Buried mechanical stress resistant cable

Abstract

This utility model relates to a buried mechanical stress resistant cable in the field of cables, comprising a conductor, an insulation layer sleeved outside the conductor, a shielding layer sleeved outside the insulation layer, a wrapping layer sleeved outside the shielding layer, a flame-retardant filler layer filled between the shielding layer and the wrapping layer, and a steel tape armor layer wrapped outside the wrapping layer; an inner sheath is sleeved outside the steel tape armor layer, and an outer sheath is sleeved outside the inner sheath; the outer layer of the inner sheath is integrally formed with a ring leaf, and multiple ring leaves are formed and evenly distributed along the axial direction of the inner sheath. The outer sides of the multiple ring leaves are sequentially sleeved, and inclined and extending deformation gaps are formed between the multiple ring leaves. By adopting the above structure, while ensuring that the cable has good mechanical stress resistance performance, the reliability of the overall cable structure is guaranteed, and the cable quality is guaranteed, thereby coping with the complex underground working environment and meeting the cable laying requirements of the coal mine environment.

Description

Technical Field

[0001] This utility model relates to a buried anti-mechanical stress cable, and more particularly to a buried anti-mechanical stress cable applied in the field of cables. Background Technology

[0002] In the coal mining industry, cables buried deep underground are not easy to replace frequently. The cables need to have a long service life. Moreover, the coal mining environment is closed, so the cables also need to have good environmental protection, flame retardant and fire-resistant properties. In the working environment, the cables also need to have good mechanical properties and be able to adapt to complex working environments. Therefore, a buried anti-mechanical stress cable is proposed to improve the above problems. Utility Model Content

[0003] In view of the above-mentioned prior art, the technical problem to be solved by this utility model is how to provide a buried mining cable with excellent oil resistance, corrosion resistance, aging resistance, environmental protection and flame retardancy, and outstanding physical and mechanical properties.

[0004] To solve the above problems, this utility model provides a buried anti-mechanical stress cable, including a conductor, an insulation layer sleeved on the outside of the conductor, a shielding layer sleeved on the outside of the insulation layer, a wrapping layer sleeved on the outside of the shielding layer, a flame-retardant filling layer filled between the shielding layer and the wrapping layer, and a steel tape armor layer wrapped on the outside of the wrapping layer.

[0005] An inner protective sleeve is fitted on the outside of the steel strip armor layer, and an outer protective sleeve is fitted on the outside of the inner protective sleeve.

[0006] The outer layer of the inner sheath is integrally formed with a ring blade. Multiple ring blades are formed and evenly distributed along the axial direction of the inner sheath. The outer sides of the multiple ring blades are sequentially sleeved, and an inclined and extending deformation gap is formed between the multiple ring blades.

[0007] In the aforementioned buried anti-mechanical stress cable, by setting a steel tape armor layer and an inner sheath, the overall structural strength of the cable is enhanced, and the cable has strong resistance to mechanical stress and puncture, thus coping with the complex underground working environment and meeting the cable laying requirements of the coal mine environment.

[0008] As a further improvement of this application, each annular leaf has a bend on its inner side where it fits with the inner sheath. The bend and the deformation gap have different inclination angles, and the inclination angle of the bend is smaller than that of the deformation gap.

[0009] As a further improvement of this application, anti-crack grooves are provided at the intersection of two adjacent ring blades. The anti-crack grooves are grooves with a cross-section of approximately circular shape and are connected to the conical bottom of the deformation gap.

[0010] As a further improvement of this application, the steel strip armor layer includes a galvanized steel strip and a low-smoke halogen-free strip. The galvanized steel strip is wrapped in two layers with a gap ratio of 45-48% in the left direction, and then two layers of low-smoke halogen-free strip are wrapped in the right direction with an overlap ratio of 25%.

[0011] As a further improvement of this application, a reinforcing rib is fixedly embedded on the inner side of the outer sheath. The reinforcing rib extends spirally, and the end of the reinforcing rib protruding from the inner side of the outer sheath is movably embedded into the end opening of the deformation gap.

[0012] As another improvement of this application, multiple reinforcing ribs are provided, all of which extend spirally in the same direction, are staggered and wrapped around each other, and form a cylindrical reinforcing body with the same gap as the gap of the multiple annular leaves.

