Wire compression terminal for large cross-section aluminum alloy cables

Abstract

The utility model discloses a kind of press line terminals of large cross-section aluminum alloy cable, comprising: crimping body and wiring terminal, crimping body is formed with multiple crimping parts;The inside of crimping body is formed with the first cavity for the wiring terminal portion of cable insertion;The inner wall of first cavity is formed with the first tooth part for biting tightly cable in the position corresponding crimping part;The side of crimping body opposite to crimping part is formed with the limiting slot for limiting crimping body when crimping crimping body;The inner wall of first cavity is formed with the second tooth part for biting tightly cable in the position corresponding limiting slot。The crimping connection structure of the utility model provides the press line terminal of large cross-section aluminum alloy cable is more stable, and conductivity is also more stable.

Description

Technical Field

[0001] This utility model relates to the technical field of end connection terminals for cables, and specifically to a crimping terminal for a large cross-section aluminum alloy cable. Background Technology

[0002] With the surge in demand for lightweight, high-capacity power transmission in offshore / onshore wind power, photovoltaic power generation, and urban rail transit, aluminum alloy cables are gradually replacing copper cables due to their low density, low cost, and moderate conductivity. However, aluminum alloy surfaces readily form a 3–10 nm thick Al2O3 oxide film with high hardness and high resistivity, and large cross-section conductors (≥300 mm²) are susceptible to this problem. 2 The following common problems exist during crimping: Traditional hexagonal crimping dies only produce 6 linear indentations on the outer ring, with residual oxide film in the central area, incomplete punctures of the oxide film, high contact resistance, and excessive temperature rise; large cross-section conductors have high metal flow resistance, and when the crimping pliers are not heavy enough, operators often apply additional pressure, causing local over-pressure leading to strand breakage and a sudden drop in pull-out force; large cross-section cables have high rigidity and no pre-positioning structure, making crimping positioning difficult, and crimping misalignment may result in one side being crimped too deeply and the other side being loosely connected. Utility Model Content

[0003] This utility model provides a crimping terminal for large-section aluminum alloy cables to solve the aforementioned technical problems, specifically adopting the following technical solution: A crimping terminal for a large cross-section aluminum alloy cable includes: a crimping body and a terminal block. The crimping body has multiple crimping portions. A first cavity is formed inside the crimping body for inserting the terminal block of the cable. A first tooth is formed on the inner wall of the first cavity at a position corresponding to the crimping portion for gripping the cable. A limiting groove is formed on the side of the crimping body opposite to the crimping portion for limiting the crimping body during crimping. A second tooth is formed on the inner wall of the first cavity at a position corresponding to the limiting groove for gripping the cable.

[0004] Furthermore, a first adhesive reservoir for storing conductive paste is formed at the root of the tooth.

[0005] Furthermore, a second adhesive reservoir for storing conductive paste is formed at the root of the second tooth.

[0006] Furthermore, the crimping portion is formed with a limiting recess for positioning the crimping position during the crimping operation.

[0007] Furthermore, multiple limiting grooves are formed on the side of the crimping body opposite to the crimping part.

[0008] Furthermore, multiple limiting grooves correspond one-to-one with limiting recesses.

[0009] Furthermore, the limiting groove is a square recess, and the limiting recess is a circular recess; the width of the square recess extending along the axial direction of the pressing body is equal to the diameter of the circular recess.

[0010] Furthermore, an annular crimping portion is formed at the end of the crimping body away from the terminal to limit the relative position of the surface layer of the cable and the crimping body; a second cavity is formed inside the crimping portion; the inner diameter of the second cavity is larger than the inner diameter of the first cavity.

[0011] Furthermore, the pressure line section is a toothed ring.

[0012] Furthermore, the end of the toothed ring furthest from the terminal has a plug tip for assisting the toothed ring in inserting into the cable; the plug tip is conical.

