CN112387554B - Method for eliminating missing coating lines of magnesium oxide coating on surface of HIB steel - Google Patents
Method for eliminating missing coating lines of magnesium oxide coating on surface of HIB steel Download PDFInfo
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- CN112387554B CN112387554B CN202011036445.7A CN202011036445A CN112387554B CN 112387554 B CN112387554 B CN 112387554B CN 202011036445 A CN202011036445 A CN 202011036445A CN 112387554 B CN112387554 B CN 112387554B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/28—Processes for applying liquids or other fluent materials performed by transfer from the surfaces of elements carrying the liquid or other fluent material, e.g. brushes, pads, rollers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C1/00—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating
- B05C1/04—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length
- B05C1/08—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line
- B05C1/0808—Details thereof, e.g. surface characteristics
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C1/00—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating
- B05C1/04—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length
- B05C1/08—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line
- B05C1/0813—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line characterised by means for supplying liquid or other fluent material to the roller
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
- B05C11/10—Storage, supply or control of liquid or other fluent material; Recovery of excess liquid or other fluent material
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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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1277—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties involving a particular surface treatment
- C21D8/1283—Application of a separating or insulating coating
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
Abstract
The invention provides a method for eliminating magnesium oxide coating missing lines on the surface of HIB steel, belonging to the field of high magnetic induction oriented silicon steel manufacturing and comprising the following steps: setting the diameter of a coating roller of a magnesium oxide coating machine at 350-550 mm; removing a liquid accumulation disc below a coating roller under the magnesium oxide coating machine; a magnesium oxide spraying system is arranged on one side of a lower coating roller of a magnesium oxide coating machine, and the magnesium oxide spraying system directly sprays magnesium oxide coating liquid onto the surface of the lower coating roller; and compressed air blowing devices are arranged on two sides between the coating rollers, and the two sides of the coating rollers are blown by the compressed air blowing devices. The method can greatly eliminate the missing coating lines of the magnesium oxide coating on the surface of the HIB steel, improve the insulating property of the HIB steel and has low cost for equipment modification.
Description
Technical Field
The invention belongs to the field of high magnetic induction grain-oriented silicon steel manufacturing, and relates to a method for eliminating missing coating lines of a magnesium oxide coating on the surface of HIB (high impact induction) steel.
Background
The transformer made of high magnetic induction oriented silicon steel (HIB steel) has the advantages of small volume, low noise and low loss, and is a preferred material for users. There are 2 processes for making HIB steel, the main difference being the slab heating temperature before hot rolling. One is high temperature high magnetic induction grain-oriented silicon steel (high temperature HIB steel) with a heating temperature of more than 1250 ℃ and subsequent processing. The other is heating temperature about 1100 ℃, and nitriding treatment is carried out in a post-process auxiliary, so that the steel is called low-temperature high-magnetic induction oriented silicon steel (low-temperature HIB steel). Because of low heating temperature, the energy consumption is obviously reduced, the thermal deformation generated during cooling is small, the edge quality is good, the post-processing processability is good, and the yield of steel is high. Based on the advantages, the low-temperature HIB steel gradually replaces the high-temperature HIB steel to become a mainstream product process.
With the promulgation and implementation of new national environmental protection laws, the demand for low-energy-consumption products is increasing. The low-temperature HIB steel can be selected as the material of the iron core of the low-energy transformer, but if the insulating layer on the surface of the material is defective, the phenomenon of short circuit and breakdown between the laminated sheets can occur, and the transformer is damaged. Therefore, the quality requirement of the insulating layer on the surface of the low-temperature HIB steel is high.
The main component of the good insulating layer on the surface of the low-temperature HIB steel is a glassy magnesium silicate film. It is derived from silicon dioxide generated by a steel plate in an annealing furnace of a continuous annealing unit, and is generated by reacting with magnesium oxide coated on the surface at high temperature. The quality of the magnesium oxide coating on the surface of the steel sheet is an important factor for determining the quality of the final magnesium silicate insulating film.
The magnesium oxide coating system of the low-temperature HIB steel mainly comprises a coating machine, a coating roller made of rubber, a magnesium oxide configuration and circulation system and a drying system. The coating roller with the surface grooves is arranged on a coating machine, and the upper and the lower coating rollers tightly press a steel plate running in the middle and passively rotate along with the steel strip. The magnesium oxide circulating system sprays magnesium oxide coating liquid on the steel plate, and the magnesium oxide coating liquid flows to the surface of the upper coating roller and the magnesium oxide coating liquid accumulation plate below the upper coating roller along with the steel plate. The lower coating roller is soaked in the liquid accumulating disc, and the magnesium oxide coating liquid is uniformly coated on the surface of the steel plate through the grooving along with the rotation of the coating roller.
