Measuring device for determining elbow assembling and welding position

Abstract

The invention relates to a measuring device for determining an elbow assembling and welding position, and relates to the technical field of pipeline construction. The measuring device for determining the elbow assembling and welding position comprises a guide frame component, a reducing telescopic rod assembly, a measuring center rod and a magnetostrictive displacement sensor. Compared with the prior art, the measuring device disclosed by the invention adopts the non-contact magnetostrictive displacement sensor, so that the measuring precision is improved, the working intensity of field operators is reduced, and the problem that the measuring precision is not high as the telescopic length of a measuring center rod of an existing special measuring device for determining the elbow assembling and welding position is manually measured on site is solved; the variable-diameter telescopic rod assembly adopts a structure that a connecting rod seat and a connecting rod synchronously push, each group of variable-diameter telescopic rods can simultaneously extend outwards and retract by moving the connecting rod seat, the telescopic sizes of the variable-diameter telescopic rods are ensured to be consistent, the operation is convenient, and the problems that the variable-diameter telescopic rods in the existing special measuring device for determining the elbow assembling and welding position are independently adjusted, and the working efficiency is low are solved. And the operation is tedious.

Description

Technical Field

[0001] The invention relates to the technical field of pipeline construction, and in particular to a measuring device for determining an elbow assembly welding position. Background Art

[0002] Due to the complex terrain, many elbows are needed in the construction of pipelines in mountainous areas. To a certain extent, the work efficiency of connecting the pipelines in segmented construction determines the progress of the entire project. In the past, the usual practice for connecting pipelines in mountainous areas was to measure the angle between the two straight pipe sections after cleaning the welded straight pipe sections, prefabricate the elbows required for connection, and then assemble and weld the prefabricated elbows after the pipelines were laid in the trench. The current measurement method and special measurement device for determining the welding position of elbows have effectively solved the technical difficulties of on-site measurement of welding positions during elbow welding. The main problems are low measurement accuracy and cumbersome operation.

[0003] The patent with the authorization announcement number "CN102248334B" and the patent name "A measurement method and special measuring device for determining the position of elbow welding" discloses the following content: A measurement method and special measuring device for determining the position of elbow welding, including a guide frame, a variable diameter telescopic rod, a locking nut, a measuring center rod and a fastening screw. First, adjust the telescopic dimensions of the two sets of variable diameter telescopic rods installed on the guide frame according to the size of the diameters of the first pipe section and the second pipe section that have been constructed, so that the radial dimension of the measuring device for determining the position of elbow welding is the same as the inner diameter of the constructed pipe section, and then fix the variable diameter telescopic rod with a locking nut; adjust the overhang length of the measuring center rod of the elbow welding position measuring device and fix it with a fastening screw, adjust the actual overhang length of the measuring center rod exposed outside the pipeline, so that the actual overhang length value is equal to the theoretically calculated overhang length value; after the actual overhang length value is determined, fix the measuring center rod with a fastening screw; install the two sets of elbow welding position measuring devices in the pipeline: weld the first set of elbows The position measuring device is placed in the first pipe section so that the end point of the guide frame of the elbow welding position measuring device is flush with the pipe mouth of the first pipe section; the second group of elbow welding position measuring devices are placed in the second pipe section so that the vertex of the measuring center rod of the elbow welding position measuring device intersects with the vertex of the measuring center rod of the first elbow welding position measuring device at one point; the elbow welding connection position is determined and welding is performed: the length from the pipe mouth of the second pipe section to the end point of the guide frame of the elbow welding position measuring device is measured, and after the length value is determined, the cutting position is marked on the second pipe section, and the pipe section of this length value is cut. The elbow welding connection position is determined, and the elbow is welded with the first pipe section and the second pipe section.

[0004] The existing technology and the above patents use the on-site manual measurement method to measure the telescopic length of the center rod, which has low measurement accuracy. The variable-diameter telescopic rod of the measuring device is adjusted separately, which is cumbersome to operate and difficult to control the telescopic size accuracy, resulting in errors in the position and size of the weld joints of the prefabricated elbow assembly. The elbow connection and welding are difficult and require grinding to be successfully assembled, resulting in high labor intensity for on-site construction personnel, low construction efficiency, and affecting the construction quality. Therefore, a technical method and a digital display special measuring device that can solve the above defects are urgently needed. Summary of the invention

[0005] The invention provides a measuring device for determining the welding position of an elbow, which is used to solve the problem that the telescopic length of a measuring center rod of the existing special measuring device for determining the welding position of an elbow is measured manually on site and the measuring accuracy is low.

