Submarine cable conductor welding tool

Abstract

The utility model discloses a submarine cable conductor welding tool and belongs to the technical field of submarine cable manufacturing. The device is characterized in that the device comprises four split pressing dies, and every two split pressing dies form a group to form two groups of pressing modules which are respectively used for fixing the end parts of two conductors to be welded; the inner side faces of the four split pressing dies are respectively provided with a semicircular groove, the semicircular grooves of the two split pressing dies in the same group are oppositely combined to form central round holes for pressing conductors, the ends of the two conductors to be welded are respectively pressed and fixed in the two central round holes, the inner side end faces of the two groups of pressing modules are attached, and the central round holes are coaxial. Therefore, the joint areas of the two conductors to be welded are tightly attached together stably. According to the welding tool, the conductors can be tightly pressed and fixed, then the conductors at the two ends are welded together through the friction stir welding technology, combination is simple, operation is convenient and fast, the disassembly and assembly procedures are simplified, stability and reliability are achieved, and the joint quality and reliability are greatly improved.

Description

Technical Field

[0001] This utility model relates to a welding fixture for submarine cable conductors, belonging to the field of submarine cable manufacturing technology. Background Technology

[0002] Submarine cables typically use pure copper conductors. However, due to their high production costs, aluminum conductors are increasingly being used to replace copper conductors for the same transmission capacity, significantly reducing production costs. When using aluminum conductors, copper conductors are required at both ends of the conductor to connect to terminal equipment in order to reduce losses and increase current carrying capacity. Therefore, submarine cable conductors are usually copper-aluminum-copper structures, and welded joints must be made between the copper and aluminum conductors. Friction stir welding is widely used for welding similar or dissimilar metals such as copper, aluminum, and magnesium. This welding method generates less heat during the welding process, produces high-strength welds, and can closely resemble the base material.

[0003] However, as Figure 1 As shown, the welding fixture 1 currently used for welding submarine cable conductors (the stirring pin 2 of friction stir welding is welded in the direction of the arrow) has a poor fixing effect, which causes the joint area of ​​the two conductors 3 to be unstable during the welding process, and cannot be well matched with friction stir welding to make the welded joint of copper-aluminum conductors. Utility Model Content

[0004] The technical objective of this invention is to address the shortcomings of the prior art by providing a welding fixture for submarine cable conductors, which can be used in conjunction with friction stir welding to create welded joints for stranded conductors.

[0005] The technical solution of this utility model is as follows:

[0006] A welding fixture for submarine cable conductors is characterized by comprising four separate clamping dies, arranged in pairs to form two sets of clamping modules, each used to fix the ends of two conductors to be welded. The inner surfaces of each of the four separate clamping dies are provided with semi-circular grooves. The semi-circular grooves of two separate clamping dies in the same set align to form a central circular hole for pressing the conductor. The ends of the two conductors to be welded are respectively pressed into two central circular holes. The inner end faces of the two sets of clamping modules are abutted, and the central circular holes are coaxial, thereby firmly and tightly bonding the joint areas of the two conductors to be welded together. The material of the separate clamping dies is the same as that of the conductors to be welded, and the overall shape is rectangular.

[0007] Furthermore, the two separate pressing molds in the same group are connected into one piece by two mating π-shaped fixing plates, and the outer side of the separate pressing mold is provided with a limiting groove that matches the π-shaped fixing plate.

[0008] The four π-shaped fixing plates are arranged in two groups respectively, and are assembled with a group of pressing modules correspondingly. The width of the π-shaped fixing plate matches the limiting groove of the split pressing mold, and each side of the π-shaped fixing plate is provided with a connecting lug. The corresponding positions of the π-shaped fixing plate and the split pressing mold are respectively provided with bolt through holes, and the connecting lug is also provided with a threaded through hole. After the split pressing molds in the same group are closed and the π-shaped fixing plates in the same group are closed, the split pressing molds and the π-shaped fixing plates in the same group are locked by using bolts, nuts and gaskets to press and fix the conductor in the center hole of the pressing mold group.

[0009] Further, the semicircular groove is sequentially connected by a first semicircular groove, a second semicircular groove and a third semicircular groove. The inner diameter of the first semicircular groove and the inner diameter of the third semicircular groove are equal and smaller than the diameter of the conductor. The first semicircular groove is a welding area. Since the conductor is twisted by a plurality of metal filaments, there are inevitable gaps between the filaments. Therefore, the inner diameter of the first semicircular groove is slightly smaller than the diameter of the conductor, so as to press the conductor. The inner diameter of the second semicircular groove is greater than the diameter of the conductor, and is used to place a rubber non-slip pad to prevent the conductor from being extruded by the stirring needle during welding.

[0010] Further, the limiting groove corresponds to the position of the second semicircular groove, which facilitates the determination of the installation position of the π-shaped fixing plate and the split pressing mold, and improves the fixing effect. On both sides of the second semicircular groove, a bolt through hole is arranged for fastening and installing the π-shaped fixing plate.

