CN110335717A - A kind of flame-retardant cable and processing method - Google Patents
A kind of flame-retardant cable and processing method Download PDFInfo
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- CN110335717A CN110335717A CN201910715285.XA CN201910715285A CN110335717A CN 110335717 A CN110335717 A CN 110335717A CN 201910715285 A CN201910715285 A CN 201910715285A CN 110335717 A CN110335717 A CN 110335717A
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- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
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- C08L75/00—Compositions of polyureas or polyurethanes; Compositions of derivatives of such polymers
- C08L75/04—Polyurethanes
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/0016—Apparatus or processes specially adapted for manufacturing conductors or cables for heat treatment
- H01B13/002—Apparatus or processes specially adapted for manufacturing conductors or cables for heat treatment for heat extraction
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/22—Sheathing; Armouring; Screening; Applying other protective layers
- H01B13/221—Sheathing; Armouring; Screening; Applying other protective layers filling-up interstices
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/22—Sheathing; Armouring; Screening; Applying other protective layers
- H01B13/24—Sheathing; Armouring; Screening; Applying other protective layers by extrusion
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/30—Drying; Impregnating
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/29—Protection against damage caused by extremes of temperature or by flame
- H01B7/292—Protection against damage caused by extremes of temperature or by flame using material resistant to heat
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/29—Protection against damage caused by extremes of temperature or by flame
- H01B7/295—Protection against damage caused by extremes of temperature or by flame using material resistant to flame
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/02—Flame or fire retardant/resistant
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- C—CHEMISTRY; METALLURGY
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- C08L2207/06—Properties of polyethylene
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Abstract
The invention discloses a kind of flame-retardant cable and processing methods.The flame-retardant cable includes cable main body and the sheath for being socketed on cable main body periphery, the sheath includes interior flame-retardant layer and outer fire resistant layer, it is characterized by: the inner surface of the outer fire resistant layer is provided with pre- mark of break along cable main body direction, expanded graphite is filled between the outer fire resistant layer and interior flame-retardant layer.The present invention has the sheath of inside and outside two layers of flame-retardant layer in cable main body housing tape splicing; significantly improve the anti-flammability of cable; the expanded graphite filled between interior outer fire resistant layer, expanded graphite have certain heat resistance first, secondly; cable accidental ignition and when reaching certain temperature; the volume of expanded graphite can expand increase, and due to the increase of volume, the pre- mark of break expanded graphite along outer fire resistant layer inner surface can burst outer fire resistant layer; so that outer fire resistant layer is detached from cable, cable is further protected.
Description
Technical field
The present invention relates to technical field of cables, in particular to a kind of flame-retardant cable and processing method.
Background technique
Flame retardant cable refers to that under regulation experimental condition, sample is burned, and after removing test fire source, the sprawling of flame is only
Limit range in, residual flame or it is residual burn within a limited period of time can self-extinguish cable.Past flame-retardant cable generally uses
The method that the halide containing halogen and metallic compound are added in sheath material, but this flame-retardant cable is due to containing halide
Smog and toxic gas can be generated in burning, more security risks can be brought.It is fire-retardant with the continuous improvement of scientific and technological level
Cable further develop to low halogen, Halogen it is flame-retarded.In the prior art, the patent of invention of Patent No. 201710247754.0
A kind of flame-retardant cable is disclosed, the flame-retardant cable is by being arranged cutter between interior outer fire resistant layer, and cutter will when cable is on fire
Outer fire resistant layer, which is cut, to be fallen.But cutter need to be embedded between interior outer fire resistant layer by the production of this flame-retardant cable, and production is got up more inconvenient.
Summary of the invention
The object of the present invention is to provide a kind of simple flame retardant property preferably flame-retardant cables simultaneously of production；Of the invention is another
A purpose is to provide the processing method of the flame-retardant cable.
In order to realize above-mentioned first goal of the invention, a kind of flame-retardant cable of the present invention is adopted the technical scheme that
A kind of flame-retardant cable including cable main body and is socketed on the sheath of cable main body periphery, and the sheath includes interior
The inner surface of flame-retardant layer and outer fire resistant layer, the outer fire resistant layer is provided with pre- mark of break, the outer fire resistant layer along cable main body direction
Expanded graphite is filled between interior flame-retardant layer.There is the sheath of inside and outside two layers of flame-retardant layer in cable main body housing tape splicing, hence it is evident that mention
The high anti-flammability of cable, the expanded graphite filled between interior outer fire resistant layer, expanded graphite have certain heat resistance first,
Secondly, cable accidental ignition and when reaching certain temperature, the volume of expanded graphite can expand increase, suitable due to the increase of volume
The pre- mark of break expanded graphite of outer fire resistant layer inner surface outer fire resistant layer can be burst so that outer fire resistant layer is detached from cable, further
Protect cable.
