Copper-aluminum dissimilar welding device for submarine cable joint

Abstract

The invention provides a copper-aluminum dissimilar welding device for a submarine cable connector, which comprises a rotary friction welding device, the rotary friction welding device comprises a rotary part and a propelling part which are arranged at an interval, the rotary part is provided with a first clamping cavity for clamping a copper bar, and the propelling part is provided with a second clamping cavity for clamping an aluminum bar; and the extrusion sleeve assembly is arranged between the first clamping cavity and the second clamping cavity, the extrusion sleeve assembly, the first clamping cavity and the second clamping cavity are coaxially arranged, the extrusion sleeve assembly is rotatably arranged, and the extrusion sleeve assembly can conduct rotary friction with the deformation part of the aluminum bar and limit radial deformation of the deformation part when rotating. According to the copper-aluminum dissimilar welding device for the submarine cable connector, the filling effect of an aluminum bar in the groove can be ensured while the depth of the groove in the periphery of the flange can be set deep, and therefore the quality of the submarine cable connector is improved.

Description

Technical Field

[0001] This invention generally relates to the field of welding technology, and specifically to a copper-aluminum dissimilar welding device for submarine cable joints. Background Technology

[0002] To reduce costs, submarine cables typically combine copper-core and aluminum-core cables, requiring a cable joint for connection. A cable joint usually consists of a copper rod and an aluminum rod, which are rotary friction welded together. The end of the copper rod furthest from the aluminum rod is welded to the copper core of the copper-core cable, and the end of the aluminum rod furthest from the copper rod is welded to the aluminum core of the aluminum-core cable. To improve the weld strength between the copper and aluminum rods, a flange is usually machined on the end face of the copper rod, with a groove formed on its outer periphery. After rotary friction welding, the aluminum rod wraps around the flange.

[0003] However, the aforementioned submarine cable joints have the following problems:

[0004] If the groove depth on the outer periphery of the flange is too deep, gaps may easily appear within the groove, affecting the mechanical properties of the submarine cable joint; if the groove depth on the outer periphery of the flange is too shallow, the bonding strength between the copper rod and the aluminum rod will be affected. Summary of the Invention

[0005] In view of the above-mentioned defects or deficiencies in the prior art, it is desirable to provide a copper-aluminum dissimilar welding device for submarine cable joints.

[0006] This application also provides a copper-aluminum dissimilar welding device for submarine cable joints, comprising:

[0007] A rotary friction welding device includes a rotating part and a pushing part arranged at intervals. The rotating part has a first clamping cavity for clamping copper rods, and the pushing part has a second clamping cavity for clamping aluminum rods.

[0008] An extrusion sleeve assembly is disposed between a first clamping cavity and a first clamping cavity. The extrusion sleeve assembly, the first clamping cavity, and the first clamping cavity are coaxially arranged. The extrusion sleeve assembly is rotatably disposed, wherein when the extrusion sleeve assembly rotates, it can perform rotational friction with the deformed portion of the aluminum rod and limit the radial deformation of the deformed portion.

[0009] Furthermore, the inner cavity of the extrusion sleeve assembly is provided with a push-fit ring, and the push-fit ring is located at the end of the extrusion sleeve assembly away from the second clamping cavity.

[0010] Furthermore, the extrusion sleeve assembly includes a coaxial first extrusion sleeve and a second extrusion sleeve, the second extrusion sleeve being located on the side of the first extrusion sleeve near the first clamping cavity, and the second extrusion sleeve being movably disposed in a direction close to or away from the first extrusion sleeve, wherein the push-fit ring is located in the second extrusion sleeve.

[0011] Furthermore, the first extrusion sleeve and the second extrusion sleeve are elastically pressed together, and the second extrusion sleeve moves away from the first extrusion sleeve under the pushing of the deformed part.

