CN113564336A - Annealing furnace and annealing process of martensitic stainless steel 2Cr13 wire - Google Patents
Annealing furnace and annealing process of martensitic stainless steel 2Cr13 wire Download PDFInfo
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- CN113564336A CN113564336A CN202110744659.8A CN202110744659A CN113564336A CN 113564336 A CN113564336 A CN 113564336A CN 202110744659 A CN202110744659 A CN 202110744659A CN 113564336 A CN113564336 A CN 113564336A
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- 238000000137 annealing Methods 0.000 title claims abstract description 120
- 229910001105 martensitic stainless steel Inorganic materials 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 title claims abstract description 19
- 230000008569 process Effects 0.000 title claims abstract description 19
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 87
- 238000010438 heat treatment Methods 0.000 claims abstract description 67
- 238000001816 cooling Methods 0.000 claims abstract description 61
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 40
- 239000000463 material Substances 0.000 claims abstract description 30
- 239000000919 ceramic Substances 0.000 claims description 41
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 35
- 239000004744 fabric Substances 0.000 claims description 27
- 238000005086 pumping Methods 0.000 claims description 16
- 229910001220 stainless steel Inorganic materials 0.000 claims description 2
- 229910000734 martensite Inorganic materials 0.000 claims 1
- 239000010935 stainless steel Substances 0.000 claims 1
- 125000004122 cyclic group Chemical group 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 abstract 1
- 238000005192 partition Methods 0.000 description 10
- 229910001873 dinitrogen Inorganic materials 0.000 description 7
- 230000009471 action Effects 0.000 description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 230000005484 gravity Effects 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
- 238000003825 pressing Methods 0.000 description 3
- 238000010791 quenching Methods 0.000 description 3
- 230000000171 quenching effect Effects 0.000 description 3
- 238000005496 tempering Methods 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
- 230000032258 transport Effects 0.000 description 1
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/54—Furnaces for treating strips or wire
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B1/00—Cleaning by methods involving the use of tools
- B08B1/10—Cleaning by methods involving the use of tools characterised by the type of cleaning tool
- B08B1/12—Brushes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B1/00—Cleaning by methods involving the use of tools
- B08B1/20—Cleaning of moving articles, e.g. of moving webs or of objects on a conveyor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B1/00—Cleaning by methods involving the use of tools
- B08B1/50—Cleaning by methods involving the use of tools involving cleaning of the cleaning members
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/34—Methods of heating
- C21D1/42—Induction heating
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0006—Details, accessories not peculiar to any of the following furnaces
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0006—Details, accessories not peculiar to any of the following furnaces
- C21D9/0018—Details, accessories not peculiar to any of the following furnaces for charging, discharging or manipulation of charge
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0062—Heat-treating apparatus with a cooling or quenching zone
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Abstract
The invention belongs to the technical field of annealing equipment, and particularly relates to an annealing furnace and an annealing process for a martensitic stainless steel 2Cr13 wire: the improved annealing box comprises a box body, furnace gate and back furnace gate before box both ends respectively fixed mounting, fixed mounting has the baffle in the box, the material hole has been seted up on the baffle, the baffle is divided into two cavity interval annealing rooms and cooling chamber in with the box, fixed surface installs air inlet pipeline and circulation pipeline on the box, fixed mounting has the pump drainage air pump on the circulation pipeline, install a plurality of infrared heating ring in the annealing chamber, set up recess one in the preceding furnace gate, fixed mounting has spring one in the recess, spring one end fixedly connected with furnace gate baffle. According to the structure, through the arrangement of the furnace door baffle, gaps formed among the furnace door, the box body and wires can be reduced, heat loss is reduced, meanwhile, the cyclic recycle of nitrogen can be realized, and the production cost is reduced.
Description
Technical Field
The invention belongs to the technical field of annealing equipment, and particularly relates to an annealing furnace and an annealing process for a martensitic stainless steel 2Cr13 wire.
Background
The heat treatment furnace is divided into an annealing furnace, a quenching furnace, a tempering furnace, a normalizing furnace and a quenching and tempering furnace, and is mainly used for annealing large carbon steel and alloy steel parts; tempering the surface quenching part; and (4) performing heat treatment processes such as stress relief annealing and aging on the weldment. The heating mode comprises electric heating, fuel oil, fuel gas, coal and hot air circulation. The annealing furnace is a novel heat exchange device. The annealing furnace is an energy-saving periodic operation furnace, has a super energy-saving structure, adopts a fiber structure and saves electricity by 60 percent.
Some technical solutions related to an annealing furnace also exist in the prior art, for example, chinese patent with application number CN201821451661.6 discloses a continuous annealing device for stainless steel wire, which includes an annealing furnace, a heating assembly, an output assembly and a cooling system; this technical scheme carries out short time high temperature heating to the wire rod that gets into the annealing stove through utilizing high frequency infrared induction heating appearance, and in the transportation in annealing stove thereafter, the heat on the wire rod is taken away to the nitrogen gas of input, transports heating element one end, and the wire rod to high temperature transportation when improving heating efficiency cools down, forms annealing effect, and the possibility of wire rod oxidation has been stopped to the annealing stove that is full of inert gas in addition, improves annealing efficiency and quality. However, in the technical scheme, the opening height of the furnace door is fixed when the wire enters the furnace door during annealing, so that the heat loss is high, nitrogen is needed for absorbing heat by using nitrogen, the heat recovery is incomplete, and the resource waste is large.
