CN109522660B - Detection method for roll breakage of rolling mill in continuous rolling production line, storage medium and computing equipment - Google Patents
Detection method for roll breakage of rolling mill in continuous rolling production line, storage medium and computing equipment Download PDFInfo
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- CN109522660B CN109522660B CN201811398278.3A CN201811398278A CN109522660B CN 109522660 B CN109522660 B CN 109522660B CN 201811398278 A CN201811398278 A CN 201811398278A CN 109522660 B CN109522660 B CN 109522660B
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Abstract
The invention discloses a method for detecting roll breakage of a rolling mill in a continuous rolling production line, a storage medium and a computing device, wherein aiming at the rolling mill needing to detect roll breakage, the invention firstly determines the time T required by a billet to reach the next rolling mill from the rolling mill; when the steel signal of the rolling mill disappears or when the motor current of the rolling mill is smaller than a threshold value I1, recording the time t; then detecting whether a steel signal exists in the latter rolling mill after the time T + T; if yes, judging that the rolling mill is abnormal, and then judging whether the motor current of the next rolling mill exceeds a threshold value I2; if yes, judging that the roll of the rolling mill is broken. The method can accurately detect the roll breaking condition of the rolling mill in real time, effectively avoid the expansion of accidents caused by roll breaking, reduce economic loss and save maintenance time.
Description
Technical Field
The invention relates to the technical field of automatic control of a steel rolling continuous rolling production line, in particular to a detection method, a storage medium and a computing device for roll breakage of a rolling mill of a continuous rolling production line.
Background
In a steel rolling continuous rolling production line, the steel enters the side of a rolling mill from the position where a furnace outlet roller way is finished, the rolling mill on the side of the rolling mill sequentially comprises 1H, 2V and 3H, \8230and18V rolling mills from the running direction of a steel billet, wherein the 1H rolling mill is horizontally arranged, the 2V rolling mill is vertically arranged, the 3H rolling mill is horizontally arranged, and the like, and the rolling mills are vertically and horizontally alternately arranged.
In a continuous rolling production line, when a certain rolling mill breaks a roll, the rolling mill has no extrusion effect on a billet, but the next rolling mill of the rolling mill still runs normally and can still carry the billet forward, and the billet cannot be extruded to the shape required to be extruded due to the roll breakage of the rolling mill; this causes the latter rolling mill to bear the work of extruding the billet by the former rolling mill, which causes the current of the latter rolling mill to rise, and the shape of the billet from the latter rolling mill is not the required shape, which causes the shape of the billet rolled by the latter rolling mill after the latter rolling mill breaks off from the designed shape, which is too large to enter the inlet of the latter rolling mill, which causes the billet to be piled up between the latter rolling mill and the latter rolling mill, and the impact force is too large due to the rough billet, which in turn turns the latter rolling mill upside down to cause a series of accidents. For example, in a steel rolling continuous rolling production line, when a 1H rolling mill breaks, under the influence of 1H, 2V and 3H rolling mills (horizontal, vertical and horizontal), steel billets can be piled up between the 2V rolling mill and the 3H rolling mill, and the 3H rolling mill is overturned, so that accidents such as breakage of a speed reducer and a universal shaft of the 3H rolling mill, shaving of arc-shaped teeth, displacement of the speed reducer and the like are caused; even if the post personnel find the roller is broken and make a sudden stop in time, the rough rolling needs time to stop. The 3H rolling mill transmission current is originally limited to 120%, but the current does not continuously rise after reaching the limiting value and does not perform tripping operation, the 3H rolling mill transmission can report F035 tripping operation only when the field really has locked-rotor, but the 3H rolling mill is already turned over by the steel when the current reaches 120%, so that the time is late. Each treatment of the broken roll requires 4-6 hours, thus seriously affecting the normal production of the steel rolling continuous rolling production line, causing great damage to the equipment of the steel rolling continuous rolling production line and increasing the maintenance cost.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a method for detecting roll breakage of a rolling mill in a continuous rolling production line, which can accurately detect the roll breakage of the rolling mill in real time.
