A method and system for controlling over-limit width of incoming slab

Abstract

The present application provides a method and system for controlling the over-limit width of incoming slabs, including: detecting the slab width when the slabs are fed, determining the maximum and average values ​​of the width of the fed slabs; correcting the opening of the guide plates at the entrance and exit of the first rough rolling pass according to the maximum value of the width of the fed slabs; and correcting the opening of the vertical rollers at the first rough rolling pass and the length of the intermediate slab according to the average value of the width of the fed slabs. The present application can realize automatic detection of the width of the fed slabs, control the opening of the guide plates and vertical rollers at the rough rolling side according to the measured over-limit width of the incoming slabs, and avoid the slabs from hitting the scrap steel on the guide plates at the entrance of the rough rolling due to over-width or the vertical rollers from jamming the steel due to large rolling current.

Description

Technical Field

[0001] The present invention relates to the application field of intelligent steel production, and in particular to a method and system for controlling the over-limit width of incoming slabs. Background Art

[0002] The existing slab width detection instrument is not available for the hot coil production line of the steel mill when checking the loading of the slab. The slab planned width (theoretical slab width) can only be used for checking. Therefore, the steel rolling process does not know whether the actual width of the incoming slab from the steelmaking process exceeds the limit. The existing control technology does not have an effective method to detect whether the incoming slab width exceeds the limit. There is no effective alarm prompt when the incoming slab width exceeds the limit. In addition, during the production process, the slab is often too wide, hitting the scrap steel on the guide plate at the entrance of the rough rolling mill, or the first rolling current of the vertical roller is too large to block the steel, which affects the stable and smooth production. Summary of the invention

[0003] In view of the above problems existing in the prior art, the present invention proposes a method and system for controlling the over-limit width of incoming slabs, which mainly solves the problem that the existing control technology has no effective means to detect whether the width of the incoming slabs exceeds the limit, resulting in the incoming slabs hitting the guide plate on the rough rolling entrance side scrap steel or the vertical roller current being large and jamming the steel when the incoming slabs are over-width.

[0004] In order to achieve the above purpose and other purposes, the technical solution adopted by the present invention is as follows.

[0005] The present application provides a method for controlling the width of an incoming slab when it exceeds a certain limit, comprising:

[0006] When the slab is being loaded, the slab width is detected to determine the maximum and average values ​​of the loaded slab width;

[0007] The opening of the guide plates at the entrance and exit of the first rough rolling pass is corrected according to the maximum value of the width of the loading slab; and the opening of the vertical rolls in the first rough rolling pass and the length of the intermediate slab are corrected according to the average value of the width of the loading slab.

[0008] In one embodiment of the present application, before determining the maximum value and average value of the width of the loading slab, the method further includes:

[0009] The average value of the width of the loading slab is compared with the planned width value. If the deviation value between the average value of the width of the loading slab and the planned width value exceeds the preset threshold range, a preset warning message is output. In one embodiment of the present application, if the deviation value between the average value of the width of the loading slab and the planned width value exceeds the preset threshold range, a preset warning message is output, including:

[0010] If the deviation between the average value of the width of the loaded slab and the planned width exceeds the lower limit of the preset threshold range, a first warning message is output to enable the operator to check the slab or revoke the corresponding slab according to the first warning message;

[0011] If the deviation between the average value of the width of the loaded slab and the planned width value exceeds the upper limit of the preset threshold range, a second warning message is output to remind the operator to pay attention to the corresponding over-width slab.

[0012] In one embodiment of the present application, the calculation method of correcting the opening degree of the guide plate at the entrance side of the first pass of rough rolling according to the maximum value of the width of the loading slab includes:

[0013] K in =W max +F in +R in

[0014] Among them, K in Indicates the guide plate opening at the entrance side of the first pass of rough rolling; W max Indicates the maximum width of the loading slab; F in Indicates the opening margin on the inlet side; R in Indicates the inlet side guide plate correction amount.

