CN113564336B - 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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- CN113564336B CN113564336B CN202110744659.8A CN202110744659A CN113564336B CN 113564336 B CN113564336 B CN 113564336B CN 202110744659 A CN202110744659 A CN 202110744659A CN 113564336 B CN113564336 B CN 113564336B
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- 238000000137 annealing Methods 0.000 title claims abstract description 115
- 238000000034 method Methods 0.000 title claims abstract description 24
- 230000008569 process Effects 0.000 title claims abstract description 22
- 229910001105 martensitic stainless steel Inorganic materials 0.000 title claims abstract description 17
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 85
- 238000010438 heat treatment Methods 0.000 claims abstract description 67
- 238000001816 cooling Methods 0.000 claims abstract description 59
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 41
- 239000000463 material Substances 0.000 claims abstract description 31
- 239000000919 ceramic Substances 0.000 claims description 41
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 33
- 239000004744 fabric Substances 0.000 claims description 31
- 238000005192 partition Methods 0.000 claims description 18
- 238000005086 pumping Methods 0.000 claims description 10
- 230000017525 heat dissipation Effects 0.000 abstract description 6
- 238000004519 manufacturing process Methods 0.000 abstract 1
- 238000004064 recycling Methods 0.000 abstract 1
- 230000009471 action Effects 0.000 description 6
- 230000005484 gravity Effects 0.000 description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 238000001125 extrusion Methods 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 229910001873 dinitrogen Inorganic materials 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 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
- 238000010791 quenching Methods 0.000 description 2
- 230000000171 quenching effect Effects 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
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 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
- 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
- 230000000737 periodic effect Effects 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
- 230000032258 transport Effects 0.000 description 1
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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- Chemical & Material Sciences (AREA)
- 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, in particular to an annealing furnace and an annealing process of martensitic stainless steel 2Cr13 wire rods, which comprise the following steps: including the box, box both ends are fixed mounting respectively has preceding furnace gate and back furnace gate, fixed mounting has the baffle in the box, set up the material hole on the baffle, the baffle is divided into two cavity interval annealing rooms and cooling chamber in with the box, fixed mounting has inlet line and circulation pipeline on the box, fixed mounting has the pump of taking out on the circulation pipeline, install a plurality of infrared heating rings in the annealing chamber, set up fluted first in the preceding furnace gate, fixed mounting has spring first in the recess, spring lower extreme fixedly connected with furnace gate baffle. The structure of the invention can reduce gaps formed between the furnace door and the box body and between wires through the arrangement of the furnace door baffle, reduce heat dissipation, realize recycling of nitrogen and reduce production cost.
Description
Technical Field
The invention belongs to the technical field of annealing equipment, and particularly relates to an annealing furnace and an annealing process of 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 tempering furnace, and is mainly used for annealing large-scale carbon steel and alloy steel parts; tempering the surface quenching part; and (5) a heat treatment process of stress relief annealing, aging and the like of the weldment. The heating mode is electric heating, fuel oil, fuel gas, fire 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 an ultra-energy-saving structure, adopts a fiber structure and saves electricity by 60 percent.
Some technical schemes related to an annealing furnace also exist in the prior art, for example, china patent with the application number of CN201821451661.6 discloses continuous annealing equipment of stainless steel wires, which comprises an annealing furnace, a heating component, an output component and a cooling system; according to the technical scheme, the wire rod entering the annealing furnace is heated at a high temperature in a short time by utilizing the high-frequency infrared induction heater, then in the transportation process of the annealing furnace, the input nitrogen takes away heat on the wire rod and transports the wire rod to one end of the heating assembly, the wire rod transported at a high temperature is cooled while the heating efficiency is improved, an annealing effect is formed, the possibility of oxidation of the wire rod is eliminated by the annealing furnace filled with inert gas, and the annealing efficiency and quality are improved. However, in the technical scheme, when annealing is performed, the opening height of the furnace door is fixed when the wire enters the furnace door, so that the heat loss is high, nitrogen is needed for absorbing heat by utilizing nitrogen, the heat recovery is incomplete, and the resource waste is high.
Disclosure of Invention
In order to overcome the defects in the prior art and solve the problems that when annealing is performed, the furnace door is fixed in opening height when wires enter the furnace door, so that the heat loss is high, nitrogen is needed for absorbing heat by utilizing nitrogen, the heat recovery is incomplete, and the resource waste is high, the invention provides an annealing furnace and an annealing process for martensitic stainless steel 2Cr13 wires.
