CN111394566B - Air slow cooling system for continuous annealing and cooling of strip - Google Patents
Air slow cooling system for continuous annealing and cooling of strip Download PDFInfo
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- CN111394566B CN111394566B CN202010135465.3A CN202010135465A CN111394566B CN 111394566 B CN111394566 B CN 111394566B CN 202010135465 A CN202010135465 A CN 202010135465A CN 111394566 B CN111394566 B CN 111394566B
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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
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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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- 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
- C21D1/84—Controlled slow cooling
Abstract
The invention relates to an air slow cooling system for continuous annealing and cooling of a strip, which is characterized in that: consists of an air supply device, an air slow cooling device and an air exhaust device; the air slow cooling device comprises a box body and a plurality of air slow cooling air knife structures arranged in the box body, wherein the air slow cooling air knife structures are arranged in the box body in an up-down symmetrical mode to form a bidirectional air slow cooling air spraying structure with the front side and the back side taking a workpiece as a center; the air slow cooling air knife structure is connected with the side wall of the box body through the positioning and adjusting structure, an air outlet is formed in the top of the box body, and the air exhaust device is arranged at the air outlet to form a forced air exhaust structure; the air outlet end of the air supply device is connected with the air inlets of the upper and lower air slow cooling air knife structures to form an adjustable air inlet structure; the process control structure of the continuous annealing cooling slow cooling section of the strip is formed by adjusting the air inlet flow and the air inlet pressure of the air slow cooling device and the distance from an air spraying opening of the air slow cooling air knife structure to the workpiece. The method has the characteristics of reducing the internal stress of the strip material during cooling, obtaining good plate shape and the like.
Description
Technical Field
The invention relates to an air slow cooling system for continuous annealing and cooling of a strip, which is suitable for black annealing and cooling of a metal strip. The technology is used for controlling the cooling uniformity and the plate shape goodness of the high-temperature slow cooling section of the strip. Belongs to the technical field of metallurgy.
Background
With the development of the metal strip mill technology, the strip product is wider and thinner, and the requirement on the shape of the product is higher and higher. For the automobile industry, the flatness of the plate reaches +/-10 IU, and the convexity of the plate reaches 10 mu m, so that the rolling technology has higher requirements; the quality of the plate shape depends on the distribution of residual internal stress of the strip, and the generation of the residual internal stress can be generated in the annealing and cooling process of the strip besides the majority of the residual internal stress from the rolling process; the control of the cooling speed is one of the influencing factors, and in the high-temperature annealing cooling process, the cooling speed and the cross section cooling uniformity are important factors influencing the shape of the plate. In the prior art, a gas cooling mode is generally adopted. However, the prior art has the defects of unreasonable gas cooling structure, excessively high or excessively low gas cooling speed, and the problems of uneven cooling, poor stress relieving effect, easy deformation and the like caused by excessively high or excessively low cooling speed at 1080-900 ℃ in the high-temperature section of strip annealing.
Disclosure of Invention
The invention aims to solve the problems of uneven cooling at 1080-900 ℃ in a strip annealing high-temperature section, poor stress relief effect, easy deformation and the like of a strip continuous annealing cooling device in the prior art, and provides an air slow cooling system for strip continuous annealing cooling. The method has the prominent substantive characteristics and technical progress that the cooling rate of the strip continuous annealing high-temperature slow section at 1080-900 ℃ is less than 20 ℃/S, the cooling of the cross section of the strip in the width direction is uniform, the cooling internal stress of the strip is reduced, and a good plate shape is obtained.
The purpose of the invention can be achieved by adopting the following technical scheme:
the utility model provides an air slow cooling system that continuous annealing cooling of strip was used which structural feature lies in: the device consists of an air supply device, an air slow cooling device and an air exhaust device; the air slow cooling device comprises a box body and a plurality of air slow cooling air knife structures arranged in the box body, wherein the air slow cooling air knife structures are arranged in the box body in an up-down symmetrical mode, and air injection ports of the upper air slow cooling air knife structure and the lower air slow cooling air knife structure are opposite to each other to form a front-back bidirectional air slow cooling air injection structure taking a workpiece as a center; the air slow cooling air knife structure is connected with the side wall of the box body through the positioning and adjusting structure, so that the relative positions of the upper air slow cooling air knife structure and the lower air slow cooling air knife structure can be adjusted; the top of the box body is provided with an air outlet, and the air exhaust device is arranged at the air outlet to form a forced air exhaust structure so as to exhaust hot air in the box body from the air outlet; the air outlet end of the air supply device is connected with the air inlets of the upper air slow cooling air knife structure and the lower air slow cooling air knife structure to form an adjustable air inlet structure; the process control structure of the continuous annealing cooling slow cooling section of the strip is formed by adjusting the air inlet flow and the air inlet pressure of the air slow cooling device and the distance from an air spraying opening of the air slow cooling air knife structure to the workpiece.