In order to reduce the production cost and improve the operation efficiency, the process speed of the low-temperature HIB steel continuous annealing unit is gradually improved. After the annealing process speed exceeds 90 m/min, the coating surface has the following problems: firstly, the rotating speed of the coating roller is obviously improved, the accumulation and storage time of magnesium oxide coating liquid in the coating roller notch groove is shortened, the phenomenon that the coating roller notch groove is partially insufficient in liquid supply and cannot completely cover the surface of a steel plate is caused, and a missing coating line is generated on the surface of the steel plate; secondly, the scale of the magnesium oxide coating liquid in the liquid accumulation disc aggravates the abrasion of the lower coating roller soaked in the magnesium oxide coating liquid, and meanwhile, the magnesium oxide coating liquid in the notch groove of the lower coating roller is not easy to accumulate and store in the notch groove due to gravity, so that the liquid supply capacity of the notch groove is reduced, and a coating missing line is generated on the surface of the steel plate; thirdly, when the steel plate edge has edge waves and sawteeth, the abrasion of the notch grooves of the coating roller is increased, the notch grooves are accumulated to store magnesium oxide coating liquid, the coating leakage lines are easy to appear on the steel plate edge, and the phenomenon is aggravated when the width of the raw material is changed. The coating missing lines can move along with the spiral direction of the coating roller grooving, and the coating missing lines can appear on the surface of the whole steel plate in severe cases. For the reasons, the surface of the steel plate is easy to generate the defect of the coating missing line during high-speed coating.
In order to solve the above three problems, the diameter of the coating roller is generally increased to reduce the rotation speed of the coating roller, thereby increasing the accumulation storage time of the magnesium oxide coating solution on the coating roller. However, the large-diameter coating roller needs to be manufactured into a new large-diameter liquid accumulation disc to prevent interference with an old small-diameter liquid accumulation disc. The grooving depth of the coating roller can be increased, the grooving angle is enlarged, and the magnesium oxide coating liquid accumulation and storage capacity is improved. However, this method causes insufficient groove holding force and causes a groove collapse phenomenon in the case of a large pressing force. The macroscopic expression shows that the thickness of the steel plate is locally uneven, and in severe cases, a local large-area missing coating line appears. And a measure of stirring the liquid accumulation plate is also adopted, but due to the influence of the viscosity of the magnesium oxide coating liquid and the space of the liquid accumulation plate, the scale can be reduced only and cannot be completely avoided. For the problem of width change of raw materials, a method of switching and using double coating machines is adopted, but the modification cost of a machine set only provided with one coating machine is too high. It is not the best solution for most already built units.
Disclosure of Invention
In order to solve the technical problem that the magnesium oxide coating on the surface of the HIB steel has coating missing lines, the invention provides a method for eliminating the coating missing lines of the magnesium oxide coating on the surface of the HIB steel, the method can greatly eliminate the coating missing lines of the magnesium oxide coating on the surface of the HIB steel, the insulating property of the HIB steel is improved, and the cost of equipment modification is low.
The invention is realized by the following technical scheme:
a method for eliminating missing coating lines of a magnesium oxide coating on the surface of HIB steel comprises the following steps:
setting the diameters of an upper coating roller and a lower coating roller of a magnesium oxide coating machine to be 350-550 mm, wherein the depth of a groove engraved on the surface of each coating roller is 0.4-0.65 mm;
removing the liquid accumulation disc below the coating roller under the magnesium oxide coating machine;
a magnesium oxide spraying system is arranged on one side of a lower coating roller of a magnesium oxide coating machine, and the magnesium oxide spraying system directly sprays magnesium oxide coating liquid onto the surface of the lower coating roller;
and compressed air blowing devices are arranged on two sides of the coating roller, and the edges of the strip steel between the roll gaps of the coating roller are blown by the compressed air blowing devices.
Further, the surface grooving angle of the coating roller is 50-60 degrees, and the number of the grooving teeth is 22-25.
Furthermore, magnesium oxide spraying system includes the feed liquor pipe, and 3 spray pipes are linked to the feed liquor pipe, and spray pipe end connection shower nozzle, 3 shower nozzles aim at the middle part and the both sides of lower coating roller respectively.