The technical scheme adopted for solving the technical problems is as follows: the invention discloses an annealing furnace and an annealing process for martensitic stainless steel 2Cr13 wires, comprising 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, the partition plate is positioned at one side close to the rear furnace door, a material hole is formed in the partition plate, the interior of the box body is divided into two hollow sections of an annealing chamber 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 stretches into the cooling chamber, one end of the circulating pipeline stretches into the cooling chamber, the other end of the circulating pipeline stretches into the annealing chamber, an exhaust pump is fixedly arranged on the circulating pipeline, the exhaust pump is fixedly arranged on the upper surface of the box body, a plurality of infrared heating rings are arranged in the annealing chamber, the infrared heating rings are fixedly arranged on the side wall of the annealing chamber through struts, the infrared heating rings are uniformly distributed in the length direction, the central lines of the infrared heating rings are overlapped with the central lines of the material hole, a groove is formed in the front furnace door, one end of the groove is fixedly arranged in the groove, the groove is formed in the front of the spring is uniformly distributed in the groove, the groove is uniformly contacts with the lower end of the furnace door, the spring is uniformly distributed in the groove is arranged in the lower surface of the groove, and is uniformly distributed in the groove is uniformly contacts with the lower surface of the baffle plate, and is uniformly distributed in the groove is uniformly distributed along the groove is in the lower surface is uniformly is in the groove, and is in the groove is uniformly distributed along the groove is in the same.
When the furnace door baffle is opened upwards, a certain number of furnace door baffles are opened upwards according to the diameter of a wire rod, because the furnace door baffles are positioned in the groove I in the front furnace door, a T-shaped groove and a T-shaped sliding block are respectively arranged between two adjacent furnace door baffles, the upper end of each furnace door baffle is fixedly connected with a spring I, and the springs I are fixedly connected in the groove I, so when the furnace door baffles are opened upwards, the furnace door baffles are compressed upwards under upward acting force, the springs I are in a compression state, the furnace door baffles slide upwards in the T-shaped groove, the wire rod is placed in the annealing furnace from the front furnace door, then the upward acting force on the furnace door baffles is removed, at the moment, the springs I restore the natural state to downwards elastic force on the furnace door baffles, and therefore, under the action of gravity of the furnace door baffles and the elastic force of the springs I on the furnace door baffles, only the furnace door baffles above the wire rod are slid downwards to the upper side of the wire rod, and gaps existing between the furnace door baffles and the inner surfaces of the box body are all in a closed state, and gaps formed between the furnace door baffles and the wire rod and the inner surfaces of the box body are reduced, and heat dissipation is reduced; at this moment, firstly, carry industry nitrogen to the cooling chamber through the air inlet pipeline and the pump of taking out exhaust carries industry nitrogen to the annealing chamber through the circulation pipeline, when waiting that industry nitrogen is fully full of in the annealing stove, open the power, make the infrared heating ring begin to heat up, at this moment, industry nitrogen in the annealing chamber protects the wire rod, avoid the wire rod to contact oxygen and take place the oxidation in the high temperature heating in-process, after the heating is accomplished, the wire rod passes through the material hole and gets into the cooling chamber, at this moment, industry nitrogen that is located the cooling chamber cools down the wire rod, protect the wire rod simultaneously, so as to avoid the high temperature wire rod to contact oxygen and take place the oxidation in the cooling chamber, simultaneously the pump of taking out the industry nitrogen after heating in the cooling chamber and discharge the annealing chamber front end through the circulation pipeline, make unheated wire rod can obtain certain preheating, take out the industry nitrogen after the heating through the circulation pipeline and take out the annealing chamber after the online material preheating is accomplished, continue to cool down through the air inlet pipeline conveying to the wire rod, after the cooling is accomplished, take out the wire rod from the furnace gate after the cooling is repeated above-mentioned step.
Preferably, the lower end of the furnace door baffle is provided with a second groove along the width direction, a rotating shaft is fixedly arranged in the second groove, and a roller is rotatably arranged on the rotating shaft.
During operation, the furnace door baffle in the first furnace door inner groove is opened upwards, the wire rod needing annealing operation is placed in, then the furnace door baffle is closed downwards, at the moment, the roller in the second furnace door baffle lower end groove is in direct contact with the wire rod needing annealing operation, after the roller is in direct contact with the wire rod, the roller rotates on the rotating shaft, the surface of the wire rod is scraped by direct contact with the wire rod when the furnace door baffle is closed downwards, and meanwhile, the impact force of the wire rod when the furnace door baffle is closed downwards can be reduced through the rotation of the roller, so that the wire rod is prevented from being directly impacted by the furnace door baffle to shake when the furnace door baffle is closed downwards.
