Power cable traction head embedded with traction screw

Abstract

The utility model belongs to the technical field of power equipment, and particularly relates to a power cable traction head implanted with a traction screw. Comprising a traction screw, a metal pressing ring and a traction ring, wherein the traction screw is a threaded screw with a cone at one end and a cotter pin hole at the other end; one end of the traction screw with a cone is implanted into the cable conductor, a metal compression ring is arranged outside the cable conductor to compress the traction screw and the cable conductor, and one end of the traction screw with a cotter pin hole extends out of the cable conductor and is connected with a traction ring; the traction force directly acts on the conductor through the tight combination of the traction screw rod and the cable conductor, and compared with the traction force of a traditional steel wire sleeve acting on a cable sheath made of a high polymer material in the prior art, the traction head can bear larger traction force.

Description

Technical Field

[0001] The utility model belongs to the technical field of power equipment, in particular to a power cable traction head implanted with a traction screw. Background Technique

[0002] Finished power cables are delivered wound on cable reels. Such cables are heavy, and some exceed 10 tons per reel. When laying cables, generally, a steel wire sleeve is put on the outer sheath of the cable polymer material for traction through a pipe, or traction is placed in a cable trench, or traction is placed on a cable tray. The method of traction with a steel wire sleeve is shown in Figure 1 (Schematic diagram of the cable traction method with a steel wire sleeve). The traction force of this traction method acts on the outer sheath of the cable polymer material. Since the outer sheath is plastic, the traction force it can withstand is limited. Especially when the environmental temperature is too high during cable laying, the outer sheath material becomes soft and loses the mechanical strength to resist the traction force. The outer sheath will be pulled off during traction, resulting in cable damage and traction failure accidents.

[0003] Therefore, this application proposes a power cable traction head implanted with a traction screw. Content of the Utility Model

[0004] The purpose of the utility model is to propose a power cable traction head implanted with a traction screw, and utilize the advantage that a metal conductor can withstand a greater traction force to realize safe and reliable traction and pay-off of power cables.

[0005] To solve the above technical problems, the utility model adopts the following technical solutions:

[0006] A power cable traction head implanted with a traction screw includes a traction screw, a metal pressing ring and a traction ring. The traction screw is a threaded screw with a cone at one end and an open pin hole at the other end. For a multi-core cable, the outer diameter of the traction screw can just be implanted into the gap between the multi-core cable conductors; for a single-wire cable, the single conductor wire can be opened into an umbrella shape, so that the traction screw is implanted into the single conductor wire, and then the single conductor wire is closed to wrap the traction screw.

[0007] The end of the traction screw with the cone is implanted into the cable conductor, and a metal pressing ring is arranged outside the cable conductor to press the traction screw and the cable conductor tightly. Its traction force is transmitted to the cable conductor through the traction screw, and by utilizing the advantage that a metal conductor can withstand a greater traction force, safe and reliable traction and pay-off of power cables are realized.

[0008] The end of the traction screw with the open pin hole extends out of the cable conductor and is connected with a traction ring.

[0009] Further, in order to prevent the traction ring from loosening during traction when towing the cable, an open pin is installed at the end of the traction screw, so that the cable can enter normal traction laying.

[0010] Furthermore, a screw protection cap is provided on the traction screw at one end of the cable conductor. The screw protection cap is a plastic component with internal threads.

[0011] Furthermore, the metal pressing ring is a cylindrical component made of soft metal. It is preferably made of pure soft aluminum (not limited to soft aluminum metal, it can be copper, iron, thick binding steel strip, etc.).

[0012] Furthermore, a heat-shrinkable sealing cap for sealing the cable head well is provided outside the metal pressing ring. The heat-shrinkable sealing cap is made of a polymer heat-shrinkable material and is used to protect the part of the traction screw exposed outside the cable head to prevent mechanical damage to the traction screw during transportation and hoisting. During cable construction, the plastic traction screw protection cap is unscrewed, and the traction ring is tightened on the exposed part of the traction screw.

