Water-tree-resistant medium-voltage insulated cable and production equipment thereof

Abstract

The invention discloses a water-tree-resistant medium-voltage insulated cable, which comprises a plurality of central conductors, an insulated conductor bobbin is stranded among the plurality of central conductors through a stranding device, and the outside of the stranded central conductors is wrapped with an outer protective sleeve. The central conductor in the outer protective sleeve is filled with longitudinal water-blocking filling strips in a stranding manner through stranding equipment; the outer side of the insulated conductor wire shaft is provided with a conductor wire groove, the conductor wire groove is arranged in a spiral arc-shaped groove structure, the central conductor is arranged in the conductor wire groove, and the insulated conductor wire shaft between two adjacent central conductors is provided with a compression-resistant bulge. According to the invention, by arranging a series of structures, the insulation, anti-interference, tensile and protective performances of the cable are enhanced; the insulated conductor bobbin enhances the compression-resistant buffering and compression-resistant supporting performance of the cable, the cable is continuous in twisting rotation, large in bearing capacity and self-locking, cable twisting material conveying abrasion is reduced, and cable twisting conveying tensioning adjustment is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of cables, in particular to a water-tree resistant medium-voltage insulated cable and production equipment thereof. Background Art

[0002] Cable is a device for transmitting electric energy or signals, usually composed of several or several groups of wires. Water-tree resistant insulation material is a high-performance material used in the fields of electricity, communication, etc. It is a composite material composed of polymer materials and special additives. Water-tree resistant insulation material has good electrical insulation performance, mechanical stability, chemical durability and heat resistance. At the same time, water-tree resistant insulation material also has high water-tree resistance, which can effectively prevent water corona and dendrite breakdown generated in humid environments, thereby extending the service life of electrical equipment.

[0003] Although the current cables with multiple conductors twisted together are wrapped in insulating protective sheaths to provide insulation protection, the cables have poor compression and tensile properties. In addition, during the production process of cable twisting, the cable raw materials are worn out during transportation and the tension deviation during transportation affects the quality of the cables. The cable twisting rotation drive transmission and load-bearing capacity are poor, which affects the production quality and life of the cables. Summary of the invention

[0004] The object of the present invention is to provide a water-tree resistant medium-voltage insulated cable and a production device thereof, so as to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above object, the present invention provides the following technical solution: a water-tree resistant medium-voltage insulated cable, comprising a central conductor, wherein a plurality of the central conductors are provided, an insulating conductor bobbin is provided in the middle of the plurality of central conductors by twisting them through a twisting device, an outer protective sheath is provided on the outer surface of the twisted central conductor, and a longitudinal water-blocking filling strip is provided on the central conductor inside the outer protective sheath by twisting them through a twisting device;

[0006] A conductor wire groove is provided on the outside of the insulated conductor bobbin, and the conductor wire groove is provided in a spiral arc-shaped groove structure. The center conductor is arranged inside the conductor wire groove. A pressure-resistant protrusion is provided on the insulated conductor bobbin between two adjacent center conductors. The number of the conductor wire grooves and the pressure-resistant protrusions is the same as the number of the center conductors. A pressure-resistant channel is provided in the middle of the insulated conductor bobbin, and a pressure-resistant shaft is provided in the middle of the pressure-resistant channel. A pressure-resistant bracket is provided in the pressure-resistant channel between the insulated conductor bobbin and the pressure-resistant shaft.

[0007] The outer protective cover comprises an inner lining layer, an outer insulating layer, an armor layer and an outer sheath; the outer surface of the twisted central conductor and the longitudinal water-blocking filling strip is wrapped with the inner lining layer; the outer surface of the inner lining layer is wrapped with the outer insulating layer; the outer surface of the outer insulating layer is wrapped with the armor layer; and the outer surface of the armor layer is wrapped with the outer sheath.

[0008] Preferably, the central conductor includes a bare copper wire, an inner insulating layer, a shielding layer and an isolation layer. A plurality of bare copper wires are provided. The outer side of the bare copper wire is wrapped with an inner insulating layer, the outer side of the inner insulating layer is wrapped with a shielding layer, and the outer side of the shielding layer is wrapped with an isolation layer.