Preferably, the roller is a cylinder with an inward concave middle area, the outer surface of the roller is fixedly provided with 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 wire rod to be annealed is put into the annealing furnace, the furnace door baffle is closed, at the moment, the roller on the furnace door baffle is directly contacted with the wire rod, and the roller is in a shape shown in an attached drawing 6 of the specification, the high-temperature-resistant fireproof cloth is arranged on the outer surface of the roller, and meanwhile, the high-temperature-resistant fireproof cloth is always in a tensioning state because two ends of the high-temperature-resistant fireproof cloth are respectively fixedly connected to one end of the roller and the spring II, so that when the roller is directly contacted with the wire rod, the wire rod is firstly contacted with the high-temperature-resistant fireproof cloth, the wire rod continuously extrudes the high-temperature-resistant fireproof cloth under the action of the gravity of the furnace door baffle and the elasticity of the spring pair of furnace door baffles, and at the moment, the high-temperature-resistant fireproof cloth in the tensioning state is sunken towards the middle of the roller along with the extrusion of the wire rod, so that gaps between the furnace door baffle and the wire rod are changed into gaps formed between the roller and the wire rod and the inner surface of the box, and gaps formed between the inner surface of the wire rod and the inner surface of the box are further reduced, and heat loss is further reduced.
Preferably, the infrared heating ring is inserted with a high-temperature-resistant transparent ceramic tube, the high-temperature-resistant transparent ceramic tube is fixed on two sides of the annealing chamber through a first supporting column, two ends of the high-temperature-resistant transparent ceramic tube are longer than the reflecting wall, the reflecting wall is arranged on the outer side of the high-temperature-resistant transparent ceramic tube, the reflecting wall and the high-temperature-resistant transparent ceramic tube are fixedly arranged through a second supporting column, the infrared heating ring is positioned between the reflecting wall and the high-temperature-resistant transparent ceramic tube, and two ends of the high-temperature-resistant transparent ceramic tube are not contacted with the furnace door baffle and the partition plate.
When the annealing furnace works, wires to be annealed enter the high-temperature-resistant transparent ceramic tube after entering the annealing chamber through the front furnace door, as 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, a power supply is started at the moment, and the infrared heating ring starts to heat, at the moment, the reflecting wall can reflect part of emitted heat back into the high-temperature-resistant transparent ceramic tube, so that the heating rate in the heating process is improved, and meanwhile, the heat loss and the heating energy consumption in the heating process are reduced, and meanwhile, the wires can shake due to the fact that the length of the wires in the annealing process is overlong, and the wires can be influenced by the tension, and because the wires are heated in the high-temperature-resistant transparent ceramic tube, the shaking range of the wires is limited, so that the wires are prevented from being damaged due to shaking and bumping into the infrared heating ring in the heating process, and the normal use of the annealing furnace is influenced.
Preferably, the baffle is provided with a heat conducting pipe fixedly arranged on the baffle, the heat conducting pipe is positioned in the cooling chamber, the heat conducting pipe and the high-temperature-resistant transparent ceramic pipe are mutually aligned, the aperture of the heat conducting pipe is the same as that of the high-temperature-resistant transparent ceramic pipe, the heat conducting pipe is internally provided with a soft copper wire brush fixedly arranged on the inner side of the heat conducting pipe, the soft copper wire brushes are distributed at intervals along the length direction of the heat conducting pipe, the heat conducting pipe is provided with an air inlet hole, and the lower end of the air inlet pipeline is fixedly connected with the air inlet hole.
During operation, the wire rod that the heating was accomplished gets into the cooling chamber through the material hole, the wire rod gets into in the heat pipe with material hole fixed connection this moment, industry nitrogen gas lets in the cooling chamber through the admission line this moment, because inlet port fixed connection on lower extreme and the heat pipe of admission line, consequently, industry nitrogen gas directly lets in the heat pipe, cool down to the wire rod, simultaneously when the wire rod when the heat pipe is passed through, fixed mounting's soft copper wire brush and high temperature wire rod direct contact in the heat pipe, clear away the miscellaneous bits that remain on the wire rod surface, simultaneously because the good heat conductivity of copper for soft copper wire brush can absorb the heat on a portion wire rod after contacting the wire rod, give off the heat in the industry nitrogen gas that lets in the heat pipe through soft copper wire brush and the heat pipe that relative surface area is bigger, and then improve the cooling efficiency of wire rod.
Preferably, the heat conducting pipe is provided with a material dropping hole, the material dropping hole is positioned at the interval of the soft copper wire brushes, and the air inlet hole is an inclined hole with an inclined angle.
