CN116371940A - A control method, device, equipment and medium for preventing unilateral fracture of strip steel - Google Patents

Abstract

The invention discloses a control method, a device, equipment and a medium for preventing single-side fracture of strip steel, wherein the method comprises the following steps: the method comprises the steps of obtaining actual thicknesses of a transmission side and an operation side of strip steel being rolled in a finishing machine, and obtaining actual tensions of the transmission side and the operation side of the strip steel at an outlet of the finishing machine; calculating a thickness deviation between an actual thickness of the transmission side and an actual thickness of the operation side, and calculating a tension deviation between an actual tension of the transmission side and an actual tension of the operation side; if the thickness deviation is larger than the first preset deviation and/or the tension deviation is larger than the second preset deviation, the finishing machine is controlled to be opened so as to prevent the single-side fracture of the strip steel. The method can judge defects such as unilateral folds or lamination and the like of the strip steel, so that the frame is automatically opened when the state of the strip steel is abnormal, the rolling action is stopped, and unilateral breakage of the strip steel in the area of the finishing machine is effectively prevented.

Description

A control method, device, equipment and medium for preventing unilateral fracture of strip steel

technical field

The invention relates to the technical field of strip steel control, in particular to a control method, device, equipment and medium for preventing unilateral fracture of strip steel.

Background technique

In the hot-dip galvanizing unit, a skin pass machine is generally equipped. The skin pass machine can effectively eliminate the yield plateau of the material, increase the strength limit of the material, obtain the required roughness and gloss on the surface of the strip, and correct the shape of the plate. The control system of the skin pass mill is complex, including many controlled variables such as position, rolling force, elongation and tension. In actual production, due to reasons such as poor raw material plate shape, improper adjustment of process parameters, and substandard equipment function accuracy, the force on both sides of the strip may be uneven, resulting in unilateral folds or laminations. If effective measures are not taken in time, it will further develop into a serious accident of unilateral fracture, which will not only damage the equipment and facilities, but also restrict the yield and production capacity of the unit.

At present, in order to prevent the unilateral fracture of the steel strip in the skin-pass mill area, the operator of the skin-pass mill generally continuously observes the shape of the strip steel at the exit of the skin-pass mill through visual inspection. Light machine and other measures. This method has the following problems: 1. The determination of the actual state of the steel strip depends on manual work. There is no relatively scientific and unified criterion and basis, and it is highly subjective, which may cause missed or misjudgment. 2. The production speed of the unit is fast, and there is a lag in manual operation. After an abnormality is found, the strip steel often develops into a unilateral fracture before the operator takes corresponding measures. 3. The operators in the finishing position also need to take into account the production processes such as tension leveling and passivation. The labor intensity is high, and it is difficult to track and control the abnormal conditions of the strip all the time.

Contents of the invention

The embodiment of the present application provides a control method, device, equipment and medium for preventing unilateral fracture of strip steel. The time machine automatically opens the frame and stops the rolling action, thus effectively preventing the unilateral fracture of the strip steel in the skin pass machine area.

In the first aspect, the present invention provides the following technical solutions through an embodiment of the present invention:

A control method for preventing unilateral fracture of strip steel, comprising: obtaining the actual thickness of the driving side and the operating side of the strip being rolled in a skin pass mill, and obtaining the transmission side and the operating side of the strip steel at the exit of the skin pass mill Actual tension on the operating side; calculating a thickness deviation between the actual thickness of the drive side and the actual thickness of the operating side, and calculating a tension deviation between the actual tension on the drive side and the actual tension on the operating side ; The thickness deviation is greater than the first preset deviation, and/or the tension deviation is greater than the second preset deviation, then control the opening of the skin pass machine to prevent unilateral fracture of the strip.

Preferably, before obtaining the actual thickness of the driving side and the operating side of the strip being rolled in the skin pass mill, it also includes: obtaining the weld seam thickness of the strip steel through the weld seam detection device at the entrance end of the skin pass mill and an incremental encoder. The running distance between the seam and the skin pass machine; based on the running distance, the first section of the strip is monitored, wherein the first section includes the strip weld section; When the first section enters the finishing machine, the first preset deviation is compensated.

Preferably, if within the first preset time period, the tension deviation is continuously larger than the second preset deviation, the skin finishing machine is controlled to be turned on.

Preferably, before the acquisition of the actual tension of the driving side and the operating side of the strip at the exit of the skin pass machine, it also includes: obtaining the weld seam of the strip steel through the weld seam detection device and the incremental encoder at the entrance end of the skin pass machine and the running distance between the skin pass machine; based on the running distance, the second section of the strip is monitored, wherein the second section includes a strip weld section; when the monitored When the second section enters the pass finishing machine, the second preset deviation is compensated.

