CN102266999A - Process for manufacturing railway signal cable - Google Patents
Process for manufacturing railway signal cable Download PDFInfo
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- CN102266999A CN102266999A CN2011102174273A CN201110217427A CN102266999A CN 102266999 A CN102266999 A CN 102266999A CN 2011102174273 A CN2011102174273 A CN 2011102174273A CN 201110217427 A CN201110217427 A CN 201110217427A CN 102266999 A CN102266999 A CN 102266999A
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Abstract
The invention discloses a process for manufacturing a railway signal cable. The cable comprises a cable core, a cable core cladding layer, an aluminum sheath layer wrapped on the cable core cladding layer, and an outer sheath layer, wherein the aluminum sheath layer is made of an electric pure aluminum belt; the aluminum sheath layer is welded by a welding gun; a mixed gas which is used as a welding protection gas and consists of helium and argon is fed in a gas channel of the welding gun; and a relation between the thickness of the aluminum sheath layer and a mixing proportion of the helium to the argon is that: when the thickness of the aluminum sheath layer is 1.0 to 1.2 millimeters, 1.3 to 1.5 millimeters and 1.6 to 2.0 millimeters, the corresponding mixing proportions of the helium to the argon are (1 to 5.0)-(1 to 3.5), (1 to 3.5)-(1 to 2.0) and (1 to 2.5)-(1 to 1.7) respectively. The cable welded by the manufacturing process has high welding quality, the compactness of a welding line is high, the deformation of the welded cable is small, a region, subjected to photo-thermal influence of welding arc light, on the surface of the aluminum sheath is small, and the welding speed is high.
Description
Technical field
The present invention relates to railway signal class field of cables, be specifically related to a kind of manufacturing process of railway signal class cable.
Background technology
For improving the screening ability that the anti-external electrical field of cable disturbs, in the sheath structure of most of communication cables, railway signal class cable, be provided with the aluminium sheath structure sheaf, its major function is that cable conductor is played the electric field shielding effect, be used for improving the anti-external electrical field interference capability of cable, thereby improve the transmission stability of cable.(typical structure of aluminium sheath sections road class signal cable sees accompanying drawing 1 for details).
In the actual production process of cable, common production technology is to adopt the argon arc welding technology: i.e. the raw material electrician fine aluminium band of electrical cable aluminium sheath, through essence cut, moulding, welding, drawing school circle etc. are continuously after the process, the round aluminium sheath (seeing accompanying drawing 1) that forms sealing is coated on the cable conductor skin, haulage gear by equipment, realize working continuously of traction welding, make sealed aluminum sheath along whole cable core appearance.。
The major technique quality requirement of electrical cable aluminium sheath:
Air-tightness: i.e. aluminium sheath sealing is air tight, mainly is the integrality of examination electrical cable aluminium sheath, estimates the humidity resistance of cable.Its test method is dry air or the nitrogen that charges into 0.4 MPa in electrical cable aluminium sheath.Stable gas pressure after 6 hours pressure be not less than 0.2MPa.
The evaluation index of aluminium sheath mechanical strength is its enlarging performance and bending property, the enlarging performance is a test method in accordance with regulations, during with to enlarging 1.3 times of aluminium sheath (i.e. the aluminum pipe that intercepts from electrical cable aluminium sheath) the external diameter enlarging of cable, being seen crackle of no eyesight or defective.Bending property is a test method in accordance with regulations, and after the cable alternating bending, electrical cable aluminium sheath does not ftracture.
Therefore, when the continuous welding operation of electrical cable aluminium sheath, protective gas select for use and the size of flow size, welding current etc. all can have influence on the air-tightness of aluminium sheath and the mechanical strength of commissure, thereby have influence on the welding quality of aluminium sheath.Therefore during the aluminium sheath welding protective gas select for use welding quality most important.
Summary of the invention
The object of the invention provides a kind of manufacturing process of railway signal class cable, and the cable of this manufacturing process weld seam, its welding quality are good, the compactness height of weld seam, weldment distortion are little, aluminium sheath is surperficial is welded the regional little of arc light heat affecting and speed of welding is fast.