The second pre- mark of break is arranged along outer fire resistant layer inner surface annular every 50cm in the outer fire resistant layer.When cable locally catches fire
When and when needing to fall off outer fire resistant layer, spaced second pre- mark of break can guarantee to fall off least outer fire-retardant as much as possible
Layer, has saved material while guaranteeing fire-retardant.
The outer fire resistant layer includes the raw material of following parts by weight proportion, 40-50 parts of high density polyethylene (HDPE), phenolic resin
30-40 parts, 5-8 parts of polytetrafluoroethylene (PTFE), 5-15 parts of fire retardant, 1-3 parts of fire retarding synergist, 1-3 parts of stabilizer, 1-5 parts of compatilizer.
The interior flame-retardant layer includes the raw material of following parts by weight proportion, 40-60 parts of polyurethane, Corvic 30-
50 parts, 5-10 parts of fire retardant, 1-3 parts of stabilizer, 1-3 parts of antioxidant, 1-5 parts of compatilizer.
Outer fire resistant layer is different from raw material used in interior flame-retardant layer, and outer fire resistant layer uses the high density polyethylene (HDPE) and energy of heatproof
Stable phenolic resin, and the polytetrafluoroethylene (PTFE) with self-extinguishment are kept at high temperature, so that cable outermost layer will not be easily
Ground is surprisingly on fire, and the presence of fire retardant and fire retarding synergist to guarantee the use that fire retardant is reduced while flame retardant effect, drop
Low cost；Interior flame-retardant layer, as main material, ensure that cable ductility, flexibility using polyurethane and Corvic
Preferably also ensure that service life is longer simultaneously, the fire retardant and antioxidant of addition further ensure flame retardant effect.
The fire retardant is one of melamine, melamine phosphate, melamine cyanurate salt or a variety of；Institute
Stating fire retarding synergist is one or more of nano montmorillonite, diatomite, nanometer silicon carbide；The stabilizer is tribasic sulphur
One or more of lead plumbate, dibasic lead phosphite, dibasic stearic acid；The compatilizer is maleic anhydride；The antioxygen
Agent is β-(3,5- di-tert-butyl-hydroxy phenyl) propionic acid octadecanol ester, thio-2 acid double lauryls, Triphenyl phosphate
One or more.
It is halogen-free in the raw material that interior outer fire resistant layer uses and waits compounds, ensure that the environmental protection of flame-retardant cable.
In order to realize another object of the present invention, the present invention also provides a kind of processing methods of flame-retardant cable, including
Following steps,
The first step, raw material preparation weigh each raw material, 40-50 parts of high density polyethylene (HDPE), phenolic resin according to following parts by weight
30-40 parts, 5-8 parts of polytetrafluoroethylene (PTFE), 1-3 parts of fire retarding synergist, 40-60 parts of polyurethane, 30-50 parts of Corvic, resistance
Fire agent 10-25 parts, 2-6 parts of stabilizer, 1-3 parts of antioxidant, 2-10 parts of compatilizer；
Second step, upper interior flame-retardant layer is extruded using extruding machine on the outside of the cable main body of stranding, and extrusion temperature control exists
110-150 DEG C, cooling through superheated water later, cooling temperature is controlled at 40-50 DEG C, cooling through subcooled water later, cooling temperature control
System is at 10-20 DEG C, air-cooled drying later；
Third step extrudes upper outer fire resistant layer using the second extruding machine on the outside of the cable after drying, extrusion temperature control exists
120-160 DEG C, pre- mark of break and the second pre- mark of break are suppressed in outer fire resistant layer inner surface by impression device later, later through overheating
Water is cooling, and cooling temperature is controlled at 40-50 DEG C, cooling through subcooled water later, and cooling temperature is controlled at 10-20 DEG C, air-cooled later
Drying；
4th step fills expanded graphite between interior flame-retardant layer and outer fire resistant layer.
The interior flame-retardant layer is process by following method, including 40 parts of Corvics are placed in mixer, rear to add
Enter 50 parts of polyurethane, is kneaded 20min, obtains blend glue stuff, sequentially add 5 parts of fire retardants, 2 parts of antioxidant, 2 parts of stabilizers, 3 later
Part compatilizer, mixes 30min in a high speed mixer, spare.
