A control method in the cold rolling process of strip steel

Abstract

This application relates to the field of metallurgical processing technology, and discloses a control method in the cold rolling process of strip steel. The method includes: in the strip steel uncoiling stage, sequentially passing the strip steel in the steel coil through an uncoiler, a wrinkle prevention roller, and an entry pinch roll to send it to a straightener; obtaining first deviation data, where the first deviation data at least includes the number of loose coils on the outer ring of the steel coil, the tension of the strip steel on the uncoiler, the amplitude of the unilateral deviation of the strip steel on the outer ring of the steel coil from the end of the steel coil, the looping height of the strip steel between the entry pinch roll and the straightener, and the deviation amplitude between the center line of the strip steel and the rolling center line; if any one of the first deviation data meets the first deviation determination condition, then perform a first anti-deviation action in the strip steel uncoiling stage. The technical solution of the embodiment of this application can effectively prevent the strip steel from deviating and improve the stability of the production line operation.

Description

Technical Field

[0001] The present application relates to the field of metallurgical processing technology, and in particular, to a control method in a strip steel cold rolling process. Background Art

[0002] At present, in the production of the acid continuous rolling unit, when the strip is uncoiled and threaded in the entrance area, the strip is often deviated at the entrance pinch rollers and straightening machine, and there is also a risk of deviation during the unloading process. Most of the existing solutions to such problems are defective. Often, the deviation of the strip cannot be discovered in time, resulting in accidents such as scratches on the edge of the strip. After the accident, it not only takes a long time to deal with it, but also causes a large amount of waste. Based on this, how to prevent the strip from deviating during the cold rolling process is a technical problem that needs to be solved urgently. Summary of the invention

[0003] The purpose of this application is to provide a control method in the cold rolling process of strip steel, thereby preventing the strip steel from running off track and improving the stability of the production line operation.

[0004] Other features and advantages of the present application will become apparent from the following detailed description, or may be learned in part by the practice of the present application.

[0005] According to one aspect of an embodiment of the present application, a control method for a cold rolling process of a steel strip is provided, wherein the cold rolling process of the steel strip includes a strip uncoiling stage, and the method includes: in the strip uncoiling stage, sequentially passing the strip in the steel coil through an uncoiling machine, an anti-wrinkle roller, and an entrance pinch roller to pass through a straightening machine; obtaining first deviation data, wherein the first deviation data includes at least the number of unwinding turns of the outer ring of the steel coil, the tension of the strip on the uncoiling machine, the amplitude of the single-sided deviation of the strip of the outer ring of the steel coil from the end of the steel coil, the sleeve-up height of the strip between the entrance pinch roller and the straightening machine, and the deviation amplitude between the center line of the strip and the rolling center line; if any one of the first deviation data satisfies the first deviation judgment condition, performing a first anti-deviation action in the strip uncoiling stage.

[0006] In one embodiment of the present application, the first deviation judgment condition includes at least: the number of uncoiled turns of the outer ring of the steel coil is greater than or equal to 2 turns; the tension of the strip on the uncoiler is less than or equal to 17KN; the amplitude of the single-sided deviation of the strip of the outer ring of the steel coil from the end of the steel coil is greater than or equal to 20mm; the strip lifting height between the entrance pinch roller and the straightening machine is greater than or equal to 180mm; the deviation amplitude between the center line of the strip and the rolling center line is greater than or equal to 30mm.

[0007] In an embodiment of the present application, performing a first anti-deviation action during the strip uncoiling stage includes: controlling the automatic step of uncoiling to stop; controlling the uncoiler to reverse at a speed of 30 m / min for 400 - 650 mm to eliminate the loose coiling of the outer ring of the steel coil; establishing the uncoiler tension and controlling the uncoiler tension to be maintained at 25 KN; lifting the entry pinch roll, and using the straightener to jog the strip forward at a speed of 30 m / min to a threading distance of 350 - 550 mm so as to eliminate the looping part of the strip between the entry pinch roll and the straightener; after the looping part of the strip between the entry pinch roll and the straightener is eliminated, controlling to jog the strip forward to a threading distance of 800 - 1000 mm; after controlling to jog the strip forward to a threading distance of 800 - 1000 mm, if the deviation amplitude between the strip center line and the rolling center line is less than or equal to 30 mm, then continue to pass the strip in the steel coil through the uncoiler, the anti-wrinkle roll, and the entry pinch roll to the straightener in sequence to continue the automatic uncoiling step; if the deviation amplitude between the strip center line and the rolling center line is greater than or equal to 35 mm, then under the condition that the distance between the strip edge and the straightener is greater than or equal to 35 mm, control the strip to jog forward to the centering device at a speed of 15 m / min, and use the centering device to align the strip.