For achieving the above object, the technical solution used in the present invention is: a kind of manufacturing process of railway signal class cable, described cable comprises cable core, cable core belting layer, is coated on the aluminium sheath layer and the external sheath layer of this cable core belting layer, described aluminium sheath layer material is electrician's fine aluminium band, described aluminium sheath layer is welded by welding gun, and the gas passage of this welding gun is connected with as gas after the mixing of being made up of helium and argon gas of welding protection gas; Described aluminium sheath layer thickness and helium and argon gas mixed proportion relation are as follows:
The mixed proportion of aluminium sheath layer thickness scope helium/argon gas
1.0～1.2?mm 1：5.0～1：3.5
1.3～1.5?mm 1：3.5～1：2.0
1.6～2.0?mm 1：2.5～1：1.7
Related content in the technique scheme is explained as follows:
1. in the such scheme, gas flow is after mixing: 2～5 L/min.
2. in the such scheme, the chemical composition purity of described helium is: He 〉=99.9%; The chemical composition purity of described argon gas is: Ar 〉=99.9%.
Because the technique scheme utilization, the present invention compared with prior art has following advantage and effect:
1, the manufacturing process of railway signal class cable of the present invention, arc burning is stable, in the arc heat quantity set, and appearance of weld is good, the compactness of weld seam improves steady quality.
2, the manufacturing process of railway signal class cable of the present invention, during continuous welding, the regional little of arc light heat affecting welded on the aluminium sheath surface, and the weldment distortion is little, and anti-crack ability is strong, and weldquality is good, the weld strength height.Solve the weld strength problem of thicker electrical cable aluminium sheath.
3, the manufacturing process of railway signal class cable of the present invention, welding pool is little, temperature is high, soldered metal molten speed is fast, and speed of welding is fast, the production efficiency height.
4, the manufacturing process of railway signal class cable of the present invention in the electrical cable aluminium sheath weld zone, forms good excellent protection gas hood and cooling fast.
5, the manufacturing process of railway signal class cable of the present invention is eliminated the helium protection concentrated high-temperature region of welding arc down, by the heat conduction of aluminium sheath, scalds cable core in the aluminium sheath.
6, the manufacturing process of railway signal class cable of the present invention, the cost of protection usefulness gas significantly reduces during welding.
Description of drawings
Accompanying drawing 2 is railway signal class cables manufacturing schematic diagram of the present invention.
In the above accompanying drawing: 1, cable core; 2, cable core belting layer; 3, aluminium sheath layer; 4, external sheath layer; 5, welding gun; 6, gas passage; 7, inner liner; 8, steel band dress armour layer; 9, lead; 10, pad; 11, tungsten electrode capillary.
The specific embodiment
Below in conjunction with drawings and Examples the present invention is further described:
Embodiment: a kind of manufacturing process of railway signal class cable; the non-melting electrode argon arc welding solder technology is adopted in the welding of electrical cable aluminium sheath layer; its operation principle and characteristics are: electric arc is (electrical cable aluminium sheath) burning between tungsten electrode capillary 11 and the workpiece at non-melt pole; around welding arc, flow through a kind of inert gas (using argon gas usually) of the metal chemically reactive of getting along well; form a protection gas hood; make tungsten electrode capillary 11 terminations; electric arc and molten bath and the electrical cable aluminium sheath that is in high temperature do not contact with air; can prevent the oxidation of electrical cable aluminium sheath and absorb pernicious gas, thereby form fine and close soldered.
Described cable comprises cable core 1, cable core belting layer 2, is coated on the aluminium sheath layer 3 and the external sheath layer 4 of this cable core belting layer 2, described aluminium sheath layer 3 material are electrician's fine aluminium band, described aluminium sheath layer 3 is by welding gun 5 welding, and the gas passage 6 of this welding gun 5 is connected with as gas after the mixing of being made up of helium (He) and argon Ar of welding protection gas; Described aluminium sheath layer 3 thickness and helium He and argon Ar mixed proportion relation are as follows:
The mixed proportion of aluminium sheath layer thickness scope helium/argon gas
1.0～1.2?mm 1：5.0～1：3.5
1.3～1.5?mm 1：3.5～1：2.0
1.6～2.0?mm 1：2.5～1：1.7
Gas flow is after the above-mentioned mixing: 2～5 L/min (20 ℃ of 0.35MPa).