Disclosure of Invention
In order to make up for the defects of the prior art and solve the problems that the opening height of a furnace door is fixed when a wire enters the furnace door during annealing, so that the heat loss is high, nitrogen is needed to absorb heat by utilizing the nitrogen, the heat recovery is incomplete and the resource waste is large, the invention provides the annealing furnace and the annealing process of the martensitic stainless steel 2Cr13 wire.
The technical scheme adopted by the invention for solving the technical problems is as follows: the invention relates to an annealing furnace and an annealing process for martensitic stainless steel 2Cr13 wire, which comprises a box body, wherein the box body is hollow, a front furnace door and a rear furnace door are respectively and fixedly arranged at two ends of the box body, a partition plate is fixedly arranged in the box body and positioned at one side close to the rear furnace door, a material hole is formed in the partition plate, the box body is divided into two hollow annealing chambers and a cooling chamber by the partition plate, an air inlet pipeline and a circulating pipeline are fixedly arranged on the upper surface of the box body, the lower end of the air inlet pipeline extends into the cooling chamber, one end of the circulating pipeline extends into the cooling chamber, the other end of the circulating pipeline extends into the annealing chamber, a pumping and exhausting pump is fixedly arranged on the circulating pipeline, the pumping and exhausting pump is fixedly arranged on the upper surface of the box body, a plurality of infrared heating rings are arranged in the annealing chamber, and the infrared heating rings are fixedly arranged on the side wall of the annealing chamber through supporting columns, a plurality of infrared heating ring are along length direction evenly distributed, infrared heating ring's central line and the coincidence of the central line in material hole, set up recess one in the forehearth door, fixed mounting has spring one in the recess, spring one is located the lower surface of recess one, spring one is along width direction evenly distributed in recess one, spring one lower extreme fixedly connected with furnace gate baffle, the furnace gate baffle is total a plurality ofly, and the furnace gate baffle is along width direction evenly distributed in recess one, terminal surface and the inside lower surface of box contact under the furnace gate baffle.
When the furnace door baffle plate is in work, a certain number of furnace door baffle plates are upwards opened according to the diameter of the wire rod, the furnace door baffle plates are positioned in a first groove in a front furnace door, a T-shaped groove and a T-shaped sliding block are respectively arranged between two adjacent furnace door baffle plates, the upper ends of the furnace door baffle plates are fixedly connected with a first spring, and the first spring is fixedly connected in the first groove, so that when the furnace door baffle plates are upwards opened, the furnace door baffle plates upwards compress the springs under the upward acting force, the first springs are in a pressing state, the furnace door baffle plates upwards slide in the T-shaped grooves, the wire rod is placed into an annealing furnace from the front furnace door, the upward acting force on the furnace door baffle plates is removed, at the moment, the first springs restore to the natural state and generate downward elastic force on the furnace door baffle plates, and under the gravity action of the furnace door baffle plates and the elastic force of the springs on the furnace door baffle plates, the furnace door baffle plates downwards slide to the upper parts of the wire rod, at the moment, only the furnace door baffle above the wire is in an open state and a gap exists between the furnace door baffle and the inner surface of the box body, and other furnace door baffles are all in a closed state, so that the gap formed among the furnace door baffle, the wire and the inner surface of the box body is reduced, and the heat loss is reduced; at the moment, industrial nitrogen is conveyed into the cooling chamber through the air inlet pipeline, the pumping and exhausting air pump conveys the industrial nitrogen into the annealing chamber through the circulating pipeline, when the industrial nitrogen is completely filled in the annealing furnace, the power supply is started, the infrared heating ring starts to heat and heat, the industrial nitrogen in the annealing chamber protects the wire at the moment, the wire is prevented from being oxidized when contacting with oxygen in the high-temperature heating process, after the heating is finished, the wire enters the cooling chamber through the material hole, the industrial nitrogen in the cooling chamber cools the wire at the moment, the wire is protected at the same time, the high-temperature wire is prevented from being oxidized when contacting with oxygen in the cooling chamber, the pumping and exhausting air pump pumps the heated industrial nitrogen in the cooling chamber through the circulating pipeline to the front end of the annealing chamber, the unheated wire can be preheated to a certain degree, the pumping and exhausting air pump pumps the heated industrial nitrogen out of the annealing chamber through the circulating pipeline after the preheating of the wire is finished, the heated industrial nitrogen is filtered and cooled continuously through the circulating pipeline And conveying the air inlet pipeline into a cooling chamber to cool the wire rod, taking the cooled wire rod out of the rear furnace door after cooling, and repeating the steps.
Preferably, a second groove is formed in the lower end of the furnace door baffle in the width direction, a rotating shaft is fixedly mounted in the second groove, and a roller is rotatably mounted on the rotating shaft.
During operation, upwards open the furnace gate baffle in the preceding furnace gate internal groove one, put into the wire rod that needs to carry out annealing operation, later close the furnace gate baffle downwards, the roller that is located furnace gate baffle lower extreme recess two this moment and the wire rod direct contact that needs to carry out annealing operation, the roller is after with wire rod direct contact, the roller takes place to rotate in the axis of rotation, direct and wire rod contact takes place to scrape colored wire rod surface when having avoided the furnace gate baffle to close downwards, also can make the impact force step-down that the wire rod received when the furnace gate baffle closes downwards through the rotation of roller simultaneously, take place to shake in order to avoid the wire rod to directly receive the impact of furnace gate baffle when the furnace gate baffle closes downwards.