[0008] In an embodiment of the present application, the strip cold rolling process further includes a strip threading stage, and the strip threading stage is performed after the strip uncoiling stage. The method further includes: during the strip threading stage, passing the strip through the centering device, the shear entry pinch roll, the slitting shear, the shear exit pinch roll, and the turning pinch roll in sequence to the welder. Among them, at least one grating is provided on the threading path between the straightener and the welder; obtaining second deviation data, and the second deviation data at least includes the looping height of the strip between the straightener and the shear entry pinch roll, the deviation amplitude between the strip center line and the rolling center line after the strip passes through the turning pinch roll by 1500 - 2000 mm, the straightener torque when the strip is sent to the welder, the grating signal, and the tension of the strip on the uncoiler; if any one of the second deviation data satisfies the second anti-deviation determination condition, then perform a second anti-deviation action during the strip threading stage.

[0009] In an embodiment of the present application, the second anti-deviation determination condition at least includes: the looping height of the strip between the straightener and the shear entry pinch roll is greater than or equal to 230 mm; the deviation amplitude between the strip center line and the rolling center line after the strip passes through the turning pinch roll by 1500 - 2000 mm is greater than or equal to 30 mm; the straightener torque when the strip is sent to the welder is greater than or equal to 90 N·m; the grating signal appears stroboscopic; the tension of the strip on the uncoiler is lower than 5% of the set value of the strip tension on the uncoiler.

[0010] In one embodiment of the present application, performing the second anti-deviation action during the strip threading stage includes: controlling the automatic stop of the uncoiler step; aligning and clamping the strip through the centering device, and using group jogging to return the defective part of the strip to the slitting shear, and using the slitting shear to cut off the defective part.

[0011] In one embodiment of the present application, the strip cold rolling process further includes a strip feeding stage, which is performed after the strip threading stage. During the strip feeding stage, the method further includes: tightening the welded strip and passing it through the first deviation correction roller on the loop equipment, and obtaining the deviation correction roller value of the first deviation correction roller; if the deviation correction roller value of the first deviation correction roller exceeds ±50 mm, open the first deviation correction roller press roller provided on the first deviation correction roller, and jog the strip forward at a speed of 30 m / min for 1-2 min; if the deviation correction roller value of the first deviation correction roller does not exceed ±50 mm, jog the strip forward at a speed of 60 m / min; after the strip jogs forward a distance of 50-70 m, if the deviation correction roller value of the first deviation correction roller does not exceed ±50 mm, jog the strip forward at a speed of 660 m / min.

[0012] In one embodiment of the present application, after the strip passes through the first deviation correction roller, the strip further passes through the second deviation correction roller and the third deviation correction roller on the loop equipment in sequence. The method further includes: when the strip passes through the second deviation correction roller or the third deviation correction roller, obtaining the deviation correction roller value of the second deviation correction roller or the deviation correction roller value of the third deviation correction roller; if the deviation correction roller value of the second deviation correction roller or the deviation correction roller value of the third deviation correction roller exceeds ±50 mm, reduce the forward jogging speed of the strip from 660 m / min to 230 m / min; if the deviation correction roller values of both the second deviation correction roller and the third deviation correction roller do not exceed ±50 mm, restore the forward jogging speed of the strip to 660 m / min.

[0013] In one embodiment of the present application, the method further includes: if the deviation correction roller value of the second deviation correction roller exceeds ±140 mm, perform an emergency stop; control the speed of the strip passing through the pickling outlet on the loop equipment to be reduced from 230 m / min to 120 m / min; increase the inlet loop tension of the strip on the loop equipment by 15% of the set value of the inlet loop tension; if the deviation correction roller value of the second deviation correction roller does not exceed ±50 mm, restore the forward jogging speed of the strip to 660 m / min.

[0014] In an embodiment of the present application, the control modes for the second deviation rectifying roller include a remote control mode and a local control mode, and the method further includes: in the remote control mode of the second deviation rectifying roller, if the deviation rectifying roller value of the second deviation rectifying roller exceeds ±180 mm, controlling the inlet loop and the outlet loop of the strip steel on the loop equipment to stop simultaneously, and switching the control mode of the second deviation rectifying roller from the remote control mode to the local control mode; controlling the strip steel to pass through the pickling outlet on the loop equipment at a speed of 30 m / min and a passing-through time of 1 - 2 min; if the deviation rectifying roller value of the second deviation rectifying roller does not exceed ±50 mm, restoring the control mode of the second deviation rectifying roller from the local control mode to the remote control mode, and controlling the speed of the strip steel passing through the pickling outlet on the loop equipment to be 230 m / min; when the loop amount on the inlet loop is less than 30% of the overall loop amount on the loop equipment, controlling the speed of the strip steel passing through the inlet of the loop equipment to be 230 m / min; after the strip steel where the strip steel weld is located completely enters and exits the loop, controlling the speed of the strip steel passing through the inlet of the loop equipment to be 660 m / min.

