A control method, device, equipment and medium for preventing single-edge breakage of a belt

Abstract

The application discloses a control method, device and equipment for preventing one-side break of a strip and a medium, and the method comprises the following steps: acquiring the actual thickness of the driving side and the operating side of the strip being rolled in a skin pass mill, and acquiring the actual tension of the driving side and the operating side of the strip at the outlet of the skin pass mill; calculating the thickness deviation between the actual thickness of the driving side and the actual thickness of the operating side, and calculating the tension deviation between the actual tension of the driving side and the actual tension of the operating side; if the thickness deviation is greater than a first preset deviation and / or the tension deviation is greater than a second preset deviation, the skin pass mill is controlled to be opened to prevent one-side break of the strip. The method can determine the existing one-side fold or lamination defects of the strip, and the skin pass mill can automatically open the rack and stop the rolling action when the state of the strip is abnormal, so that the one-side break of the strip in the region of the skin pass mill is effectively prevented.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of strip control, and in particular to a control method and device for preventing single-edge fracture of a strip, equipment and a medium. BACKGROUND

[0002] In a hot galvanizing unit, a skin pass mill is generally configured. The skin pass mill can effectively eliminate the yield platform of the material, improve the strength limit of the material, make the surface of the strip obtain the required roughness and gloss, and correct the shape of the plate. The control system of the skin pass mill is complex, including position, rolling force, elongation rate, tension and many other controlled quantities. In actual production, due to the poor plate shape of raw materials, improper process parameter adjustment, and non-standard equipment function precision, etc., the stress on both sides of the strip may be uneven, and then single-edge folding or lamination may occur. If effective measures are not taken in time, it will further develop into a serious accident of single-edge fracture, which not only damages the equipment and facilities, but also restricts the yield rate and production capacity of the unit.

[0003] At present, in order to prevent single-edge fracture of the strip in the skin pass mill area, the operator of the skin pass post generally continuously observes the shape of the strip at the outlet of the skin pass mill by visual observation, and immediately takes measures such as stopping the operation of the unit or quickly opening the skin pass mill after the strip is discharged abnormally. This method has the following problems: 1. The actual state of the strip is determined by manual operation, and there is no relatively scientific and unified criterion and basis, which is highly subjective and may cause misjudgment or misjudgment. 2. The production speed of the unit is fast, and manual operation has a lag, so the strip has often developed into single-edge fracture before the operator takes corresponding measures after discovering the abnormality. 3. The operator of the skin pass post also needs to consider the production processes such as tension leveling and passivation, and the labor intensity is high, so it is difficult to track and control the abnormal condition of the strip at all times. SUMMARY

[0004] The embodiments of the present application provide a control method, device, equipment and medium for preventing single-edge fracture of a strip. The method can determine the single-edge folding or lamination defects of the strip, and the skin pass mill automatically opens the rack and stops the rolling action when the state of the strip is abnormal, thereby effectively preventing the single-edge fracture of the strip in the skin pass mill area.

[0005] In a first aspect, an embodiment of the present application provides the following technical solutions:

[0006] A control method for preventing single-edge breakage of a strip, comprising: obtaining actual thicknesses of a driving side and an operating side of a strip being rolled in a skin pass mill, and obtaining actual tensions of the driving side and the operating side of the strip at an exit of the skin pass mill; calculating a thickness deviation between the actual thickness of the driving side and the actual thickness of the operating side, and calculating a tension deviation between the actual tension of the driving side and the actual tension of the operating side; if the thickness deviation is greater than a first preset deviation, and / or the tension deviation is greater than a second preset deviation, controlling opening of the skin pass mill to prevent single-edge breakage of the strip.

[0007] Preferably, before the obtaining actual thicknesses of a driving side and an operating side of a strip being rolled in a skin pass mill, the method further comprises: obtaining a running distance between a weld of the strip and the skin pass mill by a weld detection device and an incremental encoder at an entrance end of the skin pass mill; monitoring a first section of the strip based on the running distance, wherein the first section comprises a weld section of the strip; and compensating the first preset deviation when the first section is monitored to enter the skin pass mill.

[0008] Preferably, if the tension deviation continuously exceeds the second preset deviation within a first preset time period, the opening of the skin pass mill is controlled.

[0009] Preferably, before the obtaining actual tensions of a driving side and an operating side of a strip at an exit of a skin pass mill, the method further comprises: obtaining a running distance between a weld of the strip and the skin pass mill by a weld detection device and an incremental encoder at an entrance end of the skin pass mill; monitoring a second section of the strip based on the running distance, wherein the second section comprises a weld section of the strip; and compensating the second preset deviation when the second section is monitored to enter the skin pass mill.

[0010] Preferably, after the calculating a tension deviation between the actual tension of the driving side and the actual tension of the operating side, the method further comprises: calculating a change rate of the tension deviation of the driving side and the operating side of the strip based on the tension deviation; and controlling the opening of the skin pass mill if the change rate continuously exceeds a preset change rate within a second preset time period.

[0011] Preferably, before the calculating a change rate of the tension deviation of the driving side and the operating side of the strip based on the tension deviation, the method further comprises: obtaining a running distance between a weld of the strip and the skin pass mill by a weld detection device and an incremental encoder at an entrance end of the skin pass mill; monitoring a third section of the strip based on the running distance, wherein the third section comprises a weld section of the strip; and not performing the step of calculating the change rate of the tension deviation of the driving side and the operating side of the strip based on the tension deviation when the third section is monitored to enter the skin pass mill.

