Detachable electromagnetic pulse welding device for cable copper nose crimping

Abstract

The invention discloses a detachable electromagnetic pulse welding device for cable copper nose crimping, which belongs to the technical field of electromagnetic pulse welding and comprises a detachable magnetic collector, a forming coil, a magnet sleeve, a fixing cover plate, a fixing bolt, a cable inner conductor and a cable copper nose. The detachable magnetic collector is composed of two magnetic collection modules, each magnetic collection module is composed of an inner surface, an outer surface, a connecting face and a through hole, the length of the inner surface is smaller than that of the outer surface, the inner surface and the outer surface are connected through the connecting face, and the connecting face is in a T shape. Compared with a common magnetic collector with a slit, the detachable magnetic collector has the advantage of being detachable, and the problem that a copper nose cannot be smoothly taken out after crimping is completed can be solved. The magnetic collector and the forming coil are separated through the magnet sleeve, and the magnetic collector has the advantages that the magnetic collector is convenient to replace, and insulation can be protected when the magnetic collector is replaced.

Description

Technical Field

[0001] The invention belongs to the technical field of electromagnetic pulse welding, and more specifically, relates to a detachable electromagnetic pulse welding device for crimping cable copper noses. Background Art

[0002] Electromagnetic pulse welding is a new type of non-thermal welding technology that uses high-voltage electromagnetic pulses to impact the joints of two metal sheets to achieve welding. With the help of short-term high-energy electromagnetic pulses, a high-speed impact effect can be produced in a very short time, thereby forming a shock wave, causing the contact surface of the metal to undergo a large degree of plastic deformation due to external force, and finally achieving metal connection.

[0003] In the prior art, the shape of the magnetic collector is approximately a solid cylinder with an opening, such as Figure 1 As shown in the figure, the main working parts are the inner and outer surfaces of the magnetism collector and the magnetism collector slit, and the length of the outer surface is greater than the length of the inner surface. Figure 2 As shown in the current flow direction, when the induced current appears on the outer surface of the magnetic collector, the induced current flows along the slit to the inner surface. Since the outer surface area is larger than the inner surface area, the current density on the inner surface is increased, and the induced magnetic field strength is therefore increased, achieving the effect of "magnetic collection".

[0004] Electromagnetic pulse welding technology can be applied to the crimping process of cable core wires and metal pipes, and can effectively improve the material morphology of the contact surface and the contact resistance of the joint. However, there are few reports on the electromagnetic pulse welding of copper noses. Copper noses have a unique geometric structure, such as Figure 3 As shown in the figure, it is divided into two parts: the fixing screw edge and the copper tube, where the width of the fixing screw edge is slightly larger than the diameter of the copper tube. In the process of electromagnetic pulse welding, in order to generate a strong magnetic field, the aperture of the magnetic collector is usually not too large. If a common magnetic collector with a slit is used for electromagnetic pulse welding of the copper nose, the fixing screw edge of the copper nose will not be able to pass through the aperture of the magnetic collector after crimping, which will make it impossible to remove the copper nose smoothly.

[0005] When electromagnetic pulse welding is performed on different types of cable copper noses, the electromagnetic forming device and forming coil used remain unchanged, and usually only the magnetic collector needs to be replaced. When replacing the magnetic collector, it is necessary to remove the magnetic collector from the forming coil and rearrange the insulation between the magnetic collector and the forming coil. The operation is complicated and easily damages the insulation, which is not conducive to the same electromagnetic pulse forming device to process various types of weldments. Summary of the invention

[0006] In view of the above defects or improvement needs of the prior art, the present invention provides a detachable electromagnetic pulse welding device for crimping cable copper noses, thereby solving the technical problems in the prior art that the workpiece cannot be smoothly removed when electromagnetic pulse welding of the cable copper nose is performed with a single slit magnetic collector and that the insulation will be damaged when the magnetic collector is replaced.