[0015] In the technical solution of the embodiment of the present application, during the strip steel uncoiling stage, the strip steel in the steel coil is sequentially passed through an uncoiler, an anti-wrinkle roller, and an inlet pinch roll to be sent to a straightening machine, and first deviation data is obtained. The first deviation data at least includes the number of loose coils on the outer ring of the steel coil, the tension of the strip steel on the uncoiler, the deviation amplitude of the strip steel on the outer ring of the steel coil from the end of the steel coil on one side, the looping height of the strip steel between the inlet pinch roll and the straightening machine, and the deviation amplitude between the center line of the strip steel and the rolling center line. Then, if any one of the first deviation data satisfies the first deviation determination condition, a first anti-deviation action is performed during the strip steel uncoiling stage. In this way, under the intervention of the first anti-deviation action, the passing direction of the strip steel can be adjusted in a timely and effective manner to prevent the strip steel from deviating, so as to improve the stability of the production line operation.

[0016] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present application. Brief Description of the Drawings

[0017] The accompanying drawings here are incorporated into the specification and constitute a part of this specification, showing embodiments consistent with the present application, and are used together with the specification to explain the principles of the present application. Obviously, the accompanying drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts. In the drawings:

[0018] Figure 1 It is a schematic diagram of the inlet equipment layout shown according to the embodiment of the present application;

[0019] Figure 2 Schematic diagram of the loop equipment layout shown according to an embodiment of the present application;

[0020] Figure 3 Flowchart of a control method in a strip cold rolling process shown according to an embodiment of the present application;

[0021] Figure 4 Detailed flowchart of the strip threading stage shown according to an embodiment of the present application. Specific implementation manners

[0022] Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in various forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this application will be more complete and comprehensive, and will fully convey the concept of the example embodiments to those skilled in the art.

[0023] In addition, the described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of the embodiments of the present application. However, those skilled in the art will realize that the technical solutions of the present application can be practiced without one or more of the specific details, or other methods, components, devices, steps, etc. can be adopted. In other cases, well-known methods, devices, implementations, or operations are not shown or described in detail to avoid obscuring aspects of the present application.

[0024] The block diagrams shown in the drawings are only functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities can be implemented in software form, or in one or more hardware modules or integrated circuits, or in different networks and / or processor devices and / or microcontroller devices.

[0025] The flowcharts shown in the drawings are only illustrative and not necessarily include all the contents and operations / steps, nor are they necessarily executed in the described order. For example, some operations / steps can be decomposed, while some operations / steps can be combined or partially combined, so the actual execution order may change according to the actual situation.

[0026] It should be noted that: "a plurality" as mentioned herein refers to two or more. "And / or" describes the association relationship of associated objects and indicates that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. The character " / " generally represents an "or" relationship between the associated objects before and after.

[0027] It should be noted that the terms "first", "second", etc. in the description, claims and the above-mentioned drawings of this application are used to distinguish similar objects, and do not necessarily describe a specific order or sequence. It should be understood that the objects used in this way can be interchanged under appropriate circumstances, so that the embodiments of this application described here can be implemented in an order other than those illustrated or described.

[0028] The implementation details of the technical solutions of the embodiments of this application are elaborated in detail below:

[0029] Please refer to Figure 1 , Figure 1 FIG. is a schematic diagram of the arrangement of the entrance equipment shown according to an embodiment of this application. In the entrance equipment arranged in the strip uncoiling production line, the steel coil 1 is installed on the uncoiler 2, and the strip is pulled out from the steel coil 1 and passes through the wrinkle prevention roller 3, the entrance pinch roll 4, the straightening machine 5, the grating 6, the centering device 7, the shear entrance pinch roll 8, the slitting shear 9, the shear exit pinch roll 10, the turning pinch roll 11 and the welder 12 in sequence. In addition, a spare strip uncoiling production line 100 is also provided. Among them, the strip in the spare strip uncoiling production line 100 can also pass through each entrance equipment in the spare strip uncoiling production line 100 first, and then be sent to the turning pinch roll 11 after passing through the spare turning pinch roll 101, so as to achieve that any steel coil can be immediately connected after being completely sent into the entrance equipment, without interrupting the operation of the entrance equipment. Among them, the grating 6 can be arranged at multiple places on the operation path of the entrance equipment according to requirements, so as to achieve precise monitoring of the deviation of the strip during the passing process in the entrance equipment.