Preferably, the roller is a cylinder with an inward-concave middle area, the outer surface of the roller is fixedly provided with a high-temperature-resistant fireproof cloth, one end of the high-temperature-resistant fireproof cloth is fixedly connected with the roller, the other end of the high-temperature-resistant fireproof cloth is fixedly connected with a second spring, and the second spring is fixedly arranged at the other end of the roller.
When the furnace door is in work, after a wire rod needing annealing treatment is placed into the annealing furnace, the furnace door baffle is closed, the roller on the furnace door baffle is in direct contact with the wire rod at the moment, the shape of the roller is the shape shown in the attached drawing 6 of the specification, the high-temperature-resistant fireproof cloth is installed on the outer surface of the roller, meanwhile, the two ends of the high-temperature-resistant fireproof cloth are fixedly connected to one end of the roller and the second spring respectively, and the high-temperature-resistant fireproof cloth is always in a tensioning state The gap formed between the rear part and the inner surface of the box body further reduces the gap and reduces the heat loss.
Preferably, the infrared heating ring interpolation has high temperature resistant transparent ceramic pipe, high temperature resistant transparent ceramic pipe passes through support column one and fixes the both sides at annealing room, the reflection wall is good at high temperature resistant transparent ceramic pipe both ends, the reflection wall is installed in the high temperature resistant transparent ceramic pipe outside, through two fixed mounting of support column between reflection wall and the high temperature resistant transparent ceramic pipe, infrared heating ring is located between reflection wall and the high temperature resistant transparent ceramic pipe, contactless between high temperature resistant transparent ceramic pipe both ends and furnace gate baffle and the baffle.
When the annealing furnace works, wires needing annealing treatment enter the high-temperature resistant transparent ceramic tube after entering the annealing chamber through the front furnace door, the reflecting wall is fixedly arranged outside the high-temperature resistant transparent ceramic tube, the infrared heating ring is positioned between the reflecting wall and the high-temperature resistant transparent ceramic tube, the power supply is turned on at the moment, the infrared heating ring starts to heat, the reflecting wall can reflect part of the emitted heat back to the high-temperature resistant transparent ceramic tube, the heating rate in the heating process is further improved, the heat loss and the heating energy consumption in the heating process are also reduced, meanwhile, the wires are too long in length in the annealing process, the wires can shake under the influence of the tension, the shaking range of the wires is limited due to the fact that the wires are heated in the high-temperature resistant transparent ceramic tube, and therefore the damage of the infrared heating ring caused by the fact that the wires shake collides with the infrared heating ring in the heating process is avoided, affecting the normal use of the annealing furnace.
Preferably, fixed mounting has the heat pipe on the baffle, the heat pipe is located the cooling chamber, align each other between heat pipe and the transparent ceramic pipe of high temperature resistant, the heat pipe is the same with the transparent ceramic pipe aperture of high temperature resistant, fixed mounting has soft copper wire brush in the heat pipe, soft copper wire brush is along heat pipe length direction interval distribution, the inlet port has been seted up on the heat pipe, the lower extreme and the inlet port fixed connection of air inlet pipeline.
The during operation, the wire rod that the heating was accomplished passes through in the material hole gets into the cooling chamber, the wire rod gets into in the heat conduction pipe with material hole fixed connection this moment, industry nitrogen gas passes through the air inlet pipeline and lets in the cooling chamber this moment, because air inlet fixed connection on the lower extreme of air inlet pipeline and the heat pipe, therefore, industry nitrogen gas directly lets in the heat conduction pipe, cool down the wire rod, simultaneously when the wire rod is when passing the heat pipe, fixed mounting's soft copper wire brush and high temperature wire rod direct contact in the heat conduction pipe, clear away remaining miscellaneous bits on the wire rod surface, simultaneously because the good heat conductivity of copper, make the heat on the soft copper wire brush can absorb some wire rods after contacting the wire rod, give off the heat to the industry nitrogen gas that lets in the heat conduction pipe through the bigger soft copper wire brush of relative surface area and heat conduction pipe, and then improve the cooling efficiency of wire rod.
Preferably, the heat conduction pipe is provided with material falling holes, the material falling holes are located at intervals of the soft copper wire brushes, and the air inlet holes are inclined holes with inclined angles.
When the wire rod cooling device works, the heated wire rod enters the cooling chamber to be cooled, the wire rod enters the heat conduction pipe fixedly connected with the material hole, the soft copper wire brush in the heat conduction pipe removes sundries on the surface of the wire rod, meanwhile, the removed sundries drop out of the heat conduction pipe through the material dropping hole, so that the sundries are prevented from accumulating in the heat conduction pipe to influence the normal work of the heat conduction pipe, meanwhile, the air inlet hole is an inclined hole with a certain inclination angle, when industrial nitrogen is introduced into the heat conduction pipe through an air inlet pipeline fixedly connected with the air inlet hole, the industrial nitrogen can blow through the soft copper wire brush, thereby leading the sundries remained on the soft copper wire brush to fall off, further falling the heat conduction pipe from the material falling hole, avoiding influencing the normal work of the heat conduction pipe, meanwhile, the soft copper wire brush is cooled to a certain extent, so that the soft copper wire brush can continuously absorb heat of the wire, and cooling efficiency of the wire is improved.