[0009] Preferably, the pressure-resistant channel and the pressure-resistant axis are both arranged in a regular polygonal structure, and the number of sides of the regular polygonal structure of the pressure-resistant channel and the pressure-resistant axis, the number of pressure-resistant brackets and the number of central conductors are the same.

[0010] A water-tree-resistant medium-voltage insulated cable production device comprises a stranding device, wherein the stranding device comprises a driving mechanism, a conductor mechanism, a tensioning plate, a stranding mechanism, a No. 1 carrier, a No. 2 carrier, a No. 1 unloading rack, a No. 2 unloading rack, a connecting rack and an unloading wheel, wherein the No. 1 carrier is provided on one side of the driving mechanism via a connecting rack, the No. 2 carrier is provided on the side of the No. 1 carrier away from the driving mechanism via a connecting rack, the conductor mechanism is provided on the side of the No. 2 carrier away from the No. 1 carrier via a connecting rack, the conductor mechanism is provided on the side of the No. 2 carrier away from the No. 1 carrier via a connecting rack, the tensioning plate is provided on the side of the conductor mechanism away from the No. 2 carrier via a supporting mechanism, and the tensioning plate is provided away from the conductor mechanism. A twisting mechanism is provided on one side through a bracket, a No. 2 unloading rack is provided on the side of the No. 2 carrier away from the No. 1 carrier, a No. 1 unloading rack is provided on the side of the No. 1 carrier away from the driving mechanism, a longitudinal water-blocking filling strip is provided on the No. 1 unloading rack, a wire roller is provided on the side of the driving mechanism away from the No. 1 carrier through a bracket, a unloading wheel is provided on the side of the wire roller away from the driving mechanism, an insulated conductor bobbin is provided on the unloading wheel, the insulated conductor bobbin passes through the driving mechanism, the connecting frame, the wire mechanism and the tensioning plate through the wire roller, and is introduced into the twisting mechanism to be twisted with the longitudinal water-blocking filling strip and the central conductor.

[0011] Preferably, the driving mechanism includes a No. 1 support frame, a carrying plate, a driving groove, a limiting slide rail, a worm gear and a worm. An axial hole is provided on the No. 1 support frame, a driving groove is provided in the middle of the No. 1 support frame, a carrying plate is provided at the end of the connecting frame away from the No. 1 carrying plate, and the carrying plate passes through the No. 1 support frame through the axial hole, limiting slide grooves are provided inside the No. 1 support frame on opposite sides of the driving groove, limiting slide rails are provided outside the carrying plate on opposite sides of the driving groove, two limiting slide rails are provided, and the limiting slide rails are slidably arranged in the limiting slide grooves, a worm gear is provided on the outer circumference of the carrying plate between the two limiting slide rails, and a worm gear is provided on the No. 1 support frame below the worm gear, and the worm gear is meshed with the worm gear, and one end of the worm gear is connected to the output end of the servo motor through a coupling.

[0012] Preferably, the wire mechanism includes a mounting plate, a guide plate, assembly bolts, a wire hole and a ball bearing. A mounting plate is provided at one end of the connecting frame away from the No. 2 carrier plate, a mounting groove is provided on the side of the mounting plate away from the connecting frame, a mounting hole is provided on the mounting plate, a guide plate is provided inside the mounting groove, the guide plate is fixed to the mounting plate by assembly bolts, a wire hole is provided on the guide plate, the wire hole is arranged by the mounting hole passing through the mounting plate, and a ball bearing is provided inside the wire hole.

[0013] Preferably, the support mechanism includes a No. 2 support frame and an adjustment mechanism, the No. 2 support frame is provided at the bottom of the tensioning plate, and the No. 2 support frame is provided at the bottom of the adjustment mechanism.

