CN110000222B - Method for improving drift deviation of strip steel - Google Patents
Method for improving drift deviation of strip steel Download PDFInfo
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- CN110000222B CN110000222B CN201910215983.3A CN201910215983A CN110000222B CN 110000222 B CN110000222 B CN 110000222B CN 201910215983 A CN201910215983 A CN 201910215983A CN 110000222 B CN110000222 B CN 110000222B
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- strip steel
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/72—Rear end control; Front end control
Abstract
The invention provides a method for improving the drift deviation of strip steel, which comprises the steps of monitoring the length of the residual strip steel on an uncoiler, and adjusting the pressure of a tension roller compression roller cylinder according to the monitored length of the residual strip steel on the uncoiler; monitoring the speed of the inlet section of the uncoiler, and adjusting the tension of an inlet loop according to the monitored speed of the inlet section of the uncoiler; monitoring the amount of deviation of belted steel, according to monitoring the pressure of the amount of deviation adjustment zinc-plating lap-joint welding machine clamp of belted steel, through monitoring the length of remaining belted steel, the amount of deviation of belted steel can be reduced to the pressure of adaptive adjustment tension roll compression roller cylinder, be unlikely to again make the belted steel skid, the tension of adjustment entry loop can reduce the belted steel and skid or the drift because the tension of entry loop appears skidding, and at the welded in-process, according to the amount of deviation control zinc-plating lap-joint welding machine clamp pressure of belted steel, make the belted steel centering, convenient welding goes on, can also prevent the off tracking of back book belted steel, and the device has good practicality.
Description
Technical Field
The invention relates to the technical field of cold rolling production, in particular to a method for improving tail-flick deviation of strip steel.
Background
The drift deviation of the strip steel at the galvanizing inlet belongs to cold state deviation. At present, in the operation of a galvanization inlet section with a quick production rhythm, a modern hot galvanizing unit requires that strip steel runs under a certain stable state, but the deviation of the strip steel is almost inevitable, and the deviation of the strip steel not only can influence the quality of the strip steel, but also can seriously damage unit equipment and bring influence on the stable running of the unit.
The drift process of the galvanizing unit belongs to the last step of finishing production of a roll of strip steel before entrance production, if the drift deviation process occurs, the strip steel may deviate from the edge of a roller, an operator must rewind to re-weld, the centering of a welding machine is influenced, the trimming accuracy of trimming shears is influenced, the furnace area is decelerated or stopped, and the production of a brought-out product and the operation of a production line are influenced.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a method for improving the drift deviation of strip steel.
In order to achieve the purpose, the invention adopts the following technical scheme:
in one general aspect, a method for improving the drift deviation of strip steel is provided, which comprises the following steps:
monitoring the length of the residual strip steel on the uncoiler;
adjusting the pressure of a compression roller cylinder of the tension roller according to the monitored length of the residual strip steel on the uncoiler;
monitoring the speed of the inlet section of the uncoiler;
adjusting the tension of an inlet loop according to the monitored speed of the inlet section of the uncoiler;
monitoring the deviation of the strip steel;
and adjusting the pressure of the clamp of the galvanized lap welding machine according to the monitored deviation of the strip steel.
Preferably, the pressure of the tension roller and the roller cylinder is 0.4-0.6 MPa.
Preferably, the length of the tension roller pressing roller is greater than that of the tension roller.
Preferably, the step of adjusting the pressure of the compression roller cylinder of the tension roller according to the monitored length of the residual strip steel on the uncoiler specifically comprises the following steps:
the preset length of the residual strip steel on the uncoiler is given,
when the length of the residual strip steel on the uncoiler is greater than the preset length, increasing the pressure of a tension roller and a compression roller cylinder;
and when the length of the residual strip steel on the uncoiler is smaller than the preset length, reducing the pressure of the tension roller and the pressure roller cylinder.
Preferably, the pressure value of the tension roller cylinder is calculated according to the formula Z ═ mX + n, wherein Z is the pressure value of the tension roller cylinder, Z is in MPa, X is the length of the strip steel remaining on the uncoiler, X is in m, and m and n are known constants.
