Safe and reliable cable head grounding wire

Abstract

The utility model relates to a safe and reliable cable head grounding wire, which comprises a fixed end, a movable end and a grounding wire, the fixed end comprises a first insulating handle and a crimping sleeve, one end of the first insulating handle is inwards provided with a threaded connection port, the crimping sleeve is arranged in the first insulating handle and is integrally formed with the first insulating handle, and one end of the crimping sleeve is communicated with the threaded connection port; the movable end comprises a second insulating handle and a screw rod, the screw rod is axially arranged on the second insulating handle, the end part of the screw rod penetrates out of the second insulating handle, and the end part of the screw rod is matched with the threaded connection port; and one end of the grounding wire is arranged in the first insulating handle, so that the problem that a metal part is too long and is easy to break when a traditional grounding wire uses a single-hole terminal and a double-hole terminal can be solved, and meanwhile, the potential safety hazard caused by exposure of a terminal hole is avoided.

Description

Technical Field

[0001] This utility model relates to a safe and reliable cable head grounding wire, belonging to the field of wire clamp technology. Background Technology

[0002] In the daily operation and maintenance of 10kV three-phase three-wire power systems, the grounding wire is a core piece of equipment ensuring the safety of workers. During power construction, the safety of cable testing and related operations cannot be ignored. According to the "State Grid Corporation of China Power Safety Work Regulations (Substation Section)," after cable testing, the tested cable must be fully discharged, and a temporary grounding wire must be installed until the cable tail wire is connected before it can be removed.

[0003] However, numerous problems exist in actual operation. For example, during routine power grid maintenance, it is common for temporary grounding wires to be left uninstalled after cable testing and discharge, a violation frequently seen in cable construction. Furthermore, field surveys have revealed several deficiencies in existing grounding methods. For instance, T-shaped cable heads are difficult to ground; when using personal safety wires as temporary grounding wires, the grounding wires are not securely fixed, and their cross-sectional area often fails to meet standard requirements. These problems seriously threaten the personal safety of workers. Therefore, developing a safe, reliable, and easy-to-use cable head grounding clamp has become an urgent priority. Utility Model Content

[0004] In order to solve the above-mentioned problems in the existing technology, this utility model provides a safe and reliable cable head grounding wire, which can solve the problem that the metal part is too long and easily breaks when using single-hole terminals or double-hole terminals in traditional grounding wires, and at the same time avoid the safety hazards caused by exposed terminal holes.

[0005] The technical solution of this utility model is as follows:

[0006] A safe and reliable cable head grounding wire includes a fixed end, a movable end, and a grounding wire. The fixed end includes a first insulating handle and a crimping sleeve. One end of the first insulating handle has an inwardly threaded connection port. The crimping sleeve is disposed inside the first insulating handle and integrally formed with the first insulating handle. One end of the crimping sleeve communicates with the threaded connection port. The movable end includes a second insulating handle and a screw. The screw is axially disposed on the second insulating handle, and the end of the screw protrudes from the second insulating handle. The end of the screw matches the threaded connection port. One end of the grounding wire is disposed inside the first insulating handle.

[0007] The first and second insulating handles have deeply recessed anti-slip textures on their surfaces, and the direction of the anti-slip textures is perpendicular to the rotation direction of the movable end.

[0008] The crimped sleeve has a spiral guide groove inside, and the depth of the guide groove is 1 / 3 of the sleeve wall thickness; the conductor end of the grounding wire forms a protrusion structure that matches the guide groove after crimping.

[0009] The screw has a circumferentially arranged limiting groove at the end of the threaded section, and a recessed groove is provided on the inner wall of the second insulating handle at the corresponding position. A ball is connected to the recessed groove by a spring.

[0010] This utility model has the following beneficial effects:

[0011] This invention achieves a fully enclosed crimping and feedback-enabled threaded connection for the grounding wire through the combination of an integrated crimping sleeve at the fixed end and a limiting screw structure at the movable end. Utilizing the mechanical interlocking design of the spiral guide groove and the crimping protrusion, it enhances tensile strength and torsional resistance. Ultimately, this results in a grounding connection device that combines electrical safety and operational reliability, effectively solving the problem of excessively long and easily broken metal parts in traditional grounding wires using single-hole or double-hole terminals, while also avoiding the safety hazards caused by exposed terminal holes. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the fixed end structure of this utility model;

[0013] Figure 2 This is a half-sectional view of the movable end of this utility model;

[0014] Figure 3 This is a schematic diagram of the overall structure of this utility model.

[0015] The reference numerals in the figure are as follows:

[0016] 1. Fixed end; 2. Movable end; 3. Grounding wire; 11. First insulating handle; 12. Crimping sleeve; 13. Threaded connection port; 14. Guide groove; 21. Second insulating handle; 22. Screw; 23. Limiting groove; 24. Recessed groove; 25. Spring; 26. Ball bearing. Detailed Implementation

[0017] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0018] Please see Figures 1 to 3 The utility model provides a technical solution:

[0019] A safe and reliable cable head grounding wire includes a movable end 1, a fixed end 2, and a grounding wire 3. The movable end 1 includes a first insulating handle 11 and a crimping sleeve 12. One end of the first insulating handle 11 is provided with a threaded connection port 13. The crimping sleeve 12 is disposed inside the first insulating handle 11 and is integrally formed with the first insulating handle 11. One end of the crimping sleeve 12 communicates with the threaded connection port 13. The fixed end 2 includes a second insulating handle 21 and a screw 22. The screw 22 is axially disposed on the second insulating handle 21, and the end of the screw 22 extends out of the second insulating handle 21. The end of the screw 22 matches the threaded connection port 13. One end of the grounding wire 3 is disposed inside the first insulating handle 11.