[0030] Combined with Figure 1 , after the strip passes out from the welder 12, it will enter the loop equipment. Please refer to Figure 2 , Figure 2 FIG. is a schematic diagram of the arrangement of the loop equipment shown according to an embodiment of this application. The strip passes through the first deviation rectifying roller press roll 21, the first deviation rectifying roller 22, the turning roller 23, the tension roller press roll 24, the tension roller 25, the loop car supporting roller 26, the loop car turning roller 27, the second deviation rectifying roller 28 and the third deviation rectifying roller 29 in sequence in the loop equipment. So far, the passing process of the strip in the entrance equipment and the loop equipment is completed.

[0031] Specifically, please refer to Figure 3 , Figure 3 FIG. is a flowchart of a control method in a strip cold rolling process shown according to an embodiment of this application. The strip cold rolling process includes a strip uncoiling stage. Combined with Figure 1 , the strip uncoiling stage is carried out in the entrance equipment and includes the following steps:

[0032] Step 110, in the strip uncoiling stage, the strip in the steel coil is sequentially passed through an uncoiler, an anti-wrinkle roller, and an entry pinch roll and sent to a straightener.

[0033] Step 120, obtain first deviation data, where the first deviation data at least includes the number of loose coils on the outer ring of the steel coil, the tension of the strip on the uncoiler, the deviation amplitude of the strip on the outer ring of the steel coil from the end of the steel coil on one side, the looping height of the strip between the entry pinch roll and the straightener, and the deviation amplitude between the center line of the strip and the rolling center line.

[0034] Step 130, if any one of the first deviation data satisfies the first deviation determination condition, then perform a first anti-deviation action in the strip uncoiling stage.

[0035] In an embodiment of the present application, in combination with Figure 3 Step 120 in, the first deviation determination conditions indicating signs of deviation in the strip uncoiling stage may at least include the following several types:

[0036] First, the number of loose coils on the outer ring of the steel coil is greater than or equal to 2 coils.

[0037] Second, the tension of the strip on the uncoiler is less than or equal to 17 KN.

[0038] Third, the deviation amplitude of the strip on the outer ring of the steel coil from the end of the steel coil on one side is greater than or equal to 20 mm.

[0039] Fourth, the looping height of the strip between the entry pinch roll and the straightener is greater than or equal to 180 mm.

[0040] Fifth, the deviation amplitude between the center line of the strip and the rolling center line is greater than or equal to 30 mm.

[0041] Further, based on Step 130, if any one of the first deviation data satisfies the first deviation determination condition, then perform a first anti-deviation action in the strip uncoiling stage. The first anti-deviation action includes:

[0042] Control the automatic step stop of uncoiling; control the uncoiler to reverse at a speed of 30 m / min for 400 - 650 mm to eliminate the loose coiling of the outer ring of the steel coil; establish the uncoiler tension and control the uncoiler tension to be maintained at 25 KN; lift the entrance pinch roll and use the straightener to jog the strip forward at a speed of 30 m / min to a threading distance of 350 - 550 mm to eliminate the looping part of the strip between the entrance pinch roll and the straightener; after the looping part of the strip between the entrance pinch roll and the straightener is eliminated, control to jog the strip forward to a threading distance of 800 - 1000 mm; after controlling to jog the strip forward to a threading distance of 800 - 1000 mm, if the deviation amplitude between the strip center line and the rolling center line is less than or equal to 30 mm, continue to pass the strip in the steel coil through the uncoiler, anti-wrinkle roll, and entrance pinch roll to the straightener in sequence to continue the automatic uncoiling step; if the deviation amplitude between the strip center line and the rolling center line is greater than or equal to 35 mm, under the condition that the distance between the strip edge and the straightener is greater than or equal to 35 mm, control the strip to jog forward to the centering device at a speed of 15 m / min and use the centering device to align the strip.

[0043] Based on this, under the intervention of the first anti-deviation action, not only can the edge of the strip be prevented from being scratched by the straightener, but also the deviation of the strip can be avoided during the uncoiling stage of the strip, improving the control efficiency of the strip during the threading process.

[0044] In this embodiment, the strip cold rolling process further includes a strip threading stage. Continuing to combine Figure 1 , in the entrance equipment, the strip threading stage is executed after the strip uncoiling stage and can execute the deviation control method according to the steps as Figure 4 shown.

[0045] See Figure 4 , which is a detailed flow chart of the strip threading stage shown according to the embodiment of the present application, specifically including steps 140 to 160:

[0046] Step 140, in the strip threading stage, pass the strip through the centering device, shear entrance pinch roll, slitting shear, shear exit pinch roll, and turning pinch roll in sequence to the welder. Among them, at least one grating is provided on the threading path between the straightener and the welder.

