inclination instrument is adjusted, and the digital laser inclination instrument is rotated so that the laser emitted by the digital laser inclination instrument is projected onto the axial line of the other straight pipe; S5. The superimposed angle of the elbow installation is determined, which includes the unloading angle of the elbow and the rotation angle of the elbow; the angle of rotation of the digital laser inclination instrument is determined as the unloading angle of the elbow, and the display data on the digital laser inclination instrument is determined as the rotation angle of the elbow.

[0008] When the number of elbows that need to be installed between the two straight pipes is determined to be two in step S2, the following steps are entered: S 21 . It is determined whether the two straight pipes are located in the same plane, and if so, step S 22 is entered; S 22 . In the same direction, the two elbows are set to be a first elbow and a second elbow in sequence, and the two straight pipes are set to be a first straight pipe and a second straight pipe in sequence; S 23 . The digital laser inclination instrument is installed on the axial line of the first straight pipe, and the reflector is installed on the axial line of the second straight pipe; within the range of the curvature radius of the elbow, the distance between the digital laser inclination instrument and the port of the first straight pipe is adjusted, the distance between the reflector and the port of the second straight pipe is adjusted, and the digital laser inclination instrument is rotated so that the laser emitted by the digital laser inclination instrument is projected onto the reflector and reflected to the axial line of the second straight pipe by the reflector; S 24 . The rotation angle of the digital laser inclination instrument is determined as the unloading angle of the first elbow, and the included angle between the incident light and the reflected light on the reflector is determined as the unloading angle of the second elbow.

[0009] When step S 21 judges that the two straight pipes are not located in the same plane, the following steps are entered: S 25 . Steps S 22 ~ S 24 are repeated to determine the laying angle of the first elbow and the laying angle of the second elbow; S 26 . The arc length of the first elbow and the second elbow along the central axis direction is calculated respectively; S 27 . An intermediate straight pipe is arranged between the first elbow and the second elbow, and the laying length of the intermediate straight pipe is calculated; S 28 . The first elbow and the intermediate straight pipe are processed, and the first straight pipe, the first elbow and the intermediate straight pipe are connected in sequence; S 29 . An axis center line positioner is installed at the port of the intermediate straight pipe, and the laser emitted by the laser in the axis center line positioner coincides with the axis center line; S 30 . Steps S3-S5 are repeated to determine the rotation angle of the second elbow.

[0010] 4. The calculation method of the arc length L of the elbow along the central axis direction is as follows: L=a*laying angle of the elbow*pipe diameter*curvature radius of the elbow In the formula, a is a constant.

[0011] A superimposed angle measuring system for elbow installation includes an axis center line positioner and a digital display laser inclination instrument group; the axis center line positioner includes a fixed disc, a rotating disc, a laser, at least two clamping jaws, and a locking piece corresponding to each clamping jaw; the fixed disc and the rotating disc are coaxially and concentrically arranged, and the rotating disc is rotationally connected to the fixed disc; the laser is fixed at the center of the fixed disc; the fixed disc is further provided with sliding rails corresponding to the clamping jaws in the radial direction, and the clamping jaws are respectively slidingly arranged in the sliding rails; the rotating disc is further provided with a spiral groove corresponding to the locking piece, and the locking piece includes a locking rod and a nut, one end of the locking rod is connected to the clamping jaw, and the other end passes through the spiral groove and is connected to the nut, for driving the clamping jaw to move synchronously along the corresponding sliding rail and locking the position of the clamping jaw.

[0012] The clamping jaw is further provided with sandpaper.

[0013] The sliding rail is further provided with a roller.

[0014] A plurality of through holes are formed in the fixed disc.

[0015] The digital display laser inclinometer assembly includes a tripod, with a mounting base rotatably connected to the upper surface of the tripod. The digital display laser inclinometer is fixed on the mounting base. The upper surface of the tripod is also provided with angle scale lines, and the mounting base is also provided with a pointer that matches the angle scale lines.

