CN1068383C

CN1068383C - Electrically direct-heating apparatus for in-line continuous bright annealing of stainless steel band

Info

Publication number: CN1068383C
Application number: CN99112345A
Authority: CN
Inventors: 江明榆
Original assignee: Individual
Current assignee: Individual
Priority date: 1999-07-29
Filing date: 1999-07-29
Publication date: 2001-07-11
Anticipated expiration: 2019-07-29
Also published as: CN1249351A

Abstract

The present invention relates to devices of an electric direct-heating type used for the on-line continuous brightening annealing treatment of a stainless steel belt, which belong to metal heat treatment and are used for the brightening continuous annealing treatment of a stainless steel belt, a common steel belt, a copper belt, etc., on a production line. The present invention is characterized in that the devices are composed of an uncoiling machine, an annealing furnace of an electric direct-heating type, a transformer, an ammonia cylinder, an ammonia decomposing furnace, a heater containing a catalyst and arranged in the ammonia decomposing furnace, a soaking furnace, a cooler and a dry-blowing device. The present invention has the advantages of simple structure, convenient and safe installation, use and operation, high heat efficiency of the electric direct-heating treatment, electric saving, etc. The brightening continuous annealing treatment can be carried out to the belts made of stainless steel, common steel, copper, etc., on the production line, and the length of a heating furnace can be shortened.

Description

The electrically direct-heating apparatus for in-line continuous bright annealing of stainless steel band

A kind of electrically direct-heating apparatus for in-line continuous bright annealing of stainless steel band belongs to metal heat treatmet annealing device technical field, is mainly used in to make stainless strip annealing and the maintenance light before being welded into pipe that is on the tinuous production; Also can be used for common steel band, the online bright continuous annealing of copper strips and aluminium strip continuous annealing (non-light is handled).

In the prior art, for the ease of to the stainless strip welding, generally all earlier with special annealing device band is carried out anneal before reaching the standard grade and be rolled into volume later on again, just reach the standard grade then, annealing heating simultaneously is to adopt electricradiator to generate heat band is carried out thermal radiation.So not only operation is loaded down with trivial details, wasting manpower and material resources and time, and also heating efficiency is low, the waste electric energy, and the original light of stainless strip also can be affected simultaneously.Find no through update search online stainless strip or other similar bands are carried out anneal and can make it continue to keep the annealing technology of surface-brightening.

The object of the present invention is to provide a kind of simple in structure, install and use that operation is all convenient, safety, the big electric current of ultralow pressure directly can be led to and need heating piecemeal continuously on the online stainless strip of annealed, the heating efficiency height, power saving, the not oxidation of strip surface after the heating can be made, the electrically direct-heating apparatus for in-line continuous bright annealing of stainless steel band that continues to keep its surface brightness after the strand-anneal(ing) can be made again.

According to the ultimate principle of metal anneal with to the particular requirement of strip surface afterwards of annealing, at existing questions in the prior art, basic design of the present invention is: guide into after stainless strip is by the Abrollhaspel uncoiling on the passage of welding plant on the production line electrically direct-heating annealing furnace is set, it is depressurized to ten volts with interior ultralow pressure power supply by transformer with three-phase electricity, and this low-voltage and high-current is directly led on the one section stainless strip L that is positioned at annealing furnace by the conductive electrode of lead and special construction, make this section band L reach annealing temperature by its internal resistance RL heating, after keeping one section annealing time through thereafter soaking pit insulation soaking, cool off again and dry up; Between above-mentioned annealing furnace and transformer, be provided with one again and also by above-mentioned transformer-supplied, fill the ammonia destruction furnace of the well heater of catalyzer in being equipped with in it, make ammonia (NH by ammonia bottle confession ammonia ₃) resolve into H ₂And N ₂Gas mixture after feed in the above-mentioned annealing furnace H wherein ₂Play reductive action, with the O in the stove ₂Combine and generate H ₂O makes the not oxidation of strip surface after the heating, N ₂Shield, make to keep light after the strand-anneal(ing).Along with band constantly advancing on production line, the whole piece band is able to continuous annealing piecemeal.

