CN111390570B - Method for mutual conversion between acid pickling coil and hot rolling leveling on acid leveling line - Google Patents
Method for mutual conversion between acid pickling coil and hot rolling leveling on acid leveling line Download PDFInfo
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- CN111390570B CN111390570B CN202010245229.7A CN202010245229A CN111390570B CN 111390570 B CN111390570 B CN 111390570B CN 202010245229 A CN202010245229 A CN 202010245229A CN 111390570 B CN111390570 B CN 111390570B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P23/00—Machines or arrangements of machines for performing specified combinations of different metal-working operations not covered by a single other subclass
- B23P23/06—Metal-working plant comprising a number of associated machines or apparatus
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B15/0085—Joining ends of material to continuous strip, bar or sheet
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D1/00—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling
- B21D1/02—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling by rollers
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G3/00—Apparatus for cleaning or pickling metallic material
- C23G3/02—Apparatus for cleaning or pickling metallic material for cleaning wires, strips, filaments continuously
- C23G3/021—Apparatus for cleaning or pickling metallic material for cleaning wires, strips, filaments continuously by dipping
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G3/00—Apparatus for cleaning or pickling metallic material
- C23G3/02—Apparatus for cleaning or pickling metallic material for cleaning wires, strips, filaments continuously
- C23G3/027—Associated apparatus, e.g. for pretreating or after-treating
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G3/00—Apparatus for cleaning or pickling metallic material
- C23G3/02—Apparatus for cleaning or pickling metallic material for cleaning wires, strips, filaments continuously
- C23G3/027—Associated apparatus, e.g. for pretreating or after-treating
- C23G3/029—Associated apparatus, e.g. for pretreating or after-treating for removing the pickling fluid from the objects
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B2015/0057—Coiling the rolled product
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B2015/0064—Uncoiling the rolled product
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- Optics & Photonics (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
The invention discloses a method for mutual conversion between acid pickling coil and hot rolling leveling on an acid leveling line, belonging to the field of steel production and comprising the steps of switching from hot rolling leveling coil to acid pickling coil and from acid pickling coil to leveling coil; the hot rolling flat coil-to-acid coil-washing process comprises the following steps: stopping the flat coil rotating pickling coil and turning the flat coil rotating pickling coil to a vehicle; the switching process of the acid pickling coil to the leveling coil comprises the following steps: stopping the acid-washing coil to be converted into a flat coil and lifting the acid-washing coil to be converted into the flat coil. The method realizes the switching production of the acid-washing coil and the hot-rolling flattening coil, realizes the function of flattening the thin hot-rolling coil and improving the shape of the plate, and improves the production efficiency of the unit.
Description
Technical Field
The invention relates to a steel production process, in particular to a novel process method for mutual conversion and centralized production of acid-washed coils and hot-rolled flat coils on an acid flat line.
Background
In order to comply with market conditions, a production line develops a thin hot rolled plate to realize hot cooling instead of cold, most products are delivered after being acid-washed and leveled, and a part of products are delivered directly after being produced. In the initial production stage, hot rolled plates are directly delivered, the plate shape problem brought forward by a user is frequent, and the brand image of the product is seriously influenced. Meanwhile, due to the process characteristics of the production line, the problem of plate shape of a thin hot rolled plate is always a technical problem. In order to solve the problem, the acceptance of users to hot rolled plates is improved, and the strip shape improvement of straight hair coils is very important.
The traditional hot rolling coil flattening is single-frame flattening, uncoiling, flattening and coiling are carried out, and the production efficiency is low. Therefore, based on the technical defects, a cold rolling and pickling leveling line is designed, and the aim is to improve the plate shape by leveling a thin hot rolled plate product after hydrochloric acid pickling. However, in the prior art, due to the functional limitations of finished coil diameter, electric interlocking of the pickling section and the like, the requirement that the hot rolled coil is not pickled and leveled can not be directly carried out. That is, the hot rolled coil leveling and the cold rolled pickling leveling must have their own production lines, causing huge waste of site, equipment, and personnel. How to realize that the acid pickling coil and the hot rolling flat coil can be mutually converted for centralized production, the production efficiency is improved, and the method becomes an important attack direction of enterprise competitiveness.