[0007] To achieve the above object, according to one aspect of the present invention, a detachable electromagnetic pulse welding device for cable copper nose crimping is provided, comprising a detachable magnetic collector, a forming coil, a magnet sleeve and a fixing assembly;

[0008] The detachable magnetic collector is arranged inside the magnetic sleeve; the forming coil is wound around the outside of the magnetic sleeve, and the fixing assembly is arranged on the upper and lower surfaces of the magnetic sleeve;

[0009] The detachable magnetic collector comprises two magnetic collecting modules, each of which comprises an inner surface, an outer surface, a connecting surface and a through hole; the through hole is arranged along the axial direction of the magnetic collecting module, the axial length of the inner surface is less than the axial length of the outer surface, a connecting surface connecting the inner surface and the outer surface is arranged between the inner surfaces of the two magnetic collecting modules, the inner surfaces of the two magnetic collecting modules are combined to form a central hole of the detachable magnetic collector, and a slit is arranged at the adjacent connecting surfaces of the two magnetic collecting modules;

[0010] After a pulse current is passed through the forming coil, an induced current is generated on the outer surface of the detachable magnetic collector due to the discharge of the forming coil. The induced current flows to the inner surface through the slit and generates a magnetic field in the center hole. The cable copper nose in the center hole is deformed by the Lorentz force, thereby completing electromagnetic pulse welding of the cable copper nose and the inner conductor of the cable in the center hole.

[0011] Further preferably, the cable inner conductor and the cable copper nose are a specific type of coaxial cable inner conductor and a matching cable copper nose standard part.

[0012] Preferably, the connecting surface is T-shaped.

[0013] Preferably, the two magnetic collecting modules of the detachable magnetic collector are of different sizes.

[0014] Further preferably, the center angle of the circular arc on the inner surface of one magnetic collecting module is 90°, and the center angle of the circular arc on the inner surface of the other magnetic collecting module is 270°.

[0015] Preferably, the two magnetic collecting modules of the detachable magnetic collector are both made of copper material.

[0016] Further preferably, the length of the inner surface is 20 mm, the length of the outer surface is 120 mm, the thickness of the connecting surface is 50 mm, the diameter of the through hole is 10 mm; the diameter of the central hole forming the detachable magnetic collector is 28 mm.

[0017] Preferably, the shaped coil is wound by a single-strand copper wire.

[0018] Further preferably, the cross-sectional size of the copper wire is 4 mm×8 mm, the number of layers of the formed coil is 1, the number of turns is 24, and the turn spacing is 0.8 mm.

[0019] Preferably, the magnet sleeve is made of epoxy resin material.

[0020] Further preferably, the inner diameter of the magnet sleeve is 130 mm, the outer diameter is 140 mm, and the length is 120 mm.

[0021] Preferably, the fixing assembly includes a fixing cover plate and fixing bolts, and the fixing cover plates are respectively arranged on the upper and lower surfaces of the magnetic collecting sleeve. A cover plate center hole for placing the cable copper nose and the inner conductor of the cable is provided in the center of the fixed cover plate, and cover plate through holes corresponding to the through holes of the detachable magnetic collector are distributed around the cover plate center hole; the fixing bolts respectively pass through the cover plate through holes and the through holes of the detachable magnetic collector to fix the fixed cover plate to the upper and lower surfaces of the magnetic collecting sleeve.

[0022] Preferably, the fixed cover plate is made of epoxy resin material.

[0023] Further preferably, the inner diameter of the fixed cover plate is 50 mm, the outer diameter is 200 mm, and the length is 10 mm.

[0024] Preferably, the fixing bolts are standard bolts matching the through holes of the fixing cover plate.

[0025] In general, the above technical solutions conceived by the present invention can achieve the following beneficial effects compared with the prior art:

[0026] 1. The detachable electromagnetic pulse welding device for crimping cable copper noses proposed in the present invention divides the magnetism collector into two independent magnetism collecting modules by designing a detachable magnetism collector. The two magnetism collecting modules do not contact each other and there are two slits between the two magnetism collecting modules. Compared with the common magnetism collector with one slit, the device has the advantage of being detachable, which can solve the problem that the copper nose cannot be removed smoothly after crimping is completed.