[0006] The present invention provides a measuring device for determining the welding position of an elbow, comprising:

[0007] A guide frame member, comprising a conduit, wherein n branch pipe assemblies are arranged at intervals on the outer wall of the conduit, each branch pipe assembly comprises m branch pipes located in the same plane, one end of each branch pipe is vertically connected to the conduit, n is an integer not less than 2, and m is an integer not less than 3;

[0008] n variable-diameter telescopic rod assemblies, each of which includes m rods, and the m rods are respectively installed in m branch pipes of a branch pipe assembly; one end of the rod is arranged in the branch pipe, and the other end extends to the outside of the branch pipe, and the rod can move along the axial direction of the branch pipe;

[0009] A measuring center rod, one end of which is provided with a pointed tip, the apex of the pointed tip is located on the axis of the measuring center rod, and the center of the other end is provided with a center hole extending along the axis; the end of the measuring center rod with the center hole is inserted into the interior of one end of the catheter, and the end with the pointed tip is provided outside the catheter; the measuring center rod is coaxially arranged with the catheter and can move along the axial direction of the catheter; the center of the measuring center rod is provided with a center hole extending along the axis; and

[0010] A magnetostrictive displacement sensor is installed on the other end of the catheter, and is used to detect the displacement of the measuring center rod in the axial direction of the catheter; the magnetostrictive displacement sensor is connected to a display device and displays the numerical value of the displacement of the measuring center rod in the axial direction of the catheter through the display device.

[0011] In one embodiment, the magnetostrictive displacement sensor includes a displacement sensor measuring rod and a position magnetic ring, wherein the position magnetic ring is fixedly mounted on the inner wall of the measuring center rod, one end of the displacement sensor measuring rod is fixedly mounted on the catheter, and the other end passes through the position magnetic ring and extends into the center hole; when the measuring center rod moves axially along the catheter, it drives the position magnetic ring to move axially along the displacement sensor measuring rod.

[0012] In one embodiment, magnetic isolation pads are respectively provided on both sides of the position magnetic ring, an annular groove is opened on the inner wall of the center hole, and the position magnetic ring and the magnetic isolation pad are fixedly installed in the annular groove through a retaining ring through the hole.

[0013] In one embodiment, the variable diameter telescopic rod assembly also includes a connecting rod seat and m connecting rods; one end of the m connecting rods is hinged to the m rod members respectively, and the other end is hinged to the connecting rod seat; the connecting rod seat is a cylindrical structure, which is sleeved on the outer wall of the conduit; the connecting rod seat can slide along the axial direction of the conduit, thereby driving the rod member to move along the axial direction of the branch pipe, and the connecting rod seat and the conduit can be fixed by fasteners.

[0014] In one embodiment, a scale is provided along the axial direction of the rod at one end of the rod extending out of the branch pipe.

[0015] The present invention also provides another measuring device for determining the welding position of an elbow, which is used to solve the problem that the adjustment operation of the variable-diameter telescopic rod of the existing special measuring device for determining the welding position of an elbow is complicated.

[0016] The present invention provides a measuring device for determining the welding position of an elbow, comprising:

[0017] A guide frame member, comprising a conduit, wherein n branch pipe assemblies are arranged at intervals on the outer wall of the conduit, each branch pipe assembly comprises m branch pipes located in the same plane, one end of each branch pipe is vertically connected to the conduit, n is an integer not less than 2, and m is an integer not less than 3;

[0018] n variable-diameter telescopic rod assemblies, each of which comprises m rods, a connecting rod seat and m connecting rods; the m rods are respectively slidably installed in m branch pipes of a branch pipe assembly, one end of the rod is arranged in the branch pipe, and the other end extends to the outside of the branch pipe; one end of the m connecting rods is respectively hinged to the m rods, and the other end is hinged to the connecting rod seat; the connecting rod seat is a cylindrical structure, which is sleeved on the outer wall of the conduit; the connecting rod seat can slide along the axial direction of the conduit, thereby driving the rod to move along the axial direction of the branch pipe, and the connecting rod seat and the conduit can be fixed by a fastener; and