[0014] Preferably, the tensioning plate is provided with a plurality of tensioning holes which are evenly distributed and arranged at equal intervals, and balls are provided inside the tensioning holes.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. The water-tree-resistant medium-voltage insulated cable and its production equipment are composed of a center conductor and a longitudinal water-blocking filling strip twisted together. The inner insulating layer, shielding layer and isolation layer arranged on the center conductor are combined with the inner lining layer, outer insulating layer, armor layer and outer sheath wrapped by the twisted center conductor to enhance the insulation, anti-interference, tensile and protection performance of the cable; an insulating conductor bobbin is arranged at the center of the twisted center conductor, and the spiral conductor wire groove on the insulating conductor bobbin is matched with the center conductor twist to form a pressure-resistant protrusion, which cooperates with the pressure-resistant channel, pressure-resistant shaft and pressure-resistant bracket arranged on the insulating conductor bobbin to enhance the pressure-resistant buffering and pressure-resistant supporting performance of the cable.

[0017] 2. The water-tree resistant medium-voltage insulated cable and its production equipment realize the twisting operation of the center conductor, the longitudinal water-blocking filling strip and the insulating conductor bobbin through the cooperation of the set driving mechanism, the conductor mechanism, the tensioning plate, the twisting mechanism, the No. 1 carrier, the No. 2 carrier, the No. 1 unwinding rack, the No. 2 unwinding rack and the unwinding wheel. The twisting drive adopts the carrier on the No. 1 support frame, and drives the twisting rotation under the cooperation of the worm wheel and the worm, so that the cable twisting rotation is continuous, the load-bearing capacity is large, the transmission ratio is large and the structure is compact, the transmission is accurate, stable and noiseless, and it has self-locking properties.

[0018] 3. The water-tree resistant medium-voltage insulated cable and its production equipment reduce the conveying wear of the cable stranding materials by means of rollers arranged inside the conductor hole and the tensioning hole. The tensioning plate cooperates with the No. 2 support frame and the adjustment mechanism to realize the conveying tensioning adjustment of the cable stranding materials, so that the cable stranding is compact. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2It is a schematic structural diagram of the central conductor in the present invention;

[0021] Figure 3 It is a schematic structural diagram of the insulated conductor bobbin in the present invention;

[0022] Figure 4 It is a structural schematic diagram of the connecting frame in the present invention;

[0023] Figure 5 It is a structural schematic diagram of a No. 1 support frame in the present invention;

[0024] Figure 6 It is a schematic structural diagram of the guide plate in the present invention.

[0025] In the figure: 1. Longitudinal water-blocking filling strip; 2. Center conductor; 21. Bare copper wire; 22. Inner insulation layer; 23. Shielding layer; 24. Isolation layer; 3. Outer protective sheath; 31. Inner lining layer; 32. Outer insulation layer; 33. Armor layer; 34. Outer sheath; 4. Insulated conductor bobbin; 41. Conductor wire slot; 42. Pressure-resistant protrusion; 43. Pressure-resistant channel; 44. Pressure-resistant shaft; 45. Pressure-resistant bracket; 5. Driving mechanism; 51. No. 1 support frame; 52 , carrying plate; 53, driving groove; 54, limiting slide rail; 55, worm wheel; 56, worm; 6, wire mechanism; 61, mounting plate; 62, guide plate; 63, assembly bolt; 64, wire hole; 65, ball bearing; 7, tensioning plate; 71, No. 2 support frame; 72, adjustment mechanism; 8, twisting mechanism; 9, No. 1 carrying plate; 10, No. 2 carrying plate; 11, No. 1 unloading rack; 12, No. 2 unloading rack; 13, connecting frame; 14, unloading wheel. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments 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 creative work are within the scope of protection of the present invention.