Furthermore, the spray pipe is a DN25 spray pipe, a valve is arranged on the spray pipe, and the valve is a manual valve.
Furthermore, one end of the liquid inlet pipe is closed, the other end of the liquid inlet pipe is connected with a coating circulating pump of the magnesium oxide coating machine, and the spray pipe is connected to one side of the liquid inlet pipe.
Furthermore, the compressed air purging device comprises two compressed air pipes, the tail ends of the compressed air pipes are connected with compressed air nozzles, and the compressed air nozzles are aligned to edges on two sides of the strip steel between the roll gaps of the coating roller to purge.
Furthermore, a manual valve for adjusting the flow is arranged on the compressed air pipe, and one end of the compressed air pipe, which is far away from the compressed air nozzle, is connected with a compressed air main pipe of the magnesium oxide coating machine.
Furthermore, the included angle between the compressed air nozzle and the upper coating roller and the lower coating roller is 10-40 degrees.
Further, the air source pressure of the compressed air nozzle is 0.5-0.7MPa, and the flow rate is 1-3m3/h。
Further, the magnesium oxide coating machine is a two-roll coating machine.
One or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages:
the method for eliminating the missing coating lines of the magnesium oxide coating on the surface of the HIB steel has the advantages that the existing coating machine is not replaced, the existing coating machine is not added, the existing coating machine, the coating roller and the magnesium oxide coating liquid circulating system are locally transformed, the missing coating line defect caused by high-speed coating is eliminated, the missing coating line eliminating rate can reach more than 99% for the magnesium oxide coating process with the silicon steel plate width of 900-1250 mm and the running speed of 80-100m/min, the equipment investment is not remarkably increased, the transformation is carried out by utilizing the existing equipment conditions, and the cost is reduced.
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 are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 is a schematic representation of a coating roll modification of the present invention;
FIG. 2 is a schematic view of a magnesium oxide spray system of the present invention;
FIG. 3 is a schematic view of a compressed air purge arrangement of the present invention.
In the figure:
1-coating roller, 2-liquid accumulating disc, 3-magnesium oxide spraying system, 31-liquid inlet pipe, 32-spray pipe, 33-spray head, 4-compressed air blowing device, 41-compressed air pipe, 42-compressed air nozzle, 5-magnesium oxide coating machine, 51-coating circulating pump and 52-compressed air main pipe.
Detailed Description
The present invention will be described in detail below with reference to specific embodiments and examples, and the advantages and various effects of the present invention will be more clearly apparent therefrom. It will be understood by those skilled in the art that these specific embodiments and examples are for the purpose of illustrating the invention and are not to be construed as limiting the invention.
Throughout the specification, unless otherwise specifically noted, terms used herein should be understood as having meanings as commonly used in the art. Accordingly, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. If there is a conflict, the present specification will control.
Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or can be prepared by existing methods.
In order to solve the technical problems, the embodiment of the invention provides the following general ideas:
the invention aims to eliminate the defect of missing coating lines caused by high-speed coating by locally modifying the existing coating machine, a coating roller and a magnesium oxide coating liquid circulating system without replacing the existing coating machine or adding a new coating machine. The method does not increase equipment investment obviously, and utilizes the existing equipment conditions to reform, thereby reducing the cost.
Specifically, the method for eliminating the missing coating lines of the magnesium oxide coating on the surface of the HIB steel comprises the following steps:
setting the diameters of an upper coating roller and a lower coating roller of a magnesium oxide coating machine at 350-550 mm, wherein the depth of a groove on the surface of each coating roller is 0.4-0.65 mm;
removing a liquid accumulation disc below a coating roller under the magnesium oxide coating machine;
a magnesium oxide spraying system is arranged on one side of a lower coating roller of a magnesium oxide coating machine, and the magnesium oxide spraying system directly sprays magnesium oxide coating liquid onto the surface of the lower coating roller;
and compressed air blowing devices are arranged on two sides of the coating roller, and the edges of the strip steel between the roll gaps of the coating roller are blown by the compressed air blowing devices.
Further, the surface grooving angle of the coating roller is 50-60 degrees, and the number of the grooving teeth is 22-25.
The surface grooving of the coating roller can meet the required liquid carrying amount of the high-speed magnesium oxide coating by adopting the parameters, and the grooving has strong lodging resistance under high pressure.
