CN107785122A - A kind of preparation technology of seamless Through ground wire - Google Patents

A kind of preparation technology of seamless Through ground wire Download PDF

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Publication number
CN107785122A
CN107785122A CN201710849224.3A CN201710849224A CN107785122A CN 107785122 A CN107785122 A CN 107785122A CN 201710849224 A CN201710849224 A CN 201710849224A CN 107785122 A CN107785122 A CN 107785122A
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CN
China
Prior art keywords
cable core
brass tube
ground wire
hoist engine
roll
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN201710849224.3A
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Chinese (zh)
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CN107785122B (en
Inventor
李晔
陈爱华
王英华
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ZHONGTIAN ALLOY TECHNOLOGY Co Ltd
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ZHONGTIAN ALLOY TECHNOLOGY Co Ltd
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Priority to CN201710849224.3A priority Critical patent/CN107785122B/en
Publication of CN107785122A publication Critical patent/CN107785122A/en
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Classifications

    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01BCABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00Apparatus or processes specially adapted for manufacturing conductors or cables
    • H01B13/0016Apparatus or processes specially adapted for manufacturing conductors or cables for heat treatment
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01BCABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00Apparatus or processes specially adapted for manufacturing conductors or cables
    • H01B13/004Apparatus or processes specially adapted for manufacturing conductors or cables for manufacturing rigid-tube cables
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01BCABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00Apparatus or processes specially adapted for manufacturing conductors or cables
    • H01B13/22Sheathing; Armouring; Screening; Applying other protective layers
    • H01B13/224Sheathing; Armouring; Screening; Applying other protective layers by drawing a cable core into an oversized tube by means of a tow line
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01BCABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00Apparatus or processes specially adapted for manufacturing conductors or cables
    • H01B13/22Sheathing; Armouring; Screening; Applying other protective layers
    • H01B13/227Pretreatment
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01BCABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00Apparatus or processes specially adapted for manufacturing conductors or cables
    • H01B13/22Sheathing; Armouring; Screening; Applying other protective layers
    • H01B13/228After-treatment
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01BCABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00Apparatus or processes specially adapted for manufacturing conductors or cables
    • H01B13/22Sheathing; Armouring; Screening; Applying other protective layers
    • H01B13/24Sheathing; Armouring; Screening; Applying other protective layers by extrusion
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01BCABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00Apparatus or processes specially adapted for manufacturing conductors or cables
    • H01B13/22Sheathing; Armouring; Screening; Applying other protective layers
    • H01B13/24Sheathing; Armouring; Screening; Applying other protective layers by extrusion
    • H01B13/245Sheathing; Armouring; Screening; Applying other protective layers by extrusion of metal layers

Abstract

A kind of preparation technology of disclosed seamless Through ground wire, comprises the following steps:Cable core → rolling → annealing → post processing is aligned → worn to sheath.A kind of preparation technology of seamless Through ground wire provided by the invention, outer diameter sheath is reduced using the technique of rolling, not only hold facility area is small, and breakage problem caused by drawing process can be avoided, and higher speed can be realized compared to loudspeaker technique, rolling, improve processing efficiency.

