CN113798981A - Method for quickly eliminating furnace roller surface nodules - Google Patents
Method for quickly eliminating furnace roller surface nodules Download PDFInfo
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- CN113798981A CN113798981A CN202111003428.8A CN202111003428A CN113798981A CN 113798981 A CN113798981 A CN 113798981A CN 202111003428 A CN202111003428 A CN 202111003428A CN 113798981 A CN113798981 A CN 113798981A
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- furnace
- roller
- steel strip
- furnace roller
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B27/00—Other grinding machines or devices
- B24B27/033—Other grinding machines or devices for grinding a surface for cleaning purposes, e.g. for descaling or for grinding off flaws in the surface
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B49/00—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation
- B24B49/006—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation taking regard of the speed
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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
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention discloses a method for quickly eliminating furnace roller surface nodules, which comprises the following steps of S1: finding that roll marks appear on the surface of the steel strip; s2: locking the position of the furnace roller carrying the nodules; s3: controlling the differential rotation of adjacent furnace rollers or the accelerated rotation of a single furnace roller in the roller group of the area where the accretion is located by using a control console; s4: and (5) observing whether the roll marks on the steel strip disappear, if so, resuming the production, and if not, returning to the step S3. The method can quickly eliminate the accretion in the furnace without opening the continuous annealing furnace, quickly treat the accretion, ensure the continuous production and reduce the cost for treating the accretion.
Description
Technical Field
The invention belongs to the field of cold rolling continuous annealing heat treatment, and particularly relates to a method for quickly eliminating furnace roller surface nodules.
Background
The annealing treatment of the cold-rolled strip steel is an important component of the production process of the cold-rolled sheet and is a core equipment unit of the whole continuous annealing, and the mechanical property of the product is directly influenced by the quality of the annealing quality. The continuous annealing unit is a continuous automatic production line consisting of a plurality of furnace roller sets with different roller diameters. During production, the front and the rear coils of the strip steel are welded together by a welding machine for continuous production. The whole annealing process comprises a preheating section, a heating section, a soaking section, a slow cooling section, a fast cooling section, an overaging section, a final cooling section and a water quenching section, wherein the strip steel continuously runs in the furnace by taking furnace rollers as carriers, but the furnace rollers with different roller diameters in the furnace are numerous, and each furnace roller is in contact with the strip steel, so that each furnace roller can possibly cause the strip steel to generate roller marks.
In general, the furnace mark on the surface of the steel strip is formed by adhering slag adhered to a weld or a tilted skin generated by hot rolling to the surface of a furnace roller during production, and the furnace roller generates periodic furnace roller marks on the surface of the steel strip when the steel strip is conveyed. Because the furnace chamber in the continuous annealing furnace belongs to a sealed space and is filled with nitrogen and hydrogen, people cannot enter the furnace to treat accretion. Thus, once a roll mark is formed on the surface of the steel strip, it is generally undesirable to produce a batch product. If the accretion can not be treated on line, the furnace needs to be opened, the manual work enters the furnace for treatment, the cost of each time of opening and drawing is about 30 ten thousand, and huge economic loss is caused.
Disclosure of Invention
1. Problems to be eliminated
Aiming at the problems in production, the invention provides a method for quickly eliminating accretions in a furnace without opening a continuous annealing furnace, so that the accretions are quickly treated, and the continuous production is ensured.
2. Technical scheme
In order to eliminate the problems, the invention adopts the following technical scheme:
the invention provides a method for quickly eliminating furnace roller surface nodules, which comprises the following steps of S1: finding that roll marks appear on the surface of the steel strip; s2: locking the position of the furnace roller carrying the nodules; s3: controlling the differential rotation of adjacent furnace rollers or the accelerated rotation of a single furnace roller in the roller group of the area where the accretion is located by using a control console; s4: and (5) observing whether the roll marks on the steel strip disappear, if so, resuming the production, and if not, returning to the step S3.
Preferably, in step S2, the length of the adjacent roll mark on the steel strip carrying the roll mark is measured, the diameter of the furnace roll bonded with the nodule is calculated based on the length, and the position of the furnace roll carrying the nodule is locked with reference to the diameter table.
Preferably, in the step S3, the differential rotation means that the control console is used to regulate the rotation speed of the furnace roller carrying the nodule and the furnace roller adjacent to the furnace roller in the roller group, so that the rotation speed of the furnace roller at the front part is greater than that of the furnace roller at the rear part to increase the tension of the steel strip, and the nodule is pressed into the steel strip when the furnace rollers rotate and is separated from the furnace roller along with the movement of the steel strip.