[0013] Compared with the prior art, the utility model has at least one of the following beneficial effects:

[0014] 1. One end of the traction screw has a taper, and the remaining part is a threaded screw. After the metal pressing ring is squeezed by force, the cable conductor is partially squeezed into the thread groove of the traction screw, so that the cable head is not easily slipped when subjected to the traction force. When the cable traction force is too large, the tapered part of the traction screw moves in the traction direction, which can play a role in resisting the traction force from the traction direction and making the traction head tighter and tighter.

[0015] 2. The traction force of the present invention is directly applied to the conductor through the close combination of the traction screw and the cable conductor. Compared with the prior art that the traction force of the traditional wire sleeve acts on the cable sheath made of polymer material, the traction head of the present invention can withstand a greater pulling force.

[0016] 3. The traction screw and the metal pressing ring of the present cable traction head are easily assembled in the cable manufacturing factory. When pulling and laying the cable at the construction site, only the traction ring needs to be installed to realize the traction of the cable. It saves the time for making the cable traction head at the construction site and brings great convenience to the construction cable laying.

[0017] 4. The manufacturing cost of the power cable traction head with an implanted traction screw in this application does not exceed 50 yuan, saving 150% of the cost compared with other forms of cable traction heads. Under normal use conditions, the traction screw and the traction ring can be recycled and reused. When reused, the consumables are only the metal pressing ring and the split pin, and the cost of making a cable traction head can be reduced to less than 15 yuan.

[0018] 5. The power cable traction head with an implanted traction screw in this application is completed in the cable manufacturing factory, changing the tradition of sending the cable to the construction site to install the cable traction head. While facilitating the construction cable laying, the cable with the cable traction head installed in the factory has a more popular market competitive advantage among users. Description of the Drawings

[0019] Figure 1 Schematic diagram of the cable traction method using a steel wire sleeve for the prior art;

[0020] Figure 2 Schematic diagram of the installation of the traction ring in this application (before cable construction);

[0021] Figure 3 Schematic diagram of the installation of the metal compression ring in this application;

[0022] Figure 4 Schematic diagram of the structure of this application;

[0023] Figure 5 Schematic diagram of the well-compressed metal compression ring of this application;

[0024] Figure 6 Schematic diagram of the heat-shrinkable sealing cap encapsulated in this application;

[0025] Figure 7 Schematic diagram of the implanted traction screw in this application (multi-core cable);

[0026] Figure 8 Schematic diagram of the implanted traction screw in this application (single-core cable);

[0027] Figure 9 Schematic diagram of the application of the plastic traction screw protection cap in this application (cable shipping state).

[0028] In the figure, 1 - cable outer sheath; 2 - cable insulation extrusion layer; 3 - cable conductor; 4 - traction screw; 5 - metal compression ring; 6 - heat-shrinkable sealing cap; 7 - traction ring; 8 - split pin; 9 - screw protection cap. Detailed implementation manners

[0029] In order to make the objectives, technical solutions and advantages of the present utility model clearer, the present utility model 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 utility model and are not used to limit the present utility model.

[0030] Embodiment 1

[0031] As Figure 1-8 shown, this embodiment is used on a multi-core cable.

[0032] A traction head for a power cable with an implanted traction screw, comprising a traction screw 4, a metal compression ring 5 and a traction ring 7. The traction screw 4 is a threaded screw with a cone at one end and a split pin hole at the other end. For a multi-core cable, the outer diameter of the traction screw 4 can just be implanted into the gap between the multi-core cable conductors;

[0033] One end of the traction screw 4 with a cone is implanted into the cable conductor 3, and a metal compression ring 5 is arranged outside the cable conductor 3 to press the traction screw 4 and the cable conductor 3 tightly. The traction force is transmitted to the cable conductor 3 through the traction screw 4, and by utilizing the advantage that the metal conductor can withstand a greater traction force, the safe and reliable traction and laying of the power cable are realized.

[0034] One end of the traction screw 4 with an open pin hole extends out of the cable conductor 3 and is connected with a traction ring 7.

[0035] Furthermore, in order to prevent the traction ring 7 from loosening during the traction of the cable, an open pin 8 is installed at the end of the traction screw 4, so that the cable can enter the normal traction and laying.

[0036] Furthermore, a screw protection cap 9 is arranged on the traction screw 4 at the end extending out of the cable conductor 3, and the screw protection cap 9 is a plastic component with internal threads.