A second object of the present invention is to provide a storage medium.
It is a third object of the invention to provide a computing device.
The first purpose of the invention is realized by the following technical scheme: a detection method for roll breakage of a rolling mill in a continuous rolling production line comprises the following steps:
s1, aiming at a rolling mill needing to detect broken rolls, firstly, acquiring the distance between the rolling mill and the next rolling mill in a continuous rolling production line, and simultaneously acquiring the linear speed of the rolling mill; determining the time T required by the billet to pass from the rolling mill to the next rolling mill according to the distance between the rolling mill and the next rolling mill and the linear speed of the rolling mill;
s2, aiming at the rolling mill needing to detect the broken roll, detecting steel signals of the rolling mill and the next rolling mill, and detecting the motor current of the rolling mill;
when the steel signal of the rolling mill disappears or when the current of the motor of the rolling mill is smaller than a threshold value I1, recording the time t;
s3, detecting whether a steel signal exists in the next rolling mill after T + T time aiming at the rolling mill needing to detect the roll breakage; if yes, judging that the rolling mill is abnormal, and then judging whether the motor current of the next rolling mill exceeds a threshold value I2; if yes, judging that the roll of the rolling mill is broken.
Preferably, the following steps are also included: and S4, controlling the rolling mill and a plurality of adjacent rolling mills of the rolling mill to trip in a chain manner when the rolling mill is judged to be broken in the step S3 aiming at the rolling mill needing to detect the broken roll.
Preferably, for a rolling mill requiring roll breakage detection, the time T required for a billet to pass from the rolling mill to the subsequent rolling mill is:
d is the distance between the rolling mill and the next rolling mill in the continuous rolling production line, and V is the linear speed of the rolling mill; and a is a time correction value.
Further, a is 2 seconds.
Preferably, for a rolling mill needing to detect roll breakage, a steel signal is generated when the motor torque of the rolling mill is set to be greater than a1 of the rated motor torque, wherein the a1 is 10-12%; in step S2, the time t is the time when the motor current is detected to be smaller than the threshold I1;
aiming at a rolling mill needing to detect roll breakage, when the motor torque of the rolling mill is set to be greater than a2 of the rated motor torque, a steel signal is generated, and the a2 is 15-20%; in step S2, the time t is the time when the steel signal of the rolling mill is detected to disappear.
Furthermore, the threshold value I1 is set to be 10% -12% of the rated current of the motor.
Preferably, the threshold value I2 is 85% -90% of the rated current of the motor.
The second purpose of the invention is realized by the following technical scheme: a storage medium storing a program which, when executed by a processor, realizes a process of:
determining the time T required by a billet to reach a next rolling mill from the rolling mill according to the acquired distance between the rolling mill and the next rolling mill and the linear speed of the rolling mill aiming at the rolling mill needing to detect the broken roll;
aiming at a rolling mill needing to detect roll breakage, acquiring time t when a steel signal of the rolling mill disappears or when motor current of the rolling mill is detected to be smaller than a threshold value I1;
and aiming at the rolling mill needing to detect the roll breakage, judging whether the rolling mill is abnormal or not according to whether a steel signal exists in the latter rolling mill or not after the time T + T, judging that the rolling mill is abnormal or not when the steel signal exists in the latter rolling mill after the time T + T, comparing the motor current of the latter rolling mill with a threshold I2, and judging that the rolling mill is broken when the motor current of the latter rolling mill is greater than the threshold I2.