[0027] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0028] like Figures 1 to 6As shown, the water-tree-resistant medium-voltage insulated cable of this embodiment includes a central conductor 2, wherein a plurality of central conductors 2 are provided, and an insulating conductor bobbin 4 is provided in the middle of the plurality of central conductors 2 by twisting with a twisting device, and an outer protective sheath 3 is provided on the outer surface of the twisted central conductor 2, and a longitudinal water-blocking filling strip 1 is provided on the central conductor 2 inside the outer protective sheath 3 by twisting with a twisting device;

[0029] A conductor groove 41 is provided on the outside of the insulating conductor bobbin 4, and the conductor groove 41 is provided in a spiral arc-shaped groove structure. The center conductor 2 is arranged inside the conductor groove 41, and a pressure-resistant protrusion 42 is provided on the insulating conductor bobbin 4 between two adjacent center conductors 2. The number of the conductor grooves 41 and the pressure-resistant protrusions 42 is the same as the number of the center conductors 2. A pressure-resistant channel 43 is provided in the middle of the insulating conductor bobbin 4, and a pressure-resistant shaft 44 is provided in the middle of the pressure-resistant channel 43. A pressure-resistant support 45 is provided in the pressure-resistant channel 43 between the insulating conductor bobbin 4 and the pressure-resistant shaft 44. The center conductor 2 is twisted in the conductor groove 41 of the insulating conductor bobbin 4, so that the center conductor 2 and the longitudinal water-blocking filling strip 1 are twisted in a spiral shape. The pressure-resistant protrusion 42 cooperates with the pressure-resistant channel 43, the pressure-resistant shaft 44 and the pressure-resistant support 45 provided on the insulating conductor bobbin 4 to enhance the pressure-resistant buffering and pressure-resistant supporting performance of the cable;

[0030] The outer protective sheath 3 includes an inner lining layer 31, an outer insulating layer 32, an armor layer 33 and an outer sheath 34. The outer surface of the twisted center conductor 2 and the longitudinal water-blocking filling strip 1 is wrapped with the inner lining layer 31, the outer surface of the inner lining layer 31 is wrapped with the outer insulating layer 32, the outer surface of the outer insulating layer 32 is wrapped with the armor layer 33, and the outer surface of the armor layer 33 is wrapped with the outer sheath 34. The inner lining layer 31 is made of waterproof material, the outer insulating layer 32 is made of water-tree resistant insulating material, the armor layer 33 is made of tensile metal braided layer, and the outer sheath 34 is made of wear-resistant material, so that the cable has good waterproof, insulating, tensile and wear-resistant properties.

[0031] Specifically, the center conductor 2 includes a bare copper wire 21, an inner insulating layer 22, a shielding layer 23 and an isolation layer 24. There are a plurality of bare copper wires 21. The outer side of the bare copper wire 21 is wrapped with an inner insulating layer 22, the outer side of the inner insulating layer 22 is wrapped with a shielding layer 23, and the outer side of the shielding layer 23 is wrapped with an isolation layer 24. The inner insulating layer 22 is made of water-tree resistant insulating material, the shielding layer 23 is composed of a shielding insulating layer and a metal shielding layer, and the isolation layer 24 is made of thermal insulation material, so that each center conductor 2 of the cable has good insulation, shielding and isolation properties.

[0032] Furthermore, the pressure-resistant channel 43 and the pressure-resistant axis 44 are both arranged in a regular polygonal structure. The number of sides of the regular polygonal structure of the pressure-resistant channel 43 and the pressure-resistant axis 44 and the number of pressure-resistant brackets 45 are the same as the number of central conductors 2, so the support has better pressure resistance.

