Cable terminal wiring terminal and connection method thereof

Abstract

The invention discloses a cable terminal wiring terminal. The cable terminal wiring terminal comprises a first connection fitting and a second connection fitting, one end of the first connecting fitting and one end of the second connecting fitting are tubular crimping parts for inserting and crimping a cable, and the other end of the first connecting fitting and the other end of the second connecting fitting are semi-cylindrical connecting parts with flat contact surfaces; the first connecting fitting and the second connecting fitting are mutually lapped and matched through respective semi-cylindrical connecting parts to form a complete columnar connecting body; the annular fastening assembly is arranged outside the columnar connecting body in a sleeving manner; the device is characterized in that the flat contact surfaces of the first connection fitting and the second connection fitting are respectively provided with ratchet structures which are engaged with each other; and the first connecting fitting and the second connecting fitting can realize step-by-step length adjustment within a preset range by changing the meshing position of the ratchet structure. The repair problem that the terminal cannot be manufactured again due to insufficient reserved length of the cable is effectively solved, and cable-replacement-free quick recovery is realized.

Description

Technical Field

[0001] This invention relates to the technical field of cable accessories, and in particular to a cable terminal block and its connection method. Background Technology

[0002] Existing medium and low voltage distribution networks widely use power cables for power supply. However, during long-term operation, the terminals (commonly known as lugs) of cable terminations are prone to failure or even burnout due to complex manufacturing processes or harsh operating environments. The current conventional approach to such failures is to cut off the burnt terminal along with the damaged portion of the cable and then remake the cable termination. However, this "cut-and-remake" method has significant limitations: if the available cable length is too short, or if the available length has been exhausted after multiple repairs, it will not meet the length requirements for remaking the termination. This forces repair personnel to either replace the entire cable or add intermediate joints, significantly increasing construction costs and severely prolonging power outage repair time, thus reducing power supply reliability.

[0003] Traditional cable terminals also have shortcomings in their structural design. On the one hand, their connection parts often use simple bolt lap joints or point contact forms, resulting in a small conductive contact area. During long-term operation, they are prone to overheating and arcing due to excessive contact resistance, and lack an effective anti-loosening mechanism. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is: the problem that the length of the reserved cable is insufficient due to the cutting off of the damaged part in the emergency repair of existing cable terminal head failures, and the terminal head cannot be remade.

[0005] The above-mentioned technical problems are solved by the following technical solution: This invention proposes a cable terminal block including a first connecting hardware and a second connecting hardware; one end of the first connecting hardware and one end of the second connecting hardware are tubular crimping parts for cable insertion and crimping, and the other end is a semi-cylindrical connecting part with a flat contact surface; the first connecting hardware and the second connecting hardware overlap and cooperate with each other through their respective semi-cylindrical connecting parts to form a complete cylindrical connecting body; an annular fastening assembly is sleeved on the outside of the cylindrical connecting body; the invention is characterized in that: the flat contact surfaces of the first connecting hardware and the second connecting hardware are respectively provided with mutually meshing ratchet structures; the first connecting hardware and the second connecting hardware can achieve step-by-step length adjustment within a preset range by changing the meshing position of the ratchet structures.

[0006] In a preferred embodiment of the cable terminal block of the present invention: the ratchet structure is a barbed sawtooth with a one-way anti-retraction function; the first connecting hardware and the second connecting hardware are subjected to a backward tensile force, and the barbed sawtooth locks together to prevent dislodgement.

[0007] In a preferred embodiment of the cable terminal block of the present invention: the annular fastening assembly includes a fixing ring and a fastening bolt disposed on the fixing ring.

[0008] In a preferred embodiment of the cable terminal block of the present invention: a plurality of positioning grooves are provided on the outer arc surface of the semi-cylindrical connector; the axial arrangement direction of the positioning grooves is consistent with the axial arrangement direction of the ratchet structure.

[0009] In a preferred embodiment of the cable terminal block of the present invention: the end of the fastening bolt is adapted to the positioning groove and can be embedded in the positioning groove when tightened.

[0010] In a preferred embodiment of the cable terminal block of the present invention: the fixing ring is an elliptical structure, and the fastening bolt is located at the vertex of one end of the major axis of the elliptical structure.