[0012] Preferably, the welding seam detection device and the incremental encoder at the inlet end of the skin pass mill are used to obtain the running distance between the welding seam of the strip and the skin pass mill, including: calculating a conversion constant and a preset distance correction coefficient according to the total number of pulses of the incremental encoder, the distance between the welding seam detection device and the skin pass mill, and the preset distance, and obtaining the running distance between the welding seam of the strip and the skin pass mill.

[0013] In a second aspect, the present application provides the following technical solutions through an embodiment of the present application:

[0014] A control device for preventing single-edge fracture of a strip, comprising:

[0015] An obtaining module is configured to obtain actual thicknesses of a driving side and an operating side of a strip being rolled in a skin pass mill, and to obtain actual tensions of the driving side and the operating side of the strip at an outlet of the skin pass mill;

[0016] A deviation calculating module is configured to calculate a thickness deviation between the actual thickness of the driving side and the actual thickness of the operating side, and to calculate a tension deviation between the actual tension of the driving side and the actual tension of the operating side;

[0017] A first control module is configured to control opening of the skin pass mill to prevent single-edge fracture of the strip when the thickness deviation is greater than a first preset deviation and / or the tension deviation is greater than a second preset deviation.

[0018] In a third aspect, the present application provides the following technical solutions through an embodiment of the present application:

[0019] An electronic device, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the method of any one of the first aspect when executing the program.

[0020] In a fourth aspect, the present application provides the following technical solutions through an embodiment of the present application:

[0021] A computer-readable storage medium having a computer program stored thereon, wherein the program is executable by a processor to implement the steps of the method of any one of the first aspect.

[0022] The one or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

[0023] The control method for preventing single-edge breakage of the strip provided by the embodiment of the present application obtains the actual thickness of the driving side and the operating side of the strip being rolled in the skin pass mill and the actual tension of the driving side and the operating side of the strip at the outlet of the skin pass mill, calculates the thickness deviation and the tension deviation of the driving side and the operating side, and controls the skin pass mill to open if the thickness deviation is greater than a first preset deviation and / or the tension deviation is greater than a second preset deviation. The method can determine the single-edge fold or the lamination defect that has occurred in the strip, so that the skin pass mill can automatically and quickly open the rack when the state of the strip is abnormal, stop the rolling action, effectively prevent the single-edge breakage of the strip in the skin pass mill area, reduce the damage to the equipment and facilities caused by the strip breakage accident and the processing time for subsequent recovery of production, and improve the production capacity of the unit. The method has unified determination criteria, can track the abnormal state of the strip in real time, and can realize high-standard automatic control. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0025] Figure 1 The flowchart of the control method for preventing single-edge breakage of the strip provided by the embodiment of the present application is shown in the figure.

[0026] Figure 2 The partial structure schematic diagram of the production line provided by the embodiment of the present application is shown in the figure.

[0027] Figure 3 The structure schematic diagram of the control logic provided by the embodiment of the present application is shown in the figure.

[0028] Figure 4 The structure schematic diagram of the control device for preventing single-edge breakage of the strip provided by the embodiment of the present application is shown in the figure.

[0029] Figure 5 The structure schematic diagram of the electronic device provided by the embodiment of the present application is shown in the figure.

[0030] Reference signs:

[0031] 10-skin pass mill; 20-strip; 30-strip weld; 40-weld detection device; 50-inlet tension roller; 60-incremental encoder; 70-outlet side tension roller; 80-tension sensor; 90-lower work roller; 100-lower support roller; 110-rolling hydraulic cylinder; 120-linear sensor; 130-electromagnetic reversing valve; 140-rod cavity; 150-rodless cavity. DETAILED DESCRIPTION

[0032] The embodiment of the present application provides a control method, device and equipment for preventing single-edge breakage of a strip, and a medium, the method can determine single-edge fold or lamination defects of a strip, and when the state of the strip is abnormal, the skin pass mill automatically opens a rack and stops rolling, so that the single-edge breakage of the strip in the skin pass mill region is effectively prevented.

[0033] The general idea of the technical scheme of the embodiment of the present application is as follows:

[0034] A control method for preventing single-edge breakage of a strip, comprising: acquiring actual thicknesses of a driving side and an operating side of a strip being rolled in a skin pass mill, and acquiring actual tensions of the driving side and the operating side of the strip at an outlet of the skin pass mill; calculating a thickness deviation between the actual thickness of the driving side and the actual thickness of the operating side, and calculating a tension deviation between the actual tension of the driving side and the actual tension of the operating side; if the thickness deviation is greater than a first preset deviation and / or the tension deviation is greater than a second preset deviation, controlling opening of the skin pass mill to prevent single-edge breakage of the strip.

[0035] In order to better understand the above technical scheme, the above technical scheme will be described in detail in combination with the accompanying drawings and specific embodiments.

[0036] It should be noted that the execution subject of the present application can be a main controller of the entire unit, for example, can be a PLC (programmable logic controller), hereinafter referred to as a unit PLC, and the skin pass mill in the present application includes a skin pass mill controller for controlling opening and closing of the skin pass mill, hereinafter referred to as a skin pass mill PLC.

[0037] In a first aspect, the present application provides a control method for preventing single-edge breakage of a strip, and specifically, Figure 1 as shown in the figure, the method comprises the following steps S101 to S103.