[0027] 2. The detachable electromagnetic pulse welding device for cable copper nose crimping proposed by the present invention uses a magnetic sleeve to separate the magnetic collector from the forming coil. The forming coil is wound on the magnetic sleeve. When the magnetic collector is replaced, the forming coil and the insulation will not be damaged. The magnetic collector is easy to replace and the insulation can be protected when the magnetic collector is replaced. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural schematic diagram of a magnetic collector in the prior art;

[0029] Figure 2 It is a current streamline diagram of the inner and outer surfaces of the magnetic collector in the prior art;

[0030] Figure 3 This is a schematic diagram of the structure of the cable copper nose;

[0031] Figure 4 It is a structural cross-sectional view of a detachable electromagnetic pulse welding device for crimping cable copper noses of the present invention;

[0032] Figure 5 It is a structural schematic diagram of a detachable magnetic collector in a detachable electromagnetic pulse welding device for crimping a cable copper nose according to the present invention;

[0033] Figure 6 The present invention is a schematic structural diagram of a magnetic collecting module in a detachable electromagnetic pulse welding device for crimping cable copper noses.

[0034] In all the drawings, the same figure numbers are used to represent the same elements or structures, among which: 1-removable magnetic collector; 1a-inner surface; 1b-outer surface; 1c-connecting surface; 1d-through hole; 2-center hole; 3-slit; 4-forming coil; 5-magnet sleeve; 6-fixing cover plate; 7-fixing bolt; 8-cable inner conductor; 9-cable copper nose. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0036] like Figure 4-6As shown, the present invention proposes a detachable electromagnetic pulse welding device for crimping cable copper noses, which includes a detachable magnetic collector 1, a forming coil 4, a magnet sleeve 5, a fixed cover plate 6, a fixing bolt 7, a cable inner conductor 8 and a cable copper nose 9. Specifically, the detachable magnetic collector 1 is composed of two magnetic collecting modules, each of which is composed of an inner surface 1a, an outer surface 1b, a connecting surface 1c and a through hole 1d, wherein the inner surface 1a is shorter than the outer surface 1b, and the inner surface 1a is connected to the outer surface 1b through the connecting surface 1c, and the shape of the connecting surface 1c is T-shaped. The inner surfaces 1a of the two magnetic collecting modules surround the cylindrical center hole 2 of the detachable magnetic collector 1, and a slit 3 is left between the connecting surface of one magnetic collecting module and the connecting surface of another magnetic collecting module.

[0037] To further illustrate, the sizes of the two magnetic collecting modules are not equal, the central angle of the arc on the inner surface of one magnetic collecting module is 90°, and the central angle of the arc on the inner surface of the other magnetic collecting module is 270°.

[0038] The technical solution of the present invention is further illustrated by specific embodiments below:

[0039] Take the electromagnetic pulse welding of the inner conductor of 240 coaxial cable and the matching copper nose as an example. The diameter of the inner conductor of this type of cable is 18.6mm, and the outer diameter of the matching copper nose is 26mm, which is slightly smaller than the cylindrical center hole of the detachable magnetic collector. The specific welding method is as follows:

[0040] S1, with the magnet sleeve 5 as the central axis, a single-strand copper wire is used to wind a forming coil 4 on its outer side, the number of coil layers is 1, the number of turns is 24, and the turn spacing is 0.8mm.

[0041] S2, the two magnetic collecting modules are enclosed into a detachable magnetic collecting device 1 and then placed into the interior of the magnetic sleeve 5, and fixed cover plates 6 are covered on both ends of the magnetic sleeve 5. The fixing bolts 7 pass through the small holes on the cover plates and the through holes 1d of the magnetic collecting modules to fix the entire device together.

