Cross-linked polyethylene insulated power cable for mine

Abstract

The invention relates to the technical field of power cables, and provides a mine cross-linked polyethylene insulated power cable which comprises a cable body, the cable body comprises a plurality of conductors which are arranged in a stranded mode, each conductor is coated with a cross-linked polyethylene insulating layer, a filling layer is arranged outside the plurality of conductors, and the cross-linked polyethylene insulating layer is arranged outside the filling layer. The cable further comprises a protection layer, an outer sheath, a connection assembly and a buffer protection assembly, the protection layer wraps the filling layer, the outer sheath wraps the protection layer, the connection assembly is installed between the two sections of cable bodies, the buffer protection assembly is installed between the two sections of cable bodies, the protection layer comprises an inner sheath and an armor layer, and the inner sheath wraps the armor layer. According to the technical scheme, the cable for the mine solves the problem that in the prior art, a cable laid under the mine is prone to mechanical collision during construction or operation in the mine, and consequently the cable and the connecting position of the cable are prone to damage.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power cable, in particular to a cross-linked polyethylene insulated power cable for mine. BACKGROUND

[0002] Cross-linked polyethylene insulated power cable is a kind of cable material widely used in power transmission field, which has good insulation performance and can work stably at high voltage, and is suitable for power transmission and distribution lines in various power systems. Compared with ordinary polyethylene, cross-linked polyethylene has better stability and durability at high temperature, and can be installed and used in complex environment, and is widely used in industrial fields such as mines and factories.

[0003] Because the mine environment is narrow and complex, when construction or operation is carried out in the mine, the power cable will be mechanically damaged, such as being collided, crushed or broken by mining machinery, and being crushed or broken by construction process, which will cause the power cable to be damaged or even broken, especially the joint position of the cable, which is more easily affected by mechanical damage. Because the laying method of the power cable is various, the number of cable joints is also large, so that the power cable is more likely to fail during use. SUMMARY

[0004] The present application provides a cross-linked polyethylene insulated power cable for mine, which solves the problem that the cable laid in the mine is easily damaged by mechanical collision during construction or operation in the mine.

[0005] The technical scheme of the present application is as follows: A cross-linked polyethylene insulated power cable for mine, comprising a cable body, the cable body comprising a plurality of conductors arranged in a twisted manner, each conductor being externally covered with a cross-linked polyethylene insulation layer, and a plurality of conductors being externally provided with a filling layer, further comprising: a protective layer, the filling layer being externally covered with a protective layer for protecting the conductors; an outer sheath, the outer sheath being externally covered with the protective layer; a connecting assembly, the connecting assembly being installed between two segments of the cable body, for one-to-one correspondence and communication of a plurality of conductors between the two segments of the cable body; a buffer protection assembly, the buffer protection assembly being installed between two segments of the cable body, the buffer protection assembly being externally located on the connecting assembly, for protecting the connecting assembly.

[0006] On the basis of the foregoing scheme, the protective layer comprises: An inner sheath is arranged outside the filling layer, and a buffer layer is arranged inside the inner sheath. An armored layer is arranged between the inner sheath and the outer sheath.

[0007] The buffer layer is arranged by winding an elastic band, and the buffer layer is in contact with the filling layer.

[0008] On the basis of the foregoing scheme, the connecting assembly comprises: A wiring terminal is fixedly installed between each two corresponding conductors. A wiring sheath is arranged outside each wiring terminal, and the inner side of the wiring sheath is arranged on the corresponding cross-linked polyethylene insulation layer. A buffer block is arranged between the plurality of wiring terminals.

[0009] On the basis of the foregoing scheme, the buffer protection assembly comprises: A waterproof belt is arranged on the outer sheath outside the two cable bodies, and the waterproof belt is located at one end of the outer sheath close to the wiring terminal. A first heat-shrinkable sheath is arranged at the connection position of the two cable bodies, and the two ends of the first heat-shrinkable sheath are in abutment with the two waterproof belts. A buffer portion is installed outside the first heat-shrinkable sheath and is used for protecting the connection position of the two cable bodies. A positioning portion is installed on the two cable bodies and is used for supporting the buffer portion. A second heat-shrinkable sheath is arranged outside the buffer portion, and the two ends of the second heat-shrinkable sheath are in abutment with the outer sheath.