Preferably, after calculating the tension deviation between the actual tension on the driving side and the actual tension on the operating side, further comprising: calculating the tension on the driving side and the operating side of the strip based on the tension deviation The rate of change of the deviation; if the rate of change is continuously greater than the rate of change within the second preset time period, the light finishing machine is controlled to be turned on.

Preferably, before calculating the change rate of the tension deviation on the driving side and the operating side of the strip based on the tension deviation, the method further includes: obtaining a running distance between the strip weld and the skin pass mill; based on the running distance, monitoring a third section of the strip, wherein the third section includes a strip weld section; When it is detected that the third section enters the skin pass mill, 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 is not performed.

Preferably, the step of obtaining the running distance between the strip weld and the skin pass machine through the weld seam detection device at the entrance end of the skin pass machine and the incremental encoder includes: according to the total number of pulses of the incremental encoder , the distance between the weld seam detection device and the skin pass machine, the preset distance calculation conversion constant and the preset distance calculation correction coefficient to obtain the running distance between the strip weld and the skin pass machine, wherein the increase The total number of pulses of the quantity encoder is the total number of pulses counted since the strip weld passes through the weld detection device.

In the second aspect, the present invention provides the following technical solutions through an embodiment of the present invention:

A control device for preventing unilateral fracture of strip steel, comprising:

An acquisition module, configured to acquire the actual thickness of the driving side and the operating side of the strip being rolled in the skin pass mill, and acquire the actual tension of the driving side and the operating side of the strip at the exit of the skin pass mill;

a deviation calculation module, configured to calculate the thickness deviation between the actual thickness of the transmission side and the actual thickness of the operation side, and calculate the tension deviation between the actual tension of the transmission side and the actual tension of the operation side ;

The first control module is configured to control the opening of the skin pass machine to prevent unilateral fracture 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.

In a third aspect, the present invention provides the following technical solutions through an embodiment of the present invention:

An electronic device, comprising: a memory, a processor, and a computer program stored on the memory and operable on the processor, when the processor executes the program, the steps of any one of the methods described in the preceding first aspect are implemented .

In a fourth aspect, the present invention provides the following technical solutions through an embodiment of the present invention:

A computer-readable storage medium, on which a computer program is stored, and when the program is executed by a processor, the steps of any one of the methods described in the foregoing first aspect are implemented.

One or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages:

The control method for preventing unilateral fracture of the strip steel provided by the embodiment of the present invention obtains the actual thickness of the driving side and the operating side of the strip being rolled in the skin pass mill, and obtains the transmission side of the strip steel at the exit of the skin pass mill And the actual tension on the operating side; calculate the thickness deviation and tension deviation between the transmission side and the operating side; if the thickness deviation is greater than the first preset deviation and/or the tension deviation is greater than the second preset deviation, then control the skin finish machine to open. This method can judge defects such as unilateral folds or laminations that have occurred in the strip steel, so that the skin pass mill can automatically and quickly open the frame when the strip steel state is abnormal, stop the rolling action, and effectively prevent the area of the skin pass machine The unilateral fracture of the strip reduces the damage to the equipment and facilities caused by the broken strip accident and the processing time for subsequent restoration of production, and improves the production capacity of the unit. The method has a unified judgment standard, can track the abnormal condition of the steel strip in real time, and can realize high-standard automatic control.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings that need to be used in the description of the embodiments. Obviously, the drawings in the following description are some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained based on these drawings without creative effort.

Fig. 1 is the flow chart of the control method of the prevention strip steel unilateral fracture that the embodiment of the present invention provides;

Fig. 2 is a partial structural schematic diagram of the production line provided by the embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a control logic provided by an embodiment of the present invention;

Fig. 4 is the schematic structural view of the control device for preventing unilateral fracture of the strip steel provided by the embodiment of the present invention;

FIG. 5 is a schematic structural diagram of an electronic device provided by an embodiment of the present invention.

Reference signs:

10-pass mill; 20-strip steel; 30-strip weld; 40-weld detection device; 50-entry tension roller; 60-incremental encoder; 70-exit tension roller; 80-tension sensor; 90-lower work roll; 100-lower support roll; 110-rolling hydraulic cylinder; 120-linear sensor; 130-electromagnetic reversing valve; 140-rod chamber; 150-rodless chamber.

Detailed ways

The embodiment of the present application provides a control method, device, equipment and medium for preventing unilateral fracture of strip steel. The time machine automatically opens the frame and stops the rolling action, thus effectively preventing the unilateral fracture of the strip in the skin pass machine area.

