CN113462881A - High-temperature annealing annular furnace and high-temperature annealing method - Google Patents
High-temperature annealing annular furnace and high-temperature annealing method Download PDFInfo
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- CN113462881A CN113462881A CN202110891511.7A CN202110891511A CN113462881A CN 113462881 A CN113462881 A CN 113462881A CN 202110891511 A CN202110891511 A CN 202110891511A CN 113462881 A CN113462881 A CN 113462881A
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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
- C21D9/52—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
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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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
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Abstract
The invention discloses a high-temperature annealing annular furnace and a high-temperature annealing method, wherein the high-temperature annealing annular furnace comprises: the annular furnace bottom is circumferentially and alternately distributed with a plurality of workpieces; the annular furnace body covers the annular furnace bottom and is in sliding connection with the annular furnace bottom along the circumferential direction, a furnace chamber is arranged in the annular furnace body, a gap is formed in the annular furnace body, and a material loading and unloading area is arranged at the gap; the rotating mechanism is used for driving the annular furnace bottom to rotate; and the temperature control mechanism is used for respectively adjusting the temperature of a plurality of positions of the furnace chamber so that a plurality of processing areas corresponding to the temperature requirements of a plurality of procedures of high-temperature annealing of the workpiece are sequentially formed in the furnace chamber along the circumferential direction. According to the high-temperature annealing annular furnace, manual workpiece transfer is not needed among a plurality of working procedures, the whole high-temperature annealing process is automatically completed in the furnace chamber, and batch production of the high-temperature annealed workpieces is realized.
Description
Technical Field
The invention belongs to the technical field of high-temperature annealing furnaces, and particularly relates to a high-temperature annealing annular furnace and a high-temperature annealing method.
Background
The oriented silicon steel is mainly used for transformers, and the silicon steel coil is subjected to primary heating, primary heat preservation, secondary heating, secondary heat preservation and cooling, so that the final high-temperature annealing of the oriented silicon steel is completed. The main functions of high-temperature annealing are as follows: 1) forming a single tissue structure through secondary recrystallization; 2) by MgO and SiO in the surface oxide film2Chemically react to form Mg2SiO4A bottom layer; 3) removing impurities such as sulfur, nitrogen and the like in the steel.
The existing high-temperature annealing of the oriented silicon steel basically adopts a bell-type furnace, the bell-type furnace is a periodic heat treatment furnace, and the structure and the production process are very complicated. The bell-type furnace divide into warm table, cooling table, heating mantle and cooling mantle, and in process of production, the coil of strip is at first placed on the warm table, then buckles the heating mantle, heats and keeps warm to the coil of strip, tears down the heating mantle after the heating is accomplished, places the coil of strip again on the cooling table, buckles the cooling of accomplishing the coil of strip behind the cooling mantle. Because each coil of strip all need independently heat and cool off, and still need move to the cooling bench from the heating station, easily receive the interference of human factor, the annealing quality of every coil of strip can have the difference. In addition, the steel coil needs to be moved from the heating table to the cooling table in the production process, a large number of technological processes of manually uncovering and hoisting the steel coil exist, operation and maintenance are inconvenient, and the automation level degree is not high.
Disclosure of Invention
The invention aims to provide a high-temperature annealing annular furnace and a high-temperature annealing method, and aims to solve the technical problems that silicon steel coils need to be assembled and disassembled repeatedly when the oriented silicon steel adopts multiple working procedures of high-temperature annealing of the conventional high-temperature annealing furnace, and batch production cannot be realized.
The above object of the present invention can be achieved by the following technical solutions:
the invention provides a high-temperature annealing annular furnace, which comprises: the annular furnace bottom is circumferentially and alternately distributed with a plurality of workpieces; the annular furnace body covers the annular furnace bottom and is in sliding connection with the annular furnace bottom along the circumferential direction, a furnace chamber is arranged in the annular furnace body, a gap is formed in the annular furnace body, and a material loading and unloading area is arranged at the gap; the rotating mechanism is used for driving the annular furnace bottom to rotate; and the temperature control mechanism is used for respectively adjusting the temperature of a plurality of positions of the furnace chamber so that a plurality of processing areas corresponding to the temperature requirements of a plurality of procedures of high-temperature annealing of the workpiece are sequentially formed in the furnace chamber along the circumferential direction.
In an embodiment of the present invention, a circumferential length of each of the machining regions is equal to a circumferential length of the annular hearth which rotates at a time required for the corresponding process.
In an embodiment of the present invention, the plurality of processing regions includes a preheating region, a heating region, and a cooling region arranged in this order in the circumferential direction.
In an embodiment of the present invention, the heating zone includes a first heat preservation zone, a heating zone, a second heat preservation zone, and a first cooling zone sequentially arranged along a circumferential direction; the cooling zone comprises a second cooling zone and a third cooling zone which are sequentially distributed along the circumferential direction, and the loading and unloading zone is positioned between the preheating zone and the third cooling zone.
In an embodiment of the present invention, the ratio of the circumferential lengths of the preheating zone, the first heat-retaining zone, the warming-up zone, the second heat-retaining zone, the first cooling zone, the second cooling zone, and the third cooling zone, and the ratio of the time required for seven processes corresponding to the preheating zone, the first heat-retaining zone, the warming-up zone, the second heat-retaining zone, the first cooling zone, the second cooling zone, and the third cooling zone are all 3: 5: 17: 9: 5: 8: 6.
In an embodiment of the present invention, a first door is disposed at an inlet of the preheating zone, a second door is disposed between the first cooling zone and the second cooling zone, a third door is disposed between the second cooling zone and the third cooling zone, and a fourth door is disposed at an outlet of the third cooling zone.
In an embodiment of the present invention, the temperature control mechanism includes a preheating structure having an output end located in the preheating zone, a heating structure having an output end located in the heating zone, and a cooling structure having an output end located in the cooling zone.
In the embodiment of the invention, a smoke exhaust mechanism is arranged on the annular furnace body and is used for exhausting high-temperature smoke in the annular furnace body; the preheating structure comprises a preheating flue gas pipeline, the input end of the preheating flue gas pipeline is communicated with the smoke exhaust mechanism, and the output end of the preheating flue gas pipeline is communicated with the preheating zone of the annular furnace body.
In an embodiment of the present invention, the output ends of a plurality of the heating structures are arranged along the circumferential direction of the heating area; the heating structure comprises a burner, a gas pipeline and an air pipeline, wherein the burner is arranged on at least one side wall of the annular furnace body and is positioned between two circumferentially adjacent workpieces; the gas pipeline is communicated with the combustor; the air duct is in communication with the burner.
In an embodiment of the present invention, the output ends of the plurality of cooling structures are arranged along the circumferential direction of the cooling zone, and the output ends of the cooling structures are located between two circumferentially adjacent workpieces.
In an embodiment of the present invention, the cooling structure includes a side cold air duct and a plurality of top cold air ducts; the side cold air pipeline extends from at least one side wall of the annular furnace body; the top cold air pipeline extends into the annular furnace body from the top wall of the annular furnace body, and a plurality of top pipelines are arranged in a row along the radial direction of the annular furnace body.
In the embodiment of the invention, a refractory fiber light structure is laid on the inner wall surface of the annular furnace body; the light-duty structure of fire-resistant fiber includes aluminium silicate fire-resistant fiber module and the aluminium silicate fire-resistant fiber blanket of range upon range of laying, aluminium silicate fire-resistant fiber blanket is located the cooling zone, aluminium silicate fire-resistant fiber module is located preheating zone and heating zone.