[0011] In a preferred embodiment of the cable terminal block of the present invention: the inner wall curvature at the other end vertex of the major axis of the elliptical structure is adapted to the outer wall curvature of the columnar connector.

[0012] In a preferred embodiment of the cable terminal block of the present invention: the adjustment distance of the preset range is 0 to 20 mm.

[0013] In a preferred embodiment of the cable terminal block of the present invention: the first connecting hardware is made of copper; the second connecting hardware includes a copper connecting section and an aluminum connecting section formed by friction welding.

[0014] The present invention also provides a connection method using the above-mentioned cable terminal block, comprising the following steps: stripping the insulation layer from the end of the cable to be connected and the end of the conductor respectively, inserting the conductor core into the tubular crimping part of the first connecting hardware and the second connecting hardware for crimping; adjusting the relative axial position of the first connecting hardware and the second connecting hardware according to the required connection length on site, so that the ratchet structure of the two is misaligned and engaged at the corresponding length position; fitting the annular fastening assembly onto the outside of the ratchet structure engagement area; tightening the fastening bolt on the annular fastening assembly so that the semi-cylindrical connection part of the two is tightly fitted; and performing insulation sealing treatment on the outside of the connection part.

[0015] The beneficial effects of this invention are as follows: This invention achieves step-by-step length adjustment within a preset range through a ratchet misalignment meshing structure, effectively solving the emergency repair problem of not being able to remake the terminal head due to insufficient cable reserved length, and realizing rapid restoration without cable replacement; combined with the embedded locking design of the barbed ratchet and the elliptical fixing ring, a mechanical self-locking anti-disengagement mechanism is formed, which significantly improves the stability of the connection. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments of the present invention will be briefly described below. Obviously, the drawings described below only relate to some embodiments of the present invention and are not intended to limit the present invention. Wherein: Figure 1 A schematic diagram of the overall structure of the cable terminal block is shown. Figure 2 A schematic diagram of the first connecting hardware structure of the cable terminal block is shown; Figure 3 A schematic diagram of the annular fastening assembly structure of the cable terminal block is shown. Figure 4 A front view of the overall structure of the cable terminal block is shown; Figure 5 The cable termination terminal is shown. Figure 4 Enlarged view of the structure at point B. Detailed Implementation

[0017] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0018] The terminology used in this invention is that which is currently widely used in the art in consideration of the function of the invention; however, these terms may vary according to the intent of those skilled in the art, precedent, or new technology in the art. Furthermore, specific terms may be chosen by the applicant, and in such cases, their detailed meanings will be described in the detailed description of the invention. Therefore, the terms used in this specification should not be construed as simple names, but rather based on their meanings and the overall description of the invention.

[0019] Example 1 Reference Figure 1-5This embodiment provides a cable terminal block, including a first connecting hardware 1 and a second connecting hardware 2; one end of the first connecting hardware 1 and one end of the second connecting hardware 2 are tubular crimping portions 3 for cable insertion and crimping, and the other end is a semi-cylindrical connecting portion 4 with a flat contact surface; the first connecting hardware 1 and the second connecting hardware 2 are interlocked through their respective semi-cylindrical connecting portions 4 to form a complete cylindrical connecting body 5; an annular fastening assembly 6 is sleeved on the outside of the cylindrical connecting body 5; the first connecting hardware 1 and the second connecting hardware 2 are respectively provided with mutually meshing ratchet structures 7 on their flat contact surfaces; the first connecting hardware 1 and the second connecting hardware 2 can achieve step-by-step length adjustment within a preset range by changing the meshing position of the ratchet structures 7. In this embodiment, a split structure design is adopted, and both the first connecting hardware 1 and the second connecting hardware 2 include a tubular crimping portion 3 and a semi-cylindrical connecting portion 4. The tubular crimping part 3 has a wall thickness of 3-5mm and a length of 50mm to ensure crimping strength and conductive area with the cable core. To address the problem of insufficient cable length in existing technologies leading to repair difficulties, this invention incorporates a continuously arranged ratchet structure 7 on the contact plane of the two semi-cylindrical connecting parts 4. This structure allows construction personnel to flexibly adjust the relative axial position of the two fittings (i.e., "misalignment") according to the actual cable damage length, achieving step-by-step length compensation adjustment. This avoids replacing the entire cable and improves repair efficiency.

