Control method, device and equipment of cold rolling production line and medium

Abstract

The invention discloses a control method, device and equipment for a cold rolling production line and a medium, and belongs to the technical field of metallurgy. The method comprises the following steps: acquiring a first distance between a defect on strip steel and a strip head and a second distance between the defect and a strip tail; determining a target length according to the first distance and the second distance; if the third distance between the defect and the main inlet of the rolling unit is reduced to the target length, the strip steel is sheared for the first time; after the first shearing operation is finished, the rolling unit is controlled to stop; after the defect is transferred to the main outlet of the rolling unit, if a fourth distance between the defect and the main outlet of the rolling unit meets a preset condition, the rolling unit is controlled to start; and after starting, when the thickness of the strip steel rolled by the rolling unit meets the preset requirement, second-time shearing operation is carried out. According to the method, normal strip steel can be cut off as little as possible, the strip steel waste amount is reduced, and meanwhile the strip breaking risk can be reduced.

Description

Technical Field

[0001] The present application relates to the field of metallurgical technology, and in particular to a control method, device, equipment and medium for a cold rolling production line. Background Art

[0002] As market competition intensifies and users' demands for cold-rolled products continue to rise, defect control in cold-rolled products is becoming increasingly crucial. Defects can originate from incoming hot-rolled materials, or they can be caused by a variety of factors, including malfunctions in the cold-rolling mill itself, improper operation, or inappropriate process parameter settings. These defects can lead to accidents such as strip breakage during rolling, impacting production line stability. Effective defect control can reduce the failure rate caused by quality defects during production, thereby lowering production costs and enhancing a company's market competitiveness.

[0003] In the prior art, when a steel strip has defects, an empty coil operation is performed, that is, the roll gap is not depressed when the defect passes through the rolling mill, and a portion of the steel strip with the defect is sheared off, thereby reducing the occurrence of accidents such as strip breakage.

[0004] However, when to shear the defective strip is entirely determined by the operator's subjective judgment. This sometimes results in shearing too early, resulting in increased strip waste, and sometimes shearing too late, so that when the defect enters the rolling mill, the roll gap of the rolling mill is still in a depressed state, increasing the risk of strip breakage. Summary of the Invention

[0005] In view of the above problems, the present application is proposed to provide a control method, device, equipment and medium for a cold rolling production line that solves the above problems. It can determine when the shearing operation can be performed to remove the defective part of the strip before the defect enters the rolling mill according to the position of the defect on the strip, so as to cut as little normal strip as possible, reduce the amount of strip waste, and at the same time reduce the risk of strip breakage.

[0006] In a first aspect, the present application provides a control method for a cold rolling production line, wherein the cold rolling production line includes a rolling mill, and the method includes:

[0007] Obtaining a first distance between a defect on the steel strip and the strip head, and a second distance between the defect and the strip tail;

[0008] determining a target length according to the first distance and the second distance;

[0009] If the third distance between the defect and the total entrance of the rolling mill group is reduced to the target length, performing a first shearing operation on the steel strip;

[0010] After the first shearing operation is completed, controlling the rolling mill to stop;

[0011] After the defect is transferred to the total outlet of the rolling mill group, if a fourth distance between the defect and the total outlet of the rolling mill group meets a preset condition, controlling the rolling mill group to start;

[0012] After the machine is started, when the thickness of the strip steel rolled by the rolling mill unit meets the preset requirements, a second shearing operation is performed.

[0013] Optionally, determining the target length according to the first distance and the second distance includes:

[0014] If the first distance is less than a preset first distance threshold and the second distance is greater than a preset second distance threshold, obtaining the length of the rolling mill group and taking the difference between the first distance threshold and the length as the target length;

[0015] If the first distance is greater than or equal to the first distance threshold and less than a preset third distance threshold, and the second distance is greater than the second distance threshold, then obtaining the length of the rolling mill group and using the difference between the first distance and the length as the target length;

[0016] If the first distance is greater than or equal to the third distance threshold and less than the second distance threshold, and the second distance is greater than the second distance threshold, then the difference between the first distance and the third distance threshold is used as the target length;

[0017] If the first distance is greater than or equal to the second distance threshold, obtaining the length of the rolling mill group, and taking the difference between the first distance threshold and the length as the target length;

[0018] The first distance threshold is smaller than the third distance threshold, and the third distance threshold is smaller than the second distance threshold.

[0019] Optionally, when the second distance is greater than or equal to the third distance threshold, the preset condition is:

[0020] The fourth distance is greater than or equal to a preset fourth distance threshold.

[0021] Optionally, after starting the vehicle, the method further includes:

[0022] When the second distance is greater than or equal to the preset three-distance threshold and less than the preset second distance threshold, after the defect is transferred to the total outlet of the rolling mill, if the weld between the strip steel roll where the defect is located and the next strip steel roll is transferred to the total outlet, the second shearing operation is performed.