Description

A kind of preparation technology of seamless Through ground wire
Technical field
The present invention relates to a kind of cleaning of copper strips, more particularly to a kind of preparation technology of seamless Through ground wire.
Background technology
Railway run-through ground line be it is a kind of by the traction power supply return system of Along Railway, power supply system, signal system, Communication and other electronic informations, building, railway roadbed, platform, bridge, tunnel, sound barrier etc. are connected what unification was grounded Cable, it can be such that each operating point earthing potential of large-scale Railway Electric system is consistent substantially, connect system equipment Ground is safe and reliable, eliminates the out-of-balance current caused by the potential difference between distinct device, realizes to personnel and equipment Effective reliable protection.
At present, classified according to Through ground wire jacket material, the Through ground wire product master of actual use has been put into There are four kinds:Sheath copper Through ground wire, aluminum alloy sheath railway run-through ground line, conductive high polymer sheath run-through ground wire, brass shield Cover Through ground wire.Wherein first three sheath has all been eliminated, and its sheath of brass sheath run-through ground wire is brass material, is compared therewith Three kinds of preceding Through ground wires, its sheath of this Through ground wire is the most environmentally friendly, and conductive discharge capacity is remote by force and first three.But it is protected Set production technology is welded using brass band is coated, so causing the uneven situation of sheath internal stress, sheath be present and opens The hidden danger split.And the oversheath of seamless type can be good at solving the problems, such as internal force inequality, sheath is avoided to ftracture.
The production technology of joint drawing, but secondary technique one side joint drawing acc power are generally used in industry at this stage Greatly, volume is big, occupation of land side and very power-consuming, and another aspect joint drawing production is needed simultaneously by three even more moulds Tool, three moulds are crossed, production and processing rate is big, is easily broken off, excessively more moulds, and production efficiency is again too low.So seamless insertion ground Line product can not form production capacity in industry.
The content of the invention
It is an object of the invention to provide a kind of preparation technology of seamless Through ground wire, reduces sheath using the technique of rolling External diameter, not only hold facility area is small, and can avoid breakage problem caused by drawing process, and compared to loudspeaker technique, Rolling can realize higher speed, improve processing efficiency.
The technical scheme is that:A kind of preparation technology of seamless Through ground wire, specifically comprises the following steps:
A, sheath is aligned:Brass tube after disk is drawn carries out straightening operation by straightener, and straightener is rectified with 20m/min speed Directly, while ensure the straight of copper pipe during rescuing and occur without flat pipe, the brass tube after aligning carries out secondary through aligns wheel Aligning sizing, two aligns wheels are laterally 3 groups of longitudinal 3 groups arrangement modes, and equally being rotated with 20m/min speed;
B, cable core is worn:The cable core that copper stranded conductor is formed is penetrated by hoist engine to the brass tube of aligning, wears and ensures cable during cable core Core is not bent, not loose stock, and is penetrated end and extended brass tube 8m, after the completion for the treatment of that cable core penetrates, will stretch out brass tube portion Cable core is first penetrated in rolling equipment, because internal diameter of copper pipe is far longer than conductor assembly outer diameter, if do not penetrated cable core is existing, can be gone out Show the situation that cable core does not follow up when copper pipe is rolled in milling train, this situation can cause finished product boring, so must incite somebody to action Cable core is first penetrated in milling train, enters milling train as tapering into for internal diameter can pass through sizing die slowly close to cable core in copper pipe Sheath is mutually close to cable core afterwards, and now cable core will move ahead together with sheath;
C, roll:Base area line gauge lattice are put down by the roll parts on milling train or all, and install sizing in roll exit position Mould, stand motor initial rate is adjusted to 5%, open emulsion and cooled down, brass tube is delivered into milling train manually enters to roll Mouthful rolled, when brass tube under the extruding force of roll it is automatic move ahead when, adjustment motor speed rises to 8%, in the operation of rolling Observe brass tube surface quality, it is ensured that brass pipe surface impulse- free robustness and overlap, stop before brass tube end reaches sizing die Machine row operation, is run to brass tube using Manual Mode and penetrates sizing die, be again started up roll and adjust motor speed extremely 15%, the ground wire that sizing die comes out carries out surface clean by rinse bath, and draws to vertical take-up stand and wound, and Ground wire head is often introduced into take-up by hand after by the 4th contact roller around once enclosing by a contact roller compression during winding Frame carries out automatic takeup, and now motor speed is promoted to 30%;