[0012] Furthermore, the first extrusion sleeve is provided with a plurality of mounting holes that extend axially and are spaced apart circumferentially along the first extrusion sleeve. The second extrusion sleeve is provided with a plurality of connecting rods that correspond one-to-one with the plurality of mounting holes at one end of the first extrusion sleeve. The connecting rods pass through the corresponding mounting holes and are provided with a stop at the end of the connecting rod. An elastic element is provided around the outer periphery of the connecting rod and the two ends of the elastic element abut against the first extrusion sleeve and the stop respectively.

[0013] Furthermore, the stop is movably positioned along the circumferential direction of the connecting rod.

[0014] The copper-aluminum dissimilar welding device for submarine cable joints provided in this application features a coaxial extrusion sleeve assembly between the first clamping chamber and the first clamping chamber of a rotary friction welding device. The extrusion sleeve assembly is rotatably configured and, when rotating, can rotate and rub against the deformed portion of the aluminum rod, limiting the radial deformation of the deformed portion. This increases the plastic flow of the deformed portion of the aluminum rod, allowing it to fill the groove around the outer periphery of the copper rod flange more effectively. This avoids gaps within the groove around the flange, allowing for a deeper groove depth while ensuring the filling effect of the aluminum rod, thereby improving the quality of the submarine cable joint. Attached Figure Description

[0015] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0016] Figure 1 This is a half-sectional schematic diagram of the extrusion sleeve assembly provided in the embodiments of this application. Detailed Implementation

[0017] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings.

[0018] Please refer to the attached document. Figure 1This application provides a copper-aluminum dissimilar welding device for submarine cable joints, used to weld copper rods 10 and aluminum rods 20 together in a submarine cable joint. The submarine cable joint includes copper rods 10 and aluminum rods 20 of the same diameter. The welding end of the copper rod 10 is provided with a flange 11 and an annular groove 12 is formed on the outer periphery of the flange 11. The welding ends of the copper rod 10 and the aluminum rod 20 are welded together by the copper-aluminum dissimilar welding device, wherein when the aluminum rod 20 and the copper rod 10 are welded together, the welding end of the aluminum rod 20 covers the flange 11.

[0019] The copper-aluminum dissimilar welding apparatus includes a rotary friction welding device and an extrusion sleeve assembly 200. The rotary friction welding device includes a frame and a rotating part and a pushing part spaced apart from each other on the frame. The rotating part has a first clamping cavity for clamping a copper rod 10, and the pushing part has a second clamping cavity for clamping an aluminum rod 20. The extrusion sleeve assembly 200 is disposed between the first clamping cavities, and the extrusion sleeve assembly 200, the first clamping cavities, and the extrusion sleeve assembly 200 are coaxially arranged. When the copper rod 10 is installed in the first clamping cavity and the aluminum rod 20 is installed in the second clamping cavity, the extrusion sleeve assembly 200 is sleeved on the outer periphery of the welding end of the copper-aluminum rod 20. The inner diameter of the extrusion sleeve assembly 200 is larger than the diameter of the copper-aluminum rod 20, so that a first gap 201 is formed between the extrusion sleeve assembly 200 and the outer periphery of the welding end of the copper-aluminum rod 20, and the first gap 201 allows the deformed portion of the welding end of the aluminum rod 20 to pass through.

[0020] The extrusion sleeve assembly 200 is rotatably configured, wherein, during rotation, the extrusion sleeve assembly 200 can perform rotational friction with the welding end of the aluminum rod 20 and restrict the radial plastic flow of the welding end. Specifically, during rotational friction welding, the welding end of the aluminum rod 20 undergoes plastic deformation flow (plastic deformation flow includes radial plastic deformation flow and axial plastic deformation flow) under the friction of the copper rod 10. During the radial plastic deformation process, the welding end of the aluminum rod 20 contacts the inner surface of the extrusion sleeve assembly 200 and performs rotational friction engagement. The outer periphery of the aluminum rod 20 weld end is also subjected to rotational friction from the extrusion sleeve assembly 200, which gives the aluminum rod 20 weld end better plastic deformation flow capability and improves the overall plastic flow of the aluminum rod 20 weld end. At the same time, the extrusion sleeve assembly 200 restricts the radial plastic deformation of the aluminum rod 20 weld end and constrains more of the deformed part in the aluminum rod 20 weld end to undergo axial plastic deformation, so that the aluminum rod 20 weld end can better fill the groove 12 on the outer periphery of the flange 11, avoiding the existence of gaps in the groove 12 on the outer periphery of the flange 11. In this way, the depth of the groove 12 on the outer periphery of the flange 11 can be set relatively deep while ensuring the filling effect of the aluminum rod 20 in the groove 12, improving the bonding strength between the copper rod 10 and the aluminum rod 20, and thus improving the quality of the submarine cable joint.