[0038] Step S101, acquiring actual thicknesses of a driving side and an operating side of a strip being rolled in a skin pass mill, and acquiring actual tensions of the driving side and the operating side of the strip at an outlet of the skin pass mill;

[0039] Step S102, calculating a thickness deviation between the actual thickness of the driving side and the actual thickness of the operating side, and calculating a tension deviation between the actual tension of the driving side and the actual tension of the operating side;

[0040] Step S103, if the thickness deviation is greater than a first preset deviation and / or the tension deviation is greater than a second preset deviation, controlling opening of the skin pass mill to prevent single-edge breakage of the strip.

[0041] In the specific implementation process, asFigure 2 As shown, the present application provides a linear sensor 120 for driving side and operating side rolling hydraulic cylinder of the skin pass mill 10, and the linear sensor 120 for driving side and operating side rolling hydraulic cylinder of the skin pass mill 10 is used to calculate the actual thickness of the strip 20 being rolled in the skin pass mill 10 on the driving side and the operating side. The PLC of the unit is connected with the linear sensor 120, and the actual thickness of the strip 20 being rolled in the skin pass mill 10 on the driving side and the operating side can be obtained.

[0042] Specifically, as shown, Figure 2 The skin pass mill 10 includes a lower work roll 90 and a lower backup roll 100, and based on the linear sensor 120 for driving side and operating side rolling hydraulic cylinder of the skin pass mill 10, the actual thickness of the strip 20 being rolled in the skin pass mill 10 on the driving side can be calculated, which can include: obtaining the distance between the top of the hydraulic cylinder and the rolling line when the rolling hydraulic cylinder 110 is fully retracted, i.e. the detection value of the linear sensor 120 in the hydraulic cylinder is 0; obtaining the analog input value of the linear sensor 120 in the driving side rolling hydraulic cylinder; measuring the radius of the lower backup roll of the skin pass mill and the diameter of the lower work roll of the skin pass mill.

[0043] Based on the distance between the top of the hydraulic cylinder and the rolling line, the analog input value, the preset distance conversion constant, the radius of the lower backup roll 100 and the diameter of the lower work roll 90, the actual thickness of the strip 20 being rolled in the skin pass mill 10 on the driving side can be calculated.

[0044] For example, the actual thickness of the strip 20 being rolled can be calculated according to the following relationship:

[0045] For the driving side:

[0046]

[0047] In the formula:

[0048] Thick_DR: the actual thickness of the driving side of the strip being rolled, in mm.

[0049] L_PL: the distance between the top of the hydraulic cylinder and the rolling line when the rolling hydraulic cylinder is fully retracted, i.e. the detection value of the linear sensor 120 in the hydraulic cylinder is 0, which is 1197.5 mm for the present unit.

[0050] R_BUR: the radius of the lower backup roll used by the skin pass mill, in mm.

[0051] D_WR: the diameter of the lower work roll used by the skin pass mill, in mm.

[0052] L_DR: the analog input value of the linear sensor 120 in the driving side rolling hydraulic cylinder when the skin pass mill is rolling.

[0053] K L: preset distance calculation conversion constant, the local group is 0.005, the unit is 1 / mm.

[0054] Similarly, for the operation side:

[0055]

[0056] In the formula:

[0057] Thick OP: the actual thickness of the operation side of the strip being rolled in the stand, the unit is mm.

[0058] L PL: the distance between the top of the rolling hydraulic cylinder and the rolling line when the rolling hydraulic cylinder is fully retracted, that is, the linear sensor 120 in the hydraulic cylinder detects 0, the local group is 1197.5 mm.

[0059] R BUR: the radius of the lower backup roll used by the finishing mill, the unit is mm.

[0060] D WR: the diameter of the lower work roll used by the finishing mill, the unit is mm.

[0061] L OP: the analog input value of the linear sensor 120 in the operation side rolling hydraulic cylinder when the finishing mill is rolling.

[0062] K L: preset distance calculation conversion constant, the local group is 0.005, the unit is 1 / mm.

[0063] The actual thickness of the drive side is subtracted from the actual thickness of the operation side to obtain the thickness deviation of both sides, and the state of the strip is determined according to the actual thickness deviation of the drive side and the operation side of the strip 20 being rolled in the finishing mill 10. If the thickness deviation is greater than the first preset deviation, that is:

[0064] |Thick DR―Thick OP|> first preset deviation

[0065] The strip 20 is determined to be out of shape, there is a serious wedge shape, or a single-sided wrinkle or a stack has occurred, that is, a single-sided rupture will occur, the machine group PLC sends a fast opening command to the finishing mill PLC, and the finishing mill PLC controls the finishing mill 10 to open.

[0066] As shown in Figure 2 When the finishing mill PLC receives the fast opening command sent by the machine group PLC, the electromagnetic reversing valve 130 of the drive side and the operation side rolling hydraulic cylinder is controlled to act, the rod cavity 140 is filled with oil, and the rod cavity 150 is returned to oil. The rolling hydraulic cylinder 110 is quickly retracted, the rolling action on the strip 20 is stopped, and the situation is prevented from further deteriorating, and a single-sided rupture accident of the strip 20 occurs.

[0067] If the thickness deviation is less than or equal to the first preset deviation, it indicates that the thickness difference between the drive side and the operation side of the strip steel 20 is small, and at this time the skin pass mill 10 is not controlled.