In an embodiment of the invention, a fourth cooling area for natural cooling and air-blast cooling of the workpiece is further provided at the notch.
In the embodiment of the invention, an inner cover and a protective gas pipeline are also arranged on the annular furnace bottom; the annular furnace bottom is provided with an annular groove matched with a cover opening of the inner cover, a sand layer is filled in the annular groove, the inner cover is inserted in the sand layer, and the single workpiece on the annular furnace bottom is covered; the protective gas pipe extends from the annular furnace bottom into the inner cover and is used for supplying or discharging protective gas into the inner cover.
In an embodiment of the invention, the annular furnace bottom is provided with a workpiece support device.
In an embodiment of the present invention, the rotating mechanism includes an endless slide rail, a roller, a trolley, and a rotational drive assembly; the annular slide rail is fixed on a concrete foundation, and the roller is arranged at the bottom of the trolley; or the roller is arranged on a concrete foundation, and the annular slide rail is fixed at the bottom of the trolley; the roller is connected with the annular sliding rail in a sliding manner; the annular furnace bottom is arranged on the trolley, and the movable end of the rotary driving assembly is connected with the trolley and used for driving the trolley to rotate.
In an embodiment of the invention, the annular furnace body is supported and fixed by a steel structure fixed on a concrete foundation.
The invention also provides a high-temperature annealing method, which adopts the high-temperature annealing annular furnace and comprises the following steps: according to the process requirement of the high-temperature annealing of the workpiece, controlling the temperature control mechanism to heat and/or cool a plurality of positions of the furnace chamber, so that a plurality of processing areas corresponding to the temperature requirements of a plurality of procedures of the high-temperature annealing of the workpiece are sequentially formed in the circumferential direction of the furnace chamber; the stay time of the workpiece in each machining area conforms to the time requirement of each corresponding process; the workpiece on the annular furnace bottom is driven by the rotating mechanism to sequentially rotate to a plurality of machining areas from the material loading and unloading area for machining until the workpiece returns to the material loading and unloading area, so that high-temperature annealing is completed.
In an embodiment of the present invention, the step of ensuring that the time during which the workpiece stays in each of the processing areas meets the time requirement of each corresponding process includes: according to the time requirements of a plurality of procedures of high-temperature annealing of the workpiece and the circumferential length of the furnace chamber, determining the speed of the rotating mechanism driving the annular furnace bottom to rotate and the circumferential length of each corresponding processing area in the furnace chamber, so that the stay time of the workpiece in each processing area meets the time requirements of each corresponding procedure of high-temperature annealing of the workpiece.
In an embodiment of the invention, the rotating mechanism adopts intermittent rotation, and the angle of each rotation is equal to the arrangement angle between two circumferentially adjacent workpieces.
The invention has the characteristics and advantages that:
according to the high-temperature annealing annular furnace, the annular furnace body is covered on the annular furnace bottom, and the temperature of the furnace chamber is regulated through the temperature control mechanism, so that the furnace chamber sequentially forms a plurality of processing areas corresponding to the temperature requirements of a plurality of procedures of high-temperature annealing of workpieces along the circumferential direction; through with annular furnace body and annular stove bottom along circumference sliding connection, thereby rotate through rotary mechanism drive annular stove bottom, simultaneously through placing a plurality of work pieces on the annular stove bottom from loading and unloading district along circumference interval in succession, thereby make a plurality of work pieces on the annular stove bottom enter into the processing that carries out a plurality of processes to a plurality of processing regions in proper order, accomplish high temperature annealing, all need not the manual work between a plurality of processes and carry out the transfer of work piece, whole high temperature annealing process is whole to be accomplished automatically in the furnace chamber, make temperature control more accurate and more stable in the furnace chamber, the uniformity of each work piece high temperature annealing quality has been improved, and the batch production of the work piece of high temperature annealing has been realized.
The high-temperature annealing method adopts the high-temperature annealing annular furnace, controls the temperature control mechanism to heat and/or cool a plurality of positions of the furnace chamber according to the process requirements of the high-temperature annealing process of the workpiece to be subjected to high-temperature annealing, so that the furnace chamber sequentially forms a plurality of processing areas corresponding to the temperature requirements of a plurality of procedures of the high-temperature annealing of the workpiece along the circumferential direction, and the staying time of the workpiece in each processing area is in accordance with the time requirements of each corresponding procedure, thereby being suitable for the high-temperature annealing of the workpieces with different specifications or different types.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a plan view of an annular furnace body and an annular furnace bottom of the high temperature annealing annular furnace of the present invention.
FIG. 2 is a sectional view of the preheating zone of the high temperature annealing ring furnace of the present invention.
FIG. 3 is a cross-sectional view of the heating zone of the high temperature annealing ring furnace of the present invention.
FIG. 4 is a cross-sectional view of the cooling zone of the high temperature annealing ring furnace of the present invention.
FIG. 5 is a plan view of the annular furnace body and the annular furnace bottom of the first embodiment of the high temperature annealing annular furnace of the present invention.
FIG. 6 is a plan view of the annular furnace body and the annular furnace bottom of the second embodiment of the high temperature annealing annular furnace of the present invention.
FIG. 7 is a plan view of the annular furnace body and the annular furnace bottom of the third embodiment of the high temperature annealing annular furnace of the present invention.
In the figure:
1. an annular furnace bottom; 11. material level; 12. a workpiece support device; 13. a workpiece; 2. an annular furnace body; 21. a furnace chamber; 22. a first oven door; 23. a second oven door; 24. a third oven door; 25. a fourth oven door; 26. a refractory fiber light structure; 3. a rotation mechanism; 31. an annular slide rail; 32. a roller; 33. a trolley; 4. a temperature control mechanism; 41. a preheating structure; 411. preheating a flue gas pipeline; 42. a heating structure; 421. a burner; 422. a gas pipeline; 423. an air duct; 43. a cooling structure; 431. a top cold air duct; 432. a side cold air duct; 5. a machining area; 51. a preheating zone; 51', a preheating zone; 52. a heating zone; 521. a first temperature maintenance zone; 521' and a first temperature preservation area; 522. a temperature rising zone; 522', a heating area; 523. a second holding section; 523', a second holding area; 524. a first cooling zone; 524', a first cooling zone; 53. a cooling zone; 531. a second cooling zone; 531', a second cooling zone; 532. a third cooling zone; 532', a third cooling zone; 6. a notch; 6', a notch; 61. a loading and unloading area; 61', a loading and unloading zone; 62. a fourth cooling zone; 62', a fourth cooling zone; 7. an inner cover; 71. an annular groove; 72. a sand layer; 8. a shielding gas conduit; 81. a shielding gas control valve frame; 9. a steel structure; 10. a smoke exhaust mechanism.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Implementation mode one
As shown in FIG. 1, the present invention provides a high temperature annealing ring furnace, comprising: the furnace comprises an annular furnace bottom 1, wherein a plurality of workpieces 13 are arranged on the annular furnace bottom 1 at intervals along the circumferential direction; the annular furnace body 2 covers the annular furnace bottom 1 and is connected with the annular furnace bottom 1 in a sliding mode along the circumferential direction, a furnace chamber 21 is arranged in the annular furnace body 2, a gap 6 is formed in the annular furnace body 2, and a material loading and unloading area 61 is arranged at the gap 6; the rotating mechanism 3 is used for driving the annular furnace bottom 1 to rotate; and the temperature control mechanism 4 is used for respectively adjusting the temperature of a plurality of positions of the furnace chamber 21, so that the furnace chamber 21 sequentially forms a plurality of processing areas 5 corresponding to the temperature requirements of a plurality of procedures of high-temperature annealing of the workpiece 13 along the circumferential direction.
