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CN-122025304-A - Outdoor tension cooperative spiral insulation slot frame cable with voltage of 1kV and below and manufacturing method thereof

CN122025304ACN 122025304 ACN122025304 ACN 122025304ACN-122025304-A

Abstract

The invention relates to the technical field of cable production, in particular to a tension cooperative spiral insulation groove frame cable for outdoor use of 1kV and below and a manufacturing method thereof, comprising the following steps of S1, preparing a spiral insulation groove frame, namely extruding a high polymer insulation material on a bearing steel core through a hot extrusion process by using a spiral plastic extruder to form a spiral guide groove structure; S2, cooling and forming, namely performing water cooling forming on the spiral insulating groove frame prepared in the step S1, drying the surface water stain, S3, placing a conductor in a clamping groove of the spiral insulating groove frame formed in the step S2 to form a semi-finished product of the cable, and then compacting the outer part of the semi-finished product, and S4, preparing a protective layer, namely sequentially arranging a polymer insulating layer and a polymer outer sheath outside the compacted semi-finished product of the cable to form a protective structure. The invention solves the problems of poor cooperative protection and tension adaptability of an outdoor laid cable bearing steel core and a peripheral structure and insufficient adaptation to different outdoor scenes in the prior art.

Inventors

  • JIANG LUSI

Assignees

  • 云南多宝电缆集团股份有限公司

Dates

Publication Date
20260512
Application Date
20260311

Claims (10)