Disclosure of Invention
The technical task of the invention is to overcome the defects of the prior art, and realize the production of the hot rolled coil without pickling by using the mode of only using a phosphorus breaker or a leveler and a withdrawal and straightening machine on an acid flat line without using the pickling function through technical transformation on the basis of using the original pickling function on the acid flat line, thereby realizing the mutual conversion production of the pickled coil and the hot rolled coil without pickling and improving the shape of the thin hot rolled coil.
The technical scheme for solving the technical problem is as follows: a method for mutual conversion between acid pickling coil and hot rolling leveling on an acid leveling line is characterized by comprising the following steps: the method comprises the steps of switching from hot rolling flat coil to acid pickling coil and from acid pickling coil to flat coil;
the hot rolling flat coil-to-acid coil-washing process comprises the following steps: stopping the flat coil rotating pickling coil and turning the flat coil rotating pickling coil to a vehicle;
the step of turning the flat coil into the acid-washing coil to stop the flat coil comprises the following steps:
(1) before the machine is stopped, starting a small acid circulation of the pickling section, and checking the starting condition of the large acid circulation;
(2) when the welding seam of the flat coil and the parking coil reaches the outlet position of the rinsing tank of the rinsing section, the process section is stopped, and the cover of the pickling tank is closed;
(3) starting the acid liquor major cycle of the process section, and starting the process section;
(4) keeping the process section running until the welding seam reaches the outlet shear, and stopping the machine after the welding seam is cut off;
(5) 1 hour after the machine is stopped, opening the cover of the pickling tank and cleaning the process channel;
(6) dismounting the expanding sleeve of the coiling machine;
(7) closing the cascade valves among the circulation tanks, starting a waste acid pump of the 1 st circulation tank, and discharging acid liquid in the 1 st circulation tank;
(8) opening the gradient valve between the circulation tanks, and supplementing fresh acid through the 4 th circulation tank until the liquid level of each circulation tank reaches 75-80%;
the steps of the flat coil-to-acid cleaning coil-up trolley comprise:
(1) after the equipment sanitation and the process channel are cleaned, closing the pickling tank cover of the pickling section and the rinsing tank cover of the rinsing section to prepare for lifting;
(2) starting the vehicle at the outlet section, selecting to roll the wide-inner-diameter threading belt, and emptying the movable sleeve at the outlet after starting the vehicle;
(3) starting an acid liquor large circulation mode before starting the process section, and starting the process section;
(4) after the vehicle is started, the scale breaker is normally put into use;
the switching process of the acid pickling coil to the leveling coil comprises the following steps: stopping the acid pickling coil to be rolled into a leveling coil and turning the acid pickling coil to be rolled into a leveling coil:
the shutdown step of the acid-washing coil to the leveling coil comprises the following steps:
(1) after the vehicle is stopped and acid is discharged, the tank cover of the pickling tank is opened, the safety pin is inserted, the acid spray beam is washed, and the defogging fan is forbidden to be closed;
(2) increasing an expanding sleeve on the basis of an original reel of a coiling machine;
the step of turning the acid-washing coil to a leveling coil and turning up the vehicle comprises the following steps:
(1) the acid system in the acid cleaning central control system is not started; the squeezing roller of the pickling section is opened for operation; closing the cover of the pickling tank after the start-up production;
(2) closing the side spray of the rinsing section;
(3) adding a low-concentration leveling liquid into the leveling section, wherein the conductivity of the leveling liquid is controlled to be 100-;
(5) the oiler is not operated after exiting.
The acid leveling line comprises an uncoiler, an inlet shear, a welding machine, an inlet loop, a phosphorus breaking machine, an acid washing section, a rinsing section, a leveling machine, a tension leveler, an outlet loop, an oiling machine, an outlet shear and a coiling machine which are sequentially connected.
The pickling section is divided into 4 pickling tanks which are respectively named as a first acid tank, a second acid tank, a third acid tank and a fourth acid tank according to the sequence of strip steel entering the pickling tanks; the pickling tanks are mutually separated by a pair of acid squeezing rollers, and each pickling tank corresponds to one set of circulating tank: the acid tank with the same number and the circulation tank are provided with a large acid liquid circulation loop and a small acid liquid circulation loop; the acid liquor in the circulating tank is heated by a graphite heater through a pump and a pipeline and pumped into the corresponding acid tank, and then returns to the circulating tank from the acid tank to form a large circulation of acid washing; the acid liquor in the circulation tank is heated by the graphite heater through the pump and the pipeline, then does not pass through the acid tank, and directly returns to the circulation tank from another pipeline, so that the process is called as an acid liquor small circulation system.