According to the high-temperature annealing annular furnace, the annular furnace body 2 is covered on the annular furnace bottom 1, and the temperature of the furnace chamber 21 is regulated through the temperature control mechanism 4, so that the furnace chamber 21 sequentially forms a plurality of processing areas 5 corresponding to the temperature requirements of a plurality of procedures of high-temperature annealing of a workpiece 13 along the circumferential direction; through with annular furnace body 2 and annular stove bottom 1 along circumference sliding connection, thereby it rotates to drive annular stove bottom 1 through rotary mechanism 3, simultaneously through placing a plurality of work pieces 13 on annular stove bottom 1 from loading and unloading district 61 along circumference interval in succession, thereby make a plurality of work pieces 13 on the annular stove bottom 1 enter into the processing that carries out a plurality of processes to a plurality of processing regions 5 in proper order, accomplish high temperature annealing, all need not the manual work to carry out the transfer of work piece 13 between a plurality of processes, whole high temperature annealing process is whole to be accomplished automatically in furnace chamber 21, make temperature control more accurate and more stable in the furnace chamber 21, the uniformity of each work piece 13 high temperature annealing quality has been improved, and the batch production of the work piece 13 of high temperature annealing has been realized.
Specifically, as shown in fig. 1, the ring furnace body 2 is substantially in an open ring structure with a gap 6, and a loading and unloading area 61 is arranged at the gap 6. Alternatively, as shown in fig. 6, the ring-shaped furnace body 2 is a substantially closed ring-shaped structure, and the top wall and/or the side wall of the ring-shaped furnace body 2 is provided with a notch 6' to form a material loading and unloading area 61.
As shown in fig. 5 and 6, according to one embodiment of the present invention, the circumferential length of each machining zone 5 is equal to the circumferential length of the rotation of the annular hearth 1 at the time required for the corresponding process. Therefore, the time of the workpiece 13 staying in each processing area 5 is ensured to be consistent with the time requirement of the corresponding process, so that the workpiece 13 processed in the previous processing area 5 can enter the next processing area 5, and the rhythm of each processing area 5 is the same.
In the embodiment, firstly, according to the high temperature annealing process of the workpiece 13, the temperature control mechanism 4 is controlled to regulate the temperatures of the multiple positions of the furnace chamber 21, so that the furnace chamber 21 sequentially forms multiple processing regions 5 corresponding to the temperature requirements of the multiple processes of the high temperature annealing of the workpiece 13 along the circumferential direction, and the circumferential length of each processing region 5 is equal to the circumferential length of the annular furnace bottom 1 rotating in the time required by the corresponding process. And then the rotary mechanism 3 drives the annular furnace bottom 1 to rotate, and simultaneously, unprocessed workpieces 13 are continuously and uniformly placed on the annular furnace bottom 1 from the material loading and unloading area 61 one by one at intervals along the circumferential direction, so that the multiple workpieces 13 on the annular furnace bottom 1 are sequentially subjected to corresponding processing procedures in each processing area 5, and finally the multiple workpieces 13 are returned to the material loading and unloading area 61 one by one to be discharged, thereby completing the high-temperature annealing process of the multiple workpieces 13, and realizing the large-batch connection production of the workpieces 13 subjected to high-temperature annealing.
Specifically, the ratio of the circumferential lengths of the machining areas 5 is equal to the ratio of the time required by the corresponding process of each machining area 5, the workpieces 13 are uniformly distributed on the annular furnace bottom 1 at intervals along the circumferential direction, the rotating mechanism 3 controls the annular furnace bottom 1 to rotate at intervals, and the rotating angle of each time is equal to the distribution angle between two circumferentially adjacent workpieces 13. Optionally, the rotating mechanism 3 controls the circular furnace bottom 1 to move at a constant speed.
As shown in fig. 5, according to one embodiment of the present invention, the plurality of processing regions 5 includes a preheating region 51, a heating region 52, and a cooling region 53, which are arranged in this order in the circumferential direction. The preheating zone 51 is used to preheat the workpiece 13. The heating zone 52 is used to rapidly heat up the workpiece 13, or to keep it warm, or to slowly cool it down from a high temperature. The cooling zone 53 is used to cool the workpiece 13.
In this embodiment, the workpiece 13 is oriented silicon steel, and the high-temperature annealing process of the oriented silicon steel includes primary heating, primary heat preservation, secondary heating, secondary heat preservation, and cooling. The heating zone 52 comprises a first heat preservation zone 521, a heating zone 522, a second heat preservation zone 523 and a first cooling zone 524 which are sequentially distributed along the circumferential direction; the cooling zone 53 includes a second cooling zone 531 and a third cooling zone 532 arranged in this order in the circumferential direction, and the material loading and unloading zone 61 is located between the preheating zone 51 and the third cooling zone 532. The workpiece 13 firstly enters the preheating zone 51 to perform a primary heating process, the preheated workpiece 13 enters the first temperature preservation zone 521 to perform a primary heat preservation process, the workpiece 13 after primary heat preservation enters the temperature rising zone 522 to perform a secondary heating process, the workpiece 13 is heated to the annealing temperature in the temperature rising zone 522 and generates secondary recrystallization, the workpiece 13 after secondary heating enters the second heat preservation zone 523 to perform a secondary heat preservation process, the workpiece 13 after secondary heat preservation is very high in temperature, and therefore the workpiece 13 firstly enters the first cooling zone 524, the heating temperature of the first cooling zone 524 is controlled through the temperature control mechanism 4, the workpiece 13 is slowly cooled, then the workpiece 13 after slow cooling is conveyed to the second cooling zone 531 to be further cooled, and then the workpiece 13 after further cooling is conveyed to the third cooling zone 532 to be rapidly cooled.
Specifically, the preheating zone 51 is heated to 1260 ℃, the first temperature-maintaining zone 521 is stabilized at 1260 ℃, the heating zone 522 is heated from 1260 ℃ to 1500 ℃, the second temperature-maintaining zone 523 is stabilized at 1500 ℃, the first cooling zone 524 is cooled from 1500 ℃ to 1260 ℃, the second cooling zone 531 is cooled from 1260 ℃ to 1140 ℃, and the third cooling zone 532 is cooled from 1140 ℃.
According to one embodiment of the present invention, as shown in fig. 5, a fourth cooling area 62 for natural cooling and air-blast cooling of the workpiece 13 is further provided at the notch 6. Alternatively, the fourth cooling zone 62 may be provided in the annular furnace body 2 to form a separate processing zone 5, or may be combined with the third cooling zone 532 to form a processing zone 5.
As shown in fig. 5, in the present embodiment, the ratio of the circumferential lengths of the preheating zone 51, the first heat-retaining zone 521, the warming-up zone 522, the second heat-retaining zone 523, the first cooling zone 524, the second cooling zone 531 and the third cooling zone 532 and the ratio of the time required for seven processes corresponding to the preheating zone 51, the first heat-retaining zone 521, the warming-up zone 522, the second heat-retaining zone 523, the first cooling zone 524, the second cooling zone 531 and the third cooling zone 532 are all 3: 5: 17: 9: 5: 8: 6.