[0020] The ratchet structure 7 is a barbed sawtooth with a one-way anti-retraction function; when the first connecting hardware 1 and the second connecting hardware 2 are subjected to a backward tensile force, the barbed sawtooth locks together to prevent disengagement. In this embodiment, the specific tooth shape design is not a typical symmetrical triangular sawtooth.

[0021] The annular fastening assembly 6 includes a fixing ring 61 and fastening bolts 62 disposed on the fixing ring 61. The outer arc surface of the semi-cylindrical connecting part 4 is provided with a plurality of positioning grooves 8; the axial arrangement direction of the positioning grooves 8 is consistent with the axial arrangement direction of the ratchet structure 7. In this embodiment, to facilitate the step-by-step adjustment of the internal ratchet, a row of positioning grooves 8 is machined axially on the outer surface of the semi-cylindrical part of the fitting. The spacing between the grooves on the outer surface must be consistent with the spacing of the internal ratchet. The advantage of this design is that no matter how many teeth the installer misaligns the internal ratchet (e.g., by 3 teeth), there will always be a corresponding positioning groove 8 on the outer surface within the locking range of the annular fastening assembly 6, ensuring the accuracy of the adjusted mechanical fit.

[0022] The end of the fastening bolt 62 is adapted to the positioning groove 8 and can be embedded into the positioning groove 8 when tightened. In this embodiment, the end of the fastening bolt 62 on the annular fastening assembly 6 is specially processed, with a shape resembling a conical tip or a flat-headed boss that matches the cross-sectional shape of the positioning groove 8. When the bolt is tightened, the bolt end physically embeds into the positioning groove 8. This not only provides radial clamping force but, more importantly, axial limiting force. Even under severe wind or vibration conditions, this embedded fit effectively prevents the retaining ring from sliding along the smooth hardware surface, constituting the "second anti-loosening mechanism" of this invention.

[0023] The fixing ring 61 has an elliptical structure, and the fastening bolt 62 is located at the vertex of one end of the major axis of the elliptical structure. In this embodiment, the fixing ring 61 is not a traditional perfect circle, but rather designed as an ellipse. The fastening bolt 62 is installed at the top of the major axis of the ellipse. This arrangement utilizes the spatial advantage along the major axis of the ellipse, reserving space for bolt extension and installation.

[0024] The curvature of the inner wall at the apex of the other end of the major axis of the elliptical structure matches the curvature of the outer wall of the columnar connector 5. In this embodiment, the inner diameter of the major axis of the fixing ring is set to 1.2 times or slightly larger than the diameter of the connector. With the bolts loose, there is a large gap between the fixing ring and the terminal block. This allows repair personnel to easily insert or move the fixing ring to the designated position, especially in scenarios with limited operating space, such as high-altitude live-line work, improving construction convenience. Although the overall shape is elliptical, the inner wall curvature at the non-bolt end of the major axis is machined to fit the outer surface of the cylindrical hardware. When the top bolt is pressed downwards, the bottom elliptical inner wall supports the back of the hardware like a "palm." This "top-down" opposing clamping fit avoids the rotation or uneven force distribution of the hardware that is easily caused by single-point contact of the circular ring, ensuring a tight press between the two semi-cylindrical hardware components and good contact of the conductive surfaces.

[0025] The adjustment range of the preset range is 0 to 20 mm.

[0026] The first connecting hardware 1 is made of copper; the second connecting hardware 2 includes a copper connecting section and an aluminum connecting section formed by friction welding. In this embodiment, the first connecting hardware 1 is made of pure copper to ensure conductivity with the copper cable.

[0027] The second connecting fitting 2 is manufactured using a copper-aluminum friction welding process. Its structure consists of copper at one end and aluminum at the other. Compared to simple alloy casting, friction welding can achieve atomic-level bonding, eliminating the formation of oxide layers on the contact surface and solving the problems of heat generation and high resistance when connecting dissimilar metals.