[0019] A measuring center rod, one end of which is installed inside one end of the catheter and the other end extends to the outside of the catheter; the end of the measuring center rod extending to the outside of the catheter is provided with a pointed tip, and the apex of the pointed tip is located on the axis of the measuring center rod; the measuring center rod is coaxially arranged with the catheter and can move along the axial direction of the catheter.

[0020] In one embodiment, a scale is provided along the axial direction of the rod at one end of the rod extending out of the branch pipe.

[0021] In one embodiment, the center of one end of the measuring center rod located in the catheter is provided with a center hole extending along the axis; the measuring device also includes a magnetostrictive displacement sensor, which is installed on the other end of the catheter, and the magnetostrictive displacement sensor is used to detect the displacement of the measuring center rod in the axial direction of the catheter; the magnetostrictive displacement sensor is connected to a display device and displays the numerical value of the displacement of the measuring center rod in the axial direction of the catheter through the display device.

[0022] In one embodiment, the magnetostrictive displacement sensor includes a displacement sensor measuring rod and a position magnetic ring, wherein the position magnetic ring is fixedly mounted on the inner wall of the measuring center rod, one end of the displacement sensor measuring rod is fixedly mounted on the catheter, and the other end passes through the position magnetic ring and extends into the center hole; when the measuring center rod moves axially along the catheter, it drives the position magnetic ring to move axially along the displacement sensor measuring rod.

[0023] In one embodiment, an annular groove is provided on the inner wall of the center hole, and the position magnetic ring is fixedly installed in the annular groove through the hole by a retaining ring; and magnetic isolation pads are respectively provided on both sides of the position magnetic ring.

[0024] Compared with the prior art, the advantage of the present invention is that the measuring device for determining the welding position of the elbow adopts a non-contact magnetostrictive displacement sensor to improve the measurement accuracy, reduce the workload of the on-site operators, and solve the problem that the telescopic length of the measuring center rod of the existing special measuring device for determining the welding position of the elbow is measured manually on-site, and the measurement accuracy is not high. The magnetostrictive displacement sensor is simple to install, easy to operate, stable and reliable. The variable diameter telescopic rod assembly adopts a structure in which the connecting rod seat and the connecting rod are pushed synchronously. Moving the connecting rod seat can make each group of variable diameter telescopic rods extend and retract at the same time, ensuring that the telescopic dimensions of each variable diameter telescopic rod are consistent and easy to operate. It solves the technical problems that the variable diameter telescopic rods in the existing special measuring device for determining the welding position of the elbow are adjusted separately, the operation is cumbersome, the telescopic dimension accuracy is difficult to control, and the prefabricated elbow group has errors in the weld position dimensions. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Hereinafter, the present invention will be described in more detail based on embodiments and with reference to the accompanying drawings.

[0026] Figure 1 It is a schematic diagram of the application state of a measuring device for determining the welding position of an elbow in one embodiment of the present invention;

[0027] Figure 2 for Figure 1 A cross-sectional view at AA;

[0028] Figure 3 for Figure 1 A cross-sectional view at BB;

[0029] Figure 4 for Figure 3 The enlarged view of point I in the middle;

[0030] Figure 5 It is a schematic diagram of the application state of a measuring device for determining the welding position of an elbow in another embodiment of the present invention;

[0031] Figure 6 for Figure 5 A cross-sectional view at AA;

[0032] Figure 7 for Figure 6 Cross-sectional view at BB.

[0033] Reference numerals:

[0034] 1. The first straight pipe section to be welded; 2. The first measuring device; 3. The fastening screws; 4. The second straight pipe section to be welded; 5. The second measuring device; 6. The guide frame member; 7. The locking nut 21; 8. The rod member; 9. The magnetostrictive displacement sensor; 10. The displacement sensor measuring rod; 11. The measuring center rod; 12. The magnetic isolation pad; 13. The position magnetic ring; 14. The retaining ring for the hole; 15. The second pin shaft; 16. The first pin shaft; 17. The retaining ring for the shaft; 18. The connecting rod; 19. The connecting rod seat; 20. The fixing bolt; 22. The locking nut; 23. The guide tube; 24. The branch pipe. DETAILED DESCRIPTION

[0035] The present invention will be further described below in conjunction with the accompanying drawings.