The overall idea of the technical solution of the embodiment of the application is as follows:

A control method for preventing unilateral fracture of strip steel, comprising: obtaining the actual thickness of the driving side and the operating side of the strip steel being rolled in the skin pass mill, and obtaining the driving side and the operating side of the strip steel at the exit of the skin pass mill actual tension; calculate the thickness deviation between the actual thickness of the transmission side and the actual thickness of the operation side, and calculate the tension deviation between the actual tension of the transmission side and the actual tension of the operation side; the thickness deviation is greater than the first preset deviation, And/or the tension deviation is greater than the second preset deviation, then control the opening of the skin pass machine to prevent unilateral fracture of the strip steel.

In order to better understand the above-mentioned technical solution, the above-mentioned technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

It should be noted that the executive subject of this application may be the main controller of the entire unit, for example, it may be a PLC (programmable logic controller), hereinafter referred to as the unit PLC, and the light machine in this application includes the light machine controller. To control the opening and closing of the light machine, the following is referred to as the light machine PLC.

In the first aspect, an embodiment of the present invention provides a control method for preventing unilateral fracture of a steel strip. Specifically, as shown in FIG. 1 , the method includes the following steps S101 to S103.

Step S101, obtaining the actual thickness of the driving side and the operating side of the steel strip being rolled in the skin pass mill, and obtaining the actual tension of the driving side and the operating side of the strip at the exit of the skin pass mill;

Step S102, calculating the thickness deviation between the actual thickness of the transmission side and the actual thickness of the operation side, and calculating the tension deviation between the actual tension of the transmission side and the actual tension of the operation side;

Step S103, if the thickness deviation is greater than the first preset deviation, and/or the tension deviation is greater than the second preset deviation, then control the skin pass machine to be turned on to prevent unilateral fracture of the strip.

In the specific implementation process, as shown in Figure 2, the skin pass machine 10 provided by the present application includes the linear sensor 120 of the transmission side and the operation side rolling hydraulic cylinder, and the transmission side of the skin pass machine 10 and the operation side rolling hydraulic cylinder are used. The linear sensor 120 calculates the actual thickness of the strip steel 20 being rolled in the skin pass mill 10 on the drive side and the operating side. The actual thickness of the drive side and the operating side of the

Specifically, as shown in FIG. 2 , the skin pass mill 10 includes a lower work roll 90 and a lower support roll 100. Based on the linear sensors 120 of the rolling hydraulic cylinders on the transmission side and the operation side of the skin pass mill 10, the inner speed of the skin pass mill 10 is calculated. The actual thickness of the transmission side of the rolled steel strip 20 may include: obtaining the distance between the top of the hydraulic cylinder and the rolling line when the rolling hydraulic cylinder 110 is fully retracted, that is, when the detection value of the linear sensor 120 in the hydraulic cylinder is 0. distance; obtain the analog input value of the linear sensor 120 in the rolling hydraulic cylinder on the transmission side; measure the radius of the lower support roll of the skin pass mill and the diameter of the lower work roll of the skin pass mill.

Based on the distance between the top of the hydraulic cylinder and the rolling line, the analog input value, the preset distance calculation conversion constant, the radius of the lower back-up roll 100, and the diameter of the lower work roll 90, the rolling volume in the skin pass mill 10 is calculated. The actual thickness of the drive side of the strip 20.

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

For the transmission side:

In the formula:

Thick_DR: The actual thickness of the driving side of the strip being rolled, in mm.

L_PL: When the rolling hydraulic cylinder is fully retracted, that is, when the detection value of the linear sensor 120 in the hydraulic cylinder is 0, the distance between the top of the hydraulic cylinder and the rolling line is 1197.5mm for this unit.

R_BUR: The radius of the lower support roller used in the skin pass mill, in mm.

D_WR: The diameter of the lower work roll used in the skin pass mill, in mm.

L_DR: the analog input value of the linear sensor 120 in the transmission side rolling hydraulic cylinder during skin pass rolling.

K_L: preset distance calculation conversion constant, this unit is 0.005, the unit is 1/mm.

Likewise, for the operational side:

In the formula:

Thick_OP: The actual thickness of the operating side of the strip being rolled in the rack, in mm.

L_PL: When the rolling hydraulic cylinder is fully retracted, that is, when the detection value of the linear sensor 120 in the hydraulic cylinder is 0, the distance between the top of the hydraulic cylinder and the rolling line is 1197.5mm for this unit.

R_BUR: The radius of the lower support roller used in the skin pass mill, in mm.

D_WR: The diameter of the lower work roll used in the skin pass mill, in mm.

L_OP: the analog input value of the linear sensor 120 in the rolling hydraulic cylinder on the operating side during skin-pass rolling.

K_L: preset distance calculation conversion constant, this unit is 0.005, the unit is 1/mm.