When the wire rod after the heating is finished enters the cooling chamber to be cooled, the wire rod enters the heat conducting pipe fixedly connected with the material hole, the soft copper wire brush in the heat conducting pipe is used for removing the miscellaneous bits on the surface of the wire rod, meanwhile, the removed miscellaneous bits fall out of the heat conducting pipe through the material falling hole, the miscellaneous bits are prevented from accumulating in the heat conducting pipe to influence the normal work of the heat conducting pipe, meanwhile, the air inlet hole is an inclined hole with a certain inclined angle, when industrial nitrogen is introduced into the heat conducting pipe through the air inlet pipeline fixedly connected with the air inlet hole, the industrial nitrogen can blow through the soft copper wire brush, the miscellaneous bits remained on the soft copper wire brush further fall, the heat conducting pipe falls out of the material falling hole, the influence on the normal work of the heat conducting pipe is avoided, meanwhile, the soft copper wire brush is also cooled to a certain degree, the soft copper wire brush can continuously absorb the heat of the wire rod, and the cooling efficiency of the wire rod is improved.
An annealing process of a martensitic stainless steel 2Cr13 wire, the process being suitable for an annealing furnace of the martensitic stainless steel 2Cr13 wire, the annealing process comprising the steps of:
s1, opening a furnace door baffle at a front furnace door, putting wires into an annealing furnace, and descending the furnace door baffle to reduce a 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, and raising the temperature in the annealing chamber, so that the wire rod is conveyed into the cooling chamber through the material hole after annealing in the annealing chamber (11) is completed;
s4, introducing industrial nitrogen into the cooling chamber from the air inlet pipeline to cool the high-temperature wire rod, and then pumping the heated industrial nitrogen in the cooling chamber to the front end of the annealing chamber through the circulating pipeline by the pumping pump to preheat;
s5, taking out the annealed wire rod from the rear furnace door.
The beneficial effects of the invention are as follows:
1. according to the annealing furnace for the martensitic stainless steel 2Cr13 wire rod, the furnace door baffle plates, the first springs, the rollers and the high-temperature-resistant fireproof cloth are arranged, and the single furnace door baffle plates are vertically slid through the T-shaped grooves on the adjacent sides between the furnace door baffle plates and the T-shaped sliding blocks, so that the minimum opening height of the furnace door baffle plates is adjusted along with the diameter of the wire rod, gaps formed between the furnace door and the inner surface of the box body are reduced, excessive heat dissipation is avoided, the rollers are arranged to enable the furnace door baffle plates to be contacted with the wire rod and rotate with the wire rod when the furnace door baffle plates are closed, damage to the surface of the wire rod is avoided, the high-temperature-resistant fireproof cloth is matched with the special shape of the rollers on the outer surfaces of the rollers, the wire rod can be continuously recessed towards the inner sides of the rollers after the wire rod is contacted with the high-temperature-resistant fireproof cloth, gaps of the furnace door baffle plates are smaller when the furnace door baffle plates are closed, and heat dissipation is reduced.
2. According to the annealing furnace for martensitic stainless steel 2Cr13 wires, the exhaust pump and the circulating pipeline are arranged, so that heated industrial nitrogen remained in the cooling chamber after cooling can be conveyed to the front end of the annealing chamber under the action of the exhaust pump, the effect of preheating the wires is achieved, the heating rate of the wires is improved, meanwhile, the heating efficiency of an infrared heating ring can be improved due to the arrangement of the high-temperature-resistant transparent ceramic tube 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 conduction pipe, the soft copper wire brush, the air inlet hole and the dropping hole are arranged, heat in the high-temperature wire is absorbed through good heat conduction 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, and further, the miscellaneous scraps generated in the annealing process of the wire are removed, and the air inlet hole and the dropping hole with a certain inclined angle are arranged, so that the wire miscellaneous scraps remained in the soft copper wire brush can be blown down by industrial nitrogen, and further, the heat conduction pipe is dropped out from the dropping hole.
Drawings
The invention is further described below with reference to the accompanying 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 a partial enlarged view at D in FIG. 1;
in the figure: the annealing furnace 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, rollers 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 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 62, a material dropping hole 63, a partition 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
The invention is further described in connection with the following detailed description in order to make the technical means, the creation characteristics, the achievement of the purpose and the effect of the invention easy to understand.
As shown in fig. 1 to 7, the annealing furnace for martensitic stainless steel 2Cr13 wire comprises a box body 1, wherein the box body 1 is hollow, a front furnace door 2 and a rear furnace door 5 are respectively and fixedly arranged at two ends of the box body 1, a partition plate 7 is fixedly arranged in the box body 1, the partition plate 7 is positioned at one 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 sections of an annealing chamber 11 and a cooling chamber 12, an air inlet pipeline 41 and a circulating pipeline 43 are fixedly arranged 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 circulating pipeline 43 extends into the cooling chamber 12, the other end extends into the annealing chamber 11, an air pumping pump 42 is fixedly arranged on the circulating pipeline 43, the air pumping pump 42 is fixedly arranged on the upper surface of the box body 1, the annealing chamber 11 is internally provided with a plurality of infrared heating rings 8, the infrared heating rings 8 are fixedly arranged on the side wall of the annealing chamber 11 through struts, the infrared heating rings 8 are uniformly distributed along the length direction, the center line of each infrared heating ring 8 coincides with the center line of each material hole 71, the front furnace door 2 is internally provided with a first groove 22, the first groove 22 is internally fixedly provided with a first spring 21, the first spring 21 is positioned on the lower surface of the first groove 22, the first spring 21 is uniformly distributed along the width direction in the first groove 22, 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 uniformly distributed along the width direction in the first groove 22, and the lower end surface of the furnace door baffles 3 is contacted with the lower surface of the interior of the box body 1.