[0047] Step 150, obtain the second deviation data, and the second deviation data at least includes the looping height of the strip between the straightener and the shear entrance pinch roll, the deviation amplitude between the strip center line and the rolling center line after the strip passes through the turning pinch roll by 1500 - 2000 mm, the straightener torque when the strip is sent to the welder, the grating signal, and the tension of the strip on the uncoiler.

[0048] Step 160: If any one of the second deviation data satisfies the second deviation determination condition, then execute the second anti-deviation action during the strip threading stage.

[0049] In an embodiment of the present application, in combination with Figure 4 Step 150 in, the second deviation determination conditions with deviation signs during the strip threading stage may at least include the following several types:

[0050] First, the looping height of the strip between the straightener and the pinch roll at the entrance of the shear is greater than or equal to 230 mm.

[0051] Second, the deviation amplitude between the strip center line and the rolling center line after the strip passes through the turning pinch roll by 1500 - 2000 mm is greater than or equal to 30 mm.

[0052] Third, the torque of the straightener when the strip is threaded to the welder is greater than or equal to 90 N·m.

[0053] Fourth, the grating signal appears stroboscopic.

[0054] Fifth, the tension of the strip on the uncoiler is lower than 5% of the uncoiler strip tension set value.

[0055] Furthermore, in this embodiment, the size of the uncoiler strip tension set value can be set according to different steel grades and specifications. For example, when the production raw material specifications are a thickness of 2.5 mm, a width of 1760 mm, and a yield strength of 550 mpa, the uncoiler strip tension set value can be set to 25 KN.

[0056] Furthermore, based on Step 160, if any one of the second deviation data satisfies the second deviation determination condition, then execute the second anti-deviation action during the strip threading stage. The second anti-deviation action includes:

[0057] Control the uncoiler automatic step to stop; align and clamp the strip through the centering device, and use the group jog to return the defective part of the strip to the slitting shear, and use the slitting shear to cut off the defective part.

[0058] Specifically, it can be confirmed through on-site observation that the strip has defects such as severe raw material waves or sickle bends. Through the intervention of the second anti-deviation action, the defective strip is cut off in time, ensuring the production quality during the strip threading stage and at the same time preventing the strip from deviating.

[0059] In combination with Figure 1 and Figure 2 , after the strip passes through the welder, it will enter the loop equipment.

[0060] In this application, the cold rolling process of the strip steel further includes a strip steel feeding stage, which is carried out after the strip steel threading stage. In the strip steel feeding stage, the specific operations include:

[0061] Tighten the welded strip steel and pass it through the first deviation rectifying roller on the loop equipment, and obtain the deviation rectifying roller value of the first deviation rectifying roller.

[0062] If the deviation rectifying roller value of the first deviation rectifying roller exceeds ±50 mm, open the first deviation rectifying roller pressure roller arranged on the first deviation rectifying roller, and jog the strip steel forward at a speed of 30 m / min for 1 - 2 min in groups.

[0063] If the deviation rectifying roller value of the first deviation rectifying roller does not exceed ±50 mm, jog the strip steel forward at a speed of 60 m / min.

[0064] After the strip steel jogs forward a distance of 50 - 70 m, if the deviation rectifying roller value of the first deviation rectifying roller does not exceed ±50 mm, jog the strip steel forward at a speed of 660 m / min.

[0065] Based on this, taking the production raw material specifications of thickness 2.5 mm, width 1760 mm, and yield strength 550 mpa as an example, when the strip steel passes through the first deviation rectifying roller after welding, the deviation rectifying roller value of the first deviation rectifying roller is 79 mm, it can be determined that the strip steel has a camber defect. The loop equipment emits an alarm signal and causes the feeding to be impossible; at this time, the first deviation rectifying roller pressure roller can be manually opened, and the strip steel can be jogged forward at a speed of 30 m / min in groups. When the deviation rectifying roller value of the first deviation rectifying roller drops to within the range of ±50 mm, it can be controlled to jog the strip steel forward at a speed of 60 m / min. When the strip steel runs out 55 m, observing that the deviation rectifying roller value of the first deviation rectifying roller has dropped to 26 mm, the speed of jogging the strip steel forward can be increased to 660 m / min.

[0066] Further, after the strip steel passes through the first deviation rectifying roller, the strip steel also passes through the second deviation rectifying roller and the third deviation rectifying roller on the loop equipment in sequence. The specific operations further include:

[0067] When the strip steel passes through the second deviation rectifying roller or the third deviation rectifying roller, obtain the deviation rectifying roller value of the second deviation rectifying roller or the deviation rectifying roller value of the third deviation rectifying roller.