Specifically, the annular furnace bottom 1 is provided with a material level 11 for placing a workpiece 13. The plurality of material levels 11 are arranged in a row at regular intervals in the radial direction. The multiple rows of material positions 11 are uniformly distributed in a circle at intervals along the circumferential direction. In the present embodiment, 2 sites 11 are arranged in a row in the radial direction, and 60 rows of sites 11 are arranged uniformly at intervals in the circumferential direction. The arrangement angle between two adjacent rows of material positions 11 is 6 degrees. Optionally, the number of levels 11 is adjusted according to the size of the workpiece 13. Wherein 53 the discharge position 11 is located in the annular furnace body 2, 3 the discharge position 11 is located in the preheating zone 51, 5 the discharge position 11 is located in the first heat preservation zone 521, 17 the discharge position 11 is located in the warming zone 522, 9 the discharge position 11 is located in the second heat preservation zone 523, 5 the discharge position 11 is located in the first cooling zone 524, 8 the discharge position 11 is located in the second cooling zone 531, 6 the discharge position 11 is located in the third cooling zone 532; a loading and unloading zone 61 with a discharge level 11 at the gap 6 is provided, and a fourth cooling zone 62 with a discharge level 11 at the gap 6 is provided.
The rotary mechanism 3 drives the annular furnace bottom 1 to rotate for 60 times, and the rotating angle is 6 degrees each time. In the initial stage, once the annular furnace bottom 1 rotates, the workpiece 13 at the foremost row in the loading and unloading area 61 is conveyed to the preheating area 51 for preheating, and returns to the loading and unloading area 61 after the high-temperature annealing of the workpiece 13 is finished, and then the continuous production stage is carried out, once the annular furnace bottom 1 rotates, the workpiece 13 at the foremost row in the loading and unloading area 61 is conveyed to the preheating area 51 for preheating, meanwhile, the workpiece 13 at the foremost row in the preheating area 51 is preheated and conveyed to the first temperature preservation area 521 for heat preservation, the workpiece 13 at the foremost row in the first temperature preservation area 521 is heat preserved and conveyed to the temperature rising area 522 for temperature rise, the workpiece 13 at the foremost row in the temperature rising area 522 is heat preserved and conveyed to the second temperature preservation area 523 for heat preservation, the workpiece 13 at the foremost row in the second temperature preservation area 523 is heat preserved, the workpiece 13 at the foremost row in the second temperature preservation area 524 is heat preserved and conveyed to the first cooling area 524 for temperature reduction, the workpiece 13 at the foremost row in the first cooling area 524 is firstly cooled and conveyed to the second cooling area 531 for second cooling, the second cooling of the workpiece 13 at the front row in the second cooling zone 531 is finished and the workpiece is sent to the third cooling zone 532 for the third cooling, the third cooling of the workpiece 13 at the front row in the third cooling zone 532 is finished and sent to the fourth cooling zone 62 for the fourth cooling, and the fourth cooling of the workpiece 13 at the front row in the fourth cooling zone 62 is finished and sent to the material loading and unloading zone 61 for unloading. Therefore, all the processes of high-temperature annealing are completed by rotating the workpiece 13 by one turn along with the annular hearth 1.
In another possible embodiment, as shown in fig. 6, the ring furnace 2 is a substantially closed ring structure, the top wall and/or the side wall of the ring furnace 2 is provided with a gap 6 'to form a loading and unloading area 61, and a loading and unloading door is installed at the gap 6'. When the high-temperature annealing of the workpieces 13 has more processes, the annular furnace chamber 21 cannot form a plurality of processing areas 5 corresponding to all the processes along the circumferential direction, all the processes are sequentially disassembled into a plurality of processes in the previous stage and a plurality of processes in the later stage, the temperature of the furnace chamber 21 is adjusted for the first time by the temperature control mechanism 4, the plurality of processing areas 5 corresponding to the plurality of processes in the previous stage are formed along the circumferential direction, the plurality of workpieces 13 on the annular furnace bottom 1 are driven by the rotating mechanism 3 to sequentially rotate to the plurality of processing areas 5 to complete the processing of the plurality of processes in the previous stage, and then when the workpieces are returned to the loading and unloading area 61, the loading and unloading door is closed without loading and unloading, the temperature of the furnace chamber 21 is adjusted for the second time by the temperature control mechanism 4, the plurality of processing areas 5 corresponding to the plurality of processes in the later stage are formed, and the plurality of workpieces 13 on the annular furnace bottom 1 are driven by the rotating mechanism 3 to sequentially rotate to the plurality of processing areas 5 to complete the processing areas 5 in the plurality of processes in the later stage And finally returned to the material loading and unloading zone 61. Therefore, all the processes of high-temperature annealing are completed by rotating the workpiece 13 with the annular hearth 1 for two weeks.
In still another possible embodiment, as shown in fig. 7, the circumferential length of each processing area 5 is the same, the rotating mechanism 3 is controlled to continue rotating, and simultaneously a batch of workpieces 13 are placed on the annular furnace bottom 1 from the loading and unloading area 61 at intervals along the circumferential direction, when the batch of workpieces 13 sequentially enter the first processing area 5, the rotating mechanism 3 is controlled to stop and rotate according to the time requirement of the corresponding process until the dwell time of the first workpiece 13 in the processing area 5 is consistent with the time requirement of the corresponding process, and then the rotating mechanism 3 is controlled to continue rotating according to the time difference of the dwell time of the first workpiece 13 and the last workpiece 13 in the processing area 5 and the circumferential length of the processing area 5, so that the batch of workpieces 13 sequentially enter the next processing area 5, and each workpiece 13 stays in the previous processing area 5 for the same time, and the steps are repeated until the batch of workpieces 13 completes all the processes, the batch of workpieces 13 returns to the loading and unloading area 61' for unloading, and then the next batch of workpieces 13 are placed on the annular furnace bottom 1 from the loading and unloading area 61 at intervals along the circumferential direction, so that a plurality of workpieces 13 are processed in batches, compared with the embodiment, the processing efficiency is reduced, and the batch production of the workpieces 13 subjected to high-temperature annealing can be realized. Wherein the number of workpieces 13 per batch is less than or equal to the maximum number of workpieces 13 that can be accommodated in one machining region 5.
Specifically, the circumferential angle of the annular furnace body 2 is 280 degrees, 7 fan-shaped processing regions 5 each having a circumferential angle of 40 degrees are formed along the circumferential direction, and the 7 processing regions 5 are a preheating region 51', a first temperature maintaining region 521', an warming region 522', a second temperature maintaining region 523', a first cooling region 524', a second cooling region 531' and a third cooling region 532' in this order. The notch 6 of the annular furnace body 2 forms a loading and unloading zone 61 'adjacent to the preheating zone 51' and a fourth cooling zone 62 'adjacent to the third cooling zone 532', and the circumferential angles of the loading and unloading zone 61 'and the fourth cooling zone 62' are both 40 degrees. The annular furnace bottom 1 is provided with a material level 11 for placing workpieces 13 and a fan-shaped material level area for arranging the material level 11. The circumferential angle of the segment 11 is also 40 degrees. The plurality of material levels 11 are arranged in a row at regular intervals in the radial direction. The 6 rows of material positions 11 are uniformly distributed in the sector material position area at intervals along the circumferential direction. The rotating mechanism 3 rotates 40 degrees each time, so that 6 rows of workpieces 13 on the annular furnace bottom 1 are driven to sequentially rotate to 7 processing areas 5 along the circumferential direction, and the time of the workpieces 13 staying in each processing area 5 is ensured to meet the time requirement of the corresponding procedure by controlling the starting and the pausing of the rotating mechanism 3.