The purpose of the invention can be achieved by adopting the following technical scheme:
furthermore, a plurality of exhaust baffles are arranged at the air outlet of the box body and connected in the inner cavity of the box body through a support plate; a gap with the width of 20mm is reserved between the adjacent exhaust baffles, and the distance W3 between the exhaust baffles on the two sides and the wall of the inner cavity of the box body is 250mm, so that hot air is upwards extracted from the gaps on the two sides of the exhaust baffles and the wall of the inner cavity of the box body.
Furthermore, the air supply device comprises an air blower and an air regulating valve, the air outlet end of the air blower is connected with the air inlet end of the air regulating valve through a pipeline, and the air outlet of the air regulating valve is connected with the air inlet of the air slow cooling air knife structure to form an air supply and regulation structure, so that the air spraying pressure and the air flow can be regulated; the exhaust device comprises an exhaust fan which is communicated with an air outlet at the top of the box body through a pipeline.
Furthermore, a valve is arranged at the joint of the air outlet end of the air blower and the air regulating valve; the air slow cooling air knife structures are sequentially arranged in the box body in an equidistant and transverse staggered manner along the running direction of the workpiece, and the distances from the upper air slow cooling air knife structure to the strip surface and the distances from the lower air slow cooling air knife structure to the strip surface can be set and adjusted according to the cooling rate required by the process; two upper and lower air slow cooling air knife structures in opposite directions are in a group, and each group of air slow cooling air knife structures are used for air inlet at the same side so as to form a structure with the consistency and the speed uniformity of air backpressure in an air pipe.
Furthermore, the air slow cooling air knife structure comprises an air pipe, wherein the front end of the air pipe is provided with an air inlet, and the rear end of the air pipe is closed; the side wall of the air pipe is provided with an air outlet along the length direction, the air outlet is formed by strip-shaped notches arranged along the length direction on the side wall of the air pipe 1, two bent plates are arranged at the air outlet, the bent plates enclose the air outlet to form a strip-shaped nozzle with a Y-shaped cross section, and the center of the strip-shaped nozzle with the Y-shaped cross section corresponds to the center of the air outlet to form an air knife structure; the inner cavity of the strip-shaped nozzle with the Y-shaped cross section forms an air spraying channel, the front section of the air spraying channel expands, the rear section of the air spraying channel contracts, the front end and the air outlet of the strip-shaped nozzle with the Y-shaped cross section are communicated, and the rear end of the strip-shaped nozzle is an air spraying port, so that a slow cooling type air knife structure with the functions of speed reduction and secondary acceleration is formed.
Furthermore, the air outlet is formed by a strip-shaped notch arranged on the side wall of the air pipe along the length direction or a plurality of air outlet holes arranged in a straight line, the length dimension of the strip-shaped notch is larger than the width dimension of the workpiece, and the length dimension of the strip-shaped nozzle is equivalent to that of the strip-shaped notch; two flat plates are respectively arranged at two ends of the bent plate, and the flat plates and the end parts of the bent plate are welded, sealed and fixedly welded to the air pipes to form the air knife air injection port with the periphery closed.
Further, the width of the strip-shaped notch is W1=5mm-7mm, so as to correspond to the set speed of the air passing through the strip-shaped notch; the two bent plates are symmetrically welded to the air pipe along the length direction of the air pipe by taking the position of the strip-shaped notch as the center to form a gradually narrowed strip-shaped nozzle; the two bent plates are bent inwards, the front section of the formed air spraying channel is in a large horn shape, the rear section of the formed air spraying channel is in a small horn shape, the included angle at the joint of the front section and the rear section is alpha = 120-150 degrees, and R arc transition is formed; two ends of the two bent plates are welded through seal plates to form a structure with closed periphery.
Furthermore, in the strip-shaped nozzle, a plurality of coaxial circular holes are formed in the middle of the strip-shaped nozzle along the length direction of the air pipe on the two bent plates, and the strip-shaped nozzle is fixed by welding through penetrating the coaxial circular holes of the two bent plates through a round steel positioning block; and a plurality of square steel positioning blocks are distributed and welded at the outlet of the strip-shaped nozzle to fix the strip-shaped nozzle, so that the outlet gaps formed by the two bent plates are ensured to be W2=5mm-7mm in the same size, and the uniformity of the flow at the outlet is ensured.
Furthermore, the positioning and adjusting structure is arranged at two ends of the air pipe and comprises one positioning plate and two positioning plates, and the one positioning plate and the two positioning plates are respectively provided with an adjusting screw rod; an angle steel is arranged on the box body, and the adjusting screw penetrates through a through hole of the angle steel and is movably connected with one of the nut connecting positioning plates, the second positioning plate and the four clamping blocks to form an up-and-down adjusting structure; after the two ends of the air pipe are welded and fixed with the first positioning plate and the second positioning plate, the adjusting screw is in threaded connection with the nut through the opening of the angle steel; the first positioning plate and the second positioning plate are respectively connected with the box body through a gasket to form a sealing structure; the clamping blocks are fastened on the box body through bolts to form a positioning structure; and limiting blocks are arranged at the relative positions of the angle steels in the box body to form a limiting structure.