[0033] A water-tree-resistant medium-voltage insulated cable production equipment comprises a stranding device, which comprises a driving mechanism 5, a conductor mechanism 6, a tensioning plate 7, a stranding mechanism 8, a No. 1 carrier plate 9, a No. 2 carrier plate 10, a No. 1 unloading rack 11, a No. 2 unloading rack 12, a connecting rack 13 and a unloading wheel 14. The driving mechanism 5, the conductor mechanism 6, the tensioning plate 7, the No. 1 carrier plate 9, the No. 2 carrier plate 10 and the connecting rack 13 are all provided with a coaxial center hole in the middle. The No. 1 carrier plate 9 is provided on one side of the driving mechanism 5 through the connecting rack 13, the No. 2 carrier plate 10 is provided on the side of the No. 1 carrier plate 9 away from the driving mechanism 5 through the connecting rack 13, the conductor mechanism 6 is provided on the side of the No. 2 carrier plate 10 away from the No. 1 carrier plate 9 through the connecting rack 13, the conductor mechanism 6 is provided on the side of the No. 2 carrier plate 10 away from the No. 1 carrier plate 9 through the connecting rack 13, the conductor mechanism 6 is provided on the side of the No. 2 carrier plate 10 away from the No. 1 carrier plate 9 through the supporting mechanism, the tensioning plate 7 is provided on the side of the tensioning plate 7 away from the conductor mechanism 6 through the bracket, the No. 2 carrier plate 10 is provided with a stranding mechanism 8 on the side of the No. 2 carrier plate 10 away from the No. 1 carrier plate 9 A No. 2 unloading rack 12 is provided on one side of the No. 1 carrier plate 9, a No. 1 unloading rack 11 is provided on the side of the No. 1 carrier plate 9 away from the driving mechanism 5, a longitudinal water-blocking filling strip 1 is provided on the No. 1 unloading rack 11, a wire roller is provided on the side of the driving mechanism 5 away from the No. 1 carrier plate 9 through a bracket, a unloading wheel 14 is provided on the side of the wire roller away from the driving mechanism 5 through a bracket, an insulating conductor bobbin 4 is provided on the unloading wheel 14, the insulating conductor bobbin 4 passes through the driving mechanism 5, the connecting frame 13, the wire mechanism 6 and the tensioning plate 7 through the wire roller, and is introduced into the twisting mechanism 8 to be twisted with the longitudinal water-blocking filling strip 1 and the central conductor 2, so as to realize the twisting operation of the central conductor 2, the longitudinal water-blocking filling strip 1 and the insulating conductor bobbin 4, the cable twisting rotation is continuous, the load-bearing capacity is large, the transmission ratio is large and the structure is compact, the transmission is accurate, stable and noiseless, and it has self-locking property, so as to reduce the transportation wear of the cable twisting material, and the cable twisting material transportation tension adjustment makes the cable twisting compact.

[0034] Specifically, the driving mechanism 5 includes a No. 1 support frame 51, a carrier plate 52, a driving groove 53, a limiting slide rail 54, a worm gear 55 and a worm 56. An axial hole is provided on the No. 1 support frame 51, and a driving groove 53 is provided in the middle of the No. 1 support frame 51. The end of the connecting frame 13 away from the No. 1 carrier plate 9 is provided with a carrier plate 52, and the carrier plate 52 passes through the No. 1 support frame 51 through the axial hole. The interior of the No. 1 support frame 51 on both sides of the driving groove 53 is provided with limiting slide grooves, and the outer sides of the carrier plate 52 on both sides of the driving groove 53 are provided with limiting slide rails 54. There are two limiting slide rails 54, and the limiting slide rails 54 are slidably arranged in the limiting slide grooves. A worm gear 55 is provided on the outer circumference of the carrier plate 52, and a worm 56 is provided on the No. 1 support frame 51 below the worm gear 55. The worm 56 is meshed with the worm wheel 55. One end of the worm 56 is connected to the output end of the servo motor through a coupling. The servo motor is arranged on the No. 1 support frame 51. The servo motor drives the worm 56 on the No. 1 support frame 51 to rotate. The rotation of the worm 56 drives the worm wheel 55 meshed with it to rotate. The rotation of the worm wheel 55 drives the carrier plate 52 to rotate on the No. 1 support frame 51, and the limiting slide rail 54 slides in the limiting slide groove. The rotation of the carrier plate 52 drives the No. 1 carrier plate 9, the No. 2 carrier plate 10 and the wire mechanism 6 to rotate through the connecting frame 13.

[0035] Furthermore, the wire mechanism 6 includes a mounting plate 61, a guide plate 62, an assembly bolt 63, a wire hole 64 and a ball 65. A mounting plate 61 is provided at one end of the connecting frame 13 away from the No. 2 carrier plate 10, and a mounting groove is provided on the side of the mounting plate 61 away from the connecting frame 13. A mounting hole is provided on the mounting plate 61, and a guide plate 62 is provided inside the mounting groove. A center hole is provided in the middle of the guide plate 62. The guide plate 62 is fixed to the mounting plate 61 by an assembly bolt 63, and the guide plate 62 and the mounting plate 61 can be disassembled and replaced. A wire hole 64 is provided on the guide plate 62, and the wire hole 64 is set by the mounting hole passing through the mounting plate 61. A ball 65 is provided inside the wire hole 64, and the ball 65 rolls in the wire hole 64. When the longitudinal water-blocking filling strip 1 and the center conductor 2 pass through the wire hole 64, the rolling ball 65 can reduce the wear of the longitudinal water-blocking filling strip 1 and the center conductor 2.

