A control method for assisting in recording the rolling process deviation of hot-rolled strip steel and application thereof

Abstract

The application discloses a kind of control method and application for assisting the record of hot-rolled strip steel rolling process deviation, and the position sensor installed in the entrance guide is used to track and record the deviation of the head and tail of the strip respectively.The strip appears deviation in the rolling stage, and friction and impact with the entrance guide, so that the position of the guide changes.The symbol of the guide device on the operation screen of the hot-rolling control system will change color accordingly, prompting the operator to make timely adjustments.The guide display symbol is added behind each rolling mill on the operation screen of the hot-rolling control system to record the deviation of the tail of the strip in each rolling mill, reminding the operator to make roll level adjustments.The system can accurately provide the deviation of the strip during threading and tail removal to the operator, making good adjustments for the next strip rolling, improving product quality and reducing the production of defective products.

Description

Technical Field

[0001] This invention belongs to the field of hot-rolled strip steel rolling technology, specifically relating to a control method for assisting in recording the offset during the hot-rolled strip steel rolling process. Background Technology

[0002] The main layout diagram of the operation screen for a modern hot strip mill is as follows: Figure 1 The diagram shows a frame consisting of support rolls and work rolls, along with a looper mechanism indicated by circles. The entrance guide for each mill stand is represented by two slightly upturned line segments, one above the other, symbolizing the drive side and the other the operating side. The primary function of the strip mill guide is to guide the direction and shape of the rolled strip. The guides are installed on both the front and rear sides of the mill. They are divided into entrance and exit guides, used to guide the direction of the rolled strip, ensuring that the strip enters and exits the mill according to the set position, direction, and condition, preventing the strip from getting tangled in the rolls and causing severe deviation at the head and tail of the strip. Generally, the width of the entrance guide changes according to the strip width (achieved by a width-adjusting hydraulic cylinder). The exit guide has a fixed opening that does not change with the strip width.

[0003] Because a position sensor is installed in the hydraulic cylinder for adjusting the width of the mill inlet guide, the opening degree of the inlet guide can be adjusted according to rolling requirements. The drive-side and operating-side guides can be activated separately, opening symmetrically on both sides along the rolling centerline to reach the desired rolling position. Since the inlet guide width adjustment hydraulic cylinder contains a position sensor, if the strip deviates during threading and tail-removal, it will rub against and impact the guide device, causing a change in the guide's position. Summary of the Invention

[0004] The purpose of this invention is to provide a control method and application for assisting in recording the deviation during the hot-rolled strip steel rolling process, so as to solve the problems mentioned in the background art.

[0005] The objective of this invention is achieved through the following technical solution: a control method for assisting in recording the offset during the hot-rolled strip steel rolling process, comprising the following steps:

[0006] By using a position sensor installed on the mill inlet guide, if the strip deviates during the rolling stage, it will rub and collide with the inlet guide, causing the guide position to change. The guide device symbol on the hot rolling control system operation screen will change color accordingly to prompt the operator to make timely adjustments.

[0007] S1. On the hot rolling control system operation screen, add a guide display symbol behind each mill to record the deviation of the strip tail at each mill.

[0008] S2. Based on the three stages of hot-rolled strip steel rolling: the strip threading stage, the stabilization rolling stage, and the tail removal stage, the alarm conditions for changes in the position of the inlet guide are specified respectively.

[0009] Furthermore, on the hot rolling control system operation screen, a set of symmetrical guide display symbols, marked as arrow 1, are added behind each stand to record the influence of strip tail deviation on the position of the inlet guide. Arrow 2, an inlet guide symbol, is added to the hot rolling control system operation screen to record the influence of strip deviation on the position of the inlet guide during strip threading and stable rolling.

[0010] Furthermore, during the strip threading stage: as the strip is threaded through each frame, the strip head passes through the frame one by one. When the actual position of the current frame entrance guide deviates from the actual position before the strip is threaded, the entrance guide on the deviated side will turn red.

[0011] Furthermore, in the stable rolling stage: during the stable rolling of the strip in the stand, the loading of the last stand is used as the trigger signal. If the actual position of the guide at the entrance of the stand in the continuous rolling mill deviates from the actual position when it is not loaded, the guide on the side of the stand with the deviation will flash orange / green to remind the operator to make adjustments until the operator reduces the deviation value to 0 through adjustments.

[0012] Furthermore, in the tailing stage: during the process of the strip tail leaving the rolling mill stand by stand, when the actual value of the guide at the entrance of the current stand deviates from its actual value when the strip is not threaded, the newly added guide graphic will turn the guide on the side where the deviation occurred red.