Preferably, the variable speed rotation means that the furnace roller carrying the nodules is accelerated to increase or reduce the rotation speed to generate relative displacement with the steel strip, so as to assist the nodules pressed into the steel strip to be separated from the furnace roller.
Preferably, the speed difference of the adjacent furnace rollers in differential rotation is 0.05-1 m/s.
Preferably, the acceleration of the variable acceleration rotation of the single furnace roller is 0.05-0.15 m/s2。
Preferably, the step S3 is replaced with the step S5, and S6: and driving a steel belt to axially and reciprocally swing along the furnace roller by using the deviation rectifying roller in the roller group, and pushing nodules to axially move along the furnace roller by the periodically swinging steel belt until the nodules fall off from the edge of the furnace roller.
Preferably, the step S3 is replaced with the step S6, and S6: and controlling the roller group to repeatedly change the rotation direction of the furnace roller so that the steel belt repeatedly establishes or unloads tension in the roller group, and in the process, the accretion falls off due to repeated friction with the steel belt.
Preferably, after the step of S1, the steel strip transport speed is reduced, and the annealing furnace temperature is correspondingly reduced.
Preferably, the method is used in a continuous annealing furnace to remove the accretions on the furnace rollers.
3. Advantageous effects
Compared with the prior art, the invention has the beneficial effects that:
(1) the invention provides a method for quickly eliminating furnace roller surface nodules, which comprises the following steps of S1: finding that roll marks appear on the surface of the steel strip; s2: locking the position of the furnace roller carrying the nodules; s3: controlling the differential rotation of adjacent furnace rollers or the accelerated rotation of a single furnace roller in the roller group of the area where the accretion is located by using a control console; s4: and (5) observing whether the roll marks on the steel strip disappear, if so, resuming the production, and if not, returning to the step S3.
The nodules are removed from the furnace rolls using differential rotation of adjacent furnace rolls using the interaction between the steel strip and the nodules. The roller mark can be eliminated on the premise of not opening the annealing furnace, the production can be quickly recovered, and the economic loss is reduced. The furnace roller carrying the nodules and the rotating speed of the furnace roller adjacent to the furnace roller are arranged between the steel strip and the nodules, so that the tension of the steel strip in the area is increased, and the harder nodules are pressed into the steel strip and move along with the steel strip to be separated from the furnace roller. The method can quickly and effectively remove hard nodules from the furnace roller.
And after the tension is increased, controlling the furnace roller carrying the nodules to move in an accelerated manner, so that relative displacement is generated between the furnace roller and the steel strip, and the nodules on the furnace roller are separated from the furnace roller due to the shearing of the steel strip. This method removes nodules that, although pressed into the steel strip, could not follow the strip off the furnace rolls.
(2) The roller set is provided with a deviation rectifying roller which has the capability of rectifying the position of the steel strip on the furnace roller, so that the deviation rectifying roller can be utilized to drive the steel strip to reciprocate on the furnace roller along the axial direction of the furnace roller, and the steel strip pushes the accretion to axially move along the furnace roller until the accretion drops on the furnace roller. The method is suitable for the nodules with low hardness, the nodules cannot be pressed into the steel strip, and the nodules can be removed from the surface of the furnace roller only in a friction pushing mode.
(3) And controlling the roller group to repeatedly change the rotation direction of the furnace rollers so that the steel belt establishes or releases tension on the roller group. In the process, when the steel strip is about to be separated from the roller group, the steel strip is only contacted with the nodules, at the moment, the furnace roller rotates, and the nodules fall off due to friction between the furnace roller and the steel strip. This operation is repeated until the nodules fall off.
Drawings
FIG. 1 is a flow chart of the method for removing the watermark;
FIG. 2 is a partial schematic view of a roll stack according to the present invention;
FIG. 3 is a schematic view of the nodules on the furnace rolls being pressed into the steel strip;
FIG. 4 is a schematic diagram of the deviation rectifying roller driving the steel strip to move and the nodule to move;
FIG. 5 is a schematic view of a tension building;
FIG. 6 is a schematic de-tensioning view;
in the figure:
1. a roller set; 11. a furnace roller; 12. a deviation rectifying roller;
2. nodulation;
3. a steel strip.