In practical application, the distance between the strip-shaped nozzles and a workpiece (strip) can be adjusted by adjusting the adjusting screw rod, so that the speed of wind sprayed by the strip-shaped nozzles to a strip surface can be adjusted within a certain range, and the adjustment of the cooling speed is realized. The minimum distance of the strip-shaped nozzle relative to the workpiece (strip) is limited by the limiting block.
Through location and regulation structure, can from last down and from down up form to work piece gushing wind structure in practical application to the distance of strip spout for the work piece is adjustable.
Furthermore, the air slow cooling air knife structure supplies air in the same direction, one end of the air pipe is an air inlet, and the air inlet end is connected to the box body through one of the positioning plates; the other end of the air pipe is welded and sealed by a sealing plate, a circular pipe is welded on the outer side of the sealing plate to be used as a positioning piece, and plate ribs are welded at the joint of the circular pipe and the sealing plate to form a reinforced connection structure; and the round pipe is welded with the inner side of the second positioning plate through the sleeve and is positioned on the box body.
Furthermore, a guide plate is welded in the sleeve, and the sleeve is fixedly connected with the circular tube through the guide plate.
The invention has the following prominent substantive characteristics and remarkable technical progress:
1. the invention is composed of an air supply device, an air slow cooling device and an air exhaust device; the air slow cooling device comprises a box body and a plurality of air slow cooling air knife structures arranged in the box body, wherein the air slow cooling air knife structures are symmetrically arranged in the box body from top to bottom, and air injection ports of the upper air slow cooling air knife structure and the lower air slow cooling air knife structure are opposite to form a front-back bidirectional air slow cooling air injection structure taking a workpiece as a center; the air slow cooling air knife structure is connected with the side wall of the box body through the positioning and adjusting structure, so that the relative positions of the upper air slow cooling air knife structure and the lower air slow cooling air knife structure can be adjusted; the top of the box body is provided with an air outlet, and the air exhaust device is arranged at the air outlet to form a forced air exhaust structure so as to exhaust hot air in the box body from the air outlet; the air outlet end of the air supply device is connected with the air inlets of the upper air slow cooling air knife structure and the lower air slow cooling air knife structure to form an adjustable air inlet structure; the process control structure of the continuous annealing and cooling slow cooling section of the strip is formed by adjusting the air inlet flow and the air inlet pressure of the air slow cooling device and the distance from the air outlets of the upper and lower air slow cooling air knife structures to the workpiece, so that the process control of the annealing and cooling slow cooling section is realized; therefore, the cooling device can solve the problems of uneven cooling at the high temperature range of 1080-900 ℃ in the strip annealing, poor stress relief effect, easy deformation and the like of the strip continuous annealing cooling device in the prior art, and has the prominent substantive characteristics and technical progress that the cooling rate at the high temperature range of 1080-900 ℃ in the strip continuous annealing slow section is less than 20 ℃/S, the cross section of the strip in the width direction is cooled uniformly, the cooling internal stress of the strip is reduced, and a good plate shape is obtained.
2. The invention can calculate and set the length of the air slow cooling according to the capacity and the process requirement of the strip annealing, and realizes the control of the cooling process of the high-temperature slow cooling section of different strip annealing by adjusting the air inlet flow and the air inlet pressure of the air slow cooling device and the distance from the nozzle of the air knife to the strip surface, so that the strip is uniformly cooled at a certain cooling speed in the width direction, the cooling deformation and the internal stress of the strip in the high-temperature section are reduced as much as possible, and a precondition is provided for obtaining good strip shape.
3. The invention effectively solves the problem of non-uniformity of the air-jet relative to the cross section of the strip surface of the annealing slow cooling section, and simultaneously ensures that the strip is cooled more fully in the width direction, thereby reducing the cooling internal stress of the strip and obtaining good strip shape.
Drawings
FIG. 1 is a cross-sectional view of a structure of an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of an air slow cooling device according to an embodiment of the present invention.
Fig. 3 is a top view of an air-cooling apparatus according to an embodiment of the present invention.
Fig. 4 is a sectional view taken along line C-C of fig. 3.
Fig. 5 is a sectional view taken along line D-D of fig. 4.
Fig. 6 is a partial schematic structural view of an air-cooling apparatus according to an embodiment of the invention.
Fig. 7 is a second partial schematic structural view of an air-cooling apparatus according to an embodiment of the present invention.
Fig. 8 is a front view of the air knife structure of the air slow cooling device according to the embodiment of the present invention.