[0015] In one embodiment of the present application, the calculation method of correcting the opening degree of the guide plate at the outlet side of the first rough rolling pass according to the maximum value of the width of the loading slab includes:

[0016] K out =W max +F out +R out

[0017] Among them, K out Indicates the opening degree of the guide plate at the exit side of the first pass of rough rolling; W max Indicates the maximum width of the loading slab; F out Indicates the outlet opening margin; R out Indicates the exit side guide plate correction amount.

[0018] In one embodiment of the present application, the calculation method of correcting the opening degree of the vertical rolls in the first pass of rough rolling according to the average value of the width of the loading slab includes:

[0019] E1=BD–FE / ME+(BR-BS)

[0020] Wherein, E1 represents the opening of the vertical roll; BD represents the slab width at the outlet side of the vertical roll in the first pass of rough rolling; FE represents the rolling force of the vertical roll in the first pass of rough rolling; ME represents the rigidity of the vertical roll mill; BR represents the average width of the slab to be fed; BS represents the planned width of the slab to be fed; Wherein:

[0021] FE=b1×HR(1)×(RE×DBE(1)) b2 ×K

[0022] Where, K is the adjustment coefficient; RE is the vertical roll radius; DBE(1) is the vertical roll reduction in the first rough rolling pass; HR(1) is the slab thickness at the entrance of the first rough rolling pass; b1 and b2 are the vertical roll rolling force adjustment coefficients.

[0023] In one embodiment of the present application, the calculation method of correcting the length of the intermediate billet of the first rough rolling pass according to the average value of the width of the loading slab includes:

[0024] BL=SW / (γ×BR×HR)

[0025] Among them, BL represents the length of the intermediate billet in the first pass of rough rolling; BR represents the average width of the loading slab; HR represents the target thickness of the intermediate billet in the first pass of rough rolling; SW represents the weight of the loading slab; γ represents the density of steel.

[0026] The present application also provides a control system for incoming slab width overrun, comprising:

[0027] The width detection module is used to detect the width of the slab when the slab is loaded, and determine the maximum and average widths of the loaded slab;

[0028] A guide plate opening correction module is used to correct the opening of the guide plates at the entrance and exit sides of the first rough rolling pass according to the maximum width of the loading slab;

[0029] The vertical roller and intermediate billet correction module is used to correct the vertical roller opening degree of the first rough rolling pass and the length of the intermediate billet according to the average value of the width of the loading slab.

[0030] As described above, the present application provides a method and system for controlling the over-limit width of incoming slabs, which has the following beneficial effects.

[0031] The present application detects the width of the slab when the slab is being fed, determines the maximum and average widths of the slab being fed; corrects the openings of the guide plates at the entrance and exit of the first rough rolling pass according to the maximum width of the slab being fed; and corrects the opening of the vertical rollers at the first rough rolling pass and the length of the intermediate slab according to the average width of the slab being fed. The present application can realize automatic detection of the width of the incoming slab in the steelmaking process, control the openings of the guide plates and vertical rollers at the entrance and exit of the rough rolling according to the actual measured width of the slab, and avoid the incoming slab being too wide and hitting the guide plate at the entrance of the rough rolling, causing scrap steel, or the vertical rollers causing large current jams. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a flow chart of a method for controlling the width overrun of incoming slabs in one embodiment of the present application.

[0033] Figure 2 This is a module diagram of a control system for excessive width of incoming slabs in one embodiment of the present application. DETAILED DESCRIPTION

[0034] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0035] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and thus the drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0036] In the existing control technology, the rough rolling side guide plate and the vertical roller opening setting calculation adopt the planned slab width. In the actual production process, the incoming slab in the steelmaking process is too wide or too narrow, resulting in the setting opening of the rough rolling side guide plate and the vertical roller not matching the actual slab width. When the actual width of the incoming slab is much larger than the planned width, the original control technology sets the rough rolling side guide opening too small, resulting in the slab hitting the rough rolling entrance side guide scrap steel, or the vertical roller first rolling current jamming steel; when the actual width of the incoming slab is much smaller than the planned width, due to the large setting opening of the vertical roller, the vertical roller cannot clamp the slab during the rough rolling process (the vertical roller passes empty), resulting in the rough rolling of the intermediate slab being too narrow, and the finishing rolling of the strip being too narrow overall or partially, affecting the product width quality control.