[0013] The advantage of this utility model is that the crimping terminal of the large cross-section aluminum alloy cable is designed with a crimping part, a first tooth part, a limiting groove and a second tooth part, forming an integrated structure of "bidirectional tooth-limiting groove-crimping part". Under the operation of a handheld crimping pliers, the oxide film can be efficiently mechanically pierced and the crimping position can be automatically aligned. The multiple crimping parts can effectively disperse the cable stress, thereby improving the stability and conductivity of the crimping connection structure. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of a crimping terminal for a large cross-section aluminum alloy cable according to this utility model; Figure 2 This is another perspective schematic diagram of the crimping terminal of a large cross-section aluminum alloy cable according to this utility model; Figure 3 This is a partial sectional view of the crimping terminal of a large-section aluminum alloy cable according to this utility model; The large cross-section aluminum alloy cable includes a crimping terminal 10, a wiring terminal 11, a crimping body 12, a crimping part 121, a limiting recess 1211, a first cavity 122, a first tooth 123, a first adhesive groove 124, a limiting groove 125, a second tooth 126, a second adhesive groove 127, a crimping part 128, a second cavity 1281, and a plug tip 1282. Detailed Implementation

[0016] The embodiments of this application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0017] like Figures 1 to 3 The diagram shows a crimping terminal 10 for a large-section aluminum alloy cable, comprising a crimping body 12 and a terminal 11. The terminal 11 is located at one end of the crimping body for connection to an electrical structure, while the crimping body 12 is crimped onto the end of the cable for fixed connection. The crimping body 12 of this design has multiple crimping portions 121. A first cavity 122 is formed inside the crimping body 12 for insertion of the cable terminal 11. The inner wall of the first cavity 122 has first teeth 123 at positions corresponding to the crimping portions 121. These teeth 123 can grip the cable and efficiently pierce the oxide film of the aluminum alloy cable core. A limiting groove 125 is formed on the side of the crimping body 12 opposite to the crimping portions 121. The limiting groove 125 limits the crimping body 12 during crimping, thereby positioning the crimping body and preventing wire misalignment. The inner wall of the first cavity 122 has a second tooth 126 formed at the position corresponding to the limiting groove 125, which can further grip the cable.

[0018] Specifically, the crimping body 12 has two symmetrical crimping portions 121 on its outer periphery, and a limiting groove 125 is provided on the corresponding position on the back side opposite to the crimping portions 121. The crimping body 12 has a first cavity 122 for inserting the aluminum alloy wire core. The inner wall of the first cavity 122 has a first tooth 123 in the area corresponding to the crimping portion 121, and a second tooth 126 in the area corresponding to the limiting groove 125. Thus, during crimping, the central cylinder of the crimping die presses against the crimping portion 121 to form a hemispherical recess, while the limiting groove 125 engages with the die positioning boss to prevent radial slippage of the terminal. The bidirectional teeth in this technical solution pierce the oxide film from both radial and reverse directions during the two crimping processes, resulting in high piercing coverage and effectively reducing initial contact resistance. The limiting groove 125 and the die boss form a clearance fit, effectively reducing the crimping angle and completely solving the problem of "crimping deviation" in large-section cables.

[0019] Therefore, the crimping terminal 10 of the large cross-section aluminum alloy cable is designed with a crimping part 121, a first tooth part 123, a limiting groove 125, and a second tooth part 126, forming an integrated structure of "bidirectional tooth-limiting groove 125-crimping part 128". Under the operation of a handheld crimping pliers, the oxide film can be efficiently mechanically pierced, the crimping position can be automatically aligned, and the cable stress can be effectively dispersed through multiple crimping parts 121, thereby improving the stability and conductivity of the crimped connection structure.

[0020] In one specific implementation, a first adhesive groove 124 is formed at the root of the tooth portion 126 to store conductive paste, and a second adhesive groove 127 is formed at the root of the second tooth portion 126 to store conductive paste. Both adhesive grooves have a V-shaped cross-section. The amount of conductive paste pre-filled is quantitatively controlled by the volume of the adhesive grooves. During the pressing process, after the tooth tip pierces the oxide film, the conductive paste is squeezed and backfilled into the scratch, forming a "piercing-backfilling" closed loop, reducing the interfacial porosity and decreasing the partial discharge. The depth of the adhesive groove is less than 1 / 2 of the tooth height to ensure the hardness of the tooth tip, and the piercing ability is not affected by the grooving.

[0021] In one specific implementation, the crimping portion 121 forms a limiting recess 1211, which can be used to position the crimping position during the crimping operation.

[0022] Furthermore, a plurality of limiting grooves 125 are formed on the side of the crimping body 12 opposite to the crimping portion 121. Each limiting groove 125 corresponds one-to-one with a limiting recess 1211. The limiting grooves 125 are square recesses, and the limiting recesses 1211 are circular recesses, with the width of the square recess extending along the axial direction of the crimping body 12 equal to the diameter of the circular recess. Thus, during the crimping operation, the mold boss simultaneously falls into both the limiting recess 1211 and the limiting groove 125, forming a "dual-reference" positioning. The consistency of the crimping pit depth (CV value) is <2%. The combination of the circular recess and the square groove reduces the difficulty of mold processing and effectively extends the mold's service life. The edges of the crimping pit are rounded to avoid sharp-corner cracks and improve the terminal fatigue life.

