CN101315821A - Copper sheath calendering method in large size mineral insulation fireproof cable production - Google Patents
Copper sheath calendering method in large size mineral insulation fireproof cable production Download PDFInfo
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- CN101315821A CN101315821A CNA2007100938375A CN200710093837A CN101315821A CN 101315821 A CN101315821 A CN 101315821A CN A2007100938375 A CNA2007100938375 A CN A2007100938375A CN 200710093837 A CN200710093837 A CN 200710093837A CN 101315821 A CN101315821 A CN 101315821A
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- high frequency
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- fireproof cable
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- protecting sleeve
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Abstract
The invention relates to a method for extending a copper protecting sleeve in preparation of a fireproof cable, in particular to a method for rolling the copper protecting sleeve in the preparation of a long length mineral insulation fireproof cable. The invention mainly solves the technical problems that the cable length is restricted and transition joints are needed in the production of the existing drawing molding cable. The invention adopts the technical proposal that: the method for rolling the copper protecting sleeve in the preparation of the long length mineral insulation fireproof cable comprises the following steps: a. a first rolling is carried out to the copper protecting sleeve filled with magnesia powder, and then high frequency annealing is carried out; b. the copper protecting sleeve is subjected to a second rolling after being cooled in a cooling tank, a third rolling is carried out continuously, and then the second high frequency annealing is carried out; and c. the copper protecting sleeve is subjected to a fourth rolling after being cooled in the cooling tank, and then the copper protecting sleeve is cooled in the cooling tank after the third high frequency annealing is carried out. The method of the invention is mainly used for manufacturing the super long fireproof cable without transition joints.
Description
Technical field:
The present invention relates to copper sheath extension method, the particularly calendering process of copper sheath in a kind of preparation of large size mineral insulation fireproof cable in a kind of preparation of fireproof cable.
Background technology:
Increase year by year along with electrical fire incidence in the fire generation, according to statistics in the nineteen ninety-five whole nation ten conflagration cases, electrical fire accounts for 80%, therefore urgent day by day to the electric wire fire protection requirement, the fireproof cable of domestic production at present all adopts traditional mineral insulation copper sheath drawing process, have following shortcoming: the length of 1, producing cable is short, the only tens of rice of larger cross-section maximum length, when laying many transition joints need be arranged, not only the expense height, to lay difficulty big, and increased the operating potential faults of cable greatly.2, the cable material utilance of drawing process is low, and loss is big, the cable cost height, and average waste of material is 4.2%, product percent of pass is up to 85%.3, the repeatedly electric furnace annealing in the cable drawing process, electric energy consumption is with big, and average power drawn accounts for 60% of fuels and energy.In view of above situation, the popularization of the fireproof cable of traditional drawing process production and use all have been subjected to certain restriction.
Summary of the invention:
The calendering process that the purpose of this invention is to provide copper sheath in a kind of preparation of large size mineral insulation fireproof cable.Mainly solve the technical problem that cable length in the existing drawing moulding cable production was restricted, needed transition joint.
Technical scheme of the present invention is: the calendering process of copper sheath in the preparation of large size mineral insulation fireproof cable may further comprise the steps:
A, the copper sheath of can magnesia powder is carried out the first road roll-in, carry out high frequency annealing then;
B, after cooling bath cooling, carry out the second road roll-in, proceed the 3rd road roll-in then, carry out the high frequency annealing second time again;
C, after cooling bath cooling, carry out the 4th road roll-in, carry out the laggard cooling bath cooling of high frequency annealing for the third time again.
Total calendering rate of 4 road roll-ins is controlled at respectively: 49%, 40%, 42%, 40%.640 ℃～660 ℃ of rolling back, first road high frequency annealing temperature ranges, control line speed 6～8m/min, 610 ℃～630 ℃ of rolling back, the 3rd road high frequency annealing temperature ranges, control line speed 20～30m/min, 580 ℃～600 ℃ of the rolling after annealing temperature ranges in the 4th road, control line speed 40～50m/min.
The invention has the beneficial effects as follows: through the roll-in processing of several roads roll process, the attenuation of copper sheath reduced, the length elongation, magnesium oxide insulation and copper conductor dwindle elongation synchronously, present good plasticity.When cable under external force, when its circular section permanent deformation reached 1/3-1/2, the mechanical strength and the insulation property of cable remained unchanged.Cable has good pliable and tough and robustness, stand stubborn, twine, draw, curved.