[0016] It also includes a reflector mounting bracket and a reflector; the reflector is fixed on the reflector mounting bracket, and the reflector mounting bracket is also provided with an angle scale for measuring the angle between the incident light and the reflected light on the reflector.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This measurement method can measure not only the superimposed angle of an elbow installation between two straight pipes located in the same plane, but also the superimposed angle of an elbow installation between two straight pipes located in different planes. The superimposed angle includes the elbow's cutting angle and rotation angle, making the measurement of elbow installation more comprehensive and improving the success rate of elbow installation.

[0018] In this measurement method, the centerline of the pipe can be quickly located using a centerline positioning instrument with a laser. The superimposed angle of the elbow installation is measured based on the centerline of the straight pipe. Combined with the settings of the digital display laser inclinometer, the measurement of the superimposed angle of the elbow installation is more accurate, reducing material cutting errors, and is faster and more convenient, saving time.

[0019] 2. Furthermore, when installation between two straight pipes cannot be completed using only one bend, this invention can also achieve installation by setting an intermediate straight pipe and two bends between the two straight pipes. This method can quickly determine the overlap angle of the two bends, improving the applicability of this measurement method. In particular, it can significantly improve the construction efficiency and quality of long-distance pipeline installation in the Sichuan Basin or hilly areas, reducing construction time and pipeline downtime. This will help improve the overall safety and reliability of the pipeline project. Precise material cutting and prefabrication ensure welding quality, effectively eliminating forced assembly and avoiding stress concentration that could cause serious defects such as weld cracks.

[0020] This measurement method reduces errors and inaccuracies in manual alignment, lowers the requirements for alignment accuracy, and greatly saves pipeline alignment time. Compared with current construction techniques, it is expected to reduce construction time by more than half, reduce pipeline failure rectification time, and improve economic efficiency.

[0021] Specifically, if traditional tools are used for measurement, the previous material cutting method would require at least 3 pipe fitters and 2 assistants; with this method, only 2 pipe fitters are needed, reducing the number of workers by 3 and reducing costs: each pipe fitter costs 600 yuan / day, and each assistant costs 180 yuan / day, resulting in a saving of approximately 1,000 yuan / day.

[0022] Using the previous material cutting method, taking D159 as an example, it would take at least 8 hours (including welding) for a back-and-forth bend and 6 hours for a straight pipe. With this method, a back-and-forth bend can be completed in 6 hours (including welding), and a straight pipe in 3 hours. This effectively reduces gas outage time by 2-3 hours per incident. It also allows for earlier restoration of gas supply to users. Based on a daily gas supply of 20.0 × 10⁴ m³ / d, a 3-hour gas outage results in a gas loss of 2.5 × 10⁴ m³ / h. With an average natural gas price of 2.20 yuan / m³, this translates to savings of 55,000 yuan per incident.

[0023] This saves 6,500 yuan in labor and vehicle costs plus 55,000 yuan in natural gas costs, resulting in a single-trip saving of 61,500 yuan. Taking the Luzhou operation area as an example, there are 5 pipeline connections per month, 60 times per year, resulting in annual savings of 3.69 million yuan.

[0024] 3. The measurement system of the present invention has a simple structure. Through the cooperation of the various structures, it can complete the superimposed angle measurement for bend installation in various terrains. The method of use is simple, fast and accurate.

[0025] 4. The jaws are also equipped with sandpaper, which can increase friction and improve clamping stability.

[0026] 5. The slide rail is also equipped with rollers to improve the smoothness of the claw movement.

[0027] 6. The fixed plate has several through holes, which helps to reduce the weight of the fixed plate and makes it easier to hold when using the axis positioning instrument, thus improving the convenience of use. Attached Figure Description

[0028] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments, wherein: Figure 1 This is a schematic diagram of the measurement method in this invention. Figure 1 ; Figure 2 This is a schematic diagram of the measurement method in this invention. Figure 2 ; Figure 3 This is a schematic diagram of the planar structure of the rotating disk in the axis positioning instrument of the present invention; Figure 4 This is a schematic cross-sectional view of the fixed disk in the centerline positioning instrument of the present invention; Figure 5 This is a schematic diagram of the planar structure of the fixed disk in the axis positioning instrument of the present invention; Figure 6 This is a schematic diagram of the digital display laser tilt meter assembly in this invention; Figure 7This is a schematic diagram of the reflector mounting bracket and the reflector in this invention; Marked in the image: 1. Fixed plate, 2. Rotary plate, 3. Laser fixture, 4. Claw, 5. Locking element, 6. Slide rail, 7. Spiral groove, 8. Through hole, 9. Tripod, 10. Digital display laser inclinometer, 11. Pointer, 12. Full circle protractor, 13. Reflector holder, 14. Reflector, 15. First straight tube, 16. Second straight tube, 17. Middle straight tube, 18. Axis centerline positioning device, 19. First elbow, 20. Second elbow. Detailed Implementation

