CN211496453U - Composite multilayer aluminum core armored cable - Google Patents
Composite multilayer aluminum core armored cable Download PDFInfo
- Publication number
- CN211496453U CN211496453U CN201922158143.6U CN201922158143U CN211496453U CN 211496453 U CN211496453 U CN 211496453U CN 201922158143 U CN201922158143 U CN 201922158143U CN 211496453 U CN211496453 U CN 211496453U
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- clamping seat
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Abstract
The utility model discloses a compound multilayer aluminum core armoured cable, including the cable drum and twine the cable main part on the inboard surface of cable drum, the cable drum comprises a cable section of thick bamboo and the curb plate that sets up at a cable section of thick bamboo both ends, the cable main part twines on the surface of a cable section of thick bamboo, the inboard of cable drum is provided with the fixing device corresponding with cable main part tip, and fixing device includes first holder and the second holder that sets up at the inboard surface of curb plate; through the first holder that sets up, the second holder, C shape pole, the screw rod, the screw hole, rotatory handle, T shape slider, annular chute, the spring groove, flexible dop, circular draw-in groove and pull rod for cable main body is after winding the surface of a cable section of thick bamboo, can be quick fix spacingly through first holder and second holder to cable main body's tip, and can fix the tip through first holder and second holder once more after cable main body is cut one section when using.
Description
Technical Field
The utility model belongs to the technical field of the aluminium core cable, concretely relates to compound multilayer's aluminium core armoured cable.
Background
The aluminum core cable is the cable made of the aluminum core material for the cable conductor as the name implies, the price of the aluminum core cable is three to four times lower than that of the copper core cable, the weight of the aluminum core cable is 40 percent of that of the copper core cable, the construction and transportation cost is low, aluminum reacts with oxygen in the air to quickly generate an oxide film which can prevent further oxidation, and therefore the aluminum core cable is a necessary material for high-voltage, large-section and large-span overhead power transmission.
Present aluminium core cable is after processing finishes, the winding that all can the lapping is on the cable drum surface, and need fix the tip of aluminium core cable and spacing after aluminium core cable winding cable drum surface, present fixed mode generally adopts sticky tape and wiring rope to fix, but this kind of fixed mode is not convenient enough, and every aluminium core cable is cut one section back when using and just need reuse sticky tape and wiring rope to the end fixing, the consumptive material is more, there is certain drawback, we propose the aluminium core armoured cable of a compound multilayer for this reason.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a compound multilayer's aluminium core armoured cable, with the current aluminium core cable that proposes in solving above-mentioned background art after processing finishes, the winding that all can the lapping is on the cable drum surface, and need fix and spacing the tip of aluminium core cable after the aluminium core cable winding is on the cable drum surface, current fixed mode generally adopts sticky tape and ligature rope to fix, but this kind of fixed mode is not convenient enough, and every aluminium core cable is cut one section back when using and just need reuse sticky tape and ligature rope to the end fixing, the consumptive material is more, there is certain drawback problem.
In order to achieve the above object, the utility model provides a following technical scheme: a composite multilayer aluminum core armored cable comprises a cable drum and a cable main body wound on the inner side surface of the cable drum, wherein the cable drum is composed of a cable cylinder and side plates arranged at two ends of the cable cylinder, the cable main body is wound on the surface of the cable cylinder, a fixing device corresponding to the end portion of the cable main body is arranged on the inner side of the cable drum, the fixing device comprises a first clamping seat and a second clamping seat which are arranged on the inner side surface of the side plates, a C-shaped rod is fixed on the inner side surface of the first clamping seat, two ends of the C-shaped rod penetrate through two ends of the second clamping seat respectively, a screw rod is connected to the outer side surface of the second clamping seat in a rotating mode, a threaded hole corresponding to the screw rod is formed in the C-shaped rod, the top end of the screw rod penetrates through one side of the C-shaped rod, a rotating handle is arranged at the top end of the screw rod, and the end portion of the cable main body is, the outer side surface of the first clamping seat is provided with a T-shaped sliding block, an annular sliding groove matched with the T-shaped sliding block is formed in the side plate, and an adjustable limiting mechanism is arranged between the T-shaped sliding block and the side plate.