[0010] On the basis of the foregoing scheme, the buffer portion comprises: A buffer shell is sleeved on the outer sheath in the cable body, and the buffer shell is located at the connection position of the two cable bodies, and the two ends of the buffer shell are arranged in a tapered structure. An air bag is fixedly installed inside the buffer shell, and the end portion of the buffer shell is provided with a one-way joint in communication with the air bag.

[0011] On the basis of the foregoing scheme, the positioning portion comprises: Positioning rings, the outer sheaths of the two sections of the cable body are both provided with positioning rings, and the two positioning rings are respectively in contact with the tapered structures at both ends of the buffer shell; Wherein, the positioning ring consists of two half rings.

[0012] The working principle and beneficial effects of the present invention are: 1. In the present invention, when the cable body is mechanically damaged, such as being collided, crushed or torn by mining machinery, or when the power cable is smashed or crushed during construction, the provision of the airbag can effectively disperse the impact of the force acting on the joint parts of the cable body at both ends when collisions and smashes occur, thereby improving the quality of the cable body.

[0013] 2. In the present invention, the buffer layer inside the inner sheath is formed by winding an elastic band. When the cable is subjected to external collision or extrusion, the buffer layer plays a buffering role, thereby reducing damage to the internal conductor and the cross-linked polyethylene insulation layer. Combined with the setting of the armor layer, the mechanical strength of the cable body and the ability to resist external mechanical damage are enhanced, thereby reducing the occurrence of the cable being collided, flattened or torn by mining machinery.

[0014] 3. In the present invention, the provision of a protective layer improves the ability of the cable body to resist mechanical damage such as collision and extrusion when facing a complex mine environment. Through the cooperation of the buffer protection component and the connection component, when the joint position of the cable body is collided or smashed, the impact force generated by the collision is dispersed, thereby reducing the impact on the joint part of the cable body and improving the stability of the connection position of the two sections of the cable body. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of a three-dimensional structure of a cross-section in the present invention; Figure 3 It is a schematic cross-sectional structural diagram of the connection component and the first heat shrinkable sheath in the present invention; Figure 4 Schematic diagram of the cross-sectional structure of the connection assembly in the present invention; Figure 5 Schematic diagram of the cross-sectional structure of the buffer protection component of the present invention; Figure 6 For the present invention Figure 5 Schematic diagram of the locally enlarged structure at point A in the middle.

[0017] In the figure: 1. Conductor; 2. Cross-linked polyethylene insulation layer; 3. Filling layer; 4. Outer sheath; 5. Inner sheath; 6. Buffer layer; 7. Armor layer; 8. Terminal block; 9. Wiring sheath; 10. Buffer block; 11. Waterproof tape; 12. First heat shrink sheath; 13. Second heat shrink sheath; 14. Buffer shell; 15. Airbag; 16. One-way joint; 17. Positioning ring. DETAILED DESCRIPTION

[0018] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0019] like Figures 1 to 6 As shown, this embodiment proposes a cross-linked polyethylene insulated power cable for mines, including a cable body, the cable body including a plurality of conductors 1 arranged in a twisted arrangement, each conductor 1 is coated with a cross-linked polyethylene insulation layer 2, a filling layer 3 is provided on the outside of the plurality of conductors 1, and further includes a protective layer, an outer sheath 4, a connection component and a buffer protection component, the filling layer 3 is coated with a protective layer for protecting the conductor 1, the protective layer includes an inner sheath 5 and an armor layer 7, the inner sheath 5 is coated on the outside of the filling layer 3, and a buffer layer 6 is provided inside the inner sheath 5, wherein the buffer layer 6 is formed by winding an elastic band, the buffer layer 6 is in contact with the filling layer 3, and the inner sheath 5 is in contact with the outer sheath 4 is provided with an armor layer 7, the outer sheath 4 is covered and provided on the outside of the protective layer, the connecting component is installed between the two sections of the cable body, and is used to connect the several conductors 1 between the two sections of the cable body one by one, and the connecting component includes a terminal 8, a wiring sheath 9 and a buffer block 10. The several conductors 1 at the connecting end of the two sections of the cable body correspond one to one, and a terminal 8 is fixedly installed between every two corresponding conductors 1. The outside of each terminal 8 is covered with a wiring sheath 9, and the two sections inside the wiring sheath 9 are respectively covered on the corresponding cross-linked polyethylene insulation layer 2. A buffer block 10 is provided between the several terminals 8, and the buffer block 10 is made of flexible material.

