Single-lead down lead T-shaped wire clamp

Abstract

The invention discloses a T-shaped wire clamp for a single-wire downlead. The T-shaped wire clamp comprises a cross arm used for being electrically connected with a main cable and a supporting foot used for being electrically connected with a branch wire. The cross arm horizontally clamps a main cable, and the supporting legs vertically clamp a branch wire. The cross arm comprises an upper clamping plate and a lower clamping plate which are insulated; the upper clamping plate and the lower clamping plate clamp a main cable up and down and are locked through a bolt or a buckle structure; a T-shaped conductor is embedded in the lower clamping plate; the upper surface of the T-shaped conductor is provided with a concave cambered surface corresponding to the circumferential surface of the main cable; an arc-shaped strip conductive blade is arranged outside each of the two ends of the upper part of the T-shaped conductor; the front end of the arc-shaped strip conductive blade is provided with a cutting edge, and the rear end is provided with an insulating filler strip; through a series of optimization on the structural design, the safety and the convenience of pre-stripping-free live working are realized, and the electrical contact area and the contact stability are remarkably improved, so that the T-shaped wire clamp which is efficient and reliable and adapts to severe environments is provided for cable branch connection.

Description

Technical Field

[0001] The present invention belongs to the field of electric power engineering, and specifically relates to a single-conductor downlead T-type clamp. Background Art

[0002] Currently, in high-voltage cable or high-current transmission systems, it is often necessary to achieve efficient, reliable, and safe electrical connection between the main cable and the branch conductor. There are mainly two traditional techniques: one is the installation method of first stripping the outer insulation layer of the main cable and then making conductive contact; the other is the piercing connection technique, which realizes electrical contact with the cable core by penetrating the insulation layer of the main cable.

[0003] In the pre-stripping method, in order to ensure good electrical contact with the cable core, it is necessary to partially or completely remove the insulation layer of the main cable first. However, this method has several defects: firstly, the stripping operation usually needs to be carried out under live conditions, with significant safety risks such as electric shock and sparks; secondly, the cable core is easily mechanically damaged during the stripping process, and it is difficult to ensure the consistency of the stripping thickness and shape, which may lead to uneven contact surfaces, thereby causing unstable local contact resistance and heating problems; in addition, the exposed cable core is prone to oxidation or moisture absorption in a harsh environment, affecting the reliability and safety of long-term operation.

[0004] The piercing connection technique attempts to achieve electrical connection with the cable core by directly penetrating the insulation layer, avoiding the cumbersome process of pre-stripping. Although this method is relatively simple in operation, it also has significant problems of its own: due to the small area of the piercing point, the formed electrical contact surface is limited, resulting in a large contact resistance; at the same time, the piercing process is likely to cause significant mechanical damage to the cable core, and the piercing effect is prone to inconsistency under different cables or installation conditions, affecting the stability and repeatability of the electrical connection.

[0005] Therefore, the existing technologies still have deficiencies in aspects such as live installation, construction safety, mechanical and electrical performance, and long-term environmental adaptability. There is an urgent need for an improved cable connection technology that can eliminate the operation risks brought by pre-stripping and avoid problems such as poor electrical contact caused by the piercing technique. Summary of the Invention

[0006] The object of the present invention is to provide a single-conductor downlead T-type clamp. Through a series of optimizations in structural design, it not only realizes the safety and convenience of live operation without pre-stripping the belt, but also significantly improves the electrical contact area and contact stability, thereby providing an efficient, reliable, and harsh environment-adaptable T-type clamp for cable branch connection.

[0007] The technical solution adopted by the present invention is as follows: Single-conductor down-lead T-type wire clamp, comprising a cross arm for electrically connecting the main cable and a leg for electrically connecting the branch wire; the cross arm horizontally clamps the main cable, and the leg vertically clamps the branch wire; the cross arm includes an insulating upper clamping plate and a lower clamping plate; the upper clamping plate and the lower clamping plate clamp the main cable up and down and are locked by bolts or snap structures; a T-shaped conductor is embedded in the lower clamping plate; a concave arc surface is provided on the upper surface of the T-shaped conductor corresponding to the circumferential surface of the main cable; an arc-shaped long conductive blade is respectively arranged at both outer ends of the upper part of the T-shaped conductor; a cutting edge is arranged at the front end of the arc-shaped long conductive blade, and an insulating gasket is arranged at the rear end; slopes are arranged at both ends of the T-shaped conductor to guide the arc-shaped long conductive blade to cut into the insulating layer of the main cable to the cable core of the main cable when being extruded and fed towards the middle of the cross arm, so that the arc-shaped long conductive blade is in electrical contact with both the cable core of the main cable and the T-shaped conductor at the same time.