Calculate the difference between the actual thickness of the transmission side and the actual thickness of the operation side to obtain the thickness deviation on both sides, and carry out the strip state according to the deviation of the actual thickness of the strip steel 20 being rolled in the skin pass mill 10 on the transmission side and the operation side. determination. If the thickness deviation is greater than the first preset deviation, namely:

|Thick_DR―Thick_OP|>First preset deviation

It is judged that the strip steel 20 is in poor shape, there is a serious wedge shape, or unilateral folds or laminations have occurred, and unilateral fracture is about to occur. The unit PLC sends a quick opening command to the pass machine PLC, and the pass pass machine PLC controls the pass pass machine. 10 open.

As shown in Figure 2, when the skin pass machine PLC receives the quick opening command issued by the unit PLC, it controls the electromagnetic reversing valve 130 of the rolling hydraulic cylinder on the transmission side and the operation side to operate, and the rod chamber 140 enters oil, and the rodless chamber 150 oil return, rolling hydraulic cylinder 110 withdraws rapidly, stops the rolling effect to strip steel 20, prevents further deterioration of the situation, occurs strip steel 20 unilateral fracture accidents.

If the thickness deviation is less than or equal to the first preset deviation, it means that the thickness difference between the driving side and the operating side of the strip steel 20 is small, and the skin pass machine 10 is not controlled at this time.

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

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

C1=K1×Thick_Nom

In the formula:

C1: the first preset deviation, the unit is mm.

K1: first scale factor.

Thick_Nom: Nominal thickness of strip steel, in mm.

Further, in order to avoid misjudgment and unnecessary quick-opening actions caused by normal thickness fluctuations caused by weld thickening, the actual conditions of the driving side and the operating side of the strip steel 20 being rolled in the skin pass mill 10 are acquired. Before the thickness, it also includes: through the weld detection device 40 and the incremental encoder 60 at the entrance of the skin pass machine 10, the running distance between the strip weld 30 and the skin pass machine 10 is obtained; based on the running distance, for the strip steel 20 The first section is monitored, wherein the first section includes the strip weld 30 section; when it is detected that the first section enters the skin pass machine 10, the first preset deviation is compensated.

In a specific embodiment, as shown in FIG. 2, a weld seam detection device 40 and an incremental encoder 60 are provided at the entrance of the skin pass machine, and the weld seam detection device 40 is used to detect the strip steel weld seam 30. The incremental encoder 60 in this application The quantity encoder 60 is an incremental encoder 60 arranged on the entrance tension roller 50 , and the incremental encoder 60 can obtain the running length of the strip 20 by detecting the running speed of the strip 20 .

Specifically, the running distance between the strip weld 30 and the skin pass machine 10 is acquired through the weld detection device 40 at the entrance end of the skin pass machine and the incremental encoder 60, which may include: according to the total number of pulses of the incremental encoder 60 , the distance between the weld seam detection device 40 and the skin pass machine 10, the preset conversion constant and the preset correction coefficient to obtain the running distance between the strip weld 30 and the skin pass machine 10, wherein the incremental encoder 60 The total number of pulses is the total number of pulses counted since the steel weld 30 passes through the weld detection device 40 .

Specifically, with the skin pass machine 10 as a reference point (coordinate zero point), the skin pass machine entrance side is negative, and the exit side is positive to obtain the position of the strip weld 30 relative to the skin pass machine 10, for example, the strip The position of the weld 30 is calculated according to the following formula:

In the formula:

Pos_WS: The position of the strip weld relative to the skin pass machine, in m.

I_WS: The total number of encoder pulses counted when the self-contained steel weld passes through the weld detection device.

K_I: preset distance calculation conversion constant, the unit is 4096, and the unit is 1/m.

Corr: The preset distance calculation correction coefficient, the value range is 0.98-1.02, and the unit is 1.01.

D_WS_SPM: The distance between the installation point of the welding seam detection device and the skin pass machine, this unit is 118m.

Based on the running distance (the position of the strip weld 30 relative to the skin pass machine 10 ), the first section of the strip 20 is monitored, wherein the first section includes the strip weld section. That is, knowing the running distance between the strip weld 30 and the skin pass machine 10 , it can be determined whether the corresponding section has entered the skin pass machine 10 .

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

In a specific embodiment, when it is detected that the first section enters the skin pass machine 10, the first preset deviation is compensated to avoid misjudgment and unnecessary errors caused by normal thickness fluctuations caused by weld thickening. The quick opening action is such that when the thickness deviation is greater than the first preset deviation after compensation, the skin pass machine 10 is controlled to be turned on. When it is detected that the first section leaves the skin-finishing machine 10, the first preset deviation is recovered, so that when the thickness deviation is greater than the first preset deviation, the skin-finishing machine 10 is controlled to be turned on.

For example, the first section is [-Am,+Bm], which means that it enters from Am before the weld and flows out from Bm behind the weld, and the total length (A+B)m passes through the belt of the skin pass machine 10 steel segment.