Detailed Description
The following detailed description of exemplary embodiments of the invention refers to the accompanying drawings, which form a part hereof, and in which is shown by way of illustration exemplary embodiments in which the invention may be practiced. Although these exemplary embodiments are described in sufficient detail to enable those skilled in the art to practice the invention, it should be understood that other embodiments may be realized and that various changes to the invention may be made without departing from the spirit and scope of the present invention. The following more detailed description of the embodiments of the invention is not intended to limit the scope of the invention, as claimed, but is presented for purposes of illustration only and not limitation to describe the features and characteristics of the invention, to set forth the best mode of carrying out the invention, and to sufficiently enable one skilled in the art to practice the invention. Accordingly, the scope of the invention is to be limited only by the following claims.
The following detailed description is made in conjunction with the accompanying drawings:
in the production process, the nitrogen and the hydrogen in the continuous annealing furnace are filled in the whole furnace chamber and belong to a sealed space, so that the nitrogen and the hydrogen cannot enter the furnace to treat the accretion 2. Therefore, the method needs to remove the accretions 2 adhered to the surface of the furnace roller 11 on line without stopping production, and avoids the phenomenon that the steel strip 3 generates furnace marks on the surface for a long time, is unqualified and causes huge economic loss. The invention provides a technical scheme for rapidly eliminating accretions 2 on the surface of a furnace roller 11, which aims to solve the problems.
The first embodiment is as follows:
the preparation method comprises the following steps:
when the continuous annealing furnace normally runs, surface appearance detection equipment or manual work finds that roll marks exist on the surface of a steel strip (the material is SPCC, a cold-rolled carbon steel sheet and the steel strip) 3, the transmission speed of the steel strip 3 is reduced, the temperature of the continuous annealing furnace is reduced in a mode of reducing a fire nozzle, and the like, wherein the speed is reduced so as to reduce the yield of bad steel strips 3, correspondingly reduce the temperature of the annealing furnace, avoid the steel strip 3 from being overheated and melted due to the reduction speed, and the normally produced steel strip has the thickness of 0.1-3.0 mm and the width of 500-1800 mm.
Manually cutting a part of the steel strip 3 carrying the roller mark, grabbing the part of the steel strip 3 to a quality inspection platform, measuring the length of the adjacent roller mark on the surface of the steel strip 3, wherein the length is the circumference of the cross section circle of the furnace roller 11, calculating the diameter of the furnace roller 11 carrying the nodule 2 according to the circumference of the circle, and then comparing the diameter with a roller diameter table (a furnace roller 11 diameter table) recorded in the continuous annealing furnace equipment specification, so that the position of the furnace roller 11 carrying the nodule 2 in the continuous annealing furnace can be locked.
Removing the printing:
(1) and (3) controlling adjacent furnace rollers carrying the nodules in the roller group to remove the nodules in a differential rotation mode:
each process section is provided with a separate roller group 1 for driving the steel strip 3 to convey, and the roller group 1 comprises a plurality of furnace rollers 11. After the furnace roller 11 carrying the nodules 2 is found, the rotating speed and the rotating direction of the roller group 1 in the area are manually regulated and controlled on a control console of the continuous annealing furnace, so that the steel belt 3 and the nodules 2 are prompted to interact, and the nodules 2 on the furnace roller 11 are removed by the steel belt 3.
And (3) regulating the roller group 1 of the area where the accretion 2 is located, so that the rotating speeds of the front furnace roller 11 and the rear furnace roller 11 in the roller group 1 are different (the accretion 2 is located in the front furnace roller 11 or the rear furnace roller 11), and when the rotating speed of the front furnace roller 11 is greater than that of the rear furnace roller 11, continuously increasing the tension of the steel strip 3 due to the rotating speed difference between the front furnace roller and the rear furnace roller. When the furnace roller 11 carrying the nodules 2 continues to drive the steel strip 3 to convey, the nodules 2 can be completely pressed into the steel strip 3 and separated from the furnace roller 11 along with the conveying of the steel strip 3.
In a specific operation mode, each furnace roller 11 is divided into an operation side and a transmission side, bearings are arranged on the two sides, and the furnace rollers 11 are arranged in the bearings. The transmission side of each furnace roller 11 is connected with a variable frequency motor (controlling the furnace roller 11 to rotate at variable speed) through a coupler, each motor is provided with a speed measuring encoder, the speed measuring encoder is generally connected with the furnace roller 11 shaft, and when the furnace roller 11 shaft rotates, the speed measuring encoder outputs a pulse signal and transmits the pulse signal to a PLC (programmable logic controller) (located in a control console). And calculating and regulating the speed of the corresponding furnace outlet roller 11 according to the total pulse amount received by the PLC in unit time.