[0068] It should be noted that the size of the first preset deviation can be set according to the nominal thickness of the strip steel, so that the first preset deviation is proportional to the nominal thickness of the strip steel being rolled, so as to be applicable to strip steels of different thicknesses.

[0069] Specifically, the first preset deviation can be selected according to the following relationship:

[0070] C1 = K1 x Thick_Nom

[0071] In the formula:

[0072] C1: the first preset deviation, in mm.

[0073] K1: the first proportionality coefficient.

[0074] Thick_Nom: the nominal thickness of the strip steel, in mm.

[0075] Further, in order to avoid misjudgment and unnecessary fast opening action caused by normal thickness fluctuation due to weld thickening, before obtaining the actual thickness of the drive side and the operation side of the strip steel 20 being rolled in the skin pass mill 10, further comprising: obtaining the running distance between the strip steel weld 30 and the skin pass mill 10 through the weld detection device 40 and the incremental encoder 60 at the entrance end of the skin pass mill 10; monitoring the first section of the strip steel 20 based on the running distance, wherein the first section includes the strip steel weld 30 section; and compensating the first preset deviation when the first section is monitored to enter the skin pass mill 10.

[0076] In specific embodiments, as shown in Figure 2 The entrance end of the skin pass mill is provided with a weld detection device 40 and an incremental encoder 60, the weld detection device 40 is used to detect the strip steel weld 30, and the incremental encoder 60 in the present application is an incremental encoder 60 arranged at the entrance tension roller 50. The incremental encoder 60 can obtain the running length of the strip steel 20 by detecting the running speed of the strip steel 20.

[0077] Specifically, the running distance between the strip steel weld 30 and the skin pass mill 10 is obtained through the weld detection device 40 and the incremental encoder 60 at the entrance end of the skin pass mill, which can include: obtaining the running distance between the strip steel weld 30 and the skin pass mill 10 according to the total number of pulses of the incremental encoder 60, the distance between the weld detection device 40 and the skin pass mill 10, a preset conversion constant and a preset correction coefficient, wherein the total number of pulses of the incremental encoder 60 is the total number of pulses counted since the strip steel weld 30 passes through the weld detection device 40.

[0078] Specifically, with the skin-pass mill 10 as the reference point (coordinate zero point), the skin-pass mill inlet side is negative and the skin-pass mill outlet side is positive, the position of the strip weld 30 relative to the skin-pass mill 10 is obtained. For example, the position of the strip weld 30 is calculated according to the following formula:

[0079]

[0080] Where:

[0081] Pos_WS: The position of the strip weld relative to the skin pass mill, in m.

[0082] I_WS: The total number of encoder pulses counted since the steel weld passes through the weld detection device.

[0083] K_I: Preset distance calculation conversion constant, which is 4096 for this unit, and the unit is 1 / m.

[0084] Corr: Preset distance calculation correction coefficient, ranging from 0.98 to 1.02, and 1.01 for this unit.

[0085] D_WS_SPM: The distance between the weld inspection device installation point and the skin pass mill. For this unit, it is 118m.

[0086] Based on the travel distance (the position of the strip weld 30 relative to the skin-pass mill 10), the first section of the strip 20 is monitored. This first section includes the strip weld. In other words, knowing the travel distance between the strip weld 30 and the skin-pass mill 10 allows determination of whether the corresponding section has entered the skin-pass mill 10.

[0087] For example, the first section may be [-2.5m, +2.5m], that is, the weld section is at 0m, and the 2.5m before and after the weld section are both the first section.

[0088] In a specific embodiment, when the first section is detected entering the skin-pass mill 10, the first preset deviation is compensated to avoid misjudgment and unnecessary rapid opening caused by normal thickness fluctuations caused by weld thickening. When the thickness deviation is greater than the compensated first preset deviation, the skin-pass mill 10 is controlled to open. When the first section is detected leaving the skin-pass mill 10, the first preset deviation is restored. When the thickness deviation is greater than the first preset deviation, the skin-pass mill 10 is controlled to open.

[0089] For example, the first section is [−Am, +Bm], which means the strip enters from Am before the weld and flows out from Bm after the weld, with a total length of (A+B) m passing through the skin-pass mill 10 .

[0090] Specifically, the first preset deviation is compensated and increased, that is, the first proportional coefficient in the first preset deviation is increased, wherein the first proportional coefficient can be selected according to the following relationship:

[0091] In the first section, the preferred range of the first proportional coefficient is between 1.7 and 1.9, for example, the first proportional coefficient for this unit may be 1.8;

[0092] In sections other than the first section, the preferred range of the first proportional coefficient is between 1.4 and 1.5, for example, the first proportional coefficient for this unit may be 1.45.

[0093] In order to more accurately prevent unilateral breakage of the strip 20, while obtaining the actual thickness of the transmission side and the operating side of the strip 20 being rolled in the skin-pass mill 10, the actual tension of the transmission side and the operating side of the strip 20 at the outlet of the skin-pass mill 10 is also obtained; the tension deviation between the actual tension on the transmission side and the actual tension on the operating side is calculated; if the tension deviation is greater than the second preset deviation, the skin-pass mill 10 is controlled to open.

