Auxiliary device for assembling and welding pipe cap and connecting pipe

Abstract

The utility model discloses an auxiliary device for assembling and welding a pipe cap and a connecting pipe, which relates to the technical field of auxiliary devices for manufacturing nuclear power and pressure vessels and comprises a butterfly nut, a positioning fixing plate, a supporting positioning rod, a pipe clamp, an adjusting bolt, an auxiliary positioning rod, a positioning tool pipe, a base, a gasket, a nut and a pipe clamp fixing device. The device is simple and reasonable in structure, can be used as an auxiliary device for assembling and welding a pipe cap and a connecting pipe, can be used for assembling and positioning the pipe cap and the connecting pipe, and can be used for clamping and fixing the connecting pipe; after the pipe cap and the connecting pipe are assembled and welded, the perpendicularity requirement of the connecting pipe center line and the horizontal plane and the overlap ratio requirement of the connecting pipe center line and the pipe cap center line can be met, and the manufacturing precision and quality are guaranteed.

Description

Technical Field

[0001] This utility model relates to the technical field of auxiliary devices for nuclear power and pressure vessel manufacturing, and in particular to an auxiliary device for welding pipe caps and pipe fittings. Background Technology

[0002] In nuclear power and pressure vessel products, the welding of pipe caps and nozzles is a common structural form, and the welded joint generally requires full penetration. The common manufacturing method is as follows: according to the dimensions in the design drawings, pipe holes are machined at corresponding positions on the pipe cap, and the nozzle is manufactured using seamless steel pipes of corresponding specifications. During subsequent assembly, the pipe holes in the pipe cap and the inner hole of the nozzle are used as assembly references. After the pipe holes in the pipe cap and the inner hole of the nozzle are aligned, the root pass welding is performed. After the root pass welding is completed, the assembly relationship between the nozzle and the pipe cap is checked to ensure it meets the dimensional and tolerance requirements of the design drawings. Once the check is passed, the weld is then fused until the weld meets the drawing requirements. Due to structural reasons, the root of the fillet weld of the welded nozzle may have defects such as incomplete penetration, incomplete fusion, and weld beads. Therefore, in applications with high welding quality requirements, to avoid these defects, the design drawings may require the nozzle to be made of forgings. The outer surface of the nozzle is machined from the forging blank first, and the pipe holes in the pipe cap and the inner hole of the nozzle are machined together after the pipe cap and nozzle are welded. The root of the fillet weld is removed during the machining of the cap bore and the inner bore of the nozzle, thus eliminating defects at the weld root and ensuring full penetration of the weld after machining, thereby improving the overall weld quality. Compared to commonly used manufacturing methods, this method has some problems: First, there is a lack of reference when positioning the cap and nozzle. Second, since the inner bore of the nozzle and the cap bore are machined after welding, it is necessary to ensure both the perpendicularity of the nozzle centerline to the horizontal plane and the coincidence of the nozzle centerline with the cap centerline during the welding process. Therefore, designing an auxiliary device for welding the cap and nozzle is very important in this manufacturing method. Utility Model Content

[0003] To solve the above-mentioned technical problems, this utility model designs an auxiliary device for welding pipe caps and connecting pipes. This auxiliary device is mainly used for welding pipe caps and connecting pipes.

[0004] The present invention adopts the following technical solution:

[0005] An auxiliary device for welding pipe caps and connecting pipes includes a base and a positioning and fixing plate. Supporting positioning rods are fixedly installed on both sides of the base and the positioning and fixing plate. Adjusting bolts are respectively installed on the supporting positioning rods, and pipe clamps are fixedly installed at the ends of the adjusting bolts. The two pipe clamps are connected by a pipe clamp fixing device. The pipe clamps are used to clamp and position the lower part of the connecting pipe. A positioning hole is opened in the center of the positioning and fixing plate, which mates with the upper part of the connecting pipe. A circular mark is opened in the center of the base, and a positioning fixture tube is placed on the circular mark. The size of the circular mark matches the outer diameter of the bottom end of the positioning fixture tube, the height of the positioning fixture tube matches the height of the pipe cap, and the distance between the two supporting positioning rods matches the width of the pipe cap.

[0006] Preferably, the base is also equipped with an auxiliary positioning rod, the distance between the auxiliary positioning rod and the center of the base is the same as the distance between the support positioning rod and the center of the base.

