A cable intermediate joint installation method and expansion device

Abstract

A cable intermediate joint installation method and expansion device, the cable intermediate joint installation method includes the following steps: open one end of the intermediate joint and keep it in a supported state; fit the isolation layer on the broken end of the insulating shielding layer of the first cable; put the intermediate joint on the first cable until the insulating layer of the first cable is exposed at the other end of the intermediate joint; connect the first cable with another second cable that needs to be connected; pull the intermediate joint along the direction of the first cable toward the second cable until the insulating layers of the first cable and the second cable enter the interior of the intermediate joint; remove the isolation layer from the first cable. The method of the embodiment of the present invention reduces the difficulty of inserting the first cable by expanding one end of the intermediate joint. By arranging the isolation layer on the port of the insulating shielding layer of the first cable, it is possible to effectively prevent the decarbonized particles on the insulating shielding layer from falling into the intermediate joint.

Description

Technical Field

[0001] The invention belongs to the field of high-voltage power cables, and in particular relates to a cable intermediate joint installation method and an expansion device. Background Art

[0002] With the rapid increase of urbanization and electricity demand, long-distance high-voltage power transmission construction is increasing, and the demand for cable accessories is also increasing. Among the cable accessories, the intermediate joints used for cable docking are inevitably used in large quantities.

[0003] There are generally two installation methods for high-voltage power cable intermediate joints, one is pre-expansion and the other is sliding installation. When sliding installation is used, during the installation process, the intermediate joint body will directly contact the insulation shielding layer of the cable, and the decarbonized particles on the insulation shielding layer of the cable can easily adhere to the inside of the intermediate joint, affecting the performance of the contact surface between the intermediate joint and the cable, and thus causing cable line failure. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a cable intermediate joint installation method, which solves the problem that the intermediate joint is easily adhered to decarbonized particles during the installation process. The present invention also proposes a cable intermediate joint expansion device.

[0005] According to the first aspect of the present invention, the cable intermediate joint installation method includes the following steps: stretching one end of the intermediate joint and keeping it in a supported state; attaching an isolation layer to the insulating shielding layer of the first cable and covering the break of the insulating shielding layer; aligning the stretched end of the intermediate joint with the end to be connected of the first cable, and putting the intermediate joint on the first cable until the insulating layer of the first cable is exposed at the other end of the intermediate joint; connecting the first cable to another second cable that needs to be connected; pulling the intermediate joint along the direction of the first cable toward the second cable until the insulating layer of the second cable enters the interior of the intermediate joint; removing the isolation layer from the first cable.

[0006] The cable intermediate joint installation method according to the embodiment of the present invention has at least the following technical effects: during the installation of the intermediate joint, by expanding one end of the intermediate joint, it is possible to facilitate the first cable to pass through the intermediate joint from the expanded position, thereby reducing the difficulty of inserting the first cable. By arranging a certain length of isolation layer on the insulating shielding layer of the first cable, it is possible to effectively prevent the decarbonized particles on the insulating shielding layer from falling into the intermediate joint. After the first cable and the second cable are butt-jointed, the insulating layer of the first cable and the insulating layer of the second cable are pulled into the intermediate joint, so that the protective function of the intermediate joint can be fully exerted.

[0007] According to some embodiments of the present invention, the isolation layer is a heat shrink tube or a cold shrink tube.

[0008] According to some embodiments of the present invention, after the intermediate joint is installed, the first cable and the second cable have the same length in the intermediate joint.

[0009] According to some embodiments of the present invention, the above-mentioned cable intermediate joint installation method further includes the following steps: applying lubricating oil on the outer surface of the isolation layer.

[0010] According to some embodiments of the present invention, the above-mentioned cable intermediate joint installation method further includes the following steps: connecting the first cable and the second cable using a connecting pipe.