[0021] When using the above-mentioned welding device, the copper rod 10 is first clamped by the rotating part and the aluminum rod 20 is clamped by the pushing part. Then, the pushing part moves so that the aluminum rod 20 passes into the extrusion sleeve assembly 200 and abuts against the end face of the flange 11. Next, the position of the extrusion sleeve assembly 200 is adjusted until the set position is reached (at the set position, the extrusion sleeve assembly 200 is fitted around the outer periphery of the welding end of the copper and aluminum rods 20). Then, the rotary friction welding is started. During the rotary friction welding process: the welding end of the aluminum rod 20 undergoes plastic deformation due to frictional heat and is pushed axially by the pusher. In the radial plastic flow, the welded end of the aluminum rod 20 will form a rotational friction contact with the rotating extrusion sleeve assembly 200 during the deformation process. After a certain period of rotational friction welding, the rotational friction welding is stopped and upsetting and pressure holding treatment is performed. When the rotating part stops rotating, the extrusion sleeve assembly 200 also stops rotating synchronously. During the upsetting and pressure holding process, the extrusion sleeve assembly 200 can better squeeze the plastic flow part in the welded end of the aluminum rod 20 into the groove 12 on the outer periphery of the flange 11, avoiding the occurrence of filling gaps in the groove 12.

[0022] The frame includes a first mounting bracket and a second mounting bracket. The second mounting bracket is slidably disposed on the first mounting bracket and located above the extrusion sleeve assembly 200. The second mounting bracket is equipped with a rotating clamp that holds the extrusion sleeve assembly 200. The first mounting bracket is equipped with a linear driver and is connected to the second mounting bracket via the linear driver to drive the rotating clamp to move along the axial direction of the extrusion sleeve assembly 200, thereby adjusting the position of the extrusion sleeve assembly 200.

[0023] The width of the first gap 201 can be, but is not limited to, 2-5 mm. When the position is set, the distance between the welding end face of the copper rod 10 and the end face of the extrusion sleeve assembly 200 near the first clamping cavity is 5-10 mm.

[0024] It should be understood that both the rotating part and the propulsion part are known structures in existing rotary friction welding devices, such as the rotating part being a rotary clamp and the propulsion part being a hydraulic axial drive mechanism, etc., which will not be described in detail here.

[0025] In some embodiments of this application, the inner cavity of the extrusion sleeve assembly 200 is provided with a push-fit ring 223, and the push-fit ring 223 is located at the end of the extrusion sleeve assembly 200 away from the second clamping cavity. The aforementioned push-fit ring 223 can restrict the axial plastic flow of the aluminum rod 20 welding end, increase the radial plastic flow of the aluminum rod 20 welding end, and improve the filling effect of the aluminum rod 20 welding end in the groove 12.

[0026] Optionally, the inner ring surface of the push-fit ring 223 is a frustum conical surface and the small-diameter end is located close to the first clamping cavity.