[0036] Furthermore, the supporting mechanism includes a No. 2 supporting frame 71 and an adjusting mechanism 72. The No. 2 supporting frame 71 is provided at the bottom of the tensioning plate 7. The No. 2 supporting frame 71 is provided at the bottom of the tensioning plate 7. The adjusting mechanism 72 is composed of an adjusting guide rail, a threaded rod, a threaded sleeve and a motor. The No. 2 supporting frame 71 and the tensioning plate 7 are driven to move by the adjusting mechanism 72, that is, the tensioning plate 7 is moved and adjusted between the conductor mechanism 6 and the twisting mechanism 8, so that the longitudinal water-blocking filling strip 1 and the center conductor 2 passing through the tensioning plate 7 are tensioned and adjusted.

[0037] Furthermore, the tensioning plate 7 is provided with a plurality of tensioning holes evenly distributed at equal intervals, and balls 65 are arranged inside the tensioning holes, so that the tensioning holes can roll and tension the longitudinal water-blocking filling strip 1 and the central conductor 2 passing therethrough, and the tensioning wear is small.

[0038] The method of using the present embodiment is as follows: a plurality of bare copper wires 21 are wrapped by an inner insulating layer 22, a shielding layer 23 and an isolation layer 24 to form a central conductor 2; a servo motor drives a worm 56 on a No. 1 support frame 51 to rotate; the rotation of the worm 56 drives a worm gear 55 meshing therewith to rotate; the rotation of the worm gear 55 drives a carrier plate 52 to rotate on the No. 1 support frame 51; a limiting slide rail 54 slides in a limiting slide groove; the rotation of the carrier plate 52 drives the No. 1 carrier plate 9, the No. 2 carrier plate 10 and the wire mechanism 6 to rotate through the connecting frame 13; and the insulating layer 56 on the discharge wheel 14 rotates. The conductor bobbin 4 passes through the center hole of the carrier plate 52, the connecting frame 13, the wire mechanism 6 and the tensioning plate 7 and is then introduced into the twisting mechanism 8. The longitudinal water-blocking filling strip 1 on the No. 1 unwinding frame 11 and the center conductor 2 on the No. 2 unwinding frame 12 are introduced into the twisting mechanism 8 after passing through the wire mechanism 6 and the tensioning plate 7. The longitudinal water-blocking filling strip 1, the center conductor 2 and the insulated conductor bobbin 4 are twisted into the cable core through the twisting mechanism 8. The center conductor 2 is twisted in the conductor groove 41 of the insulated conductor bobbin 4. The anti-pressure protrusion 42 is twisted and sandwiched between the two center conductors 2. The longitudinal water-blocking filling strip 1, the center conductor 2 and the insulated conductor bobbin 4 are twisted into the cable core through the twisting mechanism 8. The water-blocking filling strip 1 is twisted between two center conductors 2 to form a package, and an inner lining layer 31, an outer insulating layer 32, an armor layer 33 and an outer sheath 34 are wrapped on the outside of the cable inner core, that is, an outer protective sheath 3 is wrapped on the outside of the cable inner core to enhance the insulation, anti-interference, tensile and protection performance of the cable. An insulating conductor bobbin 4 is provided at the twisting center of the center conductor 2. A spiral conductor wire groove 41 on the insulating conductor bobbin 4 is twisted and matched with the center conductor 2 to form a pressure-resistant protrusion 42, which is compatible with the pressure-resistant channel 43 and the pressure-resistant shaft 43 provided on the insulating conductor bobbin 4. 4 cooperates with the compression-resistant support 45 to enhance the compression buffering and compression supporting properties of the cable, realize the twisting operation of the central conductor 2, the longitudinal water-blocking filling strip 1 and the insulating conductor bobbin 4, the cable twisting rotation is continuous, the load-bearing capacity is large, the transmission ratio is large and the structure is compact, the transmission is accurate, stable and noiseless, and it has self-locking properties, as well as the wire hole 64 and the ball 65 inside the tensioning hole, reduce the transportation wear of the cable twisting material, the tensioning plate 7 cooperates with the second support frame 71 and the adjustment mechanism 72 to realize the transmission tensioning adjustment of the cable twisting material, so that the cable twisting is compact.