[0029] Example 1 As a basic embodiment of the present invention, the present invention includes a method for measuring the superimposed angle for elbow installation, comprising the following steps: S1. When it is necessary to install an elbow between two straight pipes; install a centerline locator 18 at the ends of the two straight pipes respectively, and the laser emitted by the laser in the centerline locator 18 coincides with the centerline of the straight pipe.

[0030] S2. Determine the number of elbows that need to be installed between the two straight pipes. If it is one, proceed to step S3.

[0031] S3. A digital display laser inclinometer 10 is installed at the intersection of the centerlines of the two straight tubes, and the laser emitted by the laser on one of the straight tubes is projected onto the center point of the digital display laser inclinometer 10.

[0032] S4. Turn on the digital display laser inclinometer 10, adjust the tilt angle of the digital display laser inclinometer 10, and rotate the digital display laser inclinometer 10 so that the laser emitted by the digital display laser inclinometer 10 is projected onto the axis of another straight tube.

[0033] S5. Determine the overlapping angle for elbow installation, wherein the overlapping angle includes the elbow's blanking angle and the elbow's rotation angle. The rotation angle of the digital display laser inclinometer 10 is determined to be the elbow's blanking angle, and the displayed data on the digital display laser inclinometer 10 is determined to be the elbow's rotation angle.

[0034] The centerline locator 18 and the digital laser inclinometer 10 can employ conventional techniques in the art. The measurement method of this embodiment does not require any modification to the structure of the centerline locator 18 and the digital laser inclinometer 10.

[0035] Example 2 In a preferred embodiment of the present invention, the present invention includes a method for measuring the superimposed angle for elbow installation, comprising the following steps: S1. When it is necessary to install an elbow between two straight pipes; install a centerline locator 18 at the ends of the two straight pipes respectively, and the laser emitted by the laser in the centerline locator 18 coincides with the centerline of the corresponding straight pipe.

[0036] S2. Determine the number of elbows required between the two straight pipes. If there are two, proceed to step S. 21 .

[0037] S 21 Determine if the two straight pipes are in the same plane. If so, proceed to step S. 22 .

[0038] S 22 Along the same direction, two bends are designated as the first bend 19 and the second bend 20, and two straight pipes are designated as the first straight pipe 15 and the second straight pipe 16.

[0039] S 23 A digital display laser inclinometer 10 is installed on the axis of the first straight pipe 15, and a reflector 14 is installed on the axis of the second straight pipe 16. Within the radius of curvature of the bend, the distance between the digital display laser inclinometer 10 and the port of the first straight pipe 15 is adjusted, and the distance between the reflector 14 and the port of the second straight pipe 16 is adjusted. The digital display laser inclinometer 10 is rotated so that the laser emitted by the digital display laser inclinometer 10 is projected onto the reflector 14 and reflected by the reflector 14 to the axis of the second straight pipe 16.

[0040] S 24 The rotation angle of the digital display laser tilt meter 10 is determined as the feeding angle of the first bend 19, and the angle between the incident light and the reflected light on the reflector 14 is determined as the feeding angle of the second bend 20.

[0041] Example 3 In another preferred embodiment of the present invention, the present invention includes a method for measuring the superimposed angle for elbow installation, comprising the following steps: S1. When it is necessary to install an elbow between two straight pipes; install a centerline locator 18 at the ends of the two straight pipes respectively, and the laser emitted by the laser in the centerline locator 18 coincides with the centerline of the straight pipe.

[0042] S2. Determine the number of elbows required between the two straight pipes. If there are two, proceed to step S. 21 .