Furthermore, magnesium oxide spraying system includes the feed liquor pipe, and 3 spray tubes are linked to the feed liquor pipe, and spray tube end connection shower nozzle, 3 shower nozzles aim at the middle part and the both sides of lower coating roller respectively. The spray tube is DN25 spray tube, is equipped with the valve on the spray tube, the valve is manual valve, adopts manual ball valve at present more, and gate valve, stop valve do, mainly play the effect of adjusting the spray tube flow. One end of the liquid inlet pipe is closed, the other end of the liquid inlet pipe is connected with a coating circulating pump of the magnesium oxide coating machine, and the spray pipe is connected to one side of the liquid inlet pipe.
Furthermore, the compressed air blowing device comprises two compressed air pipes, the tail ends of the compressed air pipes are connected with compressed air nozzles, and the compressed air nozzles are aligned with the two sides of the coating roller to blow air. And a manual valve for adjusting the flow is arranged on the compressed air pipe, and one end of the compressed air pipe, which is far away from the compressed air nozzle, is connected with a compressed air main pipe of the magnesium oxide coating machine. The included angle between the compressed air nozzle and the upper coating roller and the lower coating roller is 10-40 degrees.
Further, the air source pressure of the compressed air nozzle is 0.5-0.7MPa, and the flow rate is 1-3m3/h。
The aim of air injection is to break the surface tension of the magnesium oxide coating liquid at the roll gap by air flow, so that the magnesium oxide coating liquid can enter the notch groove of the coating roll and be coated on a steel plate conveniently, and the coating missing line is eliminated.
Through observation and research on the coating quality at different coating process speeds, the coating quality at low speed is obviously better than that at high speed. The coating roller has low rotating speed at low speed, the magnesium oxide coating liquid is accumulated and stored on the engraved groove of the coating roller for a long time, and the magnesium oxide coating liquid is distributed uniformly when being extruded on a steel plate. For this reason, increasing the diameter of the coating roller and decreasing the rotational speed are viable options. The diameter of the coating roller is selected to be 350-550 mm according to factors such as the process speed, the size and the bearing capacity of the coating machine, the steel strip elevation datum line and the like, the rotating speed of the coating roller can be reduced, and the purpose of reducing the probability of occurrence of coating missing lines through uniform coating can be achieved by matching with certain grooving parameters.
The invention selects the structure of the accumulation-eliminating liquid tray. This is because the first problem encountered in old coaters when replacing large diameter coating rolls is the interference of the drip pan of the lower coating roll. Capital must be expended to re-fabricate a new drip pan suitable for large diameter coating rolls. A new drip pan is fitted when a large diameter coating roller is used. However, there is a limitation that when the original small-diameter coating roller of the unit is used, the stirring capacity of the magnesium oxide coating liquid in the large liquid accumulation disc is reduced, the abrasion of the groove is accelerated due to the aggravation of magnesium oxide scaling, and the occurrence probability of the missing coating line is increased. Therefore, when coating rollers with different diameters are replaced, the matched liquid accumulating discs must be replaced synchronously, and the workload and the maintenance cost are increased. Moreover, the existence of the liquid accumulation disc still can not stop the problem of magnesium oxide scale formation, even because the size of the liquid accumulation disc is enlarged, the volume is enlarged, and the magnesium oxide scale formation is more likely to occur.
The problem that the lower coating roller supplies the magnesium oxide coating liquid can be faced after a lower coating roller liquid accumulation plate is eliminated. The inventor designs magnesium oxide spraying system, adopts brand-new mode to carry out the spraying magnesium oxide masking liquid to the lower coating roller, lets magnesium oxide masking liquid directly spray to the lower coating roller on, through the operation of coating roller with magnesium oxide masking liquid coating to the steel sheet lower surface. The specific measure is to add a branch on the outlet pipeline of the original coating circulating pump, and then install 3 jet pipes DN25 on the branch. The spray pipes are respectively aligned to the middle and two sides of the lower coating roller, and the 3 spray pipes are provided with manual valves, so that the flow of the magnesium oxide coating liquid sprayed onto the lower coating roller can be conveniently adjusted. The grooving abrasion of the lower coating roller is thoroughly eliminated due to the fact that no liquid is accumulated and the magnesium oxide coating liquid scales, and the probability of occurrence of coating missing lines is further reduced.