[0094] In a specific embodiment, Figure 2 As shown, the actual tensions on the transmission side and the operating side of the tension roller 70 at the outlet of the skin-polishing machine 10 are calculated using the tension sensors 80 on the transmission side and the operating side of the strip steel 20 at the outlet of the skin-polishing machine 10. Specifically, the actual tensions on the transmission side and the operating side of the strip steel 20 at the outlet of the skin-polishing machine 10 are calculated based on the analog input value of the tension sensor 80, the preset tension calculation conversion constant and the preset unit conversion constant.

[0095] For example, the actual tension of the steel strip 20 at the exit of the skin-pass mill 10 can be calculated according to the following relationship:

[0096] For the drive side:

[0097]

[0098] Where:

[0099] Ten_DR: The actual tension of the strip at the exit transmission side of the skin-pass mill, in kN.

[0100] T_DR: Analog input value of the tension sensor on the transmission side of the skin-finishing machine outlet.

[0101] K_T: Tension calculation conversion constant, which is 40000 for this unit, and the unit is N.

[0102] K_U: Unit conversion constant, which is 1000 for this unit.

[0103] For the operating side:

[0104]

[0105] In the formula:

[0106] Ten_OP: actual tension of the strip at the drive side of the outlet of the skin pass mill, in kN.

[0107] T_OP: analog input value of the sensor at the drive side of the outlet of the skin pass mill.

[0108] K_T: tension calculation conversion constant, 40000 in the machine set, in N.

[0109] K_U: unit conversion constant, 1000 in the machine set.

[0110] The actual tension at the drive side is subtracted from the actual tension at the operation side to obtain the tension deviation of the two sides. The state of the strip is determined according to the deviation of the actual tension at the drive side and the operation side of the strip 20 being rolled in the skin pass mill 10. When the deviation of the actual tension at the drive side and the operation side of the strip 20 at the outlet of the skin pass mill 10 is greater than a second preset deviation, i.e.:

[0111] |Ten_DR-Ten_OP|> second preset deviation

[0112] and lasts for a first preset time period, it is determined that the strip 20 is undergoing unilateral folding or lamination, and a fast opening command is sent from the machine set PLC to the skin pass mill PLC. For example, the first preset time period can be between 1 and 3 seconds, and in this application it can be 2 seconds.

[0113] If the deviation of the actual tension is less than or equal to the second preset deviation, or the duration of the deviation of the actual tension being greater than the second preset deviation is less than the first preset time period, the skin pass mill 10 is not controlled.

[0114] It should be noted that the size of the second preset deviation can be set according to the strength of the strip 20, so that the second preset deviation is proportional to the strength of the strip 20 being rolled, to adapt to strips 20 of different strengths.

[0115] Specifically, the second preset deviation can be selected according to the following relationship:

[0116]

[0117] In the formula:

[0118] C2: second preset deviation, in kN.

[0119] K2_N: second proportional coefficient corresponding to ordinary steel.

[0120] K2_L: second proportional coefficient corresponding to high-strength steel.

[0121] Ten_SP: Set tension of the strip at the exit of the skin pass mill, in kN.

[0122] Further, to avoid the misjudgment and unnecessary fast opening action caused by the normal tension fluctuation due to the mechanical property difference between the head and tail of the strip 20, before obtaining the actual tension of the driving side and the operating side of the strip 20 at the exit of the skin pass mill 10, it can also include: obtaining the running distance between the strip weld 30 and the skin pass mill 10 through the weld detection device 40 at the entrance end of the skin pass mill and the incremental encoder 60; monitoring the second section of the strip 20 based on the running distance, wherein the second section includes the strip weld section; when the second section is monitored to enter the skin pass mill 10, the second preset deviation is compensated.

[0123] For example, the second section can be [-60m, +60m], that is, the weld section is at 0m, and the 60m before and after the weld section are the second section.

[0124] In specific embodiments, when the second section is monitored to enter the skin pass mill 10, the second preset deviation is compensated to avoid the misjudgment and unnecessary fast opening action caused by the normal tension fluctuation due to the mechanical property difference between the head and tail of the strip 20, so that the skin pass mill 10 is controlled to open when the tension deviation is greater than the second preset deviation after compensation. When the second section is detected to leave the skin pass mill 10, the second preset deviation is restored, so that the skin pass mill 10 is controlled to open when the tension deviation is greater than the second preset deviation.

[0125] Specifically, the second preset deviation is compensated by increasing the second preset deviation, that is, increasing the second proportional coefficient in the second preset deviation, wherein the second proportional coefficient can be selected according to the following relationship:

[0126] In the second section, the preferred range of the second proportional coefficient corresponding to ordinary steel is between 0.35-0.4, for example: the machine set can be 0.36; the preferred range of the second proportional coefficient corresponding to high-strength steel is between 0.15-0.2, for example: the machine set can be 0.16.

[0127] In other sections except the second section, the preferred range of the second proportional coefficient corresponding to ordinary steel is between 0.25-0.3, for example: the machine set can be 0.28; the preferred range of the second proportional coefficient corresponding to high-strength steel is between 0.1-0.15, for example: the machine set can be 0.12.

[0128] Further, to more accurately prevent single-edge rupture of the strip, after calculating the tension deviation between the actual tension of the driving side and the actual tension of the operating side, it can also include: based on the tension deviation, calculating the change rate of the tension deviation of the driving side and the operating side of the strip 20; if the change rate is greater than a preset change rate, the skin pass mill 10 is controlled to open.

[0129] In specific embodiments, based on the tension deviation, the rate of change of the tension deviation of the driving side and the operating side of the strip 20 is calculated, including: The rate of change of the tension deviation is obtained, wherein Ten DR is the actual tension of the driving side, Ten OP is the actual tension of the operating side, and t is time.