Preferably, the adjusting of the tension of the inlet loop according to the monitored speed of the inlet section of the uncoiler specifically comprises:
when the speed of the inlet section of the uncoiler is monitored to be reduced to 30m/min, controlling the tension of the inlet loop to be a preset tension;
when the speed of the inlet section of the uncoiler is monitored to be reduced to stop, the tension of the inlet loop is controlled to be 80% of the preset tension.
Preferably, the value of the preset tension is calculated according to the formula F-atb, where F is the preset tension value, a is the tension coefficient of the strip at the inlet loop, t is the strip thickness, b is the strip width, F is in N, and a is in N/mm2B is in mm and t is in mm.
Preferably, the step of adjusting the clamp pressure of the galvanized lap welder according to the monitored thickness of the strip steel specifically comprises the following steps: when the deviation of the strip steel is increased, the pressure of the clamp of the galvanized lap welder is increased.
Preferably, the galvanized lap welder is a narrow lap welder or a laser welder.
The invention provides a method for improving the drift deviation of strip steel, wherein after the steel strip is sheared, the longer the length of the tail part of the strip steel is, the higher the probability of drift deviation is, so that the pressure of a tension roller and a compression roller cylinder is adaptively adjusted by monitoring the length of the rest strip steel to adjust the tightness of the strip steel, further reduce the drift of the strip steel and prevent the strip steel from slipping; when the speed of the inlet section of the uncoiler is monitored to reduce and weld preparation is carried out, the strip steel can be pulled to continue to advance by the tension of the inlet loop, the strip steel can be prevented from slipping or drifting because of the tension of the inlet loop by adjusting the tension of the inlet loop, and in the welding process, the inevitable deviation occurs, so that the pressure of the clamp of the galvanized lap welding machine needs to be controlled according to the deviation amount of the strip steel, the strip steel is centered, welding is convenient to carry out, the deviation of the back-coiled strip steel can be prevented, and the uncoiler has good practicability.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a flow chart of the method for improving the drift deviation of the strip steel of the invention;
FIG. 2 is a schematic diagram of the strip stress on the tension roll of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
Fig. 1 is a flowchart of a method for improving the drift deviation of strip steel according to the present invention, and as shown in fig. 1, the method for improving the drift deviation of strip steel of the present embodiment includes the following steps:
and S01, monitoring the length of the residual strip steel on the uncoiler.
In step S01 of this embodiment, since the drift deviation of the strip steel occurs on the tension roller, when the strip steel performs the drift action, the strip steel is in a tension-free state, and since the pressure on the two sides of the strip steel is not uniform, the more the strip steel rolls the more the strip steel, the more the strip steel deviates under the rolling of the compression roller, and the strip steel deviates under the action of the compression roller, the longer the remaining strip steel length is, the larger the deviation amount of the strip steel in the deviation process will be. And the deviation of the strip steel is different due to different steel types and different specifications of the rigid strip. After the current strip steel and the next strip steel are welded and released, if the deviation trend still exists, the deviation of the next strip steel is more and more serious.
And S02, adjusting the pressure of the tension roller and the compression roller cylinder according to the monitored length of the residual strip steel on the uncoiler.
In step S02 of this embodiment, for the steel strip of the same specification, a preset length of the remaining length of the steel strip needs to be set first, when the length of the steel strip of the specification remaining on the uncoiler is detected to be greater than the preset length, the pressure of the tension roller and the pressure roller cylinder is increased to prevent the offset of the rigid strip from expanding rapidly, and when the length of the steel strip of the specification remaining on the uncoiler is detected to be less than the preset length, the pressure of the tension roller and the pressure roller cylinder needs to be decreased. If the pressure is too high, the steel belt slips on the tension roller, so that the steel belt completely slips into the inlet section of the uncoiler, and subsequent welding work cannot be performed.
Further, adjusting the pressure of the tension roller and the compression roller cylinder according to the monitoring of the length of the residual strip steel on the uncoiler specifically comprises: and calculating the pressure value Z of the tension roller cylinder according to the formula Z-mX + n, wherein m and n are correlation constants. Because the distance between the uncoiler and the steel coil of the whole production line is fixed, when certain type of strip steel is uncoiled, the value range of the residual length of the strip steel can be determined according to the results of multiple experiments, X is the length of the residual strip steel on the uncoiler in the uncoiling process of a certain time in the value range, and the value range of the pressure value of the tension roller compression roller cylinder which can prevent the strip steel from deviating and prevent the strip steel from slipping is determined at the same time.