The third purpose of the invention is realized by the following technical scheme: a computing device comprising a processor and a memory for storing processor-executable programs, the processor, when executing programs stored by the memory, performing the following:
determining the time T required by a billet to reach a next rolling mill from the rolling mill according to the acquired distance between the rolling mill and the next rolling mill and the linear speed of the rolling mill aiming at the rolling mill needing to detect the broken roll;
aiming at a rolling mill needing to detect roll breakage, acquiring time t when a steel signal of the rolling mill disappears or when motor current of the rolling mill is smaller than a threshold value I1;
and aiming at the rolling mill needing to detect the roll breakage, judging whether the rolling mill is abnormal or not according to whether a steel signal exists in the latter rolling mill or not after the time T + T, judging that the rolling mill is abnormal or not when the steel signal exists in the latter rolling mill after the time T + T, comparing the motor current of the latter rolling mill with a threshold value I2, and judging that the rolling mill is broken when the motor current of the latter rolling mill is greater than the threshold value I2.
Preferably, the computing device is a PLC.
Compared with the prior art, the invention has the following advantages and effects:
(1) In the method for detecting the roll breakage of the rolling mill on the continuous rolling production line, aiming at the rolling mill needing to detect the roll breakage, firstly, the time T required by a billet to arrive at the next rolling mill from the rolling mill is determined; when the steel signal of the rolling mill disappears or the motor current of the rolling mill is smaller than a threshold value I1, recording the time t; then detecting whether a steel signal exists in the next rolling mill after the time T + T; if yes, judging that the rolling mill is abnormal, and then judging whether the motor current of the next rolling mill exceeds a threshold value I2; if yes, judging that the roll of the rolling mill is broken. It can be seen from the above that, in the invention, for a rolling mill requiring roll breakage detection, firstly, the time point when a steel signal of the rolling mill disappears or the time point when the motor current is smaller than the threshold value I1 is taken as the time starting point for judging whether the rolling mill is likely to be abnormal or not, after the time T, if a steel signal still exists in the latter rolling mill, it is indicated that a steel billet still remains in the latter rolling mill, and at this time, it is determined that the rolling mill is abnormal, and further, the invention finally determines whether the rolling mill is broken or not by judging the motor current of the latter rolling mill, so that the roll breakage of the rolling mill can be detected very accurately; and the invention can judge the roll breakage condition of the rolling mill after the roll breakage occurrence time T, thereby being capable of rapidly detecting the roll breakage condition of the rolling mill, effectively avoiding the expansion of accidents caused by roll breakage, reducing economic loss and saving maintenance time.
(2) In the method for detecting the roll breakage of the rolling mill on the continuous rolling production line, aiming at the rolling mill needing to detect the roll breakage, the time correction value a is added when the time T required by the billet to reach the next rolling mill from the rolling mill is calculated, so that the condition that the system has errors is considered, and the accuracy of roll breakage detection of the rolling mill is further improved.
(3) In the method for detecting the roll breakage of the rolling mill on the continuous rolling production line, when the rolling mill is judged to be abnormal aiming at the rolling mill needing to detect the roll breakage, whether the motor current of the next rolling mill exceeds a threshold value I2 is judged; if yes, judging that the roller of the rolling mill is broken; in the present invention, the threshold I2 is set to 90% of the rated current of the motor. In the normal production process of the continuous rolling production line, the motor current of the rolling mill runs between 50% and 70% of the rated current of the motor, the situation that the current is higher than the rated current by more than 90% cannot occur, and moreover, when the rolling mill breaks, the rolling mill actually loses the effect of extruding the billet, so that the workload (the extrusion and the load of the billet) borne by the latter rolling mill is increased, the situation that the current of the latter rolling mill rises rapidly is inevitable, the situation that the current of the latter rolling mill does not rise to a very high value instantly is considered, and if the judgment time is too long, the accident consequence is larger, the threshold I2 is set to be 85% to 90% of the rated current of the motor, the judgment time of the broken roll of the rolling mill can be shortened, the accuracy of the broken roll judgment of the rolling mill is ensured, and the expansion of the accident after the broken roll of the rolling mill is prevented as much as possible.