[0023] Optionally, the rolling mill group includes a first rolling mill, a second rolling mill, a third rolling mill, a fourth rolling mill, and a fifth rolling mill arranged in sequence along the moving direction of the strip. When the thickness of the strip rolled by the rolling mill group is the first outlet thickness of the first outlet of the third rolling mill, the preset requirements include:

[0024] The similarity between the curve of the first outlet thickness changing with time and a preset first curve is greater than a preset first similarity threshold.

[0025] Optionally, when the thickness of the steel strip rolled by the rolling mill group is the second outlet thickness of the second outlet of the fifth rolling mill, the preset requirements include:

[0026] The similarity between the curve of the second outlet thickness changing with time and a preset second curve is greater than a preset second similarity threshold.

[0027] Optionally, obtaining a first distance between a defect on the steel strip and the strip head and a second distance between the defect and the strip tail includes:

[0028] Acquire a processing type of the defect on the steel strip, where the processing type includes empty coil processing and non-empty coil processing;

[0029] If the processing type is the empty coil processing, a first distance between the defect on the strip and the strip head and a second distance between the defect and the strip tail are obtained.

[0030] In a second aspect, the present application provides a control device for a cold rolling production line, the cold rolling production line including a rolling mill, the device comprising:

[0031] an acquisition module, configured to acquire a first distance between a defect on the steel strip and the strip head, and a second distance between the defect and the strip tail;

[0032] a determination module, configured to determine a target length based on the first distance and the second distance;

[0033] a first shearing module, configured to perform a first shearing operation on the steel strip if a third distance between the defect and the total entrance of the rolling mill group is reduced to the target length;

[0034] a first control module, configured to control the rolling mill to stop after the first shearing operation is completed;

[0035] a second control module, configured to control the rolling mill to start after the defect is transferred to the main outlet of the rolling mill group and if a fourth distance between the defect and the main outlet of the rolling mill group meets a preset condition;

[0036] The second shearing module is used to perform a second shearing operation after the vehicle is started and when the thickness of the strip steel rolled out by the rolling mill meets the preset requirements.

[0037] In a third aspect, the present application provides an electronic device comprising: a memory and a processor, wherein the memory and the processor are communicatively connected to each other, computer instructions are stored in the memory, and the processor executes the method described in the first aspect by executing the computer instructions.

[0038] In a fourth aspect, the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores computer instructions, and the computer instructions are used to enable the computer to execute the method described in the first aspect.

[0039] The technical solutions provided in the embodiments of this application have at least the following technical effects or advantages:

[0040] The present invention provides a control method, device, equipment, and medium for a cold rolling production line. The method obtains a first distance between a defect on a steel strip and the strip head, and a second distance between the defect and the strip tail, and characterizes the position of the defect using the first and second distances. The method determines a target length based on the first and second distances, i.e., determines the timing of shearing based on the position of the defect. If a third distance between the defect and the main entrance of the rolling mill decreases to the target length, the method performs a first shearing operation on the strip to prevent the defect from being transferred into the main entrance. After the first shearing operation is completed, the method stops the rolling mill, raises the roll gap, and does not roll the defect. After the defect is transferred to the main exit of the rolling mill, if a fourth distance between the defect and the main exit of the rolling mill meets a preset condition, the method starts the rolling mill, and then starts the rolling mill again according to the actual situation after the defect leaves the rolling mill. After starting the rolling mill, when the thickness of the strip rolled by the rolling mill meets the preset requirements, the method performs a second shearing operation to shear off the strip with unqualified thickness and the defective strip. This method can minimize the shearing of normal strip, reduce strip waste, and reduce the risk of strip breakage.

[0041] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. The same reference symbols are used throughout the drawings to represent the same components. In the drawings:

[0043] Figure 1 This is a structural diagram of a cold rolling production line provided in an embodiment of the present application;

[0044] Figure 2 This is a flow chart of a control method for a cold rolling production line provided in an embodiment of the present application;

[0045] Figure 3 This is a structural block diagram of a control device for a cold rolling production line provided in an embodiment of the present application. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solutions and advantages of the present application clearer, the implementation methods of the present application will be further described in detail below with reference to the accompanying drawings. It should be understood that the embodiments of the present disclosure and the specific features in the embodiments are detailed descriptions of the technical solutions of the present application, rather than limitations on the technical solutions of the present application. In the absence of conflict, the embodiments of the present application and the technical features in the embodiments can be combined with each other.

[0047] Before giving a detailed introduction to a control method for a cold rolling production line provided in an embodiment of the present application, a brief introduction to the implementation environment involved is first given.