Preferably, the cable main part includes polyvinyl chloride sheath and sets up four electric wires in the polyvinyl chloride sheath is inboard, the electric wire includes polyethylene insulation layer and sets up a plurality of electrically conductive aluminium cores inside the polyethylene insulation layer, the inboard of polyvinyl chloride sheath is provided with aluminium alloy foil armor, and aluminium alloy foil armor's inboard is provided with polyester non-woven fabrics waterproof layer, polyester non-woven fabrics waterproof layer's inboard is provided with galvanized fiber net shielding layer, the polyethylene insulation layer is located galvanized fiber net shielding layer's inboard, the inboard packing of galvanized fiber net shielding layer has the graphite filler.
Preferably, a cross-shaped insulating isolation frame is arranged on the inner side of the galvanized fiber mesh shielding layer, and the four electric wires are respectively positioned at four corners of the cross-shaped insulating isolation frame.
Preferably, adjustable stop gear is including setting up the spring groove in T shape slider inside, the end connection in spring groove has flexible dop, and the inboard of annular spout has evenly seted up a plurality ofly and the corresponding circular slot of flexible dop, the top of flexible dop is located the inside of one of them circular slot, the bottom fixed surface of flexible dop has the pull rod, just the outside fixed surface of the top of pull rod and first holder.
Preferably, the top end of the T-shaped sliding block is provided with a pull hole corresponding to the pull rod, and the pull hole is communicated with the spring groove.
Preferably, the inner side surfaces of the second clamping seat and the first clamping seat are provided with arc-shaped recesses, and the arc-shaped recesses are uniformly provided with a plurality of arc-shaped anti-slip strips.
Preferably, a rotating block is fixed on the surface of the bottom end of the screw rod, a rotating seat is fixed on the surface of the outer side of the second clamping seat, a rotating groove matched with the rotating block is formed in the rotating seat, and the rotating block is located in the rotating groove.
Compared with the prior art, the beneficial effects of the utility model are that:
1. through the first holder that sets up, the second holder, C shape pole, the screw rod, the screw hole, rotatory handle, T shape slider, annular chute, the spring groove, flexible dop, circular draw-in groove and pull rod, make cable main part after twining the surface of a cable section of thick bamboo, can be quick fix spacingly through first holder and second holder to cable main part's tip, and every cable main part is cut one section back and can be fixed tip through first holder and second holder once more when using, fixed and have fixed inconvenient and the more problem of consumptive material with sticky tape and wiring rope in having avoided former device.
2. Through the aluminium alloy foil armor that sets up, can improve the holistic tensile resistance and the intensity of cable main part for the difficult fracture of cable main part, and the waterproof nature and the moisture resistance that can improve cable main part through the polyester non-woven fabrics waterproof layer that sets up, and the insulating isolation frame of cross through setting up makes the inside electric wire of cable main part can obtain effectual isolation, stability when improving the follow-up use of cable main part.