[0013] Furthermore, during the rolling interval, after the previous strip is rolled and before the next strip enters the descaling machine, the operation screen will display the unilateral displacement of the guide caused by the deviation during the strip threading and tail removal, as recorded by the automated basic control system, and turn the corresponding deviation-side guide red until the strip rolling tracking system is re-established, that is, the next strip enters the descaling machine.

[0014] Furthermore, when the actual position of the current rack entrance guide during the tape-threading stage deviates from the actual position before tape threading by more than +0.1mm, the entrance guide on the side with the deviation turns red.

[0015] Furthermore, in the continuous rolling mill during the stable rolling stage, if the actual position of the stand entrance guide deviates from its actual position when unloaded by more than +0.1mm, the guide on the side of the stand where the deviation occurs will flash orange / green.

[0016] When the actual value of the guide at the rack entrance derailment stage deviates from its actual value when it is not strapped by more than +0.1mm, the newly added guide graphic will turn the guide on the side with the deviation red.

[0017] An application of a control method for assisting in recording deviations during the hot-rolled strip steel rolling process is presented in a hot continuous strip steel production line equipped with mill inlet guides. Position sensors are installed on the mill inlet guides. If the strip steel deviates during the rolling stage, causing friction and impact with the inlet guide, and resulting in a change in the guide's position, the guide device symbol on the operation screen will change color accordingly, alerting the operator to make timely adjustments and ensuring high-quality, stable strip steel rolling.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0019] This invention utilizes position sensors installed on the mill inlet guides to track and record the deviation of the strip at the head and tail. When the strip deviates during the rolling stage, it rubs and collides with the inlet guide, causing the guide's position to change. The guide device symbol on the hot rolling control system's operation screen will change color accordingly, alerting the operator and reminding them to make timely adjustments.

[0020] This invention records changes in the guide position and displays them on the operation screen, promptly reminding operators to make corresponding adjustments, ensuring smooth rolling of strip steel, and avoiding severe deviation of the strip steel that leads to increased waviness and folding at the head and tail during rolling.

[0021] This invention changes the traditional method where operators can only visually observe strip deviation during rolling, enabling real-time monitoring of strip deviation. It also alerts operators to adjust the roll level. Furthermore, it accurately provides operators with information on strip deviation during threading and unthreading, allowing for advance adjustments for the next strip, thereby improving product quality and reducing defects. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the operation screen of the hot rolling control system of an existing hot strip rolling mill;

[0023] Figure 2 This is a schematic diagram of the arrow 1 / arrow 2 display symbols on the operation screen of the hot rolling control system of the present invention;

[0024] Figure 3 This is a schematic diagram showing the status during the strap-wearing stage of the present invention;

[0025] Figure 4 This is a schematic diagram showing the stable rolling stage of the present invention;

[0026] Figure 5 This is a schematic diagram showing the state during the tailing stage of the present invention;

[0027] Figure 6 This is a schematic diagram showing the rolling interval status of the present invention. Detailed Implementation

[0028] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention. Specific Implementation Example 1:

[0030] like Figure 1-6 As shown, a control method for assisting in recording the offset during the hot-rolled strip steel rolling process includes the following steps:

[0031] Position sensors are installed on the mill inlet guides, and the position sensors installed inside the inlet guides are used to track and record the deviation of the strip at the head and tail. When the strip deviates during the rolling stage, it rubs and collides with the inlet guide, causing the guide position to change. The guide device symbol on the hot rolling control system operation screen will change color accordingly to prompt the operator to make timely adjustments.

[0032] S1. On the hot rolling control system operation screen, add a guide display symbol behind each mill to record the deviation of the strip tail at each mill.

[0033] S2. Based on the three stages of hot-rolled strip steel rolling: the strip threading stage, the stabilization rolling stage, and the tail removal stage, the alarm conditions for changes in the position of the inlet guide are specified respectively.

[0034] On the hot rolling control system operation screen, a set of symmetrical guide display symbols, marked as arrow 1, are added behind each stand to record the impact of strip tail deviation on the position of the inlet guide. Arrow 2, an inlet guide symbol, is added to the hot rolling control system operation screen to record the impact of strip deviation on the position of the inlet guide during strip threading and stable rolling.

[0035] Strip threading stage: During the strip threading process of each frame, the strip head passes through the frame one by one. When there is a positional deviation between the actual value of the current frame entrance guide position and the actual value when the strip is not threaded, the entrance guide on the side with the deviation will turn red.