Specifically, the first preset deviation is compensated, and the first preset deviation is 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:

In the first section, the preferred range of the first proportional coefficient is between 1.7-1.9, for example: this unit can be 1.8;

In other sections except the first section, the preferred range of the first proportional coefficient is between 1.4-1.5, for example, the unit can be 1.45.

In order to prevent the unilateral fracture of the steel strip 20 more accurately, while obtaining the actual thickness of the transmission side and the operating side of the steel strip 20 being rolled in the skin pass mill 10, the thickness of the strip steel 20 at the exit of the skin pass mill 10 is also obtained. The actual tension on the transmission side and the operation side; calculate the tension deviation between the actual tension on the transmission side and the actual tension on the operation side; if the tension deviation is greater than the second preset deviation, then control the skin finish machine 10 to open.

In a specific embodiment, as shown in FIG. 2 , the tension sensor 80 on the transmission side of the tension roller 70 on the exit side of the skin pass machine 10 and the tension sensor 80 on the operation side are used to calculate the actual tension on the transmission side and the operation side of the strip steel 20 at the exit of the skin pass machine 10 . Tension, specifically, according to the analog input value of the tension sensor 80, the preset tension calculation conversion constant and the preset unit conversion constant, the actual tension of the drive side and the operation side of the strip 20 at the exit of the skin pass machine 10 is calculated.

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:

For the transmission side:

In the formula:

Ten_DR: The actual tension of the strip on the output drive side of the skin pass mill, in kN.

T_DR: The analog input value of the tension sensor on the drive side of the light machine exit.

K_T: tension calculation conversion constant, the unit is 40000, the unit is N.

K_U: unit conversion constant, the unit is 1000.

For the operating side:

In the formula:

Ten_OP: the actual tension of the strip steel at the exit drive side of the skin pass mill, in kN.

T_OP: The analog input value of the sensor on the transmission side of the light machine exit.

K_T: tension calculation conversion constant, the unit is 40000, the unit is N.

K_U: unit conversion constant, the unit is 1000.

The difference between the actual tension on the transmission side and the actual tension on the operation side is obtained to obtain the tension deviation on both sides, and the state of the strip is carried out according to the deviation of the actual tension on the transmission side and the operation side of the strip steel 20 being rolled in the skin pass mill 10. determination. When the deviation of the actual tension of the strip 20 at the exit of the skin pass machine 10 on the transmission side and the operating side is greater than the second preset deviation, that is:

|Ten_DR―Ten_OP|>The second preset deviation

and last for the first preset time period, it is determined that the strip steel 20 is unilaterally wrinkled or laminated, and the unit PLC sends a quick opening command to the pass machine PLC. For example: the first preset time period may be between 1 and 3 seconds, and in this application may be 2 seconds.

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

It should be noted that the size of the second preset deviation can be set according to the strength of the steel strip 20, so that the second preset deviation is proportional to the strength of the steel strip 20 being rolled, so as to be suitable for steel strips with different strengths. 20.

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

In the formula:

C2: The second preset deviation, the unit is kN.

K2_N: The second proportional coefficient corresponding to ordinary steel.

K2_L: The second proportional coefficient corresponding to high-strength steel.

Ten_SP: The set tension of the strip at the exit of the skin pass mill, the unit is kN.

Further, in order to avoid the normal tension fluctuation caused by the difference in the mechanical properties of the strip steel 20 head and tail, resulting in misjudgment and unnecessary quick-opening action, the transmission side of the strip steel 20 at the exit of the skin pass machine 10 and the operation Before the actual tension of the side, it may also include: through the weld detection device 40 and the incremental encoder 60 at the entrance of the skin pass machine, the running distance between the strip weld 30 and the skin pass machine 10 is obtained; based on the running distance, the The second section of the steel strip 20 is monitored, wherein the second section includes the weld section of the strip steel; when it is detected that the second section enters the skin pass machine 10 , the second preset deviation is compensated.

For example, the second section may be [-60m, +60m], that is, the weld section is at 0m, and the front and rear 60m of the weld section are the second section.

In a specific embodiment, when it is detected that the second section enters the skin pass machine 10, the second preset deviation is compensated to avoid the normal tension fluctuation caused by the difference in the mechanical properties of the head and tail of the strip steel 20. Misjudgment and unnecessary quick-opening actions make it possible to control the light finishing machine 10 to open when the tension deviation is greater than the compensated second preset deviation. When it is detected that the second section leaves the skin finish machine 10, the second preset deviation is recovered, so that when the tension deviation is greater than the second preset deviation, the skin finish machine 10 is controlled to open.

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

In the second section, the preferred range of the second proportional coefficient corresponding to ordinary steel is between 0.35-0.4, for example: this unit 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: This group can be 0.16.

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: this unit can be 0.28; the preferred range of the second proportional coefficient corresponding to high-strength steel is 0.1 Between -0.15, for example: this group can be 0.12.