[0048] Figure 1 This is a schematic diagram of the structure of a cold rolling production line provided in an embodiment of the present application. Figure 1 As shown, the cold rolling line includes a looper 1, a rolling mill 2, a flying shear 3, and a coiler 4. The arrow indicates the direction of strip movement. The area between the looper 1 and the rolling mill 2 is the total entrance area A of the rolling mill 2, and the area between the rolling mill 2 and the coiler 4 is the total exit area B of the rolling mill 2. If the rolling mill 2 is a six-high five-stand tandem mill, the rolling mill 2 includes a first rolling mill S1, a second rolling mill S2, a third rolling mill S3, a fourth rolling mill S4, and a fifth rolling mill S5.

[0049] The cold rolling production line refers to the pickling rolling unit, which adopts a six-roller five-stand continuous rolling mill and produces a special range of steel grades and specifications.

[0050] Empty coil refers to the coil produced by the empty coil operation when the strip is rolled without the rolling mill pressing down the roll gap and no rolling deformation occurs, and the strip passes through the rolling mill empty.

[0051] Defects refer to defects in hot rolling materials (raw materials) and defects generated during the cold rolling process.

[0052] A mill start-up occurs when unrolled strip (raw material) is present in the mill. After the mill start-up, parameters such as mill stand reduction are adjusted to achieve the target thickness of the rolled strip. The reduction ratio is the ratio between the raw material thickness and the target finished product thickness.

[0053] A looper is a device used to store strip steel and to buffer the connection between processes to prevent shutdown.

[0054] The total entrance area of ​​the rolling mill includes: deviation-correcting rollers (to prevent deviation), tension rollers (to establish tension), steering rollers (to turn the strip), and is equipped with monitoring equipment to collect video images.

[0055] The production line also includes: a thickness gauge (to detect thickness), a speed meter (to detect speed), a tension roller (to detect tension), and is equipped with monitoring equipment to collect video images.

[0056] The total exit area of ​​the rolling mill mainly includes: tension measuring roller (to detect exit tension and plate shape), steering roller (to turn strip steel), pinch roller (to assist in shearing and pushing strip steel), flying shear (to shear strip steel), coiler (to assist in core shaft coiling), coiler core shaft (to coil strip steel), thickness gauge (to detect thickness of finished product), coil trolley (to unload coils from high-position core shaft), coiler rotation (to switch between high and low-position core shafts), and is equipped with monitoring equipment to collect video images.

[0057] Figure 2 This is a flow chart of a control method for a cold rolling production line provided in an embodiment of the present application. Figure 1 As shown, the method includes:

[0058] Step S210: Obtain a first distance between a defect on the strip and the strip head, and a second distance between the defect and the strip tail.

[0059] In an embodiment of the present application, the position of the defect is pre-marked, and the first distance between the defect and the strip head is determined based on the position of the defect. The second distance between the defect and the strip tail can be calculated based on the total length of the strip and the first distance.

[0060] When marking defects, the defect conditions can be recorded from multiple dimensions. For example, the defect conditions can be marked from the eight dimensions shown in Table 1.

[0061] Table 1

[0062]

[0063]

[0064] Among them, strict defect observation is carried out, and ambiguous dimensions are marked according to the upper limit. The more comprehensive the information is, the better, which is conducive to controlling empty roll losses.

[0065] Step S220: Determine the target length according to the first distance and the second distance.

[0066] In the embodiment of the present application, in order to cut as little normal strip steel as possible, a better target length can be determined according to the location of the defect.

[0067] Step S230: If the third distance between the defect and the total entrance of the rolling mill is reduced to the target length, a first shearing operation is performed on the strip.

[0068] In the embodiment of the present application, the strip runs at a constant speed from the main inlet to the main outlet of the rolling mill. Therefore, the distance between the defect and the main inlet decreases. When the defect reaches the target length, the flying shear is controlled to perform the first shearing operation to cut the strip at the defective portion. The closer the defect is to the main inlet, the shorter the strip length will be, and the smaller the strip loss will be.

[0069] Step S240: After the first shearing operation is completed, the rolling mill is controlled to stop.

[0070] In the embodiment of the present application, after the first shearing operation is completed, an empty coil operation is performed, and the defective portion of the strip is not rolled, that is, the rolling mill is controlled to stop to raise the roll gap.

[0071] Step S250: After the defect is transferred to the total outlet of the rolling mill, if the fourth distance between the defect and the total outlet of the rolling mill meets a preset condition, the rolling mill is controlled to start.

[0072] In an embodiment of the present application, after parking, the strip will continue to run towards the main outlet. When the defect comes out of the main outlet and the fourth distance between the defect and the main outlet of the rolling mill meets the preset conditions, the rolling mill can be controlled to start and perform normal rolling.