Embodiment:
The calendering process of copper sheath in the preparation of large size mineral insulation fireproof cable may further comprise the steps:
A, the copper sheath of can magnesia powder is carried out the first road roll-in, carry out high frequency annealing then;
B, after cooling bath cooling, carry out the second road roll-in, proceed the 3rd road roll-in then, carry out the high frequency annealing second time again;
C, after cooling bath cooling, carry out the 4th road roll-in, carry out the laggard cooling bath cooling of high frequency annealing for the third time again.
Four road milling trains are respectively 1#, 2#, 3#, 4# milling train, and the 1# milling train is 11.3KW * 7, and the 2# milling train is 11.3KW * 14, and 3#, 4# milling train are 37.6KW, and the calendering rate is set and seen the following form 1 in the cable spreading deformation process: wherein the calendering rate of 4# milling train is set with the 2# milling train.
Table 1: the calendering rate is set in the cable spreading deformation process
First and third high frequency annealing device is 125KW10KHz, and the high frequency annealing device is 250KW10KHz for the second time.640 ℃～660 ℃ of rolling back, first road high frequency annealing temperature ranges, control line speed 6～8m/min, 610 ℃～630 ℃ of rolling back, the 3rd road high frequency annealing temperature ranges, control line speed 20～30m/min, 580 ℃～600 ℃ of the rolling after annealing temperature ranges in the 4th road, control line speed 40～50m/min.
Claims (3)
1, the calendering process of copper sheath in the preparation of large size mineral insulation fireproof cable may further comprise the steps:
A, the copper sheath of can magnesia powder is carried out the first road roll-in, carry out high frequency annealing then;
B, after cooling bath cooling, carry out the second road roll-in, proceed the 3rd road roll-in then, carry out the high frequency annealing second time again;
C, after cooling bath cooling, carry out the 4th road roll-in, carry out the laggard cooling bath cooling of high frequency annealing for the third time again.
2, the calendering process of copper sheath in the preparation of large size mineral insulation fireproof cable according to claim 1 is characterized in that, total calendering rate of 4 road roll-ins is controlled at respectively: 49%, 40%, 42%, 40%.
3, the calendering process of copper sheath in the preparation of large size mineral insulation fireproof cable according to claim 1, it is characterized in that, 640 ℃～660 ℃ of rolling back, first road high frequency annealing temperature ranges, control line speed 6～8m/min, 610 ℃～630 ℃ of rolling back, the 3rd road high frequency annealing temperature ranges, control line speed 20～30m/min, 580 ℃～600 ℃ of the rolling after annealing temperature ranges in the 4th road, control line speed 40～50m/min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100938375A CN101315821A (en) | 2007-05-29 | 2007-05-29 | Copper sheath calendering method in large size mineral insulation fireproof cable production |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100938375A CN101315821A (en) | 2007-05-29 | 2007-05-29 | Copper sheath calendering method in large size mineral insulation fireproof cable production |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101315821A true CN101315821A (en) | 2008-12-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007100938375A Pending CN101315821A (en) | 2007-05-29 | 2007-05-29 | Copper sheath calendering method in large size mineral insulation fireproof cable production |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101315821A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103440934A (en) * | 2013-08-23 | 2013-12-11 | 江苏远方电缆厂有限公司 | Technology and device for machining copper protection sleeve of strip-shaped mineral insulated cable in softening mode |
| CN103714911A (en) * | 2013-12-26 | 2014-04-09 | 上海安捷防火电缆有限公司 | Mineral fireproof cable rolling manufacturing method and rolling mill |
-
2007
- 2007-05-29 CN CNA2007100938375A patent/CN101315821A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103440934A (en) * | 2013-08-23 | 2013-12-11 | 江苏远方电缆厂有限公司 | Technology and device for machining copper protection sleeve of strip-shaped mineral insulated cable in softening mode |
| CN103714911A (en) * | 2013-12-26 | 2014-04-09 | 上海安捷防火电缆有限公司 | Mineral fireproof cable rolling manufacturing method and rolling mill |
| CN103714911B (en) * | 2013-12-26 | 2016-05-18 | 上海安捷防火智能电缆有限公司 | A kind of mineral fireproof cable rolling preparation method and roller mill |
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| C06 | Publication | ||
| PB01 | Publication | ||
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| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20081203 |