Drawing head for smooth aluminum sleeve cable

Abstract

The utility model discloses a drawing head for a smooth aluminum sleeve cable, which comprises a body, the body is used for being fixed with the end part of the cable so as to draw the cable to move, the body comprises a drawing cap and a drawing pressure joint, the cable comprises a conductor, an insulating layer and a smooth aluminum sleeve from inside to outside, and the end part of the conductor is inserted into the drawing pressure joint to be fixed. The end of the insulating layer and the end of the smooth aluminum sleeve abut against one end of the traction pressing head, the smooth aluminum sleeve is fixedly welded to one end of the traction pressing head, and one end of the traction cap is provided with internal threads used for being in threaded connection with the traction pressing head and an extension sleeve used for being fixedly welded to the smooth aluminum sleeve. The traction head for the smooth aluminum sleeve cable can effectively improve the fixed connection strength between the traction head and the smooth aluminum sleeve cable so as to ensure the traction stability of the traction head to the smooth aluminum sleeve cable.

Description

Technical Field

[0001] The utility model relates to the field of cable traction equipment, and specifically relates to a traction head for smooth aluminum-sheathed cables. Background Art

[0002] In recent years, buffer layer ablation faults frequently occur in corrugated aluminum-sheathed XLPE cables, posing a serious threat to line reliability and grid security. Undoubtedly, poor electrical contact between the corrugated aluminum sheath and the insulation shield is one of the important reasons for triggering faults.

[0003] To avoid the situation of poor electrical contact between the corrugated aluminum sheath and the insulation shield, by adopting a smooth aluminum-sheath structure, the contact mode between the aluminum sheath and the semi-conductive buffer layer is changed, the possibility of local current concentration is avoided, and thus the occurrence of faults is avoided. When the cable is laid and installed, the cable needs to be pulled to a specified position through a traction head. Among them, due to the corrugated design of the corrugated aluminum-sheath cable, the corrugated aluminum-sheath cable is more firmly fixed to the traction head, not easily loosened, and is easy to be towed. However, because the smooth aluminum-sheath cable has no corrugated design, it is easy to loosen when being towed by the traction head, so it is not conducive to the rapid laying and installation of the smooth aluminum-sheath cable. Summary of the Invention

[0004] The technical problem to be solved by the utility model is to provide a traction head for smooth aluminum-sheath cables that can effectively improve the fixed connection strength between the traction head and the smooth aluminum-sheath cable to ensure the traction stability of the traction head for the smooth aluminum-sheath cable.

[0005] The technical solution adopted by the utility model to solve the above problems is: a traction head for smooth aluminum-sheath cables, including a body. The body is used for fixing to the end of the cable to tow the cable to move. The body includes a traction cap and a traction compression joint. The cable includes a conductor, an insulating layer, and a smooth aluminum sheath from the inside to the outside. The end of the conductor is inserted into the traction compression joint for fixation. The ends of the insulating layer and the smooth aluminum sheath abut against one end of the traction compression joint, and the smooth aluminum sheath is welded and fixed to one end of the traction compression joint. One end of the traction cap is provided with an internal thread for threaded connection with the traction compression joint and an extension sleeve for welding and fixing with the smooth aluminum sheath.

[0006] Compared with the prior art, the advantages of the present utility model are as follows: First, the end of the conductor is inserted into the traction compression joint for fixation, realizing the fixed connection on the axis of the cable, ensuring the force stability of the cable traction by the traction compression joint, and making it not easy to occur the situation of skewed force. Then, the design that the end of the insulating layer and the end of the smooth aluminum sleeve abut against one end of the traction compression joint can ensure the comprehensiveness and tightness of the connection between the cable and the traction compression joint, reduce the probability of stress concentration phenomenon, and further reduce the probability of connection deformation when the traction head pulls the cable. The design of welding and fixing the smooth aluminum sleeve and the traction compression joint can realize the fixed connection in the circumferential direction of the cable. Combining with the fixed connection of the traction compression joint to the conductor, the traction compression joint can achieve the all-round fixed connection of the cable, ensuring the connection strength between the traction compression joint and the cable. At the same time, the traction cap is fixedly connected with the traction compression joint by thread to form a whole and is also welded and fixed with the smooth aluminum sleeve, further strengthening the fixed connection strength between the traction head and the smooth aluminum sleeve. It is equivalent to setting two layers of welding fixation on the smooth aluminum sleeve for the traction head, greatly improving the fixed connection strength between the traction head and the cable and ensuring the traction stability of the traction head for the cable.