[0073] During start-up, various rolling parameters are adjusted, for example, the starting speed is set to 60 m / min. Among the numerous rolling parameters, mill operators focus on checking two key categories: dimensional parameters (stock thickness, exit thickness, and exit width); and rolling parameters (rolling pressure distribution and tension distribution for each stand).

[0074] Step S260: After the machine is started, when the thickness of the strip steel rolled out by the rolling mill meets the preset requirements, a second shearing operation is performed.

[0075] In this embodiment of the present application, after the rolling mill is started, the roll gap is compressed, applying rolling force to the strip, causing the strip thickness to change. If the changed strip thickness meets the preset requirements, it indicates that qualified strip has been rolled. At this point, a second shearing operation can be performed to shear off the previously unqualified and defective scrap steel. After the second shearing operation, the rolling mill continues normal production. Throughout this process, the rolling mill does not experience any downward pressure defects, thereby reducing the risk of strip breakage.

[0076] Optionally, step S210 includes:

[0077] Obtain the processing type of the defect on the strip; if the processing type is empty coil processing, obtain the first distance between the defect on the strip and the strip head, and the second distance between the defect and the strip tail.

[0078] In the embodiments of the present application, the defect processing type can be determined based on multiple dimensions of defect information. The processing types include empty roll processing and non-empty roll processing. This determines which defects require empty roll processing and which require other processing, namely non-empty roll processing. Defects requiring empty roll processing can be processed using the methods of the embodiments of the present application.

[0079] Optionally, step S220 includes:

[0080] In the first step, if the first distance is less than a preset first distance threshold and the second distance is greater than a preset second distance threshold, the length of the rolling mill group is obtained, and the difference between the first distance threshold and the length is used as the target length.

[0081] In an embodiment of the present application, if the first distance is less than the preset first distance threshold and the second distance is greater than the preset second distance threshold, it means that the defect is near the head of the strip and very far away from the tail of the strip. In this case, when the third distance is reduced to the difference between the first distance threshold and the length of the rolling mill, the first shearing operation is performed to ensure that after the first shearing operation, the defect will not enter the main entrance before the parking is completed.

[0082] The length of the rolling mill and the preset stop length can be obtained. The sum of the rolling mill length and the stop length is used as the first distance threshold to ensure that defects have not entered the main entrance after the rolling mill is completely stopped. The stop length represents the length of the strip that can be run during the stop process.

[0083] Step 2: If the first distance is greater than or equal to the first distance threshold and less than the preset third distance threshold, and the second distance is greater than the second distance threshold, the length of the rolling mill is obtained, and the difference between the first distance and the length is used as the target length.

[0084] The third distance threshold can be the sum of the length of the rolling mill and the minimum pre-bundling length. The minimum pre-bundling length is determined based on the minimum post-bundling length in the coil length standard and the strip reduction rate. This means determining how long the pre-bundling strip is required to be rolled at the required reduction rate to produce a post-bundling strip with the minimum post-bundling length. Table 2 shows the corresponding relationship between the minimum post-bundling length, reduction rate, and minimum pre-bundling length.

[0085] Table 2

[0086] Reduction rate Minimum rolled length Minimum length before rolling 50％ 500m 250m 55％ 500m 225m 60％ 500m 200m 65％ 500m 175m 70％ 500m 150m 75％ 500m 125m 80％ 500m 100m 85％ 500m 75m

[0087] As shown in Table 2, the minimum length after rolling is 500m, the reduction rate is 50%, and the minimum length before rolling is 500 / (1-50%)=250m.

[0088] In an embodiment of the present application, if the first distance is greater than or equal to the first distance threshold and less than the preset third distance threshold, it means that the length of the normal strip between the defect and the strip head is not enough to roll out the strip with the minimum post-rolling length, and the defect is far away from the tail of the strip. In this case, the difference between the first distance and the length of the rolling mill is used as the target length, so that when the weld corresponding to the strip head is transferred to the main outlet, the first shearing operation is started, that is, shearing starts from the weld corresponding to the strip head, and the weld shearing and the defective strip shearing are completed with one shearing operation, thereby improving the shearing efficiency.

[0089] In the third step, if the first distance is greater than or equal to the third distance threshold and less than the second distance threshold, and the second distance is greater than the second distance threshold, the difference between the first distance and the third distance threshold is used as the target length.

[0090] The second distance threshold may be the sum of the first distance threshold and the minimum length before piercing.

[0091] In an embodiment of the present application, if the first distance is greater than or equal to the third distance threshold and less than the second distance threshold, it means that the length of the normal strip between the defect and the strip head is sufficient to roll out a strip after binding that meets the minimum length requirement, and the defect is far away from the tail of the strip. In this case, the normal strip of the minimum pre-binding length between the defect and the strip head is rolled, and then the first shearing operation is performed to improve the utilization rate of the strip and reduce the length of scrap steel.