  1. The manufacturing method of the outdoor tension cooperative spiral insulation groove rack cable with the voltage of 1.1kV and below is characterized by comprising the following steps: S1, preparing a spiral insulation groove frame, namely extruding a high polymer insulation material on a bearing steel core by using a spiral plastic extruder through a hot extrusion process to form a spiral guide groove structure; S2, cooling and forming, namely performing water cooling and forming on the spiral insulating groove frame (23) prepared in the step S1, and drying the surface water stain; S3, arranging conductors, namely arranging conductors (25) in the spiral guide grooves (613) of the spiral insulating groove frames (23) formed in the step S2 to form a cable semi-finished product, and then compacting the outer part of the semi-finished product; and S4, preparing a protective layer, namely sequentially arranging a polymer insulating layer (22) and a polymer outer sheath (20) outside the compacted cable semi-finished product to form a protective structure.
  2. 2. The method for manufacturing the outdoor tension cooperative spiral insulation grooved frame cable with the voltage of 1kV and below according to claim 1, wherein, the high polymer insulating material for preparing the spiral insulating groove frame (23) in the step S1 comprises one of polyvinyl chloride (PVC), polyethylene (PE), cross-linked polyethylene (XLPE) and Ethylene Propylene Rubber (EPR); the number of the spiral guide grooves (613) on the spiral insulating groove frame (23) is the same as the number of the conductors to be placed, the spiral pitch T is determined according to the diameter D of the spiral insulating groove frame (23), and the spiral pitch of the same-section cable is the same.
  3. 3. The method for manufacturing the outdoor tension cooperative spiral insulation groove frame cable according to claim 2, wherein the edge part of the spiral insulation groove frame (23) is extruded to form a phase sequence identification structure, the phase sequence identification structure is composed of grooves with different numbers, 1 groove is formed in the edge of the spiral insulation groove frame (23) corresponding to the 1 st phase cable, 2 grooves are formed in the edge of the spiral insulation groove frame (23) corresponding to the 2 nd phase cable, 3 grooves are formed in the edge of the spiral insulation groove frame (23) corresponding to the 3 rd phase cable, and the grooves of each phase are arranged along Zhou Xiangcheng clockwise directions of the spiral insulation groove frame (23).
  4. 4. The method for manufacturing an outdoor tension cooperative spiral insulation groove frame cable of 1kV and below according to claim 3, wherein the conductor (25) in step S3 is spirally embedded in the spiral guide groove (613) of the spiral insulation groove frame (23), and mutual insulation is achieved through the spiral guide groove (613); In the step S4, a polymer insulating layer (22) structure with the same material is formed outside the spiral insulating groove frame (23) through coextrusion in a hot extrusion mode, so that the insulating performance can be improved, and the conductor (25) in the spiral insulating groove frame (23) can be hooped.
  5. 5. The method for manufacturing the outdoor tension cooperative spiral insulation groove frame cable with the tension of 1kV and below according to claim 4, wherein the polymer outer sheath (20) in the step S4 is arranged outside the polymer insulation layer (22) through a hot extrusion process, so that ultraviolet resistance and ageing resistance are improved.
  6. 6. The method for manufacturing the outdoor tension cooperative spiral insulation groove frame cable with the voltage of 1kV and below according to claim 1, wherein the spiral plastic extruder comprises a base (1), a first driving motor (2) and a spiral extrusion mechanism (6), the first driving motor (2) is arranged at the upper part of the base (1), and the first driving motor (2) is connected with the feeding mechanism (8) to guide the hot-melt insulating material into the spiral extrusion mechanism (6); The spiral extrusion mechanism (6) comprises an extruder body (601), a spiral extrusion head (607), a material guide plate (609), a worm wheel (608) and a worm (605), wherein the spiral extrusion head (607) is arranged in a guide hole of the connecting disc (603) through a bearing (606) at one end, and the material guide plate (609) is arranged in the spiral extrusion head (607); A worm wheel (608) is arranged outside the spiral extrusion head (607), and the worm wheel (608) is meshed with the upper worm (605).
  7. 7. The method for manufacturing the outdoor tension cooperative spiral insulation grooved frame cable of 1kV and below according to claim 6, wherein, one end of the spiral extrusion head (607) is provided with a butt joint clamping groove (611), and the butt joint clamping groove (611) is movably connected with a through hole of the connecting disc (603) through a bearing (606); a clamping ring is arranged in the butt joint clamping groove (611), and a reverse thread (612) is arranged on the clamping ring to push the overflowed insulating material reversely in a coextrusion way; The feeding end of the connecting disc (603) is inserted into a first discharging hole (602) of the extruder body (601); a guide (610) is arranged on the other end of the spiral extrusion head (607); the upper part of the material guiding plate (609) is provided with a plurality of spiral guide grooves (613), and the middle part of the material guiding plate (609) is provided with a steel core guiding-out hole (618); A plurality of marking bayonets (614) are arranged at the edge of the material guide plate (609), and the marking bayonets (614) are arranged in a clockwise increasing mode; the material guide plate (609) is fixedly arranged in the spiral extrusion head (607) and integrally rotates with the spiral extrusion head (607); The extruder body (601) upper portion is provided with fixed bolster (619), is provided with worm (605) in the inside first pivot of fixed ear of fixed bolster (619), and first pivot one end is connected with second sprocket (615) on the output shaft of second driving motor (604) through first sprocket (617) and first chain (616), forms transmission structure.
  8. 8. The method for manufacturing the outdoor tension cooperative spiral insulation frame cable of 1kV and below according to claim 7, wherein the feeding mechanism (8) comprises a feeding box (801), a first crushing roller (810), a second crushing roller (811), a transmission machine (802) and a material guiding pipe (812), the feeding box (801) is of a rectangular cavity structure with an opening at the upper part, a first crushing roller (810) and a second crushing roller (811) are arranged in the feeding box (801), and a first gear at one end of the first crushing roller (810) is meshed with a second gear at one end of the second crushing roller (811); The bottom of feeding case (801) is provided with the baffle box, and the discharge end of baffle box is connected with extruder body (601) through baffle tube (812), and the inside of baffle tube (812) is provided with spiral guide bar (813), and the other end of spiral guide bar (813) stretches into driving case (3) cavity inside and is connected with third gear (10), and third gear (10) are connected with fourth gear (9) meshing on the lower part first driving motor (2) output shaft, form transmission structure.
  9. 9. The method for manufacturing the outdoor tension cooperative spiral insulation slot frame cable of 1kV and below according to claim 8, wherein the driving box (3) is arranged at the upper part of the base (1), a third chain wheel (807) is further arranged on the output shaft of the first driving motor (2), and the third chain wheel (807) is connected with a fourth chain wheel (805) at one end of the rotating shaft of the driving machine (802) through a second chain (806); A fifth chain wheel (803) is arranged at the other end of the rotating shaft of the transmission machine (802), and the fifth chain wheel (803) is connected with a sixth chain wheel at the end part of the first crushing roller (810) through a third chain (804); The spiral plastic extruder further comprises a cooling mechanism (7), the cooling mechanism (7) comprises a cooling groove (701), a first supporting bracket (702), an adjusting rod (703) and a pressing device (704), the cooling groove (701) is of a cavity structure with an opening at the upper part, the cooling groove (701) is provided with a plurality of first supporting brackets (702), the adjusting holes of the first supporting brackets (702) are internally provided with the adjusting rod (703), and the pressing device (704) is arranged at the lower part of the adjusting rod (703); One end of the cooling groove (701) is provided with a second discharge hole (705), and a guide roller (706) is arranged on the second discharge hole (705).
  10. 10. The outdoor tension cooperative spiral insulation groove frame cable of 1kV and below manufactured by the manufacturing method according to any one of claims 1-9, which is characterized by comprising a spiral insulation groove frame (23), a conductor (25), a polymer insulation layer (22) and a polymer outer sheath (20), wherein the conductor (25) is arranged in a spiral guide groove of the spiral insulation groove frame (23) and is used for transmitting electric energy; a conductor core insulating layer (24) is arranged on the outer wall of the conductor (25); the outside of the spiral insulating groove frame (23) is integrally provided with a cable wrapping belt; the polymer insulating layer (22) is arranged outside the cabling tape, and a polymer outer sheath (20) is arranged outside the polymer insulating layer (22).

