CN101250678B - Low stove pressure convection continuous roller bottom type annealing furnace and annealing technique - Google Patents
Low stove pressure convection continuous roller bottom type annealing furnace and annealing technique Download PDFInfo
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- CN101250678B CN101250678B CN2008100198534A CN200810019853A CN101250678B CN 101250678 B CN101250678 B CN 101250678B CN 2008100198534 A CN2008100198534 A CN 2008100198534A CN 200810019853 A CN200810019853 A CN 200810019853A CN 101250678 B CN101250678 B CN 101250678B
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Abstract
The invention relates to a low furnace pressure convective continuous roller hearth type annealing furnace, which comprises a charging magazine, a heating chamber, a strong cooling chamber and a roller way driving system, wherein an internal circulation draught fan and a plurality of heating elements are arranged in the heating chamber, both an air inlet and an air outlet of the internal circulation draught fan are located in a furnace body of the heating chamber, the air inlet is vertical to the plane of a roller way, the air outlet is parallel to the plane of the roller way, an external circulation draught fan, a heat exchanger and a baffle plate are arranged in the strong cooling chamber, the baffle plate is located in the middle portion of the furnace body of the strong cooling chamber, the roller way is located between the heat exchanger and the baffle plate, an upper opening and a lower opening are respectively opened on the top and the bottom of the furnace body of the strong cooling chamber, the air inlet of the external circulation draught fan is communicated with the upper opening, the air outlet of the external circulation draught fan is connected with the lower opening through a connecting pipe which is arranged outside the strong cooling chamber, the complex number of nozzles are evenly distributed on the baffle plate, and the upper portion and the lower portion of the furnace body of the strong cooling chamber are communicated only through a complex number of nozzles. The annealing furnace of the invention has the advantages of even heating, rapid cooling, high efficiency and the like.
Description
Technical field
The invention belongs to non-ferrous metal heat treatment technics field, particularly relate to the annealing complete processing of a kind of suitable copper and copper alloy intervalve, and a kind of low furnace pressure strong convection continuous roller bottom type bright annealing oven.
Background technology
In recent years, along with fast development of Chinese economy, China YouSe metallic copper processing industry is constantly grown up, turnout constantly enlarges, wherein the processing of prolong has become one of leading product of domestic main copper processing enterprise, and prolong is a kind of important materials that heat exchange condensers such as thermal power generation, naval vessel, sea water desaltination, sugaring, salt manufacturing, chemical industry, nuclear power are used.The reliability of prolong directly influences whole generating unit safety and economical operation, and therefore the processing and manufacturing to prolong requires harsh, wherein the most key with the process annealing and the finished products technology of prolong.
Copper-alloy pipe-material adopts coil pipe to stretch or the continuously elongated explained hereafter of associating cold drawing bench at present: extrusion tube blank → rolling → continuous annealing → finished product stretching → finished products.This technology has the advantages that flow process is short, level of automation is high, lumber recovery is high, yet because in the continuous annealing process, the internal stress of workpiece can't all be eliminated, after the annealing, is prone to the problem of fracture in the cold drawing process usually.In addition, conventional art equipment mostly is cycle pot furnace or network chain formula retort furnace continuously greatly, can't satisfy the annealing requirement of overlength prolong particularly (middle, and production tube), and this also is the technical barrier that the present invention puts forth effort to overcome.
Summary of the invention
The objective of the invention is to overcome deficiency of the prior art, provide a kind of and can shorten annealing time, reduction thermal losses, can better improve the annealing furnace and the annealing process of the cold drawn performance of copper pipe simultaneously.