When the furnace door baffle 3 is opened upwards, a certain number of furnace door baffles 3 are opened upwards according to the diameter of a wire rod, because the furnace door baffles 3 are positioned in the first groove 22 in the front furnace door 2, and meanwhile, a T-shaped groove 34 and a T-shaped sliding block are respectively arranged between two adjacent furnace door baffles 3, the upper end of each furnace door baffle 3 is fixedly connected with a first spring 21, and the first springs 21 are fixedly connected in the first groove 22, so when the furnace door baffles 3 are opened upwards, the furnace door baffles 3 are compressed upwards under the upward acting force, the first springs 21 are in a compressed state, the furnace door baffles 3 slide upwards in the T-shaped groove 34, the wire rod is placed in the annealing furnace from the front furnace door 2, then the upward acting force on the furnace door baffles 3 is removed, and the first springs 21 restore the natural state to generate downward elasticity on the furnace door baffles 3, and therefore, the furnace door baffles 3 slide downwards to the upper side of the wire rod under the action of gravity of the furnace door baffles 3, only the furnace door baffles 3 are in the opened state and gaps exist between the inner surfaces of a box body 1, and the heat dissipation between the inner surfaces of the box body 1 and the whole furnace door baffles 3 is reduced, and the whole heat dissipation state between the surfaces of the furnace door baffles 3 is reduced; at this time, firstly, industrial nitrogen is conveyed into the cooling chamber 12 through the air inlet pipeline 41, the industrial nitrogen is conveyed into the annealing chamber 11 through the circulating pipeline 43 by the air pump 42, when the industrial nitrogen is fully filled in the annealing furnace, the power supply is started, the infrared heating ring 8 starts to heat and raise the temperature, at this time, the industrial nitrogen in the annealing chamber 11 protects wires, the wires are prevented from being oxidized by oxygen in the high-temperature heating process, after the wires are heated, the wires enter the cooling chamber 12 through the material holes 71, at this time, the industrial nitrogen in the cooling chamber 12 cools the wires, meanwhile, the wires are protected, so that the high-temperature wires are prevented from being oxidized by oxygen in the cooling chamber 12, meanwhile, the air pump 42 pumps and discharges the heated industrial nitrogen in the cooling chamber 12 to the front end of the annealing chamber 11 through the circulating pipeline 43, so that the unheated wires can be preheated to a certain extent, after the wires are preheated, the heated industrial nitrogen is pumped out of the annealing chamber 11 through the circulating pipeline 43, filtered and cooled, the wires are continuously conveyed into the cooling chamber 12 through the air inlet pipeline 41, cooled, after the cooling is completed, the wires are cooled, the furnace doors are cooled, and finally, the steps are repeated after the cooling is completed, and the wires are taken out from the annealing chamber 5.
As an embodiment of the present invention, the lower end of the oven door baffle 3 is provided with a second groove 36 along the width direction, a rotation shaft 35 is fixedly installed in the second groove 36, and a roller 32 is rotatably installed on the rotation shaft 35.
During operation, the furnace door baffle 3 in the first groove 22 in the front furnace door 2 is opened upwards, wires needing annealing operation are placed in the furnace door baffle 3, then the furnace door baffle 3 is closed downwards, at the moment, the roller 32 in the second groove 36 at the lower end of the furnace door baffle 3 is in direct contact with the wires needing annealing operation, after the roller 32 is in direct contact with the wires, the roller 32 rotates on the rotating shaft 35, the surface of the wire is scraped by the direct contact with the wires when the furnace door baffle 3 is closed downwards, and meanwhile, the impact force of the wires when the furnace door baffle 3 is closed downwards is lowered through the rotation of the roller 32, so that the wires are prevented from being directly impacted by the furnace door baffle 3 to shake when the furnace door baffle 3 is closed downwards.
As one embodiment of the invention, the roller 32 is a cylinder with an inward concave middle area, the outer surface of the roller 32 is fixedly provided with the 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 the second spring 33, and the second spring 33 is fixedly arranged at the other end of the roller 32.