[0027] In some embodiments of this application, the extrusion sleeve assembly 200 includes a coaxial first extrusion sleeve 210 and a second extrusion sleeve 220. The second extrusion sleeve 220 is located on the side of the first extrusion sleeve 210 near the first clamping cavity. A push-fit ring 223 is disposed in the inner cavity of the second extrusion sleeve 220. The second extrusion sleeve 220 is movably disposed in a direction approaching or away from the first extrusion sleeve 210. Normally, the second extrusion sleeve 220 and the first extrusion sleeve 210 are in a state of end-face contact. When the second extrusion sleeve 220 moves along the direction of the first extrusion sleeve 210, a second gap is formed between the second extrusion sleeve 220 and the first extrusion sleeve 210. This second gap can change with the displacement of the second extrusion sleeve 220. The entire rotary friction welding process can be divided into a rotary friction stage and an upsetting and holding stage. In the rotary friction stage, due to the presence of the flange 11 and the groove 12, the axial plastic deformation resistance of the deformed part in the welded end of the aluminum rod 20 is relatively small in the first gap 201. However, in the upsetting and holding stage, since the outer periphery of the flange 11 is already covered with the plastic deformation part of the aluminum rod 20, the flow of the deformed part in the welded end of the aluminum rod 20 in the first gap 201 is relatively large. This will push the push-fit ring 223 to move away from the first extrusion sleeve 210. During the movement of the second extrusion sleeve 220, the first gap... The gap 201 is extended to increase the volume of the first gap 201. The main part of the deformed part of the welded end of the aluminum rod 20 flows in the first gap 201 under the guidance of the second extrusion sleeve 220. The other part of the deformed part of the welded end of the aluminum rod 20 fills the second gap. This not only achieves better extrusion of the deformed part of the aluminum rod 20 into the groove 12, making the deformed part of the aluminum rod 20 fill the groove 12 more densely, but also avoids the situation where the welded end of the aluminum rod 20 plastically flows towards the second clamping cavity due to the small gap between the extrusion sleeve assembly 200 and the copper-aluminum rod 20 during the upsetting and holding pressure process.

[0028] To prevent the deformed portion of the aluminum rod 20 from flowing out of the second gap into the extrusion sleeve assembly 200, an annular slot 213 is provided at the end of the first extrusion sleeve 210 near the second extrusion sleeve 220, and an annular protrusion 221 is provided at the end of the second extrusion sleeve 220 near the first extrusion sleeve 210. The protrusion 221 is inserted into the slot 213. When the second extrusion sleeve 220 moves away from the first extrusion sleeve 210, a portion of the protrusion 221 moves out of the slot 213, and the moved portion of the protrusion 221 can block the flow of the deformed portion of the aluminum rod 20, thereby preventing the deformed portion of the aluminum rod 20 from flowing out of the extrusion sleeve assembly 200 during the upsetting stage.

[0029] The first and second extrusion sleeves are both made of tungsten-cobalt alloy and have a titanium nitride coating on their surfaces to prevent the extrusion sleeves from sticking to the deformed parts of the copper-aluminum rods and to facilitate the disassembly of the extrusion sleeve assembly.

[0030] In some embodiments of this application, the first extrusion sleeve 210 and the second extrusion sleeve 220 are elastically pressed together, and the second extrusion sleeve 220 moves away from the first extrusion sleeve 210 under the pushing force of the deformed portion. This configuration allows the second extrusion sleeve 220 to move automatically under the action of the deformed portion of the aluminum rod 20, and to automatically adapt to the corresponding displacement according to the thrust of the deformed portion of the aluminum rod 20. This avoids the need for an additional drive mechanism to adapt and adjust the movement of the second extrusion sleeve 220, simplifying the structure of the welding device.

[0031] Optionally, the first extrusion sleeve 210 is provided with a plurality of mounting holes that extend through the axial direction. The plurality of mounting holes are spaced apart along the circumference of the first extrusion sleeve 210. The second extrusion sleeve 220 is provided with a plurality of connecting rods 222 corresponding to the plurality of mounting holes at one end near the first extrusion sleeve 210. The connecting rods 222 pass through the corresponding mounting holes. The ends of the connecting rods 222 are provided with stop members. The outer periphery of the connecting rods 222 is fitted with elastic members 240, and the two ends of the elastic members 240 abut against the first extrusion sleeve 210 and the stop members, respectively. Preferably, the mounting hole is a stepped hole and includes a connected first hole segment 211 and a second hole segment 212. The second hole segment 212 is located on the side of the first hole segment 211 away from the second extrusion sleeve 220, and the diameter of the second hole segment 212 is larger than the diameter of the first hole segment 211. The connecting rod 222 is slidably engaged with the first hole segment 211. The stop member is a stop ring 230, and the elastic member 240 is a spring located in the second hole segment 212. The two ends of the spring abut against the stepped surface of the mounting hole and the stop ring 230, respectively. The slot 213 is located on the side of the mounting hole closer to the axis of the first extrusion sleeve 210.