The technical solution adopted in the present invention is: a kind of low furnace pressure strong convection continuous roller bottom type annealing furnace, comprise the charging platform that sets gradually, heating chamber, strong cold house and the roller-way transmission system that runs through described annealing furnace, in the described heating chamber, on the roller-way, following both sides are evenly distributed with a plurality of heating units, described heating chamber and strong cold house are respectively arranged with internal recycle blower fan and outer circulation blower fan, in described heating chamber: the blast inlet of described internal recycle blower fan and air outlet all are positioned at the heating chamber body of heater, and described blast inlet is perpendicular to plane, roller-way place, described air outlet parallel with plane, roller-way place; In described strong cold house, be provided with heat exchanger and dividing plate, described dividing plate is positioned at the middle part of strong cold house body of heater, described roller-way is between described heat exchanger and dividing plate, the top and the bottom of described strong cold house body of heater offer upper shed and lower opening respectively, the blast inlet of described outer circulation blower fan is connected with described upper shed, the air outlet of described outer circulation blower fan links to each other with described lower opening by the pipe connecting that is arranged on outside the strong cold house, be evenly distributed with a plurality of nozzles on the described dividing plate, the upper and lower of described strong cold house body of heater is only by the gas connection mutually of described a plurality of nozzles.
The present invention further technical scheme is: described annealing furnace also include the cup between described charging platform and the described heating chamber, between described heating chamber and described strong cold house first back chamber and the water cooling chamber, be positioned at the second posterior cell and the discharge pedestal of described strong cold house rear side, be provided with the choke curtain between the body of heater of described cup, heating chamber, chamber, first back, water cooling chamber, strong cold house and second posterior cell, the ingress of described cup and the exit of second posterior cell also are provided with the choke curtain.
Described heating chamber is divided into the district of a plurality of mutual separations, between the body of heater in described each district internal gas flow flow deflector and choke curtain is set, and is provided with the internal recycle blower fan in the body of heater in described each district, forms independently airflow circulation in the body of heater in described each district.
In described heating chamber; also be placed with equably between described heating unit and the body of heater and be parallel to roller-way place planar shielding gas spray tube; and evenly offer a plurality of jet holes on the described spray tube, the parallel and plane, roller-way place of the medullary ray of described jet hole.
Described internal recycle blower fan and outer circulation blower fan all have: rotating shaft, the pedestal that is used to this rotating shaft is therefrom passed, two sealing-rings of top and bottom that are installed in this pedestal; described pedestal is provided with recess with the contacted face of rotating shaft; form the sealing gland chamber of twisted rotary shaft between described recess, sealing-ring and the rotating shaft; also being provided with on the described pedestal is used to circulate protects the passage of gas; one end of this passage and the gas connection mutually of the source of the gas of shielding gas, the other end and described sealing gland chamber gas mutually are communicated with.
In addition, the present invention also provides a kind of low furnace pressure strong convection continuous annealing process, it mainly is in order workpiece to be sent into successively cup to carry out preheating, send into heating chamber heating and insulation setting-up time, at last workpiece being sent into cooled region cools off, described heating chamber and strong cold house are respectively arranged with internal recycle blower fan and outer circulation blower fan, in described heating chamber: the blast inlet of described internal recycle blower fan and air outlet all are positioned at the heating chamber body of heater, and described blast inlet is perpendicular to plane, roller-way place, described air outlet parallel with plane, roller-way place; In described strong cold house, be provided with heat exchanger and dividing plate, described dividing plate is positioned at the middle part of strong cold house body of heater, described roller-way is between described heat exchanger and dividing plate, the top and the bottom of described strong cold house body of heater offer upper shed and lower opening respectively, the blast inlet of described outer circulation blower fan is connected with described upper shed, the air outlet of described outer circulation blower fan links to each other with described lower opening by the pipe connecting that is arranged on outside the strong cold house, be evenly distributed with a plurality of nozzles on the described dividing plate, the upper and lower of described strong cold house body of heater is only by the gas connection mutually of described a plurality of nozzles.