[0037] In order to solve the above problems existing in the prior art, the present application provides a method and system for controlling the over-limit width of incoming slabs. The technical solution of the present application is described in detail below in conjunction with specific embodiments.

[0038] See also Figure 1 , Figure 1 The flowchart of the method for controlling the width of incoming slabs in one embodiment of the present application is as follows. The method for controlling the width of incoming slabs in one embodiment of the present application comprises the following steps:

[0039] Step S100, performing slab width detection when the slab is loaded, and determining the maximum value and average value of the loaded slab width.

[0040] In one embodiment, a slab width gauge can be provided at the loading and checking roller of the heating furnace to measure the actual width of the slab when checking the loaded slab, and the maximum and average values ​​of the measured slab width are sent to the secondary system of the rolling line for storage. After the slab is discharged, it is used for setting the guide plate and vertical roller opening on the rough rolling inlet and outlet sides.

[0041] In one embodiment, before determining the maximum value and the average value of the width of the loading slab, the method further includes:

[0042] The average value of the width of the loaded slab is compared with the planned width value. If the deviation value between the average value of the slab width and the planned width value exceeds the preset threshold range, a preset warning message is output.

[0043] In one embodiment, if the deviation between the average value of the slab width and the planned width value exceeds a preset threshold range, a preset warning message is output, including:

[0044] If the deviation between the average value of the slab width and the planned width value exceeds the lower limit of the preset threshold range, a first warning message is output to enable the operator to check the slab or revoke the corresponding slab according to the first warning message;

[0045] If the deviation between the average value of the slab width and the planned width value exceeds the upper limit of the preset threshold range, a second warning message is output to remind the operator to pay attention to the corresponding over-width slab.

[0046] Specifically, when the slab is being loaded and checked, if the actual slab width exceeds the planned width (theoretical width) by more than ±50mm, an alarm prompt box "The width of the loaded slab is too wide (width difference >50mm) or too narrow (width difference <-50mm)" will pop up on the secondary check interface of the heating furnace. The operator will decide whether to check or revoke the slab. If the width difference of the loaded slab is <-50mm, the operator will directly revoke the slab, and checking and loading is not allowed (to avoid the overall or partial over-narrowness of the finished strip due to the over-narrow slab).

[0047] If the over-wide (width difference > 50mm) slab is loaded normally, when the slab is discharged for rough rolling at the preset timing, the rough rolling main monitoring screen will pop up an alarm prompt box "Incoming slab width is over-wide (width difference > 50mm)" to remind the rough rolling operator to pay attention to the over-width of the current discharged slab.

[0048] The width difference exceeds the limit range of ±50mm, which can be adjusted according to actual production application requirements and should not be regarded as a limitation to the embodiments of the present application.

[0049] Step S200, correcting the opening of the guide plates at the entrance and exit sides of the first rough rolling pass according to the maximum width of the loading slab.

[0050] In one embodiment, the opening setting value of the guide plate at the entrance and exit of the first pass of rough rolling is optimized according to the maximum measured slab width, and the opening setting value of the guide plate at the entrance and exit of the subsequent passes can be corrected by the measured width at the exit of the odd pass. In the prior art, the calculation method of the opening of the guide plate at the entrance of the first pass is: the opening of the guide plate at the entrance of the first pass = the entrance width of the vertical roller + the opening margin of the entrance side + the correction amount of the guide plate at the entrance side, where: the entrance width of the vertical roller is the planned width of the slab, the opening margin of the entrance side (steel biting direction) is set to 40mm, and the correction amount of the guide plate at the entrance side is set on the operator screen.

[0051] In one embodiment of the present application, the calculation method of correcting the opening degree of the guide plate at the entrance side of the first pass of rough rolling according to the maximum value of the width of the loading slab includes:

[0052] K in =W max +F in +R in

[0053] Among them, K in Indicates the guide plate opening at the entrance side of the first pass of rough rolling; W max Indicates the maximum width of the loading slab; F in Indicates the opening margin on the inlet side; R in It represents the correction amount of the guide plate on the entrance side, where: the entrance side opening margin (steel biting direction) is set to 40mm, and the entrance side guide plate correction amount is set on the operator screen.