[0043] S 21 Determine if the two straight pipes are in the same plane. If not, proceed to step S. 25 .

[0044] Step S 25Along the same direction, two bends are designated as the first bend 19 and the second bend 20, respectively, and two straight pipes are designated as the first straight pipe 15 and the second straight pipe 16, respectively. A first digital display laser inclinometer is installed on the axis of the first straight pipe 15, and a reflector 14 is installed on the axis of the second straight pipe 16. Within the radius of curvature of the bends, the distance between the first digital display laser inclinometer and the port of the first straight pipe 15 is adjusted, and the distance between the reflector 14 and the port of the second straight pipe 16 is adjusted. The first digital display laser inclinometer is rotated so that the laser emitted by the first digital display laser inclinometer is projected onto the reflector 14 and reflected by the reflector 14 to the axis of the second straight pipe 16. The rotation angle of the first digital display laser inclinometer is determined as the blanking angle of the first bend 19, and the angle between the incident light and the reflected light on the reflector 14 is determined as the blanking angle of the second bend 20.

[0045] Step S 26. Calculate the arc lengths of the first bend 19 and the second bend 20 along the central axis.

[0046] Step S 27 An intermediate straight pipe 17 is installed between the first bend 19 and the second bend 20. The cutting length of the intermediate straight pipe 17 is calculated.

[0047] Step S 28 Machin the first elbow 19 and the intermediate straight pipe 17, and connect the first straight pipe 15, the first elbow 19 and the intermediate straight pipe 17 together in sequence.

[0048] Step S 29 A centerline locator 18 is installed at the port of the intermediate straight tube 17, and the laser emitted by the laser inside the centerline locator 18 coincides with the centerline of the intermediate straight tube 17.

[0049] Step S 30 A second digital display laser inclinometer is installed at the intersection of the centerlines of the intermediate straight pipe 17 and the second straight pipe 16. The laser emitted from the laser on the intermediate straight pipe 17 is projected onto the center point of the second digital display laser inclinometer. The second digital display laser inclinometer is turned on, its tilt angle is adjusted, and it is rotated so that the laser emitted by the second digital display laser inclinometer is projected onto the centerline of the second straight pipe 16. The displayed data on the second digital display laser inclinometer is confirmed as the rotation angle of the second elbow 20.

[0050] Example 4 In another preferred embodiment of the present invention, the present invention includes a superimposed angle measurement system for elbow installation, comprising a centerline locator 18 and a digital display laser inclinometer assembly. The centerline locator 18 includes a fixed disk 1, a rotating disk 2, a laser, two jaws 4, and locking elements 5 corresponding to the two jaws 4. The fixed disk 1 and the rotating disk 2 are coaxially and concentrically arranged, with the rotating disk 2 rotatably connected to the fixed disk 1. The laser is fixed at the center of the fixed disk 1. The fixed disk 1 is also provided with radially arranged slide rails 6 corresponding to the jaws 4, and the jaws 4 are slidably disposed in the slide rails 6. The rotating disk 2 is also provided with two spiral grooves 7 corresponding to the locking elements 5. The locking elements 5 include a locking rod and a nut. One end of the locking rod is connected to the jaw 4, and the other end passes through the spiral groove 7 and is connected to the nut, used to drive the jaws 4 to move synchronously along the corresponding slide rails 6 and lock the position of the jaws 4.

[0051] Example 5 In another preferred embodiment of the present invention, the present invention includes a superimposed angle measurement system for elbow installation, comprising a centerline locator 18, a digital display laser inclinometer group, a reflector mounting bracket 13, and a reflector 14.

[0052] The axis positioning device 18 includes a fixed disk 1, a rotating disk 2, a laser, four jaws 4, and locking components 5 corresponding to each of the four jaws 4. The fixed disk 1 and the rotating disk 2 are coaxially and concentrically arranged, with the rotating disk 2 rotatably connected to the fixed disk 1. Specifically, the fixed disk 1 and the rotating disk 2 can achieve concentricity and coaxiality through the cooperation of concentric tracks and concentric rollers, thereby reducing the frictional resistance of the rotating disk 2.