Drawings
Fig. 1 is a schematic structural view of the present invention;
FIG. 2 is an enlarged view of a portion of the area A in FIG. 1 according to the present invention;
fig. 3 is a top view of the first and second holders of the present invention;
FIG. 4 is a cross-sectional view of the junction between the T-shaped slider and the side plate of the present invention;
fig. 5 is a side view of the annular chute and the circular slot of the present invention;
FIG. 6 is an enlarged view of a portion of the area B in FIG. 5 according to the present invention;
fig. 7 is a cross-sectional view of a cable body according to embodiment 2 of the present invention;
in the figure: 1. a cable body; 2. a cable drum; 3. a side plate; 4. a first holder; 5. a second holder; 6. rotating the handle; 7. a C-shaped rod; 8. a screw; 9. a T-shaped slider; 10. a rotating base; 11. an annular chute; 12. a spring slot; 13. a pull rod; 14. an arc-shaped anti-slip strip; 15. a telescopic chuck; 16. a circular slot; 101. a polyvinyl chloride sheath; 102. an aluminum alloy foil armor layer; 103. a polyester non-woven fabric waterproof layer; 104. a galvanized fiber mesh shielding layer; 105. a graphite filler; 106. a cross-shaped insulating isolation frame; 107. a polyethylene insulating layer; 108. a conductive aluminum core.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Example 1
Referring to fig. 1 to 6, the present invention provides a technical solution: a composite multilayer aluminum core armored cable comprises a cable drum and a cable main body 1 wound on the inner side surface of the cable drum, wherein the cable drum is composed of a cable barrel 2 and side plates 3 arranged at two ends of the cable barrel 2, the cable main body 1 is wound on the surface of the cable barrel 2, a fixing device corresponding to the end portion of the cable main body 1 is arranged on the inner side of the cable drum, the fixing device comprises a first clamping seat 4 and a second clamping seat 5 which are arranged on the inner side surface of the side plates 3, a C-shaped rod 7 is fixedly welded on the inner side surface of the first clamping seat 4, two ends of the C-shaped rod 7 respectively penetrate through two ends of the second clamping seat 5, a screw rod 8 is rotatably connected on the outer side surface of the second clamping seat 5, a threaded hole corresponding to the screw rod 8 is formed in the C-shaped rod 7, the top end of the screw rod 8 penetrates to one side of the C-shaped rod 7, a rotating handle 6 is arranged at the top end of the screw rod 8, the end portion of the cable main body, make operating personnel rotate behind the rotatory handle 6 can press from both sides the tip of cable main part 1 between first holder 4 and second holder 5, the outside surface of first holder 4 is provided with T shape slider 9, and the inside of curb plate 3 offer with the annular spout 11 of T shape slider 9 looks adaptation for first holder 4 is adjustable with the position of second holder 5, is provided with adjustable stop gear between T shape slider 9 and the curb plate 3.
In this embodiment, preferably, the adjustable limiting mechanism includes the spring groove 12 disposed inside the T-shaped slider 9, the end of the spring groove 12 is connected with the telescopic chuck 15 through a spring, a plurality of circular clamping grooves 16 corresponding to the telescopic chuck 15 are uniformly disposed on the inner side of the annular chute 11, the top end of the telescopic chuck 15 is disposed inside one of the circular clamping grooves 16, so that the top end of the telescopic chuck 15 can be limited to the T-shaped slider 9, the bottom end surface of the telescopic chuck 15 is welded and fixed with the pull rod 13, and the top end of the pull rod 13 is welded and fixed to the outer side surface of the first holder 4, so that the positions of the first holder 4 and the second holder 5 can be flexibly adjusted and limited.
In this embodiment, preferably, the top end of the T-shaped slider 9 is provided with a pull hole corresponding to the pull rod 13, and the pull hole is communicated with the spring groove 12, so that the pull rod 13 can be smoothly pulled.
In this embodiment, preferably, the inner side surfaces of the second holder 5 and the first holder 4 are both provided with an arc-shaped recess, and the inside of the arc-shaped recess is uniformly provided with a plurality of arc-shaped anti-slip strips 14 through gluing, and the arc-shaped anti-slip strips 14 are rubber members, so that the end portion of the cable main body 1 can be clamped more tightly by the second holder 5 and the first holder 4, and the cable main body is not easy to fall off.
In this embodiment, preferably, a rotating block is welded and fixed on the bottom end surface of the screw rod 8, a rotating seat 10 is fixed on the outer side surface of the second clamping seat 5, a rotating groove matched with the rotating block is formed in the rotating seat 10, and the rotating block is located in the rotating groove, so that the bottom end of the screw rod 8 can be smoothly connected with the second clamping seat 5 in a rotating manner.