[0036] Embodiment 1

[0037] like Figures 1 to 4 As shown, the present invention provides a measuring device for determining the welding position of an elbow (hereinafter referred to as the measuring device), which is mainly composed of a guide frame component 6, a variable diameter telescopic rod assembly, a measuring center rod 11 and a magnetostrictive displacement sensor 9.

[0038] The guide frame member 6 includes a conduit 23 and at least two groups of branch pipe assemblies. The measuring center rod 11 and the magnetostrictive displacement sensor 9 are respectively installed at both ends of the conduit 23. At least two branch pipe assemblies are installed on the outer wall of the conduit 23 at intervals. Each branch pipe assembly is composed of at least three branch pipes 24 located in the same plane, and one end of each branch pipe 24 is vertically connected to the conduit 23.

[0039] The variable diameter telescopic rod assembly is used in conjunction with the branch pipe assembly, so the number of variable diameter telescopic rod assemblies is consistent with the number of branch pipe assemblies; each variable diameter telescopic rod assembly includes a plurality of rods 8, one end of the rod 8 is arranged in the branch pipe 24, and the other end extends to the outside of the branch pipe 24, and the rod 8 can move along the axial direction of the branch pipe 24; these rods 8 cooperate with the branch pipe 24, so the number of rods 8 in each variable diameter telescopic rod assembly is consistent with the number of branch pipes 24 in the corresponding branch pipe assembly. For example, in Figures 1 to 4 In the measuring device shown, two branch pipe assemblies are arranged at intervals on the outer wall of the catheter 23, and each branch pipe assembly is composed of three branch pipes 24 located in the same plane. Preferably, the three branch pipes 24 are evenly distributed in the circumference of the catheter 23. Two variable diameter telescopic rod assemblies are provided, and each variable diameter telescopic rod assembly includes three rods 8, and the three rods 8 are respectively installed in the three branch pipes 24 of the same branch pipe assembly. One end of the rod 8 is inserted in the branch pipe 24, and the rod 8 can move along the axial direction of the branch pipe 24; the other end of the rod extends to the outside of the branch pipe 24, which is used to contact the inner wall of the pipe to be welded. The position of the rod 8 on the branch pipe 24 can be fixed by a locking nut 7. In some embodiments, a scale ruler is provided along the axial direction of the rod 8 at one end of the rod 8 extending out of the branch pipe 24, and the radial size of the measuring device can be intuitively displayed by the scale ruler.

[0040] One end of the measuring center rod 11 is provided with a pointed tip, and the apex of the pointed tip is located on the axis of the measuring center rod 11; a center hole extending along the axis is opened at the center position of the other end of the measuring center rod 11. The end of the measuring center rod 11 with the center hole is inserted into the catheter 23, and the end with the pointed tip is arranged outside the catheter 23. The measuring center rod 11 is coaxially arranged with the catheter 23 and can move along the axial direction of the catheter 23. The catheter 23 is provided with a fastening screw 3, and the position of the measuring center rod 11 on the catheter 23 can be fixed by the fastening screw 3, thereby fixing the length of the measuring center rod 11 extending outside the catheter 23.