The outer fire resistant layer is process by following method, including 40 parts of high density polyethylene (HDPE)s are placed in mixer, rear to add
Enter 40 parts of phenolic resin, add 8 parts of polytetrafluoroethylene (PTFE), be kneaded 20min, obtain blend glue stuff, 10 parts of fire retardants and 2 are added later
Part fire retarding synergist, adds 2 parts of stabilizers, is eventually adding 3 parts of compatilizers, mixes 30min in a high speed mixer, spare.
Compared with prior art, the beneficial effects of the present invention are:
1, the present invention is in sheath of the cable outer body socket comprising interior outer fire resistant layer, hence it is evident that improves the fire-retardant of cable
Property, the expanded graphite filled between interior outer fire resistant layer, expanded graphite has certain heat resistance first, has one at fire-retardant aspect
Determine effect, secondly, cable accidental ignition and when reaching certain temperature, the volume of expanded graphite can expand increase, due to volume
Increasing, the pre- mark of break expanded graphite along outer fire resistant layer inner surface can burst outer fire resistant layer, so that outer fire resistant layer is detached from cable,
Cable is further protected, by expanded graphite expansion so that outer fire resistant layer falls off, is avoided in the prior art using cutting of cutting knife
Fall the situation that cutter processing is inconvenient in outer fire resistant layer technology.
2, raw material used in interior outer fire resistant layer is different, and outer fire resistant layer uses the polytetrafluoroethylene (PTFE) cooperation with self-extinguishment resistance to
High temperature and stable high density polyethylene (HDPE) and phenolic resin is kept to ensure that cable outermost layer will not anticipate easily at high temperature
Outer on fire, fire retarding synergist cooperation fire retardant guarantees the dosage for reducing fire retardant while flame retardant effect, reduces costs；It is interior
Flame-retardant layer uses ductility, flexibility preferably polyurethane and Corvic, ensure that the service life of interior flame-retardant layer compared with
Long, the combination of fire retardant and antioxidant makes the flame retardant property of interior flame-retardant layer more excellent.
Detailed description of the invention
Fig. 1 is sectional view of the invention.
Wherein, 1 cable main body, flame-retardant layer in 2,3 outer fire resistant layers, 4 pre- marks of break, 5 expanded graphites.
Specific embodiment
With reference to embodiment, the present invention is furture elucidated, it should be understood that these embodiments are merely to illustrate this
It invents rather than limits the scope of the invention, after the present invention has been read, those skilled in the art are to of the invention various
The modification of equivalent form falls within the application range as defined in the appended claims.
As shown in Figure 1, a kind of flame-retardant cable, including cable main body and it is socketed on the sheath of cable main body periphery, it is described
Sheath includes interior flame-retardant layer and outer fire resistant layer, and the inner surface of the outer fire resistant layer is provided with pre- mark of break, institute along cable main body direction
It states between outer fire resistant layer and interior flame-retardant layer filled with expanded graphite.The outer fire resistant layer is every 50cm along outer fire resistant layer inner surface ring
The second pre- mark of break is arranged in shape.The outer fire resistant layer includes the raw material of following parts by weight proportion, 40-50 parts of high density polyethylene (HDPE),
It is 30-40 parts of phenolic resin, 5-8 parts of polytetrafluoroethylene (PTFE), 5-15 parts of fire retardant, 1-3 parts of fire retarding synergist, 1-3 parts of stabilizer, compatible
1-5 parts of agent.The interior flame-retardant layer includes the raw material of following parts by weight proportion, 40-60 parts of polyurethane, Corvic 30-
50 parts, 5-10 parts of fire retardant, 1-3 parts of stabilizer, 1-3 parts of antioxidant, 1-5 parts of compatilizer.The fire retardant is melamine, three
One of paracyanogen amine phosphate, melamine cyanurate salt are a variety of；The fire retarding synergist is nano montmorillonite, diatom
One or more of soil, nanometer silicon carbide；The stabilizer is that lead sulfate tribasic, dibasic lead phosphite, dibasic are hard
One or more of resin acid；The compatilizer is maleic anhydride；The antioxidant is β-(3,5- di-t-butyl -4- hydroxy benzenes
Base) propionic acid octadecanol ester, the double lauryl of thio-2 acid, Triphenyl phosphate one or more.
