CN113201639A - Device for annealing pipe and using method - Google Patents

Device for annealing pipe and using method Download PDF

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Publication number
CN113201639A
CN113201639A CN202110366681.3A CN202110366681A CN113201639A CN 113201639 A CN113201639 A CN 113201639A CN 202110366681 A CN202110366681 A CN 202110366681A CN 113201639 A CN113201639 A CN 113201639A
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pipe
annealing
temperature
furnace
annealing furnace
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CN113201639B (en
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韩毅
方宜琦
吴虚怀
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Case Furnace Technology Jiangsu Co ltd
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Yanshan University
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    • 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
    • C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
    • C21D9/085—Cooling or quenching
    • 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
    • C21D11/00—Process control or regulation for heat treatments
    • 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
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/02—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working in inert or controlled atmosphere or vacuum
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon

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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 Articles (AREA)

Abstract

The invention provides a device for annealing pipes and a using method thereof, the device comprises a nitrogen heating furnace assembly, an annealing furnace assembly, a fixed guide assembly and pipes, wherein the nitrogen heating furnace is positioned at two sides of an annealing furnace box body, n groups of air pumps and automatic flow control valves are arranged between the nitrogen heating furnace and the annealing furnace box body, the air pumps are connected with the automatic flow control valves through air transmission pipelines, two ends of the air transmission pipelines are respectively connected with the nitrogen heating furnace and the annealing furnace box body, the nitrogen heating furnace, the air pumps, the automatic flow control valves and the annealing furnace box body form n passages, a guide cylinder, a fixed frame and a charging frame are respectively positioned in an inner container of an annealing furnace, the pipes are placed on each layer of the charging frame, each charging frame can be used for placing a plurality of pipes, and two temperature sensors are installed at the top of each pipe. The annealing temperature is strictly controlled in the annealing process of the pipe, the phenomenon that the local temperature is too high or too low is avoided, the annealing temperature of the pipe is uniformly increased, and the mechanical property of the pipe reaches a better standard.

Description

Device for annealing pipe and using method
Technical Field
The invention relates to the technical field of heat treatment, in particular to a device for annealing a pipe and a using method thereof.
Background
In the process of manufacturing the pipe, taking an aluminum alloy pipe as an example, the aluminum alloy pipe is generally required to be subjected to annealing process treatment, so that residual stress is eliminated, the size is stabilized, deformation and cracks are reduced, and the mechanical property of the aluminum alloy pipe is improved. The annealing treatment modes are mainly divided into induction heating annealing and flame annealing, and the flame annealing causes environmental pollution, consumes energy and generates open fire to cause poor safety. The induction heating annealing can avoid the defects of flame annealing, has the advantages of energy conservation, environmental protection, safety and the like, and has high working efficiency, so the induction heating annealing is widely applied. The mechanical property of the aluminum alloy pipe is closely related to the annealing temperature, and the phenomenon of local temperature overheating of the aluminum alloy pipe is easily caused by overhigh annealing temperature, so that the recrystallization temperature of the aluminum alloy pipe is reached to grow the crystal grains in the aluminum alloy pipe, and the elongation of the finished aluminum alloy pipe is reduced; and the too low annealing temperature can lead to that the residual stress of the aluminum alloy pipe can not be completely eliminated because the time of the heating stage or the heat preservation stage in the annealing process is insufficient, the hardness value is higher, and the subsequent cold working process is adversely affected. Therefore, in order to strictly control the annealing temperature of the pipe during the annealing treatment, it is necessary to develop a temperature-controllable pipe annealing treatment device and method, which can meet the requirement of the mechanical property of the pipe after the annealing treatment, improve the annealing efficiency, and reduce the number of pipes which can not meet the requirement of the mechanical property.
Patent No. CN107164627B discloses an aluminum alloy tube circulation annealing treatment equipment stove, realizes two-way air pump positive and negative work through electrical control circuit, realizes nitrogen gas reuse, the energy saving, but the device can not carry out accurate control to tubular product annealing temperature, can not guarantee the even heating of tubular product in annealing treatment process.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a device for annealing a pipe and a using method thereof, which mainly controls the wind speed of a fan in real time through temperature sensors at two ends of the top of the pipe, reduces the temperature difference of the pipe in the well depth direction in the annealing process, thereby improving the mechanical property of the pipe after annealing and realizing the real-time detection and control of the annealing temperature of the pipe.