[0092] Among them, parameters such as weld area, rack length, and parking length are taken into consideration when determining the target length, so as to minimize strip loss and find the best time to perform empty coil operation.

[0093] Step 4: If the first distance is greater than or equal to the second distance threshold, the length of the rolling mill is obtained, and the difference between the first distance threshold and the length is used as the target length.

[0094] In an embodiment of the present application, if the first distance is greater than or equal to the second distance threshold, it means that the defect is far away from the leader. In this case, the target length is sufficient to ensure that the defect will not enter the main entrance before stopping, that is, the first shearing operation is performed when the distance between the defect and the main entrance of the rolling mill is the stopping length.

[0095] The first distance threshold is smaller than the third distance threshold, and the third distance threshold is smaller than the second distance threshold. For example, if the parking length is 30 and the minimum pre-parking length is 50, then the first distance threshold is 80, the second distance threshold is 330, and the third distance threshold is 300.

[0096] Optionally, when the second distance is greater than or equal to the third distance threshold, the preset condition is:

[0097] The fourth distance is greater than or equal to a preset fourth distance threshold.

[0098] In this embodiment of the present application, if the defect is far from the tail of the strip, and regardless of the first distance between the defect and the strip head, the train is started after the defect leaves the main outlet, thereby completely processing the defective portion of the strip as scrap. The fourth distance threshold can be 0.

[0099] In the embodiment of the present application, when the second distance is less than the third distance threshold, it means that the distance between the defect and the strip tail is relatively close, and the normal strip steel between the defect and the strip tail is insufficient to be rolled into the tied strip steel that meets the minimum length requirement. Therefore, the normal strip steel between the defect and the strip tail can only be sheared as scrap steel. Finally, when the weld corresponding to the strip tail is transferred to the total outlet of the rolling mill, the starting operation can be performed, that is, all the strip steel between the strip tail weld and the defect is treated as scrap steel.

[0100] This means that during defect handling, if the defect is close to the strip tail, after the defect leaves the main exit, it is necessary to verify whether the weld is within the stand. If so, the operator must wait until the weld is removed from the rolling mill before starting the machine, allowing the weld to be unwound from the stand. Furthermore, after the defect leaves the main exit, it can be determined whether there is a weld between the stop length before the main entrance and the defect. If so, the operator must wait until the weld is removed from the rolling mill before starting the machine, allowing the weld to be unwound from the rolling mill.

[0101] Optionally, after starting the vehicle, the method further includes:

[0102] When the second distance is greater than or equal to the preset three-distance threshold and less than the preset second distance threshold, after the defect is transferred to the total outlet of the rolling mill, if the weld between the strip steel roll where the defect is located and the next strip steel roll is transferred to the total outlet, a second shearing operation is performed.

[0103] In an embodiment of the present application, when the second distance is greater than or equal to the preset three-distance threshold and less than the preset second distance threshold, that is, the strip between the defect and the tail of the strip is sufficient to be rolled into a strip that meets the minimum length requirement, but after rolling the strip of the minimum post-binding length, the weld corresponding to the tail of the strip is about to be transferred to the main outlet, and the weld needs to be sheared. Therefore, in this case, when the weld corresponding to the tail of the strip is transferred to the main outlet, the second shearing operation is performed so that the next roll of raw strip can be rolled into as many qualified post-binding strips as possible.

[0104] Optionally, when the thickness of the steel strip rolled by the rolling mill is the first outlet thickness of the first outlet of the third rolling mill, the preset requirements include:

[0105] The similarity between the curve of the first outlet thickness changing with time and the preset first curve is greater than a preset first similarity threshold.

[0106] In the embodiment of the present application, after the start of the machine, the raw material strip steel begins to be rolled normally, but the thickness of the strip steel rolled in the early stage may not meet the preset requirements. This part of the strip steel whose thickness does not meet the preset requirements will also be sheared off and treated as scrap steel. When judging whether the thickness of the rolled strip steel meets the requirements, the outlet thickness of the third rolling mill can be compared with the preset first target thickness, that is, the first outlet thickness is compared with the first target thickness. The comparison adopts the outlet thickness curve method, that is, the similarity of the curve of the first outlet thickness changing with time and the first curve of the first target thickness changing with time is compared. If the similarity is high, it means that the first outlet thickness meets the requirements, then the outlet thickness of the subsequent fourth and fifth rolling mills will basically meet the corresponding requirements. Therefore, in this case, the second shearing operation can be directly performed to cut off the strip steel with unqualified thickness in the front and leave the strip steel with qualified thickness in the back.

[0107] Optionally, when the thickness of the steel strip rolled by the rolling mill is the second outlet thickness of the second outlet of the fifth rolling mill, the preset requirements include:

[0108] The similarity between the curve of the second outlet thickness changing with time and the preset second curve is greater than a preset second similarity threshold.