[0020] Specifically, in the process of laying the power cable, when the two ends of the cable need to be connected, the first heat shrinkable sheath 12, the buffer shell 14 and the second heat shrinkable sheath 13 are sequentially sleeved outside one of the cable bodies, then the end of the cable is broken and disassembled to expose the plurality of conductors 1 at the end of the two connected cables, then the plurality of conductors 1 are correspondingly arranged, the cross-linked polyethylene insulation layer 2 outside the conductor 1 is disassembled, and the wiring sheath 9 is sleeved on the cross-linked polyethylene insulation layer 2 outside one of the conductors 1. At this time, through the arrangement of the wiring terminal 8, the two corresponding conductors 1 on the two cable bodies are connected together, then the wiring sheath 9 is moved to the wiring terminal 8, the wiring sheath 9 is heated until the wiring sheath 9 is wrapped around the wiring terminal 8, and the above steps are repeated until all the wires are connected. Then the buffer block 10 is placed between the plurality of wiring terminals 8, the buffer block 10 is in contact with the wiring sheath 9, then the buffer protection assembly is installed, and the connection of the two cable bodies is completed. During the use of the cable body, the buffer protection assembly can protect the cable body.

[0021] As shown in Figure 5 , Figure 6 The buffer protection assembly is installed between the two cable bodies, and the buffer protection assembly is located outside the connecting assembly for protecting the connecting assembly. The buffer protection assembly includes a waterproof belt 11, a first heat shrinkable sheath 12, a buffer part, a positioning part and a second heat shrinkable sheath 13. The waterproof belt 11 is wound on the outer sheath 4 outside the two cable bodies, and the waterproof belt 11 is located at one end of the outer sheath 4 close to the wiring terminal 8. The first heat shrinkable sheath 12 is wrapped around the connecting position of the two cable bodies, and the two sections inside the first heat shrinkable sheath 12 abut against the two waterproof belts 11. The buffer part is installed outside the first heat shrinkable sheath 12 for protecting the connecting position of the two cable bodies. The positioning part is installed on the two cable bodies for supporting the buffer part. The second heat shrinkable sheath 13 is wrapped around the outside of the buffer part, and the two ends inside the second heat shrinkable sheath 13 abut against the outer sheath 4.

[0022] Specifically, after the connection of the plurality of conductors 1 is completed, the waterproof belt 11 is installed at the end of the two cables, then the first heat shrinkable sheath is moved to the connecting position of the two cable bodies, and then the first heat shrinkable sheath 12 is heated to wrap all the wiring terminals 8. Then the buffer shell 14 is moved outside the first heat shrinkable sheath 12, and then the positioning part is installed to fix the position of the buffer shell 14. Then the buffer part is opened until the buffer part wraps the first heat shrinkable sheath 12, and then the second heat shrinkable sheath 13 is moved outside the buffer shell 14. Then the second heat shrinkable sheath 13 is heated until the second heat shrinkable sheath 13 wraps the buffer shell 14.

[0023] The above, asFigure 5 、 Figure 6 As shown, the buffer part includes a buffer shell 14 and an airbag 15. The buffer shell 14 is sleeved on the outer sheath 4 in the cable body. The buffer shell 14 is located at the connection position of the two sections of the cable body. The two ends of the buffer shell 14 are set to a conical structure. The airbag 15 is fixedly installed inside the buffer shell 14. The end of the buffer shell 14 is provided with a one-way joint 16, which is connected to the airbag 15.

[0024] Specifically, when the buffer shell 14 is moved to the outside of the first heat shrinkable sheath 12, the inflation device is connected to the one-way joint 16. At this time, the inflation device is turned on, and air is inflated into the airbag 15 through the one-way joint 16 until the airbag 15 abuts against the first heat shrinkable sheath 12, the waterproof tape 11 and other parts and reaches the set air pressure. Then, the inflation device can be closed and disconnected, and then the inflation device is removed, and the mounting cap for protecting the one-way joint 16 can be installed on the one-way joint 16.