The invention provides a device for annealing a pipe, which comprises a computer, a nitrogen heating furnace assembly, an annealing furnace assembly, a fixed guide assembly and a pipe. The nitrogen heating furnace assembly comprises a nitrogen heating furnace, a resistance wire, a nitrogen conveying pipe, a first temperature probe, an air pump, an automatic flow control valve, an exhaust pipeline, an exhaust pump, a nitrogen collecting chamber and an air conveying pipe, wherein the resistance wire is arranged on the inner surface of the nitrogen heating furnace, the nitrogen conveying pipe is arranged on one side of the top of the nitrogen heating furnace, the first temperature probe is arranged at the center of the top of the nitrogen heating furnace, the first end of the air conveying pipe is connected with one side of the nitrogen heating furnace, the second end of the air conveying pipe sequentially penetrates through the air pump and the automatic flow control valve and is connected with one side of an annealing furnace box body, the first end of the exhaust pipeline is connected with one side of the furnace cover, the second end of the exhaust pipeline is connected with the first end of the exhaust pump, and the second end of the exhaust pump is connected with the nitrogen collecting chamber. The annealing furnace assembly comprises an annealing furnace inner container, a second temperature measuring probe, a motor box, a driving motor, a fan, a pressure gauge, a furnace cover and an annealing furnace box body, wherein a resistance wire is arranged on the outer surface of the annealing furnace inner container, the annealing furnace inner container and the resistance wire are respectively located in the annealing furnace box body, the furnace cover is located at the top of the annealing furnace box body, the second temperature measuring probe and the pressure gauge are respectively located on two sides of the center of the furnace cover, the motor box is located at the center of the furnace cover and fixedly connected with the outer surface of the center of the furnace cover, the driving motor is located in the motor box body, and the output end of the driving motor is connected with the fan. The fixed guide assembly comprises a temperature sensor, a motor, an output shaft, a bevel gear, a support plate, a transmission shaft, a chuck, a guide cylinder, a fixed frame and a charging frame, the guide cylinder, the fixed frame and the charging frame are respectively positioned inside the inner container of the annealing furnace, the support plate is positioned at the bottom of the inner surface of the inner container of the annealing furnace, the bottom of the guide cylinder is connected with the first end of the support plate, the first end of the fixed frame is fixedly connected with the outer surface of the guide cylinder, the first end of the charging frame is positioned at the second end of the fixed frame, the pipe is positioned inside the charging frame, the temperature sensors are symmetrically distributed at two sides of the top of the pipe, the output end of the temperature sensor is connected with the computer, and the second end of the charging frame penetrates through the second end of the support plate to be connected with the first end of the chuck, the second end of the chuck is connected with the first end of the transmission shaft, the second end of the transmission shaft is connected with the first end of the bevel gear, the second end of the bevel gear is connected with the first end of the output shaft, and the output end of the motor penetrates through the annealing furnace box body and is connected with the second end of the output shaft.
Preferably, the central line of the inner container of the annealing furnace and the central line of the guide cylinder are on the same straight line, the axis of the fixed frame and the axis of the charging frame are on the same straight line, and the axis of the guide cylinder is parallel to the axis of the fixed frame.
Preferably, the fixing frames are uniformly distributed along the axial direction of the guide cylinder, the fixing frames are symmetrically distributed about the center of the guide cylinder, and the corresponding fixing frames on two sides are in the same plane; the charging frame is evenly divided into n layers along the axial direction.
Preferably, the number of layers of the air pump, the automatic flow control valve and the charging frame is equal to the number of the pipes; 2n passages are formed among the nitrogen heating furnace, the air pump, the automatic flow control valve and the annealing furnace box body.
Preferably, the air pump is positioned at one side close to the nitrogen heating furnace, and the automatic flow control valve is positioned at one side of the annealing furnace; the position of the second end of the gas transmission pipe, which is connected with the box body of the annealing furnace, corresponds to the position of the pipe; and the temperature sensors positioned on two sides of the top of the pipe are respectively close to one side of the guide shell and one side of the annealing furnace box body.
Preferably, the nitrogen heating furnaces are distributed on two sides of the annealing furnace box body, the number of the nitrogen heating furnaces is at least two, and a plurality of charging racks are placed in the annealing furnace box body.
In another aspect of the present invention, a method for annealing a tube is provided, which comprises the following specific steps:
s1, firstly fixing the pipes on a charging frame, arranging two temperature sensors at the top of each pipe, then connecting one end of the charging frame with a chuck positioned in the annealing furnace box body, and finally introducing nitrogen into the nitrogen heating furnace through a nitrogen conveying pipe;
s2, starting a motor, an annealing furnace and a nitrogen heating furnace which are connected with the charging rack, wherein the annealing furnace and the nitrogen heating furnace simultaneously heat the interiors of the annealing furnace and the nitrogen heating furnace, and then starting a fan, wherein the initial speed of the fan is set to be V;
s3, marking a temperature sensor on the pipe: respectively recording the temperatures of two temperature sensors of the uppermost pipe in the heating furnace box body as T11And T12By analogy, the temperature of the temperature sensor on each pipe from the uppermost end to the lowermost end is recorded as T in sequence21，T22…Tn1，Tn2；
S4, adjusting the speed of the fan in real time according to the information transmitted to the computer by the temperature sensor:
s41, comparing the longitudinal temperature of different pipes in the vertical direction:
s411, if the temperature difference T is positioned at the temperature sensors at the two ends of the top of the pipen1-T11Keeping the initial speed V of the fan unchanged at the temperature of less than or equal to 10 ℃;
s412, if the temperature difference of the temperature sensors at the two ends of the top of the pipe is between 10 ℃ and Tn1-T11If the temperature is less than 30 ℃, the initial speed of the fan is increased to 1.2V;
s413, if the temperature difference T is positioned at the temperature sensors at the two ends of the top of the pipen1-T11The initial speed of the fan is increased to 1.5V at the temperature of more than or equal to 30 ℃, and the convection heat transfer is promoted;
s42, comparing the transverse temperature of each pipe in the horizontal direction:
s421, if Tn1-Tn2T of the pipe is less than or equal to 20 DEG Cn2Point rotating to the position where the second end of the gas transmission pipe is connected with the box body of the annealing furnace, and opening the automatic flow control valve to ensure that the nitrogen in the nitrogen heating furnace is at the speed V1Spraying to the pipe;
s422, if T is less than 20 DEG Cn1-Tn2T of the pipe is less than 50 DEG Cn2Rotating the point to the position where the second end of the gas transmission pipe is connected with the box body of the annealing furnace, and adjusting the automatic flow control valve to ensure that the nitrogen in the nitrogen heating furnace is at the speed of 1.2-1.5V1Spraying to the pipe;
s423, if Tn1-Tn2At a temperature of not less than 50 ℃, adjusting the T of the pipen2Point rotating to the position where the second end of the gas transmission pipe is connected with the box body of the annealing furnace, and adjusting the automatic flow control valve to ensure that the nitrogen in the nitrogen heating furnace is at the speed of 2V1Spraying to the pipe;
s5, detecting the temperature of the annealing furnace and the nitrogen heating furnace through a temperature measuring probe:
s51, detecting the temperature T in the annealing furnace through a second temperature probe1Whether the annealing temperature T of the pipe is reached is: if the annealing temperature T of the pipe is not reached, the annealing furnace continues to heat; if the annealing temperature T of the pipe is reached, the annealing furnace stops heating;
s52, detecting the temperature T in the nitrogen heating furnace through a first temperature probe2Whether the annealing temperature T of the pipe is reached is: if the annealing temperature T of the pipe is not reached, the nitrogen heating furnace continues to heat; if the annealing temperature T of the pipe is reached, the nitrogen heating furnace stops heating;
s6, continuously observing the temperature change condition of each pipe in the annealing furnace:
s61, if a certain pipe in the annealing furnace reaches the annealing temperature T, stopping the operation of the air pump and the automatic flow control valve of the corresponding pipe; if a certain pipe in the annealing furnace does not reach the annealing temperature T, repeating the step S4;
s62, stopping introducing nitrogen into the annealing furnace after all the pipes in the annealing furnace reach the annealing temperature T, and closing the fan;
s7, after the annealing furnace is insulated for 20-30 minutes, opening an exhaust pump, and pumping nitrogen in the annealing furnace into a nitrogen collection chamber;
s8, opening a furnace cover of the annealing furnace, sequentially taking out the charging racks filled with the pipes, and cooling the pipes at room temperature.
Preferably, in step S62, the pressure in the annealing furnace is set to P by a pressure gauge on the furnace cover of the annealing furnace, and the standard atmospheric pressure is set to P0If P is not less than 2P0And then the exhaust pump is opened to pump the redundant nitrogen in the annealing furnace.
Compared with the prior art, the invention has the following advantages:
1. according to the temperature fed back to the computer by the temperature sensor, the computer can control the wind speed of the fan in real time, and the temperature difference of the pipe in the well depth direction in the annealing process is reduced.
2. According to the invention, the nitrogen heating furnaces are arranged on two sides of the annealing furnace, nitrogen in the nitrogen heating furnaces is sprayed onto the pipe in the annealing furnace through the air pump and the servo valve, and the temperature sensor, the computer and the automatic flow control valve which are arranged on the pipe form a control system, so that the effective control of the annealing temperature of the pipe is realized, and the transverse temperature difference of the pipe is reduced.
3. The invention can strictly control the annealing temperature in the annealing process of the pipe, avoids the phenomenon of over-high or over-low local temperature, and can well eliminate the residual stress of the pipe so as to ensure that the mechanical property of the pipe reaches a better standard.
Drawings
FIG. 1 is a front view of the overall structure of the apparatus and method of use for annealing tubes of the present invention;
FIG. 2 is a perspective view of the assembly of the draft tube and the charging stand in the apparatus for annealing tubes and the method of using the same according to the present invention;
FIG. 3 is a schematic view of the control method of the device and the method for annealing pipes according to the present invention.
The main reference numbers:
the device comprises a computer 1, a nitrogen heating furnace 2, a resistance wire 3, a nitrogen conveying pipe 4, a first temperature probe 5, an air pump 6, an automatic flow control valve 7, an annealing furnace inner container 8, a temperature sensor 9, a second temperature probe 10, a motor box 11, a driving motor 12, a fan 13, a pressure gauge 14, a furnace cover 15, an exhaust pipeline 16, an exhaust pump 17, a nitrogen collecting chamber 18, a motor 19, an output shaft 20, a bevel gear 21, a supporting plate 22, an annealing furnace box body 23, a transmission shaft 24, a chuck 25, an air conveying pipe 26, a guide cylinder 27, a fixing frame 28, a charging frame 29 and a pipe 30.
Detailed Description
The technical contents, structural features, attained objects and effects of the present invention are explained in detail below with reference to the accompanying drawings.
The device for annealing the pipe and the using method thereof are shown in figure 1 and comprise a computer 1, a nitrogen heating furnace assembly, an annealing furnace assembly, a fixed guide assembly and a pipe 30.
The nitrogen heating furnace component comprises a nitrogen heating furnace 2, a resistance wire 3, a nitrogen conveying pipe 4, a first temperature probe 5, an air pump 6, an automatic flow control valve 7, an exhaust pipeline 16, an exhaust pump 17, a nitrogen collecting chamber 18 and an air conveying pipe 26.