[0007] As an improvement of the present utility model, the traction compression joint includes a crimping section, a threaded fixing section and an abutting section. The threaded fixing section is arranged between the crimping section and the abutting section. The crimping section is used for fixing the conductor inserted into the traction compression joint. The threaded fixing section is used for fixed connection with the internal thread. One end of the abutting section is used for abutting against the insulating layer and the smooth aluminum sleeve, and one end of the abutting section is welded and fixed with the smooth aluminum sleeve. The other end of the abutting section is used for abutting against the end of the internal thread. Through the above improvement, the fixed connection between the traction compression joint and the conductor is realized through the design of the crimping section, the fixed connection between the traction compression joint and the traction cap is realized through the design of the threaded fixing section, and the limit of the threaded connection between the traction compression joint and the traction cap and the abutting between the traction compression joint and the insulating layer and the smooth aluminum sleeve are realized through the design of the abutting section.

[0008] As an improvement of the present utility model, an insertion hole for inserting the conductor is provided on the axis of the traction compression joint. After the conductor is inserted into the insertion hole, the crimping section forms a crimping mark for fixing the conductor through a press. Through the above improvement, the crimping and fixing of the crimping section to the conductor is realized.

[0009] As an improvement of the present utility model, the inner diameter of the insertion hole is 1-2 mm larger than the wire diameter of the conductor. Through the above improvement, it is convenient for the conductor to be smoothly inserted into the insertion hole.

[0010] As an improvement of the utility model, a water-blocking groove is provided at the insertion end of the insertion hole, and a water-blocking tape is wound around the conductor in the water-blocking groove. Through this improvement, during the process of pulling the cable, the cable needs to pass through areas such as pipelines and tunnels. If there is water in the pipeline or tunnel, and in the extreme case where the traction head is severely damaged by external mechanical force and the welding point is damaged, the design of the water-blocking groove and the water-blocking tape can prevent water from further spreading in the conductor, buying time for emergency repair.

[0011] As an improvement of the utility model, a gap is provided between the extension sleeve and the abutting section. The gap is used to avoid the solder joint between the abutting section and the smooth aluminum sleeve. The end of the extension sleeve away from the internal thread is bent inward to approach the smooth aluminum sleeve for welding and fixing. Through this improvement, the design of the gap enables the extension sleeve to successfully avoid the solder joint between the abutting section and the smooth aluminum sleeve, preventing the problem of jamming during the process of sleeving the extension sleeve over the outer layer of the smooth aluminum sleeve. At the same time, the welding of the end of the extension sleeve away from the internal thread to the smooth aluminum sleeve realizes the welding and fixing of the traction cap and the smooth aluminum sleeve.

[0012] As an improvement of the utility model, the outer diameters of both the traction cap body and the smooth aluminum sleeve are smaller than the outer diameter of the extension sleeve. A heat shrinkable tube is wrapped around the outer layer of the extension sleeve. One end of the heat shrinkable tube is wrapped around the traction cap body, and the other end of the heat shrinkable tube is wrapped around the smooth aluminum sleeve. Through this improvement, the heat shrinkable tube forms an axially limiting wrapping layer at the welding joint between the extension sleeve and the smooth aluminum sleeve, which can not only increase the fixed connection strength between the traction head and the cable, but also protect the solder joint between the extension sleeve and the smooth aluminum sleeve, ensuring the welding strength between the extension sleeve and the smooth aluminum sleeve.

[0013] As an improvement of the utility model, an insulating and waterproof tape is provided on the inner layer of the heat shrinkable tube, and the insulating and waterproof tape covers the connection between the extension sleeve and the smooth aluminum sleeve. Through this improvement, moisture infiltration at the welding joint between the extension sleeve and the smooth aluminum sleeve can be prevented to ensure the quality of the cable. Description of the Drawings

[0014] Figure 1 It is a schematic cross-sectional structure diagram of the whole utility model.

[0015] As shown in the figure: 1. Traction cap, 1.1. Internal thread, 1.2. Extension sleeve, 2. Traction press joint, 2.1. Crimping section, 2.1.1. Indentation, 2.2. Thread fixing section, 2.3. Abutting section, 2.4. Insertion hole, 3. Cable, 3.1. Conductor, 3.2. Insulation layer, 3.3. Smooth aluminum sleeve, 4. Water-blocking tape, 5. Gap, 6. Heat shrinkable tube, 7. Insulating and waterproof tape, 8. Abutting solder joint, 9. Extension solder joint. Detailed Embodiment

[0016] The embodiments of the present utility model will be further described below in conjunction with the drawings.