According to one embodiment of the present invention, as shown in fig. 5, a first door 22 is provided at an inlet of the preheating zone 51, a second door 23 is provided between the first cooling zone 524 and the second cooling zone 531, a third door 24 is provided between the second cooling zone 531 and the third cooling zone 532, and a fourth door 25 is provided at an outlet of the third cooling zone 532. The preheating zone 51 is isolated from the outside by the first door 22, and the third cooling zone 532 is isolated from the outside by the fourth door 25 to close the cavity 21 for temperature regulation. Since the temperature difference between the preheating zone 51, the first heat preservation zone 521, the warming zone 522, the second heat preservation zone 523, and the first cooling zone 524 is not large and the temperature change is slow, it is not necessary to provide furnace doors for separation. The temperature difference between the first cooling area 524 and the second cooling area 531, and the temperature difference between the second cooling area 531 are relatively large, and the temperature change speed is fast, so the second oven door 23 and the third oven door 24 are respectively arranged to be separated, so as to prevent the air flow from streaming and affecting the temperature control.
According to one embodiment of the present invention, as shown in fig. 2, 3 and 4, the temperature control mechanism 4 includes a preheating structure 41 having an output end located in a preheating zone 51, a heating structure 42 having an output end located in a heating zone 52, and a cooling structure 43 having an output end located in a cooling zone 53.
As shown in fig. 2, a smoke exhaust mechanism 10 is installed on the annular furnace body 2 and used for exhausting high-temperature smoke in the annular furnace body 2; the preheating structure 41 comprises a preheating flue gas duct 411, the input end of the preheating flue gas duct 411 is communicated with the smoke exhaust mechanism 10, and the output end of the preheating flue gas duct 411 is communicated with the preheating zone 51 of the annular furnace body 2. The high-temperature flue gas exhausted from the annular furnace body 2 is recycled through the preheating structure 41, and the workpiece 13 is preheated by utilizing the heat of the high-temperature flue gas, so that the heat loss of the high-temperature annealing annular furnace is reduced, and the production cost is reduced.
Specifically, the smoke exhaust mechanism 10 includes a smoke exhaust fan and a smoke exhaust duct, an input end of the smoke exhaust fan is communicated with the smoke exhaust port of the annular furnace body 2, an output end of the smoke exhaust fan is communicated with the smoke exhaust duct, and the preheating smoke duct 411 is communicated with the smoke exhaust duct.
As shown in fig. 3, the output ends of the plurality of heating structures 42 are arranged along the circumferential direction of the heating zone 52; the heating structure 42 comprises a burner 421, a gas pipeline 422 and an air pipeline 423, wherein the burner 421 is mounted on at least one side wall of the annular furnace body 2 and is positioned between two circumferentially adjacent workpieces 13; the gas pipeline 422 is communicated with the burner 421; air conduit 423 is in communication with burner 421. By individually adjusting the plurality of heating structures 42, the temperature profile within heating zone 52 is more precisely adjusted. By arranging the burners 421 between two circumferentially adjacent workpieces 13, the condition that the temperature of the workpieces 13 is too high due to the fact that the burners 421 directly spray flames onto the workpieces 13 is avoided, and therefore the heat distribution around the workpieces 13 is more uniform.
Specifically, the burners 421 are mounted on the two side walls of the annular furnace body 2, and at least two burners 421 are distributed along the height direction of the furnace chamber 21 to spray flames towards different height positions, so that the heat is distributed more uniformly. A gas control valve for adjusting the gas flow is arranged on the gas pipeline 422. An air control valve for adjusting the air flow is arranged on the air pipeline 423, and the accurate control of the temperature in the heating area 52 is realized by adjusting the flow of the fuel gas and the air.
As shown in fig. 4, the output ends of the plurality of cooling structures 43 are arranged along the circumferential direction of the cooling zone 53, and the output ends of the cooling structures 43 are located between two workpieces 13 adjacent in the circumferential direction. By adjusting the plurality of cooling structures 43 individually, the temperature distribution within the cooling zone 53 is adjusted more precisely. By arranging the output end of the cooling structure 43 between two adjacent workpieces 13, the cooling medium sprayed out of the output end of the cooling structure 43 is distributed more uniformly around the workpieces 13.
Specifically, the cooling structure 43 includes a side cold air duct 432 and a plurality of top cold air ducts 431; the side cold air pipeline 432 extends from at least one side wall of the annular furnace body 2; the top cold air pipeline 431 extends from the top wall of the annular furnace body 2, and a plurality of top pipelines are arranged in a row along the radial direction of the annular furnace body 2. The cooling structure 43 further comprises a cooling fan, the output end of which communicates with a side cold air duct 432 and a plurality of top cold air ducts 431. The cooling structure 43 cools the workpiece 13 by radiation cooling and direct blowing of cold air.
According to one embodiment of the present invention, as shown in fig. 2, 3 and 4, a refractory fiber lightweight structure 26 is laid on the inner wall surface of the annular furnace body 2; the refractory fiber light structure 26 includes aluminum silicate refractory fiber modules in the cooling zone 53 and stacked aluminum silicate refractory fiber blankets in the preheating zone 51 and the heating zone 52.
Specifically, the top wall surface and the side wall surfaces on both sides in the annular furnace body 2 are respectively paved with a refractory fiber light structure 26, wherein the paving thickness of the alumina silicate refractory fiber module located in the preheating zone 51 is 250mm, the paving thickness of the alumina silicate refractory fiber module located in the first heat preservation zone 521 is 250mm, the paving thickness of the alumina silicate refractory fiber module located in the heating zone 522 is 360mm, the paving thickness of the alumina silicate refractory fiber module located in the second heat preservation zone 523 is 410mm, the paving thickness of the alumina silicate refractory fiber module located in the first cooling zone 524 is 250mm, the paving thickness of the alumina silicate refractory fiber blanket located in the second cooling zone 531 is 150mm, and the paving thickness of the alumina silicate refractory fiber blanket located in the third cooling zone 532 is 50 mm.
According to one embodiment of the invention, as shown in fig. 2, 3 and 4, the annular hearth 1 is further provided with an inner cover 7 and a protective gas duct 8; an annular groove 71 matched with a cover opening of the inner cover 7 is arranged on the annular furnace bottom 1, a sand layer 72 is filled in the annular groove 71, the inner cover 7 is inserted in the sand layer 72, and the single workpiece 13 on the annular furnace bottom 1 is covered; a protective gas line 8 extends from the annular furnace bottom 1 into the inner envelope 7 for supplying or discharging protective gas into the inner envelope 7. Specifically, the protective gas is a mixed gas of hydrogen and nitrogen. In addition, a shielding gas control valve frame 81 is installed on the movable end of the rotary mechanism 3 for installing a shielding gas pipe control valve, so that the shielding gas pipe 8 and the shielding gas control valve frame 81 are rotated in synchronization with the annular furnace bottom 1 to control the shielding gas to be delivered into the inner cover 7. Each work piece 13 is sealed up alone through a plurality of inner covers 7 to seal inner cover 7 through husky layer 72, can avoid the high temperature flue gas that combustor 421 burning produced, preheat flue gas pipeline 411 spun high temperature flue gas and cooling medium contact work piece 13 of cooling structure 43 spun, and heat inner cover 7 earlier, rethread inner cover 7 heats inside work piece 13, protect work piece 13 through the protective gas in the inner cover 7 simultaneously, thereby prevent that work piece 13 from receiving the infringement of external gas in the high temperature annealing process.