[0011] Further, it further includes eight groups of powder feeding assemblies. Each split pressing mold is respectively provided with two powder feeding inclined holes, and the two powder feeding inclined holes are symmetrically arranged along the semicircular groove. The powder feeding inclined hole extends from the inner side end face to the outer side end face of the split pressing mold. The inner side end face is the abutting surface of the two groups of pressing modules.

[0012] Since there are gaps between the filaments of the stranded conductor of the submarine cable, material shortage may occur during welding, which may cause welding cracks. Therefore, during the welding process, the same kind of metal powder can be supplemented to the welding joint area in time through the cooperation of the powder feeding assembly and the corresponding powder feeding inclined hole, so as to avoid welding defects caused by material shortage.

[0013] Further, the powder feeding assembly includes a piston, a sealing rubber ring and a fastening stud. The sealing rubber ring and the fastening stud are respectively provided with a central hole through which a gas pipe passes. The powder feeding inclined hole is sequentially connected by a first inclined hole, a second inclined hole and a third inclined hole. The end of the first inclined hole is located at the inner side end face of the split pressing mold, and the piston is located in the first inclined hole. The aperture of the second inclined hole is greater than that of the first inclined hole, and the sealing rubber ring is located in the second inclined hole. The end of the third inclined hole is located at the outer side end face of the split pressing mold, and the third inclined hole is a threaded hole matched with the fastening stud. The central hole of the fastening stud is provided with an inner hexagonal hole at the outer side end.

[0014] Each piece of split compression mold is provided with two powder feeding inclined holes, the first inclined hole region is a metal powder cavity, the metal powder of the same material as the conductor is placed, and the piston is located behind the metal powder (close to one end of the second inclined hole). The second inclined hole region is a placement area of a sealing rubber ring, and the third inclined hole region is provided with an internal thread, so that the fastening stud can be screwed in to fix the sealing rubber ring. In use, the air pipe of the external air source is inserted from the center hole of the fastening stud and the center hole of the sealing rubber ring, the piston is pushed by air pressure, the piston is displaced along the first inclined hole, the metal powder is sent into the conductor welding joint area from the end of the first inclined hole (located on the inner end surface of the split compression mold), and the metal powder is replenished in time.

[0015] The welding tool can tightly fix the conductors, and then the two conductors are welded by using the friction stir welding technology, so that the welding tool is simple in combination, convenient to operate, simplifies the disassembly and assembly process, is stable and reliable, and greatly improves the joint quality and reliability. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a schematic view of welding two conductors by using the friction stir welding in the background art;

[0017] Figure 2 It is a structural schematic view of the welding tool;

[0018] Figure 3 It is a structural schematic view of the welding tool (remove one piece of split compression mold);

[0019] Figure 4 It is a structural schematic view of the split compression mold in the utility model;

[0020] Figure 5 It is an installation schematic view of the split compression mold and the powder feeding assembly in the utility model;

[0021] Figure 6 It is a sectional view of the split compression mold in the utility model;

[0022] Figure 7 It is a structural schematic view of the powder feeding assembly in the utility model;

[0023] In the drawing: welding tool 1, stirring needle 2, conductor 3, split compression mold 4, semicircular groove 5, first semicircular groove 5-1, second semicircular groove 5-2, third semicircular groove 5-3, π-shaped fixing plate 6, limiting groove 7, bolt through hole 8, powder feeding inclined hole 9, first inclined hole 9-1, second inclined hole 9-2, third inclined hole 9-3, piston 10, sealing rubber ring 11, fastening stud 12, internal hexagonal hole 12-1. DETAILED DESCRIPTION

[0024] The utility model provides a kind of submarine cable conductor welding tool, including four pieces of split compression mould 4, two two a group, form two groups of compression mould module.The inner side of four pieces of split compression mould is respectively equipped with semicircular groove 5, and the semicircular groove of two split compression moulds of same group is matched to form the center hole of compression conductor, and the end portion of two conductors to be welded is respectively pressed in two center holes, and the inner side end surface of two groups of compression mould module is matched and the center hole is coaxial, so that the joint area of two conductors to be welded is tightly adhered together stably.

[0025] Two split compression moulds of same group are connected into an organic whole by two matched π-shaped fixing plates 6, and the outer side of split compression mould is equipped with limiting groove 7 matched with π-shaped fixing plate.π-shaped fixing plate is equipped with four pieces, two two a group, and is assembled to a group of compression mould module respectively.π-shaped fixing plate is equipped with one connecting lug on each side, and bolt through hole 8 is arranged at the corresponding position of π-shaped fixing plate and split compression mould, and threaded through hole is also arranged on connecting lug, after the matching of split compression mould of same group and the matching of π-shaped fixing plate (installed in limiting groove) of same group, bolt, nut and gasket are used to lock split compression mould of same group and π-shaped fixing plate, so as to press the conductor to be welded in the center hole of compression mould module.