An annealing process of martensitic stainless steel 2Cr13 wire, which is suitable for the annealing furnace of martensitic stainless steel 2Cr13 wire, and comprises the following steps:
s1, opening a furnace door baffle at the front furnace door, putting the wire into an annealing furnace, and descending the furnace door baffle downwards to reduce the gap between the front furnace door and the inner surface of the box body;
s2, introducing industrial nitrogen into the annealing furnace from the air inlet pipeline;
s3, turning on a power supply to enable the infrared heating ring to start heating, increasing the temperature in the annealing chamber, and enabling the wire to be conveyed into the cooling chamber through the material holes after the wire is annealed in the annealing chamber (11);
s4, introducing industrial nitrogen into the cooling chamber from the air inlet pipeline to cool the high-temperature wire rods, and pumping the heated industrial nitrogen in the cooling chamber to the front end of the annealing chamber by the pumping and exhausting air pump through the circulating pipeline to preheat;
and S5, taking out the annealed wire from the rear furnace door.
The invention has the following beneficial effects:
1. the annealing furnace of the martensitic stainless steel 2Cr13 wire rod is provided with the furnace door, the furnace door baffles, the first spring, the roller and the high-temperature-resistant fireproof cloth, the minimum opening height of the furnace door baffles is adjusted along with the diameter of the wire rod by vertically sliding between the single furnace door baffles through the T-shaped groove on one adjacent side between the furnace door baffles and the T-shaped slide block, so that the gap formed between the furnace door and the inner surface of a box body is reduced, excessive heat loss is avoided, meanwhile, the roller is firstly contacted with the wire rod and rotates with the wire rod when the furnace door baffles are closed, the surface of the wire rod is further prevented from being damaged by the furnace door baffles, the high-temperature-resistant fireproof cloth is matched with the special shape of the roller on the outer surface of the roller, the wire rod can continuously recess towards the inner side of the roller after contacting the high-temperature-resistant fireproof cloth, and the gap of the furnace door baffles is smaller when the furnace door baffles are closed, reducing the heat loss.
2. According to the annealing furnace for the martensitic stainless steel 2Cr13 wire, the exhaust pump and the circulating pipeline are arranged, so that heated industrial nitrogen gas remained in the cooling chamber after cooling can be conveyed to the front end of the annealing chamber from the cooling chamber under the action of the exhaust pump, the effect of preheating the wire is achieved, the heating rate of the wire is improved, meanwhile, the heating efficiency of the infrared heating ring can be improved due to the arrangement of the high-temperature-resistant transparent ceramic pipe and the reflecting wall, the heat loss of the infrared heating ring during heating is reduced, and the energy consumption is reduced.
3. According to the annealing furnace for the martensitic stainless steel 2Cr13 wire, the heat pipe, the soft copper wire brush, the air inlet hole and the dropping hole are arranged, the heat in the high-temperature wire is absorbed through the good heat conductivity of the soft copper wire brush, so that the cooling rate of the wire is improved, meanwhile, the soft copper wire brush is directly contacted with the wire, so that sundries generated in the annealing process of the wire are removed, and the air inlet hole and the dropping hole with a certain inclination angle are arranged, so that the residual wire sundries in the soft copper wire brush can be blown off by industrial nitrogen, and the heat pipe is dropped out of the dropping hole.
Drawings
The invention will be further explained with reference to the drawings.
FIG. 1 is a schematic view of the structure of an annealing furnace of the present invention;
FIG. 2 is an enlarged view of a portion of FIG. 1 at A;
FIG. 3 is an enlarged view of a portion of FIG. 1 at B;
FIG. 4 is an enlarged view of a portion of FIG. 1 at C;
fig. 5 is a process flow diagram of an annealing process of the wire rod of the present invention;
FIG. 6 is a schematic view of the structure of the roller;
FIG. 7 is an enlarged view of a portion of FIG. 1 at D;
in the figure: the device comprises a box body 1, an annealing chamber 11, a cooling chamber 12, a front furnace door 2, a first spring 21, a first groove 22, a furnace door baffle 3, high-temperature-resistant fireproof cloth 31, a roller 32, a second spring 33, a T-shaped groove 34, a rotating shaft 35, a second groove 36, an air inlet pipeline 41, an air pumping and exhausting pump 42, a circulating pipeline 43, a rear furnace door 5, a heat conducting pipe 6, a soft copper wire brush 61, an air inlet hole 62, a material dropping hole 63, a partition plate 7, a material hole 71, an infrared heating pipe 8, a reflecting wall 9 and a high-temperature-resistant transparent ceramic pipe 10.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
As shown in fig. 1 to 7, the annealing furnace for martensitic stainless steel 2Cr13 wire according to the present invention includes a hollow box body 1, a front furnace door 2 and a rear furnace door 5 are respectively and fixedly installed at two ends of the box body 1, a partition plate 7 is fixedly installed in the box body 1, the partition plate 7 is located at a side close to the rear furnace door 5, a material hole 71 is formed in the partition plate 7, the partition plate 7 divides the interior of the box body 1 into two hollow-region annealing chambers 11 and a cooling chamber 12, an air inlet pipeline 41 and a circulation pipeline 43 are fixedly installed on the upper surface of the box body 1, the lower end of the air inlet pipeline 41 extends into the cooling chamber 12, one end of the circulation pipeline 43 extends into the cooling chamber 12, the other end of the circulation pipeline extends into the annealing chamber 11, an exhaust pump 42 is fixedly installed on the circulation pipeline 43, the exhaust pump 42 is fixedly installed on the upper surface of the box body 1, a plurality of infrared heating rings 8 are installed in the annealing chamber 11, infrared heating ring 8 passes through pillar fixed mounting at 11 lateral walls of annealing room, a plurality of infrared heating ring 8 are along length direction evenly distributed, infrared heating ring 8's central line and the coincidence of the central line in material hole 71, recess 22 has been seted up in preceding furnace gate 2, fixed mounting has spring 21 in recess 22, spring 21 is located the lower surface of recess 22, width direction evenly distributed is followed to spring 21 in recess 22, spring 21 lower extreme fixedly connected with furnace gate baffle 3, furnace gate baffle 3 is total a plurality ofly, and furnace gate baffle 3 contacts along width direction evenly distributed in recess 22, furnace gate baffle 3 lower extreme contacts with 1 inside lower surface of box.