[0039] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A water-tree resistant medium voltage insulated cable, comprising a central conductor (2), characterized in that: The central conductor (2) is provided with a plurality of them, and an insulating conductor bobbin (4) is twisted in the middle of the plurality of the central conductors (2) by a twisting device, and an outer protective sheath (3) is wrapped around the twisted outer portion of the central conductor (2), and a longitudinal water-blocking filling strip (1) is twisted and filled on the central conductor (2) inside the outer protective sheath (3) by a twisting device; A conductor groove (41) is provided on the outer side of the insulating conductor bobbin (4), and the conductor groove (41) is arranged in a spiral arc-shaped groove structure. The center conductor (2) is arranged inside the conductor groove (41), and a pressure-resistant protrusion (42) is provided on the insulating conductor bobbin (4) between two adjacent center conductors (2). The number of the conductor grooves (41) and the pressure-resistant protrusions (42) is the same as the number of the center conductors (2). A pressure-resistant channel (43) is provided in the middle of the insulating conductor bobbin (4), and a pressure-resistant shaft (44) is provided in the middle of the pressure-resistant channel (43). A pressure-resistant bracket (45) is provided in the pressure-resistant channel (43) between the insulating conductor bobbin (4) and the pressure-resistant shaft (44); The outer protective sleeve (3) comprises an inner lining layer (31), an outer insulating layer (32), an armor layer (33) and an outer sheath (34); the outer surface of the twisted central conductor (2) and the longitudinal water-blocking filling strip (1) is wrapped with the inner lining layer (31); the outer surface of the inner lining layer (31) is wrapped with the outer insulating layer (32); the outer surface of the outer insulating layer (32) is wrapped with the armor layer (33); and the outer surface of the armor layer (33) is wrapped with the outer sheath (34).

2. The water-tree resistant medium voltage insulated cable according to claim 1, characterized in that: The central conductor (2) comprises a bare copper wire (21), an inner insulating layer (22), a shielding layer (23) and an isolation layer (24); a plurality of bare copper wires (21) are provided; the outer side of the bare copper wire (21) is wrapped with an inner insulating layer (22); the outer side of the inner insulating layer (22) is wrapped with a shielding layer (23); and the outer side of the shielding layer (23) is wrapped with an isolation layer (24).

3. The water-tree resistant medium voltage insulated cable according to claim 1, characterized in that: The pressure-resistant channel (43) and the pressure-resistant axis (44) are both arranged in a regular polygonal structure, and the number of sides of the regular polygonal structure of the pressure-resistant channel (43) and the pressure-resistant axis (44) and the number of pressure-resistant brackets (45) are the same as the number of central conductors (2).

