Open-close type annular coil applied to electromagnetic pulse power cable joint connection

Abstract

The invention discloses an open-close type annular coil applied to electromagnetic pulse power cable joint connection, which comprises two semicircular annular coils which are arranged in a central symmetry manner, two ends of each annular coil are provided with ports which are connected in or out of an external power supply platform, the connecting ports of the two annular coils are not adjacent to each other, and the connecting ports of the two annular coils are not adjacent to each other. Each annular coil is arranged on the corresponding insulating ring, and the opposite faces of the two insulating rings are provided with inserting structures capable of achieving combination of the insulating rings. The whole processing is simple, the production is easy, the mechanical strength is high, the service life is long, and the switching of the opening and closing states of the coil can be quickly realized during welding, so that the problem of processing limitation of the traditional closing coil is solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of power cable welding, and particularly relates to an opening and closing type ring coil applied to the connection of electromagnetic pulse power cable joints. Background Art

[0002] Electromagnetic pulse welding technology shows broad application prospects in the field of metal connection. It is based on pulse power technology and relies on an energy storage system to instantaneously release energy to generate a high-amplitude pulsed current. The pulsed current flows through the welding coil to generate a pulsed magnetic field. Under the action of electromagnetic induction, a high-intensity electromagnetic force is generated, which acts on the metal workpiece placed inside the coil to cause it to collide at high speed to form a connection. Electromagnetic pulse welding coils mostly adopt a closed design. In the actual engineering application process, the objects that can be processed by traditional closed coils are limited to regular cylindrical workpieces and the length of the workpieces is very limited. Otherwise, problems such as the workpiece being unable to be placed or unable to be taken out after welding will occur. Its engineering practicability is a major shortcoming in the application and popularization of this technology.

[0003] The power cable terminal joint consists of a regular cylindrical part and an irregular end. Usually, the width of the end is greater than the diameter of the joint. Therefore, after electromagnetic pulse welding is achieved, if the diameter of the magnetic concentrator is designed to be equivalent to the diameter of the cylinder, it is difficult to take out the joint; if the diameter of the magnetic concentrator is designed to be greater than the diameter of the cylinder, although the joint can be taken out, the electromagnetic coupling relationship between the magnetic concentrator and the workpiece is lost, and it is difficult to achieve a connection. Currently, electromagnetic pulse welding mostly requires the cooperation of a magnetic concentrator for welding. According to the magnetic concentrating principle of the magnetic concentrator, a gap needs to be preset between the inner and outer surfaces of the magnetic concentrator, resulting in deformation easily occurring at the gap on the inner surface of the magnetic concentrator. Therefore, the magnetic concentrator needs to be frequently replaced to ensure the connection quality of the welded joint, increasing the economic input required for welding. Summary of the Invention

[0004] The present invention intends to propose an opening and closing type ring coil applied to the connection of electromagnetic pulse power cable joints, which can solve the limitation problem of traditional closed coils in processing power cable joints and can also achieve electromagnetic pulse welding without the assistance of a magnetic concentrator.

[0005] For this purpose, the technical solution adopted by the present invention is as follows: an opening and closing type ring coil applied to the connection of electromagnetic pulse power cable joints, including two semi-circular ring coils arranged in central symmetry, with ports for accessing or connecting to an external power supply platform provided at both ends of each ring coil, and the ports accessed by the two ring coils are not adjacent. Each ring coil is arranged on a corresponding insulating ring, and a plug-in structure capable of combining the insulating rings is provided on the opposite surfaces of the two insulating rings.

[0006] Preferably, as in the above solution, a groove for installing the ring coil is provided on the insulating ring.

[0007] Further preferably, the cross-section of the toroidal coil is rectangular, and the corners are transitioned by rounded corners.

[0008] Further preferably, the toroidal coils are evenly arranged on the insulating ring.

[0009] Advantages of the present invention:

[0010] 1) The overall processing is simple and easy to produce, and the opening and closing state of the coil can be quickly changed during welding, thus solving the problem of processing limitations of traditional closed coils; at the same time, compared with the prior art in which two coils are directly arranged on both sides of the workpiece to be welded to facilitate the removal of the workpiece, in this application, the workpiece can be welded in a circle without rotating the workpiece during welding.

[0011] 2) The opening and closing type coil design requires dividing the coil along the axial direction of the flying tube. The winding method of this application makes the coil current flow along the axial direction of the flying tube, while the existing winding method makes the coil current flow along the circumferential direction of the flying tube. After the winding coil of this application is divided along the axial direction of the flying tube, it does not affect the continuous flow of the coil current, which is convenient for realizing the design of the opening and closing type structure of the coil.