Further, in order to prevent unilateral fracture of the strip steel more accurately, after calculating the tension deviation between the actual tension of the transmission side and the actual tension of the operation side, it may also include: based on the tension deviation, calculating the transmission side of the strip steel 20 and The rate of change of the tension deviation on the operating side; if the rate of change is greater than the preset rate of change, the light finishing machine 10 is controlled to open.

得到张力偏差的变化率，其中，Ten_DR为传动侧的实际张力，Ten_OP为操作侧的实际张力，t为时间。In a specific embodiment, based on the tension deviation, the rate of change of the tension deviation on the driving side and the operating side of the strip 20 is calculated, including:

Get the change rate of the tension deviation, where Ten_DR is the actual tension on the transmission side, Ten_OP is the actual tension on the operating side, and t is time.

like:

And if it lasts for the second preset time period, it is determined that the steel strip 20 has a tendency of unilateral wrinkling and lamination, and the unit PLC sends a quick opening command to the pass machine PLC. For example: the second preset time period may be between 1 and 2 seconds, and in this application may be 1.5 seconds.

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 greater than the preset rate of change is less than the second preset time period, the skin pass machine 10 is not controlled.

It should be noted that the preset rate of change can be set according to the strength of the steel strip 20 so as to be suitable for the steel strip 20 with different strengths.

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

In the formula:

C3: Preset rate of change, unit is kN/s.

C2_N: The default rate of change corresponding to ordinary steel, the unit is kN/s.

C3_H: The preset rate of change corresponding to high-strength steel, in kN/s.

Further, in order to avoid misjudgment and unnecessary quick-opening action caused by normal tension changes caused by adjusting the process parameter settings near the weld, based on the tension deviation, calculate the Before the rate of change of the tension deviation, it may also include: through the weld detection device 40 and the incremental encoder 60 at the entrance of the skin pass machine, the running distance between the strip weld 30 and the skin pass machine 10 is obtained; based on the running distance, The third section of the strip steel 20 is monitored, wherein the third section includes the strip weld section; when it is detected that the third section enters the skin pass machine 10, the calculation of the strip steel 20 based on the tension deviation is not performed. The steps of the rate of change of the tension deviation of the transmission side and the operation side.

For example, the third section may be [-15m, +75m], that is, the weld section is at 0m, the first 15m of the weld section and the 75m after the weld section are the third section, wherein the weld section The front of the section refers to the front of the weld segment in the traveling direction based on the traveling direction of the steel strip 20 .

In a specific embodiment, when it is detected that the third section enters the skin pass machine 10, the step of calculating the change rate 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 it is detected that the second section leaves the skin pass machine 10, the step of calculating the change rate of the tension deviation of the driving side and the operating side of the strip 20 based on the tension deviation is continued.

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

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

In Figure 3, it is further clarified that this application judges the unilateral folds or laminations that have, are, or will occur according to the actual thickness deviation, actual tension deviation, and actual tension deviation change rate on both sides of the strip, and generates The control logic of the fast opening command of the light finishing machine 10.

Specifically:

1. When the strip steel 20 has unilateral folds or laminations, control by detecting the actual thickness of the strip steel 20:

When the first section [-2.5m,+2.5m] of the strip steel 20 entered the skin pass machine 10, if the thickness deviation of the strip steel 20 was greater than the nominal thickness of the strip steel of 1.8, then the skin pass machine 10 was controlled to open; When other sections of the steel strip 20 enter the skin pass machine 10, if the thickness deviation is greater than the nominal thickness of the strip steel of 1.45, the skin pass machine 10 is controlled to open.

2. When the strip steel 20 is unilaterally wrinkled or laminated, it is controlled by detecting the actual tension of the strip steel 20:

When the second section [-60m, +60m] of the strip steel 20 enters the skin pass machine 10, for ordinary steel, if the tension deviation of the strip steel 20 is greater than the set tension of 0.36, and lasts for 2 seconds, then control The skin pass machine 10 is turned on; for high-strength 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 machine 10 is controlled to be turned on.

When other sections in the strip steel 20 enter the skin pass machine 10, for ordinary steel, if the actual tension deviation of the strip steel 20 is greater than the set tension of 0.28, and lasts for 2 seconds, then the skin pass machine 10 is controlled to open; For high-strength steel, if the actual tension deviation of the strip steel 20 is greater than the set tension of 0.12 for 2 seconds, the skin pass machine 10 is controlled to open.

3. When the steel strip 20 is about to be unilaterally wrinkled or laminated, it is controlled by detecting the change rate of the tension deviation of the strip steel 20:

When other sections except [-15m, +75m] sections in the strip steel 20 enter the skin pass machine 10, for ordinary steel, if the rate of change is greater than 7.8 and lasts for 1.5 seconds, then control the skin pass machine 10 Open; for high-strength steel, if the rate of change is greater than 12.4 and lasts for 1.5 seconds, the skin pass machine 10 is controlled to open.