When the annealing furnace works, a certain number of furnace door baffles 3 are upwards opened according to the diameter of a wire rod, because the furnace door baffles 3 are positioned in a first groove 22 in a front furnace door 2, a T-shaped groove 34 and a T-shaped sliding block are respectively arranged between two adjacent furnace door baffles 3, the upper ends of the furnace door baffles 3 are fixedly connected with a first spring 21, and the first spring 21 is fixedly connected in the first groove 22, when the furnace door baffles 3 are upwards opened, the furnace door baffles 3 upwards compress the first spring 21 under the upward acting force, at the moment, the first spring 21 is in a pressing state, the furnace door baffles 3 upwards slide in the T-shaped groove 34, at the moment, the wire rod is put into the annealing furnace from the front furnace door 2, then the upward acting force on the furnace door baffles 3 is removed, at the moment, the first spring 21 restores to a natural state to generate downward elastic force on the furnace door baffles 3, and under the gravity action of the furnace door baffles 3 and the elastic force of the first spring 21 on the furnace door baffles 3, the furnace door baffle 3 slides downwards to the position above the wire rods, only the furnace door baffle 3 above the wire rods is in an open state and has a gap with the inner surface of the box body 1 at the moment, and other furnace door baffles 3 are all in a closed state at the moment, so that the gaps formed among the furnace door baffle 3, the wire rods and the inner surface of the box body 1 are reduced, and the heat loss is reduced; at this time, firstly, industrial nitrogen is conveyed into the cooling chamber 12 through the air inlet pipeline 41, the pumping and exhausting air pump 42 conveys the industrial nitrogen into the annealing chamber 11 through the circulating pipeline 43, when the annealing furnace is completely filled with the industrial nitrogen, a power supply is turned on to heat and heat the infrared heating ring 8, at this time, the industrial nitrogen in the annealing chamber 11 protects the wire to prevent the wire from being oxidized when contacting with oxygen in the high-temperature heating process, after the heating is completed, the wire enters the cooling chamber 12 through the material hole 71, at this time, the industrial nitrogen in the cooling chamber 12 cools and cools the wire, and at the same time, the wire is protected to prevent the high-temperature wire from being oxidized when contacting with oxygen in the cooling chamber 12, and simultaneously, the pumping and exhausting air pump 42 pumps the industrial nitrogen heated in the cooling chamber 12 through the circulating pipeline 43 to the front end of the annealing chamber 11 to ensure that the unheated wire can be preheated to a certain extent, after the preheating of the wire rod is completed, the pumping and exhausting air pump 42 pumps the heated industrial nitrogen out of the annealing chamber 11 through the circulating pipeline 43 for filtering and cooling, then the heated industrial nitrogen is conveyed into the cooling chamber 12 through the air inlet pipeline 41 for cooling the wire rod, after the cooling is completed, the wire rod is taken out from the rear furnace door 5 after the cooling is completed, and then the steps are repeated.
According to one embodiment of the present invention, a second groove 36 is formed in the lower end of the furnace door baffle 3 along the width direction, a rotating shaft 35 is fixedly installed in the second groove 36, and the roller 32 is rotatably installed on the rotating shaft 35.
When the furnace door baffle plate device works, the furnace door baffle plate 3 in the first groove 22 in the front furnace door 2 is opened upwards, a wire rod needing annealing operation is placed, then the furnace door baffle plate 3 is closed downwards, at the moment, the roller 32 in the second groove 36 at the lower end of the furnace door baffle plate 3 is in direct contact with the wire rod needing annealing operation, after the roller 32 is in direct contact with the wire rod, the roller 32 rotates on the rotating shaft 35, the phenomenon that the wire rod surface is scratched when the furnace door baffle plate 3 is closed downwards due to direct contact with the wire rod is avoided, meanwhile, the impact force of the wire rod when the furnace door baffle plate 3 is closed downwards is lowered due to the rotation of the roller 32, and the phenomenon that the wire rod is directly impacted by the furnace door baffle plate 3 to shake when the furnace door baffle plate 3 is closed downwards is avoided.