The inner surface of the nitrogen heating furnace 2 is provided with a resistance wire 3, a nitrogen conveying pipe 4 is positioned on one side of the top of the nitrogen heating furnace 2, a first temperature probe 5 is positioned in the center of the top of the nitrogen heating furnace 2, the temperature of nitrogen in the nitrogen heating furnace 2 is fed back by the first temperature probe 5, the first end of a gas conveying pipe 26 is connected with one side of the nitrogen heating furnace 2, the second end of the gas conveying pipe 26 sequentially penetrates through a gas pump 6 and an automatic flow control valve 7 to be connected with one side of an annealing furnace box body 23, and the automatic flow control valve 7 can control the flow speed of the nitrogen; a first end of an exhaust pipe 16 is connected with one side of the furnace cover 15, a second end of the exhaust pipe 16 is connected with a first end of an exhaust pump 17, a second end of the exhaust pump 17 is connected with a nitrogen gas collecting chamber 18, and the exhaust pump 17 can pump the nitrogen gas in the annealing furnace box 23 to the nitrogen gas collecting chamber 18.
The annealing furnace component comprises an annealing furnace inner container 8, a resistance wire 3, a second temperature probe 10, a motor box 11, a driving motor 12, a fan 13, a pressure gauge 14, a furnace cover 15 and an annealing furnace box body 23; the second temperature probe 10 feeds back the temperature in the annealing furnace box body 23 in real time, and the pressure gauge 14 displays the pressure in the annealing furnace box body 23. The surface of annealing stove inner bag 8 is equipped with resistance wire 3, resistance wire 3 gives the inside heating of annealing stove, annealing stove inner bag 8 and resistance wire 4 are located the inside of annealing stove box 23 respectively, bell 15 is located the top of annealing stove box 23, second temperature probe 10 and manometer 14 are located the both sides at bell 15 center respectively, motor case 11 is located the center of bell 15, and with the outer fixed surface connection at bell 15 center, driving motor 12 is located the inside of motor case 11, driving motor 12's output and fan 13 are connected.
And the fixed guide assembly comprises a temperature sensor 9, a motor 19, an output shaft 20, a bevel gear 21, a supporting plate 22, a transmission shaft 24, a chuck 25, a guide cylinder 27, a fixed frame 28 and a charging frame 29. The guide cylinder 27, the fixing frame 28 and the charging frame 29 are respectively positioned inside the inner container 8 of the annealing furnace, the guide cylinder 27 is positioned in the middle of the inner surface of the inner container 8 of the annealing furnace, the supporting plate 22 is positioned at the bottom of the inner surface of the inner container 8 of the annealing furnace, as shown in fig. 2, the bottom of the guide cylinder 27 is connected with the first end of the supporting plate 22, the first end of the fixing frame 28 is fixedly connected with the outer surface of the guide cylinder 27, the second end of the fixing frame 28 is in a cantilever state, the first end of the charging frame 29 is positioned at the second end of the fixing frame 28, the pipe 30 is positioned inside the charging frame 29, and the fixing frame 28 plays a role in circumferentially positioning the pipe 30 on the charging frame 29.
Two temperature sensors 9 are uniformly arranged on each pipe 30 along the circumferential direction, the temperature sensors 9 are in communication connection with the computer 1, the temperature of the pipe 30 is fed back in real time, the second end of the charging frame 29 penetrates through the second end of the supporting plate 22 to be connected with the first end of the chuck 25, the second end of the chuck 25 is connected with the first end of the transmission shaft 24, the second end of the transmission shaft 24 is connected with the first end of the bevel gear 21, the second end of the bevel gear 21 is connected with the first end of the output shaft 20, the output end of the motor 19 penetrates through the annealing furnace box body 23 to be connected with the second end of the output shaft 20, the motor 19 drives the bevel gear 21 to work, the charging frame 29 arranged on the chuck 25 is driven to rotate.
As shown in FIG. 2, the center line of the inner vessel 8 of the annealing furnace and the center line of the guide cylinder 27 are on the same straight line, the axis of the fixing frame 28 and the axis of the charging frame 29 are on the same straight line, and the axis of the guide cylinder 27 and the axis of the fixing frame 28 are parallel.
As shown in fig. 2, the fixing frames 28 are uniformly distributed along the axial direction of the guide shell 27, the fixing frames 28 are symmetrically distributed about the center of the guide shell 27, and the fixing frames 28 corresponding to both sides are in the same plane; the charging stand 29 is evenly divided into n layers in the axial direction.
The number of layers of the air pump 6, the automatic flow control valve 7 and the charging frame 29 is equal to the number of the pipes 30; 2n passages are formed among the nitrogen heating furnace 2, the air pump 6, the automatic flow control valve 7 and the annealing furnace box body 23.
The air pump 6 is positioned at one side close to the nitrogen heating furnace 2, and the automatic flow control valve 7 is positioned at one side of the annealing furnace; the position of the second end of the gas pipe 26, which is connected with the annealing furnace box body 23, corresponds to the position of the pipe 30, so that nitrogen is ensured to be sprayed onto the pipe 30; the temperature sensors 9 positioned at the two sides of the top of the pipe 30 are respectively close to one side of the guide shell 27 and one side of the annealing furnace box 23.
The nitrogen heating furnaces 2 are distributed on two sides of the annealing furnace box body 23, the number of the nitrogen heating furnaces 2 is at least two, and a plurality of charging racks 29 are arranged in the annealing furnace box body 23.