D, it is heat-treated:The Through ground wire that rolling is completed, which is sent into bell type annealing furnace, carries out annealing recrystallization, controls temperature in annealing furnace Spend for 465 DEG C, while be incubated 4 hours, cool down 7 hours, come out of the stove when in-furnace temperature is down to 65 DEG C;
E, after-combustion is post-processed:Need to carry out pickling to Through ground wire surface after the completion of annealing, remove the black dirt on surface, simultaneously Spray passivation, ensures the decay resistance on Through ground wire surface, and carries out after-combustion and operate to form finished product.
The step b's wears concretely comprising the following steps for cable core:
B1, in brass tube one end, set loads onto air-blowing joint, and steel wire rope of windlass is connected into air-blowing joint, and air-blowing joint is connected Compressed air hose is connect, while starts compressed air valve and hoist engine unwrapping wire button, using air-blowing threading method by hoist engine steel wire Rope is penetrated in copper pipe, and steel wire rope can be in exceptionally straight state after opening air valve, now adjust hoist engine speed to maximum;
B2, stop unwrapping wire when steel wire rope is worn to the brass tube other end, then consolidated cable core and head of steel wire rope using snak link It is fixed, withdraw steel wire rope by pressing hoist engine take-up button so that cable core is penetrated in brass tube, opens hoist engine by hoist engine Speed is adjusted to 10m/min, treats that cable core head enters in copper pipe, hoist engine speed is slowly improved, by 10-15-20-30m/min Set-up procedure, progressively adjust;
B3, cable core reach brass tube end when, remove air-blowing joint, reduce rolling speed until cable core be drawn out copper pipe after stop Only wind, untie the connection of steel wire rope and cable core, cable core is pulled out into 8m manually.
The preparation technology of disclosed seamless Through ground wire, its process route for threading, rolling, bell-type annealing and After-combustion, compared to the threading of routine, drawing, online annealing and after-combustion, we have been selected mill operation to substitute drawing, moved back using bell-type Fire substitutes online annealing, and for mill operation, not only floor space is small for its used milling train, can flexibly put outside, it rolls The power consumption of the low total equipment of energy consumption of machine is about 130Kw, it is often more important that, mill operation carries out brass tube using 26 groups of rolls Tube reducing and extension, reduced per working modulus together by increasing passage, so as to reduce or even prevent the possibility of disconnected pipe, rolled simultaneously Operation requires low to brass tube roundness, is being that can make its progressively rounding by roll rolling even if brass tube not rounding, this Individual is that drawing is unexistent, and drawing operates requires high to the roundness of brass tube, causes the sheath of drawing to occur if not rounding It is flat flat and cause disconnected pipe to occur.
For annealing operation, because being to carry out thermal cycle using thermal circulation fan in process of bell type annealing, ensure that in stove The uniformity of each regional temperature, so either the innermost layer of material frame or outermost layer are attained by same annealing effect, So product uniformity is good, and bell-type concentrates the return of goods to save the energy with time saving province's point.
Beneficial effect:A kind of preparation technology of disclosed seamless Through ground wire, has the advantages that:Roll Control equipment is small compared to drawing equipment floor space, and reduces the working modulus that per pass rolls by multiple tracks rolling wheel, avoids drawing Pull out the crack conditions that technique occurs;Compared to drawing process, rolling mill practice can realize higher mill speed, and roll work Skill need not carry out die change, reduce the lead-time, greatly improve production efficiency.
Embodiment
Below in conjunction with specific embodiment, clear, complete description is carried out to technical scheme.
A kind of preparation technology of disclosed seamless Through ground wire, specifically comprises the following steps:
A, sheath is aligned:Brass tube after disk is drawn carries out straightening operation by straightener, and straightener is carried out with 20m/min speed Aligning, while ensure that copper pipe is straight in straightening process and occur without flat pipe, the brass tube after aligning carries out secondary through aligns wheel Aligning sizing, two aligns wheels are laterally 3 groups of longitudinal 3 groups arrangement modes, and equally being rotated with 20m/min speed;
B, cable core is worn:The cable core that copper stranded conductor is formed penetrates the brass tube of aligning by hoist engine, after the completion for the treatment of that cable core penetrates, and The cable core that would extend out is penetrated in milling train in advance, is specifically worn cable process and is;