[0013] In summary, by incorporating an inner sheath and reinforcing ribs, the overall structural strength of the cable is enhanced, while its resistance to mechanical stress and puncture is improved. Specifically, the design of the annular leaflets and the deformation gaps between multiple leaflets create a layered, deformable structure on the outer layer of the inner sheath. This allows the inner sheath to exhibit both resistance to mechanical stress and the ability to create clearance space in the event of puncture or breakdown, guiding multi-directional displacement and preventing complete puncture, thus providing excellent protection. The reinforcing rib structure reinforces the ends of the deformation gaps, ensuring both good resistance to mechanical stress and the reliability of the overall cable structure, guaranteeing cable quality and enabling the cable to cope with complex underground operating environments, meeting the cable laying requirements of coal mine environments. Attached Figure Description

[0014] Figure 1 This is a cross-sectional structural diagram of the first embodiment of this application;

[0015] Figure 2 This is a partial side sectional view of the first embodiment of this application;

[0016] Figure 3 for Figure 2 Enlarged view of the structure at point A in the middle;

[0017] Figure 4 This is a schematic diagram of the reinforcing rib structure according to the second embodiment of this application.

[0018] Explanation of the labels in the diagram:

[0019] 1 Conductor, 2 Insulation layer, 3 Shielding layer, 4 Wrapping layer, 5 Flame-retardant filling layer, 6 Steel strip armor layer, 7 Inner sheath, 71 Ring leaf, 711 Folded corner, 712 Deformation gap, 72 Crack-resistant ring groove, 8 Outer sheath, 9 Reinforcing rib. Detailed Implementation

[0020] The two embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0021] Implementation method 1:

[0022] Figure 1-3 The diagram shows a buried anti-mechanical stress cable, comprising a conductor 1, an insulation layer 2 sleeved on the outside of the conductor 1, a shielding layer 3 sleeved on the outside of the insulation layer 2, a wrapping layer 4 gapped on the outside of the shielding layer 3, a flame-retardant filling layer 5 filled between the shielding layer 3 and the wrapping layer 4, and a steel tape armor layer 6 wrapped on the outside of the wrapping layer 4.

[0023] Among them, the insulation layer 2 is cross-linked with ultraviolet light; the average thickness range of the extrusion is 1.7+0.05 / 1.2+0.05mm, and the thinnest point is 1.43 / 0.98mm; the shielding layer 3 is made of shielding copper tape of 0.10×45, and the overlap rate is 8~12%.

[0024] The flame-retardant filling layer 5 includes flame-retardant filling rope; the specifications and number of filling ropes are designed according to the outer diameter of the cable core, but the non-roundness after cabling must be ≤10% and the filling coefficient must reach more than 80%. The wrapping layer 4 includes flame-retardant wrapping tape wrapped around the outside of the flame-retardant filling layer 5. The wrapping after cabling must be tight and without any gaps.

[0025] The steel strip armor layer 6 includes galvanized steel strip and low smoke halogen-free strip. Two layers of galvanized steel strip are wrapped with a gap ratio of 45-48% and wrapped in the left direction. Then, two layers of low smoke halogen-free strip are wrapped with an overlap ratio of 25% and wrapped in the opposite direction.

[0026] The steel strip armor layer 6 is covered with an inner sheath 7. The inner sheath 7 is made of coal mine low-smoke halogen-free flame-retardant oxygen barrier material with a thickness of 1.5mm and a minimum thickness of ≥1.00mm. The inner sheath 7 is covered with an outer sheath 8. The outer sheath 8 is made of coal mine thermoplastic low-smoke halogen-free flame-retardant sheath material with a standard thickness of 22.9mm, a minimum thickness of ≥2.12mm, and an average thickness control range of 2.3~2.8mm.

[0027] The low-smoke, halogen-free flame-retardant oxygen barrier material used in coal mines can achieve good crack resistance while maintaining high flame retardant performance, and also has long-term stability. The thermoplastic low-smoke, halogen-free flame-retardant sheath material used in coal mines not only has the halogen-free and low-smoke characteristics of polyolefin materials, but also has high-strength mechanical properties to meet the requirements of cable laying and installation in various complex environments.

[0028] The outer layer of the inner sheath 7 is integrally formed with annular blades 71. Multiple annular blades 71 are formed and evenly distributed along the axial direction of the inner sheath 7. The outer sides of the multiple annular blades 71 are sequentially sleeved, and an inclined and extending deformation gap 712 is formed between the multiple annular blades 71.

[0029] Based on the above structure, by setting the steel strip armor layer 6 and the inner sheath 7, the overall structural strength of the cable is enhanced on the one hand, and the cable has strong resistance to mechanical stress and puncture on the other hand. Specifically, the design of the ring leaf 71 and the design of the deformation gap 712 between multiple ring leaves 71 make the outer layer of the inner sheath 7 form a layered deformable structure. This allows the inner sheath 7 to not only have the deformable characteristics to resist mechanical stress, but also to form a clearance space in the event of puncture or breakdown, and to guide multi-directional offset, making it difficult to be completely punctured, thus playing a good protective role. This allows it to cope with the complex underground working environment and meet the cable laying requirements of the coal mine environment.