[0028] Example 2 A method for connecting cable terminal blocks includes: stripping the insulation layers from the ends of the cable and conductor to be connected; inserting the conductor cores into the tubular crimping portions 3 of the first connecting hardware 1 and the second connecting hardware 2 for crimping; adjusting the relative axial positions of the first connecting hardware 1 and the second connecting hardware 2 according to the required connection length on site, so that the ratchet structures 7 of the two are misaligned and engaged at corresponding length positions; fitting the annular fastening assembly 6 onto the outside of the engagement area of ​​the ratchet structure 7; tightening the fastening bolts 62 on the annular fastening assembly 6, so that the semi-cylindrical connecting portions 4 of the two are tightly fitted; and performing insulation sealing treatment on the outside of the connection part.

[0029] Finally, it should be noted that the methods and devices described in detail above are merely embodiments, and those skilled in the art can modify these embodiments in different ways as long as they do not depart from the scope of the present invention.

Claims

1. A cable terminal block, comprising a first connecting fitting (1) and a second connecting fitting (2); One end of the first connecting fitting (1) and one end of the second connecting fitting (2) are tubular crimping parts (3) for cable insertion and crimping, and the other end is a semi-cylindrical connecting part (4) with a flat contact surface. The first connecting fitting (1) and the second connecting fitting (2) are connected to each other through their respective semi-cylindrical connecting parts (4) to form a complete cylindrical connecting body (5). An annular fastening assembly (6) fitted onto the outside of the columnar connector (5); Its features are: The first connecting fitting (1) and the second connecting fitting (2) are respectively provided with interlocking ratchet structures (7) on their flat contact surfaces; The first connecting fitting (1) and the second connecting fitting (2) can achieve step-by-step length adjustment within a preset range by changing the meshing position of the ratchet structure (7).

2. The cable termination terminal according to claim 1, characterized in that: The ratchet structure (7) is a barbed serration with a one-way anti-reverse function; The first connecting fitting (1) and the second connecting fitting (2) are subjected to a backward tensile force, and the barbed serrations lock together to prevent them from coming out.

3. The cable termination terminal according to claim 1, characterized in that: The annular fastening assembly (6) includes a fixing ring (61) and fastening bolts (62) disposed on the fixing ring (61).

4. The cable termination terminal according to claim 3, characterized in that: The outer arc surface of the semi-cylindrical connecting part (4) is provided with several positioning grooves (8); The axial arrangement direction of the positioning groove (8) is consistent with the axial arrangement direction of the ratchet structure (7).

5. The cable termination terminal according to claim 4, characterized in that: The end of the fastening bolt (62) is adapted to the positioning groove (8) and can be tightened and embedded in the positioning groove (8).

6. The cable termination terminal according to claim 3, characterized in that: The fixing ring (61) is an elliptical structure, and the fastening bolt (62) is located at the vertex of one end of the major axis of the elliptical structure.

7. The cable termination terminal according to claim 6, characterized in that: The curvature of the inner wall at the other end of the major axis of the elliptical structure is adapted to the curvature of the outer wall of the columnar connector (5).

8. The cable termination terminal according to claim 1, characterized in that: The adjustment range of the preset range is 0 to 20 mm.

9. The cable termination terminal according to claim 1, characterized in that: The first connecting fitting (1) is made of copper. The second connecting fitting (2) includes a copper connecting section and an aluminum connecting section formed by friction welding.

10. A method for connecting cable terminal blocks, characterized in that, The cable termination terminal block according to any one of claims 1-9 further includes the following steps: Remove the insulation layer from the ends of the cable and the conductor to be connected, and insert the wire core into the tubular crimping part (3) of the first connecting hardware (1) and the second connecting hardware (2) for crimping; According to the required connection length on site, adjust the relative axial position of the first connecting hardware (1) and the second connecting hardware (2) so that the ratchet structure (7) of the two are misaligned and engaged at the corresponding length position; The annular fastening assembly (6) is fitted onto the outside of the meshing area of ​​the ratchet structure (7); Tighten the fastening bolts (62) on the ring fastening assembly (6) so that the semi-cylindrical connection (4) of the two fits tightly together; Insulate and seal the outside of the connection parts.

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