[0109] In this embodiment of the present application, the second exit thickness of the fifth rolling mill can also be compared with the second target thickness to determine whether the thickness of the rolled strip meets the preset requirements, also using a curve comparison method. If the curve showing the second exit thickness changing over time is highly similar to the second curve showing the second target thickness changing over time, it indicates that the second exit thickness meets the requirements, and a second shearing operation can be performed to remove the strip with unqualified thickness and retain the strip with qualified thickness. The second shearing operation can be performed if either the first exit thickness or the second exit thickness meets the corresponding preset requirement.

[0110] In the embodiment of the present application, the relevant information of the scrap steel is filled in truthfully, including the reason for the scrap (for example, empty coil defect). If the cut length of the steel coil is less than the minimum length after bundling (for example, 500m), the reason for the length discrepancy can be truthfully noted.

[0111] The method in the embodiment of the present application can balance the shearing of the weld according to the different defect locations, so that the defect processing time is shortened to 2-3 minutes per time, reducing the loss by about 10-20% each time, and the annual economic benefit is 1.5 million yuan.

[0112] Based on the same application concept, the embodiment of the present invention also provides a control device for a cold rolling production line. Figure 3 This is a structural block diagram of a control device for a cold rolling production line provided in an embodiment of the present application. Figure 3 As shown, the apparatus 300 includes an acquisition module 301 , a determination module 302 , a first cutting module 303 , a first control module 304 , a second control module 305 and a second cutting module 306 .

[0113] An acquisition module 301 is configured to acquire a first distance between a defect on the strip and the strip head, and a second distance between the defect and the strip tail;

[0114] A determination module 302 is configured to determine a target length based on the first distance and the second distance;

[0115] A first shearing module 303 is configured to perform a first shearing operation on the strip if the third distance between the defect and the total entrance of the rolling mill is reduced to a target length;

[0116] The first control module 304 is used to control the rolling mill to stop after the first shearing operation is completed;

[0117] The second control module 305 is configured to control the rolling mill to start if a fourth distance between the defect and the total outlet of the rolling mill meets a preset condition after the defect is transferred to the total outlet of the rolling mill;

[0118] The second shearing module 306 is used to perform a second shearing operation after the rolling mill starts when the thickness of the strip steel rolled out by the rolling mill meets the preset requirements.

[0119] Optionally, the determining module 302 is further configured to:

[0120] If the first distance is less than a preset first distance threshold and the second distance is greater than a preset second distance threshold, obtaining the length of the rolling mill and taking the difference between the first distance threshold and the length as the target length;

[0121] If the first distance is greater than or equal to the first distance threshold and less than a preset third distance threshold, and the second distance is greater than the second distance threshold, the length of the rolling mill is obtained, and the difference between the first distance and the length is used as the target length;

[0122] If the first distance is greater than or equal to the third distance threshold and less than the second distance threshold, and the second distance is greater than the second distance threshold, then the difference between the first distance and the third distance threshold is used as the target length;

[0123] If the first distance is greater than or equal to the second distance threshold, the length of the rolling mill is obtained, and the difference between the first distance threshold and the length is used as the target length;

[0124] The first distance threshold is smaller than the third distance threshold, and the third distance threshold is smaller than the second distance threshold.

[0125] Optionally, when the second distance is greater than or equal to the third distance threshold, the preset condition is:

[0126] The fourth distance is greater than or equal to a preset fourth distance threshold.

[0127] Optionally, the apparatus 300 further includes a third shearing module, configured to:

[0128] When the second distance is greater than or equal to the preset three-distance threshold and less than the preset second distance threshold, after the defect is transferred to the total outlet of the rolling mill, if the weld between the strip steel roll where the defect is located and the next strip steel roll is transferred to the total outlet, a second shearing operation is performed.

[0129] Optionally, the rolling mill group includes a first rolling mill, a second rolling mill, a third rolling mill, a fourth rolling mill, and a fifth rolling mill arranged in sequence along the moving direction of the strip. When the thickness of the strip rolled by the rolling mill group is the first outlet thickness of the first outlet of the third rolling mill, the preset requirements include:

[0130] The similarity between the curve of the first outlet thickness changing with time and the preset first curve is greater than a preset first similarity threshold.

[0131] Optionally, when the thickness of the steel strip rolled by the rolling mill is the second outlet thickness of the second outlet of the fifth rolling mill, the preset requirements include:

[0132] The similarity between the curve of the second outlet thickness changing with time and the preset second curve is greater than a preset second similarity threshold.

[0133] Optionally, the acquisition module 301 is further configured to:

[0134] Obtaining the processing type of defects on the strip, which includes empty coil processing and non-empty coil processing;

[0135] If the processing type is empty coil processing, a first distance between the defect on the strip and the strip head and a second distance between the defect and the strip tail are obtained.