[0042] S3, insert the cable inner conductor 8 and the cable copper nose 9 through the center hole of the cover plate from both ends, and insert the cable inner conductor 8 into the cable copper nose 9, and the two are located together in the cylindrical center hole of the magnetic collector.

[0043] S4, using an external circuit to discharge the forming coil 4, an induced current is generated on the outer surface of the detachable magnetic collector 1, and the induced current flows to the inner surface through the slit 3 of the detachable magnetic collector, generating a strong magnetic field in the center hole 2, completing the electromagnetic pulse welding of the inner conductor of the 240 coaxial cable and the matching cable copper nose.

[0044] S5, remove the fixing bolts 7 and the fixing cover plate 6, take out the detachable magnetic collector and the welded workpiece, separate the two magnetic collector modules, and successfully take out the inner conductor of the cable and the crimped copper nose.

[0045] S6, when performing electromagnetic pulse welding on another type of cable copper nose, it is only necessary to replace the required magnetic collecting module and repeat steps S2-S5 to complete the crimping of another type of cable copper nose.

[0046] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A detachable electromagnetic pulse welding device for crimping cable copper noses, characterized in that: It includes a detachable magnetic collector, a forming coil, a magnetic sleeve and a fixing assembly; The detachable magnetic collector is arranged inside the magnetic sleeve; the forming coil is wound around the outside of the magnetic sleeve, and the fixing assembly is arranged on the upper and lower surfaces of the magnetic sleeve; The detachable magnetic collector comprises two magnetic collecting modules, each of which comprises an inner surface, an outer surface, a connecting surface and a through hole; the through hole is arranged along the axial direction of the magnetic collecting module, the axial length of the inner surface is less than the axial length of the outer surface, a connecting surface connecting the inner surface and the outer surface is arranged between the inner surfaces of the two magnetic collecting modules, the inner surfaces of the two magnetic collecting modules are combined to form a central hole of the detachable magnetic collector, and a slit is arranged at the adjacent connecting surfaces of the two magnetic collecting modules; After a pulse current is passed through the forming coil, an induced current is generated on the outer surface of the detachable magnetic collector due to the discharge of the forming coil. The induced current flows to the inner surface through the slit and generates a magnetic field in the center hole. The cable copper nose in the center hole is deformed by the Lorentz force, thereby completing electromagnetic pulse welding of the cable copper nose and the inner conductor of the cable in the center hole.

2. A detachable electromagnetic pulse welding device for cable copper nose crimping according to claim 1, characterized in that: The two magnetic collecting modules of the detachable magnetic collecting device are of different sizes.

3. A detachable electromagnetic pulse welding device for cable copper nose crimping according to claim 1, characterized in that: The two magnetic collecting modules of the detachable magnetic collector are both made of copper material.

4. A detachable electromagnetic pulse welding device for cable copper nose crimping according to claim 1, characterized in that: The shaped coil is wound by using a single-strand copper wire.

5. A detachable electromagnetic pulse welding device for cable copper nose crimping according to claim 1, characterized in that: The magnet sleeve is made of epoxy resin material.

6. A detachable electromagnetic pulse welding device for cable copper nose crimping according to claim 1, characterized in that: The fixing assembly includes a fixing cover plate and fixing bolts. The fixing cover plates are respectively arranged on the upper and lower surfaces of the magnetic collecting sleeve. A cover plate center hole for placing the cable copper nose and the inner conductor of the cable is provided in the center of the fixing cover plate. Cover plate through holes corresponding to the through holes of the detachable magnetic collector are distributed around the cover plate center hole. The fixing bolts respectively pass through the cover plate through holes and the through holes of the detachable magnetic collector to fix the fixing cover plate to the upper and lower surfaces of the magnetic collecting sleeve.

7. A detachable electromagnetic pulse welding device for cable copper nose crimping according to claim 6, characterized in that: The fixed cover plate is made of epoxy resin material.

8. A detachable electromagnetic pulse welding device for cable copper nose crimping according to claim 7, characterized in that: The fixing bolts are standard bolts that match the through holes of the fixing cover plate.

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