The use method for annealing the pipe is realized by the following steps as shown in figure 3:
s1, the pipes 30 are first fixed to the charging stand 29 while two temperature sensors 9 are disposed on the top of each pipe 30, then one end of the charging stand 29 is connected to the chuck 25 inside the annealing furnace casing 23, and finally nitrogen gas is introduced into the nitrogen gas heating furnace 2 through the nitrogen gas feed pipe 4.
S2, the motor 19 connected to the charging stand 29, the annealing furnace and the nitrogen heating furnace 2 are turned on, the annealing furnace and the nitrogen heating furnace 2 simultaneously heat the respective interiors, and then the fan 13 is turned on, setting the initial speed of the fan 13 to V.
S3, marking the temperature sensor 9 on the pipe 30: the temperatures of two temperature sensors 9 of the uppermost pipe 30 in the heating furnace box 23 are respectively recorded as T11And T12By analogy, the temperature of the temperature sensor 9 on each pipe 30 from the uppermost end to the lowermost end is sequentially marked as T21，T22…Tn1，Tn2。
S4, adjusting the speed of the fan 13 in real time according to the information transmitted to the computer 1 by the temperature sensor 9:
s41, comparing the longitudinal temperature of the different tubes 30 in the vertical direction:
s411, if the temperature difference T of the temperature sensors 9 is positioned at the two ends of the top of the pipe 30n1-T11Keeping the initial speed V of the fan 13 unchanged at the temperature of less than or equal to 10 ℃.
S412, if the temperature difference of the temperature sensors 9 at the two ends of the top of the pipe 30 is between 10 ℃ and Tn1-T11If the temperature is less than 30 ℃, the initial speed of the fan 13 is increased to 1.2V.
S413, the temperature difference T of the temperature sensors 9 at the two ends of the top of the pipe 30n1-T11And the temperature is more than or equal to 30 ℃, the initial speed of the fan 13 is increased to 1.5V, and the convection heat transfer is promoted.
S42, comparing the transverse temperature of each tube 30 in the horizontal direction:
s421, if Tn1-Tn2T of the pipe 30 is less than or equal to 20 DEG Cn2The point is rotated to the position where the second end of the gas transmission pipe 26 is connected with the annealing furnace box body 23, the automatic flow control valve 7 is opened, so that the nitrogen in the nitrogen heating furnace 2 is at the speed V1Is sprayed onto the tubing 30.
S422, if T is less than 20 DEG Cn1-Tn2T of the pipe 30 is less than 50 DEG Cn2The point is rotated to the position where the second end of the gas transmission pipe 26 is connected with the annealing furnace box body 23, and the automatic flow control valve 7 is adjusted to ensure that the nitrogen in the nitrogen heating furnace 2 is at the speed of 1.2-1.5V1Is sprayed onto the tubing 30.
S423, if Tn1-Tn2At a temperature of not less than 50 ℃, the T of the pipe 30 is adjustedn2The point is rotated to the position where the second end of the gas transmission pipe 26 is connected with the annealing furnace box body 23, and the automatic flow control valve 7 is adjusted to ensure that the nitrogen in the nitrogen heating furnace 2 is at the speed of 2V1Is sprayed onto the tubing 30.
S5, detecting the temperature of the annealing furnace and the nitrogen heating furnace 2 through a temperature measuring probe:
s51, detecting the temperature T in the annealing furnace through the second temperature probe 101Whether the annealing temperature T of the tube 30 is reached: if the annealing temperature T of the pipe 30 is not reached, the annealing furnace continues to heat; if the annealing temperature of the pipe 30 is reachedAnd C, stopping heating of the annealing furnace.
S52, detecting the temperature T in the nitrogen heating furnace 2 through the first temperature probe 52Whether the annealing temperature T of the tube 30 is reached: if the annealing temperature T of the pipe 30 is not reached, the nitrogen heating furnace 2 continues to heat; when the annealing temperature T of the pipe 30 is reached, the nitrogen heating furnace 2 stops heating.
S6, continuously observing the temperature change condition of each pipe 30 in the annealing furnace:
s61, if the temperature of a certain pipe 30 in the annealing furnace reaches the annealing temperature T, stopping the air pump 6 and the automatic flow control valve 7 of the corresponding pipe 30; if a certain pipe 30 located in the annealing furnace does not reach the annealing temperature T, the step S4 is repeated.
And S62, stopping introducing the nitrogen into the annealing furnace after the temperature of all the pipes 30 in the annealing furnace reaches the annealing temperature T, and closing the fan 13.
S7, after the annealing furnace is kept warm for 20-30 minutes, the exhaust pump 17 is opened, and nitrogen in the annealing furnace is pumped into the nitrogen collection chamber 18.
S8, opening the furnace cover 15 of the annealing furnace, taking out the charging rack 29 with the pipe 30 in sequence, and cooling the pipe 30 at room temperature.
Setting the pressure in the annealing furnace as P and the standard atmospheric pressure as P on a pressure gauge on a furnace cover 15 of the annealing furnace0If P is not less than 2P0Then, the exhaust pump 17 is turned on to pump the excess nitrogen gas in the annealing furnace.