Description

Outdoor tension cooperative spiral insulation slot frame cable with voltage of 1kV and below and manufacturing method thereof Technical Field The invention relates to the technical field of cable production, in particular to a tension cooperative spiral insulating slot frame cable for outdoor use of 1kV or below and a manufacturing method thereof. Background In a power transmission and distribution system, a low-voltage cable with the voltage of 1kV or below is a core carrier for realizing close-range power supply, equipment connection and control signal transmission, is widely applied to various scenes such as industrial factories, residential communities, municipal works and outdoor infrastructures, can be divided into conventional types such as single cores, two cores, three cores, four cores and five cores according to the difference of the insulating cores, and simultaneously comprises control cables with the core number of more than 5 cores of 450/750V and below so as to adapt to different power supply capacities and control signal transmission requirements. For a low-voltage cable, especially a multi-core power cable, laid in outdoor air, the existing main stream structure comprises an insulating wire core, a cushion layer, a steel wire and an outer protective layer, wherein the insulating wire core is of an independent insulating design, namely an insulating layer is extruded outside each phase of conductor independently, then the insulating wire core is twisted to form a cable core through a cabling procedure, the cushion layer is extruded outside the cable core to ensure the structural stability and the basic protective performance of the cable core, the cable needs to bear the self weight and the axial tension between two supporting points in consideration of an outdoor suspended laying scene, the steel wire is generally wrapped outside the cushion layer to serve as a bearing structure, and finally the outer protective layer is extruded outside the steel wire to form a complete cable structure. The structure bears main tension load through the steel wire, and can meet the mechanical requirement of outdoor suspended laying to a certain extent, so that the structure is widely applied to outdoor cable laying engineering. In the prior art, related researches provide a spiral insulating groove support conductor with the voltage of 1kV or below, an integral extrusion insulating power cable, a control cable and a preparation method, the design principle of the spiral insulating groove support conductor is definitely applicable to multi-core power cables and control cables with the voltage of 1kV or below laid outdoors, other special-purpose cables can be executed in a referencing mode, and meanwhile, an optimization scheme capable of canceling a bearing steel wire in the middle of the cable is provided for indoor laying scenes (such as cable bracket or bridge laying), so that a diversified thought is provided for the structural design of the low-voltage cable. However, in the practical outdoor complex environment laying process, the existing cable structure and related technologies still have an optimization space, on one hand, the cable needs to bear natural factor erosion such as wind and rain, temperature difference and ultraviolet irradiation for a long time in the outdoor environment, the cooperative protection performance between the existing steel wire bearing structure and the cushion layer and the outer protective layer needs to be improved, the problems of steel wire corrosion, peeling with peripheral structures and the like easily occur after long-term use, and further the tension bearing stability and the service life of the cable are affected, on the other hand, the tension cooperative suitability of the existing spiral insulation groove support structure is insufficient, and in the process links of multi-core cable twisting arrangement and integral extrusion insulation, the precise stress matching between the support structure and the conductor and the insulation layer is difficult to realize, and the local stress concentration possibly occurs in the cable laying process, so that the insulation performance and the structural integrity are affected. In addition, aiming at the defect of insufficient suitability of different outdoor laying spans and different tension load demands, the generalized structure is difficult to consider the economical efficiency and reliability of various outdoor scenes, and a novel cable structure capable of realizing tension collaborative optimization and improving outdoor adaptability and service life and a corresponding manufacturing method are needed. Based on the limitation of the prior art and the practical requirement of outdoor cable laying, the development of the outdoor tension cooperative spiral insulation groove frame cable with the voltage of 1kV or below and the manufacturing method thereof have important practical significance and application value.