Polygonal structure magnetic collector

Abstract

The utility model discloses a multi-edge structure magnetic collector, and belongs to the technical field of electromagnetic forming. According to the magnetic collector, the magnetic collector body of a hollow structure is adopted, the crimping area of the stranded wire and the outer pipe is located in the inner through hole of the magnetic collector body and forms the working area, and the distance increasing component used for increasing the distance between the outer pipe and the inner surface of the magnetic collector body is arranged in the working area and on the inner surface of the inner through hole; the arrangement of the distance increasing component can increase the distance between the outer pipe and the inner surface of the magnetic collector, thereby reducing the magnetic pressure on the outer pipe at the center, enabling the collision speeds of the outer pipe and the stranded wire in the axial direction to be the same, achieving the regulation and control of the axial stress and deformation speed of the outer pipe, improving the deformation uniformity of the outer pipe, and improving the production efficiency. The problem of strand breakage of the stranded wire caused by overhigh collision speed between the outer pipe at the center of the magnetic collector and the stranded wire is prevented, and the stability of the contact resistance of the cable joint is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of electromagnetic forming, and particularly relates to a multi-edge structure magnetic concentrator. Background Art

[0002] At present, hydraulic pliers are generally used for making cable joints. Limited by the shape of the mold, the joint crimping is not tight, and there will be springback between the joint and the cable core wire. Therefore, problems such as too large contact resistance of the joint, partial discharge damaging the insulation, and easy pulling off are likely to occur. Electromagnetic crimping is a metal processing technology that makes metal workpieces deform at high speed and achieve reliable connection through electromagnetic force. Its basic principle is: the pulse capacitor bank discharges the magnetic field coil to generate a pulse large current. Due to the effect of electromagnetic induction, induction eddy currents in opposite directions are generated inside the magnetic concentrator. Due to the existence of the gap in the magnetic concentrator, the eddy currents are forced to concentrate on the inner wall of the working area of the magnetic concentrator. At the same time, eddy currents opposite to the current of the magnetic concentrator are induced in the conductive workpiece to be processed; then the workpiece deforms at high speed and collides with the inner rod under the action of electromagnetic repulsion force, so that the outer tube and the inner rod are solid-phase connected; when it is applied to the crimping of cable conductor pipe fittings, because it provides non-contact circumferential uniform magnetic pressure, it can significantly improve the surface morphology, compaction density, contact resistance and tensile strength of the pipe fittings after crimping.

[0003] Since the electromagnetic forming device is relatively large in volume, in order to improve the energy utilization rate of the device, those skilled in the art reduce the length of the working area of the magnetic concentrator, thereby increasing the magnetic induction intensity on the surface of the outer tube and increasing the deformation speed of the outer tube; however, when the working area of the magnetic concentrator is short, due to the large magnetic pressure on the outer tube at the center of the magnetic concentrator, the collision speed between the outer tube and the stranded wire at the center is the largest, resulting in uneven deformation of the outer tube in the axial direction or even broken strands of the stranded wire.

[0004] It can be seen that for the cable joints made by using the existing magnetic concentrator with a short working area, the contact resistance value of the cable joints is relatively large and unstable, and the identity of the cable joints is poor. Content of the Utility Model

[0005] The utility model provides a multi-edge structure magnetic concentrator to solve the technical problems that for the cable joints made by using the existing magnetic concentrator with a short working area, the contact resistance value of the cable joints is relatively large and unstable, and the identity of the cable joints is poor.

[0006] In order to achieve the above purpose, the utility model adopts the following technical content:

[0007] A multi-edge structure magnetic concentrator includes a magnetic concentrator body; the magnetic concentrator body is a hollow structure, and the inner through hole of the magnetic concentrator body is used for inserting the stranded wire and the outer tube to be crimped.

[0008] The crimping area of the stranded wire and the outer tube is located in the inner through hole and forms a working area with the inner through hole;

[0009] The inner surface of the inner through hole is provided with a distance-increasing component; the distance-increasing component is located in the working area and is used to increase the distance between the outer tube and the inner surface of the magnetic collector body.

[0010] Further, the distance-increasing component adopts a groove, and the groove is opened on the inner surface of the inner through hole of the magnetic collector body.

[0011] Further, the longitudinal section of the magnetic collector body adopts a conical stepped shape; the inner through hole of the magnetic collector body adopts an upper and lower conical structure; a stranded wire concentric fixture for clamping the stranded wire and an outer tube concentric fixture for clamping the outer tube are arranged in the inner through hole of the magnetic collector body.