[0068] If the deviation rectifying roller value of the second deviation rectifying roller or the deviation rectifying roller value of the third deviation rectifying roller exceeds ±50 mm, reduce the speed of jogging the strip steel forward from 660 m / min to 230 m / min.

[0069] If the deviation roller values of both the second deviation roller and the third deviation roller do not exceed ±50 mm, restore the forward jogging speed of the strip to 660 m / min.

[0070] For example, when the production raw material specifications are a thickness of 2.5 mm, a width of 1760 mm, and a yield strength of 550 mpa, if the deviation roller value of the third deviation roller suddenly changes from 42 mm to 91 mm, the forward jogging speed of the strip can be immediately reduced from 660 m / min to 230 m / min. When the deviation roller value of the third deviation roller drops to 36 mm, the forward jogging speed of the strip is increased to 660 m / min.

[0071] Furthermore, when the strip passes through the second deviation roller, the specific operations further include:

[0072] If the deviation roller value of the second deviation roller exceeds ±140 mm, an emergency stop is performed.

[0073] Control the speed of the strip passing through the pickling outlet on the loop equipment to be reduced from 230 m / min to 120 m / min.

[0074] Increase the inlet loop tension of the strip on the loop equipment by 15% of the inlet loop tension set value.

[0075] If the deviation roller value of the second deviation roller does not exceed ±50 mm, restore the forward jogging speed of the strip to 660 m / min.

[0076] Specifically, when the production raw material specifications are a thickness of 2.5 mm, a width of 1760 mm, and a yield strength of 550 mpa, when the deviation roller value of the second deviation roller exceeds ±140 mm, for example, if the deviation roller value of the second deviation roller is too large and reaches 150 mm, a yellow alarm appears for warning. At this time, an emergency stop can be immediately performed manually, and the speed of the strip passing through the pickling outlet on the loop equipment is reduced from 230 m / min to 120 m / min, and then the inlet loop tension of the strip on the loop equipment is increased by 9 KN. After the deviation roller value of the second deviation roller returns to within the range of ±50 mm, the forward jogging speed of the strip is increased to 660 m / min.

[0077] In this embodiment, the size of the inlet loop tension set value can be set according to different steel grade specifications. For example, when the production raw material specifications are a thickness of 2.5 mm, a width of 1760 mm, and a yield strength of 550 mpa, the inlet loop tension set value can be set to 60 KN before the loop equipment starts.

[0078] Furthermore, the control mode for the second deviation rectifying roller includes a remote control mode and a local control mode. The specific operations further include:

[0079] In the remote control mode of the second deviation rectifying roller, if the deviation rectifying roller value of the second deviation rectifying roller exceeds ±180 mm, control the inlet loop and the outlet loop of the strip steel on the loop equipment to stop simultaneously, and switch the control mode of the second deviation rectifying roller from the remote control mode to the local control mode.

[0080] Control the strip steel to pass through the pickling outlet on the loop equipment at a speed of 30 m / min and a passing-through time of 1 - 2 min.

[0081] If the deviation rectifying roller value of the second deviation rectifying roller does not exceed ±50 mm, restore the control mode of the second deviation rectifying roller from the local control mode to the remote control mode, and control the speed of the strip steel passing through the pickling outlet on the loop equipment to be 230 m / min.

[0082] When the loop amount on the inlet loop is less than 30% of the overall loop amount on the loop equipment, control the speed of the strip steel passing through the inlet of the loop equipment to be 230 m / min.

[0083] After the strip steel where the strip steel weld is located completely enters and exits the loop, control the speed of the strip steel passing through the inlet of the loop equipment to be 660 m / min.

[0084] In the case of production raw material specifications of thickness 2.5 mm, width 1760 mm, and yield strength 550 mpa, during the process of the strip steel passing through the loop equipment, the deviation rectifying roller value of the second deviation rectifying roller can instantaneously increase to 185 mm, causing the inlet loop and the outlet loop to stop automatically simultaneously. The second deviation rectifying roller can be switched to the local mode, and then the strip steel is fed through at a speed of 30 m / min in a group jogging manner for 2 min at the pickling outlet. When the deviation rectifying roller value of the second deviation rectifying roller drops to 45 mm, the second deviation rectifying roller is restored to the remote mode, pickling can start normally, and the speed of the strip steel passing through the pickling outlet on the loop equipment is increased to 230 m / min. Also, when the loop amount on the inlet loop is less than 30% of the overall loop amount on the loop equipment, control the speed of the strip steel passing through the inlet of the loop equipment to be 230 m / min. To prevent the strip steel from running off again, after the strip steel weld completely enters and exits the loop, the speed of the strip steel passing through the inlet of the loop equipment can be increased to 660 m / min.