4. A water-tree resistant medium voltage insulated cable production equipment, characterized by: The invention comprises a twisting device, wherein the twisting device comprises a driving mechanism (5), a wire mechanism (6), a tensioning plate (7), a twisting mechanism (8), a No. 1 carrier (9), a No. 2 carrier (10), a No. 1 material unloading rack (11), a No. 2 material unloading rack (12), a connecting rack (13) and a material unloading wheel (14); the No. 1 carrier (9) is provided on one side of the driving mechanism (5) via the connecting rack (13); the No. 2 carrier (10) is provided on the side of the No. 1 carrier (9) away from the driving mechanism (5) via the connecting rack (13); the No. 2 carrier (10) is provided on the side of the No. 1 carrier (9) away from the No. 1 carrier (9) via the connecting rack (13); the No. 2 carrier (10) is provided on the side of the No. 1 carrier (9) away from the No. 1 carrier (9) via the connecting rack (13); the No. 2 carrier (10) is provided on the side of the No. 2 carrier (10) away from the No. 1 carrier (9) via the connecting rack (13); the No. 1 tensioning plate (7) is provided on the side of the wire mechanism (6) away from the No. 2 carrier (10) via the supporting mechanism; the tensioning plate (7) is provided on the side of the wire mechanism (6) away from the No. 2 carrier (10) A twisting mechanism (8) is provided on the side of the No. 2 carrier (10) through a bracket, a No. 2 unloading frame (12) is provided on the side of the No. 1 carrier (9) away from the No. 1 carrier (9), a No. 1 unloading frame (11) is provided on the side of the No. 1 carrier (9) away from the driving mechanism (5), a longitudinal water-blocking filling strip (1) is provided on the No. 1 unloading frame (11), a wire roller is provided on the side of the driving mechanism (5) away from the No. 1 carrier (9) through a bracket, a unloading wheel (14) is provided on the side of the wire roller away from the driving mechanism (5), an insulating conductor bobbin (4) is provided on the unloading wheel (14), and the insulating conductor bobbin (4) passes through the driving mechanism (5), the connecting frame (13), the wire mechanism (6) and the tensioning plate (7) through the wire roller, and is introduced into the twisting mechanism (8) and twisted with the longitudinal water-blocking filling strip (1) and the central conductor (2).

5. The water-tree resistant medium-voltage insulated cable production equipment according to claim 4, characterized in that: The driving mechanism (5) comprises a No. 1 support frame (51), a carrier plate (52), a driving groove (53), a limiting slide rail (54), a worm wheel (55) and a worm (56); an axial hole is provided on the No. 1 support frame (51); a driving groove (53) is provided in the middle of the No. 1 support frame (51); a carrier plate (52) is provided at one end of the connecting frame (13) away from the No. 1 carrier plate (9); the carrier plate (52) passes through the No. 1 support frame (51) through the axial hole; and the No. 1 support frame (51) on both sides of the driving groove (53) is provided with a driving groove (53). A limiting slide groove is provided, and limiting slide rails (54) are provided on the outer sides of the bearing plate (52) on both sides of the driving groove (53), and two limiting slide rails (54) are provided. The limiting slide rails (54) are slidably arranged in the limiting slide groove, and a worm gear (55) is provided on the outer circumference of the bearing plate (52) between the two limiting slide rails (54), and a worm (56) is provided on the first support frame (51) below the worm gear (55), and the worm gear (56) is meshed with the worm gear (55), and one end of the worm gear (56) is connected to the output end of the servo motor through a coupling.

6. The production equipment of water-tree resistant medium voltage insulated cable according to claim 4, characterized in that: The wire guide mechanism (6) comprises a mounting plate (61), a guide plate (62), an assembly bolt (63), a wire guide hole (64) and a ball bearing (65). The mounting plate (61) is provided at one end of the connecting frame (13) away from the second carrier plate (10). A mounting groove is provided at one side of the mounting plate (61) away from the connecting frame (13). The mounting plate (61) is provided with a mounting hole. A guide plate (62) is provided inside the mounting groove. The guide plate (62) is fixed to the mounting plate (61) by an assembly bolt (63). The guide plate (62) is provided with a wire guide hole (64). The wire guide hole (64) is provided by the mounting hole penetrating the mounting plate (61). A ball bearing (65) is provided inside the wire guide hole (64).

7. The production equipment of water-tree resistant medium voltage insulated cable according to claim 4, characterized in that: The support mechanism comprises a second support frame (71) and an adjustment mechanism (72); the second support frame (71) is provided at the bottom of the tensioning plate (7); and the adjustment mechanism (72) is provided at the bottom of the second support frame (71).

8. The production equipment of water-tree resistant medium voltage insulated cable according to claim 6, characterized in that: The tensioning plate (7) is provided with a plurality of tensioning holes which are evenly distributed and arranged at equal intervals, and a ball (65) is arranged inside each tensioning hole.

Images