[0020] Specifically, the first insulating handle 11 is made of epoxy resin and glass fiber composite injection molding, and the internal crimping sleeve 12 is made of copper. The end of the first insulating handle 11 is designed with a flared wire outlet, through which the grounding wire 3 is led out after passing through the crimping sleeve 12. A silicone sealing ring is provided on the inner wall of the wire outlet to prevent moisture intrusion.

[0021] The grounding wires 3 are crimped together using an integrated crimping sleeve 12 and an internal crimping method. After crimping, the grounding wires 3 are led out through the tail of the first insulating handle 11, which effectively solves the problem that the metal part of the traditional grounding wire is too long and easily breaks when using single-hole terminals or double-hole terminals, and at the same time avoids the safety hazards caused by exposed terminal holes.

[0022] It can meet the grounding requirements of different types of cable heads, whether they are specially structured T-type cable heads or other complex cable heads, and can achieve reliable grounding. Furthermore, it is suitable for all power transmission, transformation, and distribution disciplines and can be widely used in various power construction scenarios.

[0023] The surfaces of the first insulating handle 11 and the second insulating handle 21 are provided with deeply recessed anti-slip textures, and the direction of the anti-slip textures is perpendicular to the rotation direction of the fixed end 2.

[0024] The crimped sleeve 12 has a spiral-shaped guide groove 14 inside, the depth of which is 1 / 3 of the sleeve wall thickness. After crimping, the conductor end of the grounding wire 3 forms a protruding structure that matches the guide groove 14. The design of the spiral-shaped guide groove 14 causes the grounding wire 3 to undergo directional plastic deformation during the crimping process, forcing the metal material into the guide groove 14 to form a spiral protruding structure that matches the guide groove 14. This mechanical interlocking mechanism can achieve the effects of improved pull-out resistance and optimized torsional resistance.

[0025] The threaded end of the screw 22 is provided with a limiting groove 23 in a circumferential array, and the inner wall of the second insulating handle 21 is provided with a recessed groove 24 at the corresponding position. A ball 26 is connected inside the recessed groove 24 by a spring 25. When the screw 22 is screwed in to the set depth, the spring force of the spring 25 pushes the ball 26 into the limiting groove 23, producing a clear tactile feedback. Specifically, when the screw 22 is first screwed in, the operator rotates the second insulating handle 21, and the screw 22 is gradually screwed into the threaded connection 13. At this time, the ball 26 is pushed out by the spring 25, but has not yet contacted the limiting groove 23. Then, when the screw 22 is still 2-3 turns away from being fully screwed in, the ball 26 gets stuck in the limiting groove 23 and makes an audible prompt, and the resistance to rotating the second insulating handle 21 suddenly increases. The operator needs to continue rotating with a little force so that the ball 26 is pressed back into the recessed groove 24, and the limiting groove 23 slides past the position of the ball 26, indicating that the screw 22 is in full contact with the cable head, forming a reliable ground. It can naturally guide the correct operation through touch, sound and sight, so that even inexperienced workers can correctly install the grounding wire and avoid electric shock accidents.

[0026] First, the conductor end of the grounding wire 3 is inserted into the crimping sleeve 12 of the movable end 1 to complete the crimping, so that the conductor end and the spiral guide groove 14 form a mechanical interlock. Then, the screw 22 of the fixed end 2 is aligned with the threaded connection port 13 of the movable end 1, and the second insulating handle 21 is rotated to screw the screw 22 into the threaded connection port 13. The screw 22 end is brought into close contact with the cable head by the thread pushing force. When the screw 22 is screwed into the limiting groove 23 and contacts the ball 26, a tactile feedback is generated to indicate to the operator that a reliable connection has been completed. At this time, the grounding wire 3 forms a fully enclosed conductive path with the movable end 1 through the integrally formed crimping sleeve 12, and finally realizes the safe grounding of the cable head.

[0027] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A secure and reliable cable head ground, characterized by: It includes a movable end (1), a fixed end (2), and a grounding wire (3); the movable end (1) includes a first insulating handle (11) and a crimping sleeve (12), one end of the first insulating handle (11) is provided with a threaded connection port (13) facing inward, the crimping sleeve (12) is disposed inside the first insulating handle (11) and is integrally formed with the first insulating handle (11), one end of the crimping sleeve (12) is connected to the threaded connection port (13); the fixed end (2) includes a second insulating handle (21) and a screw (22), the screw (22) is axially disposed on the second insulating handle (21), and the end of the screw (22) extends out of the second insulating handle (21), the end of the screw (22) matches the threaded connection port (13); one end of the grounding wire (3) is disposed inside the first insulating handle (11).

2. A secure and reliable cable head ground as defined in claim 1, wherein: The first insulating handle (11) and the second insulating handle (21) have deeply recessed anti-slip textures on their surfaces, and the direction of the anti-slip textures is perpendicular to the rotation direction of the fixed end (2).

3. A secure and reliable cable head ground as defined in claim 1, wherein: The inside of the crimped sleeve (12) is provided with a spiral guide groove (14), the depth of which is 1 / 3 of the sleeve wall thickness; the conductor end of the grounding wire (3) is crimped to form a protrusion structure that matches the guide groove (14).

4. A secure and reliable cable head ground as defined in Claim 1, wherein: The screw (22) has a limiting groove (23) arranged in a circumferential array at the end of the threaded section, and the inner wall of the second insulating handle (21) has a recessed groove (24) at the corresponding position. A ball (26) is connected inside the recessed groove (24) by a spring (25).

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