Furthermore, in the uncoiler equipment, the length of the tension roller compression roller is greater than that of the tension roller, and the tension roller compression roller covers the whole tension roller, so that in the process of tail flicking deviation of the steel strip, the tension roller compression roller can be always attached to the steel strip, the pressure is provided for the steel strip, and the excessive tail flicking deviation of the steel strip is prevented.
And S03, monitoring the speed of the inlet section of the uncoiler.
In step S03 of this embodiment, the speed of the inlet section of the uncoiler is positively correlated with the tension of the inlet loop of the inlet section of the uncoiler, and when a previous strip steel and a next strip steel need to be cut and butted, the speed of the inlet section of the uncoiler is reduced, and if the tension of the inlet loop of the inlet section is not changed when the speed is reduced, the strip steel is pulled into the inlet section due to the deformation tension generated by the inlet loop, which is not beneficial to the welding operation.
And S04, adjusting the tension of the inlet loop according to the monitored speed of the inlet section of the uncoiler.
In step S04 of this embodiment, when a previous strip steel and a next strip steel need to be cut and butted, the speed of the inlet section of the uncoiler is reduced to 60m/min in advance, when the grating signal of the strip steel detects the tail of the strip steel, that is, the previous strip steel is uncoiled, and is about to enter the tail flicking process, at this time, the speed of the inlet section of the uncoiler is continuously reduced to 30m/min, then the low strip steel at the inlet section can crawl at 30m/min, at this time, the tension of the inlet loop at the inlet section of the uncoiler needs to be reduced, the tension is set to be a preset tension, then when the speed of the inlet section of the uncoiler is reduced to stop, the tension of the inlet loop at the inlet section needs to be adjusted to 80% of the preset tension, otherwise, the strip steel can be pulled into the inlet section under the.
Fig. 2 is a schematic diagram of the stress of the strip steel on the tension roll of the present invention, and as shown in fig. 2, adjusting the tension of the inlet loop according to the monitored speed of the inlet section of the uncoiler specifically includes calculating the value F of the preset tension according to the formula F-atb, specifically, the tension of the inlet loop is the product of the thickness of the strip steel x the width of the strip steel x the tension coefficient, a is the tension coefficient of the strip steel at the inlet loop, t is the thickness of the strip steel, and b is the width of the strip steel.
And S05, monitoring the deviation of the strip steel.
In step S05 of this embodiment, since the drift deviation of the strip steel cannot be avoided, after the above 4 steps, a part of the deviation is improved, but the strip steel still has a certain deviation which affects the welding between the previous strip steel and the next strip steel, so that the deviation of the strip steel is monitored and preparation is made for final adjustment.
And S06, adjusting the clamp pressure of the galvanized lap welder according to the monitored deviation of the strip steel.
In step S06 of this embodiment, a previous strip steel and a subsequent strip steel need to be welded, and centering work needs to be performed on a welding platform of a welding machine before welding, so a narrow lap welding machine or a laser welding machine with a clamp needs to be adopted, and the pressure of the clamp is adjusted through the obtained deviation of the strip steel, so that the clamp pushes the deviated strip steel to center, and the larger the deviation is, the larger the pressure required by the clamp is. Because the maximum distance of the clamps in each welding machine is fixed, the clamps can be controlled to expand the distance between the clamps to accommodate the strip steel through the detected deviation of the strip steel, then the clamps are controlled to slowly approach to the middle, the strip steel is centered through the driving force of the clamps, and after the strip steel is centered, the clamping force of the clamps is maintained unchanged, so that the strip steel can be maintained in a centered state, the strip steel can be ensured to be normally welded, and the deviation of the welded strip steel does not exist.
