Welding and positioning tool for U-shaped lifting lug of process pipeline and using method of welding and positioning tool

Abstract

The invention belongs to the technical field of engineering installation, and particularly relates to a process pipeline U-shaped lifting lug welding and positioning tool and a using method. The device comprises a convex ring positioning base, a lifting lug positioning base, a branch pipe flange positioning base and arc-shaped supports, one side of the convex ring positioning base is fixedly connected with the branch pipe flange positioning base, the arc-shaped supports are arranged on the upper end face of the convex ring positioning base, and the lifting lug positioning base is of a circular ring structure and is fixedly installed at the upper ends of the arc-shaped supports. The method has the advantages that the positioning precision is high, the welding positioning steps are simplified, and the working efficiency is improved, and the problems that in the prior art, the number of operators is large, efficiency and precision are low, and the reject ratio is high can be solved.

Description

Technical Field

[0001] This invention belongs to the field of engineering installation technology, specifically relating to a welding and positioning fixture for a process pipeline U-shaped lifting lug and its usage method. Background Technology

[0002] In engineering construction, process piping in specialized equipment is composed of various piping components connected or assembled, such as pipes, fittings, flanges, gaskets, fasteners, valves and expansion joints, pressure hoses, steam traps, filters, and separator flanges. The welding and positioning of the φ108 main pipe, U-shaped lifting lugs, and branch flanges in the process piping risers must strictly comply with the requirements of the "Construction and Acceptance Specifications for Process Gas Piping Engineering in Uranium Enrichment Plants," etc.

[0003] In existing technology, the welding of the φ108 main pipe, U-shaped lifting lugs, and branch flanges in the process piping risers of special equipment requires the cooperation of one welder and one to two assistants, and involves multiple manual positioning processes such as measurement, marking, and correction. The tee branch pipe is spot-welded to the horseshoe hole of the φ108 main pipe. Then, the length deviation, verticality, and parallelism between the flange end face and the main pipe are measured. After passing the tests, the branch pipe is fully welded with argon arc welding. Then, three U-shaped lifting lugs are spot-welded to the positioning lines drawn on the outer wall of the φ108 main pipe, ensuring that the three lifting lugs are 120° apart. The verticality, angle, and parallelism between the lifting lugs and the convex ring on the end face of the φ108 main pipe are checked again to ensure they are up to standard. If they are not up to standard, the weld seam must be cut, beveled, and ground, and then re-welded at most once. Otherwise, the pipe must be scrapped.

[0004] Existing technologies have many shortcomings in practical operation, such as:

[0005] (1) The original welding positioning accuracy was low, with an average qualification rate of only 78%.

[0006] (2) It requires one welder and one or two assistants to work together and use a variety of measuring instruments to repeatedly measure and correct manually. The operation involves many steps and takes about 30 minutes per piece, requiring a lot of manpower and resources.

[0007] (3) If the weld is not up to standard after welding, the weld seam needs to be cut, beveled and ground. It can be re-welded at most once. Otherwise, it will affect the welding quality requirements of the main process pipeline and the construction progress of the special equipment project.

[0008] The measurement and positioning process involves numerous steps, resulting in large cumulative errors, and the lack of dedicated positioning and welding fixtures. This leads to drawbacks such as a large number of workers, low efficiency, low accuracy, and a high rate of defective products. Summary of the Invention

[0009] The technical problem solved by this invention is to provide a welding and positioning fixture for U-shaped lifting lugs of process pipelines and a method for using it. It has the advantages of high positioning accuracy, simplified welding and positioning steps, and improved work efficiency, and can solve the problems of large number of operators, low efficiency, low accuracy, and high defect rate in the existing technology.

[0010] The technical solution adopted in this invention is as follows:

[0011] A welding and positioning fixture for a U-shaped lifting lug of a process pipeline includes a convex ring positioning base, a lifting lug positioning seat, a branch flange positioning seat, and an arc-shaped support. One side of the convex ring positioning base is fixedly connected to the branch flange positioning seat. The upper surface of the convex ring positioning base is provided with multiple arc-shaped supports. The lifting lug positioning seat is a circular ring structure and is fixedly installed on the upper end of the arc-shaped support.