[0011] According to the second aspect of the present invention, the cable intermediate joint expansion device includes: a guide portion, which is used to open one end of the intermediate joint; an expansion portion, which is arranged on the outer surface of the guide portion and is used to support the opened end of the intermediate joint; a first support portion, which is connected to the expansion portion; a second support portion, which is fastened to the other end of the intermediate joint; a tightening portion, one end of which is connected to the first support portion and the other end of which is connected to the second support portion, and is used to tighten the first support portion and the second support portion; the tightening portion, the first support portion and the second support portion are used together to assist the expansion portion in supporting the opened end of the intermediate joint.

[0012] The cable intermediate joint expansion device according to the embodiment of the present invention has at least the following technical effects: one end of the intermediate joint can be expanded through the guide part, so that the expansion part has a certain support foundation. The expanded end of the guide part can be continuously supported by the expansion part, the tightening part, the first support part and the second support part to ensure that one end of the intermediate joint can still be supported after the guide part is removed, so that the cable can move more smoothly in the intermediate joint. Compared with the installation process of the traditional intermediate joint, the cable intermediate joint expansion device according to the embodiment of the present invention can reduce the difficulty of installation work and improve installation efficiency.

[0013] According to some embodiments of the present invention, the guide portion is a guide cone.

[0014] According to some embodiments of the present invention, the expansion portion is an expansion shoe.

[0015] According to some embodiments of the present invention, a plurality of eye screws are connected to both the first supporting portion and the second supporting portion, and the plurality of eye screws are used to connect the tightening portion.

[0016] According to some embodiments of the present invention, the tightening portion is an elastic connecting band.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0019] Figure 1-1 This is a working diagram of the cable intermediate joint expansion device according to an embodiment of the present invention (the intermediate joint has not yet been expanded);

[0020] Figure 1-2 1 is a working diagram of the cable intermediate joint expansion device according to an embodiment of the present invention (one end of the intermediate joint is expanded);

[0021] Figure 1-3 This is a working diagram of the cable intermediate joint expansion device according to an embodiment of the present invention (the guide part has been removed);

[0022] Figure 2 is a schematic structural diagram of a first cable and an isolation layer according to an embodiment of the present invention;

[0023] Figure 3-1 is a wiring working condition diagram of an embodiment of the present invention (the first cable and the isolation layer have been inserted into the middle joint);

[0024] Figure 3-2 1 is a wiring diagram of an embodiment of the present invention (the first cable and the second cable have been connected);

[0025] Figure 3-3 is a wiring operating diagram of an embodiment of the present invention (the isolation layer has been removed);

[0026] Figure 3-4 This is a wiring working condition diagram of an embodiment of the present invention (the cable intermediate joint expansion device of the embodiment of the present invention has been removed).

[0027] Reference numerals:

[0028] Guide part 100,

[0029] Expansion unit 200,

[0030] The first support part 300,

[0031] The second support part 400,

[0032] Tightening part 500,

[0033] Open the middle joint 600,

[0034] Eyebolt 700,

[0035] Isolation layer 810 , first cable 820 , second cable 830 , connecting tube 840 , and pressure equalizing sleeve 850 . DETAILED DESCRIPTION

[0036] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0037] In the description of the present invention, if there is a description of first, second, third, fourth, etc., it is only for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the sequence of the indicated technical features.

[0038] In the description of the present invention, unless otherwise clearly defined, words such as setting and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above words in the present invention in combination with the specific content of the technical solution.

[0039] Reference below Figure 1-1 to Figure 3-4 A method for installing an intermediate cable joint according to an embodiment of the first aspect of the present invention is described.

[0040] The cable intermediate joint installation method according to an embodiment of the present invention comprises the following steps:

[0041] Open one end of the middle joint 600 and keep it in a supported state;

[0042] The isolation layer 810 is attached to the insulation shielding layer of the first cable 820 and covers the break of the insulation shielding layer;

[0043] Align the open end of the intermediate joint 600 with the end to be connected of the first cable 820, and put the intermediate joint 600 on the first cable 820 until the insulation layer of the first cable 820 is exposed at the other end of the intermediate joint 600;

[0044] Connect the first cable 820 to another second cable 830 that needs to be connected;

[0045] Pull the middle joint 600 along the first cable 820 toward the second cable 830 until the insulation layer of the second cable 830 enters the interior of the middle joint 600;

[0046] The isolation layer 810 is removed from the first cable 820 .