[0012] Further, the stranded wire concentric fixture and the outer tube concentric fixture are symmetrically arranged up and down.

[0013] Further, the stranded wire is concentric with the outer tube.

[0014] Further, a magnetic field coil is sleeved outside the magnetic collector body.

[0015] Further, both the magnetic collector body and the magnetic field coil are fixed by the clamping of the first pressing plate and the second pressing plate.

[0016] Further, the first pressing plate and the second pressing plate adopt a circular structure; the first pressing plate, the second pressing plate and the magnetic field coil have the same diameter.

[0017] Further, the working area includes an axial working area; the distance-increasing component is located at the center of the axial working area; the working area also includes a radial platform area; the length of the radial platform area is 5-10 times the skin depth of the discharge current.

[0018] Further, an acceleration gap is arranged between the stranded wire and the outer tube.

[0019] Compared with the prior art, the utility model has the following beneficial effects:

[0020] The utility model provides a multi-faceted structure magnetic collector. The magnetic collector adopts a magnetic collector body with a hollow structure. The crimping area of the stranded wire and the outer tube is located in the inner through hole of the magnetic collector body to form a working area. In the working area and on the inner surface of the inner through hole, a distance increasing component is arranged for increasing the distance between the outer tube and the inner surface of the magnetic collector body; the arrangement of the distance increasing component can increase the distance between the outer tube and the inner surface of the magnetic collector, thereby reducing the magnetic pressure on the outer tube at the center, making the collision speeds of the outer tube and the stranded wire in the axial direction the same, realizing the regulation of the axial force and deformation speed of the outer tube, thereby improving the uniformity of the outer tube deformation, preventing the problem of strand breakage of the stranded wire caused by too large collision speed between the outer tube and the stranded wire at the center of the magnetic collector, and improving the stability of the contact resistance of the cable joint.

[0021] Preferably, in the utility model, a groove is opened on the inner surface of the inner through hole of the magnetic collector body as the distance increasing component, increasing the distance between the outer tube and the inner surface of the magnetic collector body, thereby reducing the magnetic pressure on the outer tube at the center, making the collision speeds of the outer tube and the stranded wire in the axial direction the same, realizing the regulation of the axial force and deformation speed of the outer tube, and thus improving the uniformity of the outer tube deformation.

[0022] Preferably, in the utility model, the inner through hole of the magnetic collector body is designed with a conical stepped shape and upper and lower conical structures, and in cooperation with the stranded wire concentric clamp and the outer tube concentric clamp, the coaxiality and stability of the stranded wire and the outer tube during the crimping process are ensured, further improving the crimping quality and efficiency.

[0023] Preferably, in the utility model, the stranded wire concentric clamp and the outer tube concentric clamp are symmetrically arranged up and down, further strengthening the coaxiality control of the stranded wire and the outer tube during the crimping process, reducing deviations and errors, and ensuring the consistency and reliability of the crimping.

[0024] Preferably, in the utility model, a magnetic field coil sleeved outside the magnetic collector body can generate a strong magnetic field during the crimping process through the principle of electromagnetic induction, promoting the tight combination of the stranded wire and the outer tube and improving the crimping strength.

[0025] Further preferably, in the utility model, the magnetic collector body and the magnetic field coil are fixed by the clamping of the first pressing plate and the second pressing plate. This fixing method is simple and reliable, ensuring the stability and safety of each component during the crimping process.

[0026] Even more preferably, in the utility model, the first pressing plate, the second pressing plate and the magnetic field coil are designed with circular structures having equal diameters, which is not only beautiful and generous, but also enhances the overall stability and balance, helping to reduce vibration and deviation.

[0027] Preferably, in the present utility model, the working area includes an axial working area and a radial platform area. The axial working area is located at the center of the range extender component, which helps to concentrate and optimize the distribution of the electromagnetic field in the axial direction, improving the crimping efficiency and effect. The length of the radial platform area is much greater than the skin depth of the discharge current, which can prevent the current from spreading to the two tapered parts on both sides, helping to reduce the skin effect of the current on the surface of the magnetic collector, increasing the magnetic field strength inside the working area of the magnetic collector, and improving the energy utilization rate of the device.