[0008] Wherein, a first groove is provided in the middle of the upper surface of the T-shaped conductor for storing the insulating layer of the main cable cut off by the arc-shaped long conductive blade.

[0009] Wherein, the cutting edge of the arc-shaped long conductive blade is located on the side close to the insulating layer of the main cable; the arc radius of the lower surface of the arc-shaped long conductive blade is the same as or close to the arc radius of the upper surface of the T-shaped conductor, and the arc radius of the upper surface of the arc-shaped long conductive blade is the same as or close to the outer surface radius of the cable core of the main cable, so as to increase the contact area between the arc-shaped long conductive blade and both the cable core of the main cable and the T-shaped conductor at the same time.

[0010] Wherein, the feeding method of the arc-shaped long conductive blade is to use a flaring pliers to simultaneously contact the insulating gaskets of the two arc-shaped long conductive blades and exert force towards the middle of the cross arm to make the two arc-shaped long conductive blades feed relatively.

[0011] Wherein, the leg includes two left and right semi-circular long clamping plates; the upper ends of the two semi-circular long clamping plates are hinged so that the lower ends can be opened and closed relatively; the two semi-circular long clamping plates can jointly clamp the branch wire; convex grains are arranged on the inner arc surface of the semi-circular long clamping plate.

[0012] Wherein, a second groove is opened at the lower end of the T-shaped conductor; the second groove can be in interference fit with the wire core of the branch wire; the outer end of the second groove is in a flared shape to facilitate the insertion of the wire core.

[0013] Wherein, the leg is also equipped with a screw cap; the screw cap is sleeved outside the branch wire and can be screwed with the two closed semi-circular long clamping plates; the outer end of the screw cap is in a flared shape to facilitate the two closed semi-circular long clamping plates to be screwed in.

[0014] Wherein, sealing caps are respectively installed at both ends of the cross arm after the arc-shaped long conductive blades are completely fed into the cross arm; the sealing caps respectively include two semi-circular sealing cap bodies; after the two sealing cap bodies are combined, they jointly seal and hoop both ends of the cross arm.

[0015] Wherein, sealing gaskets are arranged on the contact surfaces of the upper clamping plate and the lower clamping plate; sealing gaskets are also arranged on the contact surfaces of the two semi-circular long clamping plates.

[0016] Through innovative structural design and process optimization, the single-conductor downlead T-type wire clamp shows significant advantages in terms of installation convenience, electrical connection reliability, environmental adaptability, and maintenance cost, and has the following outstanding beneficial effects compared with the prior art: (1) No need for pre-peeling, reducing the risk of live operation In the present invention, the main cable is directly clamped by the upper clamping plate and the lower clamping plate in the cross arm structure, and the arc-shaped long conductive blade embedded in the T-shaped conductor automatically cuts the insulating layer during the extrusion feeding process, so that electrical contact with the cable core can be achieved without prior peeling, that is, installation is carried out first, and then automatic peeling is performed inside, greatly reducing safety risks such as electric shock and sparks. The unified process reduces the workload of stripping and cleaning the peeling residues, and improves the construction efficiency and standardization level.

[0017] (2) Optimize the electrical contact structure to achieve low-resistance connection In the present invention, the design of the arc-shaped long conductive blade matches the outer surface of the main cable core and the concave arc surface of the T-shaped conductor, ensuring that a large-area, uniform and continuous surface contact can be formed during the feeding process. Compared with the local contact at the piercing point of the traditional piercing wire clamp, the extended contact area greatly reduces the contact resistance. The uniform mechanical clamping and conductive surface contact improve the long-term stability of the connection and prevent poor contact caused by micro-movement or vibration.