[0007] Preferably, the base has a through hole corresponding to the support positioning rod, and the lower end of the support positioning rod has an external thread. After the lower end of the support positioning rod passes through the through hole, it is fixed to the base by a washer and a nut.

[0008] Preferably, the base has a through hole corresponding to the auxiliary positioning rod, and the lower end of the auxiliary positioning rod has an external thread. After the lower end of the auxiliary positioning rod passes through the through hole, it is fixed to the base by a washer and a nut.

[0009] Preferably, the pipe clamp fixing device consists of bolts, washers and nuts.

[0010] Preferably, the positioning and fixing plate has a mounting hole corresponding to the supporting positioning rod, the upper end of the supporting positioning rod has an external thread, and the upper end of the supporting positioning rod passes through the mounting hole and is fixed to the positioning and fixing plate by a wing nut.

[0011] Preferably, the circular imprint is formed by laser engraving.

[0012] Preferably, the support positioning rod and the auxiliary positioning rod are made of round steel with the same diameter.

[0013] The beneficial effects of this utility model are: the structure of this utility model is simple and reasonable. As an auxiliary device for welding the pipe cap and the connecting pipe, this device can assemble and position the pipe cap and the connecting pipe, and clamp and fix the connecting pipe. After the pipe cap and the connecting pipe are welded together, the perpendicularity requirements of the connecting pipe center line to the horizontal plane and the coincidence requirements of the connecting pipe center line and the pipe cap center line can be met, thus ensuring manufacturing precision and quality. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2This is the actual object of operation of this utility model;

[0016] Figure 3 This is a schematic diagram of the positioning of the actual work object of this utility model;

[0017] Figure 4 This is an assembly diagram of the actual working object of this utility model;

[0018] In the diagram: 1. Wing nut; 2. Positioning plate; 3. Supporting positioning rod; 4. Pipe clamp; 5. Adjusting bolt; 6. Auxiliary positioning rod; 7. Positioning tooling pipe; 8. Base; 9. Washer; 10. Nut; 11. Pipe clamp fixing device; 12. Connecting pipe; 13. Pipe cap. Detailed Implementation

[0019] The technical solution of this utility model will be further described in detail below through specific embodiments and with reference to the accompanying drawings:

[0020] Example: Figure 1 As shown, an auxiliary device for welding pipe caps and connecting pipes includes a wing nut 1, a positioning and fixing plate 2, a support positioning rod 3, a pipe clamp 4, an adjusting bolt 5, an auxiliary positioning rod 6, a positioning tooling pipe 7, a base 8, a gasket 9, a nut 10, and a pipe clamp fixing device 11. The support positioning rod 3 has external threads at both its upper and lower ends, and internal threads on its middle body. The wing nut 1 is threaded to the external thread at the upper end of the support positioning rod 3. The internal thread on the support positioning rod 3 is threaded to the adjusting bolt 5. After the adjusting bolt 5 is screwed into the internal thread of the support positioning rod 3, the pipe clamp 4 is welded to the bolt 5. The lower end of the auxiliary positioning rod 6 has external threads. The base 8 has three through holes, each with its central axis equidistant from the central axis of the base 8. Two of the centrally symmetrical through holes are threaded to the external threads at the lower end of the support positioning rod 3, and the other through hole is threaded to the external threads of the auxiliary positioning rod 6. The lower parts of the support positioning rod 3 and the auxiliary positioning rod 6 pass through the through hole and are fixed to the base 8 by the washer 9 and the nut 10. The center of the base 8 has a laser-engraved circular mark, which is coaxial with the base 8 and its diameter is the same as the diameter of the lower end of the positioning fixture tube.

[0021] like Figure 2 As shown, an auxiliary device for welding pipe caps and pipe fittings is actually used, including a pipe fitting 12 and a pipe cap 13. The inner hole of the pipe fitting 12 and the pipe hole of the pipe cap 13 are to be machined after welding.