The method for mutual conversion between acid pickling coil and hot rolling leveling on the acid leveling line is characterized by comprising the following steps of: the winding drum in the coiling machine comprises an inner drum and an expanding sleeve, wherein the expanding sleeve is a polyurethane expanding sleeve.
Compared with the prior art, the invention has the following outstanding beneficial effects:
1. the traditional hot rolling leveling only adopts a single-rack leveling machine to guarantee the strip shape, and a scale breaker, a leveling machine and a tension leveler on the transformation production line have the effect of improving the strip shape, so that the strip shape quality can be better guaranteed;
2. the traditional hot rolling flattening uncoiling, flattening and coiling processes have low production efficiency, the invention can be continuously produced after being transformed, does not need to be stopped in the middle, and has high production efficiency;
3. the method realizes the switching production of the acid-washing coil and the hot-rolling flattening coil, realizes the function of flattening the thin hot-rolling coil and improving the shape of the plate, and improves the production efficiency of a machine set; according to the production line, 7 ten thousand tons of hot rolling leveling coils are produced monthly, the ton steel benefit is 150 yuan, 5 ten thousand tons of pickling coils are produced, and the ton steel benefit is 200 yuan. The annual benefit is 2.46 billion yuan.
Drawings
FIG. 1 is a schematic composition of the present invention.
Detailed Description
The invention is further described with reference to the drawings and the detailed description.
The hardware of the invention relies on redesigning the acid leveling technical equipment to realize the switching production of acid pickling coils and hot rolling leveling coils. The technical process comprises the following steps: loading → uncoiling → shearing → welding → inlet loop → descaler → acid washing/no acid washing → rinsing → leveling → straightening → outlet loop → oil coating/no oil coating → shearing → coiling.
As shown in figure 1, the acid leveling line comprises an uncoiler 1, an inlet shear 2, a welding machine 3, an inlet loop 4, a phosphorus breaker 5, an acid washing section 6, a rinsing section 7, a leveling machine 8, a withdrawal and straightening machine 9, an outlet loop 10, an oiling machine 11, an outlet shear 12 and a coiling machine 13 which are connected in sequence. The following description of the invention is directed to the basic acid leveling line, and the rest of the unit is different according to different production lines and is not limited.
The acid washing section 6 is divided into 4 acid washing tanks which are respectively named as a first acid tank, a second acid tank, a third acid tank and a fourth acid tank according to the sequence of strip steel entering the acid tanks. The pickling tanks are mutually separated by a pair of acid squeezing rollers, and each pickling tank corresponds to one set of circulating tank: the first circulation tank, the second circulation tank, the third circulation tank and the fourth circulation tank are used for ensuring the supply of acid liquor, and acid liquor circulation exists between the acid tanks with the same number and the circulation tanks. The circulation tanks are also used as acid liquor collection tanks, and each circulation tank is communicated with the other circulation tanks and is controlled by a valve and a liquid level, so that the acid liquor in the fourth circulation tank flows towards the third circulation tank, the second circulation tank and the first circulation tank without a cascade. Ensures that the concentration of each circulating tank is from high to low, therefore, the acid concentration of the first circulating tank is the lowest and is also the circulating tank for discharging waste acid. Once the strip is temporarily stopped, the acid liquor of the pickling tank can be discharged into the corresponding circulating tank.
The above recycle tank and acid tank form two pickling cycles: large circulation of acid liquor and small circulation of acid liquor.
Acid liquor large circulation: the acid liquor in the circulating tank is heated by a graphite heater through a pump and a pipeline and pumped into the corresponding acid tank, and then returns to the circulating tank from the acid tank to form a large circulation of acid washing.
Acid liquor small circulation: the acid liquor in the circulating tank is heated by the graphite heater through the pump and the pipeline, and then does not pass through the acid tank, and directly returns to the circulating tank from another pipeline, so that the process is called as an acid liquor small circulating system.
And a liquid level meter is arranged in each circulation tank. There is a conductivity meter between the first recycle tank and the acid valve of the acid discharge path. And a conductivity meter is arranged between the fourth circulation tank and the acid valve of the acid inlet passage.