[0018] (3) Automatic cutting and insulating layer storage function During the feeding process, the arc-shaped long conductive blade is guided by a preset slope to cut into the insulating layer of the main cable, and the cut insulating strip is automatically stored in the first groove provided in the T-shaped conductor. It avoids the problem of residual insulating layer cutting on site, ensures the continuity and uniformity of the cutting process, and at the same time prevents the cut insulating layer from interfering with the electrical contact.

[0019] (4) Efficient connection between the branch wire and the main cable The leg part adopts two semi-circular long clamping plates on the left and right, and realizes firm clamping of the branch wire through the hinge and screw cap structure, and realizes interference fit with the wire core in the second groove of the T-shaped conductor. It can ensure reliable electrical connection between the branch wire and the main cable, and is convenient for installation and disassembly at the same time, improving the maintenance convenience of the system.

[0020] Compared with the traditional method that requires prior peeling, the present invention effectively avoids the operation risks, mechanical damages and subsequent environmental impacts that may occur during the peeling process, and at the same time reduces the danger of live working; while compared with the puncture connection method, the present invention significantly reduces the resistance and ensures long-term stable electrical connection through an optimized contact structure and an increased contact area. Generally speaking, the present invention not only has obvious advantages in construction safety, operation convenience and contact reliability, but also improves the durability and environmental adaptability of the entire connection system through sealing and mechanical stability design. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic external view of the wire clamp when the arc-shaped long conductive blade of the present invention is not fed. Figure 2 It is a schematic cross-sectional view of the wire clamp when the arc-shaped long conductive blade of the present invention is not fed. Figure 3 It is a schematic cross-sectional view of the wire clamp when the arc-shaped long conductive blade of the present invention cuts the main cable insulation layer under the guidance of a slope. Figure 4 It is a schematic cross-sectional view of the wire clamp after the arc-shaped long conductive blade of the present invention is fed in place. Figure 5 It is a schematic cross-sectional view of the wire clamp after the rotary cover and the sealing cover of the present invention are installed.

[0022] In the figure: 1, main cable; 11, main cable insulation layer; 111, insulating strip; 12, main cable core; 2, cross arm; 21, upper clamping plate; 22, lower clamping plate; 23, T-shaped conductor; 231, first groove; 232, second groove; 24, arc-shaped long conductive blade; 241, insulating gasket strip; 25, sealing cover; 251, sealing cover split body; 3, branch wire; 31, wire core; 4, support leg; 41, semi-circular long clamping plate; 42, rotary cover. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to 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 used to limit the present invention.

[0024] See Figures 1 to 5, the present invention relates to a single-conductor down-lead T-shaped wire clamp, which includes a cross arm 2 for electrically connecting the main cable 1 and a leg 4 for electrically connecting the branch wire 3; the cross arm 2 horizontally clamps the main cable 1, and the leg 3 vertically clamps the branch wire 3; the cross arm 2 includes an insulating upper clamping plate 21 and a lower clamping plate 22; the upper clamping plate 21 and the lower clamping plate 22 clamp the main cable 1 up and down and are locked by bolts or snap structures; a T-shaped conductor 23 is embedded in the lower clamping plate 22; the upper surface of the T-shaped conductor 23 is provided with a concave arc surface corresponding to the circumferential surface of the main cable 1; two arc-shaped long conductive blades 24 are respectively arranged at both ends of the upper part of the T-shaped conductor 23; the front end of the arc-shaped long conductive blade 24 is provided with a cutting edge, and the rear end is provided with an insulating gasket strip 241; slopes are arranged at both ends of the T-shaped conductor 23 to guide the arc-shaped long conductive blade 24 to cut into the main cable insulation layer 11 to the main cable core 12 when being extruded and fed towards the middle of the cross arm 2, so that the arc-shaped long conductive blade 24 is in electrical contact with both the main cable core 12 and the T-shaped conductor 23 at the same time.

[0025] Further, a first groove 231 is arranged in the middle of the upper surface of the T-shaped conductor 23 for storing the main cable insulation layer 11 cut by the arc-shaped long conductive blade 24.

[0026] Further, the cutting edge of the arc-shaped long conductive blade 24 is located on the side close to the main cable insulation layer 11; the arc radius of the lower surface of the arc-shaped long conductive blade 24 is the same as or close to the arc radius of the upper surface of the T-shaped conductor 23, and the arc radius of the upper surface of the arc-shaped long conductive blade 24 is the same as or close to the outer surface radius of the main cable core 12, so as to increase the contact area between the arc-shaped long conductive blade 24 and both the main cable core 12 and the T-shaped conductor 23 at the same time.

