Strain clamp
By introducing an equipotential bonding mechanism into the tension clamp to connect with the inner core of the cable, the discharge problem during the installation of the tension clamp is solved, thereby improving the protection and safety of the conductor and reducing mechanical damage and maintenance costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-22
- Publication Date
- 2026-04-07
AI Technical Summary
Tension clamps can damage the conductor insulation during installation or cause cracks in the insulation layer over a long period of time, leading to discharge phenomena, which in turn can burn the conductor and potentially break down the insulator.
Design a tension clamp that uses an equipotential bonding mechanism to connect with the inner core of the cable through puncture, avoiding discharge caused by potential difference. This includes an adjustable depth design for the puncture screw and puncture needle, as well as a rounded, raised pressure tongue structure to reduce damage to the cable.
It effectively avoids discharge phenomena, protects conductors and insulators, extends conductor life, reduces maintenance costs, improves safety and versatility, and reduces mechanical damage.
Smart Images
Figure CN224097377U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The application belongs to the field of cable laying fittings, and particularly relates to a strain clamp. BACKGROUND
[0002] The strain clamp (tension clamp, strain clamp, dead-end clamp) refers to a fitting used for fixing a conductor to bear the tension of the conductor and hanging the conductor to a strain string group or a tower.
[0003] When the strain clamp is installed, the insulating skin of the conductor or the insulating layer of the insulating conductor is damaged for a long time, there is a gap of the damaged insulating layer between the conductor core and the strain clamp, the conductor core (live body) and the strain clamp (non-live) discharge, the sound is sharp, and the long-time discharge can ablate the conductor and even break down the insulator. CONTENT OF THE UTILITY MODEL
[0004] Technical problem, the technical problem to be solved by the application is to improve the discharge phenomenon caused by the damage or partial breakage of the cable insulating layer, provide a strain clamp with an equipotential connection mechanism, reduce the ablation of the conductor, and improve the safety effect.
[0005] Technical scheme: a strain clamp, comprising a main body and a plurality of tongue depressors, the main body and the tongue depressors are connected, and the cavity through which the cable passes is formed, characterized in that an equipotential connection mechanism is arranged on the main body and / or the tongue depressor, and the equipotential connection mechanism points to the cavity. The equipotential connection mechanism pierces the insulating layer of the outer layer of the cable in a puncture manner and communicates with the inner core of the cable, realizes the equipotential connection between the strain clamp and the cable, and avoids the occurrence of the discharge phenomenon.
[0006] Further, a wire laying groove is arranged on the upper part of the main body, and a wire pressing groove is arranged on the lower part of the tongue depressor, the wire laying groove and the wire pressing groove are oppositely arranged to form the cavity, and a through hole pointing to the wire laying groove is formed on the outer wall of the wire laying groove at any position;
[0007] The equipotential connection mechanism is a puncture screw rod, and the puncture screw rod passes through the through hole. After the puncture screw rod passes through the through hole, the puncture screw rod pierces into the inner core of the cable to form the equipotential connection.
[0008] Further, a screw thread is arranged in the through hole, and a matching screw thread is arranged on the side wall of the puncture screw rod. The puncture screw rod can adjust the puncture depth in a threaded connection manner, so as to prevent the damage to the structure of the cable caused by excessive puncture.
[0009] Further, the puncture screw rod comprises an insertion end and a screwing end which are connected to each other, and the diameter of the insertion end is smaller than that of the screwing end;
[0010] The matching screw thread is arranged on the screwing end;
[0011] The insertion end is equipped with a stripping thread. By rotating through the stripping thread to insert into the cable, the piercing path is smoother, reducing damage to the cable compared to direct insertion.
[0012] Furthermore, the insertion end has a tapered tip, and the stripping thread covers the tapered tip. The tapered tip, combined with the stripping thread covering it, facilitates piercing.
[0013] Furthermore, the through hole is opened at the end of the main body to reduce damage to the main structure; and it is located at the center of its bottom to maximize the volume of the solid around the through hole and reduce the damage to the overall strength of the main body caused by the perforation.
[0014] Furthermore, a wire-pressing groove is provided at the lower part of the pressure tongue, and the equipotential bonding mechanism is a puncture needle, which is set in the wire-pressing groove with its end pointing to the central axis of the wire-pressing groove. The puncture needle is pressed into the inner core of the connecting cable by the pressure tongue.
[0015] Furthermore, the two ends of the pressure groove of the pressure tongue are rounded and raised to prevent damage to the cable sheath from the edges at both ends when pressing down; the piercing needle is located in the middle of the pressure groove to prevent deviation during the pressing process and make the pressed cable more stable.
[0016] Furthermore, the chamfer at the end of the puncture needle is oriented in the same direction as the central axis of the wire groove. This makes the end face of the puncture needle rectangular, with its long side aligned with the central axis of the cable, increasing the contact area between the end face of the puncture needle and the inner core of the cable.
[0017] Furthermore, the main body is provided with several connecting seats, and the pressure tongue is provided with a force-receiving groove. The pressure tongues, which are equal in number to the number of connecting seats, are pressed into the force-receiving grooves by U-shaped clips and connected to these connecting seats respectively.