The data of the liquid level meter and the conductivity meter are in data connection with a pickling central control system, and various valves, acid valves, gradient valves and the like in the pickling section are controlled to be opened and closed remotely by the central control system. The hardware connection and software configuration of the central control system are set in the prior art, and the specific data processing mode is different according to different suppliers, which are well known in the art and will not be described again here. The central control system can realize the interlocking shielding of the acid system during the production of hot rolling flat coils, namely, the process section can also normally start to operate when the acid system is not started, and the interlocking shielding of the acid system is linked with the stretching operation of the drying rollers of the pickling section.
The winding drum in the coiling machine 13 comprises an inner drum and an expanding sleeve, wherein the expanding sleeve is a polyurethane expanding sleeve. The inner diameter of the current hot-rolled flat coil is 740-760mm, and the diameter of the pickling coil winding drum is 580-610mm, so that the switching of production of the coiler by switching the inner diameter of 760mm (hot-rolled coil) and the inner diameter of 610mm (pickling coil) needs to be realized through the design of a detachable expanding sleeve on the coiler winding drum.
A specific embodiment of a method for converting acid pickling coil and hot rolling leveling into each other on an acid leveling line is as follows.
Example 1, hot rolled flat coils were converted to acid pickled coils. In this example, the technical solution of pickling rolls was adopted: loading → uncoiling → shearing → welding → inlet loop → descaler → acid washing → rinsing → leveling → straightening → outlet loop → oiling → shearing → coiling.
1. Flat coil to acid pickling coil shutdown
(1) Before the machine is stopped, acid liquor small circulation of the acid washing section is started, and the starting condition of the acid liquor large circulation is checked.
(2) When the welding seam of the flat coil and the parking coil reaches the outlet position of the rinsing tank of the rinsing section 7, the process section is stopped, and the cover of the pickling tank is closed.
(3) Starting the acid liquor major cycle of the process section, and starting the process section at the speed of 60 m/min.
(4) The process section is kept running until the weld reaches the exit shear 12, and the machine is stopped after the weld is cut off. In the optimization scheme, the operation is slow.
(5) And (4) opening a cover of the pickling tank 1 hour after the machine is stopped, and cleaning the process channel according to the switching requirement of the flat coil to the pickling coil. The method specifically comprises the following steps: the staff checks and cleans the dust of the pickling tank, the rinsing tank, the dryer, the temper mill nozzle and all the on-line process roller systems and frames in a centralized manner, and checks and cleans the conditions of the oil coater knife beam, the oil tank and the filter element.
(6) And (4) dismounting the diameter-expanding sleeve of the coiling machine 13, and checking gaps among a mandrel and a bottom arm of the coiling machine and a coiling-assistant belt.
(7) Closing the cascade valves among the circulation tanks, and opening the waste acid pump of the 1 st circulation tank to discharge the acid liquor in the 1 st circulation tank by 30m 3.
(8) Opening the gradient valve between the circulation tanks, and replenishing new acid through the 4 th circulation tank until the liquid level of each circulation tank reaches 75-80%.
The operation requires 9 hours of process shutdown.
The process section is a general name of the pickling section and the rinsing section, and the following process channels are also referred to as the pickling section and the rinsing section.
2. Flat coil acid-washing coiling vehicle
(1) After the sanitation of the equipment and the process channel are cleaned, the pickling tank cover of the pickling section 6 and the rinsing tank cover of the rinsing section 7 are closed to prepare for lifting.
(2) The outlet section is started, the threading belt with the coiling width and the inner diameter (762mm) is selected, and the outlet loop sleeve is emptied after the starting.
(3) And opening a large acid liquor circulation mode before the start of the process section. After the large circulation state is operated for 3min, the process section is slowly started at the speed of 60-80m/min, and the amount of the outlet sleeve is always kept less than 20%.
(4) After the start of the train, the scale breaker 5 is normally used, the leveler 8 and the tension leveler 9 are not used for the moment, and the leveler 8 and the tension leveler 9 are used when the tail of the remaining strip of the stopped train is 100m to adjust the strip shape.