The present invention compared with prior art has following advantage:
1, strong convection, even pressure type nozzle technology are adopted in the cooling zone, can guarantee the strong cooling of system and the high stability of internal gas flow;
2, heating chamber is divided into a plurality of independent control areas according to the throughput requirement, and each district is provided with the strong convection recirculation blower separately, heats independent PID and controls automatically, can guarantee furnace temperature stable, evenly reach efficient heat transfer;
3, the cooling zone is in series by a plurality of water jackets unit and strong convection cooling unit according to the throughput requirement;
4, the heating chamber spray tube of arranging, and make spray tube be parallel to the roller-way injecting protective gas, can guarantee all even stable of furnace atmosphere;
5, discharge pedestal adopts lifting chain automatic horizontal to shift, softly is with on-line automatic rewinding technology, can guarantee the automatic transfer of material and is not bumped, abrades;
6, the choke curtain is set between each body of heater, can effectively reduces the interference in air flow of attachment areas between the adjacent body of heater, improve thermo-efficiency.
7, by the sealing gland chamber is set, make the dynamic seal of blower fan axle head, can guarantee the thermal treatment quality of workpiece, improve furnace thermal efficiency.
Description of drawings
Accompanying drawing 1 is the front view of annealing furnace of the present invention;
Accompanying drawing 2 is the front view of strong cold house of the present invention;
Accompanying drawing 3 is the right view of strong cold house of the present invention;
Accompanying drawing 4 is the sectional view of heating chamber of the present invention;
Accompanying drawing 5 is the partial enlarged drawing of heating chamber of the present invention;
Accompanying drawing 6 is the sectional view of spray tube of the present invention;
Accompanying drawing 7 is the enlarged view of the sleeve sealing structure of outer circulation blower fan;
Accompanying drawing 8 is the partial enlarged drawing at A place in the accompanying drawing 7;
Wherein: 1, charging platform; 2, cup; 3, heating chamber; 31, internal recycle blower fan; 311, inlet mouth; 312, air outlet; 32, heating unit; 33, flow deflector; 34, choke curtain; 35, spray tube; 351, jet hole; 4, chamber, first back; 5, water cooling chamber; 6, strong cold house; 61, outer circulation blower fan; 611, blast inlet; 612, air outlet; 613, pipe connecting; 614, rotating shaft; 615, pedestal; 616, sealing gland chamber; 618, passage; 619, recess; 610, sealing-ring; 62, dividing plate; 621, nozzle; 63, heat exchanger; 64, choke curtain; 65, upper shed; 66, lower opening; 7, second posterior cell; 8, discharge pedestal; 9, carrying roller;
Embodiment
Referring to accompanying drawing 1 to accompanying drawing 6, a kind of low furnace pressure strong convection continuous roller bottom type annealing furnace, comprise charging platform 1, cup 2, heating chamber 3, chamber 4, first back, water cooling chamber 5, strong cold house 6, second posterior cell 7, discharge pedestal 8 that sets gradually and the roller-way transmission system that runs through described annealing furnace, the concrete structure of its each several part is:
1, roller-way transmission system: form by a plurality of carrying rollers 9 and with gear unit, chain and motor etc. that described a plurality of carrying rollers 9 are in transmission connection mutually, described a plurality of carrying roller 9 is along the length direction movement continuously of described annealing furnace, and a plurality of carrying roller 9 forms the roller-way that can transport workpiece continuously;
2, charging platform 1: mainly built by material platform skeleton, this charging platform 1 is divided into two sections, and controls automatically with frequency transformer respectively;
3, cup 2: fire door and choke curtain are housed in the cup ingress drop to the consumption of radiations heat energy and gas minimum, the shell of cup 2 adopts shaped steel and steel plate seal welding structure, lagging material adopts light-weight insulating brick and alumina silica refractory, the alumina silica refractory hardboard adopts import Japan Aesop Lay special product product, and insulating brick adopts Yixing high-quality insulating brick;
4, heating chamber 3: described heating chamber 3 is divided into 4 districts of separating mutually, between the body of heater in described each district internal gas flow flow deflector 33 and choke curtain 34 are set, in the body of heater in each district, be respectively arranged with an internal recycle blower fan 31, make and form an independently airflow circulation between each body of heater of distinguishing and flow deflector 33 and the choke curtain 34; Wherein, the upper and lower both sides of roller-way are evenly distributed with a plurality of heating units 32, described internal recycle blower fan 31 is positioned at the top of heating chamber 3, the blast inlet 311 of described internal recycle blower fan 31 and air outlet 312 all are positioned at the body of heater of heating chamber 3, and described blast inlet 311 is perpendicular to plane, roller-way place, described air outlet 312 parallel with planes, roller-way place; In addition, in described heating chamber 3, also be placed with equably between described heating unit 32 and the body of heater and be parallel to roller-way place planar shielding gas spray tube 35, and evenly offer a plurality of jet holes 351 on the described spray tube 35, parallel and the plane, roller-way place of the medullary ray of described jet hole 351, thus guarantee when nitrogen hydrogen mixeding gas outwards sprays by this jet hole 351 more even;