The compressed air blowing devices are arranged on two sides of the coating roller and used for eliminating coating missing lines on the steel plate. The inventors have observed that 70% of the skip-coated lines are first generated at both side portions of the steel sheet and then extend toward the middle of the steel sheet along the rotational direction of the engraved grooves of the coating roll. Further research finds that the main reason is that the edge of the steel plate is sharp and has fluctuated waves, the abrasion of the groove of the coating roller made of rubber is obviously larger than that of the middle of the steel plate, the capability of accumulating and storing the magnesium oxide coating liquid in the groove at the contact part of the coating roller and the edge of the steel plate is reduced, and the coating missing line is generated when the stored magnesium oxide coating liquid is not coated on the surface of the steel plate. Meanwhile, the magnesium oxide coating liquid has certain surface tension, and the magnesium oxide coating liquid which is lacked in the engraved grooves of the coating missing line part can not be filled rapidly and moves along the circumference along with the rotation of the coating roller, so that the coating missing line extends towards the middle of the steel plate in appearance. The balance can be broken by external force such as air injection or mechanical vibration, the magnesium oxide coating solution can enter the engraved groove of the coating roller, and the coating missing lines disappear. Therefore, a compressed air blowing device is added at the edge of the steel plate to eliminate the coating missing lines.
The compressed air blowing device is characterized in that a special compressed air pipeline is laid from a nearby compressed air main pipe and is provided with 2 manual valves, then two compressed air nozzles are installed on two sides of a coating roller, the parts of the edge of a steel plate where lines are not coated are blown by adjusting the angles of the nozzles and the manual valves of the compressed air, the surface tension of magnesium oxide coating liquid is broken through by external force, the magnesium oxide coating liquid can smoothly enter the engraved grooves on the edge of the coating roller, and therefore the generation of the lines which are not coated on the edge is eliminated.
The method for eliminating the skip-coating lines of the magnesium oxide coating on the surface of the HIB steel is described in detail in the following by combining the examples, the comparative examples and the experimental data.
Example 1
As shown in fig. 1-3, a method for eliminating the line of the magnesium oxide coating of the surface of the HIB steel, which comprises the following steps:
(1) setting the diameter of a coating roller 1 of a magnesium oxide coating machine 5 at 420mm, wherein the surface grooving depth of the coating roller 1 is 0.6mm, the surface grooving angle of the coating roller 1 is 53 degrees, and the number of grooving teeth is 40;
(2) removing the liquid accumulation disc 2 below the coating roller 1 under the magnesium oxide coating machine 5;
(3) a magnesium oxide spraying system 3 is arranged on one side of a lower coating roller 1 of a magnesium oxide coating machine 5, and the magnesium oxide spraying system 3 directly sprays magnesium oxide coating liquid onto the surface of the lower coating roller 1;
(4) and the compressed air blowing devices 4 are arranged on two sides of the coating roller 1, and the edges of the strip steel between the roll gaps of the coating roller 1 are blown by the compressed air blowing devices 4.
The magnesium oxide spraying system 3 comprises a liquid inlet pipe 31, the liquid inlet pipe 31 is connected with 3 spray pipes 32, the tail ends of the spray pipes 32 are connected with spray heads 33, and the 3 spray heads 33 are respectively aligned to the middle and two sides of the lower coating roller 1; the spray pipe 32 is a DN25 spray pipe, and a valve is arranged on the spray pipe 32 and is a manual valve; one end of the liquid inlet pipe 31 is closed, the other end of the liquid inlet pipe is connected with a coating circulating pump 51 carried by the magnesium oxide coating machine 5, and the spray pipe 32 is connected to one side of the liquid inlet pipe 31.
Further, the compressed air blowing device 4 comprises two compressed air pipes 41, the tail ends of the compressed air pipes 41 are connected with compressed air nozzles 42, and the compressed air nozzles 42 are aligned with the blowing air on the two sides of the coating roller 1; a manual valve for adjusting the flow is arranged on the compressed air pipe 41, and one end of the compressed air pipe 41, which is far away from the compressed air nozzle 42, is connected with a compressed air main pipe 52 of the magnesium oxide coating machine 5; the angle between the compressed air nozzle 42 and the upper and lower coating rollers 1 is 20 °.
Further, the air source pressure of the compressed air nozzle 42 is 0.6MPa, and the flow rate is 2m3/h。
Comparative example 1
This comparative example differs from example 1 in that: the existing magnesium oxide coating machine 5 was completely used without including (1) to (4) in example 1.
Comparative example 2
This comparative example differs from example 1 in that: the components (2) to (4) in example 1 were not included, and the rest was the same as those in the conventional magnesium oxide coating machine 5.