Fig. 9 isbase:Sub>A schematic view of the structure in the direction ofbase:Sub>A-base:Sub>A in fig. 8.
Fig. 10 is an enlarged view of a portion of the structure at X in fig. 9.
FIG. 11 is a schematic view of the structure along line B-B of FIG. 8.
FIG. 12 is a schematic diagram showing the velocity change of the air slow cooling system passing through the air duct and the air knife edge.
FIG. 13 is a schematic diagram showing the velocity distribution of the air slow cooling system of the present invention at different distances from the upwind blade.
FIG. 14 is a schematic diagram of velocity distribution of the air slow cooling system of the present invention at different distances from the bottom air knife edge.
Detailed Description
Specific example 1:
referring to fig. 1 to 5, the present embodiment 1 is composed of an air supply device 40, an air slow cooling device, and an air exhaust device 50; the air slow cooling device comprises a box body 20 and a plurality of air slow cooling air knife structures arranged in the box body 20, wherein the air slow cooling air knife structures are arranged in the box body 20 in an up-and-down symmetrical mode, and air injection ports of the upper air slow cooling air knife structure and the lower air slow cooling air knife structure are opposite to form a front-and-back bidirectional air slow cooling air injection structure taking a workpiece as a center; the air slow cooling air knife structure is connected with the side wall of the box body 20 through a positioning and adjusting structure 7, so that the relative positions of the upper air slow cooling air knife structure and the lower air slow cooling air knife structure can be adjusted; an air outlet 20-1 is arranged at the top of the box body 20, and the air exhaust device 50 is arranged at the air outlet to form a forced air exhaust structure so as to exhaust hot air in the box body 20 from the air outlet 20-1; the air outlet end of the air supply device 40 is connected with the air inlets of the upper and lower air slow cooling air knife structures to form an adjustable air inlet structure; the process control structure of the strip continuous annealing cooling slow cooling section is formed by adjusting the air inlet flow and the air inlet pressure of the air slow cooling device and the distance between an air injection port of the upper air slow cooling air knife structure and an air injection port of the lower air slow cooling air knife structure and a workpiece; and the process control of the annealing cooling slow cooling section is realized.
In this embodiment:
a plurality of exhaust baffles 13 are arranged at the air outlet of the box body 20, and the exhaust baffles 13 are connected in the inner cavity of the box body 20 through supporting plates 14; a gap with the width of 20mm is reserved between the adjacent exhaust baffles 13, and the distance W3 between the exhaust baffles 13 on the two sides and the inner cavity wall of the box body is 250mm, so that hot air is upwards extracted from the gaps between the exhaust baffles 13 and the two sides of the inner cavity wall of the box body.
The air supply device 40 comprises an air blower 40-1 and an air regulating valve 40-2, the air outlet end of the air blower 40-1 is connected with the air inlet end of the air regulating valve 40-2 through a pipeline, the air outlet of the air regulating valve 40-2 is connected with the air inlet of the air slow cooling air knife structure to form an air supply and regulation structure, so that the air spraying pressure and the air flow can be regulated; the exhaust device 50 comprises an exhaust fan 50-1, and the exhaust fan 50-1 is communicated with an air outlet 20-1 at the top of the box body 20 through a pipeline.
A valve 40-3 is arranged at the joint of the air outlet end of the blower 40-1 and the air regulating valve 40-2; the air slow cooling air knife structures are sequentially arranged in the box body 20 in an equidistant and transverse staggered manner along the running direction of the workpiece, and the distances from the upper air slow cooling air knife structure to the strip surface and the distances from the lower air slow cooling air knife structure to the strip surface can be set and adjusted according to the cooling rate required by the process; two upper and lower air slow cooling air knife structures in opposite directions are a set of, and every air slow cooling air knife structure of group is the homonymy air inlet to constitute the uniformity and the speed homogeneity structure of air back pressure in tuber pipe 1.
Referring to fig. 6 to 11, the air slow cooling air knife structure comprises an air pipe 1, wherein an air inlet 1-1 is formed in the front end of the air pipe 1, and the rear end of the air pipe is closed; the air-jet type air-jet device is characterized in that air outlets 1-2 are formed in the length direction of the side wall of an air pipe 1, the air outlets 1-2 are formed by strip-shaped notches formed in the length direction of the side wall of the air pipe 1, two bent plates 2 are arranged at the positions of the air outlets 1-2, the air outlets 1-2 are enclosed through the bent plates 2 to form strip-shaped nozzles 3 with Y-shaped cross sections, and the centers of the strip-shaped nozzles 3 with the Y-shaped cross sections correspond to the centers of the air outlets 1-2 to form an air knife structure; an air spraying channel is formed in the inner cavity of the strip-shaped nozzle 3 with the Y-shaped cross section, the front section of the air spraying channel is expanded, the rear section of the air spraying channel is contracted, the front end of the strip-shaped nozzle 3 with the Y-shaped cross section is communicated with the air outlet 1-2, and the rear end of the strip-shaped nozzle 3 with the Y-shaped cross section is an air spraying port, so that a slow cooling type air knife structure with the functions of first speed reduction and second speed acceleration is formed.