[0028] Preferably, in the present utility model, an acceleration gap is provided between the stranded wire and the outer tube. The setting of the acceleration gap enables the outer tube to accelerate and collide with the stranded wire under the action of electromagnetic repulsion, which helps the connection between solid phases. Description of the Drawings

[0029] Figure 1 Structural diagram of a multi-faceted magnetic collector provided by an embodiment of the present utility model;

[0030] Figure 2 Schematic diagram of the current flow direction during the operation of a multi-faceted magnetic collector provided by an embodiment of the present utility model;

[0031] Figure 3 Side view of the structure of a multi-faceted magnetic collector provided by an embodiment of the present utility model;

[0032] Figure 4 Schematic diagram of the force on the outer tube provided by an embodiment of the present utility model; wherein, (a) is the schematic diagram of the force on the outer tube under the action of a non-faceted magnetic collector; (b) is the schematic diagram of the force on the outer tube under the action of a multi-faceted magnetic collector;

[0033] Figure 5 Axial outer diameter of the cable joint provided by an embodiment of the present utility model; wherein, (a) is the schematic diagram of the axial outer diameter of the cable joint under the action of a non-faceted magnetic collector; (b) is the schematic diagram of the axial outer diameter of the cable joint under the action of a multi-faceted magnetic collector;

[0034] Figure 6 Contact resistance of the cable joint provided by an embodiment of the present utility model; wherein, (a) is the schematic diagram of the contact resistance of the cable joint under the action of a non-faceted magnetic collector; (b) is the schematic diagram of the contact resistance of the cable joint under the action of a multi-faceted magnetic collector.

[0035] Reference Signs:

[0036] 1 - magnetic field coil; 2 - magnetic collector body; 3 - working area; 4 - groove; 5 - stranded wire; 6 - outer tube; 7 - first pressing plate; 8 - second pressing plate; 9 - stranded wire concentric fixture; 10 - outer tube concentric fixture; 11 - stud. Detailed Embodiment

[0037] In order to make the technical problems, technical solutions and beneficial effects solved by the present utility model clearer and more understandable, the following specific embodiments are used to further elaborate on the present utility model in detail. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0038] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. Usually, the components of the embodiments of the present utility model described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0039] Therefore, the detailed description of the embodiments of the present utility model provided in the accompanying drawings is not intended to limit the scope of the claimed present utility model, but merely represents the selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts fall within the scope of protection of the present utility model.

[0040] It should be noted that similar reference numerals and letters indicate similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0041] In the description of the embodiments of the present utility model, it should be noted that if terms such as "upper", "lower", "horizontal", "inner", etc. are used to indicate the orientation or positional relationship, it is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the present utility model is usually placed during use. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present utility model. In addition, terms such as "first", "second", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0042] In addition, if the term "horizontal" appears, it does not mean that the component is required to be absolutely horizontal, but it can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but it can be slightly inclined.

[0043] In the description of the embodiments of the present utility model, it should also be noted that unless otherwise clearly specified and defined, if the terms "set", "installed", "connected", and "connected" are used, they should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0044] The following further describes the present utility model in detail with reference to the accompanying drawings:

[0045] Embodiment 1

[0046] As mentioned in the background art, since the electromagnetic forming device is relatively large, in order to improve the energy utilization rate of the device, those skilled in the art reduce the length of the working area of the magnetic collector, thereby increasing the magnetic induction intensity on the surface of the outer tube and increasing the deformation speed of the outer tube. However, when the working area of the magnetic collector is short, due to the large magnetic pressure on the outer tube at the center of the magnetic collector, the collision speed between the outer tube and the stranded wire at the center is the largest, resulting in uneven deformation of the outer tube in the axial direction or even broken strands of the stranded wire.

[0047] To solve the above problems, this embodiment provides a multi-faceted magnetic collector. By setting a groove at the center of the working area of the magnetic collector, this multi-faceted magnetic collector realizes the regulation of the axial force and deformation speed of the outer tube, greatly improves the uniformity of the axial deformation of the outer tube, prevents the problem of broken strands of the stranded wire caused by excessive collision speed between the outer tube and the stranded wire at the center of the magnetic collector, and improves the stability of the contact resistance of the cable joint.

[0048] As Figure 1 and Figure 3 shown, this embodiment provides a multi-faceted magnetic collector, including a magnetic collector body 2. The magnetic collector body 2 is a hollow structure as a whole, and its longitudinal section is a conical stepped shape. The hollow structure is the inner through hole of the magnetic collector body 2. A stranded wire 5 and an outer tube to be crimped are inserted into the inner through hole. A magnetic field coil 1 is arranged outside the magnetic collector body 2. Through the principle of electromagnetic induction, a strong magnetic field can be generated during the crimping process to promote the tight combination of the stranded wire 5 and the outer tube 6 and improve the crimping strength. As Figure 3 shown, a first pressing plate 7 is arranged at the top of the magnetic collector body 2 and the magnetic field coil 1; a second pressing plate 8 is arranged at the bottom. The first pressing plate 7 and the second pressing plate 8 are fixed and clamped through a stud 1, thereby realizing the fixation of the magnetic collector body 2, the magnetic field coil 1, and the stranded wire concentric fixture 9 and the outer tube concentric fixture 10 located inside the magnetic collector body 2.