Example 2
Referring to fig. 1 to 7, the present invention provides a technical solution: a composite multilayer aluminum core armored cable comprises a cable drum and a cable main body 1 wound on the inner side surface of the cable drum, wherein the cable drum is composed of a cable barrel 2 and side plates 3 arranged at two ends of the cable barrel 2, the cable main body 1 is wound on the surface of the cable barrel 2, a fixing device corresponding to the end portion of the cable main body 1 is arranged on the inner side of the cable drum, the fixing device comprises a first clamping seat 4 and a second clamping seat 5 which are arranged on the inner side surface of the side plates 3, a C-shaped rod 7 is fixedly welded on the inner side surface of the first clamping seat 4, two ends of the C-shaped rod 7 respectively penetrate through two ends of the second clamping seat 5, a screw rod 8 is rotatably connected on the outer side surface of the second clamping seat 5, a threaded hole corresponding to the screw rod 8 is formed in the C-shaped rod 7, the top end of the screw rod 8 penetrates to one side of the C-shaped rod 7, a rotating handle 6 is arranged at the top end of the screw rod 8, the end portion of the cable main body, make operating personnel rotate behind the rotatory handle 6 can press from both sides the tip of cable main part 1 between first holder 4 and second holder 5, the outside surface of first holder 4 is provided with T shape slider 9, and the inside of curb plate 3 offer with the annular spout 11 of T shape slider 9 looks adaptation for first holder 4 is adjustable with the position of second holder 5, is provided with adjustable stop gear between T shape slider 9 and the curb plate 3.
In this embodiment, preferably, the cable main body 1 includes a polyvinyl chloride sheath 101 and four electric wires disposed inside the polyvinyl chloride sheath 101, each electric wire includes a polyethylene insulating layer 107 and a plurality of conductive aluminum cores 108 disposed inside the polyethylene insulating layer 107, the inner side of the polyvinyl chloride sheath 101 is provided with an aluminum alloy foil armor layer 102, the tensile strength and strength of the whole cable main body 1 are improved, the inner side of the aluminum alloy foil armor layer 102 is provided with a polyester non-woven fabric waterproof layer 103, the water resistance and moisture resistance of the cable main body 1 are improved, the inner side of the polyester non-woven fabric waterproof layer 103 is provided with a galvanized fiber mesh shielding layer 104, the polyethylene insulating layer 107 is located inside the galvanized fiber mesh shielding layer 104, and the inner side of the galvanized fiber mesh shielding layer 104 is filled with a graphite filler 105.
In this embodiment, preferably, the inner side of the galvanized fiber mesh shielding layer 104 is provided with a cross-shaped insulating isolation frame 106, the cross-shaped insulating isolation frame 106 is a flexible polyvinyl chloride member, and the four wires are respectively located at four corners of the cross-shaped insulating isolation frame 106, so that the four wires can be effectively isolated, and mutual extrusion and influence are avoided.
In this embodiment, preferably, the adjustable limiting mechanism includes the spring groove 12 disposed inside the T-shaped slider 9, the end of the spring groove 12 is connected with the telescopic chuck 15 through a spring, a plurality of circular clamping grooves 16 corresponding to the telescopic chuck 15 are uniformly disposed on the inner side of the annular chute 11, the top end of the telescopic chuck 15 is disposed inside one of the circular clamping grooves 16, so that the top end of the telescopic chuck 15 can be limited to the T-shaped slider 9, the bottom end surface of the telescopic chuck 15 is welded and fixed with the pull rod 13, and the top end of the pull rod 13 is welded and fixed to the outer side surface of the first holder 4, so that the positions of the first holder 4 and the second holder 5 can be flexibly adjusted and limited.
In this embodiment, preferably, the top end of the T-shaped slider 9 is provided with a pull hole corresponding to the pull rod 13, and the pull hole is communicated with the spring groove 12, so that the pull rod 13 can be smoothly pulled.
In this embodiment, preferably, the inner side surfaces of the second holder 5 and the first holder 4 are both provided with an arc-shaped recess, and the inside of the arc-shaped recess is uniformly provided with a plurality of arc-shaped anti-slip strips 14 through gluing, and the arc-shaped anti-slip strips 14 are rubber members, so that the end portion of the cable main body 1 can be clamped more tightly by the second holder 5 and the first holder 4, and the cable main body is not easy to fall off.