[0018] At least one of these clamps is equipped with a puncture needle. Multiple connectors are provided on the jumper side of the cable. When the jumper side is long, meaning there are many connectors, only some clamps with puncture needles need to be selected to prevent excessive punctures from damaging the cable.
[0019] The beneficial effects of this application are as follows:
[0020] 1. By using an equipotential bonding mechanism, the tension clamp and the inner core of the conductor are made to be at the same potential, which effectively avoids the discharge phenomenon caused by potential difference and protects the conductor and insulator from damage.
[0021] 2. It eliminates the erosion effect of prolonged discharge on the conductor, extends the service life of the conductor, and reduces maintenance costs.
[0022] 3. It reduces the risk of insulators being broken down by discharge, enhances the overall safety of the power system, and reduces the possibility of accidents.
[0023] 4. The piercing depth of the piercing screw is adjustable, and the stripping thread and rounded corner design reduce damage to the conductor structure, maximizing the protection of conductor integrity during installation and reducing damage caused by improper installation.
[0024] 5. Flexible puncture needle configuration, suitable for clamps on different length jumper sides, improves the versatility and adaptability of tension clamps, and meets the needs of different scenarios.
[0025] 6. The puncture needle is located in the center of the crimping groove. This position prevents displacement during the crimping process. Centering ensures a more even force is applied to the cable during pressing, guaranteeing cable stability and improving installation accuracy.
[0026] 7. The chamfer at the tip of the puncture needle is aligned with the central axis of the wire groove. This design makes the end face of the puncture needle rectangular, with its long side aligned with the central axis of the cable. This structure increases the contact area between the end face of the puncture needle and the inner core of the cable, thereby improving the reliability and conductivity of the connection.
[0027] 8. The cable clamping grooves on the clamping tongue have rounded, upturned ends. This design effectively prevents damage to the cable sheath from the edges when clamping the cable. The rounded, upturned structure reduces direct contact between sharp edges and the cable, thus protecting the cable's integrity and preventing mechanical damage during installation. Attached Figure Description
[0028] Figure 1 This is a front view of the main body of Embodiment 1 of this application;
[0029] Figure 2 This is a top view of the main body of Embodiment 1 of this application;
[0030] Figure 3 This is a bottom view of the main body of Embodiment 1 of this application;
[0031] Figure 4 This is a three-dimensional and partial enlarged view of the main body of Embodiment 1 of this application;
[0032] Figure 5 This is a front view of the puncture screw according to Embodiment 1 of this application;
[0033] Figure 6 This is a three-dimensional schematic diagram of the puncture screw in Embodiment 1 of this application;
[0034] Figures 7-9 This is a partial connection diagram of Embodiment 1 of this application;
[0035] Figures 10-12 This is a schematic diagram of the tongue depressor in Embodiment 2 of this application;
[0036] Figure 13 ,14 This is a schematic diagram of the overall connection of Embodiment 2 of this application;
[0037] Figures 15-17 This is a schematic diagram illustrating the usage status of this application, in which... Figure 17 This is a sectional view.
[0038] In the diagram: 1. Cable tray; 2. Reinforcing rib; 3. Side plate; 4. Hinge seat; 5. Spacing side; 6. Jumper side; 7. Connecting seat; 8. Protrusion; 9. U-shaped clip; 10. Mounting groove; 11. Ordinary gasket; 12. Elastic gasket; 13. Nut; 14. Force groove; 15. Cable crimping groove; 16. Through hole; 17. Piercing screw; 18. Insertion end; 19. Tightening end; 20. Conical tip; 21. Piercing needle; 22. Piercing chamfer; 23. Cable. Detailed Implementation
[0039] Example 1:
[0040] like Figures 1-9 As shown: A tension clamp includes a main body and a pressure tongue. The main body is generally L-shaped with an flared angle, and a cable-laying groove 1 is formed along the main body. A reinforcing rib 2 is provided on the opposite side of the cable-laying groove 1.
[0041] The side plates 3 on both sides of the cable tray 1 at the corner extend outward (in the direction of wrapping the cable 23), and the extended side plates 3 are provided with hinge seats 4. The hinge seats 4 are used to connect to insulated terminals or other fixed parts on the line pole.
[0042] The smooth curved ends on both sides of the corner are the span side 5, and the side near the taut overhead cable 23 is the jumper side 6, which has multiple connectors 7 for connecting the pressure tongue.
[0043] The connector 7 consists of protrusions 8 spaced apart on both sides of the cable tray 1 on the jumper side 6. The protrusions 8 on both sides are symmetrically arranged. A U-shaped clip 9 is installed between every two adjacent protrusions 8. The straight rods on both sides of the U-shaped clip 9 are inserted into the mounting grooves 10 spaced apart on both sides of the protrusions 8. The straight rods extending from the end face of the mounting groove 10 are sequentially fitted with ordinary washers 11 and elastic washers 12, and then tightened with nuts 13.
