Open-close type annular coil for electromagnetic pulse

Abstract

The utility model discloses an open-close type annular coil for electromagnetic pulse, 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 into or out of an external power supply platform, and the connected 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] This utility model belongs to the field of power cable welding technology, specifically relating to an openable ring coil for electromagnetic pulses. Background Technology

[0002] Electromagnetic pulse welding technology shows broad application prospects in the field of metal joining. Based on pulsed power technology, it relies on an energy storage system to release energy instantaneously, generating a high-amplitude pulsed current. This current flows through a welding coil, creating a pulsed magnetic field. Under electromagnetic induction, this generates a high-intensity electromagnetic force, which acts on the metal workpiece placed inside the coil, causing it to collide at high speed and form a connection. Electromagnetic pulse welding coils mostly employ a closed design. In practical engineering applications, traditional closed coils can only process regular cylindrical workpieces with very limited lengths. Otherwise, problems arise such as the workpiece being unable to be inserted or removed after welding. Its practical engineering applicability is a major bottleneck in the application and promotion of this technology.

[0003] Power cable termination joints consist of a regular cylindrical section and an irregular end, with the end width typically exceeding the joint diameter. Therefore, after electromagnetic pulse welding, if the magnet collector diameter is designed to be roughly equal to the cylinder diameter, the joint is difficult to remove; if the magnet collector diameter is larger, while removal is possible, the electromagnetic coupling between the magnet collector and the workpiece is compromised, making connection difficult. Currently, electromagnetic pulse welding often requires the use of a magnet collector. Based on the magnetizing principle, a gap needs to be pre-set between the inner and outer surfaces of the magnet collector, leading to potential deformation at the gap on the inner surface. Therefore, the magnet collector needs frequent replacement to ensure the quality of the welded joint, increasing the economic cost of welding. Utility Model Content

[0004] This utility model proposes an open-loop type coil for electromagnetic pulses, which solves the limitations of traditional closed coils in processing power cable joints, and also enables electromagnetic pulse welding without the aid of a magnet collector.

[0005] Therefore, the technical solution adopted by this utility model is as follows: an openable ring coil for electromagnetic pulses, comprising two ring coils arranged in a centrally symmetrical and semi-circular manner, each ring coil having ports at both ends for connection or connection to an external power supply platform, and the ports of the two ring coils being connected are not adjacent, each ring coil being mounted on a corresponding insulating ring, and the opposite surfaces of the two insulating rings having a plug-in structure that enables the combination of insulating rings.

[0006] As a preferred embodiment of the above scheme, the insulating ring is provided with a groove for mounting a circumferential coil.

[0007] Further preferably, the cross-section of the annular coil is set to rectangular, and the corners are rounded.

[0008] It is further preferred that the ring-shaped coils are evenly arranged on the insulating ring.

[0009] The beneficial effects of this utility model are:

[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 existing technology, which directly sets two coils on both sides of the workpiece to be welded to facilitate the removal of the workpiece, this application can complete one round of welding of the workpiece without rotating the workpiece during welding.

[0011] 2) The open-loop coil design requires dividing the coil along the axial direction of the fly tube. The winding method of this application allows the coil current to flow along the axial direction of the fly tube, while the existing winding method allows the coil current to flow circumferentially along the fly tube. The winding method of this application, after dividing the coil along the axial direction of the fly tube, does not affect the continuous flow of the coil current, which facilitates the implementation of the open-loop coil structure design.

[0012] 3) Traditional coils often require the use of a magnet collector, which has a small outer and large inner structure to facilitate the concentration of electromagnetic energy. This application follows a winding method of loose outer and tight inner coils, which can also achieve the concentration of electromagnetic energy without the need for an additional magnet collector, thus reducing the economic investment in welding equipment. Attached Figure Description

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

[0014] Attached diagram labels: loop coil-1, port-2, insulating ring-3. Detailed Implementation

[0015] The present invention will be further described below with reference to embodiments and accompanying drawings:

[0016] like Figure 1 As shown, an openable ring coil for electromagnetic pulses mainly consists of two semi-circular ring coils 1 arranged symmetrically at the center. Each ring coil 1 has a port 2 at both ends for connection to or connection to an external power supply platform. The ports 2 of the two ring coils are not adjacent. Each ring coil 1 is mounted on a corresponding insulating ring 3, which is also semi-circular. The two insulating rings 3 have a plug-in structure on their opposite surfaces that enables the combination of the insulating rings.

[0017] Because the two toroidal coils are connected in opposite directions, according to the principle of electromagnetic induction, an induced current in the opposite direction will be generated at the end when welding the power cable terminal joint. This induced current, influenced by the coil current, will generate an inward electromagnetic force on the end surface, driving the end to deform and collide with the cylinder, thus achieving electromagnetic pulse welding. Since the toroidal coil is wound on the insulating unit, the inner surface of the toroidal coil will be denser than the outer surface, resulting in a relatively denser induced current generated on the tube, thus ensuring welding quality. Of course, the openable toroidal coil can also be used for welding inner and outer tubes or inner bars of outer tubes.

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

[0019] To ensure uniform welding, the ring coils 1 are evenly distributed on the insulating rings 3. To ensure the width of the weld, it is best to make the cross-section of the ring coil 1 rectangular, so that the long side of the rectangle contacts the welded part, and the corners of the rectangle are rounded to protect the ring coil.

[0020] The insertion structure includes a groove and a protrusion on the end face of the insulating ring. During welding, two circumferential coils with insulating rings are respectively clamped by two grippers positioned opposite each other, either left and right or top and bottom. The two grippers then move relative to each other, causing the protrusion on one end face of the insulating ring to insert into the groove on the end face of the other insulating ring, thus achieving assembly. The workpiece is then placed in and energized for welding. After welding, the power is first turned off, and then the two grippers move back to back, separating the two insulating rings and facilitating the removal of the welded workpiece. The gripper structure utilizes existing technology.

Claims

1. A type of openable toroidal coil for electromagnetic pulses, characterized in that: It includes two centrally symmetrical and semi-circular ring coils (1). Each ring coil (1) has a port (2) at both ends for connecting to or connecting to an external power supply platform. The ports (2) of the two ring coils are not adjacent. Each ring coil (1) is set on a corresponding insulating ring (3). The two insulating rings (3) have a plug-in structure on their opposite surfaces that can realize the combination of insulating rings.

2. The opening and closing toroidal coil for electromagnetic pulses according to claim 1, characterized in that: The insulating ring (3) is provided with a groove (3a) for mounting the circumferential coil (1).

3. The openable toroidal coil for electromagnetic pulses according to claim 1, characterized in that: The cross-section of the loop coil (1) is set to a rectangle, and the corners are rounded.

4. The openable toroidal coil for electromagnetic pulses according to claim 1, characterized in that: The ring coil (1) is evenly arranged on the insulating ring (3).

Images