[0036] Stable rolling stage: During the stable rolling of strip steel in the stand, the loading of the last stand is used as the trigger signal. If the actual position of the guide at the entrance of the stand in the continuous rolling mill deviates from the actual position when it is not loaded, the guide on the side of the stand with the deviation will flash orange / green to remind the operator to make adjustments until the operator reduces the deviation value to 0.

[0037] Tail-off stage: As the strip steel enters the final stage of strip rolling, during the process of the strip steel tail leaving the mill stand by stand, if there is a deviation between the actual value of the guide at the entrance of the current stand and the actual value when it is not threaded with strip, the newly added guide graphic (behind the stand) will turn the guide on the side where the deviation occurred red.

[0038] During the rolling interval, after the previous strip is rolled and before the next strip enters the descaling machine, the operation screen will display the unilateral displacement of the guide caused by the deviation during the strip threading and tail removal, as recorded by the automated basic control system. The corresponding deviation-side guide will be turned red until the strip rolling tracking system is re-established, that is, the next strip enters the descaling machine.

[0039] When the actual position of the current rack entrance guide during the tape threading stage deviates from the actual position before tape threading by more than +0.1mm, the entrance guide on the side with the deviation turns red.

[0040] In the continuous rolling mill during the stable rolling stage, if the actual position of the stand entrance guide deviates from its actual position when unloaded by more than +0.1mm, the guide on the side of the stand where the deviation occurs will flash orange / green.

[0041] When the actual value of the guide at the rack entrance derailment stage deviates from its actual value when it is not strapped by more than +0.1mm, the newly added guide graphic will turn the guide on the side with the deviation red.

[0042] In the above embodiments, such as Figure 2 As shown, on the hot rolling control system operation screen, a set of guide display symbols is added behind each stand one by one. For example... Figure 2 As shown: Arrow 1 is a newly added display symbol used to record the impact of strip tail deviation on the position of the inlet guide. Arrow 2 points to the inlet guide symbol on the operation screen, recording the impact of strip deviation on the position of the inlet guide during strip threading and stable rolling.

[0043] like Figure 3 As shown, this is the display during the strip threading stage: During the strip threading process frame by frame, if the actual position of the current frame entrance guide deviates from the actual position before threading by more than +0.1mm, the entrance guide on the deviated side will turn red. For example... Figure 3As shown: During the threading process, the strip head impacts the operating side of frame F2 and the driving side of frame F3, causing the guide on this side to shift.

[0044] like Figure 4 As shown, this is the stable rolling stage: During the stable rolling of the strip in the mill, the loading of the last mill stand serves as the trigger signal (the last mill stand generates a rolling force exceeding 5MN). If, at this time, the actual position of the guide at the entrance of a certain mill stand deviates from its unloaded position by more than +0.1mm, the guide on the deviated side will flash orange / green to alert the operator. The flashing will stop when the deviation value decreases to 0, and the screen will return to its initial color.

[0045] like Figure 5 As shown, during the strip tail removal stage: as the strip tail leaves the rolling mill stand by stand, if the actual value of the guide at the current stand entrance deviates from the actual value before strip threading by more than +0.1mm, the newly added guide display graphic will correspondingly turn the guide on the deviated side red. For example... Figure 5 As shown: During the descaling process, the entry guides on the operating side of frames F2 and F4 shifted position, and the entry guides on the drive side of frames F3 / F5 shifted position. This display scheme is maintained until the next strip enters the descaling machine.

[0046] like Figure 6 As shown, the rolling interval display shows that during the rolling interval (when the previous strip is finished rolling and the next strip has not yet entered the descaling machine), the operation screen displays the unilateral displacement of the guides caused by strip deviation during threading and tail removal, respectively, through the inlet guide and newly added guide symbols. Figure 6 As shown, this indicates that the drive-side guides on stands F2 and F4 shift during strip tail removal, while on stands F3 and F5, the strip head impacts the drive-side guides during strip threading, causing guide displacement. This display allows operators to adjust the corresponding stand leveling values ​​to improve strip centering during threading and tail removal, preventing strip head overlap and waviness defects, reducing strip tail slippage, avoiding roll marks, improving strip surface quality, and extending roll life.