In one embodiment of the present invention, the roller 32 is a cylinder with an inwardly recessed middle region, the high temperature resistant fireproof cloth 31 is fixedly installed on the outer surface of the roller 32, one end of the high temperature resistant fireproof cloth 31 is fixedly connected with the roller 32, the other end of the high temperature resistant fireproof cloth 31 is fixedly connected with the second spring 33, and the second spring 33 is fixedly installed at the other end of the roller 32.
When the furnace door baffle plate is in work, after a wire rod to be annealed is placed into the annealing furnace, the furnace door baffle plate 3 is closed, the roller 32 on the furnace door baffle plate 3 is in direct contact with the wire rod at the moment, because the shape of the roller 32 is the shape shown in the attached drawing 6 of the specification, the high-temperature-resistant fireproof cloth 31 is installed on the outer surface of the roller 32, meanwhile, the high-temperature-resistant fireproof cloth 31 is in a tensioning state because two ends of the high-temperature-resistant fireproof cloth 31 are fixedly connected to one end of the roller 32 and the second spring 33 respectively, and therefore, when the roller 32 is in direct contact with the wire rod, the wire rod is firstly contacted with the high-temperature-resistant fireproof cloth 31, under the gravity of the furnace door baffle plate 3 and the elastic action of the first spring 21 on the furnace door baffle plate 3, the wire rod can continuously extrude the high-temperature-resistant fireproof cloth 31, at the moment, the high-temperature-resistant fireproof cloth 31 in the tensioning state can be sunken towards the middle sunken position of the roller 32 along with the extrusion of the wire rod, so that gaps among the furnace door baffle plate 3, the box body 1, the wire rod and the gaps among the roller 32, the wire rod and the inner surface of the box body 1 are formed by the gaps The formed gap becomes a gap formed between the extruded wire and the high-temperature-resistant fireproof cloth 31 and the inner surface of the box body 1, so that the gap is further reduced, and the heat loss is reduced.
As an embodiment of the present invention, a high temperature resistant transparent ceramic tube 10 is inserted into the infrared heating ring 8, the high temperature resistant transparent ceramic tube 10 is fixed at two sides of the annealing chamber 11 through a first support column, two ends of the high temperature resistant transparent ceramic tube 10 are longer than the reflection wall 9, the reflection wall 9 is installed at the outer side of the high temperature resistant transparent ceramic tube 10, the reflection wall 9 and the high temperature resistant transparent ceramic tube 10 are fixedly installed through a second support column, the infrared heating ring 8 is located between the reflection wall 9 and the high temperature resistant transparent ceramic tube 10, and two ends of the high temperature resistant transparent ceramic tube 10 are not in contact with the furnace door baffle 3 and the partition plate 7.
When the annealing furnace works, wires needing annealing treatment enter the annealing chamber 11 through the front furnace door 2 and then enter the high-temperature resistant transparent ceramic tube 10, the reflecting wall 9 is fixedly arranged outside the high-temperature resistant transparent ceramic tube 10, the infrared heating ring 8 is positioned between the reflecting wall 9 and the high-temperature resistant transparent ceramic tube 10, the power supply is turned on at the moment, the infrared heating ring 8 starts to heat, at the moment, the reflecting wall 9 can reflect part of the emitted heat back to the high-temperature resistant transparent ceramic tube 10, the heating rate in the heating process is further improved, the heat loss and the heating energy consumption in the heating process are reduced, meanwhile, the wires are too long in length in the annealing process, the wires are likely to shake under the influence of the tension, the shaking range of the wires is limited due to the fact that the wires are heated in the high-temperature resistant transparent ceramic tube 10, and the damage of the infrared heating ring 8 caused by the fact that the wires shake and impact the infrared heating ring 8 in the heating process is avoided, affecting the normal use of the annealing furnace.
As an embodiment of the present invention, a heat pipe 6 is fixedly installed on the partition 7, the heat pipe 6 is located in the cooling chamber 12, the heat pipe 6 and the high temperature resistant transparent ceramic tube 10 are aligned with each other, the aperture of the heat pipe 6 is the same as that of the high temperature resistant transparent ceramic tube 10, a soft copper wire brush 61 is fixedly installed in the heat pipe 6, the soft copper wire brush 61 is distributed at intervals along the length direction of the heat pipe 6, an air inlet 62 is opened on the heat pipe 6, and the lower end of the air inlet pipeline 41 is fixedly connected with the air inlet 62.
When the device works, the heated wire rod enters the cooling chamber 12 through the material hole 71, at the moment, the wire rod enters the heat conduction pipe 6 fixedly connected with the material hole 71, at the moment, the industrial nitrogen is introduced into the cooling chamber 12 through the air inlet pipeline 41, since the lower end of the air inlet pipe 41 is fixedly connected to the air inlet holes 62 on the heat conductive pipe 6, the industrial nitrogen gas is directly introduced into the heat conductive pipe 6, the wire is cooled, and simultaneously when the wire passes through the heat conduction pipe 6, the soft copper wire brush 61 fixedly arranged in the heat conduction pipe 6 is directly contacted with the high-temperature wire to remove the residual sundries on the surface of the wire, meanwhile, due to the good heat conductivity of copper, the soft copper wire brush 61 can absorb heat on a part of wires after contacting the wires, the heat is dissipated to industrial nitrogen gas entering the heat conduction pipe 6 through the soft copper wire brush 61 with larger relative surface area and the heat conduction pipe 6, and the cooling efficiency of the wires is further improved.