[0049] Among them, the above-mentioned inner through-hole is also conical as a whole, and a clamping assembly is provided therein, including a stranded wire concentric fixture 9 and an outer tube concentric fixture 10; wherein, the stranded wire concentric fixture 9 clamps the stranded wire 5, and the outer tube concentric fixture 10 clamps the outer tube 6; when crimping operation is required, one end of the stranded wire 5 is inserted into the joint of the outer tube 6 to form a crimping area, and the surrounding of the crimping area is the working area; the working area is stepped, including an axial working area and a radial platform area. Here, the length of the radial platform area is much larger than the skin depth of the discharge current, and the length of the radial platform area is 5-10 times the skin depth of the discharge current; thus preventing the current from spreading to the two tapered parts on both sides.

[0050] In this embodiment, a distance increasing component is arranged on the inner surface of the inner through-hole of the magnetic collector body 2. The distance increasing component is located in the working area 3 and is used to increase the distance between the outer tube 6 and the inner surface of the magnetic collector body 2; in this way, through the arrangement of the distance increasing component, the distance between the outer tube 6 and the inner surface of the magnetic collector body 2 can be increased, the magnetic pressure on the outer tube 6 at the center can be reduced, so that the collision speed of the outer tube 6 and the stranded wire 5 is the same axially, realizing the regulation of the axial force and deformation speed of the outer tube, thereby improving the uniformity of the deformation of the outer tube 6, preventing the problem of stranded wire breakage caused by the too large collision speed between the outer tube 6 and the stranded wire 5 at the center of the magnetic collector body 2, and improving the stability of the contact resistance of the cable joint.

[0051] As Figure 2 shown, Figure 2 It is a current flow diagram in the multi-faceted magnetic collector. The specific working principle is as follows: The magnetic field coil 1 discharges to generate a large pulsed current; due to the action of electromagnetic induction, induced eddy currents with opposite directions are generated inside the magnetic collector body 1. Due to the existence of the gap in the magnetic collector body 2, the eddy currents are forced to concentrate on the inner wall of the working area of the magnetic collector body 2; at the same time, eddy currents opposite to the current of the magnetic collector body 2 are induced in the conductive outer tube 6, and then the outer tube 6 undergoes high-speed deformation and collides with the stranded wire 5 under the action of electromagnetic repulsion, so that the outer tube 6 and the stranded wire 5 are solid-phase connected.

[0052] Embodiment 2

[0053] Again, as Figure 1 and Figure 3 shown, this embodiment provides another multi-faceted magnetic collector. Based on the same structure as that in Embodiment 1, on the basis of Embodiment 1, optimization and improvement are carried out. In this embodiment, the distance increasing component is formed by opening a groove on the inner surface of the inner through-hole of the magnetic collector body 2, that is, a groove is arranged at the center of the axial working area. By increasing the distance between the outer tube 6 and the inner surface of the magnetic collector body 2, the magnetic pressure on the outer tube 6 at the center is reduced, so that the collision speed of the outer tube 6 and the stranded wire 5 is the same axially, thereby improving the uniformity of the deformation of the outer tube 6.

[0054] In this embodiment, an acceleration gap is provided between the outer tube 6 and the stranded wire 5, so that the outer tube 6 is accelerated to collide with the stranded wire 5 under the action of the electromagnetic repulsive force, which is helpful for solid phase connection.

[0055] In this embodiment, the vertically symmetrical arrangement of the stranded wire concentric clamp 9 and the outer tube concentric clamp 10 further strengthens the coaxiality control of the stranded wire 5 and the outer tube 6 during the crimping process, reduces deviations and errors, and ensures the consistency and reliability of the crimping.

[0056] In this embodiment, the first pressure plate and the second pressure plate both adopt a circular structure, which further makes the diameters of the first pressure plate, the second pressure plate and the magnetic field coil equal, which is not only beautiful, but also enhances the overall stability and balance, and helps to reduce vibration and deviation; of course, the first pressure plate and the second pressure plate here can also adopt a square or other shaped structural design, and a circular or elliptical shape is the preferred option.