[0054] In the prior art, the calculation method of the opening degree of the guide plate on the outlet side of the first pass is: the opening degree of the guide plate on the outlet side of the first pass = the setting value of the outlet width gauge + the outlet side opening degree margin + the outlet side guide plate correction value, wherein: the outlet side opening degree margin (steel throwing direction) is set to 80mm, and the outlet side guide plate correction value is set on the operator screen.

[0055] In one embodiment of the present application, the calculation method of correcting the opening degree of the guide plate at the outlet side of the first rough rolling pass according to the maximum value of the width of the loading slab includes:

[0056] K out =W max +F out +R out

[0057] Among them, K out Indicates the guide plate opening at the exit side of the first pass of rough rolling; W max Indicates the maximum width of the loading slab; F out Indicates the outlet opening margin; R outIndicates the correction amount of the guide plate on the exit side. In the formula: the exit side opening margin (steel throwing direction) is set to 80mm, and the exit side guide plate correction amount is set on the operator screen.

[0058] Step S300, correcting the opening of the vertical rolls in the first pass of rough rolling and the length of the intermediate billet according to the average value of the width of the loaded slab.

[0059] In one embodiment of the present application, the calculation method of correcting the opening degree of the vertical rolls in the first pass of rough rolling according to the average value of the slab width includes:

[0060] E1=BD–FE / ME+(BR-BS)

[0061] Wherein, E1 represents the opening of the vertical roll; BD represents the slab width at the outlet side of the vertical roll in the first pass of rough rolling; FE represents the rolling force of the vertical roll in the first pass of rough rolling; ME represents the rigidity of the vertical roll mill; BR represents the average width of the slab to be fed; BS represents the planned width of the slab to be fed; Wherein:

[0062] FE=b1×HR(1)×(RE×DBE(1)) b2 ×K

[0063] Where, K is the adjustment coefficient; RE is the vertical roll radius; DBE(1) is the vertical roll reduction in the first rough rolling pass; HR(1) is the slab thickness at the entrance of the first rough rolling pass; b1 and b2 are the vertical roll rolling force adjustment coefficients.

[0064] In one embodiment of the present application, the calculation method of correcting the length of the intermediate slab of the first pass of rough rolling according to the average value of the slab width includes:

[0065] BL=SW / (γ×BR×HR)

[0066] Among them, BL represents the length of the intermediate billet in the first pass of rough rolling; BR represents the average width of the slab; HR represents the target thickness of the intermediate billet in the first pass of rough rolling; SW represents the weight of the slab; and γ represents the density of steel.

[0067] Based on the above technical scheme of the present application, when the width of the incoming slab in the steelmaking process exceeds the limit, there will be an alarm prompt for the width exceeding the limit on the screen during the slab verification and steel discharge, which effectively increases the control method for the slab width exceeding the limit; it effectively solves the problem of the incoming slab width exceeding the limit (width difference > 50mm), the scrap steel hitting the guide plate on the rough rolling entrance side during the first rough rolling, or the large current jamming of the vertical roller in the first rolling pass; when the incoming slab width is too narrow (width difference <-50mm), the steel loading operator will directly revoke the slab in front of the furnace to avoid the intermediate slab and the finished strip being too narrow as a whole or partially too narrow due to the incoming slab width being too narrow.

[0068] See also Figure 2This embodiment also provides a control system for the width overrun of incoming slabs, which is used to execute the control method for the width overrun of incoming slabs described in the above method embodiment. Since the technical principle of the system embodiment is similar to that of the above method embodiment, the same technical details will not be repeated.

[0069] In one embodiment, a control system for incoming slab width exceeding limit includes: a width detection module 10, which is used to detect the slab width when the slab is loaded, and determine the maximum value and average value of the loaded slab width; a guide plate opening correction module 11, which is used to correct the opening of the guide plates at the entrance and exit sides of the first rough rolling pass according to the maximum value of the slab width; a vertical roller and intermediate billet correction module 12, which is used to correct the vertical roller opening of the first rough rolling pass and the length of the intermediate billet according to the average value of the slab width.