When the wire rod annealing furnace is in operation, after the wire rod to be annealed is put into the annealing furnace, the furnace door baffle 3 is closed, at the moment, the roller 32 positioned on the furnace door baffle 3 is directly contacted with the wire rod, because the roller 32 is in the shape shown in the figure 6 of the specification, and the high-temperature-resistant fireproof cloth 31 is arranged on the outer surface of the roller 32, and meanwhile, the high-temperature-resistant fireproof cloth 31 is always in a tensioning state because two ends of the high-temperature-resistant fireproof cloth 31 are respectively fixedly connected to one end of the roller 32 and the spring II 33, when the roller 32 is directly contacted with the wire rod, the wire rod is firstly contacted with the high-temperature-resistant fireproof cloth 31, under the action of the gravity of the furnace door baffle 3 and the elastic force of the spring I21 on the furnace door baffle 3, the wire rod continuously extrudes the high-temperature-resistant fireproof cloth 31, at the moment, the high-temperature-resistant fireproof cloth 31 in the tensioning state is sunken towards the middle of the roller 32 along with the extrusion of the wire rod, so that gaps between the furnace door baffle 3 and the wire rod 1 and the wire rod become gaps formed between the wire rod and the high-temperature-resistant fireproof cloth 31 and the inner surface of the box 1, thereby further reducing the gaps formed after extrusion, and the gaps between the high-temperature-resistant fireproof cloth 31.
As one embodiment of the invention, the infrared heating ring 8 is inserted with a high temperature resistant transparent ceramic tube 10, the high temperature resistant transparent ceramic tube 10 is fixed on two sides of the annealing chamber 11 through a first supporting column, two ends of the high temperature resistant transparent ceramic tube 10 are longer than the reflecting wall 9, the reflecting wall 9 is arranged on the outer side of the high temperature resistant transparent ceramic tube 10, the reflecting wall 9 and the high temperature resistant transparent ceramic tube 10 are fixedly arranged through a second supporting column, the infrared heating ring 8 is positioned between the reflecting 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 contacted with the furnace door baffle 3 and the partition 7.
When the annealing furnace works, wires to be annealed enter the high-temperature-resistant transparent ceramic tube 10 after entering the annealing chamber 11 through the front furnace door 2, 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, a power supply is started at the moment, the infrared heating ring 8 starts to heat, at the moment, the reflecting wall 9 can reflect part of emitted heat back into the high-temperature-resistant transparent ceramic tube 10, so that the heating rate in the heating process is improved, and meanwhile, the heat loss and the heating energy consumption in the heating process are reduced, meanwhile, the wires are possibly vibrated under the influence of the tension due to the overlong length of the wires in the annealing process, and the vibration range of the wires is limited due to the fact that the wires are heated in the high-temperature-resistant transparent ceramic tube 10, so that the wires are prevented from being vibrated and collided with the infrared heating ring 8 in the heating process, the infrared heating ring 8 is damaged, and normal use is influenced.
As an embodiment of the present invention, the heat-conducting tube 6 is fixedly installed on the partition 7, the heat-conducting tube 6 is located in the cooling chamber 12, the heat-conducting tube 6 and the high temperature resistant transparent ceramic tube 10 are aligned with each other, the aperture of the heat-conducting tube 6 is the same as that of the high temperature resistant transparent ceramic tube 10, soft copper wire brushes 61 are fixedly installed in the heat-conducting tube 6, the soft copper wire brushes 61 are distributed at intervals along the length direction of the heat-conducting tube 6, an air inlet hole 62 is formed in the heat-conducting tube 6, and the lower end of the air inlet pipeline 41 is fixedly connected with the air inlet hole 62.
During operation, the heated wire enters the cooling chamber 12 through the material hole 71, the wire enters the heat conducting pipe 6 fixedly connected with the material hole 71, at the moment, industrial nitrogen is introduced into the cooling chamber 12 through the air inlet pipeline 41, the lower end of the air inlet pipeline 41 is fixedly connected with the air inlet hole 62 on the heat conducting pipe 6, therefore, the industrial nitrogen is directly introduced into the heat conducting pipe 6, the wire is cooled, meanwhile, when the wire passes through the heat conducting pipe 6, the soft copper wire brush 61 fixedly installed in the heat conducting pipe 6 is directly contacted with the high-temperature wire, residual scraps on the surface of the wire are removed, and meanwhile, due to good heat conductivity of copper, the soft copper wire brush 61 can absorb part of heat on the wire after contacting the wire, and the heat is dissipated into the industrial nitrogen introduced into the heat conducting pipe 6 through the soft copper wire brush 61 with larger relative surface area and the heat conducting pipe 6, so that the cooling efficiency of the wire is improved.