[0017] As Figure 1 shown, a traction head for smoothing an aluminum-sheathed cable includes a body for fixing to the end of the cable 3 to tow the cable 3 for movement. The body includes a traction cap 1 and a traction crimping joint 2. The cable 3 includes a conductor 3.1, an insulating layer 3.2, and a smoothing aluminum sheath 3.3 from inside to outside. The end of the conductor 3.1 is inserted into the traction crimping joint 2 for fixation. The ends of the insulating layer 3.2 and the smoothing aluminum sheath 3.3 abut against one end of the traction crimping joint 2, and the smoothing aluminum sheath 3.3 is fixedly welded to one end of the traction crimping joint 2. One end of the traction cap 1 is provided with an internal thread 1.1 for threaded connection with the traction crimping joint 2 and an extension sleeve 1.2 for fixedly welding with the smoothing aluminum sheath 3.3.

[0018] The traction crimping joint 2 includes a crimping section 2.1, a threaded fixing section 2.2, and an abutting section 2.3. The threaded fixing section 2.2 is arranged between the crimping section 2.1 and the abutting section 2.3. The crimping section 2.1 is used for fixing the conductor 3.1 inserted into the traction crimping joint 2. The threaded fixing section 2.2 is used for fixedly connecting with the internal thread 1.1. One end of the abutting section 2.3 is used for abutting against the insulating layer 3.2 and the smoothing aluminum sheath 3.3, and one end of the abutting section 2.3 is fixedly welded to the smoothing aluminum sheath 3.3 to form an abutting solder joint 8. The other end of the abutting section 2.3 is used for abutting against the end of the internal thread 1.1. An insertion hole 2.4 for inserting the conductor 3.1 is provided on the axis of the traction crimping joint 2. After the conductor 3.1 is inserted into the insertion hole 2.4, the crimping section 2.1 forms a crimp 2.1.1 for fixing the conductor 3.1 through a press. The crimp 2.1.1 is annular and there are multiple ones arranged along the axis of the crimping section 2.1. The inner diameter of the insertion hole 2.4 is 1-2 mm larger than the wire diameter of the conductor 3.1. A water-blocking groove is provided at the insertion end of the insertion hole 2.4, and a water-blocking tape 4 is wound around the conductor 3.1 in the water-blocking groove.

[0019] A gap 5 is provided between the extension sleeve 1.2 and the abutting section 2.3. The gap 5 is used to avoid the abutting solder joint 8. One end of the extension sleeve 1.2 away from the internal thread 1.1 is bent inward to approach the smoothing aluminum sheath 3.3 for fixed welding to form an extension solder joint 9. The outer diameter of the main body of the traction cap 1 and the outer diameter of the smoothing aluminum sheath 3.3 are both smaller than the outer diameter of the extension sleeve 1.2. A heat shrinkable tube 6 is wrapped around the outer layer of the extension sleeve 1.2. One end of the heat shrinkable tube 6 is wrapped on the main body of the traction cap 1, and the other end of the heat shrinkable tube 6 is wrapped on the smoothing aluminum sheath 3.3. An insulating and waterproof tape 7 is provided on the inner layer of the heat shrinkable tube 6, and the insulating and waterproof tape 7 covers the extension solder joint 9.

[0020] After completing the welding of the extended solder joint 9, successively sleeved with the insulating waterproof tape 7 and the heat shrinkable tube 6, and then heated the heat shrinkable tube 6 with a hot air gun, so that the heat shrinkable tube 6 is heat-shrunk in diameter and covered on the traction cap 1, the insulating waterproof tape 7 and the smooth aluminum sleeve 3.3.

[0021] During use, the waterproof tape is the fourth layer of waterproof measure for the conductor 3.1. If water wants to penetrate into the conductor 3.1, it first needs to damage the insulating waterproof tape 7, the extended solder joint 9 and the abutting solder joint 8 before it can penetrate, and then the waterproof tape is used to enable the waterproof function.

[0022] Through the design of the traction head for the cable 3 of the smooth aluminum sleeve 3.3, and the crimping and fixing of the conductor 3.1 by the crimping section 2.1, the fixed connection on the axis of the cable 3 is realized, ensuring the force stability of the traction of the cable 3 by the traction crimping head 2 and not easily occurring the situation of uneven force; through the design that the end of the insulating layer 3.2 and the end of the smooth aluminum sleeve 3.3 abut against the abutting section 2.3, the connection comprehensiveness and tightness of the cable 3 and the traction crimping head 2 can be ensured, reducing the probability of stress concentration phenomenon, and further reducing the probability of connection deformation when the traction head pulls the cable 3. The design of welding and fixing the smooth aluminum sleeve 3.3 and the abutting section 2.3 can realize the fixed connection in the circumferential direction of the cable 3. Combining with the fixed connection of the conductor 3.1 by the crimping section 2.1, the traction crimping head 2 can realize the all-round fixed connection of the cable 3, ensuring the connection strength between the traction crimping head 2 and the cable 3. At the same time, the traction cap 1 is threadedly connected and fixed with the traction crimping head 2 to form a whole and is also welded and fixed with the smooth aluminum sleeve 3.3, further strengthening the fixed connection strength between the traction head and the smooth aluminum sleeve 3.3. It is equivalent to setting two layers of welding and fixing on the smooth aluminum sleeve 3.3 for the traction head, greatly improving the fixed connection strength between the traction head and the cable 3 and ensuring the traction stability of the traction head for the cable 3.