Summary of steel strip tension and furnace roll related parameters table 1:
steel strip thickness, furnace roller rotation speed difference and acceleration and deceleration parameters table 2:
the above parameter table is obtained by the theoretical analysis and the summary of the production experience. During production, relevant furnace roller parameters are selected according to the thickness of the steel strip, the rotation speed of the furnace roller is controlled by combining with the actual production, until tension loading is completed, the tension loading range cannot exceed the requirement of the maximum tension of the steel strip, and the steel strip is prevented from being broken.
When tension needs to be increased, the corresponding steel belt acceleration is only needed to be input into the PLC, and the PLC automatically regulates and controls according to the measured rotating speeds of the front furnace roller 11 and the rear furnace roller 11, so that a specified rotating speed difference is formed between the front furnace roller 11 and the rear furnace roller 11, and the tension of the steel belt 3 is increased. When the tension is increased to a prescribed value, the difference in speed between the front and rear rolls is removed, so that the steel strip 3 can be maintained in the tension transmission.
However, although some nodules 2 are pressed into the steel strip 3, the nodules 2 are relatively strongly bonded to the furnace rolls 11, and if the nodules 2 are not deeply embedded in the steel strip 3 or the clamping force of the steel strip 3 against the nodules 2 is not large enough, the nodules 2 will not be separated from the furnace rolls 11.
For this purpose, variable speed rotation of the furnace roller 11 is controlled by an inverter motor, and when the furnace roller 11 rotates at variable speed, the furnace roller 11 slips on the steel strip 3, and relative displacement is generated between the furnace roller 11 carrying the nodule 2 and the steel strip 3. When the accretion 2 is pressed into the steel strip 3, the accretion 2 is separated from the furnace roller 11 by a shear force in a tangential direction of the furnace roller 11 due to displacement between the both.
Example two:
(2) the deviation rectifying roller in the control roller group drives the steel strip to move along the furnace roller in an axial reciprocating swing mode to remove the accretion:
some furnace marks are caused by burrs of the steel strip 3, which are flat sheets, and the nodules 2 cannot be pressed into the steel strip 3, so that the furnace marks cannot be eliminated in the mode of the first embodiment. The following method is provided for eliminating such nodules 2.
The continuous annealing furnace is internally provided with a deviation rectifying roller 12 for preventing the steel strip 3 from deviating, and the parameters of a control console of the continuous annealing furnace are regulated and controlled, so that the furnace roller 12 in the region of the furnace roller 11 carrying the nodules 2 controls the steel strip 3 to axially and reciprocally swing along the furnace roller 11, and because the furnace roller 11 is in a rotating state, when the nodules 2 on the furnace roller 11 rotate to be in contact with the steel strip 3, the steel strip 3 can push the nodules 2 to move towards one side of the furnace roller 11; when the accretion 2 on the furnace roller 11 rotates to a region not in contact with the steel strip 3, the steel strip 3 returns to the original position, and when it comes into contact with the accretion 2 next time, the accretion 2 is pushed to move until the accretion 2 is completely pushed out to the furnace roller 11 side and falls from this side. Of course, in the process, the accretion 2 is likely to loose and then fall off from the furnace roller 11 directly, and the purpose of removing the accretion 2 is achieved.
Example three:
(3) and (3) controlling the positive and negative directions of the furnace roller in the roller group to repeatedly adjust the rotating direction to remove the nodules:
in order to further remove the nodules 2, the invention also provides a method for repeatedly discharging (discharging tension) and building (establishing tension) the tension of the steel strip 3, and the specific operation method is the same as the first embodiment.
The rotating direction and the rotating speed of each furnace roller 11 are controlled by a continuous annealing furnace control console, and a motor for driving the furnace rollers 11 to rotate is a variable frequency motor which can control the rotating speed of the furnace rollers 11. When the furnace roller 11 rotates in the opposite direction of the steel strip 3 transmission, the steel strip 3 is discharged, in the process, the steel strip 3 is gradually separated from the furnace roller 11 when the discharge is continuously performed, when the steel strip 3 is about to be separated from the furnace roller 11, the furnace roller 11 keeps rotating continuously and rubs on the steel strip 3, and the nodules 2 fall off due to the friction with the steel strip 3. In the same way, the motor can drive the furnace roller 11 to rotate forwards after tension is released, tension is established, and the furnace roller 11 and the steel belt 3 rub to remove the nodules 2 in the process of establishing the tension. In the process, the rotation direction of the furnace roller is repeatedly adjusted, and the tension is repeatedly established and released until the accretion is removed.