As an embodiment of the present invention, the heat conducting pipe 6 is provided with a material dropping hole 63, the material dropping hole 63 is located at a space of the soft copper wire brush 61, and the air inlet hole 62 is an oblique hole with an oblique angle.
When the wire rod after the heating is completed enters the cooling chamber 12 for cooling, the wire rod enters the heat conducting tube 6 fixedly connected with the material hole 71, the soft copper wire brush 61 in the heat conducting tube 6 is used for removing the miscellaneous chips on the surface of the wire rod, meanwhile, the removed miscellaneous chips fall out of the heat conducting tube 6 through the material falling hole, the miscellaneous chips are prevented from accumulating in the heat conducting tube 6 to influence the normal operation of the heat conducting tube, meanwhile, the air inlet hole 62 is an inclined hole with a certain inclined angle, when industrial nitrogen is introduced into the heat conducting tube 6 through the air inlet pipeline 41 fixedly connected with the air inlet hole 62, the industrial nitrogen blows the position of the soft copper wire brush 61, the miscellaneous chips remained on the soft copper wire brush 61 fall down, the heat conducting tube 6 falls out of the material falling hole 63, the influence on the normal operation of the heat conducting tube 6 is avoided, meanwhile, the soft copper wire brush 61 is cooled to a certain extent, the soft copper wire brush 61 can continuously absorb the heat of the wire rod, and the cooling efficiency of the wire rod is further improved.
An annealing process of a martensitic stainless steel 2Cr13 wire, the process being suitable for an annealing furnace of the martensitic stainless steel 2Cr13 wire, the annealing process comprising the steps of:
s1, opening a furnace door baffle 3 at the front furnace door 2, placing wires into an annealing furnace, and descending the furnace door baffle 3 downwards to reduce a 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, and raising the temperature in the annealing chamber 11, so that the wire rod is conveyed into the cooling chamber 12 through the material hole 71 after annealing in the annealing chamber 11 is finished;
s4, introducing industrial nitrogen into the cooling chamber 12 from the air inlet pipeline 41 to cool the high-temperature wire rod, and then pumping the heated industrial nitrogen in the cooling chamber 12 to the front end of the annealing chamber 11 for preheating by the pumping pump 42 through the circulating pipeline 43;
and S5, taking out the annealed wire rod from the rear furnace door 5.
The specific working procedure is as follows:
when the front furnace door 2 is opened upwards, any required furnace door baffle 3 positioned in the first groove 22 in the front furnace door 2 slides upwards under the upward acting force, as the T-shaped groove 34 and the T-shaped sliding block are respectively arranged between the two adjacent furnace door baffles 3, and the upper end of the furnace door baffle 3 is fixedly connected with the first spring 21 which is fixedly connected in the first groove 22, when the furnace door baffle 3 receives the upward acting force, the first spring 21 is compressed upwards to be in a compressed state, the furnace door baffle 3 slides upwards in the T-shaped groove 34, the front furnace door 2 is in an opened state, wires needing annealing operation are placed in the high temperature resistant transparent ceramic tube 10 in the annealing chamber 11 in the annealing furnace, the upward acting force given to the furnace door baffle 3 is removed, and the first spring 21 returns to a natural state to push the furnace door baffle 3 to move downwards, at this time, the furnace door baffle 3 moves downwards under the action of gravity and the pushing of the first spring 21 to close the front furnace door 2, at this time, the roller 32 in the groove two 36 at the lower end of the furnace door baffle 3 is in direct contact with the wire rod to be annealed, the roller 32 rotates on the rotating shaft 35, 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 downward acting force of the furnace door baffle 3, the wire rod continuously extrudes the high temperature resistant fireproof cloth 31, at this time, the high temperature resistant fireproof cloth 31 in a tensioned state is sunken towards the middle sunken position of the roller 32 along with the extrusion of the wire rod until the inner surface of the high temperature resistant fireproof cloth 31 is contacted with the middle sunken position of the roller 32, the power supply is turned on, the infrared heating ring 8 starts to heat quickly, the reflecting wall 9 reflects part of the emitted heat back into the high temperature resistant transparent ceramic tube 10 to heat in the annealing process, after the heating is finished, the heated high-temperature wire enters the heat conducting pipe in the cooling chamber 12 through the material hole 71, at the moment, industrial nitrogen is conveyed into the heat conducting pipe 6 in the cooling chamber 12 through the air inlet pipeline 41 to cool down the high-temperature wire, the wire is protected at the same time, and meanwhile, when the wire passes through the heat conducting pipe 6, the soft copper wire brush 61 fixedly installed in the heat conducting pipe 6 is in direct contact with the high-temperature wire. After cooling is completed, the heated industrial nitrogen in the cooling chamber 12 is sucked out through a circulation pipeline 43 extending into the cooling chamber 12 by an exhaust pump 42, and then the heated industrial nitrogen is introduced into the front end of the annealing chamber 11 through one end of the circulation pipeline 43 extending into the annealing chamber 11, after wire cooling is completed, the annealed wire is taken out by opening the rear furnace door 5 upwards, and then the rear furnace door 5 is closed.