[0047] refer to Figure 1-1 to Figure 3-4Before inserting the first cable 820 into the intermediate joint 600, one end of the intermediate joint 600 needs to be expanded first, so as to ensure that the first cable 820 can enter the intermediate joint 600 more smoothly. In some embodiments of the present invention, one end of the intermediate joint 600 is expanded by the cable intermediate joint expansion device of the embodiment of the present invention.

[0048] In order to ensure that no decarbonized particles on the insulating shielding layer adhere to the inside of the intermediate joint 600 during the process of the first cable 820 passing through the intermediate joint 600 and wiring, especially the decarbonized particles after the grinding treatment of the insulating shielding layer fracture, the insulating shielding layer and the insulating shielding layer fracture of the first cable 820 will be wrapped with an isolation layer 810 before the first cable 820 passes through the intermediate joint 600 to ensure that the insulating shielding layer and the insulating shielding layer fracture will not come into contact with the intermediate joint 600.

[0049] After the isolation layer 810 wraps the insulation shielding layer break of the first cable 820, the intermediate joint 600 will align the open end with the end to be connected of the first cable 820 and put it on the first cable 820 until the insulation layer of the first cable 820 is exposed from the other end of the intermediate joint 600. At this time, the first cable 820 and the second cable 830 can be docked. After the docking is completed, the intermediate joint 600 is pulled along the first cable 820 toward the second cable 830 until the insulation layer of the first cable 820 and the insulation layer of the second cable 830 are placed in the protection of the intermediate joint 600. In actual operation, the insulation layer parts of the first cable 820 and the second cable 830 used for wiring are completely placed in the protection of the intermediate joint 600.

[0050] After completing the above steps, the installation of the intermediate joint 600 is basically completed, and only the isolation layer 810 needs to be removed from the first cable 820. In actual operation, the isolation layer 810 can be cut open with a special tool and then pulled out from the intermediate joint 600.

[0051] According to the cable intermediate joint installation method of the embodiment of the present invention, during the installation process of the intermediate joint 600, by expanding one end of the intermediate joint 600, it is easy for the first cable 820 to pass through the intermediate joint 600 from the expanded position, reducing the difficulty of the first cable 820 to pass through. By arranging a certain length of the isolation layer 810 on the insulating shielding layer of the first cable 820, it is possible to effectively prevent the decarbonized particles on the insulating shielding layer from falling into the intermediate joint 600. After the first cable 820 and the second cable 830 are connected, the insulating layer of the first cable 820 and the insulating layer of the second cable 830 are pulled into the intermediate joint 600, so that the protective function of the intermediate joint 600 can be fully exerted.

[0052] In some embodiments of the present invention, the isolation layer 810 is a heat shrink tube or a cold shrink tube. The heat shrink tube has the property of heat shrinkage. In actual operation, the heat shrink tube is put on the first cable 820, and then the heat shrink tube is brought into close contact with the first cable 820 by a hot air gun, so that the isolation effect of the isolation layer 810 on the first cable 820 can be ensured. Similarly, in actual operation, the cold shrink tube is put on the first cable 820, and then the skeleton strip in the cold shrink tube is removed, so that the isolation effect of the isolation layer 810 on the first cable 820 can be ensured.

[0053] In some embodiments of the present invention, after the intermediate joint 600 is installed, the lengths of the first cable 820 and the second cable 830 in the intermediate joint 600 are the same. In actual operation, although a certain protection effect can be achieved by pulling the insulation layer of the first cable 820 and the insulation layer of the second cable 830 into the intermediate joint 600, if the connection point of the first cable 820 and the second cable 830 is too close to one side of the intermediate joint 600, the insulation shielding break of the cable on this side will be easily exposed from the intermediate joint 600, which will cause a great hidden danger to the safety of electricity use. By making the lengths of the first cable 820 and the second cable 830 in the intermediate joint 600 the same, the safety of the first cable 820 and the second cable 830 can be protected to the greatest extent.