[0136] It can be understood that the device provided in the above embodiment is only illustrated by the division of the above functional modules. In actual applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0137] An embodiment of the present invention further provides an electronic device, which may include a processor and a memory, wherein the processor and the memory may be communicatively connected to each other via a bus or other means.

[0138] The processor may be a central processing unit (CPU), or an application specific integrated circuit (ASIC), or may be configured to implement one or more integrated circuits of the embodiments of the present application, or may be other general-purpose processors, digital signal processors (DSP), application specific integrated circuits (ASIC), field programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or combinations of the above chips.

[0139] The memory may include a large capacity memory for data or instructions. By way of example and not limitation, the memory may include a hard disk drive (HDD), a floppy disk drive, a flash memory, an optical disk, a magneto-optical disk, a magnetic tape, or a universal serial bus (USB) drive, or a combination of two or more of these. Where appropriate, the memory may include removable or non-removable (or fixed) media. Where appropriate, the memory may be internal or external to the electronic device. In certain embodiments, the memory may be a non-volatile solid-state memory.

[0140] In one embodiment, the memory may be a read-only memory (ROM). In one embodiment, the ROM may be a mask-programmable ROM, a programmable ROM (PROM), an erasable PROM (EPROM), an electrically erasable PROM (EEPROM), an electrically rewritable ROM (EAROM), or a flash memory, or a combination of two or more of these.

[0141] The processor implements any one of the control methods for the cold rolling production line in the above embodiments by reading and executing computer program instructions stored in the memory.

[0142] In one example, the electronic device may further include a communication interface and a bus. The processor, memory, and communication interface are connected via the bus and communicate with each other. The communication interface is primarily used to enable communication between the various modules, devices, units, and / or devices in the embodiments of this application. Where appropriate, the bus may include one or more buses.

[0143] In addition, in conjunction with the cold rolling line control method in the above embodiments, embodiments of the present invention may provide a computer-readable storage medium for implementation. The computer-readable storage medium stores computer program instructions; when executed by a processor, the computer program instructions implement any of the cold rolling line control methods in the above embodiments.

[0144] Those skilled in the art will appreciate that all or part of the processes in the above-mentioned embodiments can be implemented by instructing the relevant hardware through a computer program. The program can be stored in a computer-readable storage medium. When the program is executed, it can include the processes of the embodiments of the above-mentioned methods. The storage medium can be a read-only memory (ROM), a random access memory (RAM), a flash memory, a hard disk drive (HDD), or a solid-state drive (SSD). The storage medium can also include a combination of the above-mentioned types of memory.

[0145] The technical solutions in the above embodiments of the present application have at least the following technical effects or advantages:

[0146] The present invention provides a control method, device, equipment, and medium for a cold rolling production line. The method obtains a first distance between a defect on a steel strip and the strip head, and a second distance between the defect and the strip tail, and characterizes the position of the defect using the first and second distances. The method determines a target length based on the first and second distances, i.e., determines the timing of shearing based on the position of the defect. If a third distance between the defect and the main entrance of the rolling mill decreases to the target length, the method performs a first shearing operation on the strip to prevent the defect from being transferred into the main entrance. After the first shearing operation is completed, the method stops the rolling mill, raises the roll gap, and does not roll the defect. After the defect is transferred to the main exit of the rolling mill, if a fourth distance between the defect and the main exit of the rolling mill meets a preset condition, the method starts the rolling mill, and then starts the rolling mill again according to the actual situation after the defect leaves the rolling mill. After starting the rolling mill, when the thickness of the strip rolled by the rolling mill meets the preset requirements, the method performs a second shearing operation to shear off the strip with unqualified thickness and the defective strip. This method can minimize the shearing of normal strip, reduce strip waste, and reduce the risk of strip breakage.

[0147] In the description provided herein, numerous specific details are described. However, it is understood that embodiments of the present invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques are not shown in detail so as not to obscure the understanding of this description.

[0148] Similarly, it should be understood that in order to streamline the present disclosure and aid in understanding one or more of the various inventive aspects, in the above description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together into a single embodiment, figure, or description thereof. However, this disclosed method should not be interpreted as reflecting an intention that the claimed invention requires more features than are expressly recited in each claim. Rather, as reflected in the claims below, inventive aspects lie in less than all the features of the individual embodiments disclosed above. Accordingly, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of the invention.

[0149] It should be noted that the above embodiments illustrate rather than limit the invention, and that alternative embodiments may be devised by a person skilled in the art without departing from the scope of the appended claims. In the claims, any reference signs placed between brackets should not be construed as limiting the claims. The word "comprising" does not exclude the presence of components or steps not listed in the claims. The word "a" or "an" preceding a component does not exclude the presence of a plurality of such components. The present invention may be implemented by means of hardware comprising several different components and by means of a suitably programmed computer. In a unit claim enumerating several means, several of these means may be embodied by the same item of hardware. The use of the words first, second, and third etc. does not indicate any order. These words may be interpreted as names.