(4) In the method for detecting the roll breakage of the rolling mill on the continuous rolling production line, aiming at the rolling mill needing to detect the roll breakage, when the motor torque of the rolling mill is set to be greater than a1 of the rated torque of a motor, a steel signal is generated, in the step, the time t, namely the time starting point for judging whether the rolling mill is possible to be abnormal is the time when the motor current is detected to be less than a threshold value I1, wherein the a1 is 10-12%. In this case, in the present invention, a steel present signal is generated when the motor torque of the rolling mill is greater than a1 of the motor rated torque. When roll breakage occurs in the production process of the rolling mill, the motor current of the rolling mill can be greatly reduced, if the motor current is lower than a1 of the rated torque of the motor, the steel signal of the rolling mill disappears, but the situation that the motor current of the rolling mill is greatly reduced but not lower than a1 of the rated torque of the motor can also occur, and the steel signal of the rolling mill does not disappear. In the existing continuous rolling production line, a steel signal is generated when the motor torque of the rolling mill is generally set to be greater than 10% -12% of the rated torque of a motor, so that in order to adapt to the existing continuous rolling production line, the time when the motor current is smaller than a threshold value I1 is used as a time starting point for judging whether the rolling mill is possible to be abnormal or not, and the roll breakage detection can be realized under the condition that relevant parameters of the rolling mill of the existing continuous rolling production line are not changed.
(5) In the method for detecting the roll breakage of the rolling mill in the continuous rolling production line, a steel signal is generated when the motor torque of the rolling mill is set to be greater than a2 of the rated torque of a motor for the rolling mill needing to detect the roll breakage, the time t is the time starting point for judging whether the rolling mill is possible to be abnormal and is the time for detecting the disappearance of the steel signal of the rolling mill, and the a2 is 15-20%. In this case, in the present invention, the signal of presence of steel is generated when the motor torque of the rolling mill is greater than 15% of the motor rated torque, and the signal of presence of steel is extinguished when the motor torque of the rolling mill is equal to or less than a2 of the motor rated torque. When the rolling mill breaks in the production process, the motor current of the rolling mill is greatly reduced, the motor current is reduced to a2 lower than the rated torque of the motor, and the condition that the roll breaking of all rolling mills occurs is basically included.
Drawings
FIG. 1 is a flow chart of the detection method for roll breakage of the rolling mill in the continuous rolling production line.
Detailed Description
The present invention will be described in further detail with reference to examples and drawings, but the present invention is not limited thereto.
Example 1
The embodiment discloses a method for detecting roll breakage of a rolling mill in a continuous rolling production line, which comprises the following steps as shown in figure 1:
s1, aiming at a rolling mill needing to detect roll breakage, firstly, acquiring the distance between the rolling mill and the next rolling mill in a continuous rolling production line, and simultaneously acquiring the linear speed of the rolling mill; determining the time T required by the billet to pass from the rolling mill to the next rolling mill according to the distance between the rolling mill and the next rolling mill and the linear speed of the rolling mill;
for example, when roll breakage detection is carried out on a 1H rolling mill in a continuous rolling production line, firstly, the distance between the 1H rolling mill and a 2V rolling mill in the continuous rolling production line is obtained, and meanwhile, the linear velocity of the 1H rolling mill is obtained; and determining the time T required by the billet to reach the 2V rolling mill from the 1H rolling mill according to the distance between the 1H rolling mill and the 2V rolling mill and the linear speed of the 1H rolling mill.
In this embodiment, for a rolling mill requiring roll breakage detection, the time T required for a billet to pass from the rolling mill to the subsequent rolling mill is:
d is the distance between the rolling mill and the next rolling mill in the continuous rolling production line, and V is the linear speed of the rolling mill; a is a time correction value, and a can be set to be 2 seconds in the embodiment; the embodiment considers the condition that the system has errors, and improves the accuracy of the roll breakage detection of the rolling mill.