Electrically direct-heating apparatus for in-line continuous bright annealing of stainless steel band of the present invention, it is characterized in that this equipment by operation successively successively by strip uncoiler 1, electrically direct-heating annealing furnace 2 and be positioned at it and nearby constitute for the ammonia destruction furnace 7 of ammonia and its built-in heater 8 with for 2 and 8 above-mentioned transformer 3, soaking pit 4, water cooler 5 and the blowing dryers 6 of powering by ammonia bottle 9, be connected by lead between the well heater 8 in above-mentioned transformer 3 and above-mentioned electrically direct-heating annealing furnace 2 and the ammonia destruction furnace 7, be connected by pipeline between above-mentioned ammonia destruction furnace 7 and ammonia bottle 9 and the annealing furnace 2.

Be filled with ammonia decomposition catalyzer 10 in the well heater 8 in above-mentioned ammonia destruction furnace 7.

Advantage of the present invention is simple in structure, install and use that operation is all convenient, safety, can on production line, carry out bright continuous annealing to stainless strip, ordinary steel band, copper strip etc., also to aluminum strip continuous annealing (non-light is handled), owing to be that low-voltage and high-current is directly led to heating continuously piecemeal on a bit of band, not only thermo-efficiency height, power saving, but also time saving and energy saving, again owing to add H in the annealing furnace ₂And N ₂Gas mixture, both can make the not oxidation of strip surface after the annealing, help welding, make annealing back band keep original light again.Compare with existing annealing technology, process furnace length can shorten 5～6 times, and economize on electricity is more than at least 50%.

Accompanying drawing is installed configuration schematic diagram for one of most preferred embodiment of the present invention one-piece construction.

Further describe constitutional features of the present invention as follows with most preferred embodiment in conjunction with the accompanying drawings: stainless strip is double Abrollhaspel 1 uncoiling of 500kg with load-bearing earlier before reaching the standard grade, and one twists in line annealing, and another volume is standby; The band of having gone up production line after the uncoiling passes through successively again: be located at before the jig on the production line, 1.2 meters of power 40kw, length, band conductive segment L=1 rice wherein, one end is established bronze medal graphite brush, the other end is established a pair of copper alloy roller, water flowing cooling in the roller, the heating top temperature can reach 1000 ℃ and its nearby be provided with by ammonia bottle 9 for ammonia, in adorn a stainless steel cylinder, adorn ammonia decomposition catalyzer 10 again in the tube, the well heater 8 that imports current flow heats from the tube two ends also is connected with ammonia bottle 9 with it by flexible pipe respectively, per hour can decompose 0.5m ³Ammonia destruction furnace 7 and elementary be three-phase alternating current 380V, secondary is that two groups of 0～10V are adjustable, total power 50KW and by lead respectively with its in electrically direct-heating annealing furnace 2, the electrothermic type heating of the transformer 3 that is connected with pair roller and well heater 8 cylindrical shell two ends of L two ends brush, 800 ℃ of top temperatures, total power 20KW, long 1 meter soaking pit 4, spray water slot type water cooler 5 and the hot blast cutter formula blowing dryer 6 that the cooling residuary water is dried up.

Change as present embodiment:

1, the length of annealing furnace the and wherein length of band conductive segment and the electrode structure form etc. of introducing electric current all can suitably change;

2, the starting material of ammonia destruction furnace internal heater and structure formation also can suitably change;

3, when for example aluminum strip that does not need to ask surface-brightening is carried out online anneal, but ammonia destruction furnace and interior well heater and all write ofves of catalyzer thereof, and transformer secondary output has only one group to get final product.

Claims

1, a kind of electrically direct-heating apparatus for in-line continuous bright annealing of stainless steel band, it is characterized in that this equipment by operation successively successively by strip uncoiler [1], electrically direct-heating annealing furnace [2] and be positioned at its nearby by ammonia bottle [9] for the ammonia destruction furnace [7] of ammonia and its built-in heater [8] be above-mentioned [2] transformer [3] with [8] power supply, soaking pit [4], water cooler [5] and blowing dryer [6] constitute, be connected by lead between the well heater [8] in above-mentioned transformer [3] and above-mentioned electrically direct-heating annealing furnace [2] and the ammonia destruction furnace [7], be connected by pipeline between above-mentioned ammonia destruction furnace [7] and ammonia bottle [9] and the annealing furnace [2].

2, electrically direct-heating apparatus for in-line continuous bright annealing of stainless steel band according to claim 1 is characterized in that being filled with ammonia decomposition catalyzer [10] in the well heater [8] in above-mentioned ammonia destruction furnace [7].