The following describes a device and a method for annealing a tube according to the present invention with reference to the following embodiments:
in this embodiment, a device for annealing of tubular product, constitute by an annealing stove and two nitrogen heating furnace 2, draft tube 27 that is arranged in annealing stove inner bag 8 has evenly distributed three fixed frame 28 of group along self axial, the quantity of every fixed frame 28 of group is two, two fixed frame 28 evenly distributed in same horizontal plane, can place two charging racks 29 in the annealing stove box 23, charging rack 29 has evenly distributed the three-layer along self axial, three aluminum alloy pipe can be placed to every charging rack 29 of bilateral symmetry arrangement, the quantity of aluminum alloy pipe is six, nitrogen heating furnace 2 symmetry is installed in the both sides of annealing stove box 23, set up three air pump 6 of group and automatic flow control valve 7 between every nitrogen heating furnace 2 and the annealing stove box 23, form six routes altogether.
The structure of the annealing furnace box body 23 is symmetrical, and the heating temperatures of the aluminum alloy pipes at the symmetrical positions are approximately equal; the annealing temperature of the aluminum alloy pipe is 320-350 ℃, and the annealing temperature of the aluminum alloy pipe is 350 ℃ preferably.
S1, fixing the aluminum alloy pipes on the charging stand 29 while arranging two temperature sensors 9 on the top of each aluminum alloy pipe, connecting one end of the charging stand 29 to the chuck 25 inside the annealing furnace body 23, and introducing nitrogen gas into the nitrogen heating furnace 2 through the nitrogen gas supply pipe 4.
S2, the motor 19 connected to the charging stand 29, the annealing furnace, and the nitrogen heating furnace 2 are turned on, the charging stand 29 starts to rotate, the annealing furnace and the nitrogen heating furnace 2 simultaneously heat the respective interiors, and then the fan 13 is turned on, setting the initial speed of the fan 13 to V.
S3, marking the temperature sensors 9 on the six aluminum alloy pipes in the annealing furnace box body 23: from left to right, the marking is carried out from top to bottom in sequence, the marking is carried out at the left end, the temperatures of two temperature sensors 9 of the aluminum alloy pipe at the uppermost end in the heating furnace box body 23 are respectively marked as T11And T12By analogy, the temperature of the temperature sensor 9 on each aluminum alloy pipe from the uppermost end to the lowermost end is sequentially marked as T21，T22，T31，T32(ii) a Then, the right end is marked, and the temperatures of two temperature sensors 9 of the uppermost aluminum alloy tube in the heating furnace casing 23 are respectively marked as T41And T42By analogy, the temperature of the temperature sensor 9 on each aluminum alloy pipe from the uppermost end to the lowermost end is sequentially marked as T51，T52，T61，T62。
S4, adjusting the speed of the fan 13 in real time according to the information transmitted to the computer 1 by the temperature sensor 9:
s41, comparing the longitudinal temperature of different aluminum alloy pipes in the vertical direction:
s411, ifTemperature difference T of temperature sensors 9 positioned at two ends of top of aluminum alloy pipen1-T11Keeping the initial speed V of the fan 13 unchanged at the temperature of less than or equal to 10 ℃.
S412, if the temperature difference of the temperature sensors 9 at the two ends of the top of the aluminum alloy pipe is between 10 ℃ and Tn1-T11If the temperature is less than 30 ℃, the initial speed of the fan 13 is increased to 1.2V.
S413, the temperature difference T of the temperature sensors 9 at the two ends of the top of the aluminum alloy pipen1-T11And the temperature is more than or equal to 30 ℃, the initial speed of the fan 13 is increased to 1.5V, and the convection heat transfer is promoted.
S42, comparing the transverse temperature of each aluminum alloy pipe in the horizontal direction:
s421, if Tn1-Tn2T of the aluminum alloy pipe is less than or equal to 20 DEG Cn2The point is rotated to the position where the second end of the gas transmission pipe 26 is connected with the annealing furnace box body 23, the automatic flow control valve 7 is opened, so that the nitrogen in the nitrogen heating furnace 2 is at the speed V1Spraying the aluminum alloy pipe.
S422, if T is less than 20 DEG Cn1-Tn2T of the aluminum alloy pipe is less than 50 DEG Cn2The point is rotated to the position where the second end of the gas transmission pipe 26 is connected with the annealing furnace box body 23, and the automatic flow control valve 7 is adjusted to ensure that the nitrogen in the nitrogen heating furnace 2 is at the speed of 1.5V1Spraying the aluminum alloy pipe.
S423, if Tn1-Tn2More than or equal to 50 ℃, the T of the aluminum alloy pipe is adjustedn2The point is rotated to the position where the second end of the gas transmission pipe 26 is connected with the annealing furnace box body 23, and the automatic flow control valve 7 is adjusted to ensure that the nitrogen in the nitrogen heating furnace 2 is at the speed of 2V1Spraying the aluminum alloy pipe.
S5, detecting the temperature of the annealing furnace and the nitrogen heating furnace 2 through a temperature measuring probe:
s51, detecting the temperature T in the annealing furnace through the second temperature probe 101Whether the annealing temperature of the aluminum alloy pipe is 350 ℃ is achieved: if the annealing temperature of the aluminum alloy pipe is not up to 350 ℃, the annealing furnace continues to heat; and if the annealing temperature of the aluminum alloy pipe reaches 350 ℃, stopping heating of the annealing furnace.