The air outlet 1-2 is formed by strip-shaped notches arranged on the side wall of the air pipe 1 along the length direction, the length dimension of each strip-shaped notch is larger than the width dimension of a workpiece, and the length dimension of each strip-shaped nozzle 3 is equivalent to that of each strip-shaped notch; two flat plates 4 are respectively arranged at two ends of the bent plate 2, and the flat plates 4 and the end part of the bent plate 2 are welded, sealed and fixedly welded to the air pipe 1 to form an air knife air injection opening with the periphery closed.
The width of the strip-shaped notch is W1=5mm-7mm, so that the speed of the air passing through the strip-shaped notch is correspondingly set; the two bent plates 2 are symmetrically welded on the air pipe 1 along the length direction of the air pipe 1 by taking the position of the strip-shaped notch as the center to form a gradually narrowed strip-shaped nozzle 3; the two bent plates 2 are bent inwards, the front section of the formed air spraying channel is in a large horn shape, the rear section of the formed air spraying channel is in a small horn shape, the included angle of the connection part of the front section and the rear section is alpha = 120-150 degrees, and R arc transition is formed; two ends of the two bent plates 2 are welded through the flat plates 4 to form a structure with closed periphery.
In the strip-shaped nozzle 3, a plurality of coaxial circular holes are formed in the two bent plates 2 in the middle along the length direction of the air pipe 1, a round steel positioning block 5 penetrates through the coaxial circular holes of the two bent plates 2, and the strip-shaped nozzle 3 is fixedly connected through welding so as to ensure that the size of the strip-shaped nozzle 3 is unchanged; at the outlet of the strip-shaped nozzle 3, a plurality of square steel positioning blocks 6 are distributed and welded to fix the strip-shaped nozzle 3, so that the outlet gaps formed by the two bent plates 2 are ensured to be W2=5mm-7mm in the same size, and the uniformity of the flow at the outlet is ensured.
The positioning and adjusting structures 7 are arranged at two ends of the air pipe 1, the positioning and adjusting structures 7 comprise a first positioning plate 7-1 and a second positioning plate 7-2, and the first positioning plate 7-1 and the second positioning plate 7-2 are respectively provided with an adjusting screw 7-3; an angle steel 7-5 is arranged on the box body 20, an adjusting screw 7-3 penetrates through a through hole of the angle steel 7-5 and then is connected with a nut 7-4 to be connected with one 7-1 of the positioning plates, and a second 7-2 of the positioning plates is movably connected with four clamping blocks 7-7 to form an up-and-down adjusting structure; after two ends of the air pipe 1 are welded and fixed with the first positioning plate 7-1 and the second positioning plate 7-2, the adjusting screw 7-3 is in threaded connection with the nut 7-4 through an opening of the angle steel 7-5; the first positioning plate 7-1 and the second positioning plate 7-2 are respectively connected with the box body 20 through a gasket 7-6 to form a sealing structure; the clamping blocks 7-7 are fastened to the box body 20 through bolts to form a positioning structure; and the relative position of the angle steel 7-5 in the box body 20 is provided with a limiting block 7-8 to form a limiting structure.
In practical application, the distance between the strip-shaped nozzles 3 and a workpiece (strip) can be adjusted by adjusting the adjusting screw rods 7-3, so that the speed of wind sprayed by the strip-shaped nozzles 3 to the strip surface can be adjusted within a certain range, and the adjustment of the cooling speed is realized. The minimum distance of the strip-shaped nozzle 3 relative to the workpiece (strip) is limited by the limiting blocks 7-8.
Through location and regulation structure 7, can from last down and from down up form to work piece gushing air structure in practical application to strip spout 3 is adjustable for the distance of work piece.
The air slow cooling air knife structure supplies air in the same direction, one end of the air pipe 1 is an air inlet, and the air inlet is connected to the box body 20 through one of the positioning plates 7-1; the other end of the air pipe 1 is welded and sealed by a sealing plate 8, a round pipe 10 is welded on the outer side of the sealing plate 8 to be used as a positioning piece, and a plate rib 9 is welded at the joint of the round pipe 10 and the sealing plate 8 to form a reinforced connecting structure; and the circular tube 10 is welded with the inner side of the second positioning plate 7-2 through a sleeve 11 and is positioned on the box body.
A guide plate 12 is welded in the sleeve 11, and the sleeve 11 is fixedly connected with the circular tube 10 through the guide plate 12.
Although the air slow cooling air knife structure is not completely the same at the intraductal wind speed of strip width direction, through adopting multiunit air slow cooling device crisscross the arranging in proper order, can correct the air slow cooling device and to strip width direction cooling inhomogeneous, reduce the strip and warp.