The housing of heating chamber 3 adopts mild steel plate to be welded, and can guarantee preferable resistance to air loss, and the two ends of heating unit 32 and carrying roller 9 are respectively arranged with the sealing cover sealing;
The heat insulation employing of body of heater Yixing high quality refractory brick and the special silicate fiber hardboard of import Japan Aesop Lay+aluminosilicate refractory fiber felt separate type furnace roof module are lined with the aluminum silicate fiber of 230mm, and can guarantee good anti-adjustment gas circulation impact capacity through the protection of special arrangement and steel alloy protection batten, furnace wall and furnace bottom adopt common firebrick structure;
With the subregion of heating chamber 3 accordingly, heating unit 32 is divided into four control areas, and each warm area is all independent by the PID temperature regulator, control automatically, and possesses overtemperature temperature controlled function, when temperature surpasses the safety value of setting, can cut off heating power supply automatically;
The furnace roof of heating chamber 3 is made up of several dismountable plates, and these furnace roof plates are provided with suspension ring, and the convenient for maintaining maintenance personnel of being convenient to sling enters body of heater;
5, chamber 4, first back: the exit that is positioned at body of heater heating chamber 3, be mainly used in the heat exchange between blocking-up heating chamber 4 and the water cooling chamber 5, can make the temperature of heating chamber 3 back zones be subjected to the influence of cooled region to reach minimum like this, this cell structure compactness, the choke curtain of glass fibre is housed, effectively prevents the thermal radiation of heating chamber 3;
6, the water cooling chamber 5: be airtight double-deck water-cooling structure, and 6 the handicapping gas curtains in strong cold house, adopting the static pressure cooling, the material temperature is in the condition of high temperature, and heat exchange is abundant, and room pressure is stable, can effectively reduce the interference of heating chamber 3 and strong cold house 6;
7, strong cold house 6: be provided with outer circulation blower fan 61 in the described strong cold house 6, also be provided with heat exchanger 63 and dividing plate 62 in the strong cold house 6, described dividing plate 62 is positioned at the middle part of strong cold house 6 bodies of heater, described roller-way is between described heat exchanger 63 and dividing plate 62, the top and the bottom of described strong cold house 6 bodies of heater offer upper shed 65 and lower opening 66 respectively, the blast inlet 611 of described outer circulation blower fan 61 is connected with described upper shed 65, the air outlet 612 of described outer circulation blower fan 61 links to each other with described lower opening 66 by the pipe connecting 613 that is arranged on outside the strong cold house 6, be evenly distributed with a plurality of nozzles 621 on the described dividing plate 62, the upper and lower of described strong cold house 6 bodies of heater is only by the gas connection mutually of described a plurality of nozzles 621, cryogenic shielding gas after heat exchange like this, by high efficiency nozzle 621, form almost 100% high speed convection at workpiece surface, reach the ideal cooling performance, can make the annealing goods finish cooling at short notice, reach the purpose of clean annealing;
8, second posterior cell 7: be the double-layer seal water-cooling structure, discharge port is established movable choke curtain, and this section adopts mild steel plate to make, and added necessary stiffening web to obtain rigidity preferably;
9, discharge pedestal 8: at the discharge end of equipment, the design of this material platform is identical with charging platform 1, and is equipped with lifting device, realizes self-emptying;
Described annealing furnace also comprises:
The atmosphere Controlling System is used to control the pressure of shielding gas, and protection gas adopts the mixed gas of nitrogen and hydrogen, the content of hydrogen about 2 ~ 30%;
Cooling water pipeline, body of heater water coolant adopt the open fire discharging, and whether operator can estimate water coolant at any time normal, avoids accidents caused:
Warning howler, corresponding with the temperature regulator that above-mentioned heating chamber 3 each subregion are provided with, to report to the police in each subregion temperature superelevation or when unusual respectively, overtemperature alarm is realized by temp controlled meter, when temperature surpasses the safety value of setting, will cut off heating power supply automatically.