[0022] like Figure 3As shown, an auxiliary device for welding pipe caps and nozzles is applied to the positioning of the nozzle in actual operation. A positioning fixing plate 2 is inserted into the upper part of a supporting positioning rod 3 and fixed with a wing nut 1. The central circular hole of the fixed positioning plate 2 is coaxial with the base 8. The nozzle 12 is inserted from bottom to top into the central circular hole of the fixing plate 2, and the positioning fixture tube 7 is placed with reference to the engraved ring mark on the base 8, so that the bottom surface of the lower end of the positioning fixture tube 7 coincides with the engraved ring. The nozzle 12 is placed on the positioning fixture tube 7, and the lower surface of the nozzle 12 coincides with the upper surface of the positioning fixture tube 7. The adjusting bolt 5 is screwed in to make the pipe clamps 4 on both sides completely fit together, and the pipe clamp fixing device 11 is used to fix the pipe clamps 4 on both sides, thereby fixing the nozzle 12 in the assembly position.

[0023] like Figure 4 As shown, an auxiliary device for welding pipe caps and connecting pipes is used in actual operation. After the connecting pipe 12 is completely positioned and fixed and the positioning tooling pipe 7 is taken out, the pipe cap 13 is slowly pushed in from the middle of the two positioning support rods 3 and the pipe cap 13 is brought into contact with the positioning auxiliary rod 6.

[0024] The center of the base 8 is equidistant from the nearest points of the positioning support rod 3 and the auxiliary positioning rod 6, and its length is equal to the radius of the cap 13. When the cap 13 is pushed in from between the two positioning support rods 3 and comes into contact with the auxiliary positioning rod 6, the cap 13 is placed in its assembly position. At this point, the central axes of the pipe 12, cap 13, and base 8 are all on a straight line. Because the upper part of the pipe 12 is fixed and limited by the positioning plate 2, and the lower part is fixed and limited by the pipe clamp 4, the vertical inclination of the welded pipe 12 due to welding heat deformation is minimal in actual welding operations, fully meeting the manufacturing requirements for the post-weld machining of the inner hole of the pipe 12 and the pipe hole of the cap 13.

[0025] The embodiments described above are merely preferred solutions of this utility model and are not intended to limit this utility model in any way. Other variations and modifications are possible without departing from the technical solutions described in the claims.

Claims

1. An auxiliary device for pipe cap and pipe welding, comprising a base and a positioning fixing plate, characterized in that, Supporting positioning rods are fixedly installed on both sides of the base and the positioning plate. Adjusting bolts are installed on the supporting positioning rods, and pipe clamps are fixedly installed at the ends of the adjusting bolts. The two pipe clamps are connected by a pipe clamp fixing device. The pipe clamps are used to clamp and position the lower part of the pipe wall. A positioning hole is opened in the center of the positioning plate, which mates with the upper part of the pipe wall. A circular mark is opened in the center of the base, and a positioning tool tube is placed on the circular mark. The size of the circular mark matches the outer diameter of the bottom end of the positioning tool tube, and the height of the positioning tool tube matches the height of the pipe cap. The distance between the two supporting positioning rods matches the width of the pipe cap.

2. An auxiliary device for welding of a pipe cap to a pipe according to claim 1, characterized in that The base is also equipped with an auxiliary positioning rod, and the distance between the auxiliary positioning rod and the center of the base is the same as the distance between the support positioning rod and the center of the base.

3. An auxiliary device for welding of a pipe cap to a pipe according to claim 1, characterized in that, The base has a through hole corresponding to the support positioning rod. The lower end of the support positioning rod has an external thread. After the lower end of the support positioning rod passes through the through hole, it is fixed to the base by a washer and a nut.

4. An auxiliary device for welding of a pipe cap to a pipe according to claim 2, characterized in that, The base has a through hole corresponding to the auxiliary positioning rod. The lower end of the auxiliary positioning rod has an external thread. After the lower end of the auxiliary positioning rod passes through the through hole, it is fixed to the base by a washer and a nut.

5. The device according to claim 1, wherein, The pipe clamp fixing device consists of bolts, washers and nuts.

6. An apparatus for assisting in the welding of a pipe cap to a pipe stem as defined in claim 1, wherein, The positioning and fixing plate has mounting holes corresponding to the supporting positioning rod. The upper end of the supporting positioning rod has external threads. After the upper end of the supporting positioning rod passes through the mounting holes, it is fixed to the positioning and fixing plate by a wing nut.

7. An auxiliary device for welding of a pipe cap to a pipe according to claim 1, characterized in that, The circular imprint is formed by laser engraving.

8. An auxiliary device for welding of a pipe cap to a pipe according to claim 2, characterized in that, The support positioning rod and the auxiliary positioning rod are made of round steel with the same diameter.

Images