The present invention also provides the processing methods of the flame-retardant cable, include the following steps,
The first step, raw material preparation weigh each raw material, 40-50 parts of high density polyethylene (HDPE), phenolic resin according to following parts by weight
30-40 parts, 5-8 parts of polytetrafluoroethylene (PTFE), 1-3 parts of fire retarding synergist, 40-60 parts of polyurethane, 30-50 parts of Corvic, resistance
Fire agent 10-25 parts, 2-6 parts of stabilizer, 1-3 parts of antioxidant, 2-10 parts of compatilizer；
Second step, upper interior flame-retardant layer is extruded using extruding machine on the outside of the cable main body of stranding, and extrusion temperature control exists
110-150 DEG C, cooling through superheated water later, cooling temperature is controlled at 40-50 DEG C, cooling through subcooled water later, cooling temperature control
System is at 10-20 DEG C, air-cooled drying later；
Third step extrudes upper outer fire resistant layer using the second extruding machine on the outside of the cable after drying, extrusion temperature control exists
120-160 DEG C, pre- mark of break and the second pre- mark of break are suppressed in outer fire resistant layer inner surface by impression device later, later through overheating
Water is cooling, and cooling temperature is controlled at 40-50 DEG C, cooling through subcooled water later, and cooling temperature is controlled at 10-20 DEG C, air-cooled later
Drying；
4th step fills expanded graphite between interior flame-retardant layer and outer fire resistant layer.
Embodiment 1
The interior flame-retardant layer is process by following method, including 40 parts of Corvics are placed in mixer, rear to add
Enter 50 parts of polyurethane, is kneaded 20min, obtains blend glue stuff, sequentially add 5 parts of fire retardants, 2 parts of antioxidant, 2 parts of stabilizers, 3 later
Part compatilizer, mixes 30min in a high speed mixer, spare.
The outer fire resistant layer is process by following method, including 40 parts of high density polyethylene (HDPE)s are placed in mixer, rear to add
Enter 40 parts of phenolic resin, add 8 parts of polytetrafluoroethylene (PTFE), be kneaded 20min, obtain blend glue stuff, 10 parts of fire retardants and 2 are added later
Part fire retarding synergist, adds 2 parts of stabilizers, is eventually adding 3 parts of compatilizers, mixes 30min in a high speed mixer, spare.
Embodiment 2
The interior flame-retardant layer is process by following method, including 40 parts of Corvics are placed in mixer, rear to add
Enter 30 parts of polyurethane, is kneaded 20min, obtains blend glue stuff, sequentially add 5 parts of fire retardants, 1 part of antioxidant, 1 part of stabilizer, 3 later
Part compatilizer, mixes 30min in a high speed mixer, spare.
The outer fire resistant layer is process by following method, including 40 parts of high density polyethylene (HDPE)s are placed in mixer, rear to add
Enter 30 parts of phenolic resin, add 5 parts of polytetrafluoroethylene (PTFE), be kneaded 20min, obtain blend glue stuff, 5 parts of fire retardants and 1 are added later
Part fire retarding synergist, adds 1 part of stabilizer, is eventually adding 3 parts of compatilizers, mixes 30min in a high speed mixer, spare.
Embodiment 3
The interior flame-retardant layer is process by following method, including 60 parts of Corvics are placed in mixer, rear to add
Enter 50 parts of polyurethane, be kneaded 20min, obtain blend glue stuff, sequentially add later 10 parts of fire retardants, 3 parts of antioxidant, 3 parts of stabilizers,
5 parts of compatilizers, mix 30min in a high speed mixer, spare.
The outer fire resistant layer is process by following method, including 50 parts of high density polyethylene (HDPE)s are placed in mixer, rear to add
Enter 40 parts of phenolic resin, add 8 parts of polytetrafluoroethylene (PTFE), be kneaded 20min, obtain blend glue stuff, 15 parts of fire retardants and 3 are added later
Part fire retarding synergist, adds 3 parts of stabilizers, is eventually adding 5 parts of compatilizers, mixes 30min in a high speed mixer, spare.
Claims (8)
1. a kind of flame-retardant cable, including cable main body and it is socketed on the sheath of cable main body periphery, the sheath includes internal resistance
Fire layer and outer fire resistant layer, it is characterised in that: the inner surface of the outer fire resistant layer is provided with pre- mark of break along cable main body direction, described
Expanded graphite is filled between outer fire resistant layer and interior flame-retardant layer.
2. flame-retardant cable according to claim 1, it is characterised in that: the outer fire resistant layer is every 50cm along outer fire resistant layer
The second pre- mark of break is arranged in surface annular.
3. flame-retardant cable according to claim 1, it is characterised in that: the outer fire resistant layer includes following parts by weight proportion
Raw material, it is 40-50 parts of high density polyethylene (HDPE), 30-40 parts of phenolic resin, 5-8 parts of polytetrafluoroethylene (PTFE), 5-15 parts of fire retardant, fire-retardant
1-3 parts of synergist, 1-3 parts of stabilizer, 1-5 parts of compatilizer.