B1, in brass tube one end, set loads onto air-blowing joint, and steel wire rope of windlass is connected into air-blowing joint, and air-blowing joint is connected Compressed air hose is connect, while starts compressed air valve and hoist engine unwrapping wire button, using air-blowing threading method by hoist engine steel wire Rope is penetrated in copper pipe, and steel wire rope can be in exceptionally straight state after opening air valve, now adjust hoist engine speed to maximum;
B2, stop unwrapping wire when steel wire rope is worn to the brass tube other end, then consolidated cable core and head of steel wire rope using snak link It is fixed, withdraw steel wire rope by pressing hoist engine take-up button so that cable core is penetrated in brass tube, opens hoist engine by hoist engine Speed is adjusted to 10m/min, treats that cable core head enters in copper pipe, hoist engine speed is slowly improved, by 10-15-20-30m/min Set-up procedure, progressively adjust;
B3, cable core reach brass tube end when, remove air-blowing joint, reduce rolling speed until cable core be drawn out copper pipe after stop Only wind, untie the connection of steel wire rope and cable core, cable core is pulled out into 8m manually;
C, roll:Base area line gauge lattice are put down by the roll parts on milling train or all, and install sizing in roll exit position Mould, stand motor initial rate is adjusted to 5%, open emulsion and cooled down, brass tube is delivered into milling train manually enters to roll Mouthful rolled, when brass tube under the extruding force of roll it is automatic move ahead when, adjustment motor speed rises to 8%, in the operation of rolling Observe brass tube surface quality, it is ensured that brass pipe surface impulse- free robustness and overlap, stop before brass tube end reaches sizing die Machine row operation, is run to brass tube using Manual Mode and penetrates sizing die, be again started up roll and adjust motor speed extremely 15%, the ground wire that sizing die comes out carries out surface clean by rinse bath, and draws to vertical take-up stand and wound, and Ground wire head is often introduced into take-up by hand after by the 4th contact roller around once enclosing by a contact roller compression during winding Frame carries out automatic takeup, and now motor speed is promoted to 30%;
D, it is heat-treated:The Through ground wire that rolling is completed, which is sent into bell type annealing furnace, carries out annealing recrystallization, controls temperature in annealing furnace Spend for 465 DEG C, while be incubated 4 hours, cool down 7 hours, come out of the stove when in-furnace temperature is down to 65 DEG C;
E, after-combustion is post-processed:Need to carry out pickling to Through ground wire surface after the completion of annealing, remove the black dirt on surface, simultaneously Spray passivation, ensures the decay resistance on Through ground wire surface, and carries out after-combustion and operate to form finished product.
Step-by-step procedures is carried out with the brass tube rolling of S-DH35 specifications for step c:
All rolls of milling train need to all be depressed when rolling S-DH35 specifications, and sizing is installed No. 26 roll exit positions Mould;
Then the brass tube for being installed with cable core is sent into milling train, equipment motor speed is adjusted to 5%, emulsion cooling is opened, presses Lower start button, copper pipe is sent into after roll rotation and rolls mouth, rolled until roll stress brass tube moves ahead automatically, now will Motor speed is promoted to 8%, and brass tube all needs to pay close attention to copper pipe surface quality when passing through every group of roll during advancing, it is ensured that copper The situation of burr and overlap must not occur in pipe surface, because the process of rolling is that brass tube has the big mistake for diminishing while extending Journey, and the reduction of size is realized by roll intermediate groove, the size of each roll upper groove is also same descending;
Stop machine row when brass tube is reached in front of sizing die, run using Manual Mode, treat cable core and in brass tube After penetrating sizing die jointly, equipment start button is opened, is 15% by speed adjust;
The Through ground wire that artificial traction rolls out after ground wire is by rinse bath, opens cleaning agent to ground wire table by rinse bath Face is cleared up;
When ground wire reaches inverted take-up stand, Pneumatic pressure bearing up pulley is opened, the race of ground wire through Pneumatic pressure bearing up pulley is coiled in receipts In line wheel, after ground wire compresses race through first, first compression race is depressed, often runs past a compression around a circle Wheel, ground wire head is introduced into take-up inframe by hand after by the 4th contact roller, start automatic takeup, now improve complete machine electricity Machine speed is to 30%;
During Through ground wire rolls, cable core is carried out using the method for passive unwrapping wire, by the observation of meter counter, in cable core Length cuts cable core when reaching 1.5 kilometers, and complete machine speed now is promoted into 60%.
One embodiment of the invention is described in detail above, but the content is only the invention Preferred embodiment, it is impossible to be considered as the practical range for limiting the invention.It is all to be made according to the invention application range Equivalent change with improve etc., belong within the patent covering scope of the invention.