And after the parking coil is off-line, the parking coil is repaired and produced again by acid pickling, the operation aims to ensure that the parking coil is mainly used for transition and is not standard operation, so that the quality defect exists, the parking coil is transferred to a feeding position again after being off-line and produced again on an acid leveling machine set, and the parking coil is frequently produced on the machine set to clean dirt on the surface of the roller. And (3) selecting wide inner diameter (762mm) to coil after stopping the coil, using a traveling crane to hoist and transport the coil back to an inlet for pickling again when the shift is finished, selecting 610mm inner diameter to coil at an outlet until no cold rolling quality defect exists, and removing the diameter-expanded sleeve of another coiling machine. And after the diameter-expanding sleeve of the coiling machine 13 is removed, the double-coiling production is recovered.
And (3) stopping the process after the flat coil is rotated to the acid-washing coil and runs for 2-3 days, checking and cleaning a rinsing tank nozzle and a rinsing tank rear roller system, and checking and cleaning the conditions of a knife beam, an oil tank and a filter element of an oiling machine.
Example 2 acid wash to flat roll switch. In this embodiment, the technical scheme of hot rolling and flattening is adopted: loading → uncoiling → shearing → welding → inlet loop → descaler → rinsing → leveling → straightening → outlet loop → shearing → coiling. I.e. no pickling, no oiling. The specific procedures for switching from acid pickling coil to leveling coil are as follows:
1. acid pickling coil is changeed and is leveled a roll and shut down
(1) After the vehicle is stopped and acid is discharged, the tank cover of the pickling tank is opened, the safety pin is inserted, the acid spray beam is washed, and the defogging fan is forbidden to be closed;
(2) a polyurethane expanding sleeve is added on the basis of an original reel of a coiler 13 to realize the switching of the inner diameter of a hot-rolled coil of the coiler by 760 mm.
Wherein, the parking roll can be selected from a pickling roll without order, the inner diameter of the roll 762, and the lower line judgment and the re-pickling.
2. Pickling is rolled up and is changeed level rolling car
(1) When hot rolling and flattening are carried out in production, an acid system in the acid washing central control system is not started, specifically, the acid system is subjected to interlocking shielding, namely, a process section can also be started normally to run when the acid system is not started. And (5) opening the squeezing roller of the pickling section for operation. And closing the cover of the pickling tank after 3 shifts of the start-up production.
(2) The rinsing section has the main functions of cleaning residual acid liquor and chloride ions on the surface of the strip steel and ensuring the surface quality of the steel plate of the pickling winding belt, and the hot-rolled flat coil only needs to clean foreign matters on the surface, so that side spraying can be closed to save desalted water, and an operator needs to manually close an electromagnetic valve on an operation picture to realize the purpose.
(3) In the leveling section, the traditional hot rolled coil is only leveled dry, the abrasion of the roller is serious, and the wet leveling hot rolled coil is adopted in the transformation, so that the roller consumption is reduced. The method specifically comprises the steps of adding a low-concentration leveling solution into a leveling section, wherein the leveling solution can be a commercially available finished product leveling solution, the conductivity target of the leveling solution is controlled to be 100-200us/cm, and the leveling solution plays a role in lubrication and cleaning. The kilometer number of the roller in the dry leveling process is 80Km, and the kilometer number of the roller in the wet leveling process is increased to 120Km, so that the use efficiency and the operation rate of the roller are improved.
(6) During operation of the hot-rolled flattened coil, the oiler 11 is withdrawn from operation.
The various data of the product obtained by the acid flat line hot rolling flat coil/acid pickling cold forming coil process are as follows:
it should be noted that while the invention has been described in detail with respect to specific embodiments thereof, it will be apparent to those skilled in the art that various obvious changes can be made therein without departing from the spirit and scope of the invention.