In an embodiment of the present invention, the heat conducting pipe 6 is provided with material dropping holes 63, the material dropping holes 63 are located at intervals of the soft copper wire brushes 61, and the air inlet holes 62 are oblique holes with an oblique angle.
When the industrial nitrogen enters the heat conduction pipe 6 fixedly connected with the material falling hole, the impurity chips are prevented from being accumulated in the heat conduction pipe 6 to affect the normal work of the heat conduction pipe, meanwhile, the air inlet hole 62 is an inclined hole with a certain inclination angle, when the industrial nitrogen is introduced into the heat conduction pipe 6 through the air inlet pipeline 41 fixedly connected with the air inlet hole 62, the industrial nitrogen blows through the soft copper wire brush 61, so that the impurity chips remained on the soft copper wire brush 61 fall, the heat conduction pipe 6 is further fallen out of the material falling hole 63 to avoid affecting the normal work of the heat conduction pipe 6, meanwhile, the soft copper wire brush 61 is also cooled to a certain degree, so that the soft copper wire brush 61 can continuously absorb the heat of the wire, thereby improving the cooling efficiency of the wire rod.
An annealing process of martensitic stainless steel 2Cr13 wire, which is suitable for the annealing furnace of martensitic stainless steel 2Cr13 wire, and comprises the following steps:
s1, opening the furnace door baffle 3 at the front furnace door 2, putting the wire into the annealing furnace, and descending the furnace door baffle 3 downwards to reduce the gap between the front furnace door 2 and the inner surface of the box body 1;
s2, introducing industrial nitrogen into the annealing furnace from the air inlet pipeline 41;
s3, turning on a power supply to enable the infrared heating ring 8 to start heating, increasing the temperature in the annealing chamber 11, and enabling the wire to be conveyed into the cooling chamber 12 through the material hole 71 after the wire is annealed in the annealing chamber 11;
s4, introducing industrial nitrogen into the cooling chamber 12 from the air inlet pipeline 41 to cool the high-temperature wire rod, and pumping the industrial nitrogen heated in the cooling chamber 12 to the front end of the annealing chamber 11 through the circulating pipeline 43 by the pumping and exhausting air pump 42 for preheating;
and S5, taking out the annealed wire from the rear furnace door 5.
The specific working process is as follows:
the front furnace door 2 is opened upwards, any required furnace door baffle 3 positioned in a groove I22 in the front furnace door 2 slides upwards under the action of an upward force, a T-shaped groove 34 and a T-shaped sliding block are respectively arranged between two adjacent furnace door baffles 3, meanwhile, the upper end of each furnace door baffle 3 is fixedly connected with a spring I21, and the spring I21 is fixedly connected in the groove I22, so when the furnace door baffles 3 are subjected to the upward force, the spring I21 is compressed upwards to be in a pressing state, the furnace door baffles 3 slide upwards in the T-shaped grooves 34, the front furnace door 2 is in an opening state, wires needing annealing operation are put into a high-temperature resistant transparent ceramic tube 10 in an annealing chamber 11 in an annealing furnace, the upward force applied to the furnace door baffles 3 is removed, at the moment, the spring I21 restores to a natural state to push the furnace door baffles 3 to move downwards, at the moment, the furnace door baffles 3 move downwards under the action of self gravity and the pushing of the spring I21, the forehearth door 2 is closed, the roller 32 in the groove II 36 at the lower end of the furnace door baffle plate 3 is in direct contact with the wire to be annealed, the roller 32 rotates on the rotating shaft 35, when the roller 32 is in direct contact with the wire, the wire contacts the high-temperature-resistant fireproof cloth 31 first, the wire continues to extrude the high-temperature-resistant fireproof cloth 31 under the downward acting force of the furnace door baffle plate 3, at the moment, the high-temperature-resistant fireproof cloth 31 in a tensioning state is sunken towards the middle sunken position of the roller 32 along with the extrusion of the wire until the inner surface of the high-temperature-resistant fireproof cloth 31 is in contact with the middle sunken position of the roller 32, a power supply is turned on, the infrared heating ring 8 starts to heat up rapidly, the reflecting wall 9 reflects part of the heat emitted back into the high-temperature-resistant transparent ceramic tube 10 to carry out the heating process in the annealing process, after the heating is finished, the heated high-temperature wire enters the heat conduction tube in the cooling chamber 12 through the material hole 71, at this time, the industrial nitrogen is conveyed into the heat conduction pipe 6 in the cooling chamber 12 through the air inlet pipeline 41 to cool the high-temperature wire rods, and simultaneously protect the wire rods, and when the wire rods pass through the heat conduction pipe 6, the soft copper wire brush 61 fixedly installed in the heat conduction pipe 6 is in direct contact with the high-temperature wire rods. After the cooling is completed, the heated industrial nitrogen in the cooling chamber 12 is sucked out through the circulating pipeline 43 extending into the cooling chamber 12 by the pumping and exhausting air pump 42, and then the heated industrial nitrogen is introduced into the front end of the annealing chamber 11 through one end of the circulating pipeline 43 extending into the annealing chamber 11, after the cooling of the wire rod is completed, the annealed wire rod is taken out by upwards opening the rear furnace door 5, and then the rear furnace door 5 is closed.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (7)
1. An annealing furnace of martensite stainless steel 2Cr13 wire rod, which is characterized in that: including box (1), box (1) cavity, box (1) both ends respectively fixed mounting have preceding furnace door (2) and back furnace door (5), box (1) internal fixation installs baffle (7), baffle (7) are located and are close to back furnace door (5) one side, material hole (71) have been seted up on baffle (7), baffle (7) divide into two cavity interval annealing room (11) and cooling chamber (12) in with box (1), fixed surface installs air inlet pipeline (41) and circulating line (43) on box (1), the lower extreme of air inlet pipeline (41) stretches into in cooling chamber (12), the one end of circulating line (43) stretches into in cooling chamber (12), and the other end stretches into in annealing chamber (11), fixed mounting has pump exhaust air pump (42) on circulating line (43), pump exhaust air pump (42) fixed mounting is at the upper surface of box (1), a plurality of infrared heating rings (8) are arranged in the annealing chamber (11), the infrared heating rings (8) are fixedly arranged on the side wall of the annealing chamber (11) through a support column, the infrared heating rings (8) are uniformly distributed along the length direction, the central line of the infrared heating ring (8) is superposed with the central line of the material hole (71), a first groove (22) is formed in the front furnace door (2), a first spring (21) is fixedly arranged in the first groove (22), the first springs (21) are positioned on the lower surface of the first groove (22), the first springs (21) are uniformly distributed in the first groove (22) along the width direction, the lower end of the first spring (21) is fixedly connected with a plurality of furnace door baffles (3), the furnace door baffles (3) are arranged in total, and the furnace door baffles (3) are uniformly distributed in the first groove (22) along the width direction, the lower end face of the furnace door baffle (3) is in contact with the inner lower surface of the box body (1).