Because the coverage range W1 of the strip-shaped air injection port of the air slow cooling air knife structure is wider than the width W2 of the strip, the coverage range of air cooling is enlarged; the upper air slow cooling air knife structure is away from the belt surface H1, and the lower air slow cooling air knife structure is away from the belt surface H2.
The main pipeline is provided with a valve 40-3, an air inlet pipeline of each air slow cooling device is provided with an air regulating valve 40-2, and air supplied by an air blower 40-1 is distributed to each group of air slow cooling devices through pipelines. The control method of the system realizes the process control of annealing cooling slow-cooling sections of different strips by adjusting the air inlet flow and the air inlet pressure of the air slow-cooling device and the distance from a nozzle of an air knife to a strip surface.
In practical application, 7kpa and 2980m are respectively introduced into each air knife 3 Low pressure large flow air/h, air entering air bufferThe cold device is sprayed on the surface of the strip through a Y-shaped nozzle.
Referring to the experimental data in fig. 12, the farther the strip-shaped nozzles 3 are, the smaller the wind speed is; the change of the wind speed at the position 50-125mm away from the strip-shaped nozzle 3 is very smooth and is only gently reduced to 15m/s from 35m/s, the distance for adjusting the upper and lower positions of an air knife of the air slow cooling device is 110mm, the wind spraying speed is controlled to be 22m/s and is adjusted in a smooth area, the cooling speed can be effectively controlled according to an annealing process, and the cooling deformation of a high-temperature slow cooling section of a strip material is effectively controlled.
Referring to the experimental data in fig. 13 and 14, it can be seen that the wind speed distribution in the belt width direction at different positions from the nozzle of the air knife fluctuates only within a range of ± 2m/s, and the wind speed from the wind ejected from the upper and lower air knives to the belt surface is 15 ± 2m/s, which illustrates the cooling uniformity of the slow cooling system and the uniformity of the cooling rates of the upper and lower air knives of the present invention, and further effectively controls the cooling deformation of the strip.
The material of the parts used in this embodiment is 304 stainless steel, which increases the durability of the device.
Specific example 2:
the specific embodiment 2 of the present invention is characterized in that: the air outlet 1-2 is composed of a plurality of air outlet holes which are arranged in a straight line along the length direction on the side wall of the air pipe 1. The rest is the same as in embodiment 1.
Specific example 3:
the specific embodiment 3 of the present invention is characterized in that: the air slow cooling air knife structure is sequentially arranged in the box body 20 in an equidistant and transverse staggered manner along the running direction of the workpiece. The rest is the same as in embodiment 1.
Through the practical application of the applicant, the air forms the air knife curtain through the strip-shaped nozzles 3, and the air is uniformly sprayed on the strip surface, so that the strip is uniformly cooled in the width direction, and the cooling uniformity of the strip is improved; the strip-shaped nozzles 3 are used for forming an air outlet which is gradually narrowed, so that the sprayed air is in a state of being gradually accelerated after being buffered in the strip-shaped nozzles 3, and the speed of the air sprayed from the air knife edge is more uniform and stable; meanwhile, the strip-shaped nozzle structure is adopted, so that the cooling air can be uniformly sprayed to the surface of the strip at a required speed. The two ends of the air knife are fixed on the box body through the positioning plates which can adjust the up-down positions, the distance from the air injection port to the strip surface can be adjusted at any time according to different strips so as to adjust different cooling speeds required by the different strips, and the cooling deformation of the continuous annealing high-temperature section is reduced.
The invention effectively solves the problem of cooling deformation of the strip annealing high-temperature section (1080-900 ℃), reduces the internal stress of strip cooling and effectively controls the strip shape.
