Halogen-free low-smoke environment-friendly control cable for coal mine

Abstract

The utility model belongs to the field of cables, and provides a halogen-free low-smoke environment-friendly control cable for a coal mine, which comprises a plurality of cable cores, a heat insulation layer arranged outside the cable core in the center, a heat insulation strip arranged between the adjacent cable cores and connected with the heat insulation layer, and a shielding layer, an isolation sleeve, an armor layer, a cooling pipe and an outer sheath arranged outside all the cable cores in sequence, each heat insulation strip comprises a plate-shaped radial section, a cylindrical section is arranged at the telecentric end of each plate-shaped radial section, a filling layer is arranged between every two adjacent heat insulation strips, a first mica tape wrapping layer and a second mica tape wrapping layer are arranged between the filling layers and the shielding layer, and a thermoplastic thin-coating flame-retardant layer is arranged between the first mica tape wrapping layer and the second mica tape wrapping layer. The outer sheath is of a colored structure and comprises a plurality of colored layers which are concentrically distributed, and the colors of the adjacent colored layers are different. The cable is reasonable in design, simple in structure, good in heat insulation effect, high in wear resistance, beneficial to cost control and polling difficulty reduction, and suitable for large-scale popularization.

Description

Technical Field

[0001] The utility model belongs to the field of cables, and in particular relates to a halogen-free, low-smoke, and environmentally friendly control cable for coal mines. Background Art

[0002] Cable is a single component that connects two devices to transmit electrical signals by bonding, twisting or braiding two or more wires together. Cables are widely used and each use requires a special product that can transmit electrical energy, electrical signals and realize electromagnetic energy conversion. Low-smoke halogen-free cable refers to an environmentally friendly cable made of rubber materials that does not contain halogen, lead, cadmium, chromium, mercury and other environmental substances, and does not emit toxic smoke when burned. In coal mines, rubber-sheathed cables used for coal mining machines and other mining equipment are all flame-retardant cables.

[0003] The existing patent CN218333193U discloses a halogen-free, low-smoke, flame-retardant control cable for coal mines, which relates to the field of cable technology and specifically includes a conductor, wherein the conductor is a copper rod structure, an insulating layer is extruded outside the conductor, and multiple insulating layers are twisted into a cable core, and a shielding layer with overlapping metal tapes is wrapped outside the cable core, and an isolation sleeve is extruded outside the shielding layer, and an armor layer with two layers of galvanized steel tapes is wrapped around the isolation sleeve, and an outer sheath is extruded outside the armor layer. The cable is wrapped with overlapping high-purity metal tapes, and the shielding is seamless and has excellent anti-electromagnetic interference performance; the armor layer is wrapped with double-layer galvanized steel tapes, and the material strength and hardness are high, and the mechanical pressure resistance effect is good when it is used for fixed laying in mines; the isolation sleeve and the outer sheath are made of high-oxygen index, high-strength halogen-free, low-smoke, flame-retardant polyolefin materials, which have good flame retardant performance, are halogen-free, low-smoke, safe and environmentally friendly. However, there are still some problems with the actual application of this cable. First, the outer sheath of mining cables is mostly single-color, and in most cases it is black. In particular, the surface of the cable that is in direct contact with the mine and mining environment will be covered with a layer of coal powder, which can easily conceal the damaged parts of the cable, thereby increasing the difficulty of inspection; second, the distal end of the thermal insulation strip inside the cable is easy to deform, especially when the cable is in a stretched or twisted state, it is easy to tear, affecting its thermal insulation effect; third, the hardness of the metal shielding layer is greater than that of the non-metallic wrapping cloth, and if the metal material is directly wrapped from the outside of the cable core, more gaps need to be covered, so the metal material will increase and the cost will increase. Utility Model Content

[0004] In view of the technical problems existing in the above-mentioned control cables, the utility model proposes a halogen-free, low-smoke, environmentally friendly control cable for coal mines which has a reasonable design, a simple structure, good thermal insulation effect, high wear resistance, is beneficial to controlling costs and reducing the difficulty of inspection.