2. The annealing furnace of martensitic stainless steel 2Cr13 wire according to claim 1, characterized in that: the furnace door baffle (3) lower extreme has seted up recess two (36) along width direction, fixed mounting has axis of rotation (35) in recess two (36), rotation is installed roller (32) on axis of rotation (35).
3. The annealing furnace of martensitic stainless steel 2Cr13 wire according to claim 1, characterized in that: the roller (32) is a cylinder with an inward-concave middle area, the outer surface of the roller (32) is fixedly provided with a high-temperature-resistant fireproof cloth (31), one end of the high-temperature-resistant fireproof cloth (31) is fixedly connected with the roller (32), the other end of the high-temperature-resistant fireproof cloth (31) is fixedly connected with a second spring (33), and the second spring (33) is fixedly arranged at the other end of the roller (32).
4. The annealing furnace of martensitic stainless steel 2Cr13 wire according to claim 1, characterized in that: infrared heating ring (8) interpolation has high temperature resistant transparent ceramic pipe (10), high temperature resistant transparent ceramic pipe (10) are fixed in the both sides of annealing room (11) through support column one, reflection wall (9) are good at to high temperature resistant transparent ceramic pipe (10) both ends, reflection wall (9) are installed in high temperature resistant transparent ceramic pipe (10) outside, through two fixed mounting of support column between reflection wall (9) and high temperature resistant transparent ceramic pipe (10), infrared heating ring (8) are located between reflection wall (9) and high temperature resistant transparent ceramic pipe (10), contactless between high temperature resistant transparent ceramic pipe (10) both ends and furnace gate baffle (3) and baffle (7).
5. The annealing furnace of martensitic stainless steel 2Cr13 wire according to claim 1, characterized in that: fixed mounting has heat pipe (6) on baffle (7), heat pipe (6) are located cooling chamber (12), align each other between heat pipe (6) and high temperature resistant transparent ceramic pipe (10), heat pipe (6) are the same with high temperature resistant transparent ceramic pipe (10) aperture, fixed mounting has soft copper wire brush (61) in heat pipe (6), heat pipe (6) length direction interval distribution is followed in soft copper wire brush (61), soft copper wire brush (62) have been seted up on heat pipe (6), the lower extreme and soft copper wire brush (62) fixed connection of air inlet pipe way (41).
6. The annealing furnace of martensitic stainless steel 2Cr13 wire according to claim 1, characterized in that: seted up on heat pipe (6) and fallen material hole (63), fall material hole (63) and be located the interval department of soft copper wire brush (61), soft copper wire brush (62) are the slant hole that has inclination.
7. An annealing process of martensitic stainless steel 2Cr13 wire rod is characterized in that: the process is suitable for the annealing furnace of the martensitic stainless steel 2Cr13 wire rod of the previous claims 1-6, and the annealing process comprises the following steps:
s1, opening a furnace door baffle (3) at the front furnace door (2), putting the wire into an annealing furnace, and descending the furnace door baffle (3) downwards to reduce the gap between the front furnace door (2) and the inner surface of the box body (1);
s2, introducing industrial nitrogen into the annealing furnace from the air inlet pipeline (41);
s3, turning on a power supply to enable the infrared heating ring (8) to start heating, increasing the temperature in the annealing chamber (11), and enabling the wire to be conveyed into the cooling chamber (12) through the material hole (71) after the wire is annealed in the annealing chamber (11);
s4, introducing industrial nitrogen into the cooling chamber (12) from the air inlet pipeline (41) to cool the high-temperature wire rods, and then pumping the industrial nitrogen heated in the cooling chamber (12) to the front end of the annealing chamber (11) through the circulating pipeline (43) by the pumping and exhausting air pump (42) for preheating;
s5, taking out the annealed wire from the rear furnace door (5).
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