[0130] If:

[0131]

[0132] and lasts for a second preset time period, it is determined that the strip 20 has a tendency to occur single-sided fold lamination, and a fast opening command is sent from the unit PLC to the skin pass mill PLC. For example, the second preset time period can be between 1 to 2 seconds, and in this application it can be 1.5 seconds.

[0133] If the rate of change of the actual tension deviation is less than or equal to the preset rate of change, or the duration of the rate of change of the actual tension deviation being greater than the preset rate of change is less than the second preset time period, the skin pass mill 10 is not controlled.

[0134] It should be noted that the size of the preset rate of change can be set according to the strength of the strip 20, so as to be suitable for strips 20 of different strengths.

[0135] Specifically, the preset rate of change can be selected according to the following relationship:

[0136]

[0137] In the formula:

[0138] C3: preset rate of change, unit: kN / s.

[0139] C2_N: preset rate of change corresponding to ordinary steel, unit: kN / s.

[0140] C3_H: preset rate of change corresponding to high-strength steel, unit: kN / s.

[0141] Further, to avoid false judgment and unnecessary fast opening action caused by normal tension change due to adjustment of process parameters near the weld, before calculating the rate of change of the tension deviation of the driving side and the operating side of the strip 20 based on the tension deviation, the running distance between the strip weld 30 and the skin pass mill 10 can also be obtained through the weld detection device 40 and the incremental encoder 60 at the entrance end of the skin pass mill. Based on the running distance, the third section of the strip 20 is monitored, wherein the third section includes the strip weld section; when it is monitored that the third section enters the skin pass mill 10, the step of calculating the rate of change of the tension deviation of the driving side and the operating side of the strip 20 based on the tension deviation is not performed.

[0142] For example, the third section can be [-15m, +75m], i.e. the weld section is at 0m, the first 15m before the weld section and the 75m after the weld section are the third section, wherein the front of the weld section refers to the direction of the strip 20, the front of the weld section in the direction of travel.

[0143] In a specific embodiment, when the third section is detected to enter the skin pass mill 10, the step of calculating the rate of change of the tension deviation of the driving side and the operating side of the strip 20 based on the tension deviation is not performed. When the second section is detected to exit the skin pass mill 10, the step of calculating the rate of change of the tension deviation of the driving side and the operating side of the strip 20 based on the tension deviation is continued to be performed.

[0144] Specifically, the preset rate of change can be selected according to the following relationship:

[0145] In other sections other than the third section, the preferred range of the preset rate of change corresponding to the ordinary steel is between 7.5-8kN / s, and the unit of the skin pass mill can be 7.8kN / s; the preferred range of the preset rate of change corresponding to the high-strength steel is between 12-12.5kN / s, and the unit of the skin pass mill can be 12.4kN / s.

[0146] In Figure 3 , the control logic of the present application for determining the single-sided fold or the lamination that has occurred, is occurring or will occur according to the actual thickness deviation, the actual tension deviation and the actual rate of change of the tension deviation of the strip on both sides, and generating the fast opening command of the skin pass mill 10 according to the determination result is further illustrated.

[0147] Specifically:

[0148] 1. When the single-sided fold or the lamination of the strip 20 has occurred, the actual thickness of the strip 20 is detected for control:

[0149] When the first section [-2.5m, +2.5m] of the strip 20 enters the skin pass mill 10, if the thickness deviation of the strip 20 is greater than 1.8 times the nominal thickness of the strip, the skin pass mill 10 is controlled to be opened; when other sections of the strip 20 enter the skin pass mill 10, if the thickness deviation is greater than 1.45 times the nominal thickness of the strip, the skin pass mill 10 is controlled to be opened.

[0150] 2. When the single-sided fold or the lamination of the strip 20 is occurring, the actual tension of the strip 20 is detected for control:

[0151] When the second section [-60m, +60m] of the strip steel 20 enters the skin pass mill 10, if the tension deviation of the strip steel 20 is greater than the set tension of 0.36 and lasts for 2 seconds, the skin pass mill 10 is controlled to be opened for the common steel; if the tension deviation of the strip steel 20 is greater than the set tension of 0.16 and lasts for 2 seconds, the skin pass mill 10 is controlled to be opened for the high-strength steel.

[0152] When other sections of the strip steel 20 enter the skin pass mill 10, if the actual tension deviation of the strip steel 20 is greater than the set tension of 0.28 and lasts for 2 seconds, the skin pass mill 10 is controlled to be opened for the common steel; if the actual tension deviation of the strip steel 20 is greater than the set tension of 0.12 and lasts for 2 seconds, the skin pass mill 10 is controlled to be opened for the high-strength steel.

[0153] 3. When the strip steel 20 is about to have a single-sided fold or a lamination, the control is performed by detecting the change rate of the tension deviation of the strip steel 20:

[0154] When other sections of the strip steel 20 except the section [-15m, +75m] enter the skin pass mill 10, if the change rate is greater than 7.8 and lasts for 1.5 seconds, the skin pass mill 10 is controlled to be opened for the common steel; if the change rate is greater than 12.4 and lasts for 1.5 seconds, the skin pass mill 10 is controlled to be opened for the high-strength steel.