[0054] In some embodiments of the present invention, the cable intermediate joint installation method further includes the following steps: applying lubricating oil on the outer surface of the isolation layer 810. Applying lubricating oil on the surface of the isolation layer 810 can effectively reduce the friction between the isolation layer 810, the intermediate joint 600 and the first cable 820, making it easier for the isolation layer 810 to enter the intermediate joint 600 and finally be directly pulled out from the intermediate joint 600 and the first cable 820. In addition, the friction between the isolation layer 810 and the expansion portion 200 can also be reduced.

[0055] In some embodiments of the present invention, the cable intermediate joint installation method further comprises the following steps: applying lubricating oil to the outer surface of the first cable 820. Applying lubricating oil to the outer surface of the first cable 820 can reduce the friction between the first cable 820 and the intermediate joint 600. Lubricating oil is usually applied to the outer surface of the isolation layer 810 at the same time, which can further reduce the friction with the intermediate joint 600 to the greatest extent, making the entire installation process smoother.

[0056] In some embodiments of the present invention, the cable intermediate joint installation method further includes the following steps: applying lubricating oil on the outer surface of the second cable 830. By applying lubricating oil on the outer surface of the second cable 830, the resistance when the second cable 830 is pulled into the intermediate joint 600 can be reduced, and the cable can also be protected, effectively preventing the cable from being damaged during the pulling process.

[0057] In some embodiments of the present invention, lubricating oil is also applied to the surfaces of the guide portion 100 and the expansion portion 200. This can firstly effectively reduce the resistance of the guide portion 100 and the expansion portion 200 in opening one end of the intermediate joint 600, and secondly can reduce the subsequent friction between the first cable 820 and the expansion portion 200.

[0058] In some embodiments of the present invention, the cable intermediate joint installation method further comprises the following steps: installing a guide head on the conductor of the first cable 820. By installing the guide head on the conductor of the first cable 820, it is easy for the first cable 820 to penetrate into the intermediate joint 600, reducing the resistance of the first cable 820 when penetrating into the intermediate joint 600, and effectively improving the efficiency of the entire installation. The guide head is specifically installed on the insulating layer of the first cable 820. The shape of the guide head can generally be conical, hemispherical, etc.

[0059] In some embodiments of the present invention, the cable intermediate joint installation method further includes the following steps: connecting the first cable 820 and the second cable 830 using a connecting tube 840. Connecting the first cable 820 and the second cable 830 using the connecting tube 840 can ensure the strength after the connection, facilitate pulling the first cable 820 and the second cable 830, and ensure that the conductivity of the first cable 820 and the second cable 830 will not be weakened after docking. Usually, after the connection using the connecting tube 840, the equalizing sleeve 850 is used to assist the connection, so that the connection can be more reliable.

[0060] In some embodiments of the present invention, the isolation layer 810 is made of polytetrafluoroethylene tape or nylon tape. Nylon and polytetrafluoroethylene are relatively common materials, and are relatively cheap, which is convenient for mass production. At the same time, because the isolation layer 810 itself needs to rub against the intermediate joint 600 and the cable for a long time, it is easy to be damaged, and the use of cheap nylon or polytetrafluoroethylene can effectively reduce the cost. In addition, the surface of the polytetrafluoroethylene tape or nylon tape is also relatively smooth, which can effectively reduce the friction between the isolation layer 810, the intermediate joint 600 and the first cable 820.