[0053] Refer to the instruction manual appendix Figure 4 Included with instruction manual Figure 5 The fixed disk 1 is also welded with four radially arranged slide rails 6 corresponding to the jaws 4, used to drive the jaws 4 to perform linear motion. Rollers are also provided on the slide rails 6. The laser can be fixed in the central hole of the fixed disk 1 using an existing laser clamp 3. The laser clamp 3 can be a four-jaw centering chuck. The rotating disk 2 also has a central hole, so that the laser emitted by the laser coincides with the axis of the fixed disk 1 and the rotating disk 2, and can be emitted outwards. The laser battery, which works with the laser, can be placed on the fixed disk 1 and powered by an existing power bank, and is equipped with a switch for convenient use of the laser.

[0054] Refer to the instruction manual appendix Figure 3The rotating disk 2 has four spiral grooves 7, each corresponding to a locking element 5. The locking element 5 includes a locking rod and a nut. One end of the locking rod is connected to the pawl 4, and the other end passes through the spiral groove 7 and is connected to the nut. The locking rod is used to drive the pawl 4 to move synchronously along the corresponding slide rail 6 and lock the position of the pawl 4.

[0055] Furthermore, the fixed disk 1 has several through holes 8, which serves two purposes: firstly, to reduce the overall weight, and secondly, to facilitate gripping.

[0056] Furthermore, the jaws 4 are also equipped with sandpaper to increase friction and improve the stability of the jaws 4 clamping.

[0057] Refer to the instruction manual appendix Figure 6 The digital laser inclinometer assembly includes a tripod 9. A mounting base is rotatably connected to the upper surface of the tripod 9. A digital laser inclinometer 10 is fixed on the mounting base. An angle scale is also provided on the upper surface of the tripod 9, and a pointer 11 matching the angle scale is also provided on the mounting base. The digital laser inclinometer 10 and the pointer 11 rotate synchronously. In this embodiment, the angle scale can be implemented by setting a full-circle protractor 12 on the tripod 9.

[0058] Refer to the instruction manual appendix Figure 7 The reflector 14 is fixed on the reflector mounting bracket 13, and the reflector mounting bracket 13 is also provided with an angle scale line (not shown in the figure) for measuring the angle between the incident light and the reflected light on the reflector 14.

[0059] Example 6 In another preferred embodiment of the present invention, the present invention includes a method for measuring the superimposed angle of elbow installation, which can be used for measuring and pipework operations on all-terrain pipe elbows. When an elbow needs to be installed between two straight pipes, the two straight pipes are a first straight pipe 15 and a second straight pipe 16. The measurement method includes the following steps: S1. A centerline locator 18 is installed at the port of the first straight pipe 15 and the second straight pipe 16, respectively. The laser emitted by the laser inside the centerline locator 18 coincides with the centerline of the corresponding straight pipe. The centerline locator 18 adopts the structure of Embodiment 4 or Embodiment 5. The locking member 5 moves along the spiral groove 7, the rotating disk 2 rotates, further driving the four jaws 4 to move synchronously along the slide rail 6 in a straight line.

[0060] S2. Determine the number of elbows required between the first straight pipe 15 and the second straight pipe 16. If there is one, proceed to step S3. If there are two, proceed to step S4. 21 .

[0061] S3. Refer to the instruction manual appendix. Figure 1A digital display laser inclinometer assembly is installed at the intersection of the centerlines of the first straight tube 15 and the second straight tube 16. The laser emitted by the laser on the first straight tube 15 is projected onto the center point of the digital display laser inclinometer 10 in the assembly. The digital display laser inclinometer assembly adopts the structure in Embodiment 5.

[0062] S4. Turn on the digital display laser inclinometer 10, adjust the tilt angle of the digital display laser inclinometer 10 by adjusting the tripod 9, and rotate the digital display laser inclinometer 10 so that the laser emitted by the digital display laser inclinometer 10 is projected onto the axis of the second straight tube 16.

[0063] S5. Determine the superimposed angle of the elbow installation and end the measurement. The superimposed angle includes the elbow's blanking angle and its rotation angle. The rotation angle of the digital laser inclinometer 10 is determined as the elbow's blanking angle, and the displayed data on the digital laser inclinometer 10 is determined as the elbow's rotation angle.