[0155] In the above technical solutions, the weld detection device 40, the incremental encoder 60, the linear sensor 120 and the electromagnetic reversing valve 130 are all commercially available products, and the specific working principles and application solutions thereof can be known by the person skilled in the art according to the product manuals, which are not described herein.

[0156] According to the actual thickness deviation, the actual tension deviation and the actual tension deviation change rate of the strip steel, the present application can determine the single-sided fold or the lamination that has occurred, is occurring or will occur, so that the skin pass mill can be automatically and quickly opened to stop the rolling action when the strip steel state is abnormal, thereby effectively preventing the single-sided break of the strip steel in the skin pass mill area and ensuring the production capacity and the yield of the mill. Meanwhile, according to the characteristics of the head and tail of the strip steel, corresponding determination rules are additionally formulated to avoid unnecessary quick opening actions of the skin pass mill caused by misjudgment, reduce the number of non-skin pass products and ensure the yield of the mill.

[0157] The determination of the strip steel state and the execution of the quick opening action of the skin pass mill in the present application are all automatically completed by the control system without manual intervention, which not only overcomes the disadvantages of manual control but also reduces the labor intensity of the personnel and ensures the production process quality. Therefore, the present application can be widely used in the production control field of the skin pass mill area in the cold rolling industry.

[0158] In summary, the control method for preventing single-edge breakage of a strip provided by the embodiment of the present application can determine the single-edge fold or lamination defect of the strip, so that the mill automatically opens the rack and stops the rolling action when the state of the strip is abnormal, thereby effectively preventing the single-edge breakage of the strip in the area of the mill.

[0159] In a second aspect, based on the same inventive concept, the embodiment provides a control device for preventing single-edge breakage of a strip, as shown in the accompanying drawings, comprising: Figure 4

[0160] The acquisition module 401 is configured to acquire the actual thickness of the driving side and the operating side of the strip being rolled in the mill, and acquire the actual tension of the driving side and the operating side of the strip at the outlet of the mill.

[0161] The deviation calculation module 402 is configured to calculate the thickness deviation between the actual thickness of the driving side and the actual thickness of the operating side, and calculate the tension deviation between the actual tension of the driving side and the actual tension of the operating side.

[0162] The first control module 403 is configured to control the mill to open to prevent single-edge breakage of the strip if the thickness deviation is greater than a first preset deviation and / or the tension deviation is greater than a second preset deviation.

[0163] As an optional embodiment, the device further comprises:

[0164] The running distance acquisition module is configured to acquire the running distance between the strip weld and the mill through the weld detection device and the incremental encoder at the inlet end of the mill.

[0165] The first section monitoring module is configured to monitor the first section of the strip based on the running distance, wherein the first section comprises a strip weld section.

[0166] The first compensation module is configured to compensate the first preset deviation when the first section is monitored to enter the mill.

[0167] As an optional embodiment, the first control module 403 is specifically configured to control the mill to open if the tension deviation is greater than the second preset deviation for a first preset time period.

[0168] As an optional embodiment, the device further comprises:

[0169] The running distance acquisition module is configured to acquire the running distance between the strip weld and the mill through the weld detection device and the incremental encoder at the inlet end of the mill.

[0170] ​The second section monitoring module is configured to monitor a second section of the strip steel based on the running distance, wherein the second section comprises a strip steel weld seam section;

[0171] The second compensation module is configured to compensate the second preset deviation when the second section is monitored to enter the skin pass mill.

[0172] As an optional embodiment, the device further comprises:

[0173] The change rate calculation module is configured to calculate a change rate of the tension deviation of the driving side and the operating side of the strip steel based on the tension deviation.

[0174] The third control module is configured to control the skin pass mill to open if the change rate is greater than a preset change rate for a second preset time period.

[0175] As an optional embodiment, the device further comprises:

[0176] The running distance acquisition module is configured to acquire the running distance between the strip steel weld seam and the skin pass mill by a weld seam detection device at an entrance end of the skin pass mill and an incremental encoder.

[0177] The third section monitoring module is configured to monitor a third section of the strip steel based on the running distance, wherein the third section comprises a strip steel weld seam section.

[0178] The fourth control module is configured to not perform the step of calculating the change rate of the tension deviation of the driving side and the operating side of the strip steel based on the tension deviation when the third section is monitored to enter the skin pass mill.

[0179] As an optional embodiment, the running distance acquisition module is specifically configured to:

[0180] The running distance between the strip steel weld seam and the skin pass mill is acquired according to a total number of pulses of the incremental encoder, a distance between the weld seam detection device and the skin pass mill, a preset distance, a conversion constant calculated based on the preset distance, and a preset distance calculation correction coefficient, wherein the total number of pulses of the incremental encoder is a total number of pulses counted since the strip steel weld seam passes through the weld seam detection device.

[0181] The above modules can be implemented by software codes, and the above modules can be stored in a memory of a control device. The above modules can also be implemented by hardware, such as an integrated circuit chip.

[0182] The control device for preventing single-edge fracture of a strip steel provided by the embodiment of the present application has the same implementation principle and technical effects as the method embodiment, and for brevity, the part of the device embodiment not mentioned can be referred to the corresponding content in the method embodiment.

[0183] In a third aspect, based on the same inventive concept, the present embodiment provides an electronic device 500, comprising: a memory 501, a processor 502, and a computer program 503 stored in the memory and capable of running on the processor, wherein the processor 501 implements the steps of the control method for preventing single-sided breakage of a belt when executing the program. Figure 5 As shown, the electronic device 500 comprises: a memory 501, a processor 502, and a computer program 503 stored in the memory and capable of running on the processor, wherein the processor 501 implements the steps of the control method for preventing single-sided breakage of a belt when executing the program.