[0061] According to the second embodiment of the present invention, the cable intermediate joint expansion device comprises: a guide part 100, an expansion part 200, a first support part 300, a second support part 400, and a tightening part 500. The guide part 100 is used to open one end of the intermediate joint 600; the expansion part 200 is arranged on the outer surface of the guide part 100 and is used to support the opened end of the intermediate joint 600; the first support part 300 is connected to the expansion part 200; the second support part 400 is fastened to the other end of the intermediate joint 600; the tightening part 500, one end of which is connected to the first support part 300 and the other end of which is connected to the second support part 400, is used to tighten the first support part 300 and the second support part 400; the tightening part 500, the first support part 300 and the second support part 400 are used together to assist the expansion part 200 in supporting the opened end of the intermediate joint 600.

[0062] refer to Figure 1-1 to Figure 3-4 , the inner surface of the middle joint 600 is a cylindrical structure. The expansion part 200 is an annular structure that can fit tightly with the tail end of the guide part 100. The expansion part 200 is fixed to the tail end of the guide part 100, so that the guide part 100 and the expansion part 200 become a whole. The whole formed by the guide part 100 and the expansion part 200 is used to support one end of the middle joint 600, and the second support part 400 is fixed to the other end of the middle joint 600. The first support part 300 is connected to the expansion part 200. After the first support part 300 and the second support part 400 are connected by the tightening part 500, a stable pulling force can be formed between the first support part 300 and the second support part 400. Through this pulling force, it can be ensured that after the guide part 100 is removed, one end of the middle joint 600 can still be supported by the expansion part 200, the first support part 300, the second support part 400 and the tightening part 500. After the guide portion 100 is removed, the opened end of the middle joint 600 allows the first cable 820 to pass through easily.

[0063] The following briefly describes the use of the cable intermediate joint expansion device according to the embodiment of the present invention.

[0064] When it is necessary to connect the cables, first assemble the guide part 100, the expansion part 200, and the first support part 300 and select one end to be placed in the guide part 100, and then fix the second support part 400 to the other end of the intermediate joint 600. Then use a hand hoist to slowly bring the whole formed by the guide part 100 and the expansion part 200 into one end of the intermediate joint 600. During the entry process, the inner surface of the entire intermediate joint 600 will be slowly opened until the main part of the expansion part 200 is connected to the intermediate joint 600. Then use the contraction part to temporarily connect the first support part 300 and the second support part 400. After that, remove the guide part 100. At this time, the first cable 820 that has been covered with the isolation layer 810 can be inserted from the open end of the intermediate joint 600 until the connector is exposed at the other end. Finally, complete the connection between the first cable 820 and the second cable 830, and then pull the insulation layer of the first cable 820 and the insulation layer of the second cable 830 into the intermediate joint 600. After the installation is completed, the isolation layer 810, the guide portion 100, the expansion portion 200, the first support portion 300, the second support portion 400, and the tightening portion 500 can be removed.

[0065] According to the cable intermediate joint expansion device of the embodiment of the present invention, one end of the intermediate joint 600 can be expanded through the guide part 100, so that the expansion part 200 has a certain support foundation. Through the expansion part 200, the tightening part 500, the first support part 300 and the second support part 400, the expanded end of the guide part 100 can be continuously supported to ensure that one end of the intermediate joint 600 can still be supported after the guide part 100 is removed, so that the cable can move more smoothly in the intermediate joint 600. Compared with the installation process of the traditional intermediate joint 600, the cable intermediate joint expansion device of the embodiment of the present invention can reduce the difficulty of installation work and improve installation efficiency.

[0066] In some embodiments of the present invention, the guide portion 100 adopts a guide cone. The guide portion 100 has many forms, such as a cone, a hemisphere, etc. In the embodiment of the present invention, the guide portion 100 adopts a guide cone not for guiding the first cable 820, but for better opening the middle joint 600, so the volume of the guide portion 100 will be larger. If a cone is used, one end of the middle joint 600 can be better opened.

[0067] In some embodiments of the present invention, the expansion part 200 uses an expansion tile. The expansion part 200 uses an expansion tile, which can better fit the guide part 100 and better support one end of the intermediate joint 600 after the guide part 100 is removed.