The three methods are to control the furnace roller, change the motion state of the furnace roller to promote the interaction between the steel strip and the furnace roller (such as friction, for example, increase the tension of the steel strip, etc.), and other methods to control the running state of the steel strip through the furnace roller to eliminate the accretion, which belong to the protection scope of the invention.
The present invention and its embodiments have been described above schematically, without limitation, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if the person skilled in the art receives the teaching, without departing from the spirit of the invention, the person skilled in the art shall not inventively design the similar structural modes and embodiments to the technical solution, but shall fall within the scope of the invention.
Claims (10)
1. A method for quickly eliminating the surface nodules of furnace roller includes
S1: finding that roll marks exist on the surface of the steel strip (3);
s2: locking the position of a furnace roller (11) carrying the nodules (2);
s3: controlling the differential rotation of adjacent furnace rollers (11) in the roller set (1) of the area where the accretion (2) is located or the variable-acceleration rotation of a single furnace roller (11) by using a control console;
s4: and (4) observing whether the roll mark on the steel strip (3) disappears, if so, resuming the production, and if not, returning to execute the step S3.
2. The method according to claim 1, wherein in the step S2, the length of the adjacent roll mark on the steel strip (3) carrying the roll mark is measured, the diameter of the furnace roll (11) adhered to the nugget (2) is calculated based on the length, and the position of the furnace roll (11) carrying the nugget (2) is locked against the roll diameter table.
3. The method of claim 1, wherein in the step S3, the differential rotation is that the furnace roller (11) carrying the nodules (2) in the roller group (1) and the furnace roller (11) adjacent to the furnace roller are controlled by a control console so that the rotation speed of the furnace roller at the front is higher than that of the furnace roller at the rear to increase the tension of the steel strip (3), and the nodules (2) are pressed into the steel strip (3) when the furnace roller (11) rotates and are separated from the furnace roller (11) along with the movement of the steel strip (3).
4. A method according to claim 3, characterized in that the variable speed rotation is such that the furnace rollers (11) carrying the nodules (2) are accelerated to increase or decrease their rotational speed in order to produce a relative displacement with the steel strip (3) to assist in the detachment of the nodules (2) pressed into the steel strip (3) from said furnace rollers (11).
5. The method according to claim 1, characterized in that the speed difference between the adjacent furnace rollers (11) in differential rotation is 10-100 r/min.
6. A method according to claim 5, characterized in that the acceleration of the variable acceleration rotation of the single furnace roller (11) is (0.05-0.15 m/s)2) And R is the radius of the furnace roller.
7. The method of claim 1, wherein the step S3 is replaced with a step S6,
s6: the steel strip (3) is driven by a deviation rectifying roller (12) in the roller set (1) to axially and reciprocally swing along a furnace roller (11) on the furnace roller (11), and the periodically swinging steel strip (3) pushes a knot (2) to axially move along the furnace roller (11) until the edge of the furnace roller (11) falls off.
8. The method of claim 1, wherein the step S3 is replaced with a step S6,
s6: and controlling the rotation direction of the furnace roller (11) in the roller group (1) to be repeatedly changed, so that the tension of the steel strip is repeatedly formed or removed in the roller group (1), and the nodules (2) fall off due to repeated friction with the steel strip (3) in the process.
9. The method according to claim 1, characterized in that after the step S1, the steel strip (3) is lowered in transport speed and the annealing furnace temperature is correspondingly lowered.
10. A method according to any one of claims 1 to 9, characterized in that it is used in a continuous annealing furnace for removing accretions (2) on the furnace rolls (11).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111003428.8A CN113798981B (en) | 2021-08-30 | 2021-08-30 | Method for rapidly eliminating furnace roller surface nodulation |
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| CN202111003428.8A CN113798981B (en) | 2021-08-30 | 2021-08-30 | Method for rapidly eliminating furnace roller surface nodulation |
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| CN113798981B CN113798981B (en) | 2023-04-28 |
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| CN115449620A (en) * | 2022-08-04 | 2022-12-09 | 包头钢铁（集团）有限责任公司 | Method for quickly positioning and processing accretions of carbon sleeves of furnace rollers of horizontal annealing furnace |
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| CN113798981B (en) | 2023-04-28 |
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