[0027] Further, the feeding method of the arc-shaped long conductive blade 24 is to use a flaring pliers to simultaneously contact the insulating gasket strips 241 of the two arc-shaped long conductive blades 24 and exert force towards the middle of the cross arm 2 to make the two arc-shaped long conductive blades 24 relatively feed.

[0028] Further, the leg 4 includes two left and right semi-circular long clamping plates 41; the upper ends of the two semi-circular long clamping plates 41 are hinged so that the lower ends can be opened and closed relatively; the two semi-circular long clamping plates 41 can jointly clamp the branch wire 3; convex grains are arranged on the inner arc surfaces of the semi-circular long clamping plates 41.

[0029] Further, a second groove 232 is opened at the lower end of the T-shaped conductor 23; the second groove 232 can be in interference fit with the wire core 31 of the branch wire 3; the outer end of the second groove 232 is in a flared shape to facilitate the insertion of the wire core 31.

[0030] Further, the leg 4 is also equipped with a screw cap 42; the screw cap 42 is sleeved outside the branch wire 3 and can be screwed with the two closed semi-circular long clamping plates 41; the outer end of the screw cap 42 is in a flared shape to facilitate the screwing-in of the two closed semi-circular long clamping plates 41.

[0031] Further, sealing caps 25 are respectively installed at both ends of the cross arm 2 after the arc-shaped long conductive blades 24 are completely fed into the cross arm 2; the sealing caps 25 respectively include two semi-circular sealing cap bodies 251; after the two sealing cap bodies 251 are combined, they jointly seal and hoop both ends of the cross arm 2.

[0032] Further, sealing gaskets are provided on the contact surfaces of the upper clamping plate 21 and the lower clamping plate 22; sealing gaskets are also provided on the contact surfaces of the two semi-circular long clamping plates 41.

[0033] Further, the installation method of the wire clamp includes the following steps: ① Refer to Figure 1 , without first removing the insulation layer of the main cable 1, directly clamp the drainage position on the main cable 1 with the upper clamping plate 21 and the lower clamping plate 22 one above the other, and lock it through a bolt or buckle structure.

[0034] ② Strip the insulation layer of the front end part of the branch wire 3 to expose a section of wire core 31, and pre-sleeve the screw cap 42 from the end of the branch wire 3 onto the branch wire 3; ③ Refer to Figure 2 , open the two semi-circular long clamping plates 41 left and right, insert the front end wire core 31 of the branch wire 3 into the second groove 232, so that the branch wire 3 is electrically connected to the T-shaped conductor 23; ④ Refer to Figure 5 , close the two semi-circular long clamping plates 41 to wrap the branch wire 3, then move the screw cap 42 upward and screw it with the closed two semi-circular long clamping plates 41, so that the convex grains on the inner arc surface of the semi-circular long clamping plates 41 are pressed against the insulation layer of the branch wire 3, thereby fixing the position of the branch wire 3; ⑤ Refer to Figure 3 and Figure 4 , use a flaring pliers to exert force from the insulating gasket strip 241 of the two arc-shaped long conductive blades 24 towards the middle of the cross arm 2 to relatively feed the two arc-shaped long conductive blades 24 until the insulating gasket strip 241 is flush with the end of the lower clamping plate 22; during the feeding process of the arc-shaped long conductive blades 24, due to the slopes provided at both ends of the T-shaped conductor 23, the cutting edge of the arc-shaped long conductive blade 24 cuts into the main cable insulation layer 11 to the main cable core 12, and continuously cuts off the main cable insulation layer 11 during its feeding process, and the cut insulation strips 111 accumulate in the first groove 231; after the arc-shaped long conductive blade 24 is complete, it simultaneously makes surface electrical contact with the main cable core 12 and the T-shaped conductor 23; ⑥ Refer to Figure 5 , respectively install the sealing cap 25 with the sealing cap bodies 251 at both ends of the cross arm 2 to seal both ends of the cross arm 2.