[0025] When the cable body is mechanically damaged, such as being collided, crushed or torn by mining machinery, or when the power cable is smashed or crushed during construction, the setting of the airbag 15 can effectively disperse the force acting on the joint parts of the cable body at both ends when collisions, smashes, etc. occur, thereby improving the quality of the cable body.

[0026] The above, such as Figure 5 As shown, the positioning portion includes a positioning ring 17. The outer sheaths 4 of the two cable bodies are both provided with positioning rings 17. The two positioning rings 17 are respectively in contact with the tapered structures at both ends of the buffer shell 14. The positioning ring 17 is composed of two half rings.

[0027] Specifically, after the buffer shell 14 is moved to the outside of the first heat shrinkable sheath 12, in order to fix the position of the buffer shell 14, a positioning ring 17 is installed on the outer sheath 4 of the two sections of the cable body respectively. The positioning ring 17 consists of two symmetrically arranged half rings. During installation, the two half rings are placed on both sides of the cable body, and then the two half rings are docked together to form a positioning ring 17. Then, the end of the positioning ring 17 is pushed to abut against the conical structure at both ends of the buffer shell 14 to play a positioning role. After the second heat shrinkable sheath 13 is installed, the circumferential position of the positioning ring 17 can be fixed.

[0028] The working principle or usage process of this application is as follows: In the process of laying power cable, when the two ends of the cable need to be connected, the first heat shrinkable sheath 12, the buffer shell 14 and the second heat shrinkable sheath 13 are sequentially sleeved outside one of the cable bodies, then the end of the cable is broken and disassembled to expose the plurality of conductors 1 at the end of the two connected cables, then the plurality of conductors 1 are correspondingly arranged, the cross-linked polyethylene insulation layer 2 outside the conductor 1 is disassembled, and the wiring sheath 9 is sleeved on the cross-linked polyethylene insulation layer 2 outside one of the conductors 1. At this time, the two corresponding conductors 1 on the two cable bodies are connected through the setting of the wiring terminal 8, then the wiring sheath 9 is moved to the wiring terminal 8, the wiring sheath 9 is heated until the wiring sheath 9 is wrapped on the wiring terminal 8, and the above steps are repeated until all the wires are connected, then the buffer block 10 is placed between the plurality of wiring terminals 8, and the buffer block 10 is in contact with the wiring sheath 9.

[0029] After the connection of the plurality of conductors 1 is completed, the waterproof belt 11 is installed at the end of the two cables, then the first heat shrinkable sheath is moved to the connection position of the two cable bodies, then the first heat shrinkable sheath 12 is heated to wrap all the wiring terminals 8, then the buffer shell 14 is moved outside the first heat shrinkable sheath 12, at this time, the first heat shrinkable sheath 12 is located inside the buffer shell 14 and has a certain distance, at this time, in order to fix the position of the buffer shell 14, the positioning ring 17 is installed on the outer sheath 4 of the two cable bodies, the positioning ring 17 is composed of two symmetrical half rings, during installation, the two half rings are placed on both sides of the cable body, then the two half rings are butt-jointed to form the positioning ring 17, then the end of the positioning ring 17 is pushed to abut against the tapered structure at both ends of the buffer shell 14, so as to play a positioning role.

[0030] Then the inflation device is connected to the one-way joint 16, at this time, the inflation device is started, the one-way joint 16 is inflated into the air bag 15, until the air bag 15 abuts against the first heat shrinkable sheath 12, the waterproof belt 11 and other parts and reaches the set air pressure, then the inflation device is closed and disconnected, then the inflation device is removed, the installation cap for protecting the one-way joint 16 is installed on the one-way joint 16, then the second heat shrinkable sheath 13 is moved outside the buffer shell 14, the second heat shrinkable sheath 13 is heated until the second heat shrinkable sheath 13 wraps the buffer shell 14, until the second heat shrinkable sheath 13 is installed, the circumferential position of the positioning ring 17 is fixed.