[0068] In some embodiments of the present invention, a plurality of eyebolts 700 are connected to both the first supporting portion 300 and the second supporting portion 400, and the plurality of eyebolts 700 are used to connect the tightening portion 500. Figure 1-1 to Figure 1-3 A plurality of screw holes are provided on both the first support portion 300 and the second support portion 400, and the plurality of screw holes can be used to install a plurality of eye screws 700. The eye screws 700 need to be symmetrically installed on the first support portion 300 and the second support portion 400, so as to ensure the stability of the subsequent tightening portion 500 connecting the first support portion 300 and the second support portion 400.

[0069] In some embodiments of the present invention, the tightening portion 500 is an elastic connecting band. Compared with a rigid connecting material, an elastic connection can be more convenient, and an elastic connection can be more secure.

[0070] In some embodiments of the present invention, the first support part 300 and the second support part 400 both adopt a Hough structure. A Hough structure refers to a structure in which an originally integrated structure is split into two combined structures. If the first support part 300 and the second support part 400 adopt this structure, the first support part 300 and the second support part 400 can be easily disassembled quickly without reducing the stability of the structure itself. The first support part 300 and the second support part 400 are directly fastened with bolts, and the use of bolts can make it easier to disassemble the first support part 300 and the second support part 400 after the installation of the intermediate joint 600 is completed.

[0071] In some embodiments of the present invention, the expansion part 200 adopts a Hough structure. The Hough structure refers to a structure in which an original integrated structure is split into two combined structures. The expansion part 200 adopts this structure, so that the intermediate joint 600 can be supported without reducing the stability of its own structure. In addition, the Hough structure is used to facilitate the disassembly of the expansion part 200.

[0072] In some embodiments of the present invention, the first support part 300 and the second support part 400 are made of metal material. The metal material has good hardness, so that when the tightening part 500 pulls the first support part 300 and the second support part 400 through the eye screw 700, no deformation occurs. In some embodiments of the present invention, the first support part 300 and the second support part 400 are specifically made of stainless steel, aluminum alloy or brass.

[0073] In some embodiments of the present invention, the first support part 300 and the second support part 400 are made of hard non-metallic materials. Considering that the isolation layer 810 needs to be pulled by the first support part 300 and the second support part 400, even when the first support part 300 and the second support part 400 are made of non-metallic materials, it is necessary to select a material with higher hardness.

[0074] In some embodiments of the present invention, the hard non-metallic material is plastic, ceramic, nylon or sintered steel, etc. Nylon or sintered steel is relatively cheap and has high hardness, and is suitable for large-scale production.

[0075] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0076] Although the embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, the present invention is not limited to the above embodiments. Those skilled in the art will understand that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and purpose of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. A method for installing a cable intermediate joint, characterized in that: The following steps are involved: Spread one end of the middle joint and keep it supported; Laying the isolation layer on the insulation shielding layer of the first cable and covering the break of the insulation shielding layer; Aligning the opened end of the intermediate joint with the end to be connected of the first cable, and sleeve the intermediate joint on the first cable until the insulation layer of the first cable is exposed at the other end of the intermediate joint; Connecting the first cable to another second cable that needs to be docked; Pull the middle joint along the first cable toward the second cable until the insulation layer of the second cable enters the middle joint; The insulating layer is removed from the first cable.

2. The cable intermediate joint installation method according to claim 1, characterized in that: The isolation layer is a heat shrink tube or a cold shrink tube.

3. The cable intermediate joint installation method according to claim 1, characterized in that: After the intermediate joint is installed, the first cable and the second cable have the same length in the intermediate joint.

4. The cable intermediate joint installation method according to claim 1, characterized in that: The following steps are also included: Apply lubricating oil to the outer surface of the isolation layer.

5. The cable intermediate joint installation method according to claim 1, characterized in that: The following steps are also included: The first cable and the second cable are connected using a connecting tube.

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