Comparative example 3
This comparative example differs from example 1 in that: the coating apparatus does not include (4) in example 1, and the remainder is the same as that of the conventional magnesium oxide coating apparatus 5.
Evaluation of Performance
The modified schemes of example 1 and comparative examples 1-3 are used for magnesium oxide coating on the surface of an HIB steel plate, the speed of a steel strip is tested to be 100m/min, the width of the steel strip is tested to be 1200mm, after the magnesium oxide coating on the surface of the HIB steel is coated, the missing coating line elimination rate of the magnesium oxide coating on the surface of the HIB steel is set to be 0 by taking the comparative example 1 as a reference standard, and the results of the example 1, the comparative examples 2 and 3 are compared with the results of the comparative example 1, and the results are shown in the following table:
as can be seen from the above table, compared with the comparison ratio 1, the elimination rate of the missing coating line of the magnesium oxide coating on the surface of the HIB steel in the embodiment 1 of the present invention can reach more than 99%, and the missing coating line of the magnesium oxide coating on the surface of the HIB steel is effectively eliminated, while the comparison ratios 2 and 3 also have the effect of eliminating the missing coating line of the magnesium oxide coating on the surface of the HIB steel to a certain extent, but the elimination rates have larger differences compared with the comparison ratio in the embodiment 1.
Finally, it should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including the preferred embodiment and all changes and modifications that fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (6)
1. A method for eliminating missing coating lines of a magnesium oxide coating on the surface of HIB steel is characterized by comprising the following steps:
setting the diameters of an upper coating roller (1) and a lower coating roller (1) of a magnesium oxide coating machine (5) at 350-550 mm, wherein the depth of a groove on the surface of each coating roller (1) is 0.4-0.65 mm;
removing the liquid accumulation disc (2) below the coating roller (1) under the magnesium oxide coating machine (5);
a magnesium oxide spraying system (3) is arranged on one side of a lower coating roller (1) of a magnesium oxide coating machine (5), and magnesium oxide coating liquid is directly sprayed to the surface of the lower coating roller (1) by the magnesium oxide spraying system (3);
arranging compressed air blowing devices (4) on two sides of the coating roller (1), and blowing the edges of the strip steel between the roll gaps of the coating roller (1) through the compressed air blowing devices (4);
the magnesium oxide spraying system (3) comprises a liquid inlet pipe (31), the liquid inlet pipe (31) is connected with 3 spray pipes (32), the tail ends of the spray pipes (32) are connected with spray heads (33), and the 3 spray heads (33) are respectively aligned to the middle part and two sides of the lower coating roller (1);
the spray pipe (32) is a DN25 spray pipe (32), a valve is arranged on the spray pipe (32), and the valve is a manual valve;
one end of the liquid inlet pipe (31) is closed, the other end of the liquid inlet pipe is connected with a coating circulating pump (51) carried by the magnesium oxide coating machine (5), and the spray pipe (32) is connected to one side of the liquid inlet pipe (31);
the compressed air purging device (4) comprises two compressed air pipes (41), the tail ends of the compressed air pipes (41) are connected with compressed air nozzles (42), and the compressed air nozzles (42) are aligned to edges of two sides of the strip steel between roll gaps of the coating roll (1) to purge.
2. The method for eliminating the missing coating lines of the magnesium oxide coating on the surface of the HIB steel according to claim 1, wherein the surface of the coating roller (1) is provided with a notching angle of 50-60 degrees and a notching tooth number of 22-25 degrees.
3. The method for eliminating the magnesium oxide coating missing lines on the surface of the HIB steel according to the claim 1, wherein a manual valve for adjusting the flow is arranged on the compressed air pipe (41), and one end of the compressed air pipe (41) far away from the compressed air nozzle (42) is connected with a compressed air main pipe (52) of the magnesium oxide coating machine (5).
4. The method for eliminating magnesium oxide coating skip lines on the surface of HIB steel as claimed in claim 1, wherein the angle between the compressed air nozzle (42) and the strip steel between the upper and lower coating rollers (1) is 10-40 °.
5. The method for eliminating the magnesium oxide coating skip lines on the surface of the HIB steel as claimed in claim 1, wherein the air source pressure of the compressed air nozzle (42) is 0.5-0.7MPa, and the flow rate is 1-3m3/h。
6. The method for eliminating the missing coating lines of the magnesium oxide coating on the surface of the HIB steel as claimed in claim 1, wherein the magnesium oxide coating machine is a two-roll coating machine.
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