Example 2
As another embodiment of the present specification, unlike embodiment 1, in step S02 of this embodiment, a steel strip with a gauge of 1.3mm × 1250mm is used, during the actual test, the remaining length of the steel strip ranges from 21 to 25m, the pressure of the tension roller pressure cylinder ranges from 0.4 to 0.6MPa, the value range is substituted into the formula Z ═ mX + n to calculate that m is 0.05, n is-0.65, i.e., Z ═ 0.05X-0.65, the preset length of the remaining steel strip on the uncoiler is set to the intermediate value of 23m, the preset value of the pressure of the tension roller pressure cylinder can be calculated to be 0.5MPa, during the subsequent uncoiling, when the length of the remaining steel strip on the uncoiler is greater than the preset length, the pressure of the tension roller pressure cylinder is increased, and when the length of the remaining steel strip on the uncoiler is less than the preset length, the pressure of the tension roller air cylinder is reduced, and the pressure value of the corresponding tension roller air cylinder can be calculated by only detecting the value of the residual length of the strip steel and substituting the value into the corresponding formula.
Further, in step S04 of this embodiment, as shown in fig. 2, the direction of F is the direction in which the strip travels, and this embodiment uses a steel strip with a specification of 1.3mm × 1250mm, and it is experimentally determined that the tension coefficient of the steel strip with this specification is 1.4, then the tension of the strip at the outlet of the tension roll is atb — 14 × 1.3 × 1250 — 22750N, and since the tension of the strip at the tail end of the strip is zero, the tension F of the strip at the inlet loop needs to be offset by the friction force generated by the pressure G of the pressure roll to avoid the strip from being brought into the uncoiler by the tension at the inlet loop.
Further, the pressure value of the pressure roller cylinder of the tension roller is adjusted and the length of the pressure roller of the tension roller is made to be larger than that of the tension roller in the step S02, so that the contact area is increased, the tension at the inlet loop can be well compensated by increasing friction, and when necessary, the tension F of the inlet loop is adjusted to 80% of the preset tension, namely the tension F of the inlet loop is adjusted to 22750N × 80% — 18200N to adapt to the friction force generated by the pressure roller, and the deviation of the strip steel is prevented.
In summary, the embodiment of the invention provides a method for improving the drift deviation of strip steel, because after the steel strip is sheared, the longer the length of the tail part of the strip steel is, the greater the probability of drift deviation is, the tightness of the strip steel is adjusted by monitoring the length of the rest strip steel and adaptively adjusting the pressure of a tension roller and a pressure roller cylinder, so that the drift deviation of the strip steel is reduced, and the strip steel is prevented from slipping; when the speed of the inlet section of the uncoiler is monitored to reduce and weld preparation is carried out, the strip steel can be pulled to continue to advance by the tension of the inlet loop, the strip steel can be prevented from slipping or drifting because of the tension of the inlet loop by adjusting the tension of the inlet loop, and in the welding process, the inevitable deviation occurs, so that the pressure of the clamp of the galvanized lap welding machine needs to be controlled according to the deviation amount of the strip steel, the strip steel is centered, welding is convenient to carry out, the deviation of the back-coiled strip steel can be prevented, and the uncoiler has good practicability.
The foregoing description has been directed to specific embodiments of this disclosure. Other embodiments are within the scope of the following claims. In some cases, the actions or steps recited in the claims may be performed in a different order than in the embodiments and still achieve desirable results. In addition, the processes depicted in the accompanying figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results. In some embodiments, multitasking and parallel processing may also be possible or may be advantageous.
It should be noted that, for those skilled in the art, without departing from the principle of the present application, several improvements and modifications can be made, and these improvements and modifications should also be construed as the protection scope of the present application.
Claims (9)
1. A method for improving the drift deviation of strip steel is characterized by comprising the following steps:
monitoring the length of the residual strip steel on the uncoiler;
adjusting the pressure of a compression roller cylinder of a tension roller according to the monitored length of the residual strip steel on the uncoiler;
monitoring the speed of the inlet section of the uncoiler;
adjusting the tension of an inlet loop according to the monitored speed of the inlet section of the uncoiler;
monitoring the deviation of the strip steel;
and adjusting the pressure of the clamp of the galvanized lap welding machine according to the monitored deviation of the strip steel.
2. The method for improving the drift deviation of the strip steel as claimed in claim 1, wherein the pressure of the tension roller and the compression roller cylinder is 0.4-0.6 MPa.