[0023] The above only explains the best embodiments of the present invention, but it cannot be understood as a limitation to the claims. The present invention is not limited to the above embodiments, and its specific structure is allowed to change. All changes made within the protection scope of the independent claims of the present invention are within the protection scope of the present invention.

Claims

1. A traction head for smoothing aluminum-sheathed cables, comprising a body for fixing to the end of a cable (3) to traction the cable (3) to move, characterized in that: The body includes a traction cap (1) and a traction crimping joint (2). The cable (3) includes a conductor (3.1), an insulating layer (3.2), and a smooth aluminum sleeve (3.3) from the inside out. The end of the conductor (3.1) is inserted into the traction crimping joint (2) for fixation. The ends of the insulating layer (3.2) and the smooth aluminum sleeve (3.3) abut against one end of the traction crimping joint (2), and the smooth aluminum sleeve (3.3) is welded and fixed to one end of the traction crimping joint (2). One end of the traction cap (1) is provided with an internal thread (1.1) for threaded connection with the traction crimping joint (2) and an extension sleeve (1.2) for welded fixation with the smooth aluminum sleeve (3.3).

2. The traction head for smoothing aluminum-sheathed cables according to claim 1, wherein: The traction crimping joint (2) includes a crimping section (2.1), a threaded fixing section (2.2), and an abutting section (2.3). The threaded fixing section (2.2) is arranged between the crimping section (2.1) and the abutting section (2.3). The crimping section (2.1) is used for fixing the conductor (3.1) inserted into the traction crimping joint (2). The threaded fixing section (2.2) is used for fixed connection with the internal thread (1.1). One end of the abutting section (2.3) is used for abutting against the insulating layer (3.2) and the smooth aluminum sleeve (3.3), and one end of the abutting section (2.3) is welded and fixed to the smooth aluminum sleeve (3.3). The other end of the abutting section (2.3) is used for abutting against the end of the internal thread (1.1).

3. The traction head for smoothing aluminum-sheathed cables according to claim 2, characterized in that: An insertion hole (2.4) for inserting the conductor (3.1) is provided on the axis of the traction crimping joint (2). After the conductor (3.1) is inserted into the insertion hole (2.4), the crimping section (2.1) forms an indentation (2.1.1) for fixing the conductor (3.1) through a press.

4. The traction head for smoothing aluminum-sheathed cables according to claim 3, characterized in that: The inner diameter of the insertion hole (2.4) is 1 - 2 mm larger than the wire diameter of the conductor (3.1).

5. The traction head for smoothing aluminum-sheathed cables according to claim 4, characterized in that: A water blocking groove is provided at the insertion end of the insertion hole (2.4), and a water blocking tape (4) is wound around the conductor (3.1) in the water blocking groove.

6. The traction head for smoothing aluminum-sheathed cables according to claim 2, wherein: A gap (5) is provided between the extension sleeve (1.2) and the abutting section (2.3). The gap (5) is used to avoid the solder joint between the abutting section (2.3) and the smooth aluminum sleeve (3.3). One end of the extension sleeve (1.2) away from the internal thread (1.1) is bent inward to approach the smooth aluminum sleeve (3.3) for welded fixation.

7. The traction head for smoothing aluminum sheathed cables according to claim 6, wherein: The outer diameter of the main body of the traction cap (1) and the outer diameter of the smooth aluminum sleeve (3.3) are both smaller than the outer diameter of the extension sleeve (1.2). A heat shrinkable tube (6) is wrapped around the outer layer of the extension sleeve (1.2). One end of the heat shrinkable tube (6) is wrapped around the main body of the traction cap (1), and the other end of the heat shrinkable tube (6) is wrapped around the smooth aluminum sleeve (3.3).

8. A traction head for smoothing aluminum-sheathed cables according to claim 7, characterized in that: An insulating waterproof tape (7) is provided on the inner layer of the heat shrinkable tube (6), and the insulating waterproof tape (7) covers the connection between the extension sleeve (1.2) and the smooth aluminum sleeve (3.3).

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