Claims

1. A control method for a cold rolling production line, characterized in that: The cold rolling production line includes a rolling mill train, and the method includes: Obtaining a first distance between a defect on the steel strip and the strip head, and a second distance between the defect and the strip tail; determining a target length according to the first distance and the second distance; If the third distance between the defect and the total entrance of the rolling mill group is reduced to the target length, performing a first shearing operation on the steel strip; After the first shearing operation is completed, controlling the rolling mill to stop; After the defect is transferred to the total outlet of the rolling mill group, if a fourth distance between the defect and the total outlet of the rolling mill group meets a preset condition, controlling the rolling mill group to start; After the machine is started, when the thickness of the strip steel rolled by the rolling mill unit meets the preset requirements, a second shearing operation is performed.

2. The control method of the cold rolling production line according to claim 1, characterized in that: The determining of the target length according to the first distance and the second distance includes: If the first distance is less than a preset first distance threshold and the second distance is greater than a preset second distance threshold, obtaining the length of the rolling mill group and taking the difference between the first distance threshold and the length as the target length; If the first distance is greater than or equal to the first distance threshold and less than a preset third distance threshold, and the second distance is greater than the second distance threshold, then obtaining the length of the rolling mill group and using the difference between the first distance and the length as the target length; If the first distance is greater than or equal to the third distance threshold and less than the second distance threshold, and the second distance is greater than the second distance threshold, then the difference between the first distance and the third distance threshold is used as the target length; If the first distance is greater than or equal to the second distance threshold, obtaining the length of the rolling mill group, and taking the difference between the first distance threshold and the length as the target length; The first distance threshold is smaller than the third distance threshold, and the third distance threshold is smaller than the second distance threshold.

3. The control method of the cold rolling production line according to claim 2, characterized in that: When the second distance is greater than or equal to the third distance threshold, the preset condition is: The fourth distance is greater than or equal to a preset fourth distance threshold.

4. The control method of the cold rolling production line according to claim 1, characterized in that: After starting the vehicle, the method further includes: When the second distance is greater than or equal to the preset three-distance threshold and less than the preset second distance threshold, after the defect is transferred to the total outlet of the rolling mill, if the weld between the strip steel roll where the defect is located and the next strip steel roll is transferred to the total outlet, the second shearing operation is performed.

5. The control method of the cold rolling production line according to claim 1, characterized in that: The rolling mill group includes a first rolling mill, a second rolling mill, a third rolling mill, a fourth rolling mill, and a fifth rolling mill arranged in sequence along the moving direction of the strip steel. When the thickness of the strip steel rolled by the rolling mill group is the first outlet thickness of the first outlet of the third rolling mill, the preset requirements include: The similarity between the curve of the first outlet thickness changing with time and a preset first curve is greater than a preset first similarity threshold.

6. The control method of the cold rolling production line according to claim 5, characterized in that: When the thickness of the steel strip rolled by the rolling mill group is the second outlet thickness of the second outlet of the fifth rolling mill, the preset requirements include: The similarity between the curve of the second outlet thickness changing with time and a preset second curve is greater than a preset second similarity threshold.

7. The control method of the cold rolling production line according to claim 1, characterized in that: The step of obtaining a first distance between a defect on the steel strip and the strip head and a second distance between the defect and the strip tail comprises: Acquire a processing type of the defect on the steel strip, where the processing type includes empty coil processing and non-empty coil processing; If the processing type is the empty coil processing, a first distance between the defect on the strip and the strip head and a second distance between the defect and the strip tail are obtained.

8. A control device for a cold rolling production line, characterized in that: The cold rolling production line includes a rolling mill unit, and the device includes: an acquisition module, configured to acquire a first distance between a defect on the steel strip and the strip head, and a second distance between the defect and the strip tail; a determination module, configured to determine a target length based on the first distance and the second distance; a first shearing module, configured to perform a first shearing operation on the steel strip if a third distance between the defect and the total entrance of the rolling mill group is reduced to the target length; a first control module, configured to control the rolling mill to stop after the first shearing operation is completed; a second control module, configured to control the rolling mill to start after the defect is transferred to the main outlet of the rolling mill group and if a fourth distance between the defect and the main outlet of the rolling mill group meets a preset condition; The second shearing module is used to perform a second shearing operation after the vehicle is started and when the thickness of the strip steel rolled out by the rolling mill meets the preset requirements.

9. An electronic device, characterized in that: include: A memory and a processor, wherein the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the method according to any one of claims 1 to 7 by executing the computer instructions.

10. A computer-readable storage medium, characterized in that The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable the computer to execute the method according to any one of claims 1 to 7.

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