[0031] When the cable body is mechanically damaged, such as being collided by excavating machinery, being crushed or being broken, and being hit or crushed during construction, the air bag 15 can effectively disperse the force acting on the joint part of the cable body when the collision or hit occurs, and reduce the influence of the force acting on the joint part of the cable body on the joint part of the cable body. At the same time, the buffer layer 6 and the buffer block 10 wound by the elastic belt can play a buffering role when the cable body is collided or hit, thereby reducing the possibility of failure of the cable body during use.

[0032] The above is only the preferred embodiment of the present application, and is not used to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A cross-linked polyethylene insulated power cable for use in mines, comprising a cable body, wherein the cable body comprises a plurality of conductors (1) arranged in a twisted arrangement, each of the conductors (1) being coated with a cross-linked polyethylene insulation layer (2), and a plurality of the conductors (1) being coated with a filling layer (3), wherein: Also includes: A protective layer, the filling layer (3) is externally coated with the protective layer for protecting the conductor (1); An outer sheath (4), the outer sheath (4) being arranged to cover the outside of the protective layer; A connecting assembly, the connecting assembly being installed between two sections of the cable body and used to connect the plurality of conductors (1) between the two sections of the cable body in a one-to-one correspondence; A buffer protection component is installed between two sections of the cable body. The buffer protection component is located outside the connecting component and is used to protect the connecting component.

2. A cross-linked polyethylene insulated power cable for mines according to claim 1, characterized in that: The protective layer comprises: An inner sheath (5), the inner sheath (5) being arranged to cover the outside of the filling layer (3), and a buffer layer (6) being arranged inside the inner sheath (5); An armor layer (7), wherein the armor layer (7) is provided between the inner sheath (5) and the outer sheath (4).

3. A cross-linked polyethylene insulated power cable for mines according to claim 2, characterized in that: The buffer layer (6) is formed by winding an elastic band, and the buffer layer (6) is in contact with the filling layer (3).

4. A cross-linked polyethylene insulated power cable for mines according to claim 3, characterized in that: The connection component includes: A wiring terminal (8), corresponding one to one to the plurality of conductors (1) at the connection ends of the two sections of the cable body, with the wiring terminal (8) being fixedly installed between every two corresponding conductors (1); A wiring sheath (9), wherein the exterior of each wiring terminal (8) is covered with the wiring sheath (9), and two sections of the interior of the wiring sheath (9) are respectively covered on the corresponding cross-linked polyethylene insulation layer (2); A buffer block (10) is provided between a plurality of the connection terminals (8).

5. A cross-linked polyethylene insulated power cable for mines according to claim 4, characterized in that: The buffer protection component includes: A waterproof tape (11), the outer sheath (4) outside the two sections of the cable body is wrapped with the waterproof tape (11), and the waterproof tape (11) is located at one end of the outer sheath (4) close to the wiring terminal (8); a first heat shrinkable sheath (12), the first heat shrinkable sheath (12) being arranged to cover the connection position of the two sections of the cable body, the two sections inside the first heat shrinkable sheath (12) respectively abutting against the two waterproof tapes (11); A buffer portion, the buffer portion being mounted outside the first heat shrinkable sheath (12) and used for protecting the connection position of the two sections of the cable body; A positioning portion, which is installed on both sections of the cable body and is used to support the buffer portion; A second heat shrinkable sheath (13) is provided to cover the outside of the buffer portion, and two ends of the inside of the second heat shrinkable sheath (13) abut against the outer sheath (4).

6. A cross-linked polyethylene insulated power cable for mines according to claim 5, characterized in that: The buffer portion includes: A buffer shell (14), the buffer shell (14) is sleeved on the outer sheath (4) in the cable body, the buffer shell (14) is located at the connection position of two sections of the cable body, and both ends of the buffer shell (14) are configured as tapered structures; An airbag (15) is fixedly mounted inside the buffer shell (14), and a one-way joint (16) is provided at the end of the buffer shell (14), and the one-way joint (16) is connected to the airbag (15).

7. A cross-linked polyethylene insulated power cable for mines according to claim 6, characterized in that: The positioning portion includes: Positioning rings (17), the outer sheaths (4) of the two sections of the cable body are both provided with positioning rings (17), and the two positioning rings (17) are respectively in contact with the tapered structures at both ends of the buffer shell (14); Wherein, the positioning ring (17) consists of two half rings.

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