[0012] 3) Traditional coils mostly need to be used in combination with a magnetic concentrator. The magnetic concentrator has a structure with a small outer and a large inner, which is convenient for concentrating electromagnetic energy. When winding the coil in this application, the winding method of sparse outside and dense inside is followed, which can also concentrate electromagnetic energy, and there is no need to use an additional magnetic concentrator, reducing the economic investment of the welding equipment. Description of the drawings

[0013] Figure 1 is a schematic diagram of the present invention.

[0014] Reference numerals: toroidal coil - 1, port - 2, insulating ring - 3. Detailed implementation manners

[0015] The present invention will be further described below through embodiments in conjunction with the drawings:

[0016] As Figure 1 shown, an opening and closing type toroidal coil applied to the connection of an electromagnetic pulse power cable joint mainly consists of two toroidal coils 1 that are centrosymmetrically arranged and semi-circular. At both ends of each toroidal coil 1, there are ports 2 connected to or disconnected from an external power supply platform, and the ports 2 connected to the two toroidal coils are not adjacent. At the same time, each toroidal coil 1 is arranged on a corresponding insulating ring 3, and the insulating ring is also semi-circular. An insertion structure capable of realizing the combination of the insulating rings is arranged on the opposite surfaces of the two insulating rings 3.

[0017] The toroidal coil is wound around a toroidal insulating ring, and during welding, the current flows along the axial direction of the flying tube. Since the connection directions of the two toroidal coils are opposite, according to the principle of electromagnetic induction, when welding the terminal joint of a power cable, an induced current in the opposite direction will be generated at the end. Under the action of the coil current, this induced current will generate an inward electromagnetic force on the end surface, driving the end to deform and collide with the cylinder to achieve electromagnetic pulse welding. Since the toroidal coil is wound around a toroidal insulating unit, the inner surface of the toroidal coil will be denser than the outer surface, making the induced current generated on the flying tube relatively dense, thus ensuring the welding quality. Of course, the split toroidal coil can also be used for welding of inner and outer tubes or a rod inside an outer tube.

[0018] To ensure that the toroidal coil can be stably arranged on the insulating ring, a groove 3a for installing the toroidal coil 1 is provided on the insulating ring 3. At the same time, the groove also ensures the insulation strength between the turns of the toroidal coil.

[0019] To ensure the uniformity of welding, the toroidal coil 1 is evenly arranged on the insulating ring 3. At the same time, to ensure the welding width, preferably, the cross-section of the toroidal coil 1 is set as a rectangle, so that the long side of the rectangle contacts the workpiece to be welded, and at the same time, the corners of the rectangle are transitioned by rounded corners to facilitate the protection of the toroidal coil.

[0020] The plug-in structure includes a groove and a protrusion provided on the end surface of the insulating ring. During welding, the two toroidal coils with insulating rings are respectively clamped by two clamping hands arranged opposite to each other left and right or up and down. Then, the two clamping hands move relatively. When the protrusion on the end surface of one insulating ring is inserted into the groove on the end surface of the other insulating ring, the assembly is achieved. Then, the workpiece is placed and powered on for welding. After welding is completed, the power is first cut off, and then the two clamping hands move away from each other, separating the two insulating rings, thus facilitating the removal of the welded workpiece. Among them, the structure of the clamping hand adopts the existing technology.

Claims

1. An open and close toroidal coil used for connecting electromagnetic pulse power cable joints, characterized in that: The invention comprises two annular coils (1) which are arranged in a centrally symmetrical manner and are in a semicircular shape. Ports (2) for connecting to or connecting to an external power supply platform are arranged at both ends of each annular coil (1), and the ports (2) connected to the two annular coils are not adjacent. Each annular coil (1) is arranged on a corresponding insulating ring (3), and a plug-in structure capable of realizing the combination of the insulating rings is arranged on the opposite surfaces of the two insulating rings (3).

2. The split-type toroidal coil for electromagnetic pulse power cable joint connection according to claim 1, characterized in that: The insulating ring (3) is provided with a groove (3a) for mounting the toroidal coil (1).

3. The split-type toroidal coil for electromagnetic pulse power cable joint connection according to claim 1, characterized in that: The cross section of the annular coil (1) is arranged to be rectangular, and the corners are transitioned through rounded corners.

4. The split-type toroidal coil for electromagnetic pulse power cable joint connection according to claim 1, characterized in that: The ring-shaped coil (1) is evenly arranged on the insulating ring (3).

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