[0026] In an embodiment of the utility model, semicircular groove 5 is sequentially connected by first semicircular groove 5-1, second semicircular groove 5-2 and third semicircular groove 5-3.The inner diameter of first semicircular groove is equal to the inner diameter of third semicircular groove, and slightly smaller than the diameter of conductor, so as to compress the conductor.The inner diameter of second semicircular groove is greater than the diameter of conductor, and is used to place rubber non-slip pad.

[0027] In an embodiment of the utility model, eight groups of powder feeding assemblies are arranged, two powder feeding inclined holes 9 are arranged on each split compression mould, and the two powder feeding inclined holes are symmetrically arranged along semicircular groove.Powder feeding assembly includes piston 10, sealing rubber ring 11 and fastening stud 12, and the center hole for gas pipe is arranged in sealing rubber ring and fastening stud.Powder feeding inclined hole 9 is sequentially connected by first inclined hole 9-1, second inclined hole 9-2 and third inclined hole 9-3.The end of first inclined hole is located at the inner side end surface of split compression mould, and piston is located in first inclined hole;The aperture of second inclined hole is greater than the aperture of first inclined hole, and sealing rubber ring is located in second inclined hole;The end of third inclined hole is located at the outer side end surface of split compression mould, and third inclined hole is threaded hole matched with fastening stud, and the center hole of fastening stud is provided with inner hexagonal hole 12-1 at the outer side end, so as to cooperate with hexagonal wrench to tighten fastening stud.

[0028] When welding, about 1 meter length of each end of the two submarine cables to be connected is reserved, and each layer structure except the conductor is stripped from outside to inside. The conductor end to be welded is polished flat and cleaned of debris and other impurities, two sets of split compression molds are placed one by one, and the conductor end to be welded is tightly compressed in the semicircular groove, and the conductor end to be welded is flush with the inner side surface of the split compression mold, and the π-shaped fixing plate is used to cover the split compression mold and tighten the bolt.

[0029] Metal powder of the same material as the conductor is loaded into the powder feeding inclined hole and compacted, and the piston and sealing rubber ring are loaded in turn, and the fixing stud is tightened. The two sets of conductor ends to be welded and the welding tool are placed opposite to each other, tightly close together and fixed on the workbench, and then the friction stir welding machine is used to start welding.

Claims

1. A welding fixture for submarine cable conductors, characterized in that, It includes four separate pressing molds, which are arranged in pairs to form two sets of pressing modules. The inner sides of the four separate pressing molds are provided with semi-circular grooves. The semi-circular grooves of the two separate pressing molds in the same group are aligned to form the central circular hole for pressing the conductor. The inner end faces of the two sets of pressing modules are in contact and the central circular holes are coaxial.

2. The welding fixture for submarine cable conductors according to claim 1, characterized in that, Two separate pressing molds in the same group are connected into one piece by two mating π-shaped fixing plates. The outer side of the separate pressing mold is provided with a limiting groove that matches the π-shaped fixing plate.

3. The welding fixture for submarine cable conductors according to claim 1, characterized in that, The semicircular groove is formed by a first semicircular groove, a second semicircular groove, and a third semicircular groove connected in sequence; the inner diameter of the first semicircular groove and the inner diameter of the third semicircular groove are equal and smaller than the conductor diameter, while the inner diameter of the second semicircular groove is larger than the conductor diameter.

4. The welding fixture for submarine cable conductors according to claim 3, characterized in that, The second semicircular groove is equipped with a rubber anti-slip pad.

5. The welding fixture for submarine cable conductors according to claim 1, characterized in that, It also includes eight powder feeding components. Each split pressing mold is provided with two powder feeding oblique holes, which are symmetrically arranged along the semi-circular groove. The powder feeding oblique holes extend from the inner end face of the split pressing mold to the outer end face, and the inner end face is the mating surface of the two pressing modules.

6. The welding fixture for submarine cable conductors according to claim 5, characterized in that, The powder feeding assembly includes a piston, a sealing rubber ring, and a fastening stud. The sealing rubber ring and the fastening stud are each provided with a central hole through which the air supply pipe passes.

7. The welding fixture for submarine cable conductors according to claim 6, characterized in that, The powder feeding oblique hole is formed by a first oblique hole, a second oblique hole, and a third oblique hole connected in a continuous manner; the end of the first oblique hole is located on the inner end face of the split pressing mold, and the piston is located in the first oblique hole; the diameter of the second oblique hole is larger than the diameter of the first oblique hole, and the sealing rubber ring is located in the second oblique hole; the end of the third oblique hole is located on the outer end face of the split pressing mold, and the third oblique hole is a threaded hole that matches the fastening stud.

8. The welding fixture for submarine cable conductors according to claim 7, characterized in that, The center hole of the fastening stud has an internal hexagonal hole at its outer end.

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