S52, detecting nitrogen heating through the first temperature probe 5Temperature T in furnace 22Whether the annealing temperature of the aluminum alloy pipe is 350 ℃ is achieved: if the annealing temperature of the aluminum alloy pipe is not up to 350 ℃, the nitrogen heating furnace 2 continues to heat; when the annealing temperature of the aluminum alloy tube reaches 350 ℃, the heating of the nitrogen heating furnace 2 is stopped.
S6, continuously observing the temperature change condition of each aluminum alloy pipe in the annealing furnace:
s61, if the temperature of a certain aluminum alloy pipe in the annealing furnace reaches the annealing temperature of 350 ℃, stopping the air pump 6 and the automatic flow control valve 7 of the corresponding aluminum alloy pipe; if a certain aluminum alloy pipe in the annealing furnace does not reach the annealing temperature of 350 ℃, the step S4 is repeated, and after the annealing temperature of 350 ℃, nitrogen is not introduced into the box body 23 of the annealing furnace.
And S62, stopping introducing nitrogen into the annealing furnace after the temperature of all the aluminum alloy pipes in the annealing furnace reaches the annealing temperature of 350 ℃, and closing the fan 13.
S7, after the annealing furnace is kept warm for 20-30 minutes, the exhaust pump 17 is opened, and nitrogen in the annealing furnace is pumped into the nitrogen collection chamber 18.
S8, opening the furnace cover 15 of the annealing furnace, taking out the charging rack 29 with the aluminum alloy pipes in sequence, and cooling the aluminum alloy pipes at room temperature.
The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements made to the technical solution of the present invention by those skilled in the art without departing from the spirit of the present invention shall fall within the protection scope defined by the claims of the present invention.

Claims (8)

1. A device for annealing pipes comprises a computer, a nitrogen heating furnace component, an annealing furnace component, a fixed guide component and pipes,
the nitrogen heating furnace assembly comprises a nitrogen heating furnace, a resistance wire, a nitrogen conveying pipe, a first temperature measuring probe, an air pump, an automatic flow control valve, an exhaust pipeline, an exhaust pump, a nitrogen collecting chamber and an air conveying pipe, wherein the resistance wire is arranged on the inner surface of the nitrogen heating furnace, the nitrogen conveying pipe is positioned on one side of the top of the nitrogen heating furnace, the first temperature measuring probe is positioned in the center of the top of the nitrogen heating furnace, the first end of the air conveying pipe is connected with one side of the nitrogen heating furnace, the second end of the air conveying pipe sequentially penetrates through the air pump and the automatic flow control valve to be connected with one side of an annealing furnace box body, the first end of the exhaust pipeline is connected with one side of the furnace cover, the second end of the exhaust pipeline is connected with the first end of the exhaust pump, and the second end of the exhaust pump is connected with the nitrogen collecting chamber;
the annealing furnace assembly comprises an annealing furnace inner container, a second temperature measuring probe, a motor box, a driving motor, a fan, a pressure gauge, a furnace cover and an annealing furnace box body, wherein a resistance wire is arranged on the outer surface of the annealing furnace inner container, the annealing furnace inner container and the resistance wire are respectively positioned in the annealing furnace box body, the furnace cover is positioned at the top of the annealing furnace box body, the second temperature measuring probe and the pressure gauge are respectively positioned on two sides of the center of the furnace cover, the motor box is positioned in the center of the furnace cover and is fixedly connected with the outer surface of the center of the furnace cover, the driving motor is positioned in the motor box, and the output end of the driving motor is connected with the fan;
the fixed guide assembly comprises a temperature sensor, a motor, an output shaft, a bevel gear, a support plate, a transmission shaft, a chuck, a guide cylinder, a fixed frame and a charging frame, the guide cylinder, the fixed frame and the charging frame are respectively positioned inside the inner container of the annealing furnace, the support plate is positioned at the bottom of the inner surface of the inner container of the annealing furnace, the bottom of the guide cylinder is connected with the first end of the support plate, the first end of the fixed frame is fixedly connected with the outer surface of the guide cylinder, the first end of the charging frame is positioned at the second end of the fixed frame, the pipe is positioned inside the charging frame, the temperature sensors are symmetrically distributed at two sides of the top of the pipe, the output end of the temperature sensor is connected with the computer, and the second end of the charging frame penetrates through the second end of the support plate to be connected with the first end of the chuck, the second end of the chuck is connected with the first end of the transmission shaft, the second end of the transmission shaft is connected with the first end of the bevel gear, the second end of the bevel gear is connected with the first end of the output shaft, and the output end of the motor penetrates through the annealing furnace box body and is connected with the second end of the output shaft.
2. The device for pipe annealing according to claim 1, wherein the center line of the inner container of the annealing furnace and the center line of the guide cylinder are on the same straight line, the axis of the fixed frame and the axis of the charging frame are on the same straight line, and the axis of the guide cylinder and the axis of the fixed frame are parallel.
3. The apparatus for pipe annealing according to claim 1, wherein the fixing frames are uniformly distributed along an axial direction of the guide shell, the fixing frames are symmetrically distributed about a center of the guide shell, and the fixing frames corresponding to two sides are in the same plane; the charging frame is evenly divided into n layers along the axial direction.
4. The apparatus for pipe annealing according to claim 1 or 3, wherein the number of layers of said air pump, said automatic flow control valve, said charging stand and the number of said pipes are equal; 2n passages are formed among the nitrogen heating furnace, the air pump, the automatic flow control valve and the annealing furnace box body.