In this embodiment, preferably, a rotating block is welded and fixed on the bottom end surface of the screw rod 8, a rotating seat 10 is fixed on the outer side surface of the second clamping seat 5, a rotating groove matched with the rotating block is formed in the rotating seat 10, and the rotating block is located in the rotating groove, so that the bottom end of the screw rod 8 can be smoothly connected with the second clamping seat 5 in a rotating manner.
The utility model discloses a theory of operation and use flow: after the cable main body 1 is wound on the surface of the cable barrel 2 after being produced, the first clamping seat 4 can be laterally pulled, so that the pull rod 13 can pull the top end of the telescopic clamping head 15 to the inside of the spring groove 12, the top end of the telescopic clamping head 15 is moved out of the inside of the circular clamping groove 16 and the T-shaped sliding block 9 is not limited any more, the T-shaped sliding block 9 can slide in the annular sliding groove 11, so that the first clamping seat 4 and the second clamping seat 5 can move to the end position of the cable main body 1, then the first clamping seat 4 is loosened, a spring in the spring groove 12 pushes the telescopic clamping head 15 outwards, the top end of the telescopic clamping head 15 can be clamped in the circular clamping grooves 16 at other positions, so that the T-shaped sliding block 9 can be limited, the position adjustment of the first clamping seat 4 and the second clamping seat 5 is completed, at the moment, the end part of the cable main body 1 penetrates between the first clamping seat 4 and the second clamping seat 5, then the rotating handle 6 is rotated clockwise, so that the screw 8 pushes the second clamping seat 5 towards the first clamping seat 4 until the second clamping seat 5 and the first clamping seat 4 can completely clamp the end of the cable body 1, the end of the cable body 1 can be rapidly fixed and limited, when the cable body 1 is required to be used subsequently, the rotating handle 6 is rotated counterclockwise, so that the screw 8 pulls back the second clamping seat 5, and the second clamping seat 5 and the first clamping seat 4 do not clamp the end of the cable body 1 any more, the end of the cable body 1 can be moved out from between the first clamping seat 4 and the second clamping seat 5 and used normally, and when the cable body 1 needs to be cut off due to use, a new cable end can be formed, at this time, the first clamping seat 4 and the second clamping seat 5 can be adjusted to the end of the cable body 1 again, and the end of the cable body 1 can be fixed and limited again, so that the first clamping seat 4 and the second clamping seat 5 can be repeatedly used for multiple times;
set up aluminium alloy foil armor 102 and polyester non-woven fabrics waterproof layer 103 between polyvinyl chloride sheath 101 and zinc-plated fibre web shielding layer 104, can effectual improvement cable main body 1 holistic tensile strength and intensity, and improve cable main body 1's waterproof nature and moisture resistance, thereby increase the protection to polyethylene insulation layer 107 and conductive aluminium core 108, set up four electric wires respectively in four corners of cross insulating spacer 106 simultaneously, can make four electric wires can obtain effectual isolation, stability when improving the follow-up use of cable main body 1.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. The utility model provides a compound multilayer's aluminium core armoured cable, includes cable drum and cable main part (1) of winding at the inside surface of cable drum, the cable drum comprises cable section of thick bamboo (2) and curb plate (3) that set up at cable section of thick bamboo (2) both ends, cable main part (1) winding is on the surface of cable section of thick bamboo (2), its characterized in that: the inner side of the cable reel is provided with a fixing device corresponding to the end part of the cable main body (1), the fixing device comprises a first clamping seat (4) and a second clamping seat (5) which are arranged on the inner side surface of the side plate (3), a C-shaped rod (7) is fixed on the inner side surface of the first clamping seat (4), two ends of the C-shaped rod (7) penetrate through two ends of the second clamping seat (5) respectively, the outer side surface of the second clamping seat (5) is connected with a screw rod (8) in a rotating mode, a threaded hole corresponding to the screw rod (8) is formed in the C-shaped rod (7), the top end of the screw rod (8) penetrates through one side of the C-shaped rod (7), a rotating handle (6) is arranged at the top end of the screw rod (8), the end part of the cable main body (1) is located between the first clamping seat (4) and the second clamping seat (5), a T-shaped sliding block (9) is arranged on the outer side surface of the first clamping seat (4, and the inside of curb plate (3) is seted up annular spout (11) with T shape slider (9) looks adaptation, be provided with adjustable stop gear between T shape slider (9) and curb plate (3).