[0012] The convex ring positioning base and the branch flange positioning base are welded together at a 90° angle.

[0013] The branch flange positioning seat has multiple positioning holes, and the branch flange positioning pins are installed in the positioning holes.

[0014] The branch flange positioning pin is fitted with the positioning hole with a clearance fit.

[0015] A convex ring positioning groove is opened at the center of the upper end face of the convex ring positioning base.

[0016] The center of the lifting lug positioning seat has a guide cavity.

[0017] Multiple lifting lug positioning grooves are evenly distributed on one side of the inner wall of the upper end face of the lifting lug positioning seat.

[0018] The lifting lug positioning groove is equipped with a lifting lug positioning platform.

[0019] All components are made of carbon steel, and the fixed connections are welded using argon arc welding.

[0020] A method for using a welding and positioning fixture for a process pipeline U-shaped lifting lug includes the following steps:

[0021] Step 1: Place the φ108 main pipe, with the lower convex ring closest to the horseshoe hole, vertically along the guide cavity into the convex ring positioning groove on the convex ring positioning base;

[0022] Step 2: Place the three U-shaped lugs into the lug positioning slots of the lug positioning seat;

[0023] Step 3: Position the welded branch flange and branch pipe together on the branch flange positioning seat using the four branch flange positioning pins. All the branch flange positioning pins need to be inserted into the four positioning holes of the branch flange positioning seat.

[0024] Step 4: After spot welding and positioning the three U-shaped lifting lugs and branch pipes to the φ108 main pipe, the base layer is then applied.

[0025] Step 5: Take out the φ108 main pipe, U-shaped lifting lug, branch pipe, and branch pipe flange that have been spot-welded and positioned, perform full argon arc welding, and then check the dimensional accuracy.

[0026] The beneficial effects of this invention are:

[0027] (1) The present invention provides a welding and positioning fixture and method for U-shaped lifting lugs in process pipelines. The welding and positioning of φ108 main pipe, U-shaped lifting lugs, branch pipes and branch pipe flanges in process pipelines only requires one welder, saving 1 to 2 auxiliary personnel compared with the previous welding and positioning methods. It saves the investment of personnel and equipment, and allows the construction personnel to be invested in other work areas of the project construction to the maximum extent.

[0028] (2) The present invention provides a welding positioning fixture and method for U-shaped lifting lugs of process pipelines, which eliminates the process of repeated measurement, drawing and correction. The welding positioning time of φ108 main pipe, U-shaped lifting lug, branch pipe and branch flange in each process pipeline vertical pipe is about 12 minutes, which saves 18 minutes compared with the previous welding positioning method.

[0029] (3) The present invention provides a welding positioning fixture and method for U-shaped lifting lugs in process pipelines, which improves the accuracy and pass rate of welding positioning of φ108 main pipe, U-shaped lifting lugs, branch pipes and branch pipe flanges in process pipelines, with a pass rate of more than 99%. It can reduce the steps of cutting the weld, beveling, grinding and re-welding after full welding of process pipelines due to large errors in welding positioning dimensions, and only allows re-welding once, otherwise scrapping is required, thus reducing the waste of resources. Attached Figure Description

[0030] To more clearly illustrate the embodiments of the present invention, the accompanying drawings used in describing the embodiments of the present invention will be briefly described below. Obviously, the drawings described below are merely some embodiments recorded in the present invention. Those skilled in the art can derive other drawings from the following drawings without any creative effort.