[0184] Although preferred embodiments of the application have been described herein, after further studying the drawings and detailed description, those skilled in the art will not have any difficulty in making additional modifications and changes to these embodiments. Therefore, the appended claims are intended to cover all such modifications and changes as falling within the scope of the application.

[0185] Obviously, those skilled in the art can make various modifications and variations to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and equivalent technologies thereof, the present application is also intended to include these modifications and variations.

Claims

1. A control method for preventing unilateral fracture of strip steel, characterized in that: include: Obtaining the actual thickness of the strip being rolled in the skin-pass mill on the drive side and the operating side, and obtaining the actual tension of the strip at the exit of the skin-pass mill on the drive side and the operating side; Calculating a thickness deviation between an actual thickness of the transmission side and an actual thickness of the operating side, and calculating a tension deviation between an actual tension of the transmission side and an actual tension of the operating side; After calculating the tension deviation between the actual tension on the transmission side and the actual tension on the operating side, the method further includes: calculating a change rate of the tension deviation between the transmission side and the operating side of the strip based on the tension deviation; If the change rate is continuously greater than the preset change rate within a second preset time period, it is determined that the strip has a tendency to have single-side wrinkles and laminations, and the skin-pass mill is controlled to open; If the thickness deviation is greater than a first preset deviation, it is determined that unilateral wrinkling or lamination has occurred on the steel strip, and the skin-pass mill is controlled to open to prevent unilateral breakage of the steel strip; If the tension deviation is greater than a second preset deviation, it is determined that the strip is experiencing unilateral wrinkling or lamination, and the skin pass mill is controlled to open to prevent unilateral breakage of the strip.

2. The method according to claim 1, wherein Before obtaining the actual thickness of the transmission side and the operating side of the strip being rolled in the skin-pass mill, the method further includes: The running distance between the strip weld and the skin-pass mill is obtained by using a weld detection device and an incremental encoder at the inlet end of the skin-pass mill; Based on the running distance, a first section of the steel strip is monitored, wherein the first section includes a steel strip weld section; When it is detected that the first section enters the skin-finishing machine, the first preset deviation is compensated.

3. The method according to claim 1, wherein If the tension deviation is continuously greater than the second preset deviation within the first preset time period, the skin-pass machine is controlled to be turned on.

4. The method according to claim 1, wherein Before obtaining the actual tension of the strip on the transmission side and the operating side at the skin-pass mill outlet, the method further includes: The running distance between the strip weld and the skin-pass mill is obtained by using a weld detection device and an incremental encoder at the inlet end of the skin-pass mill; Based on the running distance, a second section of the steel strip is monitored, wherein the second section includes a steel strip weld section; When it is detected that the second section enters the skin-finishing machine, the second preset deviation is compensated.

5. The method according to claim 1, wherein Before calculating the change rates of the tension deviations on the transmission side and the operating side of the strip based on the tension deviation, the method further includes: The running distance between the strip weld and the skin-pass mill is obtained by using a weld detection device and an incremental encoder at the inlet end of the skin-pass mill; Based on the running distance, a third section of the steel strip is monitored, wherein the third section includes a steel strip weld section; When it is detected that the third section enters the skin-pass mill, the step of calculating the rate of change of the tension deviation on the transmission side and the operating side of the strip based on the tension deviation is not performed.

6. The method according to claim 2, wherein The method of obtaining the running distance between the strip weld and the skin-pass mill by using the weld detection device at the inlet end of the skin-pass mill and the incremental encoder includes: The running distance between the strip weld and the skin pass mill is obtained based on the total number of pulses of the incremental encoder, the distance between the weld detection device and the skin pass mill, the preset distance calculation conversion constant, and the preset distance calculation correction coefficient, wherein the total number of pulses of the incremental encoder is the total number of pulses counted since the strip weld passes through the weld detection device.

7. A control device for preventing unilateral fracture of strip steel, characterized in that: include: an acquisition module for acquiring the actual thickness of the strip being rolled in the skin-pass mill on the transmission side and the operating side, and acquiring the actual tension of the strip at the skin-pass mill outlet on the transmission side and the operating side; a deviation calculation module, configured to calculate a thickness deviation between the actual thickness of the transmission side and the actual thickness of the operating side, and to calculate a tension deviation between the actual tension of the transmission side and the actual tension of the operating side; a first control module configured to determine that the steel strip has unilateral wrinkling or lamination if the thickness deviation is greater than a first preset deviation, and control the skin-pass mill to open to prevent unilateral breakage of the steel strip; and to determine that the steel strip is undergoing unilateral wrinkling or lamination if the tension deviation is greater than a second preset deviation, and control the skin-pass mill to open to prevent unilateral breakage of the steel strip; a change rate calculation module, configured to calculate the change rates of the tension deviations on the transmission side and the operating side of the strip based on the tension deviation; The third control module is used to determine that the strip steel has a tendency to have single-side wrinkles and laminations if the change rate continues to be greater than the preset change rate within a second preset time period, and control the skin pass mill to open.

8. An electronic device, characterized in that: include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the method according to any one of claims 1 to 6 when executing the program.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the steps of the method according to any one of claims 1 to 6 are implemented.

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