Claims (7)
1. The utility model provides an air slow cooling system that continuous annealing cooling of strip was used which characterized in that: consists of an air supply device (40), an air slow cooling device and an air exhaust device (50); the air slow cooling device comprises a box body (20) and a plurality of air slow cooling air knife structures arranged in the box body (20), wherein the air slow cooling air knife structures are symmetrically arranged in the box body (20) from top to bottom, and air injection ports of the upper air slow cooling air knife structure and the lower air slow cooling air knife structure are opposite to each other to form a bidirectional air slow cooling air injection structure with a workpiece as a center; the air slow cooling air knife structure is connected with the side wall of the box body (20) through a positioning and adjusting structure (7), so that the relative position of the upper air slow cooling air knife structure and the lower air slow cooling air knife structure can be adjusted; an air outlet (20-1) is formed in the top of the box body (20), and the air exhaust device (50) is arranged at the air outlet to form a forced air exhaust structure so as to exhaust hot air in the box body (20) from the air outlet (20-1); the air outlet end of the air supply device (40) is connected with the air inlets of the upper air slow cooling air knife structure and the lower air slow cooling air knife structure to form an adjustable air inlet structure; the process control structure of the continuous annealing cooling slow cooling section of the strip is formed by adjusting the air inlet flow and the air inlet pressure of the air slow cooling device and the distance from an air nozzle of an air slow cooling air knife structure to a workpiece; the distance between the strip-shaped nozzles (3) and the workpiece can be adjusted by adjusting the adjusting screw rods (7-3), so that the speed of wind sprayed by the strip-shaped nozzles (3) to the strip surface can be adjusted within a certain range, and the adjustment of the cooling speed is realized;
the air slow cooling air knife structure comprises an air pipe (1), wherein the front end of the air pipe (1) is provided with an air inlet (1-1), and the rear end of the air pipe is closed; the air knife structure is characterized in that air outlets (1-2) are formed in the side wall of the air pipe (1) along the length direction, the air outlets (1-2) are formed by strip-shaped notches formed in the side wall of the air pipe (1) along the length direction, two bent plates (2) are arranged at the air outlets (1-2), the air outlets (1-2) are surrounded through the bent plates (2) to form strip-shaped nozzles (3) with Y-shaped cross sections, and the centers of the strip-shaped nozzles (3) with the Y-shaped cross sections correspond to the centers of the air outlets (1-2) to form an air knife structure; an air spraying channel is formed in the inner cavity of the strip-shaped nozzle (3) with the Y-shaped cross section, the front section of the air spraying channel is expanded, the rear section of the air spraying channel is contracted, the front end of the strip-shaped nozzle (3) with the Y-shaped cross section is communicated with the air outlet (1-2), and the rear end of the strip-shaped nozzle is an air spraying port, so that a slow cooling type air knife structure with the functions of speed reduction and secondary acceleration is formed;
the width of the strip-shaped notch is W1=5mm-7mm, so that the speed of the air passing through the strip-shaped notch is correspondingly set; the two bent plates (2) are symmetrically welded on the air pipe (1) along the length direction of the air pipe (1) by taking the position of the strip-shaped notch as the center to form a gradually narrowed strip-shaped nozzle (3); the two bent plates (2) are bent inwards, the front section of the formed air spraying channel is in a large horn shape, the rear section of the formed air spraying channel is in a small horn shape, the included angle at the joint of the front section and the rear section is alpha = 120-150 degrees, and R arc transition is formed; two ends of the two bent plates (2) are welded through the flat plate (4) to form a structure with closed periphery;
the positioning and adjusting structures (7) are arranged at two ends of the air pipe (1), each positioning and adjusting structure (7) comprises one positioning plate (7-1) and two positioning plates (7-2), and each of the one positioning plate (7-1) and the two positioning plates (7-2) is provided with an adjusting screw rod (7-3); an angle steel (7-5) is arranged on the box body (20), an adjusting screw (7-3) penetrates through a through hole of the angle steel (7-5) and then is connected with a nut (7-4), and the first positioning plate (7-1) and the second positioning plate (7-2) are movably connected with the four clamping blocks (7-7) to form an up-and-down adjusting structure; after two ends of the air pipe (1) are welded and fixed with the first positioning plate (7-1) and the second positioning plate (7-2), the adjusting screw (7-3) is in threaded connection with the nut (7-4) through an opening of the angle steel (7-5); the first positioning plate (7-1) and the second positioning plate (7-2) are respectively connected with the box body (20) through a gasket (7-6) to form a sealing structure; the clamping blocks (7-7) are fastened to the box body (20) through bolts to form a positioning structure; the relative position of the angle steel (7-5) in the box body (20) is provided with a limiting block (7-8) to form a limiting structure.
2. The air slow cooling system for the continuous annealing and cooling of the strip material as claimed in claim 1, wherein: a plurality of exhaust baffles (13) are arranged at the air outlet of the box body (20), and the exhaust baffles (13) are connected in the inner cavity of the box body (20) through supporting plates (14); a gap with the width of 20mm is reserved between the adjacent exhaust baffles (13), and the distance W3 between the exhaust baffles (13) at the two sides and the wall of the inner cavity of the box body is 250mm, so that hot air is upwards extracted from the gaps between the exhaust baffles (13) and the two sides of the wall of the inner cavity of the box body; the air supply device (40) comprises an air blower (40-1) and an air regulating valve (40-2), the air outlet end of the air blower (40-1) is connected with the air inlet end of the air regulating valve (40-2) through a pipeline, the air outlet of the air regulating valve (40-2) is connected with the air inlet of the air slow cooling air knife structure to form an air supply and regulating structure, so that the air injection pressure and flow can be regulated; the air exhaust device (50) comprises an exhaust fan (50-1), and the exhaust fan (50-1) is communicated with an air outlet (20-1) at the top of the box body (20) through a pipeline.