[0044] The upper semi-circular part of the U-shaped clip 9 is embedded in the force groove 14 at the top of the pressure tongue. The bottom of the pressure tongue has a wire pressing groove 15, which is opposite to the wire laying groove 1. By tightening the nut 13, the U-shaped clip 9 is pulled down to drive the pressure tongue to press the cable 23 into the wire laying groove 1.
[0045] A through hole 16 is provided at the bottom center position near the end of the jumper cable 6. The through hole 16 is threaded, and the side wall of the piercing screw 17 is provided with a tightening thread. The piercing screw 17 is connected by threads, which allows the piercing depth to be adjusted, preventing excessive piercing from damaging the cable 23 structure.
[0046] The piercing screw 17 includes an insertion end 18 and a tightening end 19 connected to each other, wherein the diameter of the insertion end 18 is smaller than that of the tightening end 19;
[0047] The mating thread is located at the tightening end 19;
[0048] The insertion end 18 is provided with a stripping thread. By rotating through the stripping thread to insert into the cable 23, the piercing path is smoother, which reduces damage to the cable 23 compared to direct insertion.
[0049] The end of the insertion end 18 is a tapered tip 20, and the stripping thread covers the tapered tip 20. The tapered tip, in conjunction with the stripping thread covering it, facilitates piercing.
[0050] After the crimping is completed, screw the piercing screw 17 into the through hole 16.
[0051] Example 2:
[0052] like Figures 10-17 As shown, to prevent damage to the main structure caused by openings on the main body, this embodiment sets the equipotential bonding mechanism on the pressure tongue. A wire-pressing groove 15 is provided at the lower part of the pressure tongue. The equipotential bonding mechanism is a puncture needle 21, which is disposed within the wire-pressing groove 15, with its end pointing towards the central axis of the groove 15. The pressure tongue presses the puncture needle 21 into the inner core of the connecting cable 23.
[0053] The pressure groove 15 of the pressure tongue has rounded corners at both ends to prevent damage to the outer sheath of the cable 23 when it is pressed down; the puncture needle 21 is located in the middle of the pressure groove 15; and two puncture needles are arranged axially. The puncture needle 21 can be integrally formed with the pressure tongue or detachably connected.
[0054] The chamfer 22 at the end of the puncture needle 21 is oriented in the same direction as the central axis of the wire groove 15. This makes the end face of the puncture needle 21 rectangular, with its long side aligned with the central axis of the cable 23, thus increasing the contact area between the end face of the puncture needle 21 and the inner core of the cable 23.
[0055] At least one of the tongues connected to the jumper side 6 is equipped with a piercing needle 21. Multiple connectors 7 are provided on the jumper side 6. When the jumper side 6 is long, that is, when there are many connectors 7, only some of the tongues with piercing needles 21 can be selected to prevent excessive piercing from damaging the cable 23.
Claims
1. A tension clamp, comprising a main body and a plurality of pressure tongues, wherein the cavity between the main body and the pressure tongues is for the passage of a cable, characterized in that, An equipotential bonding mechanism is provided on the main body and / or the pressure tongue, and the equipotential bonding mechanism points towards the cavity.
2. The tension clamp as described in claim 1, characterized in that, The upper part of the main body is provided with a wire-laying groove (1), and a through hole (16) pointing to the wire-laying groove (1) is opened at any position on the outer wall of the wire-laying groove (1). The equipotential bonding mechanism is a piercing screw (17), which passes through the through hole (16).
3. A tension clamp as described in claim 2, characterized in that, The through hole (16) has a tightening thread, and the side wall of the piercing screw (17) is provided with a mating thread that engages with the tightening thread.
4. A tension clamp as described in claim 3, characterized in that, The piercing screw (17) includes an insertion end (18) and a tightening end (19) connected to each other, wherein the diameter of the insertion end (18) is smaller than that of the tightening end (19). The mating thread is provided on the tightening end (19); The insertion end (18) is provided with a stripping thread.
5. A tension clamp as described in claim 4, characterized in that, The end of the insertion end (18) is a tapered tip (20), and the stripping thread covers the tapered tip (20).
6. A tension clamp as described in any one of claims 2-5, characterized in that, The through hole (16) is opened at the end of the body and located at the center of its bottom.
7. A tension clamp as described in claim 1, characterized in that, The lower part of the pressure tongue is provided with a pressure groove (15), and the equipotential connection mechanism is a puncture needle (21). The puncture needle (21) is located in the pressure groove (15), and its end points to the central axis of the pressure groove (15).
8. A tension clamp as described in claim 7, characterized in that, The pressure groove (15) of the pressure tongue has rounded corners at both ends, and the puncture needle (21) is located in the middle of the pressure groove (15).
9. A tension clamp as described in claim 8, characterized in that, The insertion chamfer (22) at the end of the puncture needle (21) is opened in the same direction as the central axis of the pressure groove (15).
10. A tension clamp as described in any one of claims 7-9, characterized in that, The main body is provided with a number of connecting seats (7), and the pressure tongue is provided with a force groove (14). The pressure tongues, which are equal in number to the number of connecting seats (7), are pressed into the force grooves (14) by U-shaped clips (9) and connected to these connecting seats (7) respectively. At least one of these tongue depressors is equipped with the aforementioned puncture needle (21).