Before heating up, start prepares: keep all water coolants unimpeded, start internal recycle blower fan 31 and outer circulation blower fan 61 and make its running, start carrying roller 9 runnings in the stove, by the heating schedule design temperature and begin to heat up.
When furnace temperature reached requirement, the atmosphere Controlling System began to charge into protective atmosphere-nitrogen and hydrogen mixture in stove, and wherein, the content of hydrogen is about 2 ~ 30%, and remained little positive air pressure in the stove.
In addition; for guaranteeing the stopping property of body of heater; improve the thermal treatment quality and the furnace thermal efficiency of workpiece; described internal recycle blower fan 31 and outer circulation blower fan 61 all have the sleeve sealing structure; it mainly comprises: rotating shaft 614; be used to pedestal 615 that this rotating shaft 614 is therefrom passed; be installed in two sealing-rings 610 of the top and bottom of this pedestal 615; described pedestal 615 is installed on the body of heater of heating chamber 3 or strong cold house 6; described pedestal 615 is provided with recess 619 with rotating shaft 614 contacted faces; described recess 619; form the sealing gland chamber 616 of twisted rotary shaft between sealing-ring 610 and the rotating shaft 614; also being provided with on the described pedestal 615 is used to circulate protects the passage 618 of gas; one end of this passage 618 and the gas connection mutually of the source of the gas of shielding gas, the other end and described sealing gland chamber 616 gas mutually are communicated with.
Blower fan is when work; at first in passage 618, feed pressure more than or equal to stove in the protection gas of protection atmospheric pressure; because the air pressure of stove inside is less than the air pressure in the sealing gland chamber 616; the protection gas of stove inside just can not flow to outside the stove along the gap between above-mentioned pedestal 615 and the rotating shaft 614; extraneous air can be in this gap flow to stove yet, has only protection gas in the sealing gland chamber 616 of minute quantity this moment to the stove external leakage.By consuming the protection gas of trace, realized the high reliability of blower fan axle head dynamic seal, thereby guaranteed thermal treatment quality, the reduction thermal losses of workpiece.