3. The air slow cooling system for the continuous annealing and cooling of the strip material as claimed in claim 2, wherein: a valve (40-3) is arranged at the joint of the air outlet end of the blower (40-1) and the air regulating valve (40-2); the air slow cooling air knife structures are sequentially, equidistantly and transversely arranged in the box body (20) in a staggered manner along the running direction of the workpiece, and the distances from the upper air slow cooling air knife structure to the strip surface and the lower air slow cooling air knife structure to the strip surface are set and adjusted according to the cooling rate required by the process; two upper and lower air slow cooling air knife structures in opposite directions are a group, and each group of air slow cooling air knife structures are used for air inlet at the same side so as to form a structure with the consistency and the speed uniformity of air backpressure in the air pipe (1).
4. The air slow cooling system for the continuous annealing and cooling of the strip material as claimed in claim 1, wherein: the air outlet (1-2) is formed by strip-shaped notches arranged on the side walls of the air pipe (1) along the length direction, the length dimension of each strip-shaped notch is larger than the width dimension of a workpiece, and the length dimension of each strip-shaped nozzle (3) is equivalent to that of each strip-shaped notch; two flat plates (4) are respectively arranged at two ends of the bent plate (2), and the flat plates (4) and the end part of the bent plate (2) are welded, sealed and fixedly welded to the air pipe (1) to form an air knife air injection opening with the periphery closed.
5. The air slow cooling system for continuous annealing cooling of strip material as claimed in claim 4, wherein: in the strip-shaped nozzle (3), a plurality of coaxial circular holes are formed in the middle of the strip-shaped nozzle (3) along the length direction of the air pipe (1) on the two bent plates (2), and the strip-shaped nozzle (3) is fixed by welding through the coaxial circular holes of the two bent plates (2) which are penetrated by a round steel positioning block (5); at the outlet of the strip-shaped nozzle (3), a plurality of square steel positioning blocks (6) are distributed and welded to fix the strip-shaped nozzle (3) so as to ensure that the outlet gaps formed by the two bent plates (2) are W2=5mm-7mm in the same size, and the uniformity of the flow at the outlet is ensured.
6. The air slow cooling system for continuous annealing cooling of strip material as claimed in claim 1, wherein: the air slow cooling air knife structure supplies air in the same direction, one end of the air pipe (1) is provided with an air inlet, and the air inlet end is connected to the box body (20) through one of the positioning plates (7-1); the other end of the air pipe (1) is welded and sealed by a sealing plate (8), a round pipe (10) is welded on the outer side of the sealing plate (8) to be used as a positioning piece, and a plate rib (9) is welded at the joint of the round pipe (10) and the sealing plate (8) to form a reinforced connecting structure; and the circular tube (10) is welded with the inner side of the second positioning plate (7-2) through the sleeve 11 and is positioned on the box body.
7. The air slow cooling system for continuous annealing cooling of strip material as claimed in claim 1, wherein: a guide plate (12) is welded in the sleeve (11), and the sleeve (11) is fixedly connected with the circular tube (10) through the guide plate (12).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010135465.3A CN111394566B (en) | 2020-03-02 | 2020-03-02 | Air slow cooling system for continuous annealing and cooling of strip |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010135465.3A CN111394566B (en) | 2020-03-02 | 2020-03-02 | Air slow cooling system for continuous annealing and cooling of strip |
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| CN111394566B true CN111394566B (en) | 2022-10-28 |
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| CN114350914A (en) * | 2021-12-15 | 2022-04-15 | 中国科学院金属研究所 | Device and method for air-cooling uniform cooling in alloy furnace external heat treatment process |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| TW497710U (en) * | 2001-10-16 | 2002-08-01 | Intech Machines Co Ltd | Airing machine for plate-typed objects |
| KR100529055B1 (en) * | 2001-12-07 | 2005-11-15 | 주식회사 포스코 | Device for cooling strip in continuous annealing furnace |
| CN101571355B (en) * | 2009-06-01 | 2011-01-05 | 苏州中门子科技有限公司 | Strong loop quick cooling chamber |
| CN103206846A (en) * | 2013-03-22 | 2013-07-17 | 浙江精诚模具机械有限公司 | Air knife |
| CN203672091U (en) * | 2013-12-27 | 2014-06-25 | 宇宙电路板设备(深圳)有限公司 | Water-driving air knife capable of eliminating water-driving blind area |
| CN203960288U (en) * | 2014-06-17 | 2014-11-26 | 肇庆宏旺金属实业有限公司 | The air cooling equipment of annealing furnace |
| CN204019832U (en) * | 2014-08-13 | 2014-12-17 | 江苏安瑞达新材料有限公司 | A kind of malleation air blade device being applicable to lithium battery curtain coating basement membrane and producing |
| CN207823509U (en) * | 2017-12-21 | 2018-09-07 | 东莞市汉克机电科技有限公司 | A kind of adjustable type presses air knife |
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