According to one embodiment of the invention, as shown in fig. 2, 3 and 4, the annular hearth 1 is provided with a workpiece support means 12. Specifically, the workpiece support device 12 is a support frame fixed on the annular furnace bottom 1. The workpiece 13 is erected in the middle of the annular furnace body 2 through the workpiece supporting device 12, which is beneficial for the medium sprayed by the preheating structure 41, the heating structure 42 and the cooling structure 43 to surround the workpiece 13, so that the workpiece 13 is heated or cooled more uniformly.
According to one embodiment of the present invention, as shown in fig. 2, 3 and 4, the rotating mechanism 3 includes an endless slide rail 31, a roller 32, a trolley 33 and a rotary driving assembly; the annular slide rail 31 is fixed on a concrete foundation, and the roller 32 is arranged at the bottom of the trolley 33; or the roller 32 is arranged on the concrete foundation, and the annular slide rail 31 is fixed at the bottom of the trolley 33; the roller 32 is connected with the annular slide rail 31 in a sliding way; the annular furnace bottom 1 is arranged on a trolley 33, and the movable end of the rotary driving assembly is connected with the trolley 33 and used for driving the trolley 33 to rotate. Specifically, the rotation driving assembly comprises a plurality of hydraulic cylinders circumferentially arranged around the trolley 33, fixed ends of the hydraulic cylinders are fixed on a concrete foundation, and movable ends of the hydraulic cylinders are connected with the trolley 33. Optionally, the rotary drive assembly comprises a rotary drive motor and a transmission for connecting an output shaft of the rotary drive motor to the trolley 33.
According to one embodiment of the invention, the ring furnace body 2 is supported and fixed by steel structures 9 fixed to the concrete foundation, as shown in fig. 2, 3 and 4. The ring furnace body 2 is supported and fixed by the steel structure 9, and the gas duct 422, the air duct 423, the top cold air duct 431 and the side cold air duct 432 are supported and fixed by the steel structure 9. Specifically, the steel structure 9 is a truss structure.
Second embodiment
The invention provides a high-temperature annealing method, which adopts a high-temperature annealing annular furnace in the first embodiment and comprises the following steps: according to the technological requirements of high-temperature annealing of the workpiece 13, controlling the temperature control mechanism 4 to heat and/or cool a plurality of positions of the furnace chamber 21, so that the furnace chamber 21 sequentially forms a plurality of processing areas 5 corresponding to the temperature requirements of a plurality of procedures of high-temperature annealing of the workpiece 13 along the circumferential direction; the stay time of the workpiece 13 in each processing area 5 is in accordance with the time requirement of each corresponding process; the rotary mechanism 3 drives the workpieces 13 on the annular furnace bottom 1 to sequentially rotate to a plurality of processing areas 5 from the loading and unloading area 61 for processing until the workpieces 13 return to the loading and unloading area 61, thereby completing high-temperature annealing.
According to the high-temperature annealing annular furnace, the temperature control mechanism 4 is controlled to heat and/or cool a plurality of positions of the furnace chamber 21 according to the process requirements of the high-temperature annealing process of the workpiece 13 to be subjected to high-temperature annealing, so that the furnace chamber 21 sequentially forms a plurality of processing areas 5 corresponding to the temperature requirements of a plurality of procedures of the high-temperature annealing of the workpiece 13 along the circumferential direction, and the staying time of the workpiece 13 in each processing area 5 is in accordance with the time requirements of each corresponding procedure, so that the high-temperature annealing annular furnace is suitable for the high-temperature annealing of the workpieces 13 with different specifications or different types.
According to one embodiment of the present invention, ensuring that the residence time of the workpiece 13 in each processing area 5 corresponds to the time requirement of each corresponding process comprises: according to the time requirements of a plurality of procedures of high-temperature annealing of the workpiece 13 and the circumferential length of the furnace chamber 21, determining the speed of the rotating mechanism 3 driving the annular furnace bottom 1 to rotate and the circumferential length of each corresponding processing area 5 in the furnace chamber 21, so that the residence time of the workpiece 13 in each processing area 5 meets the time requirements of each corresponding procedure of high-temperature annealing of the workpiece 13.
Specifically, the speed at which the rotating mechanism 3 drives the annular furnace body 2 to rotate is determined according to the sum of the circumferential length of the furnace chamber 21 and the time required by the plurality of processes corresponding to the plurality of processing areas 5, that is, the speed at which the rotating mechanism 3 rotates is equal to the sum of the circumferential length of the furnace chamber 21/the time required by the plurality of processes corresponding to the plurality of processing areas 5. According to the speed for driving the annular furnace body 2 to rotate and the time required by a plurality of working procedures corresponding to the plurality of processing areas 5, the circumferential length of each corresponding processing area 5 in the furnace chamber 21 is determined, and the circumferential length of each processing area 5 is equal to the product of the time required by the corresponding working procedure and the speed for driving the annular furnace body 2 to rotate by the rotating mechanism 3. According to the speed of the rotating mechanism 3 driving the annular furnace bottom 1 to rotate, the circumferential length of each processing area 5 is controlled through the temperature control mechanism 4, the time of the workpiece 13 staying in each processing area 5 is ensured to be in accordance with the time requirement of the corresponding procedure, so that the workpiece 13 processed in the previous processing area 5 can enter the next processing area 5, and the rhythm of each processing area 5 is the same.
According to one embodiment of the present invention, the rotating mechanism 3 employs intermittent rotation, each rotation being at an angle equal to the angle of arrangement between two circumferentially adjacent workpieces 13. Alternatively, the rotating mechanism 3 rotates at a constant speed, and the angular velocity of the constant speed rotation is equal to the arrangement angle between two circumferentially adjacent workpieces 13/(the time of each rotation + the time of each stay when the rotating mechanism 3 rotates intermittently).
In the present embodiment, as shown in fig. 5, the ratio of the circumferential lengths of the preheating zone 51, the first heat-retaining zone 521, the warming-up zone 522, the second heat-retaining zone 523, the first cooling zone 524, the second cooling zone 531 and the third cooling zone 532 and the ratio of the time required for seven processes corresponding to the preheating zone 51, the first heat-retaining zone 521, the warming-up zone 522, the second heat-retaining zone 523, the first cooling zone 524, the second cooling zone 531 and the third cooling zone 532 are all 3: 5: 17: 9: 5: 8: 6.
Specifically, the annular furnace bottom 1 is provided with a material level 11 for placing a workpiece 13. The plurality of material levels 11 are arranged in a row at regular intervals in the radial direction. The multiple rows of material positions 11 are uniformly distributed in a circle at intervals along the circumferential direction. In the present embodiment, 2 sites 11 are arranged in a row in the radial direction, and 60 rows of sites 11 are arranged uniformly at intervals in the circumferential direction. The arrangement angle between two adjacent rows of material positions 11 is 6 degrees. Wherein 53 the discharge position 11 is located in the annular furnace body 2, 3 the discharge position 11 is located in the preheating zone 51, 5 the discharge position 11 is located in the first heat preservation zone 521, 17 the discharge position 11 is located in the warming zone 522, 9 the discharge position 11 is located in the second heat preservation zone 523, 5 the discharge position 11 is located in the first cooling zone 524, 8 the discharge position 11 is located in the second cooling zone 531, 6 the discharge position 11 is located in the third cooling zone 532; a loading and unloading zone 61 with a discharge level 11 at the gap 6 is provided, and a fourth cooling zone 62 with a discharge level 11 at the gap 6 is provided.