[0032] Optionally, to adjust the plastic flow resistance of the deformed portion of the welded end of the aluminum rod 20 in the first gap 201 during the upsetting and holding stage, the stop member is movably positioned along the circumferential direction of the connecting rod 222. When the position of the stop member is adjusted, the force exerted by the elastic element 240 on the second extrusion sleeve 220 also changes, thereby changing the force driving the second extrusion sleeve 220 to move. Preferably, the connecting rod 222 has a threaded section and the stop ring 230 is screwed onto the threaded section, so that the position adjustment of the stop member is simple and convenient.

[0033] It should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., used above to indicate orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present 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 present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, unless otherwise stated, "a plurality of" means two or more.

[0034] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A copper-aluminum dissimilar welding device for submarine cable joints, characterized in that, include: A rotary friction welding device includes a rotating part and a pushing part arranged at intervals. The rotating part has a first clamping cavity for clamping a copper rod, and the pushing part has a second clamping cavity for clamping an aluminum rod. An extrusion sleeve assembly is disposed between the first clamping cavity and the first clamping cavity. The extrusion sleeve assembly, the first clamping cavity, and the first clamping cavity are coaxially arranged. The extrusion sleeve assembly is rotatably disposed. When the extrusion sleeve assembly rotates, it can rotate and rub against the deformed portion of the aluminum rod and limit the radial deformation of the deformed portion.

2. The copper-aluminum dissimilar welding device for submarine cable joints according to claim 1, characterized in that, The inner cavity of the extrusion sleeve assembly is provided with a push-fit ring, and the push-fit ring is located at the end of the extrusion sleeve assembly away from the second clamping cavity.

3. The copper-aluminum dissimilar welding device for submarine cable joints according to claim 2, characterized in that, The compression sleeve assembly includes a coaxial first compression sleeve and a second compression sleeve, the second compression sleeve being located on the side of the first compression sleeve near the first clamping cavity, and the second compression sleeve being movably disposed in a direction close to or away from the first compression sleeve, wherein the push-fit ring is located in the second compression sleeve.

4. The copper-aluminum dissimilar welding device for submarine cable joints according to claim 3, characterized in that, The first extrusion sleeve and the second extrusion sleeve are elastically pressed together, and the second extrusion sleeve moves away from the first extrusion sleeve under the pushing of the deformed part.

5. The copper-aluminum dissimilar welding device for submarine cable joints according to claim 4, characterized in that, The first extrusion sleeve has a plurality of mounting holes that extend through the axial direction and are spaced apart around the circumference of the first extrusion sleeve. The second extrusion sleeve has a plurality of connecting rods that correspond one-to-one with the plurality of mounting holes at one end near the first extrusion sleeve. The connecting rods pass through the corresponding mounting holes and have a stop at the end of the connecting rod. An elastic element is fitted around the outer periphery of the connecting rod and the two ends of the elastic element abut against the first extrusion sleeve and the stop, respectively.

6. The copper-aluminum dissimilar welding device for submarine cable joints according to claim 5, characterized in that, The stop is movably positioned along the circumferential direction of the connecting rod.

7. The copper-aluminum dissimilar welding device for submarine cable joints according to claim 3, characterized in that, The first extrusion sleeve has an annular slot at one end near the second extrusion sleeve, and the second extrusion sleeve has an annular protrusion at one end near the first extrusion sleeve, the protrusion being inserted into the slot.

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