[0085] In summary, in the technical solution of the embodiment of the present application, during the strip uncoiling stage, the strip in the steel coil is sequentially passed through the uncoiler, the anti-wrinkle roller, and the entry pinch roll and sent to the straightener, and the first deviation data is obtained. The first deviation data at least includes the number of loose coils on the outer ring of the steel coil, the tension of the strip on the uncoiler, the amplitude of the unilateral deviation of the strip on the outer ring of the steel coil from the end of the steel coil, the looping height of the strip between the entry pinch roll and the straightener, and the deviation amplitude between the center line of the strip and the rolling center line. Then, if any one of the first deviation data meets the first deviation determination condition, a first anti-deviation action is performed during the strip uncoiling stage. In this way, under the intervention of the first anti-deviation action, the running direction of the strip can be adjusted in a timely and effective manner to prevent the strip from deviating, so as to improve the stability of the production line operation.

[0086] In addition, the above-mentioned drawings are only schematic illustrations of the processes included in the method according to the exemplary embodiments of the present application, rather than for limiting purposes. It is easy to understand that the processes shown in the above-mentioned drawings do not indicate or limit the time sequence of these processes. Additionally, it is also easy to understand that these processes can be executed, for example, synchronously or asynchronously in multiple modules.

[0087] It should be understood that the present application is not limited to the exact structures that have been described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the present application is only limited by the appended claims.

Claims

1. A control method in the cold rolling process of strip steel, characterized in that, the cold rolling process of strip steel includes a strip steel uncoiling stage, and the method includes: In the strip steel uncoiling stage, the strip steel in the steel coil is sequentially passed through an uncoiler, a wrinkle prevention roller, and an entry pinch roll and sent to a straightener; Obtain first deviation data, where the first deviation data at least includes the number of loose coils on the outer ring of the steel coil, the tension of the strip steel on the uncoiler, the amplitude of the unilateral deviation of the strip steel on the outer ring of the steel coil from the end of the steel coil, the looping height of the strip steel between the entry pinch roll and the straightener, and the deviation amplitude between the center line of the strip steel and the rolling center line; If any one of the first deviation data satisfies the first deviation determination condition, then a first anti-deviation action is performed in the strip steel uncoiling stage; The cold rolling process of strip steel further includes a strip steel threading stage, and the strip steel threading stage is performed after the strip steel uncoiling stage. The method further includes: In the strip steel threading stage, the strip steel is sequentially passed through a centering device, a shear entry pinch roll, a slitting shear, a shear exit pinch roll, and a turning pinch roll and sent to a welder. Among them, at least one grating is provided on the threading path between the straightener and the welder; Obtain second deviation data, where the second deviation data at least includes the looping height of the strip steel between the straightener and the shear entry pinch roll, the deviation amplitude between the center line of the strip steel and the rolling center line after the strip steel passes through the turning pinch roll for 1500 - 2000 mm, the torque of the straightener when the strip steel is sent to the welder, the grating signal, and the tension of the strip steel on the uncoiler; If any one of the second deviation data satisfies the second deviation determination condition, then a second anti-deviation action is performed in the strip steel threading stage.

2. The method according to claim 1, characterized in that, the first deviation determination condition at least includes: The number of loose coils on the outer ring of the steel coil is greater than or equal to 2 coils; The tension of the strip steel on the uncoiler is less than or equal to 17 KN; The amplitude of the unilateral deviation of the strip steel on the outer ring of the steel coil from the end of the steel coil is greater than or equal to 20 mm; The looping height of the strip steel between the entry pinch roll and the straightener is greater than or equal to 180 mm; The deviation amplitude between the center line of the strip steel and the rolling center line is greater than or equal to 30 mm.

3. The method according to claim 2, characterized in that, performing the first anti-deviation action in the strip steel uncoiling stage includes: Controlling the automatic step of the uncoiler to stop; Controlling the uncoiler to reverse at a speed of 30 m / min for 400 - 650 mm to eliminate the loose coils on the outer ring of the steel coil; Establishing the uncoiler tension and controlling the uncoiler tension to be maintained at 25 KN; Lifting the entry pinch roll and using the straightener to jog the strip steel forward at a speed of 30 m / min to a threading distance of 350 - 550 mm so as to eliminate the looping part of the strip steel between the entry pinch roll and the straightener; After the looping part of the strip steel between the entry pinch roll and the straightener is eliminated, controlling to jog the strip steel forward to a threading distance of 800 - 1000 mm; After controlling the strip to jog forward to a threading distance of 800 - 1000 mm, if the deviation amplitude between the center line of the strip and the rolling center line is less than or equal to 30 mm, then continue to pass the strip in the coil through the uncoiler, the anti - wrinkling roll, and the entry pinch roll in sequence to thread the strip in the coil to the straightener to continue the automatic uncoiling step; If the deviation amplitude between the center line of the strip and the rolling center line is greater than or equal to 35 mm, then under the condition that the distance between the edge of the strip and the straightener is greater than or equal to 35 mm, control the strip to jog forward at a speed of 15 m / min to the centering device, and use the centering device to align the strip.