The rotary mechanism 3 drives the annular furnace bottom 1 to rotate for 60 times, and the rotating angle is 6 degrees each time. The annular furnace bottom 1 stays for a period of time after rotating for 6 degrees. Taking the preheating zone 51 as an example, the sum of the total time of three rotations and the total time of three dwells is equal to the time required for preheating the workpiece 13. In the initial stage, every time the annular furnace bottom 1 rotates once, the workpiece 13 at the foremost row in the loading and unloading area 61 is conveyed to the preheating area 51 for preheating, and the workpiece 13 returns to the loading and unloading area 61 after the high-temperature annealing is finished, and then the continuous production stage is carried out, the annular furnace bottom 1 does not rotate once, so that the workpiece 13 at the foremost row in the loading and unloading area 61 is advanced to the preheating area 51 for preheating, meanwhile, the workpiece 13 at the foremost row in the preheating area 51 is preheated and is advanced to the first temperature preservation area 521 for heat preservation, the workpiece 13 at the foremost row in the first temperature preservation area 521 is preheated and is advanced to the temperature rise area 522 for temperature rise, the workpiece 13 at the foremost row in the temperature rise area 522 is preheated and is advanced to the second temperature preservation area 523 for heat preservation, the workpiece 13 at the foremost row in the second temperature preservation area 523 is heat preserved and is advanced to the first cooling area 524 for heat preservation, the workpiece 13 at the foremost row in the first cooling area 524 is firstly cooled and is advanced to the second cooling area 531 for secondary cooling, the second cooling of the workpiece 13 at the front row in the second cooling zone 531 is finished and the workpiece is sent to the third cooling zone 532 for the third cooling, the third cooling of the workpiece 13 at the front row in the third cooling zone 532 is finished and sent to the fourth cooling zone 62 for the fourth cooling, and the fourth cooling of the workpiece 13 at the front row in the fourth cooling zone 62 is finished and sent to the material loading and unloading zone 61 for unloading.
In another possible embodiment, as shown in fig. 6, when there are many processes of high temperature annealing of the workpieces 13, and a plurality of processing regions 5 corresponding to all processes cannot be formed in the circumferential direction of the annular furnace chamber 21, the temperature of the furnace chamber 21 is first adjusted by the temperature control mechanism 4, a plurality of processing regions 5 corresponding to the preceding processes are first formed in the circumferential direction, then the plurality of workpieces 13 on the annular furnace bottom 1 are sequentially rotated to the plurality of processing regions 5 by the rotation mechanism 3 to complete the processing of the preceding processes, then the loading and unloading material is not discharged when returning to the loading and unloading material region 61, the temperature of the furnace chamber 21 is second adjusted by the temperature control mechanism 4 to form a plurality of processing regions 5 corresponding to the following processes, and then the plurality of workpieces 13 on the annular furnace bottom 1 are sequentially rotated to the plurality of processing regions 5 by the rotation mechanism 3 to complete the processing of the following processes, and finally returned to the loading and unloading section 61 for unloading. Therefore, all the processes of high-temperature annealing are completed by rotating the workpiece 13 with the annular hearth 1 for two weeks.
In still another possible embodiment, as shown in fig. 7, the circumferential length of each processing area 5 is the same, the rotating mechanism 3 is controlled to continue rotating, and meanwhile, a batch of workpieces 13 are placed on the annular furnace bottom 1 from the loading and unloading area 61 along the circumferential direction at intervals, when the batch of workpieces 13 sequentially enters the first processing area 5, the rotating mechanism 3 is controlled to stop and rotate according to the time requirement of the corresponding process until the dwell time of the first workpiece 13 in the processing area 5 in the area is consistent with the time requirement of the corresponding process, and then the rotating mechanism 3 is controlled to continue rotating according to the time difference of the dwell time of the first workpiece 13 and the last workpiece 13 in the area and the circumferential length of the area, so that the batch of workpieces 13 enter the next processing area 5 one by one, and each workpiece 13 stays in the last processing area 5 for the same time and all meets the time requirement of the corresponding process, the steps are repeated until the batch of workpieces 13 completes all the processes, the batch of workpieces 13 returns to the material loading and unloading area 61' for discharging, and then the next batch of workpieces 13 are placed on the annular furnace bottom 1 from the material loading area at intervals along the circumferential direction, so that a plurality of workpieces 13 are processed in batches, compared with the embodiment, the processing efficiency is reduced, and the batch production of the workpieces 13 subjected to high-temperature annealing can be realized. Wherein the number of workpieces 13 per batch is less than or equal to the maximum number of workpieces 13 that can be accommodated in one machining region 5. The stop and rotation of the rotating mechanism 3 are controlled, so that the stay time of the workpiece 13 in each processing area 5 is in accordance with the time requirement of each corresponding process
The above description is only a few embodiments of the present invention, and those skilled in the art can make various changes or modifications to the embodiments of the present invention according to the disclosure of the application document without departing from the spirit and scope of the present invention.
Claims (20)
1. A high temperature annealing ring furnace, characterized by comprising:
the annular furnace bottom is circumferentially and alternately distributed with a plurality of workpieces;
the annular furnace body covers the annular furnace bottom and is in sliding connection with the annular furnace bottom along the circumferential direction, a furnace chamber is arranged in the annular furnace body, a gap is formed in the annular furnace body, and a material loading and unloading area is arranged at the gap;
the rotating mechanism is used for driving the annular furnace bottom to rotate;
and the temperature control mechanism is used for respectively adjusting the temperature of a plurality of positions of the furnace chamber so that a plurality of processing areas corresponding to the temperature requirements of a plurality of procedures of high-temperature annealing of the workpiece are sequentially formed in the furnace chamber along the circumferential direction.
2. The high temperature annealing ring furnace of claim 1,
the circumferential length of each machining area is equal to the circumferential length of the annular furnace bottom rotating in the time required by the corresponding process.
3. The high temperature annealing ring furnace of claim 1,
the plurality of processing areas comprise a preheating area, a heating area and a cooling area which are sequentially distributed along the circumferential direction.
4. The high temperature annealing ring furnace of claim 3,
the heating zone comprises a first heat preservation zone, a heating zone, a second heat preservation zone and a first cooling zone which are sequentially distributed along the circumferential direction;
the cooling zone comprises a second cooling zone and a third cooling zone which are sequentially distributed along the circumferential direction, and the loading and unloading zone is positioned between the preheating zone and the third cooling zone.
5. The high temperature annealing ring furnace of claim 4,
the ratios of the circumferential lengths of the preheating zone, the first heat preservation zone, the warming zone, the second heat preservation zone, the first cooling zone, the second cooling zone and the third cooling zone and the ratios of the time required by seven working procedures corresponding to the preheating zone, the first heat preservation zone, the warming zone, the second heat preservation zone, the first cooling zone, the second cooling zone and the third cooling zone are all 3: 5: 17: 9: 5: 8: 6.