[0041] The magnetostrictive displacement sensor 9 can be installed at one end of the catheter 23 away from the measuring center rod 11 through a thread, and the magnetostrictive displacement sensor 9 is used to detect the displacement of the measuring center rod 11 in the axial direction of the catheter 23. The magnetostrictive displacement sensor 9 is connected to the display device through a cable, and the value of the displacement of the measuring center rod 11 in the axial direction of the catheter 23 is displayed through the display device. In some embodiments, such as Figure 4As shown, the magnetostrictive displacement sensor 9 includes a displacement sensor measuring rod 10 and a position magnetic ring 13. An annular groove is provided on the inner wall of the center hole of the measuring center rod 11. A magnetic isolation pad 12 is provided on both sides of the position magnetic ring 13. The position magnetic ring 13 and the two magnetic isolation pads 12 are fixedly installed in the annular groove through a retaining ring 14 through a hole. One end of the displacement sensor measuring rod 10 is fixedly connected to the catheter 23, and the other end passes through the position magnetic ring 13 and extends into the center hole. When the measuring center rod 11 moves axially along the catheter 23, the position magnetic ring 13 will be driven to move axially along the displacement sensor measuring rod 10, and a real-time displacement output signal will be generated and transmitted to the display through a cable, so as to realize the accurate measurement digital display of the measuring device.

[0042] Two measuring devices are required for welding. The two measuring devices are respectively installed in the pipes of the two straight pipe sections to be welded at both ends of the same elbow. One is the first measuring device 2 installed in the first straight pipe section 1 to be welded, and the other is the second measuring device 5 installed in the second straight pipe section 4 to be welded. Before using the two measuring devices, first adjust the telescopic amount of the rods 8 in the two variable diameter telescopic rod assemblies installed on the guide frame member 6 according to the diameter of the two straight pipe sections to be welded, adjust the telescopic amount of each rod 8, make the radial size of the measuring device the same as the inner diameter of the corresponding straight pipe section to be welded, and then fix the rod 8 with the locking nut 7.

[0043] Adjust the actual extension length L of the measuring center rod 11 so that the L value (L=om=on, point o is the vertex of the measuring center rod 11, point m is the end point of the guide frame member 6 of the first measuring device 2, and point n is the end point of the guide frame member 6 of the second measuring device 5) is equal to the theoretically calculated extension length value (theoretical calculation of L value: L=R*Sinα / 2, where R is the elbow bending radius and α is the elbow bending angle). After the actual extension length L value is determined, tighten the measuring center rod 11 with the tightening screw 3.

[0044] The first measuring device 2 is placed in the first straight pipe section 1 to be welded, so that the end point m of the guide frame member 6 of the first measuring device 2 is flush with the pipe opening of the first straight pipe section 1 to be welded.

[0045] Place the second measuring device 5 into the second straight pipe section to be welded 4, so that the vertex of the center rod 11 measured by the second measuring device 5 intersects with the vertex of the center rod 11 measured by the first measuring device 2 at point o. If they cannot intersect at point o, adjust the positions of the two straight pipe sections to be welded and make the vertices of the two measuring devices intersect at point o to ensure that the axis lines of the first straight pipe section to be welded 1 and the second straight pipe section to be welded 4 are in the same plane.

[0046] Measure the L1 value on the second straight pipe section 4 to be welded (the L1 value is the length from the pipe mouth of the second straight pipe section 4 to be welded to the end point n of the guide frame member 6 of the second measuring device 5). After the L1 value is determined, mark the cutting position on the second straight pipe section 4 to be welded, cut the L1 pipe section, determine the elbow welding connection position, and perform the elbow connection welding.

[0047] Embodiment 2

[0048] like Figures 5 to 7 As shown, the present invention provides a measuring device for determining the welding position of an elbow (hereinafter referred to as the measuring device), which is mainly composed of a guide frame component 6, a variable diameter telescopic rod assembly, a measuring center rod 11 and a magnetostrictive displacement sensor 9.

[0049] The guide frame member 6 includes a conduit 23 and at least two groups of branch pipe assemblies. The measuring center rod 11 and the magnetostrictive displacement sensor 9 are respectively installed at both ends of the conduit 23. At least two branch pipe assemblies are installed on the outer wall of the conduit 23 at intervals. Each branch pipe assembly is composed of at least three branch pipes 24 located in the same plane, and one end of each branch pipe 24 is vertically connected to the conduit 23.