4. flame-retardant cable according to claim 1, it is characterised in that: the interior flame-retardant layer includes following parts by weight proportion
Raw material, 40-60 parts of polyurethane, 30-50 parts of Corvic, 5-10 parts of fire retardant, 1-3 parts of stabilizer, antioxidant 1-3
Part, 1-5 parts of compatilizer.
5. flame-retardant cable according to claim 3 or 4, it is characterised in that: the fire retardant is melamine, melamine
One of phosphate, melamine cyanurate salt are a variety of；The fire retarding synergist is nano montmorillonite, diatomite, nanometer
One or more of silicon carbide；The stabilizer is lead sulfate tribasic, in dibasic lead phosphite, dibasic stearic acid
It is one or more of；The compatilizer is maleic anhydride；The antioxidant is β-(3,5- di-tert-butyl-hydroxy phenyl) propionic acid ten
The one or more of the double lauryls of eight carbon alcohol esters, thio-2 acid, Triphenyl phosphate.
6. a kind of processing method of flame-retardant cable, it is characterised in that: include the following steps,
The first step, raw material preparation weigh each raw material, 40-50 parts of high density polyethylene (HDPE), phenolic resin 30- according to following parts by weight
40 parts, 5-8 parts of polytetrafluoroethylene (PTFE), 1-3 parts of fire retarding synergist, 40-60 parts of polyurethane, 30-50 parts of Corvic, fire retardant
10-25 parts, 2-6 parts of stabilizer, 1-3 parts of antioxidant, 2-10 parts of compatilizer；
Second step, upper interior flame-retardant layer is extruded using extruding machine on the outside of the cable main body of stranding, and extrusion temperature is controlled in 110-150
DEG C, cooling through superheated water later, cooling temperature is controlled at 40-50 DEG C, and cooling through subcooled water later, cooling temperature is controlled in 10-
20 DEG C, air-cooled drying later；
Third step extrudes upper outer fire resistant layer using the second extruding machine on the outside of the cable after drying, extrusion temperature is controlled in 120-
160 DEG C, pre- mark of break and the second pre- mark of break are suppressed in outer fire resistant layer inner surface by impression device later, it is cold through superheated water later
But, cooling temperature control is cooling through subcooled water later at 40-50 DEG C, and cooling temperature controls the air-cooled drying later at 10-20 DEG C；
4th step fills expanded graphite between interior flame-retardant layer and outer fire resistant layer.
7. the processing method of flame-retardant cable according to claim 6, it is characterised in that: the interior flame-retardant layer is by following method
It is process, including 40 parts of Corvics is placed in mixer, 50 parts of polyurethane are added afterwards, be kneaded 20min, obtain epoxy glue
Material, sequentially adds 5 parts of fire retardants, 2 parts of antioxidant, 2 parts of stabilizers, 3 parts of compatilizers later, mixes in a high speed mixer
30min, it is spare.
8. the processing method of flame-retardant cable according to claim 6, it is characterised in that: the outer fire resistant layer is by following method
It is process, including 40 parts of high density polyethylene (HDPE)s is placed in mixer, 40 parts of phenolic resin are added afterwards, add 8 parts of polytetrafluoros
Ethylene is kneaded 20min, obtains blend glue stuff, and 10 parts of fire retardants and 2 parts of fire retarding synergists are added later, add 2 parts of stabilizers,
3 parts of compatilizers are eventually adding, mix 30min in a high speed mixer, it is spare.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910715285.XA CN110335717B (en) | 2019-08-05 | 2019-08-05 | Flame-retardant cable and processing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910715285.XA CN110335717B (en) | 2019-08-05 | 2019-08-05 | Flame-retardant cable and processing method |
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| Publication Number | Publication Date |
|---|---|
| CN110335717A true CN110335717A (en) | 2019-10-15 |
| CN110335717B CN110335717B (en) | 2021-04-09 |
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| CN201910715285.XA Active CN110335717B (en) | 2019-08-05 | 2019-08-05 | Flame-retardant cable and processing method |
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Also Published As
| Publication number | Publication date |
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| CN110335717B (en) | 2021-04-09 |
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Effective date of registration: 20230607 Address after: 7 Sansheng Road, Lidian Town, Guangling District, Yangzhou City, Jiangsu Province, 225000 Patentee after: YANGZHOU GREAT WALL RAILWAY EQUIPMENT Co.,Ltd. Address before: 225000 No.9, Lidian Town Industrial Park, Guangling District, Yangzhou City, Jiangsu Province Patentee before: JIANGSU YUNHE CABLE CO.,LTD. |
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