The working process and the annealing process of above-mentioned low furnace pressure strong convection continuous roller bottom type annealing furnace:
Workpiece enters charging platform 1, by the roller-way transmission system it is sent into cup 2 and carries out preheating and maintenance; Then, workpiece enters heating chamber 3 heating by cup 2, insulation? hour, because the inlet mouth 311 of internal recycle blower fan 31 faces plane, carrying roller 9 place, and air outlet 312 is positioned at the body of heater top, and air outlet 312 is to body of heater both sides blowing gas, shielding gas is fully circulated, shielding gas spray tube 35 evenly is arranged in the body of heater, spray tube 35 is parallel to the roller-way injecting protective gas, and shielding gas is fully heated, and heats is better, be positioned at all abundant contact protection gas of body of heater workpiece everywhere simultaneously, make the workpiece light behind the return of goods;
Workpiece enters chamber 4, first back successively after heating chamber 3 is sent, water cooling chamber's 5 coolings, enter strong cold house 6 afterwards, in strong cold house 6, because dividing plate 62 separates the upper and lower of body of heater, can well improve heat exchanger effectiveness, the air outlet 612 of part gas by outer circulation blower fan 61 entered by lower opening 66 places of body of heater, enter the upper of furnace body space by the nozzle on the dividing plate 62 621, gas can be taken away the heat on the workpiece, and because the effect of heat exchanger 63, when air-flow heat behind over-heat-exchanger 63 of heat is taken away by the circulating cooling liquid in the heat exchanger 63, the air-flow that flows to recirculation blower 61 from the upper shed 65 at the top of body of heater is a low-temperature airflow, above-mentioned low-temperature airflow further dispels the heat through the outer pipe connecting 613 of body of heater again, is entered the lower opening 66 of body of heater at last by air outlet 612, and cooling circulates.Cryogenic shielding gas after heat exchange by high efficiency nozzle 621, forms almost 100% high speed convection at workpiece surface like this; reach the ideal cooling performance; can make the annealing goods finish cooling at short notice, reach the purpose of clean annealing, and improve the cold drawn performance of workpiece.Last workpiece enters second posterior cell 7 and further cools off, and through discharge pedestal 8 automatic dischargings.
Claims (9)
1. one kind low furnace pressure strong convection continuous roller bottom type annealing furnace, comprise the charging platform that sets gradually, heating chamber, strong cold house and the roller-way transmission system that runs through described annealing furnace, in the described heating chamber, on the roller-way, following both sides are evenly distributed with a plurality of heating units, it is characterized in that: be provided with the internal recycle blower fan in the described heating chamber, be provided with the outer circulation blower fan in the described strong cold house, in described heating chamber: the blast inlet of described internal recycle blower fan and air outlet all are positioned at the heating chamber body of heater, and described blast inlet is perpendicular to plane, roller-way place, and described air outlet is parallel to plane, roller-way place; In described strong cold house, be provided with heat exchanger and dividing plate, described dividing plate is positioned at the middle part of strong cold house body of heater, described roller-way is between described heat exchanger and dividing plate, the top and the bottom of described strong cold house body of heater offer upper shed and lower opening respectively, the blast inlet of described outer circulation blower fan is connected with described upper shed, the air outlet of described outer circulation blower fan links to each other with described lower opening by the pipe connecting that is arranged on outside the strong cold house, be evenly distributed with a plurality of nozzles on the described dividing plate, the upper and lower of described strong cold house body of heater is only by the gas connection mutually of described a plurality of nozzles.
2. low furnace pressure strong convection continuous roller bottom type annealing furnace according to claim 1, its feature also is: described annealing furnace also includes the cup between described charging platform and described heating chamber, first chamber, back and the water cooling chamber between described heating chamber and described strong cold house, be positioned at the second posterior cell and the discharge pedestal of described strong cold house rear side, described cup, heating chamber, chamber, first back, the water cooling chamber, be provided with the choke curtain between the body of heater of strong cold house and second posterior cell, the ingress of described cup and the exit of second posterior cell also are provided with the choke curtain.
3. low furnace pressure strong convection continuous roller bottom type annealing furnace according to claim 2, its feature also is: described heating chamber is divided into the district of a plurality of mutual separations, between the body of heater in described each district internal gas flow flow deflector and choke curtain are set, be provided with the internal recycle blower fan in the body of heater in described each district, form independently airflow circulation in the body of heater in described each district.
4. according to claim 1 or 2 or 3 described low furnace pressure strong convection continuous roller bottom type annealing furnaces; its feature also is: in described heating chamber; also be placed with equably between described heating unit and the body of heater and be parallel to roller-way place planar shielding gas spray tube; and evenly offer a plurality of jet holes on the described spray tube, the medullary ray of described jet hole is parallel to plane, roller-way place.