In the above technical solution, the weld seam detection device 40, the incremental encoder 60, the linear sensor 120 and the electromagnetic reversing valve 130 are all commercially available products, and those skilled in the art can know their specific work according to their product manuals. The principle and application scheme will not be described here.

According to the actual thickness deviation, actual tension deviation, and actual tension deviation change rate on both sides of the strip, this application judges the unilateral folds or laminations that have occurred, are occurring, or will occur, so that the skin pass machine will automatically Quickly open the frame, stop the rolling action, effectively prevent the unilateral fracture of the strip in the skin pass mill area, and ensure the production capacity and yield of the unit. At the same time, according to the characteristics of the head and tail of the strip, the corresponding judgment rules are formulated to avoid unnecessary quick start of the skin pass machine caused by misjudgment, reduce the number of unfinished products, and ensure the yield of the unit.

In this application, the determination of the state of the strip and the execution of the quick start of the skin pass machine 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 personnel, ensuring the quality of production technology . Therefore, the present invention can be widely used in the field of production control in the pass mill area in the cold rolling industry.

To sum up, through the control method for preventing unilateral fracture of strip steel provided by the embodiment of the present invention, it is possible to judge defects such as unilateral folds or laminations in strip steel, so that skin pass mills appear in the state of strip steel. In case of abnormality, the stand is automatically opened and the rolling action is stopped, thereby effectively preventing the unilateral fracture of the strip in the pass mill area.

In the second aspect, based on the same inventive concept, this embodiment provides a control device for preventing unilateral fracture of strip steel, as shown in Figure 4, including:

An acquisition module 401, configured to acquire the actual thickness of the driving side and the operating side of the strip being rolled in the skin pass mill, and acquire the actual tension of the driving side and the operating side of the strip at the exit of the skin pass mill;

A deviation calculation module 402, configured to calculate the thickness deviation between the actual thickness of the transmission side and the actual thickness of the operation side, and calculate the tension between the actual tension of the transmission side and the actual tension of the operation side deviation;

The first control module 403 is configured to control the skin pass machine 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, so as to prevent unilateral fracture of the strip steel .

As an optional embodiment, the device also includes:

The running distance acquisition module is used to obtain the running distance between the strip weld and the skin-pass machine through the weld detection device at the entrance of the skin-pass machine and the incremental encoder;

The first section monitoring module is configured to monitor the first section of the steel strip based on the running distance, wherein the first section includes a strip weld section;

The first compensation module is configured to compensate the first preset deviation when it is detected that the first section enters the light finishing machine.

As an optional embodiment, the first control module 403 is specifically configured to: if within the first preset time period, the tension deviation is continuously greater than the second preset deviation, then control the skin finishing machine Open.

As an optional embodiment, the device also includes:

The running distance acquisition module is used to obtain the running distance between the strip weld and the skin pass machine through the weld detection device and the incremental encoder at the entrance of the skin pass machine;

A second section monitoring module, configured to monitor a second section of the steel strip based on the running distance, wherein the second section includes a strip weld section;

The second compensation module is configured to compensate the second preset deviation when it is detected that the second section enters the light finishing machine.

As an optional embodiment, the device also includes:

A rate-of-change calculation module, configured to calculate the rate of change of the tension deviation on the driving side and the operating side of the strip steel based on the tension deviation;

The third control module is used to control the light finishing machine to turn on if the change rate is continuously greater than the preset change rate within the second preset time period.

As an optional embodiment, the device also includes:

The running distance acquisition module is used to obtain the running distance between the strip weld and the skin pass machine through the weld detection device and the incremental encoder at the entrance of the skin pass machine;

A third section monitoring module, configured to monitor a third section of the steel strip based on the running distance, wherein the third section includes a strip weld section;

The fourth control module is configured to not perform the calculation of the tension deviation of the transmission side and the operation side of the strip based on the tension deviation when it is detected that the third section enters the skin pass machine. rate of change steps.

As an optional embodiment, the running distance acquiring module is specifically used for:

According to the total number of pulses of the incremental encoder, the distance between the weld seam detection device and the skin pass machine, the preset distance calculation conversion constant and the preset distance calculation correction coefficient, the distance between the strip weld seam and the skin pass machine is obtained The running distance between them, 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.

Each of the above modules may be implemented by software codes, and at this time, each of the above modules may be stored in the memory of the control device. Each of the above modules can also be realized by hardware such as an integrated circuit chip.

A control device for preventing unilateral fracture of strip steel provided by the embodiment of the present invention has the same realization principle and technical effect as the aforementioned method embodiment. Corresponding content in the foregoing method embodiments.