[0050] The variable diameter telescopic rod assembly is used in conjunction with the branch pipe assembly, so the number of variable diameter telescopic rod assemblies is consistent with the number of branch pipe assemblies. Each variable diameter telescopic rod assembly includes a plurality of rods 8, a plurality of connecting rods 18 and a connecting rod seat 19. The rods 8 in each variable diameter telescopic rod assembly are matched one by one with the corresponding branch pipes 24 in the corresponding branch pipe assembly, so the number of rods 8 in a single variable diameter telescopic rod assembly is consistent with the number of branch pipes 24 in the corresponding branch pipe assembly; the connecting rod 18 is used to connect the corresponding rod 8 to the base, and the number of connecting rods 18 is consistent with the number of rods 8; for example, in Figures 5 to 7 In the measuring device shown, two branch pipe assemblies are arranged at intervals on the outer wall of the catheter 23, each branch pipe assembly is composed of four branch pipes 24 located in the same plane, and preferably the four branch pipes 24 are evenly distributed in the circumference of the catheter 23. Two variable diameter telescopic rod assemblies are provided, each variable diameter telescopic rod assembly includes four rods 8 and four connecting rods 18, the four rods 8 are respectively installed in the four branch pipes 24 of the same branch pipe assembly, and the four rods 8 are respectively connected to the connecting rod seats 19 through the four connecting rods 18.

[0051] One end of the rod 8 is slidably installed in the corresponding branch pipe 24, and the end of the rod 8 is connected to one end of the connecting rod 18 through the first pin shaft 16, and the other end of the connecting rod 18 is connected to the connecting rod seat 19 through the second pin shaft 15, and is fixed by the shaft retaining ring 17; the other end of the rod 8 extends to the outside of the branch pipe 24, and is used to contact the inner wall of the pipe to be welded. The connecting rod seat 19 is a cylindrical structure, which is sleeved on the outer wall of the conduit 23. The connecting rod seat 19 is provided with a fixing bolt 20 and a locking nut 21. The connecting rod seat 19 and the conduit 23 can be fastened by the fixing bolt 20 and locked by the locking nut 21. The connecting rod seat 19 can slide along the axial direction of the conduit 23, thereby driving the rod 8 to move along the axial direction of the branch pipe 24, so that the rod 8 of each group of variable diameter telescopic rod assembly can be extended and retracted at the same time, so as to realize the rapid adjustment of the radial size of the measuring device. In some embodiments, a scale is provided along the axial direction of the rod 8 at one end of the rod 8 extending out of the branch pipe 24, and the radial dimension of the measuring device can be intuitively displayed through the scale.

[0052] One end of the measuring center rod 11 is provided with a pointed tip, and the apex of the pointed tip is located on the axis of the measuring center rod 11; a center hole extending along the axis is provided at the center position of the other end of the measuring center rod 11. The end of the measuring center rod 11 with the center hole is inserted into the catheter 23, and the end with the pointed tip is provided outside the catheter 23. The measuring center rod 11 is provided coaxially with the catheter 23 and can move along the axial direction of the catheter 23. The catheter 23 is provided with a locking nut 22, and the position of the measuring center rod 11 on the catheter 23 can be fixed by the locking nut 22, thereby fixing the length of the measuring center rod 11 extending outside the catheter 23.

[0053] The magnetostrictive displacement sensor 9 can be installed at one end of the catheter 23 away from the measuring center rod 11 through a thread, and the magnetostrictive displacement sensor 9 is used to detect the displacement of the measuring center rod 11 in the axial direction of the catheter 23. The magnetostrictive displacement sensor 9 is connected to the display device through a cable, and the value of the displacement of the measuring center rod 11 in the axial direction of the catheter 23 is displayed through the display device. In some embodiments, such as Figure 4 As shown, the magnetostrictive displacement sensor 9 includes a displacement sensor measuring rod 10 and a position magnetic ring 13. An annular groove is provided on the inner wall of the center hole of the measuring center rod 11. A magnetic isolation pad 12 is provided on both sides of the position magnetic ring 13. The position magnetic ring 13 and the two magnetic isolation pads 12 are fixedly installed in the annular groove through a hole retaining ring 14. One end of the displacement sensor measuring rod 10 is fixedly connected to the catheter 23, and the other end passes through the position magnetic ring 13 and extends into the center hole. When the measuring center rod 11 moves axially along the catheter 23, it will drive the position magnetic ring 13 to move axially along the displacement sensor measuring rod 10, generate a real-time displacement output signal, and transmit it to the display through the cable, so as to realize the accurate measurement digital display of the measuring device.