Claims (2)

1. a kind of preparation technology of seamless Through ground wire, it is characterised in that comprise the following steps:
A, sheath is aligned:Brass tube after disk is drawn carries out straightening operation by straightener, and straightener is carried out with 20m/min speed Aligning, while ensure that copper pipe is straight in straightening process and occur without flat pipe, the brass tube after aligning carries out secondary through aligns wheel Aligning sizing, two aligns wheels are laterally 3 groups of longitudinal 3 groups arrangement modes, and equally being rotated with 20m/min speed;
B, cable core is worn:The cable core that copper stranded conductor is formed is penetrated by hoist engine to the brass tube of aligning, wears and ensures cable during cable core Core is not bent, not loose stock, and is penetrated end and extended brass tube 8m, and after the completion for the treatment of that cable core penetrates, the cable core that would extend out is leading Penetrate in milling train;
C, roll:Base area line gauge lattice are put down by the roll parts on milling train or all, and install sizing in roll exit position Mould, stand motor initial rate is adjusted to 5%, open emulsion and cooled down, brass tube is delivered into milling train manually enters to roll Mouthful rolled, when brass tube under the extruding force of roll it is automatic move ahead when, adjustment motor speed rises to 8%, in the operation of rolling Observe brass tube surface quality, it is ensured that brass pipe surface impulse- free robustness and overlap, stop before brass tube end reaches sizing die Machine row operation, is run to brass tube using Manual Mode and penetrates sizing die, be again started up roll and adjust motor speed extremely 15%, the ground wire that sizing die comes out carries out surface clean by rinse bath, and draws to vertical take-up stand and wound, and Ground wire head is often introduced into take-up by hand after by the 4th contact roller around once enclosing by a contact roller compression during winding Frame carries out automatic takeup, and now motor speed is promoted to 30%;
D, it is heat-treated:The Through ground wire that rolling is completed, which is sent into bell type annealing furnace, carries out annealing recrystallization, controls temperature in annealing furnace Spend for 465 DEG C, while be incubated 4 hours, cool down 7 hours, come out of the stove when in-furnace temperature is down to 65 DEG C;
E, after-combustion is post-processed:Need to carry out pickling to Through ground wire surface after the completion of annealing, remove the black dirt on surface, simultaneously Spray passivation, ensures the decay resistance on Through ground wire surface, and carries out after-combustion and operate to form finished product.
2. the preparation technology of seamless Through ground wire according to claim 1, it is characterised in that:The step b's wears cable core Concretely comprise the following steps:
B1, in brass tube one end, set loads onto air-blowing joint, and steel wire rope of windlass is connected into air-blowing joint, and air-blowing joint is connected Compressed air hose is connect, while starts compressed air valve and hoist engine unwrapping wire button, using air-blowing threading method by hoist engine steel wire Rope is penetrated in copper pipe, and steel wire rope can be in exceptionally straight state after opening air valve, now adjust hoist engine speed to maximum;
B2, stop unwrapping wire when steel wire rope is worn to the brass tube other end, then consolidated cable core and head of steel wire rope using snak link It is fixed, withdraw steel wire rope by pressing hoist engine take-up button so that cable core is penetrated in brass tube, opens hoist engine by hoist engine Speed is adjusted to 10m/min, treats that cable core head enters in copper pipe, hoist engine speed is slowly improved, by 10-15-20-30m/min Set-up procedure, progressively adjust;
B3, cable core reach brass tube end when, remove air-blowing joint, reduce rolling speed until cable core be drawn out copper pipe after stop Only wind, untie the connection of steel wire rope and cable core, cable core is pulled out into 8m manually.
CN201710849224.3A 2017-09-20 2017-09-20 A kind of preparation process of seamless Through ground wire Active CN107785122B (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109637741A (en) * 2018-11-06 2019-04-16 通鼎互联信息股份有限公司 A kind of seamless Through ground wire production technology of railway
CN111029038A (en) * 2019-11-28 2020-04-17 上海安捷防火智能电缆有限公司 Production process of alloy ground wire