In the third aspect, based on the same inventive concept, this embodiment provides an electronic device 500, as shown in FIG. 5 , including: a memory 501, a processor 502, and a computer program 503 stored in the memory and operable on the processor. , when the processor 501 executes the program, the steps of the control method for preventing unilateral fracture of the steel strip described in the aforementioned first aspect are realized.

While preferred embodiments of the invention have been described, additional changes and modifications to these embodiments can be made by those skilled in the art once the basic inventive concept is appreciated. Therefore, it is intended that the appended claims be construed to cover the preferred embodiment as well as all changes and modifications which fall within the scope of the invention.

Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these modifications and variations.

Claims (10)

1. The control method for preventing the unilateral fracture of the strip steel is characterized by comprising the following steps of:

obtaining the actual thickness of the driving side and the operating side of the strip steel being rolled in the finishing machine, and obtaining the actual tension of the driving side and the operating side of the strip steel at the outlet of the finishing machine;

calculating a thickness deviation between an actual thickness of the transmission side and an actual thickness of the operation side, and calculating a tension deviation between an actual tension of the transmission side and an actual tension of the operation side;

and if the thickness deviation is larger than the first preset deviation and/or the tension deviation is larger than the second preset deviation, controlling the finishing machine to be opened so as to prevent the single-side fracture of the strip steel.

2. The method of claim 1, wherein prior to obtaining the actual thickness of the drive side and the handle side of the strip being rolled in the finishing machine, further comprises:

acquiring the running distance between a strip steel welding line and the finishing machine through a welding line detection device at the inlet end of the finishing machine and an incremental encoder;

monitoring a first section of the strip steel based on the travel distance, wherein the first section comprises a strip steel weld segment;

and when the first section is monitored to enter the finishing machine, compensating the first preset deviation.

3. The method of claim 1, wherein the finishing machine is controlled to turn on if the tension deviation continues to be greater than a second preset deviation for a first preset period of time.

4. The method of claim 1, wherein prior to obtaining the actual tension on the drive side and the operator side of the strip at the exit of the finishing machine, further comprises:

acquiring the running distance between a strip steel welding line and the finishing machine through a welding line detection device at the inlet end of the finishing machine and an incremental encoder;

monitoring a second section of the strip steel based on the travel distance, wherein the second section comprises a strip steel weld segment;

and when the second section is detected to enter the finishing machine, compensating the second preset deviation.

5. The method of claim 1, wherein after calculating the tension deviation between the actual tension on the drive side and the actual tension on the operating side, further comprising:

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;

and if the change rate is continuously larger than the preset change rate in the second preset time period, controlling the finishing machine to be turned on.

6. The method of claim 5, wherein before calculating the rate of change of the tension bias on the drive side and the operating side of the strip based on the tension bias, further comprising:

acquiring the running distance between a strip steel welding line and the finishing machine through a welding line detection device at the inlet end of the finishing machine and an incremental encoder;

monitoring a third section of the strip steel based on the travel distance, wherein the third section comprises a strip steel weld segment;

when the third section is detected to enter the finishing machine, the step of calculating the change rate of the tension deviation on the driving side and the operating side of the strip steel based on the tension deviation is not performed.

7. The method of claim 2, wherein the obtaining the travel distance between the strip weld and the finishing machine by the weld inspection device at the inlet end of the finishing machine and the incremental encoder comprises:

calculating a conversion constant and a preset distance according to the total number of pulses of the incremental encoder, the distance between the welding line detection device and the finishing machine, and the preset distance to calculate a correction coefficient, and obtaining the running distance between the strip steel welding line and the finishing machine, wherein the total number of pulses of the incremental encoder is the total number of pulses counted from the strip steel welding line passing through the welding line detection device.

8. A control device for preventing single-side breakage of strip steel, comprising:

the device comprises an acquisition module, a control module and a control module, wherein the acquisition module is used for acquiring the actual thickness of a transmission side and an operation side of the strip steel being rolled in the finishing machine and the actual tension of the transmission side and the operation side of the strip steel at an outlet of the finishing machine;

a deviation calculation module for calculating a thickness deviation between an actual thickness of the transmission side and an actual thickness of the operation side, and calculating a tension deviation between an actual tension of the transmission side and an actual tension of the operation side;

and the first control module is used for controlling the finishing machine to be opened so as to prevent the single-side fracture of the strip steel if the thickness deviation is larger than a first preset deviation and/or the tension deviation is larger than a second preset deviation.

9. An electronic device, comprising: memory, a processor and a computer program stored on the memory and executable on the processor, which processor implements the steps of the method of any one of claims 1-7 when the program is executed.

10. A computer readable storage medium, on which a computer program is stored, characterized in that the program, when being executed by a processor, implements the steps of the method according to any one of claims 1-7.

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