[0057] like Figures 4 to 6 As shown, specifically Figure 4 (a) Figure 4 (b); Figure 5 (a) Figure 5 (b); Figure 6 (a) Figure 6 As shown in (b), it can be seen that compared with the edgeless magnetic collector, the multi-faceted magnetic collector can realize the regulation of the axial force and deformation speed of the outer tube due to the setting of the groove 4, greatly improve the uniformity of the axial deformation of the outer tube, prevent the strand breakage problem caused by the excessive collision speed between the outer tube and the stranded wire at the center of the magnetic collector, and improve the stability of the contact resistance of the cable joint; the corresponding effects in terms of the surface morphology, compression density, contact resistance and tensile strength of the pipe after crimping are significantly improved.

[0058] In summary, the utility model provides a multi-faceted magnetic collector, which has the following advantages compared with the existing crimping device:

[0059] First, the hollow structure design effectively accommodates the stranded wire and the outer tube to be crimped, ensuring accurate positioning of the crimping area. The distance-increasing components (such as grooves) in the inner through-hole not only increase the distance between the outer tube and the magnetic collector body, optimizing the uniformity of the outer tube deformation; the conical stepped magnetic collector body and the inner through-hole design with upper and lower conical structures, in cooperation with the stranded wire concentric clamp and the outer tube concentric clamp, ensure the precise concentric positioning of the stranded wire and the outer tube, further improving the accuracy and stability of crimping. The sleeving of the magnetic field coil and the clamping and fixing method through the pressing plate not only enhance the strength of electromagnetic crimping, but also simplify the operation process and improve the operation efficiency; in particular, the design of the working area, including the division of the axial working area and the radial platform area, improves the magnetic field strength in the working area and the energy utilization rate of the device; overall, this multi-faceted structure magnetic collector has significant technical advantages and application value in improving the accuracy, efficiency and quality of electromagnetic crimping of cable joints.

[0060] The above embodiments are only one of the implementation manners capable of implementing the technical solution of the present invention. The scope of protection required by the present invention is not only limited by this embodiment, but also includes any changes, substitutions and other implementation manners that are easily conceivable by those skilled in the art within the technical scope disclosed by the present invention.

Claims

1. A multi-faceted magnetic collector, characterized in that: It comprises a magnetism collector body; the magnetism collector body (2) is a hollow structure, and the inner through hole of the magnetism collector body (2) is used for inserting the stranded wire (5) and the outer tube (6) to be crimped; The crimping area of ​​the stranded wire (5) and the outer tube (6) is located in the inner through hole and forms a working area (3) with the inner through hole; The inner surface of the inner through hole is provided with a distance increasing component; the distance increasing component is located in the working area (3) and is used to increase the distance between the outer tube (6) and the inner surface of the magnetic collector body (2).

2. A multi-faceted magnetic collector according to claim 1, characterized in that: The distance increasing component adopts a groove (4), and the groove (4) is opened on the inner surface of the inner through hole of the magnetic collector body (2).

3. A multi-faceted magnetic collector according to claim 1, characterized in that: The longitudinal section of the magnetism collector body (2) is in a conical stepped shape; the inner through hole of the magnetism collector body (2) is in an upper and lower conical structure; a stranded wire concentric clamp (9) for clamping the stranded wire (5) and an outer tube concentric clamp (10) for clamping the outer tube (6) are provided in the inner through hole of the magnetism collector body (2).

4. A multi-faceted magnetic collector according to claim 3, characterized in that: The stranded wire concentric clamp (9) and the outer tube concentric clamp (10) are arranged symmetrically in the upper and lower directions.

5. A multi-faceted magnetic collector according to claim 4, characterized in that: The stranded wire (5) is concentric with the outer tube (6).

6. The multi-faceted magnetic concentrator according to claim 1, characterized in that: The magnetic field coil (1) is sleeved on the outside of the magnetic collector body (2).

7. A multi-faceted magnetic concentrator according to claim 6, characterized in that: The magnetic collector body (2) and the magnetic field coil (1) are both fixed by clamping the first pressing plate (7) and the second pressing plate (8).

8. A multi-faceted magnetic concentrator according to claim 7, characterized in that: The first pressing plate (7) and the second pressing plate (8) have a circular structure; the first pressing plate (7), the second pressing plate (8) and the magnetic field coil (1) have the same diameter.

9. The multi-faceted magnetic concentrator according to claim 1, characterized in that: The working area (3) comprises an axial working area; the distance increasing component is located at the center of the axial working area; the working area (3) also comprises a radial platform area; the length of the radial platform area is 5-10 times the skin depth of the discharge current.

10. The multi-faceted magnetic concentrator according to claim 1, characterized in that: An acceleration gap is provided between the stranded wire (5) and the outer tube (6).

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