[0005] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is that the halogen-free, low-smoke, environmentally friendly control cable for coal mines provided by the utility model comprises a plurality of cable cores, a thermal insulation layer is arranged on the outside of the cable core located in the center, and a thermal insulation strip connected to the thermal insulation layer is arranged between adjacent cable cores, and a shielding layer, an isolation sleeve, an armor layer, a cooling tube and an outer sheath are arranged on the outside of all cable cores in sequence, the thermal insulation strip comprises a plate-shaped radial section, a cylindrical section is arranged at the distal end of the plate-shaped radial section, a filling layer is arranged between adjacent thermal insulation strips, a first mica tape wrapping layer and a second mica tape wrapping layer are arranged between the filling layer and the shielding layer, a thermoplastic thin coating flame retardant layer is arranged between the first mica tape wrapping layer and the second mica tape wrapping layer, and the outer sheath is a colored structure and comprises multiple concentrically distributed colored layers, and the colors of adjacent colored layers are different.

[0006] Preferably, the flame retardant layer of the thermoplastic thin clothing comprises a thermoplastic clothing, the thermoplastic clothing is provided with star-shaped grooves, and the surface of the thermoplastic clothing is coated with a flame retardant powder layer.

[0007] Preferably, a rectangular radial opening is provided on the side of the cylindrical segment, and the radial opening faces the first mica tape cladding.

[0008] Preferably, the colors of the multiple colored layers are sky blue, white, green, yellow and red from the outside to the inside.

[0009] Preferably, the thickness of the multiple colored layers gradually becomes thinner from the outside to the inside.

[0010] Preferably, the interior of the cooling tube is provided with extrusion holes distributed in a circular array around the center thereof, and the cross-section of the extrusion holes is rectangular.

[0011] Compared with the prior art, the advantages and positive effects of the utility model are:

[0012] 1. The halogen-free, low-smoke, environmentally friendly control cable for coal mines provided by the utility model has a multi-layer colored structure for the outer sheath, which can be distinguished from coal powder. The degree of wear of the cable can be judged by distinguishing the wear and exposure of the outer sheath, which can reduce the difficulty of inspection. The cylindrical section is used at the distal end of the insulation strip inside the cable, which not only has a high tensile strength to ensure its insulation effect, but also reduces the friction between it and the wrapped part, which is beneficial to extend the actual service life of the cable. The first mica tape wrapping layer, the thermoplastic thin flame retardant layer and the second mica tape wrapping layer are used as non-metallic wrapping structures, which can not only control the cost, but also have better wrapping effect and flame retardant effect. The cable has a reasonable design, simple structure, good insulation effect, high wear resistance, is beneficial to control costs and reduce the difficulty of inspection, and is suitable for large-scale promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the following is a brief introduction to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0014] Figure 1 A cross-sectional view of a halogen-free, low-smoke, environmentally friendly control cable for coal mines provided in an embodiment;

[0015] Figure 2 A partial schematic diagram of the unfolding of the flame retardant layer of the thermoplastic thin clothing provided in the embodiment;

[0016] In the above figures, 1, cable core; 2, insulation layer; 3, insulation strip; 31, plate-shaped radial section; 32, cylindrical section; 33, radial opening; 4, filling layer; 5, first mica tape wrapping layer; 6, thermoplastic thin coat flame retardant layer; 61, thermoplastic coat; 62, star-shaped groove; 7, second mica tape wrapping layer; 8, shielding layer; 9, isolation sleeve; 10, armor layer; 11, cooling pipe; 11a, extrusion hole; 12, outer sheath; 12a, colored layer. DETAILED DESCRIPTION

[0017] In order to more clearly understand the above-mentioned purpose, features and advantages of the utility model, the utility model is further described below in conjunction with the accompanying drawings and embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict. For the convenience of description, if the words "upper", "lower", "left" and "right" appear below, they only indicate that the upper, lower, left and right directions are consistent with the drawings themselves, and do not limit the structure.