[0064] S 21 Determine whether the first straight pipe 15 and the second straight pipe 16 are located in the same plane. If so, proceed to step S. 22 If not, proceed to step S. 25 .

[0065] S 22 Refer to the instruction manual appendix. Figure 2 Along the same direction, two bends are designated as the first bend 19 and the second bend 20, respectively.

[0066] S 23 A digital display laser inclinometer 10 is installed on the axis of the first straight pipe 15, and a reflector 14 is installed on the axis of the second straight pipe 16. Within the radius of curvature of the bend, the distance between the digital display laser inclinometer 10 and the port of the first straight pipe 15 is adjusted, and the distance between the reflector 14 and the port of the second straight pipe 16 is adjusted. The digital display laser inclinometer 10 is rotated so that the laser emitted by the digital display laser inclinometer 10 is projected onto the reflector 14 and reflected by the reflector 14 to the axis of the second straight pipe 16.

[0067] S 24 At this point, the elbow has no rotation angle. Determine the rotation angle of the digital display laser inclinometer 10 as the feeding angle of the first elbow 19, and determine the angle between the incident light and the reflected light on the reflector 14 as the feeding angle of the second elbow 20. Then, end the measurement.

[0068] S 25 Repeat step S. 22 ~ S 24 Determine the material feeding angle of the first bend 19 and the material feeding angle of the second bend 20.

[0069] S26 Calculate the arc length L of the first bend 19 and the second bend 20 along the central axis direction: L = a * elbow cutting angle * pipe diameter * elbow radius of curvature In the formula, a is a constant. In this embodiment, a is taken as 0.017453.

[0070] S 27 An intermediate straight pipe 17 is set between the first bend 19 and the second bend 20. The cutting length of the intermediate straight pipe 17 is calculated based on the distance between the digital display laser tilt meter 10 and the reflector 14, as well as the arc length of the first bend 19 and the second bend 20 along the central axis.

[0071] S 28 Machin the first elbow 19 and the intermediate straight pipe 17, and connect the first straight pipe 15, the first elbow 19 and the intermediate straight pipe 17 together in sequence.

[0072] S 29 A centerline locator 18 is installed at the port of the intermediate straight tube 17, and the laser emitted by the laser inside the centerline locator 18 coincides with the centerline of the intermediate straight tube 17.

[0073] S 30 Repeat steps S3 to S5 to determine the rotation angle of the second bend 20.

[0074] In summary, any other corresponding modifications made by those skilled in the art after reading this invention document, without requiring creative mental effort, based on the technical solutions and concepts of this invention, are all within the scope of protection of this invention.

Claims

1. A method for measuring the superimposed angle of an elbow installation, characterized in that: Includes the following steps: S1. When it is necessary to install an elbow between two straight pipes; install a centerline locator (18) at the ends of the two straight pipes respectively, and the laser emitted by the laser in the centerline locator (18) coincides with the centerline of the straight pipe; S2. Determine the number of elbows that need to be installed between the two straight pipes. If it is one, proceed to step S3. S3. Install a digital display laser inclinometer (10) at the intersection of the centerlines of the two straight tubes, and project the laser emitted by the laser on one of the straight tubes onto the center point of the digital display laser inclinometer (10); S4. Turn on the digital display laser tilt meter (10), adjust the tilt angle of the digital display laser tilt meter (10), rotate the digital display laser tilt meter (10) so that the laser emitted by the digital display laser tilt meter (10) is projected to the axis of another straight tube. S5. Determine the superimposed angle of the elbow installation, the superimposed angle including the elbow blanking angle and the elbow rotation angle; determine the rotation angle of the digital display laser inclinometer (10) as the elbow blanking angle, and determine the displayed data on the digital display laser inclinometer (10) as the elbow rotation angle.