[0054] Two measuring devices are required for welding, and the two measuring devices are respectively installed in the pipes of the two straight pipe sections to be welded at both ends of the same elbow, one is the first measuring device 2 installed in the first straight pipe section 1 to be welded, and the other is the second measuring device 5 installed in the second straight pipe section 4 to be welded. Before using the two measuring devices, firstly adjust the telescopic amount of the rods 8 in the two variable diameter telescopic rod assemblies installed on the guide frame member 6 according to the diameter of the two straight pipe sections to be welded, and move the connecting rod seat 19 along the axial direction of the guide tube 23 to adjust the telescopic amount of the four rods 8 at the same time, so that the radial size of the measuring device is the same as the inner diameter of the corresponding straight pipe section to be welded, and then the connecting rod seat 19 is fastened by the fixing bolt 20 and the locking nut 21 is locked.

[0055] Adjust the actual extension length L of the measuring center rod 11 so that the L value (L=om=on, point o is the top of the measuring center rod 11, point m is the end point of the guide frame member 6 of the first measuring device 2, and point n is the end point of the guide frame member 6 of the second measuring device 5) is equal to the theoretically calculated extension length value (theoretical calculation of L value: L=R*Sinα / 2, where R is the elbow bending radius and α is the elbow bending angle). After the actual extension length L value is determined, use the locking nut 22 to lock the measuring center rod 11.

[0056] The first measuring device 2 is placed in the first straight pipe section 1 to be welded, so that the end point m of the guide frame member 6 of the first measuring device 2 is flush with the pipe opening of the first straight pipe section 1 to be welded.

[0057] Place the second measuring device 5 into the second straight pipe section to be welded 4, so that the vertex of the center rod 11 measured by the second measuring device 5 intersects with the vertex of the center rod 11 measured by the first measuring device 2 at point o. If they cannot intersect at point o, adjust the positions of the two straight pipe sections to be welded and make the vertices of the two measuring devices intersect at point o to ensure that the axis lines of the first straight pipe section to be welded 1 and the second straight pipe section to be welded 4 are in the same plane.

[0058] Measure the L1 value on the second straight pipe section 4 to be welded (the L1 value is the length from the pipe mouth of the second straight pipe section 4 to be welded to the end point n of the guide frame member 6 of the second measuring device 5). After the L1 value is determined, mark the cutting position on the second straight pipe section 4 to be welded, cut the L1 pipe section, determine the elbow welding connection position, and perform the elbow connection welding.

[0059] Although the present invention has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced by equivalents without departing from the scope of the present invention. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A measuring device for determining the welding position of an elbow, characterized in that: include: A guide frame member, comprising a conduit, wherein n branch pipe assemblies are arranged at intervals on the outer wall of the conduit, each branch pipe assembly comprises m branch pipes located in the same plane, one end of each branch pipe is vertically connected to the conduit, n is an integer not less than 2, and m is an integer not less than 3; n variable-diameter telescopic rod assemblies, each of which includes m rods, and the m rods are respectively installed in m branch pipes of a branch pipe assembly; one end of the rod is arranged in the branch pipe, and the other end extends to the outside of the branch pipe, and the rod can move along the axial direction of the branch pipe; A measuring center rod, one end of which is provided with a pointed tip, the apex of the pointed tip is located on the axis of the measuring center rod, and the center of the other end is provided with a center hole extending along the axis; the end of the measuring center rod with the center hole is inserted into the interior of one end of the catheter, and the end with the pointed tip is provided outside the catheter; the measuring center rod is coaxially arranged with the catheter and can move along the axial direction of the catheter; the center of the measuring center rod is provided with a center hole extending along the axis; and A magnetostrictive displacement sensor is installed on the other end of the catheter, and is used to detect the displacement of the measuring center rod in the axial direction of the catheter; the magnetostrictive displacement sensor is connected to a display device and displays the numerical value of the displacement of the measuring center rod in the axial direction of the catheter through the display device.