[0047] The above embodiments change the situation where operators can only visually observe strip deviation during the rolling process, enabling real-time monitoring of strip deviation. They also remind operators to adjust the roll level. Furthermore, they accurately provide operators with information on strip deviation during threading and unthreading, allowing for advance adjustments for the next strip rolling, thereby improving product quality and reducing defective products. Specific Implementation Example 2:

[0049] An application of a control method for assisting in recording deviations during the hot-rolled strip steel rolling process is presented in a hot continuous strip steel production line equipped with mill inlet guides. Position sensors are installed on the mill inlet guides. If the strip steel deviates during the rolling stage, causing friction and impact with the inlet guide, and resulting in a change in the guide's position, the guide device symbol on the operation screen will change color accordingly, alerting the operator to make timely adjustments and ensuring high-quality, stable strip steel rolling.

[0050] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0051] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A method for controlling the offset during the hot-rolled strip steel rolling process, characterized in that, Includes the following steps: By using a position sensor installed on the mill inlet guide, if the strip deviates during the rolling stage, it will rub and collide with the inlet guide, causing the guide position to change. The guide device symbol on the hot rolling control system operation screen will change color accordingly to prompt the operator to make timely adjustments. S1. On the hot rolling control system operation screen, add a guide display symbol behind each mill to record the deviation of the strip tail at each mill. S2. Based on the three stages of hot-rolled strip steel rolling: the strip threading stage, the stabilization rolling stage, and the tail removal stage, the alarm conditions for changes in the position of the inlet guide are specified respectively.

2. The method for controlling the offset during the hot-rolled strip steel rolling process as described in claim 1, characterized in that, On the hot rolling control system operation screen, a set of symmetrical guide display symbols, marked as arrow 1, are added behind each stand to record the impact of strip tail deviation on the position of the inlet guide. Arrow 2, an inlet guide symbol, is added to the hot rolling control system operation screen to record the impact of strip deviation on the position of the inlet guide during strip threading and stable rolling.

3. The method for controlling the offset during the hot-rolled strip steel rolling process as described in claim 2, characterized in that, During the strip threading stage: as the strip is threaded through each frame, the head of the strip passes through the frame one by one. When the actual position of the current frame entrance guide deviates from the actual position before the strip is threaded, the entrance guide on the side with the deviation will turn red.

4. The method for controlling the offset during the hot-rolled strip steel rolling process as described in claim 3, characterized in that, The stable rolling stage: During the stable rolling of the strip in the stand, the loading of the last stand is used as the trigger signal. If the actual position of the guide at the entrance of the stand in the continuous rolling mill deviates from the actual position when it is not loaded, the guide on the side of the stand with the deviation will flash orange / green to remind the operator to make adjustments until the operator reduces the deviation value to 0.

5. The method for controlling the offset during the hot-rolled strip steel rolling process as described in claim 4, characterized in that, During the tailing stage: when the strip tail leaves the rolling mill stand by stand, if the actual value of the guide at the entrance of the current stand deviates from its actual value when it is not threaded with strip, the newly added guide graphic will turn the guide on the side where the deviation occurred red.

6. The method for controlling the offset during the hot-rolled strip steel rolling process according to claim 5, characterized in that, During the rolling interval, after the previous strip is rolled and before the next strip enters the descaling machine, the operation screen will display the unilateral displacement of the guide caused by the deviation during the strip threading and tail removal, as recorded by the automated basic control system. The corresponding deviation-side guide will be turned red until the strip rolling tracking system is re-established, that is, the next strip enters the descaling machine.

7. The method for controlling the offset during the hot-rolled strip steel rolling process according to claim 3, characterized in that, When the actual position of the current rack entrance guide during the strapping stage deviates from the actual position before strapping by more than +0.1mm, the entrance guide on the side with the deviation turns red.

8. The method for controlling the offset during the hot-rolled strip steel rolling process according to claim 4, characterized in that, In the continuous rolling mill during the stable rolling stage, if the actual position of the stand entrance guide deviates from its actual position when unloaded by more than +0.1mm, the guide on the side of the stand where the deviation occurs will flash orange / green. When the actual value of the current rack entrance guide deviates from its actual value when it is not strapped by more than +0.1mm during the tailing stage, the newly added guide graphic will turn the guide on the side with the deviation red.

9. An application of the control method for assisting in recording the offset during the hot-rolled strip steel rolling process according to any one of claims 1-8, characterized in that, The control method for assisting in recording deviations during the hot-rolled strip steel rolling process is applied to a hot continuous strip steel production line equipped with mill inlet guides. By using position sensors installed on the mill inlet guides, if the strip steel deviates during the rolling stage and rubs and collides with the inlet guide, causing a change in the guide's position, the guide device symbol on the operation screen will change color accordingly, prompting the operator to make timely adjustments and ensuring high-quality and stable strip steel rolling.

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