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02270226A (en) * 1989-01-28 1990-11-05 City Electrical Factors Ltd Mineral insulated cable and its manufacturing method and device
CN1862711A (en) * 2006-06-12 2006-11-15 周锡明 Novel cable and mfg. method
CN102284842A (en) * 2011-07-29 2011-12-21 赤峰京铜铜业有限公司 Processing technology for producing brass strip with special section
CN103337294A (en) * 2013-06-06 2013-10-02 江阴新华宏铜业有限公司 Railway through ground wire and preparation process thereof
CN203490967U (en) * 2013-09-23 2014-03-19 江苏东强股份有限公司 Alloy sheath through ground wire special for railway signal system
CN104464901A (en) * 2013-09-23 2015-03-25 江苏东强股份有限公司 Special alloy-sheathed through earth wire for railway signal system and manufacturing method for special alloy-sheathed through earth wire
CN104726806A (en) * 2013-12-20 2015-06-24 青岛润鑫伟业科贸有限公司 Method used for preparing seamless aluminum brass tubes
CN105057352A (en) * 2015-07-22 2015-11-18 浙江业盛新型材料有限公司 Special technological method and device for rolling special strip for tape
CN106448932A (en) * 2016-11-22 2017-02-22 湖南三泰新材料股份有限公司 Method for preparing copper-clad steel composite material

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02270226A (en) * 1989-01-28 1990-11-05 City Electrical Factors Ltd Mineral insulated cable and its manufacturing method and device
CN1862711A (en) * 2006-06-12 2006-11-15 周锡明 Novel cable and mfg. method
CN102284842A (en) * 2011-07-29 2011-12-21 赤峰京铜铜业有限公司 Processing technology for producing brass strip with special section
CN103337294A (en) * 2013-06-06 2013-10-02 江阴新华宏铜业有限公司 Railway through ground wire and preparation process thereof
CN203490967U (en) * 2013-09-23 2014-03-19 江苏东强股份有限公司 Alloy sheath through ground wire special for railway signal system
CN104464901A (en) * 2013-09-23 2015-03-25 江苏东强股份有限公司 Special alloy-sheathed through earth wire for railway signal system and manufacturing method for special alloy-sheathed through earth wire
CN104726806A (en) * 2013-12-20 2015-06-24 青岛润鑫伟业科贸有限公司 Method used for preparing seamless aluminum brass tubes
CN105057352A (en) * 2015-07-22 2015-11-18 浙江业盛新型材料有限公司 Special technological method and device for rolling special strip for tape
CN106448932A (en) * 2016-11-22 2017-02-22 湖南三泰新材料股份有限公司 Method for preparing copper-clad steel composite material

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109637741A (en) * 2018-11-06 2019-04-16 通鼎互联信息股份有限公司 A kind of seamless Through ground wire production technology of railway
CN111029038A (en) * 2019-11-28 2020-04-17 上海安捷防火智能电缆有限公司 Production process of alloy ground wire

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