[0030] Furthermore, each annular leaf 71 has a bend 711 formed on the inner side where it fits against the inner sheath 7. The bend 711 and the deformation gap 712 have different inclination angles, and the inclination angle of the bend 711 is smaller than that of the deformation gap 712. This allows two adjacent annular leaves 71 to deform at a large angle under mechanical stress and to be relatively misaligned under puncture force, thus producing good resistance to mechanical stress and puncture.

[0031] Crack-resistant grooves 72 are provided at the intersection of two adjacent ring blades 71. The crack-resistant grooves 72 are grooves with a cross-section of approximately circular. The crack-resistant grooves 72 are connected to the conical bottom of the deformation gap 712, thereby preventing cracks from forming between the ring blades 71 when resisting mechanical stress, ensuring the reliability of the inner sheath 7's own structure, and extending the service life of the inner sheath 7.

[0032] Furthermore, a reinforcing rib 9 is fixedly embedded on the inner side of the outer sheath 8. The reinforcing rib 9 extends spirally, and the end of the reinforcing rib 9 protruding from the inner side of the outer sheath 8 is movably embedded into the end opening of the deformation gap 712. The structure of the reinforcing rib 9 can strengthen the structure at the port of the deformation gap 712, ensuring that the cable has good resistance to mechanical stress, while ensuring the reliability of the overall cable structure and ensuring the quality of the cable.

[0033] The second implementation method:

[0034] Figure 4 As shown, multiple reinforcing ribs 9 are provided, all of which extend spirally in the same direction, are staggered and wrapped around each other, and form a cylindrical reinforcing body with the same gap as the gap of multiple annular leaves 71.

[0035] By setting multiple reinforcing ribs 9 and forming them into a cylindrical reinforcing body, the gaps in the annular leaf 71 can be better reinforced structurally, and multiple reinforcement effects can be formed, further improving the quality of the cable and extending the service life of the buried anti-mechanical stress cable.

[0036] In light of current practical needs, the above-described embodiments adopted in this application are not limited to these. Any changes made within the scope of knowledge possessed by those skilled in the art without departing from the concept of this application still fall within the protection scope of this utility model.

Claims

1. A buried anti-mechanical stress cable, comprising a conductor (1), an insulation layer (2) sleeved on the outside of the conductor (1), a shielding layer (3) sleeved on the outside of the insulation layer (2), a wrapping layer (4) gapped on the outside of the shielding layer (3), a flame-retardant filler layer (5) filled between the shielding layer (3) and the wrapping layer (4), and a steel tape armor layer (6) wrapped on the outside of the wrapping layer (4), characterized in that: The steel strip armor layer (6) is covered with an inner sheath (7) on the outside, and the inner sheath (7) is covered with an outer sheath (8) on the outside; The outer layer of the inner sheath (7) is integrally formed with a ring leaf (71). Multiple ring leaves (71) are formed and evenly distributed along the axial direction of the inner sheath (7). The outer sides of the multiple ring leaves (71) are sequentially sleeved, and an inclined and extending deformation gap (712) is formed between the multiple ring leaves (71).

2. A mechanically resistant buried cable according to claim 1, characterized in that: Each of the annular leaf (71) has a bend (711) formed on the inner side where it fits against the inner sheath (7). The bend (711) has a different inclination angle than the deformation gap (712), and the inclination angle of the bend (711) is smaller than that of the deformation gap (712).

3. A mechanically resistant buried cable according to claim 2, characterized in that: Anti-crack grooves (72) are provided at the intersection of two adjacent ring blades (71). The anti-crack grooves (72) are grooves with a cross-section of approximately circular shape. The anti-crack grooves (72) are connected to the conical bottom of the deformation gap (712).

4. A mechanical strength resistant cable according to claim 1, characterized in that: The steel strip armor layer (6) includes galvanized steel strip and low smoke halogen-free strip. The galvanized steel strip is wrapped in two layers with a gap ratio of 45-48% and wrapped in the left direction. Then, two layers of low smoke halogen-free strip are wrapped in the back with an overlap ratio of 25% and wrapped in the opposite direction.

5. A mechanically resistant buried cable according to any of claims 1-4, characterized in that: The outer sheath (8) is fixedly embedded with a reinforcing rib (9), which extends spirally. The end of the reinforcing rib (9) protruding from the inner side of the outer sheath (8) is movably embedded into the end opening of the deformation gap (712).

6. A mechanically resistant buried cable according to claim 5, characterized in that: The reinforcing ribs (9) are provided in multiple ways, and all of the reinforcing ribs (9) extend spirally in the same direction. The reinforcing ribs (9) are interlaced and wrapped around each other, and the multiple reinforcing ribs (9) form a cylindrical reinforcing body with the same gap as the multiple annular leaf (71).

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