[0018] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways than those described herein. Therefore, the present invention is not limited to the specific embodiments of the following disclosure.

[0019] Examples, such as Figure 1 , Figure 2As shown, the halogen-free, low-smoke, environmentally friendly control cable for coal mines provided by the utility model comprises a plurality of cable cores 1, a heat insulation layer 2 is arranged outside the cable core 1 located in the center, a heat insulation strip 3 connected to the heat insulation layer 2 is arranged between adjacent cable cores 1, and a shielding layer 8, an isolation sleeve 9, an armor layer 10, a cooling tube 11 and an outer sheath 12 are sequentially arranged outside all the cable cores 1. Among them, the cable core 1, the heat insulation layer 2, the isolation sleeve 9, and the armor layer 10 are prior arts, and will not be described in detail in this embodiment. Since the cable uses a first mica tape wrapping layer 5, a thermoplastic thin flame retardant layer 6 and a second mica tape wrapping layer 7 as a non-metallic wrapping structure on the outside of the cable core 1, the thickness of the metal shielding layer 8 can be appropriately thinned. On this basis, the thermal insulation strip 3 provided by the utility model includes a plate-shaped radial section 31, a cylindrical section 32 is arranged at the distal end of the plate-shaped radial section 31, a filling layer 4 is arranged between adjacent thermal insulation strips 3, the filling layer 4 is mainly composed of a tensile rope with flame retardant and tensile resistance, a first mica tape wrapping layer 5 and a second mica tape wrapping layer 7 are arranged between the filling layer 4 and the shielding layer 8, a thermoplastic thin coating flame retardant layer 6 is arranged between the first mica tape wrapping layer 5 and the second mica tape wrapping layer 7, and the outer sheath 12 is a colored structure and includes multiple layers of concentrically distributed colored layers 12a, and the colors of adjacent colored layers 12a are different.

[0020] Specifically, in addition to having a certain degree of wear resistance, the outer sheath 12 of the present cable adopts a multi-layer colored structure that can be distinguished from coal powder in appearance. In this way, the degree of wear of the cable can be judged by distinguishing the exposed color of the outer sheath 12, which can reduce the difficulty of inspection. Further, the plate-shaped radial section 31 of the heat insulation strip 3 inside the present cable can directly space the adjacent cable cores 1, and the cylindrical section 32 is used at its distal end to form a certain support with the round rolling surface of the adjacent cable core 1, which not only effectively improves the distribution stability of the heat insulation strip 3, but also improves the tensile strength of the heat insulation strip 3, which is conducive to ensuring that it exerts its heat insulation effect when the cable is stretched or twisted, and at the same time can reduce its friction with the wrapped part, which is conducive to extending the actual service life of the present cable. Further, the present cable adopts the first mica tape wrapping layer 5, the thermoplastic thin flame retardant layer 6 and the second mica tape wrapping layer 7 as a non-metallic wrapping structure, which can not only control the cost of the entire cable, but also has better wrapping effect and flame retardant effect.

[0021] In order to improve the flame retardancy of the combined wrapping of the first mica tape wrapping layer 5, the thermoplastic thin coat flame retardant layer 6 and the second mica tape wrapping layer 7, the thermoplastic thin coat flame retardant layer provided by the utility model includes a thermoplastic coat 61, on which a star-shaped groove 62 is provided, and the surface of the thermoplastic coat 61 is coated with a flame retardant powder layer. The star-shaped groove can provide a certain wrinkle line for the thermoplastic coat after thermoplasticization. In this way, the first mica tape wrapping layer 5 is used as the basic wrapping structure, and the thermoplastic thin coat flame retardant layer 6 is used to wrap the first mica tape wrapping layer 5, and after wrapping, its actual wrapping area is compressed by thermoplasticization, and certain wrinkles are formed on its surface, which can increase the coating stability of the flame retardant powder layer, and then the second mica tape wrapping layer 7 is used for secondary wrapping to further ensure the stability of the flame retardant powder layer, thereby improving the flame retardant performance of the cable near its cable core 1.