3. The method for improving the drift deviation of the strip steel as claimed in claim 2, wherein the length of the tension roller is greater than that of the tension roller.
4. The method for improving the drift deviation of the strip steel according to claim 1, wherein the step of adjusting the pressure of the compression roller cylinder of the tension roller according to the monitored length of the residual strip steel on the uncoiler specifically comprises the following steps:
given the preset length of the remaining strip on the uncoiler,
when the length of the residual strip steel on the uncoiler is greater than the preset length, increasing the pressure of the tension roller and the compression roller cylinder;
and when the length of the residual strip steel on the uncoiler is smaller than the preset length, reducing the pressure of the tension roller and the compression roller cylinder.
5. The method for improving the tail deviation of the strip steel as claimed in claim 4, wherein the pressure value of the tension roller cylinder is calculated according to the formula Z-mX + n, wherein Z is the pressure value of the tension roller cylinder, Z is in MPa, X is the length of the strip steel remained on the uncoiler, X is in m, and m and n are known constants.
6. The method for improving the tail-flick deviation of the strip steel as claimed in claim 1, wherein the step of adjusting the tension of the inlet loop according to the monitored speed of the inlet section of the uncoiler specifically comprises the following steps:
when the speed of the inlet section of the uncoiler is monitored to be reduced to 30m/min, controlling the tension of the inlet loop to be a preset tension;
when the speed of the inlet section of the uncoiler is monitored to be reduced to stop, the tension of the inlet loop is controlled to be 80% of the preset tension.
7. The method for improving the drift deviation of the strip steel as claimed in claim 6, wherein the preset tension value is calculated according to the formula F-atb, wherein F is the preset tension value, a is the tension coefficient of the strip steel at the inlet loop, t is the thickness of the strip steel, b is the width of the strip steel, F is in N, and a is in N/mm2B is in mm and t is in mm.
8. The method for improving the drift deviation of the strip steel according to claim 1, wherein the step of adjusting the pressure of the clamp of the galvanized lap welder according to the monitored thickness of the strip steel specifically comprises the following steps: and when the deviation of the strip steel is increased, the pressure of the clamp of the galvanized lap welding machine is increased.
9. The method for improving the drift deviation of the steel strip as claimed in claim 1, wherein the galvanized lap welder is a narrow lap welder or a laser welder.
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| CN111500848B (en) * | 2020-06-08 | 2021-10-22 | 中冶赛迪技术研究中心有限公司 | Parking tension eliminating method for large-scale strip steel continuous annealing furnace |
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| CN106345846A (en) * | 2016-09-26 | 2017-01-25 | 常熟市威成机械有限公司 | Sheet unreeling device capable of preventing loosening |
| CN108946282A (en) * | 2018-09-03 | 2018-12-07 | 重庆东登科技有限公司 | Precision detection system and method for deviation correcting device |
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| CN101934293B (en) * | 2010-08-30 | 2012-09-05 | 河北钢铁股份有限公司唐山分公司 | Method for solving problem of loop charging and drifting of production line of pickling-rolling coupled machine |
| CN102553948B (en) * | 2011-12-30 | 2014-07-23 | 中冶南方（武汉）自动化有限公司 | Automatic dynamic adjustment method for synchronous extension of loop of cold rolling continuous processing line |
| CN104174658B (en) * | 2014-08-04 | 2016-03-09 | 山西太钢不锈钢股份有限公司 | A kind of preventing is with steel material tail to run the method for material |
| CN106807760A (en) * | 2015-11-27 | 2017-06-09 | 宝山钢铁股份有限公司 | Tension force optimization method during cold-strip steel welding whipping |
| CN106429575B (en) * | 2016-11-22 | 2017-12-29 | 首钢京唐钢铁联合有限责任公司 | A kind of continuous hot galvanizing entry loop tension force and control system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106345846A (en) * | 2016-09-26 | 2017-01-25 | 常熟市威成机械有限公司 | Sheet unreeling device capable of preventing loosening |
| CN108946282A (en) * | 2018-09-03 | 2018-12-07 | 重庆东登科技有限公司 | Precision detection system and method for deviation correcting device |
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