5. low furnace pressure strong convection continuous roller bottom type annealing furnace according to claim 1; its feature also is: described internal recycle blower fan and outer circulation blower fan all have: rotating shaft; be used to pedestal that this rotating shaft is therefrom passed; be installed in two sealing-rings of the top and bottom of this pedestal; described pedestal is provided with recess with the contacted face of rotating shaft; described recess; form the sealing gland chamber of twisted rotary shaft between sealing-ring and the rotating shaft; also being provided with on the described pedestal is used to circulate protects the passage of gas; one end of this passage and the gas connection mutually of the source of the gas of shielding gas, the other end and described sealing gland chamber gas mutually are communicated with.
6. one kind low furnace pressure strong convection continuous annealing process, it mainly is in order workpiece to be sent into successively cup to carry out preheating, send into heating chamber heating and insulation setting-up time, at last workpiece being sent into cooled region cools off, it is characterized in that: be provided with the internal recycle blower fan in the described heating chamber, be provided with the outer circulation blower fan in the described strong cold house, in described heating chamber: the blast inlet of described internal recycle blower fan and air outlet all are positioned at the heating chamber body of heater, and described blast inlet is perpendicular to plane, roller-way place, and described air outlet is parallel to plane, roller-way place; In described strong cold house, be provided with heat exchanger and dividing plate, described dividing plate is positioned at the middle part of strong cold house body of heater, described roller-way is between described heat exchanger and dividing plate, the top and the bottom of described strong cold house body of heater offer upper shed and lower opening respectively, the blast inlet of described outer circulation blower fan is connected with described upper shed, the air outlet of described outer circulation blower fan links to each other with described lower opening by the pipe connecting that is arranged on outside the strong cold house, be evenly distributed with a plurality of nozzles on the described dividing plate, the upper and lower of described strong cold house body of heater is only by the gas connection mutually of described a plurality of nozzles.
7. low furnace pressure strong convection continuous annealing process according to claim 6; its feature also is: in described heating chamber; also be placed with between described heating unit and the body of heater and be parallel to roller-way place planar shielding gas spray tube; and evenly offer a plurality of jet holes on the described spray tube; the medullary ray of described jet hole is parallel to plane, roller-way place, and shielding gas is evenly jetted to workpiece at the upper and lower both direction of workpiece.
8. low furnace pressure strong convection continuous annealing process according to claim 6, its feature also is: described heating chamber is divided into the district of a plurality of mutual separations, the independent airflow circulation of each self-forming of body of heater in described each district.
9. low furnace pressure strong convection continuous annealing process according to claim 6, its feature also is: described annealing process adopts nitrogen and hydrogen mixture as shielding gas.
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| CN101571355B (en) * | 2009-06-01 | 2011-01-05 | 苏州中门子科技有限公司 | Strong loop quick cooling chamber |
| CN102094114B (en) * | 2009-12-09 | 2013-01-16 | 山东正昌煤矿机械有限公司 | Energy-saving gas conditioning furnace and thermal processing method for hot rolling of seamless steel pipes |
| CN101831536A (en) * | 2010-05-28 | 2010-09-15 | 苏州工业园区胜龙电炉制造有限公司 | Isothermal annealing energy-saving furnace and isothermal annealing method thereof |
| CN101824518A (en) * | 2010-06-01 | 2010-09-08 | 苏州工业园区胜龙电炉制造有限公司 | Roll-bar type isothermal annealing energy-saving furnace |
| CN101899633B (en) * | 2010-07-31 | 2011-10-05 | 桂林漓佳金属有限责任公司 | Automatic loading device for nonferrous metal tube annealing furnace |
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| KR101253703B1 (en) * | 2012-10-26 | 2013-04-12 | 주식회사 에스에이씨 | Batch type annealing thermal processing equipment |
| CN103911502A (en) * | 2014-04-21 | 2014-07-09 | 苏州乔家炉业有限公司 | Continuous roller-hearth type furnace |
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