[0070] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A method for controlling the width of incoming slabs beyond the limit, characterized in that: include: When the slab is being loaded, the slab width is detected to determine the maximum and average values ​​of the loaded slab width; According to the maximum value of the width of the loading slab, the opening of the guide plates at the entrance and exit of the first rough rolling pass is corrected; and according to the average value of the width of the loading slab, the opening of the vertical rolls at the first rough rolling pass and the length of the intermediate slab are corrected; According to the maximum value of the width of the loading slab, the calculation method of the opening degree of the guide plate at the entrance side of the first pass of rough rolling is corrected, include: K in =W max +F in +R in Among them, K in Indicates the guide plate opening at the entrance side of the first pass of rough rolling; W max Indicates the maximum width of the loading slab; F in Indicates the opening margin on the inlet side; R in Indicates the correction amount of the guide plate on the inlet side; The calculation method of correcting the opening degree of the guide plate at the outlet side of the first rough rolling pass according to the maximum value of the width of the loading slab includes: K out =W max +F out +R out Among them, K out Indicates the guide plate opening at the exit side of the first pass of rough rolling; W max Indicates the maximum width of the loading slab; F out Indicates the outlet opening margin; R out Indicates the correction amount of the guide plate on the exit side; The calculation method of correcting the opening degree of the vertical rolls in the first pass of rough rolling according to the average value of the width of the loading slab includes: E1 = BD – FE / ME + (BR-BS) Wherein, E1 represents the opening of the vertical roll; BD represents the slab width at the outlet side of the vertical roll in the first pass of rough rolling; FE represents the rolling force of the vertical roll in the first pass of rough rolling; ME represents the rigidity of the vertical roll mill; BR represents the average width of the slab to be fed; BS represents the planned width of the slab to be fed; Wherein: FE = b1×HR(1)×(RE×DBE(1)) b2 ×K Where, K is the adjustment coefficient; RE is the vertical roller radius; DBE (1) is the vertical roller reduction in the first rough rolling pass; HR (1) is the slab thickness at the entrance of the first rough rolling pass; b1 and b2 are the vertical roller rolling force adjustment coefficients; The method for calculating the length of the intermediate billet in the first rough rolling pass is corrected according to the average value of the width of the loading slab, including: BL = SW / (γ×BR×HR) Among them, BL represents the length of the intermediate billet in the first pass of rough rolling; BR represents the average width of the loading slab; HR represents the target thickness of the intermediate billet in the first pass of rough rolling; SW represents the weight of the loading slab; γ represents the density of steel.

2. The method for controlling the width of incoming slabs as claimed in claim 1, characterized in that: Before determining the maximum and average width of the loading slab, it also includes: The average value of the width of the loading slab is compared with the planned width value. If the deviation value between the average value of the width of the loading slab and the planned width value exceeds a preset threshold range, a preset warning message is output.

3. The method for controlling the width of incoming slabs as claimed in claim 2, characterized in that: If the deviation between the average width of the loading slab and the planned width exceeds the preset threshold range, a preset warning message is output, including: If the deviation between the average value of the width of the loaded slab and the planned width exceeds the lower limit of the preset threshold range, a first warning message is output to enable the operator to check the slab or revoke the corresponding slab according to the first warning message; If the deviation between the average value of the width of the loaded slab and the planned width value exceeds the upper limit of the preset threshold range, a second warning message is output to remind the operator to pay attention to the corresponding over-width slab.

4. A control system for the width overrun of incoming slabs for executing the width overrun control method of incoming slabs according to any one of claims 1 to 3, characterized in that: include: The width detection module is used to detect the width of the slab when the slab is loaded, and determine the maximum and average widths of the loaded slab; A guide plate opening correction module is used to correct the opening of the guide plates at the entrance and exit sides of the first rough rolling pass according to the maximum width of the loading slab; The vertical roller and intermediate billet correction module is used to correct the vertical roller opening degree of the first rough rolling pass and the length of the intermediate billet according to the average value of the width of the loading slab.

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