Claims (4)
1. A method for mutual conversion between acid pickling coil and hot rolling leveling on an acid leveling line is characterized by comprising the following steps: the method comprises the steps of switching from hot rolling flat coil to acid pickling coil and from acid pickling coil to flat coil;
the hot rolling flat coil-to-acid coil-washing process comprises the following steps: stopping the flat coil rotating pickling coil and turning the flat coil rotating pickling coil to a vehicle;
the step of turning the flat coil into the acid-washing coil to stop the flat coil comprises the following steps:
(1) before the machine is stopped, starting a small acid circulation of the pickling section, and checking the starting condition of the large acid circulation;
(2) when the welding seam of the flat coil and the parking coil reaches the outlet position of the rinsing tank of the rinsing section, the process section is stopped, and the cover of the pickling tank is closed;
(3) starting the acid liquor major cycle of the process section, and starting the process section;
(4) keeping the process section running until the welding seam reaches the outlet shear, and stopping the machine after the welding seam is cut off;
(5) 1 hour after the machine is stopped, opening the cover of the pickling tank and cleaning the process channel;
(6) dismounting the expanding sleeve of the coiling machine;
(7) closing the cascade valves among the circulation tanks, starting a waste acid pump of the 1 st circulation tank, and discharging acid liquid in the 1 st circulation tank;
(8) opening the gradient valve between the circulation tanks, and supplementing fresh acid through the 4 th circulation tank until the liquid level of each circulation tank reaches 75-80%;
the steps of the flat coil-to-acid cleaning coil-up trolley comprise:
(1) after the equipment sanitation and the process channel are cleaned, closing the pickling tank cover of the pickling section and the rinsing tank cover of the rinsing section to prepare for lifting;
(2) starting the vehicle at the outlet section, selecting to roll the wide-inner-diameter threading belt, and emptying the movable sleeve at the outlet after starting the vehicle;
(3) starting an acid liquor large circulation mode before starting the process section, and starting the process section;
(4) after the vehicle is started, the scale breaker is normally put into use;
the switching process of the acid pickling coil to the leveling coil comprises the following steps: stopping the acid pickling coil to be rolled into a leveling coil and turning the acid pickling coil to be rolled into a leveling coil:
the shutdown step of the acid-washing coil to the leveling coil comprises the following steps:
(1) after the vehicle is stopped and acid is discharged, the tank cover of the pickling tank is opened, the safety pin is inserted, the acid spray beam is washed, and the defogging fan is forbidden to be closed;
(2) increasing an expanding sleeve on the basis of an original reel of a coiling machine;
the step of turning the acid-washing coil to a leveling coil and turning up the vehicle comprises the following steps:
(1) the acid system in the acid cleaning central control system is not started; the squeezing roller of the pickling section is opened for operation; closing the cover of the pickling tank after the start-up production;
(2) closing a side spraying electromagnetic valve of the rinsing section;
(3) adding a low-concentration leveling liquid into the leveling section, wherein the conductivity of the leveling liquid is controlled to be 100-;
(4) the oiler is not operated after exiting.
2. The method of claim 1 for interconverting acid flat on-line acid pickling coil and hot rolling flat, characterized in that: the acid leveling line comprises an uncoiler, an inlet shear, a welding machine, an inlet loop, a phosphorus breaking machine, an acid washing section, a rinsing section, a leveling machine, a tension leveler, an outlet loop, an oiling machine, an outlet shear and a coiling machine which are sequentially connected.
3. The method of claim 2 for interconverting acid flat on-line acid pickling coil and hot rolling flat, characterized in that: the pickling section is divided into 4 pickling tanks which are respectively named as a first acid tank, a second acid tank, a third acid tank and a fourth acid tank according to the sequence of strip steel entering the pickling tanks; the pickling tanks are mutually separated by a pair of acid squeezing rollers, and each pickling tank corresponds to one set of circulating tank: the acid tank with the same number and the circulation tank are provided with a large acid liquid circulation loop and a small acid liquid circulation loop; the acid liquor in the circulating tank is heated by a graphite heater through a pump and a pipeline and pumped into the corresponding acid tank, and then returns to the circulating tank from the acid tank to form a large circulation of acid washing; the acid liquor in the circulation tank is heated by the graphite heater through the pump and the pipeline, then does not pass through the acid tank, and directly returns to the circulation tank from another pipeline, so that the process is called as an acid liquor small circulation system.
4. The method of claim 2 for interconverting acid flat on-line acid pickling coil and hot rolling flat, characterized in that: the winding drum in the coiling machine comprises an inner drum and an expanding sleeve, wherein the expanding sleeve is a polyurethane expanding sleeve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| CN114277380B (en) * | 2021-12-31 | 2023-12-05 | 中冶赛迪工程技术股份有限公司 | Rapid switching system and method for production of pickling flat rolls and black flat rolls |
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Denomination of invention: A method for mutual conversion between pickling coil and hot rolling leveling on acid leveling line Effective date of registration: 20211222 Granted publication date: 20210706 Pledgee: Rizhao Bank Co., Ltd Pledgor: RIZHAO BAOHUA NEW MATERIAL CO.,LTD. Registration number: Y2021980015871 |