2. The measuring device for determining the elbow welding position according to claim 1, characterized in that: The magnetostrictive displacement sensor comprises a displacement sensor measuring rod and a position magnetic ring, wherein the position magnetic ring is fixedly mounted on the inner wall of the measuring center rod, one end of the displacement sensor measuring rod is fixedly mounted on the catheter, and the other end passes through the position magnetic ring and extends into the center hole; when the measuring center rod moves axially along the catheter, the position magnetic ring is driven to move axially along the displacement sensor measuring rod.

3. The measuring device for determining the elbow welding position according to claim 2, characterized in that: Magnetic isolation pads are respectively arranged on both sides of the position magnetic ring, an annular groove is opened on the inner wall of the central hole, and the position magnetic ring and the magnetic isolation pad are fixedly installed in the annular groove through the hole by a retaining ring.

4. The measuring device for determining the elbow welding position according to claim 3 is characterized in that: The variable diameter telescopic rod assembly also includes a connecting rod seat and m connecting rods; one end of the m connecting rods is hinged to the m rod members respectively, and the other end is hinged to the connecting rod seat; the connecting rod seat is a cylindrical structure, which is sleeved on the outer wall of the conduit; the connecting rod seat can slide along the axial direction of the conduit, thereby driving the rod member to move along the axial direction of the branch pipe, and the connecting rod seat and the conduit can be fixed by fasteners.

5. The measuring device for determining the elbow welding position according to claim 3, characterized in that: One end of the rod extending out of the branch pipe is provided with a scale along the axial direction of the rod.

6. A measuring device for determining the welding position of an elbow, characterized in that: include: A guide frame member, comprising a conduit, wherein n branch pipe assemblies are arranged at intervals on the outer wall of the conduit, each branch pipe assembly comprises m branch pipes located in the same plane, one end of each branch pipe is vertically connected to the conduit, n is an integer not less than 2, and m is an integer not less than 3; n variable-diameter telescopic rod assemblies, each of which comprises m rods, a connecting rod seat and m connecting rods; the m rods are respectively slidably installed in m branch pipes of a branch pipe assembly, one end of the rod is arranged in the branch pipe, and the other end extends to the outside of the branch pipe; one end of the m connecting rods is respectively hinged to the m rods, and the other end is hinged to the connecting rod seat; the connecting rod seat is a cylindrical structure, which is sleeved on the outer wall of the conduit; the connecting rod seat can slide along the axial direction of the conduit, thereby driving the rod to move along the axial direction of the branch pipe, and the connecting rod seat and the conduit can be fixed by a fastener; and A measuring center rod, one end of which is installed inside one end of the catheter and the other end extends to the outside of the catheter; the end of the measuring center rod extending to the outside of the catheter is provided with a pointed tip, and the apex of the pointed tip is located on the axis of the measuring center rod; the measuring center rod is coaxially arranged with the catheter and can move along the axial direction of the catheter.

7. The measuring device for determining the elbow welding position according to claim 6, characterized in that: One end of the rod extending out of the branch pipe is provided with a scale along the axial direction of the rod.

8. The measuring device for determining the elbow welding position according to claim 6, characterized in that: The center of one end of the measuring center rod located in the catheter is provided with a center hole extending along the axis; the measuring device also includes a magnetostrictive displacement sensor, which is installed on the other end of the catheter and is used to detect the displacement of the measuring center rod in the axial direction of the catheter; the magnetostrictive displacement sensor is connected to a display device and displays the numerical value of the displacement of the measuring center rod in the axial direction of the catheter through the display device.

9. The measuring device for determining the elbow welding position according to claim 8, characterized in that: The magnetostrictive displacement sensor comprises a displacement sensor measuring rod and a position magnetic ring, wherein the position magnetic ring is fixedly mounted on the inner wall of the measuring center rod, one end of the displacement sensor measuring rod is fixedly mounted on the catheter, and the other end passes through the position magnetic ring and extends into the center hole; when the measuring center rod moves axially along the catheter, the position magnetic ring is driven to move axially along the displacement sensor measuring rod.

10. The measuring device for determining the elbow welding position according to claim 9, characterized in that: An annular groove is provided on the inner wall of the center hole, and the position magnetic ring is fixedly installed in the annular groove through the hole by a retaining ring; magnetic isolation pads are respectively provided on both sides of the position magnetic ring.

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