6. The high temperature annealing ring furnace of claim 4,
the preheating zone is characterized in that a first furnace door is arranged at an inlet of the preheating zone, a second furnace door is arranged between the first cooling zone and the second cooling zone, a third furnace door is arranged between the second cooling zone and the third cooling zone, and a fourth furnace door is arranged at an outlet of the third cooling zone.
7. The high temperature annealing ring furnace of claim 3,
the temperature control mechanism comprises a preheating structure with an output end positioned in the preheating zone, a heating structure with an output end positioned in the heating zone and a cooling structure with an output end positioned in the cooling zone.
8. The high temperature annealing ring furnace of claim 7,
the annular furnace body is provided with a smoke exhaust mechanism for exhausting high-temperature smoke in the annular furnace body;
the preheating structure comprises a preheating flue gas pipeline, the input end of the preheating flue gas pipeline is communicated with the smoke exhaust mechanism, and the output end of the preheating flue gas pipeline is communicated with the preheating zone of the annular furnace body.
9. The high temperature annealing ring furnace of claim 7,
the output ends of the heating structures are arranged along the circumferential direction of the heating area;
the heating structure comprises a burner, a gas pipeline and an air pipeline,
the combustor is arranged on at least one side wall of the annular furnace body and is positioned between two circumferentially adjacent workpieces;
the gas pipeline is communicated with the combustor;
the air duct is in communication with the burner.
10. The high temperature annealing ring furnace of claim 7,
the output ends of the cooling structures are arranged along the circumferential direction of the cooling area, and the output ends of the cooling structures are positioned between two circumferentially adjacent workpieces.
11. The high temperature annealing ring furnace of claim 10,
the cooling structure comprises a side cold air pipeline and a plurality of top cold air pipelines;
the side cold air pipeline extends from at least one side wall of the annular furnace body;
the top cold air pipeline extends into the annular furnace body from the top wall of the annular furnace body, and a plurality of top pipelines are arranged in a row along the radial direction of the annular furnace body.
12. The high temperature annealing ring furnace of claim 7,
a refractory fiber light structure is laid on the inner wall surface of the annular furnace body;
the light-duty structure of fire-resistant fiber includes aluminium silicate fire-resistant fiber module and the aluminium silicate fire-resistant fiber blanket of range upon range of laying, aluminium silicate fire-resistant fiber blanket is located the cooling zone, aluminium silicate fire-resistant fiber module is located preheating zone and heating zone.
13. The high temperature annealing ring furnace of claim 1,
and a fourth cooling area for naturally cooling and cooling the workpiece by blowing is further arranged at the notch.
14. The high temperature annealing ring furnace of claim 1,
an inner cover and a protective gas pipeline are also arranged on the annular furnace bottom;
the annular furnace bottom is provided with an annular groove matched with a cover opening of the inner cover, a sand layer is filled in the annular groove, the inner cover is inserted in the sand layer, and the single workpiece on the annular furnace bottom is covered;
the protective gas pipe extends from the annular furnace bottom into the inner cover and is used for supplying or discharging protective gas into the inner cover.
15. The high temperature annealing ring furnace of claim 1,
and a workpiece supporting device is arranged on the annular furnace bottom.
16. The high temperature annealing ring furnace of claim 1,
the rotating mechanism comprises an annular sliding rail, a roller, a trolley and a rotating driving assembly;
the annular slide rail is fixed on a concrete foundation, and the roller is arranged at the bottom of the trolley; or
The roller is arranged on a concrete foundation, and the annular slide rail is fixed at the bottom of the trolley;
the roller is connected with the annular sliding rail in a sliding manner;
the annular furnace bottom is arranged on the trolley, and the movable end of the rotary driving assembly is connected with the trolley and used for driving the trolley to rotate.
17. The high temperature annealing ring furnace of claim 1,
the annular furnace body is supported and fixed through a steel structure fixed on a concrete foundation.
18. A high temperature annealing method, characterized in that the high temperature annealing circular furnace of any one of claims 1 to 17 is used, comprising the steps of:
according to the process requirement of the high-temperature annealing of the workpiece, controlling the temperature control mechanism to heat and/or cool a plurality of positions of the furnace chamber, so that a plurality of processing areas corresponding to the temperature requirements of a plurality of procedures of the high-temperature annealing of the workpiece are sequentially formed in the circumferential direction of the furnace chamber;
the stay time of the workpiece in each machining area conforms to the time requirement of each corresponding process;
the workpiece on the annular furnace bottom is driven by the rotating mechanism to sequentially rotate to a plurality of machining areas from the material loading and unloading area for machining until the workpiece returns to the material loading and unloading area, so that high-temperature annealing is completed.
19. The high temperature annealing method of claim 18, wherein ensuring that the workpiece stays in each of the processing regions for a time corresponding to the time requirement of each of the corresponding processes comprises:
according to the time requirements of a plurality of procedures of high-temperature annealing of the workpiece and the circumferential length of the furnace chamber, determining the speed of the rotating mechanism driving the annular furnace bottom to rotate and the circumferential length of each corresponding processing area in the furnace chamber, so that the stay time of the workpiece in each processing area meets the time requirements of each corresponding procedure of high-temperature annealing of the workpiece.
20. The high temperature annealing method according to claim 18, wherein the rotating mechanism employs intermittent rotation, each rotation being at an angle equal to a layout angle between two circumferentially adjacent workpieces.
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| CN202110891511.7A CN113462881A (en) | 2021-08-04 | 2021-08-04 | High-temperature annealing annular furnace and high-temperature annealing method |
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| CN202110891511.7A CN113462881A (en) | 2021-08-04 | 2021-08-04 | High-temperature annealing annular furnace and high-temperature annealing method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114277241A (en) * | 2022-01-05 | 2022-04-05 | 首钢智新迁安电磁材料有限公司 | Device for high-temperature annealing of oriented silicon steel and high-temperature annealing method of oriented silicon steel |
| CN114875216A (en) * | 2022-05-10 | 2022-08-09 | 上海汽车变速器有限公司 | Bevel gear spheroidizing annealing process and push rod furnace |
| CN117887955A (en) * | 2024-03-15 | 2024-04-16 | 包头市威丰稀土电磁材料股份有限公司 | Process control method for normalizing non-oriented electrical steel by adopting single high-temperature annealing furnace |
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2021
- 2021-08-04 CN CN202110891511.7A patent/CN113462881A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114277241A (en) * | 2022-01-05 | 2022-04-05 | 首钢智新迁安电磁材料有限公司 | Device for high-temperature annealing of oriented silicon steel and high-temperature annealing method of oriented silicon steel |
| CN114277241B (en) * | 2022-01-05 | 2023-07-28 | 首钢智新迁安电磁材料有限公司 | High-temperature annealing method of oriented silicon steel |
| CN114875216A (en) * | 2022-05-10 | 2022-08-09 | 上海汽车变速器有限公司 | Bevel gear spheroidizing annealing process and push rod furnace |
| CN117887955A (en) * | 2024-03-15 | 2024-04-16 | 包头市威丰稀土电磁材料股份有限公司 | Process control method for normalizing non-oriented electrical steel by adopting single high-temperature annealing furnace |
| CN117887955B (en) * | 2024-03-15 | 2024-05-10 | 包头市威丰稀土电磁材料股份有限公司 | Process control method for normalizing non-oriented electrical steel by adopting single high-temperature annealing furnace |
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