2. A composite multilayer aluminum core armored cable according to claim 1, wherein: cable body (1) includes polyvinyl chloride sheath (101) and sets up four electric wires in polyvinyl chloride sheath (101) inboard, the electric wire includes polyethylene insulation layer (107) and sets up at inside a plurality of electrically conductive aluminium cores (108) of polyethylene insulation layer (107), the inboard of polyvinyl chloride sheath (101) is provided with aluminium alloy foil armor (102), and the inboard of aluminium alloy foil armor (102) is provided with polyester non-woven fabrics waterproof layer (103), the inboard of polyester non-woven fabrics waterproof layer (103) is provided with galvanized fibre net shielding layer (104), polyethylene insulation layer (107) is in the inboard of galvanized fibre net shielding layer (104), the inboard packing of galvanized fibre net shielding layer (104) has graphite filler (105).
3. A composite multi-layer aluminium core armoured cable according to claim 2 wherein: the inner side of the galvanized fiber mesh shielding layer (104) is provided with a cross insulating isolation frame (106), and the four electric wires are respectively positioned at four corners of the cross insulating isolation frame (106).
4. A composite multilayer aluminum core armored cable according to claim 1, wherein: adjustable stop gear is including setting up spring groove (12) in T shape slider (9) inside, the end connection in spring groove (12) has flexible dop (15), and the inboard of annular chute (11) evenly sets up a plurality of circular slot (16) corresponding with flexible dop (15), the top of flexible dop (15) is located the inside of one of them circular slot (16), the bottom fixed surface of flexible dop (15) has pull rod (13), just the outside fixed surface of the top of pull rod (13) and first holder (4).
5. A composite multilayer aluminum core armored cable according to claim 1, wherein: the top end of the T-shaped sliding block (9) is provided with a pull hole corresponding to the pull rod (13), and the pull hole is communicated with the spring groove (12).
6. A composite multilayer aluminum core armored cable according to claim 1, wherein: arc-shaped depressions are formed in the inner side surfaces of the second clamping seat (5) and the first clamping seat (4), and a plurality of arc-shaped anti-slip strips (14) are uniformly arranged in the arc-shaped depressions.
7. A composite multilayer aluminum core armored cable according to claim 1, wherein: the bottom surface mounting of screw rod (8) has the rotation piece, the outside surface mounting of second holder (5) has rotation seat (10), the swivelling chute with rotatory piece looks adaptation is seted up to the inside of rotation seat (10), and the rotation piece is in the inside of swivelling chute.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922158143.6U CN211496453U (en) | 2019-12-05 | 2019-12-05 | Composite multilayer aluminum core armored cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922158143.6U CN211496453U (en) | 2019-12-05 | 2019-12-05 | Composite multilayer aluminum core armored cable |
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| Publication Number | Publication Date |
|---|---|
| CN211496453U true CN211496453U (en) | 2020-09-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922158143.6U Expired - Fee Related CN211496453U (en) | 2019-12-05 | 2019-12-05 | Composite multilayer aluminum core armored cable |
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| CN (1) | CN211496453U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113321061A (en) * | 2021-06-07 | 2021-08-31 | 湖北军龙钢业有限公司 | Steel strand wires winding mechanism |
| CN114843045A (en) * | 2022-06-10 | 2022-08-02 | 江西南远电缆有限公司 | Composite cable and production equipment thereof |
-
2019
- 2019-12-05 CN CN201922158143.6U patent/CN211496453U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113321061A (en) * | 2021-06-07 | 2021-08-31 | 湖北军龙钢业有限公司 | Steel strand wires winding mechanism |
| CN114843045A (en) * | 2022-06-10 | 2022-08-02 | 江西南远电缆有限公司 | Composite cable and production equipment thereof |
| CN114843045B (en) * | 2022-06-10 | 2022-11-25 | 江西南远电缆有限公司 | Composite cable and production equipment thereof |
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| CF01 | Termination of patent right due to non-payment of annual fee |