[0022] In order to improve the practicality of the thermal insulation strip 3, the side of the cylindrical section 32 provided by the utility model is provided with a rectangular radial opening 33, and the radial opening 33 faces the first mica tape wrapping layer 5. The cylindrical section 32 not only provides a rounded surface to form support with the cable core 1, but also has the radial opening 33 to provide a structural basis for the compression function, thereby ensuring the stability of the thermal insulation strip 3 inside the filling layer 4.

[0023] In order to reduce the difficulty of cable inspection in coal mine environment, the utility model provides a plurality of colored layers 12a, the colors of which are sky blue, white, green, yellow and red from outside to inside. In this way, the exposed sky blue, white, green, yellow and red can be distinguished intuitively, and the degree of cable wear can be directly judged from general visual identification, especially from green to yellow, and then from yellow to red, indicating that the wear has gradually approached the heavy wear limit of the cable.

[0024] Furthermore, the thickness of the multi-layer colored layer 12a gradually becomes thinner from the outside to the inside. By designing the thickness of different colored parts, on the one hand, it can control the wear-resistant thickness, and on the other hand, it is helpful for inspection personnel to make a relatively quantitative judgment on the degree of wear and tear, which is conducive to timely maintenance measures.

[0025] In order to improve the practicality of the cable, the cooling tube 11 provided by the cable is provided with extrusion holes 11a distributed in a circular array around its center, and the cross section of the extrusion holes 11a is rectangular. The use of the cooling tube 11 with holes can increase its heat dissipation area on the one hand, and on the other hand, it is conducive to improving the overall toughness of the cable and improving its practicality in coal mine application scenarios.

[0026] The above description is only a preferred embodiment of the present invention and does not limit the present invention in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes and apply it to other fields. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A halogen-free, low-smoke, environmentally friendly control cable for coal mines, comprising a plurality of cable cores, a heat insulation layer is arranged outside the cable core located in the center, a heat insulation strip connected to the heat insulation layer is arranged between adjacent cable cores, and a shielding layer, an isolation sleeve, an armor layer, a cooling tube and an outer sheath are arranged outside all the cable cores in sequence, characterized in that: The thermal insulation strip comprises a plate-shaped radial segment, a cylindrical segment is arranged at the distal end of the plate-shaped radial segment, a filling layer is arranged between adjacent thermal insulation strips, a first mica tape wrapping layer and a second mica tape wrapping layer are arranged between the filling layer and the shielding layer, a thermoplastic thin coating flame retardant layer is arranged between the first mica tape wrapping layer and the second mica tape wrapping layer, and the outer sheath is a colored structure and comprises multiple concentrically distributed colored layers, and the colors of adjacent colored layers are different.

2. The halogen-free, low-smoke, environmentally friendly control cable for coal mines according to claim 1 is characterized in that: The flame retardant layer of the thermoplastic thin clothing comprises a thermoplastic clothing, star-shaped grooves are arranged on the thermoplastic clothing, and a flame retardant powder layer is coated on the surface of the thermoplastic clothing.

3. The halogen-free, low-smoke, environmentally friendly control cable for coal mines according to claim 2 is characterized in that: A rectangular radial opening is arranged on the side surface of the cylindrical segment, and the radial opening faces the first mica tape cladding.

4. The halogen-free, low-smoke, environmentally friendly control cable for coal mines according to claim 3 is characterized in that: The colors of the multi-layer colored layers are sky blue, white, green, yellow and red from the outside to the inside.

5. The halogen-free, low-smoke, environmentally friendly control cable for coal mines according to claim 4 is characterized in that: The thickness of the colored layers gradually decreases from the outside to the inside.

6. The halogen-free, low-smoke, environmentally friendly coal mine control cable according to any one of claims 1 to 5, characterized in that: The interior of the cooling tube is provided with extrusion holes distributed in a circular array around the center thereof, and the cross section of the extrusion holes is rectangular.

Images