[0023] In one specific implementation, an annular crimping portion 128 is formed at the end of the crimping body 12 away from the terminal 11. The crimping portion 128 is used to limit the relative position of the surface layer (protective layer) of the cable and the crimping body 12. A second cavity 1281 is formed inside the crimping portion 128, and the inner diameter of the second cavity 1281 is larger than the inner diameter of the first cavity 122.

[0024] Furthermore, the clamping part 128 is a toothed ring, which has a high clamping force. The end of the toothed ring away from the terminal 11 is formed with a plug tip 1282, which is conical and can be used to assist the toothed ring in inserting into the plug tip 1282 of the cable's protective layer.

[0025] In other words, the crimping body 12 integrally extends an annular crimping portion 128 from its tail end. A second cavity 1281 is formed within the crimping portion 128, with an inner diameter 0.8 mm larger than the inner diameter of the first cavity 122. The crimping portion 128 has a toothed ring structure, with a conical annular insertion tip 1282 at its end. This allows the toothed ring to pierce the semi-conductive layer outside the cable insulation shield, achieving electric field equalization and reducing the field strength concentration factor to 1.8. The second cavity 1281 (1281) forms a "stepped" transition, increasing the cable bending radius during bending and preventing shearing of the insulation layer. The cone angle of the insertion tip 1282 can be set to 30°, allowing for smooth insertion even with a field stripping length tolerance of ±2 mm for compatible cable models, improving construction efficiency by 40%.

[0026] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that the above embodiments do not limit this utility model in any way, and all technical solutions obtained by equivalent substitution or equivalent transformation fall within the protection scope of this utility model.

Claims

1. A crimping terminal for a large cross-section aluminum alloy cable, comprising: The crimping body and the terminal are characterized in that, The crimping body has multiple crimping portions; The crimping body has a first cavity inside for inserting the wire end of the cable; The inner wall of the first cavity has a first tooth for gripping the cable at the position corresponding to the crimping part; A limiting groove is formed on the side of the crimping body opposite to the crimping portion for limiting the crimping body when crimping the crimping body; The inner wall of the first cavity has a second tooth for gripping the cable at the position corresponding to the limiting groove.

2. The crimp terminal of the large cross-section aluminum alloy cable according to claim 1, characterized in that, A first adhesive reservoir for storing conductive paste is formed at the root of the tooth.

3. The crimp terminal of the large cross-section aluminum alloy cable according to claim 1, characterized in that, A second adhesive reservoir for storing conductive paste is formed at the root of the second tooth.

4. The crimp terminal of the large cross-section aluminum alloy cable according to claim 1, characterized in that, The crimping portion has a limiting recess for positioning the crimping position during the crimping operation.

5. The crimp terminal of the large cross-section aluminum alloy cable according to claim 4, characterized in that, The crimping body has a plurality of limiting grooves formed on the side opposite to the crimping portion.

6. The crimp terminal of the large cross-section aluminum alloy cable according to claim 5, characterized in that, Each of the aforementioned limiting grooves corresponds one-to-one with the aforementioned limiting recess.

7. The crimp terminal of the large cross-section aluminum alloy cable according to claim 6, characterized in that, The limiting groove is a square recess, and the limiting recess is a circular recess; the width of the square recess extending along the axial direction of the pressing body is equal to the diameter of the circular recess.

8. The crimp terminal of the large cross-section aluminum alloy cable according to claim 1, characterized in that, The end of the crimping body away from the terminal is formed with an annular crimping portion for limiting the relative position of the surface layer of the cable and the crimping body. A second cavity is formed inside the pressure line section; The inner diameter of the second cavity is larger than the inner diameter of the first cavity.

9. The crimp terminal of the large cross-section aluminum alloy cable according to claim 8, characterized in that, The pressure line section is a toothed ring.

10. The crimp terminal of the large cross-section aluminum alloy cable according to claim 9, characterized in that, The end of the toothed ring away from the terminal is formed with a plug tip for assisting the toothed ring in inserting into the cable; The insertion tip is conical.

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