[0031] Figure 1 A schematic diagram showing the usage status of the welding and positioning fixture for the process pipeline U-shaped lifting lugs provided by the present invention;

[0032] Figure 2 A schematic diagram of the overall structure of the welding and positioning fixture for the process pipeline U-shaped lifting lugs provided by the present invention;

[0033] Figure 3 for Figure 2 The main view;

[0034] Figure 4 The present invention provides Figure 3 Top view;

[0035] Figure 5 The present invention provides Figure 2 A three-dimensional sectional view;

[0036] Figure 6 The present invention provides Figure 3 The left view;

[0037] Figure 7 The present invention provides Figure 3 The right view;

[0038] In the diagram, 1: convex ring positioning base; 2: lifting lug positioning seat; 3: branch flange positioning seat; 4: arc-shaped support; 5: lifting lug positioning groove; 6: lifting lug positioning platform; 7: branch flange positioning pin; 8: convex ring positioning groove; 9: guide cavity; 10: central φ108 main pipe; 11: branch flange; 12: U-shaped lifting lug; 13: upper convex ring; 14: lower convex ring; 15: branch pipe. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present invention.

[0040] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., refer to the orientation or positional relationship shown in the accompanying drawings, and are used only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0041] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or a connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0042] like Figure 1-7 As shown, the present invention provides a welding and positioning fixture for a U-shaped lifting lug of a process pipeline, comprising a convex ring positioning base 1, a lifting lug positioning seat 2, a branch flange positioning seat 3, and an arc-shaped support 4. One side of the convex ring positioning base 1 is fixedly connected to the branch flange positioning seat 3, and the convex ring positioning base 1 and the branch flange positioning seat 3 are welded together at a 90° angle. The branch flange positioning seat 3 has multiple positioning holes, and branch flange positioning pins 7 are installed in the positioning holes, with a clearance fit between the pins and the holes. A convex ring positioning groove 8 is formed at the center of the upper surface of the convex ring positioning base 1, and multiple arc-shaped supports 4 are arranged around the groove. The lifting lug positioning seat 2 has a circular ring structure with a guide cavity 9 in the center, and is fixedly installed on the upper end of the arc-shaped support 4. Multiple lifting lug positioning grooves 5 are evenly formed on one side of the inner wall of the upper surface of the lifting lug positioning seat 2, and a lifting lug positioning platform 6 is provided inside the groove.

[0043] When welding and positioning the φ108 main pipe 10, U-shaped lifting lug 12, branch pipe 15, and branch pipe flange 11 in the process piping of special equipment,

[0044] The lower convex ring 14 of the central φ108 main pipe 10 is passed through the guide cavity 9 and inserted into the convex ring positioning groove 8. The three U-shaped lifting lugs 12 on the outer side of the central φ108 main pipe 10 fall into the lifting lug positioning groove 5 and are limited by the lifting lug positioning platform 6. The side wall of the central φ108 main pipe 10 is connected to the branch pipe 15 through the branch pipe flange 11. The branch pipe 15 is fixedly connected to the branch pipe flange positioning seat 3 through the branch pipe flange positioning pin 7, spot welded for positioning, and then removed for full welding. The above operation can be completed by one welder without the need for auxiliary personnel.

[0045] The U-shaped lifting lug welding and positioning fixture for process pipelines provided by this invention uses carbon steel for all components and argon arc welding for the fixed connection.

[0046] The present invention provides a method for using a welding and positioning fixture for a process pipeline U-shaped lifting lug, comprising the following steps:

[0047] Step 1: First, place the φ108 main pipe 10, with the lower convex ring 14 on the side closest to the horseshoe hole, vertically along the guide cavity 9 into the convex ring positioning groove 8 on the convex ring positioning base 1.

[0048] Step 2: Place the three U-shaped lifting lugs 12 into the lifting lug positioning slots 5 of the lifting lug positioning seat 2. If the lifting lug positioning platform 6 blocks the U-shaped lifting lugs 12 and they cannot be placed in, it means that the U-shaped lifting lugs 12 are unqualified and need to be corrected or scrapped.

[0049] Step 3: Position the pre-welded branch flange 11 and branch pipe 15 together on the branch flange positioning seat 3 using four branch flange positioning pins 7. All the branch flange positioning pins 7 need to be inserted into the four positioning holes of the branch flange positioning seat 3.

[0050] Step 4: After spot welding and positioning the three U-shaped lifting lugs 12 and the branch pipe 15 to the φ108 main pipe 10, the base layer is applied.