[0035] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. Single-conductor down-lead T-type clamp, characterized in that: It includes a cross arm (2) for electrically connecting the main cable (1) and a supporting leg (4) for electrically connecting the branch wire (3); the cross arm (2) horizontally clamps the main cable (1), and the supporting leg (3) vertically clamps the branch wire (3); the cross arm (2) includes an insulating upper clamping plate (21) and a lower clamping plate (22); the upper clamping plate (21) and the lower clamping plate (22) clamp the main cable (1) up and down and are locked by bolts or snap structures; an embedded T-shaped conductor (23) is provided in the lower clamping plate (22); an inner concave arc surface is provided on the upper surface of the T-shaped conductor (23) corresponding to the circumferential surface of the main cable (1); two arc-shaped long conductive blades (24) are respectively arranged at the outer ends of the upper part of the T-shaped conductor (23); a cutting edge is provided at the front end of the arc-shaped long conductive blade (24), and an insulating gasket strip (241) is provided at the rear end; slopes are provided at both ends of the T-shaped conductor (23) to guide the arc-shaped long conductive blade (24) to cut into the main cable insulation layer (11) to the main cable core (12) when being extruded and fed towards the middle of the cross arm (2), so that the arc-shaped long conductive blade (24) is in electrical contact with the main cable core (12) and the T-shaped conductor (23) at the same time.

2. The single-conductor downlead T-shaped wire clamp according to claim 1, wherein: A first groove (231) is provided in the middle of the upper surface of the T-shaped conductor (23) for storing the main cable insulation layer (11) cut by the arc-shaped long conductive blade (24).

3. The single-conductor downlead T-type wire clamp according to claim 2, wherein: The cutting edge of the arc-shaped long conductive blade (24) is located on the side close to the main cable insulation layer (11); the arc radius of the lower surface of the arc-shaped long conductive blade (24) is the same as or close to the arc radius of the upper surface of the T-shaped conductor (23), and the arc radius of the upper surface of the arc-shaped long conductive blade (24) is the same as or close to the outer surface radius of the main cable core (12) to increase the contact area between the arc-shaped long conductive blade (24) and the main cable core (12) and the T-shaped conductor (23) at the same time.

4. The single-conductor downlead T-shaped wire clamp according to claim 3, wherein: The feeding method of the arc-shaped long conductive blade (24) is to use a flaring pliers to simultaneously contact the insulating gasket strips (241) of the two arc-shaped long conductive blades (24) and exert force towards the middle of the cross arm (2) to make the two arc-shaped long conductive blades (24) relatively feed.

5. The single-conductor down-lead T-type wire clamp according to claim 1, characterized in that: The supporting leg (4) includes two left and right semi-circular long clamping plates (41); the upper ends of the two semi-circular long clamping plates (41) are hinged so that the lower ends can be relatively opened and closed; the two semi-circular long clamping plates (41) can jointly clamp the branch wire (3); convex particles are provided on the inner arc surface of the semi-circular long clamping plate (41).

6. The single-conductor downlead T-type wire clamp according to claim 5, characterized in that: A second groove (232) is opened at the lower end of the T-shaped conductor (23); the second groove (232) can be in interference fit with the wire core (31) of the branch wire (3); the outer end of the second groove (232) is in a flared shape to facilitate the insertion of the wire core (31).

7. The single-conductor downlead T-shaped wire clamp according to claim 6, characterized in that: The supporting leg (4) is also equipped with a rotary cover (42); the rotary cover (42) is sleeved outside the branch wire (3) and can be rotationally matched with the two closed semi-circular long clamping plates (41); the outer end of the rotary cover (42) is in a flared shape to facilitate the rotation of the two closed semi-circular long clamping plates (41) into it.

8. The single-conductor downlead T-type wire clamp according to claim 1, characterized in that: Sealing caps (25) are respectively installed at both ends of the cross arm (2) after the arc-shaped long conductive blades (24) are completely fed into the cross arm (2); the sealing caps (25) respectively include two semi-circular sealing cap sub-bodies (251); after the two sealing cap sub-bodies (251) are combined, they jointly seal and hoop the two ends of the cross arm (2).

9. The single-conductor down-lead T-type wire clamp according to claim 5, characterized in that: Sealing gaskets are provided on the contact surfaces of the upper clamping plate (21) and the lower clamping plate (22); sealing gaskets are also provided on the contact surfaces of the two semi-circular long clamping plates (41).

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