[0037] Furthermore, the metal compression ring 5 is a cylindrical component made of soft metal, and preferably pure soft aluminum is used (not limited to soft aluminum metal, it can be copper, iron, thick binding steel strip, etc.).

[0038] Furthermore, a heat shrinkage sealing cap 6 for sealing the cable head well is arranged outside the metal compression ring 5. The heat shrinkage sealing cap 6 is made of a polymer heat shrinkable material and is used to protect the part of the traction screw 4 exposed outside the cable head to prevent mechanical damage to the traction screw 4 during transportation and hoisting. During cable construction, the plastic screw protection cap 9 is unscrewed, and the traction ring 7 is tightened on the exposed part of the traction screw 4.

[0039] Assembly method:

[0040] A. First, strip the head structure layer at the end of the cable to be tractioned as shown, implant the traction bolt (4) into the middle of the conductor as shown; Figure 3 shown; Figure 3 shown;

[0041] B. Insert the metal compression ring 5 into the combination of the conductor 3 and the traction screw 4; as shown; Figure 4 shown;

[0042] C. Use a crimping tool to tightly press the metal compression ring 5 so that the metal compression ring 5, the conductor 3 and the traction screw 4 form a tight combination, as shown; Figure 5 shown;

[0043] D. Use a heat shrinkage sealing sleeve to seal the whole cable head, exposing the end of the traction screw 4, as shown; Figure 4 shown;

[0044] E. Screw the screw protection cap 9 onto the exposed part of the traction screw 4. At this time, the cable is in the shipping state, as shown; Figure 7 shown;

[0045] F. After the cable is shipped and arrives at the construction site, before construction, remove the protective cap (9) of the cable traction head, screw in the traction ring 7, and tighten it, as Figure 7 shown.

[0046] G. After the traction ring 7 is tightened on the traction screw 4, install the split pin 8 to prevent the traction ring 7 from loosening on the traction screw 4 due to the cable torque during traction, as Figure 8 shown. After the split pin 8 is installed, the cable can be normally tractioned, as Figure 9 shown.

[0047] Embodiment 2

[0048] The difference between this embodiment and Embodiment 1 is that, as Figure 9 shown, for a single-wire cable, the conductor single wires can be opened in an umbrella shape, the traction screw can be implanted into the conductor single wires, and then the conductor single wires can be closed to wrap the traction screw.

[0049] Although the present invention has been described herein with reference to a number of illustrative embodiments of the present invention, it should be understood that those skilled in the art can design many other modifications and embodiments that will fall within the scope and spirit of the principles disclosed in this application. More specifically, within the scope of this application disclosure, the drawings, and the claims, various variations and improvements can be made to the components and / or the layout of the subject combination layout. In addition to the variations and improvements made to the components and / or the layout, other uses will also be apparent to those skilled in the art.

Claims

1. A traction head for a power cable with an implanted traction screw, characterized in that: It includes a traction screw (4), a metal compression ring (5) and a traction ring (7). The traction screw (4) is a threaded screw with a cone at one end and an open pin hole at the other end. The end of the traction screw (4) with the cone is implanted into the cable conductor (3). A metal compression ring (5) is arranged outside the cable conductor (3) to press the traction screw (4) and the cable conductor (3) tightly. The end of the traction screw (4) with the open pin hole extends out of the cable conductor (3) and is connected with a traction ring (7).

2. The power cable traction head with an implanted traction screw according to claim 1, characterized in that: An open pin (8) is arranged on the open pin hole.

3. The power cable traction head with an implanted traction screw according to claim 1, characterized in that: A screw protection cap (9) is arranged on the traction screw (4) at the end extending out of the cable conductor (3). The screw protection cap (9) is a plastic component with internal threads.

4. The power cable traction head with an implanted traction screw according to claim 1, characterized in that: The metal compression ring (5) is a cylindrical component made of soft metal.

5. A power cable traction head with an implanted traction screw according to claim 1, characterized in that: A heat shrink sealing cap (6) for sealing the cable head well is arranged outside the metal compression ring (5).

6. The power cable traction head with an implanted traction screw according to claim 5, characterized in that: The heat shrink sealing cap (6) is made of a polymer heat shrink material.

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