[0051] Step 5: Take out the φ108 main pipe 10, U-shaped lifting lug 12, branch pipe, and branch pipe flange 11 that have been spot-welded and positioned, perform full argon arc welding, and then check the dimensional accuracy.

[0052] This invention efficiently completes the assembly and processing of process pipeline vertical pipes during engineering construction. What previously required one welder and one to two assistants can now be completed by just one welder. Furthermore, the operation is simple, efficient, and highly precise, ensuring the construction progress and quality of the project.

[0053] While those skilled in the art will recognize that the present invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention, the embodiments should be considered illustrative and non-limiting in all respects. The scope of the invention is defined by the appended claims rather than the foregoing description, and therefore all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0054] Furthermore, it should be understood that although the present invention is described according to embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A welding and positioning fixture for a U-shaped lifting lug of a process pipeline, characterized in that, It includes a convex ring positioning base (1), a lifting lug positioning seat (2), a branch flange positioning seat (3), and an arc-shaped support (4). One side of the convex ring positioning base (1) is fixedly connected to the branch flange positioning seat (3). The upper surface of the convex ring positioning base (1) is provided with multiple arc-shaped supports (4). The lifting lug positioning seat (2) is a circular ring structure and is fixedly installed on the upper end of the arc-shaped support (4).

2. The welding and positioning fixture for the U-shaped lifting lug of the process pipeline according to claim 1, characterized in that, The convex ring positioning base (1) and the branch flange positioning base (3) are welded together at 90° perpendicularly.

3. The welding and positioning fixture for the U-shaped lifting lug of the process pipeline according to claim 2, characterized in that, The branch flange positioning seat (3) has multiple positioning holes, and the branch flange positioning pin (7) is installed in the positioning holes.

4. The welding and positioning fixture for the U-shaped lifting lug of the process pipeline according to claim 3, characterized in that, The branch flange positioning pin (7) is connected to the positioning hole with clearance fit.

5. The welding and positioning fixture for the U-shaped lifting lug of the process pipeline according to claim 4, characterized in that, A convex ring positioning groove (8) is opened at the center of the upper end face of the convex ring positioning base (1).

6. The welding and positioning fixture for the U-shaped lifting lug of the process pipeline according to claim 5, characterized in that, The center of the lifting lug positioning seat (2) has a guide cavity (9).

7. The welding and positioning fixture for the U-shaped lifting lug of the process pipeline according to claim 6, characterized in that, Multiple lifting lug positioning grooves (5) are evenly opened on one side of the inner wall of the upper end face of the lifting lug positioning seat (2).

8. The welding and positioning fixture for the U-shaped lifting lug of the process pipeline according to claim 7, characterized in that, The lifting lug positioning groove (5) is provided with a lifting lug positioning platform (6).

9. The welding and positioning fixture for the U-shaped lifting lug of the process pipeline according to claim 8, characterized in that, All components are made of carbon steel, and the fixed connections are welded using argon arc welding.

10. A method for using a welding and positioning fixture for a process pipeline U-shaped lifting lug, characterized in that, Includes the following steps: Step 1: Place the φ108 main tube (10) with the lower convex ring (14) on the side closest to the horseshoe hole vertically along the guide cavity (9) into the convex ring positioning groove (8) on the convex ring positioning base (1); Step 2: Place the three U-shaped lugs (12) into the lug positioning slots (5) of the lug positioning seat (2); Step 3: Position the welded branch flange (11) and branch pipe (15) together on the branch flange positioning seat (3) using 4 branch flange positioning pins (7). All the branch flange positioning pins (7) need to be inserted into the 4 positioning holes of the branch flange positioning seat (3). Step 4: The three U-shaped lifting lugs (12) and the branch pipe (15) are spot welded to the φ108 main pipe (10) for positioning and then the base is applied. Step 5: Take out the φ108 main pipe (10), U-shaped lifting lug (12), branch pipe, and branch pipe flange (11) that have been spot-welded and positioned, perform full argon arc welding, and then check the dimensional accuracy.

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