5. The apparatus according to claim 1, wherein the gas pump is located at one side close to the nitrogen heating furnace, and the automatic flow control valve is located at one side of the annealing furnace; the position of the second end of the gas transmission pipe, which is connected with the box body of the annealing furnace, corresponds to the position of the pipe; and the temperature sensors positioned on two sides of the top of the pipe are respectively close to one side of the guide shell and one side of the annealing furnace box body.
6. The apparatus according to claim 1, wherein the nitrogen heating furnaces are distributed on both sides of the annealing furnace box, the number of the nitrogen heating furnaces is at least two, and a plurality of charging racks are arranged in the annealing furnace box.
7. Use of a method according to claims 1-6 for annealing tubes, characterized in that it comprises the following steps:
s1, firstly fixing the pipes on a charging frame, arranging two temperature sensors at the top of each pipe, then connecting one end of the charging frame with a chuck positioned in the annealing furnace box body, and finally introducing nitrogen into the nitrogen heating furnace through a nitrogen conveying pipe;
s2, starting a motor, an annealing furnace and a nitrogen heating furnace which are connected with the charging rack, wherein the annealing furnace and the nitrogen heating furnace simultaneously heat the interiors of the annealing furnace and the nitrogen heating furnace, and then starting a fan, wherein the initial speed of the fan is set to be V;
s3, marking a temperature sensor on the pipe: respectively recording the temperatures of two temperature sensors of the uppermost pipe in the heating furnace box body as T11And T12By analogy, the temperature of the temperature sensor on each pipe from the uppermost end to the lowermost end is recorded as T in sequence21，T22…Tn1，Tn2；
S4, adjusting the speed of the fan in real time according to the information transmitted to the computer by the temperature sensor:
s41, comparing the longitudinal temperature of different pipes in the vertical direction:
s411, if the temperature difference T is positioned at the temperature sensors at the two ends of the top of the pipen1-T11Keeping the initial speed V of the fan unchanged at the temperature of less than or equal to 10 ℃;
s412, if the temperature difference of the temperature sensors at the two ends of the top of the pipe is between 10 ℃ and Tn1-T11If the temperature is less than 30 ℃, the initial speed of the fan is increased to 1.2V;
s413, if the temperature difference T is positioned at the temperature sensors at the two ends of the top of the pipen1-T11The initial speed of the fan is increased to 1.5V at the temperature of more than or equal to 30 ℃, and the convection heat transfer is promoted;
s42, comparing the transverse temperature of each pipe in the horizontal direction:
s421, if Tn1-Tn2T of the pipe is less than or equal to 20 DEG Cn2Point rotating to the position where the second end of the gas transmission pipe is connected with the box body of the annealing furnace, and opening the automatic flow control valve to ensure that the nitrogen in the nitrogen heating furnace is at the speed V1Spraying to the pipe;
s422, if T is less than 20 DEG Cn1-Tn2T of the pipe is less than 50 DEG Cn2Rotating the point to the position where the second end of the gas transmission pipe is connected with the box body of the annealing furnace, and adjusting the automatic flow control valve to ensure that the nitrogen in the nitrogen heating furnace is at the speed of 1.2-1.5V1Spraying to the pipe;
s423, if Tn1-Tn2At a temperature of not less than 50 ℃, adjusting the T of the pipen2Point rotating to the position where the second end of the gas transmission pipe is connected with the box body of the annealing furnace, and adjusting the automatic flow control valve to ensure that the nitrogen in the nitrogen heating furnace is at the speed of 2V1Spraying to the pipe;
s5, detecting the temperature of the annealing furnace and the nitrogen heating furnace through a temperature measuring probe:
s51, detecting the temperature T in the annealing furnace through a second temperature probe1Whether the annealing temperature T of the pipe is reached is: if the annealing temperature T of the pipe is not reached, the annealing furnace continues to heat; if the annealing temperature T of the pipe is reached, the annealing furnace stops heating;
s52, detecting the temperature T in the nitrogen heating furnace through a first temperature probe2Whether the annealing temperature T of the pipe is reached is: if the annealing temperature T of the pipe is not reached, the nitrogen heating furnace continues to heat; if the annealing temperature T of the pipe is reached, the nitrogen heating furnace stops heating;
s6, continuously observing the temperature change condition of each pipe in the annealing furnace:
s61, if a certain pipe in the annealing furnace reaches the annealing temperature T, stopping the operation of the air pump and the automatic flow control valve of the corresponding pipe; if a certain pipe in the annealing furnace does not reach the annealing temperature T, repeating the step S4;
s62, stopping introducing nitrogen into the annealing furnace after all the pipes in the annealing furnace reach the annealing temperature T, and closing the fan;
s7, after the annealing furnace is insulated for 20-30 minutes, opening an exhaust pump, and pumping nitrogen in the annealing furnace into a nitrogen collection chamber;
s8, opening a furnace cover of the annealing furnace, sequentially taking out the charging racks filled with the pipes, and cooling the pipes at room temperature.
8. The use method for annealing pipes according to claim 7, wherein in step S62, the pressure in the annealing furnace is set to P by a pressure gauge on the furnace cover of the annealing furnace, and the standard atmospheric pressure is set to P0If P is not less than 2P0And then the exhaust pump is opened to pump the redundant nitrogen in the annealing furnace.
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