4. The method according to claim 1, characterized in that, the second deviation determination condition at least includes: the looping height of the strip between the straightener and the entry pinch roll of the shear is greater than or equal to 230 mm; the deviation amplitude between the center line of the strip and the rolling center line after the strip passes through the turning pinch roll for 1500 - 2000 mm is greater than or equal to 30 mm; the torque of the straightener when the strip is threaded to the welder is greater than or equal to 90 N·m; the grating signal appears stroboscopic; the tension of the strip on the uncoiler is lower than 5% of the set value of the strip tension on the uncoiler.

5. The method according to claim 4, characterized in that, performing the second anti - deviation action during the strip threading stage includes: controlling the automatic uncoiling step to stop; aligning and clamping the strip through the centering device, and using group jogging to return the defective part of the strip to the slitting shear, and using the slitting shear to cut off the defective part.

6. The method according to claim 1, characterized in that, the cold rolling process of the strip further includes a strip feeding stage, the strip feeding stage is performed after the strip threading stage, and during the strip feeding stage, the method further includes: tightening the welded strip and threading it through the first deviation rectifying roll on the loop device, and obtaining the deviation rectifying roll value of the first deviation rectifying roll; if the deviation rectifying roll value of the first deviation rectifying roll exceeds ±50 mm, then open the first deviation rectifying roll pressure roll provided on the first deviation rectifying roll, and jog the strip forward at a speed of 30 m / min for 1 - 2 min; if the deviation rectifying roll value of the first deviation rectifying roll does not exceed ±50 mm, then jog the strip forward at a speed of 60 m / min; after the strip jogs forward a distance of 50 - 70 m, if the deviation rectifying roll value of the first deviation rectifying roll does not exceed ±50 mm, then jog the strip forward at a speed of 660 m / min.

7. The method according to claim 6, characterized in that, after the strip passes through the first deviation rectifying roll, the strip also passes through the second deviation rectifying roll and the third deviation rectifying roll on the loop device in sequence, and the method further includes: when the strip passes through the second deviation rectifying roll or the third deviation rectifying roll, obtaining the deviation rectifying roll value of the second deviation rectifying roll or the deviation rectifying roll value of the third deviation rectifying roll; if the deviation rectifying roll value of the second deviation rectifying roll or the deviation rectifying roll value of the third deviation rectifying roll exceeds ± 50 mm, then reduce the forward jogging speed of the strip from 660 m / min to 230 m / min; If the deviation roller values of the second deviation roller and the third deviation roller do not exceed ±50 mm, the speed of the strip jogging forward is restored to 660 m / min.

8. The method according to claim 7, wherein, the method further comprises: if the deviation roller value of the second deviation roller exceeds ±140 mm, an emergency stop is performed; controlling the speed of the strip passing through the pickling outlet on the loop equipment to decrease from 230 m / min to 120 m / min; increasing the inlet loop tension of the strip on the loop equipment by 15% of the set value of the inlet loop tension; if the deviation roller value of the second deviation roller does not exceed ±50 mm, the speed of the strip jogging forward is restored to 660 m / min.

9. The method according to claim 8, wherein, the control mode for the second deviation roller includes a remote control mode and a local control mode, and the method further comprises: in the remote control mode of the second deviation roller, if the deviation roller value of the second deviation roller exceeds ±180 mm, controlling the inlet loop and the outlet loop of the strip on the loop equipment to stop simultaneously, and switching the control mode of the second deviation roller from the remote control mode to the local control mode; controlling the strip to pass through the pickling outlet on the loop equipment at a speed of 30 m / min and a passing time of 1 - 2 min; if the deviation roller value of the second deviation roller does not exceed ±50 mm, restoring the control mode of the second deviation roller from the local control mode to the remote control mode, and controlling the speed of the strip passing through the pickling outlet on the loop equipment to be 230 m / min; when the loop amount on the inlet loop is less than 30% of the overall loop amount on the loop equipment, controlling the speed of the strip passing through the inlet of the loop equipment to be 230 m / min; after the strip where the weld of the strip is located completely enters and exits the loop, controlling the speed of the strip passing through the inlet of the loop equipment to be 660 m / min.

Images