2. The method for measuring the superimposed angle for elbow installation according to claim 1, characterized in that: If step S2 determines that two elbows are needed between the two straight pipes, proceed to the following steps: S 21 Determine if the two straight pipes are in the same plane. If so, proceed to step S. 22 ; S 22 Along the same direction, two bends are designated as the first bend (19) and the second bend (20) in sequence, and two straight pipes are designated as the first straight pipe (15) and the second straight pipe (16) in sequence. S 23 Install a digital laser inclinometer (10) on the axis of the first straight tube (15) and a reflector (14) on the axis of the second straight tube (16). Within the radius of curvature of the bend, adjust the distance between the digital laser inclinometer (10) and the port of the first straight tube (15), adjust the distance between the reflector (14) and the port of the second straight tube (16), and rotate the digital laser inclinometer (10) so that the laser emitted by the digital laser inclinometer (10) is projected onto the reflector (14) and reflected by the reflector (14) to the axis of the second straight tube (16). S 24 The rotation angle of the digital laser tilt meter (10) is determined as the feeding angle of the first bend (19), and the angle between the incident light and the reflected light on the reflector (14) is determined as the feeding angle of the second bend (20).

3. The method for measuring the superimposed angle for elbow installation according to claim 2, characterized in that: When step S 21 If it is determined that the two straight pipes are not in the same plane, proceed to the following steps: S 25 Repeat step S. 22 ~ S 24 Determine the material feeding angle of the first bend (19) and the material feeding angle of the second bend (20); S 26 Calculate the arc lengths of the first bend (19) and the second bend (20) along the central axis, respectively; S 27 An intermediate straight pipe (17) is set between the first bend (19) and the second bend (20), and the cutting length of the intermediate straight pipe (17) is calculated; S 28 Process the first elbow (19) and the intermediate straight pipe (17), and connect the first straight pipe (15), the first elbow (19) and the intermediate straight pipe (17) together in sequence; S 29 A centerline locator (18) is installed at the port of the intermediate straight tube (17), and the laser emitted by the laser inside the centerline locator (18) coincides with the centerline. S 30 Repeat steps S3 to S5 to determine the rotation angle of the second bend (20).

4. A method for measuring superimposed angles for elbow installation according to claim 3, characterized in that: The method for calculating the arc length L of the elbow along the central axis is as follows: L = a * elbow cutting angle * pipe diameter * elbow radius of curvature In the formula, a is a constant.

5. A superimposed angle measurement system for elbow installation, characterized in that: The device includes a centerline positioning device (18) and a digital display laser tilt meter assembly. The centerline positioning device (18) includes a fixed disk (1), a rotating disk (2), a laser, at least two jaws (4), and locking components (5) corresponding to the jaws (4). The fixed disk (1) and the rotating disk (2) are coaxially and concentrically arranged. The rotating disk (2) is rotatably connected to the fixed disk (1). The laser is fixed at the center of the fixed disk (1). The fixed disk (1) is also provided with a slide rail (6) arranged in the radial direction and corresponding to the jaws (4). The jaws (4) are slidably arranged in the slide rail (6). The rotating disk (2) is also provided with a spiral groove (7) corresponding to the locking component (5). The locking component (5) includes a locking rod and a nut. One end of the locking rod is connected to the jaw (4), and the other end passes through the spiral groove (7) and is connected to the nut. It is used to drive the jaws (4) to move synchronously along the corresponding slide rail (6) and lock the position of the jaws (4).

6. The superimposed angle measurement system for elbow installation according to claim 5, characterized in that: The claw (4) is also equipped with sandpaper.

7. The superimposed angle measurement system for elbow installation according to claim 5, characterized in that: The slide rail (6) is also equipped with rollers.

8. The superimposed angle measurement system for elbow installation according to claim 5, characterized in that: The fixed plate (1) has several through holes (8).

9. A superimposed angle measurement system for elbow installation according to claim 5, characterized in that: The digital display laser inclinometer assembly includes a tripod (9), with a mounting base rotatably connected to the upper surface of the tripod (9). A digital display laser inclinometer (10) is fixed on the mounting base. An angle scale line is also provided on the upper surface of the tripod (9), and a pointer (11) matching the angle scale line is also provided on the mounting base.

10. A superimposed angle measurement system for elbow installation according to claim 5, characterized in that: It also includes a reflector holder (13) and a reflector (14); the reflector (14) is fixed on the reflector holder (13), and the reflector holder (13) is also provided with an angle scale line for measuring the angle between the incident light and the reflected light on the reflector (14).

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