The chemical composition purity of above-mentioned helium (He) is: helium (He) 〉=99.9%; The chemical composition purity of described argon gas (Ar) is: argon gas (Ar) 〉=99.9%.
Comprise some leads 9 in the above-mentioned cable core; Outer successively inner liner 7, the steel band dress armour layer 8 of being covered with of aluminium sheath layer 3.
In the continuous welding process of the aluminium sheath layer of cable; the protective gas effect is to form the gas shield layer around welding arc and pad 10; tungsten electrode capillary 11, electric arc, molten bath and air are separated, prevent that air from causing the oxidation of soldered metal, and guarantee the arc stability burning.
The protective gas inert gas argon gas that existing weldering argon arc welding is adopted, argon gas (Ar) is the very inactive gas of a kind of chemical property, even at high temperature also get along well metal generation chemical reaction, thus a series of problems that do not have the burning scaling loss and bring thus; Argon gas also is insoluble to liquid metal, thereby can not cause pore.The phenomenon that does not at high temperature have the heat absorption of molecular breakdown or atom.The specific heat capacity and the capacity of heat transmission of argon gas are little, and promptly uptake own is little, and it is also few outwards to conduct heat, and the heat in the electric arc is difficult for scattering and disappearing, and makes the welding arc flameholding, and heat is concentrated, and helps the carrying out of welding.Arc voltage and energy density are lower, and arc burning is stable, and it is minimum to splash, suitable welding thin-sheet metal, the metal that thermal conductivity is low.Adopting argon gas is that ionization potential is higher as the shortcoming of protective gas; when arc space is full of argon gas, the comparatively difficulty of igniting of electric arc, weld strength is poor; during aluminium sheath more than throat thickness 1.0mm, the aluminium sheath performance is difficult to satisfy the technical quality requirement of product to aluminium sheath.
The thermal conductivity of inert gas helium (He) is than argon gas (Ar) height, so for given arc length and welding current, the arc voltage of helium protection is more much higher than argon gas.Helium is protected easy striking, and arc stability and soft; Therefore, arc temperature and energy density height during the helium protection, welding efficiency is higher, is applicable to the welding (aluminium sheath that 1.0mm is above) of thicker aluminium sheath, but because heliarc has the temperature height, when generating heat advantage big and concentrated, aluminium sheath heat input to the welding central point is excessive, causes the scald of cable core in the aluminium sheath easily, makes cable insulation decline damage cable, be difficult for forming the excellent protection gas hood when adopting the helium protection in addition, the protection effect is relatively poor; The cost of helium protection is higher, is about 10 times of argon gas.
The present invention is according to the design feature of railway signal class cable and to the requirement of electrical cable aluminium sheath technical quality, during continuous welding operation in the electrical cable aluminium sheath manufacture process, employing is according to the argon gas of special ratios and the mist of helium, thereby maximize favourable factors and minimize unfavourable ones, overcome shortcoming separately and both advantage of having got both.
The foregoing description only is explanation technical conceive of the present invention and characteristics, and its purpose is to allow the personage who is familiar with this technology can understand content of the present invention and enforcement according to this, can not limit protection scope of the present invention with this.All equivalences that spirit essence is done according to the present invention change or modify, and all should be encompassed within protection scope of the present invention.