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (2)
1. An annealing furnace for martensitic stainless steel 2Cr13 wire is characterized in that: the device comprises a box body (1), wherein the box body (1) is hollow, a front furnace door (2) and a rear furnace door (5) are respectively and fixedly arranged at two ends of the box body (1), a partition plate (7) is fixedly arranged in the box body (1), the partition plate (7) is positioned close to one side of the rear furnace door (5), a material hole (71) is formed in the partition plate (7), the partition plate (7) is used for dividing the interior of the box body (1) into two hollow-interval annealing chambers (11) and a cooling chamber (12), an air inlet pipeline (41) and a circulating pipeline (43) are fixedly arranged on the upper surface of the box body (1), the lower end of the air inlet pipeline (41) stretches into the cooling chamber (12), one end of the circulating pipeline (43) stretches into the cooling chamber (12), the other end stretches into the annealing chamber (11), a pumping pump (42) is fixedly arranged on the circulating pipeline (43), the upper surface of the box body (1) is fixedly arranged on the pumping pump, a plurality of infrared heating rings (8) are arranged in the annealing chamber, the infrared heating rings (11) are arranged in the infrared heating rings (8) and the infrared heating rings (8) are uniformly distributed along the central lines (8) and the heating rings (8) are uniformly distributed along the central lines, 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 spring (21) is 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 ends of the first springs (21) are fixedly connected with a plurality of furnace door baffles (3), the furnace door baffles (3) are uniformly distributed in the first groove (22) along the width direction, and the lower end surface of the furnace door baffles (3) is in contact with the lower surface inside the box body (1);
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 arranged in the second groove (36), and a roller (32) is rotatably arranged on the rotating shaft (35);
the roller (32) is a cylinder with an inward concave middle area, the outer surface of the roller (32) is fixedly provided with 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);
the infrared heating ring (8) is internally inserted with a high-temperature-resistant transparent ceramic tube (10), the high-temperature-resistant transparent ceramic tube (10) is fixed on two sides of the annealing chamber (11) through a first supporting column, two ends of the high-temperature-resistant transparent ceramic tube (10) are longer than the reflecting wall (9), the reflecting wall (9) is arranged on the outer side of the high-temperature-resistant transparent ceramic tube (10), the reflecting wall (9) and the high-temperature-resistant transparent ceramic tube (10) are fixedly arranged through a second supporting column, the infrared heating ring (8) is positioned between the reflecting 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 contacted with the furnace door baffle (3) and the partition plate (7);
the heat conducting tube (6) is fixedly arranged on the partition plate (7), the heat conducting tube (6) is positioned in the cooling chamber (12), the heat conducting tube (6) and the high-temperature-resistant transparent ceramic tube (10) are mutually aligned, the aperture of the heat conducting tube (6) is the same as that of the high-temperature-resistant transparent ceramic tube (10), soft copper wire brushes (61) are fixedly arranged in the heat conducting tube (6), the soft copper wire brushes (61) are distributed at intervals along the length direction of the heat conducting tube (6), air inlets (62) are formed in the heat conducting tube (6), and the lower end of the air inlet pipeline (41) is fixedly connected with the air inlets (62);
the heat conduction pipe (6) is provided with a material dropping hole (63), the material dropping hole (63) is positioned at the interval of the soft copper wire brushes (61), and the air inlet hole (62) is an inclined hole with an inclined angle.
2. An annealing process of martensitic stainless steel 2Cr13 wire is characterized in that: the process is applicable to an annealing furnace of martensitic stainless steel 2Cr13 wire rods according to claim 1, and comprises the following steps:
s1, opening a furnace door baffle (3) at the front furnace door (2), putting wires into an annealing furnace, and descending the furnace door baffle (3) to reduce a 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 an air inlet pipeline (41);
s3, turning on a power supply to enable the infrared heating ring (8) to start heating, and raising the temperature in the annealing chamber (11), so that the wire rod is conveyed into the cooling chamber (12) through the material hole (71) after annealing in the annealing chamber (11) is completed;
s4, introducing industrial nitrogen into the cooling chamber (12) from the air inlet pipeline (41) to cool the high-temperature wire rod, and then pumping the heated industrial nitrogen in the cooling chamber (12) to the front end of the annealing chamber (11) for preheating by the pumping pump (42) through the circulating pipeline (43);
s5, taking out the annealed wire rod from the rear furnace door (5).
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