Claims (3)
1. the manufacturing process of a railway signal class cable, described cable comprises cable core (1), cable core belting layer (2), is coated on the aluminium sheath layer (3) and the external sheath layer (4) of this cable core belting layer (2), described aluminium sheath layer (3) material is electrician's fine aluminium band, it is characterized in that: described aluminium sheath layer (3) is by welding gun (5) welding, and the gas passage (6) of this welding gun (5) is connected with as gas after the mixing of being made up of helium (He) and argon gas (Ar) of welding protection gas; Described aluminium sheath layer (3) thickness and helium (He) and argon gas (Ar) mixed proportion relation are as follows:
The mixed proportion of aluminium sheath layer thickness scope helium/argon gas
1.0～1.2?mm 1：5.0~1：3.5
1.3～1.5?mm 1：3.5~1：2.0
1.6～2.0?mm 1：2.5~1：1.7。
2. manufacturing process according to claim 1 is characterized in that: described mixing back gas flow is: 2～5 L/min.
3. manufacturing process according to claim 1 is characterized in that: the chemical composition purity of described helium (He) is: helium (He) 〉=99.9%; The chemical composition purity of described argon gas (Ar) is: argon gas (Ar) 〉=99.9%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102174273A CN102266999A (en) | 2011-08-01 | 2011-08-01 | Process for manufacturing railway signal cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102174273A CN102266999A (en) | 2011-08-01 | 2011-08-01 | Process for manufacturing railway signal cable |
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| CN102266999A true CN102266999A (en) | 2011-12-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011102174273A Pending CN102266999A (en) | 2011-08-01 | 2011-08-01 | Process for manufacturing railway signal cable |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115430898A (en) * | 2022-09-30 | 2022-12-06 | 江苏亨通线缆科技有限公司 | Aluminum sheath helium-free welding device, production line and method |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1465203A1 (en) * | 1964-08-11 | 1969-01-16 | Ass Elect Ind | High voltage gas pressure cables |
| WO2005046924A1 (en) * | 2003-11-12 | 2005-05-26 | Ilhung Manufacturing Co., Ltd. | Co2 welding torch for air cooling |
| CN200962352Y (en) * | 2006-09-29 | 2007-10-17 | 江苏东强股份有限公司 | High-speed signal cable for rail traffic |
| JP2008194716A (en) * | 2007-02-13 | 2008-08-28 | Nippon Steel & Sumikin Welding Co Ltd | Copper plated solid wire for gas shielded arc welding |
| CN201251955Y (en) * | 2008-12-24 | 2009-06-03 | 北京亨通斯博通讯科技有限公司 | Novel armored high interference-resistance cable |
| CN101894999A (en) * | 2010-07-15 | 2010-11-24 | 中天日立射频电缆有限公司 | 7/8' copper-aluminum composite tube radio frequency coaxial cable and preparation method thereof |
-
2011
- 2011-08-01 CN CN2011102174273A patent/CN102266999A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1465203A1 (en) * | 1964-08-11 | 1969-01-16 | Ass Elect Ind | High voltage gas pressure cables |
| WO2005046924A1 (en) * | 2003-11-12 | 2005-05-26 | Ilhung Manufacturing Co., Ltd. | Co2 welding torch for air cooling |
| CN200962352Y (en) * | 2006-09-29 | 2007-10-17 | 江苏东强股份有限公司 | High-speed signal cable for rail traffic |
| JP2008194716A (en) * | 2007-02-13 | 2008-08-28 | Nippon Steel & Sumikin Welding Co Ltd | Copper plated solid wire for gas shielded arc welding |
| CN201251955Y (en) * | 2008-12-24 | 2009-06-03 | 北京亨通斯博通讯科技有限公司 | Novel armored high interference-resistance cable |
| CN101894999A (en) * | 2010-07-15 | 2010-11-24 | 中天日立射频电缆有限公司 | 7/8' copper-aluminum composite tube radio frequency coaxial cable and preparation method thereof |
Non-Patent Citations (1)
| Title |
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| 席菲菲等: "高压电力电缆皱纹铝护套挤制工艺探讨", 《电力电缆》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115430898A (en) * | 2022-09-30 | 2022-12-06 | 江苏亨通线缆科技有限公司 | Aluminum sheath helium-free welding device, production line and method |
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Application publication date: 20111207 |