S2, aiming at a rolling mill needing to detect roll breakage, detecting steel signals of the rolling mill and the next rolling mill, and detecting the motor current of the rolling mill; for example, when roll breakage detection is performed on a 1H rolling mill in a continuous rolling production line, steel signals of the 1H rolling mill and a 2V rolling mill are detected, and the motor current of the 1H rolling mill is detected.
When the steel signal of the rolling mill disappears or when the current of the motor of the rolling mill is smaller than a threshold value I1, recording the time t; in the embodiment, the threshold I1 is set to 10% -12% of the rated current of the motor, and when the rolling mill motor current is detected to appear to be smaller than the threshold I1, the time when the rolling mill motor current is detected to appear for the first time to be smaller than the threshold I1 is referred to.
In the embodiment, for a rolling mill needing to detect roll breakage, a steel signal can be generated when the motor torque of the rolling mill is set to be greater than a1 of the rated motor torque, wherein the a1 is 10-12%; at the moment, the time t in the step is the time when the motor current is detected to be smaller than the threshold value I1;
in this embodiment, for a rolling mill requiring roll breakage detection, a steel signal may be generated when the motor torque of the rolling mill is greater than a2 of the motor rated torque, where a2 is 15% to 20%; at this time, the time t in the step is the time when the steel signal of the rolling mill disappears.
S3, detecting whether a steel signal exists in the next rolling mill after the T + T moment aiming at the rolling mill needing to detect the broken roll; if yes, judging that the rolling mill is abnormal, otherwise, judging that the rolling mill is not abnormal; then judging whether the motor current of the next rolling mill exceeds a threshold value I2; if so, judging that the roll breaking occurs in the rolling mill, otherwise, judging that the roll breaking does not occur in the rolling mill. In the present embodiment, the threshold I2 is 90% of the rated current of the motor. For example, when roll breakage detection is carried out on a 1H rolling mill in a continuous rolling production line, whether a steel signal exists in a 2V rolling mill after T + T is detected; if the current exceeds the threshold value I2, judging that the 1H rolling mill is abnormal, and then judging whether the motor current of the 2V rolling mill exceeds the threshold value I2; and if so, judging that the 1H rolling mill has roll breakage.
And S4, controlling the rolling mill and a plurality of adjacent rolling mills of the rolling mill to trip in an interlocking manner when the rolling mill is judged to be broken in the step S3 aiming at the rolling mill needing to detect the broken roll. For example, when roll breakage is detected for a 1H rolling mill in a continuous rolling line, if it is determined in step S3 that the 1H rolling mill is broken, the 1H rolling mill, the 2V rolling mill and the 3H rolling mill are controlled to trip in a chain manner.
As can be seen from the above steps, in the present embodiment, for a rolling mill requiring detection of roll breakage, first, the time T required for a billet to arrive at the next rolling mill from the rolling mill is determined; when the steel signal of the rolling mill disappears or when the motor current of the rolling mill is smaller than a threshold value I1, recording the time t; then detecting whether a steel signal exists in the latter rolling mill after the time T + T; if yes, judging that the rolling mill is abnormal, and then judging whether the motor current of the next rolling mill exceeds a threshold value I2; if yes, judging that the roll of the rolling mill is broken. As can be seen from the above description, in this embodiment, the time point when the steel signal of the rolling mill disappears or the time point when the motor current is smaller than the threshold I1 is used as the time starting point for determining whether the rolling mill is likely to be abnormal, and after the time T, if the steel signal still exists in the subsequent rolling mill, it is indicated that a steel billet still remains in the subsequent rolling mill, and at this time, it is determined that the rolling mill is abnormal, and further, in this embodiment, it is determined whether the rolling mill is broken by determining the motor current of the subsequent rolling mill, so that the rolling mill breaking condition can be detected very accurately; in addition, the roll breakage condition of the rolling mill can be judged after the roll breakage occurrence time T of the rolling mill, so that the roll breakage condition of the rolling mill can be detected quickly, the expansion of accidents caused by roll breakage is effectively avoided, the economic loss is reduced, and the maintenance time is saved. When the method of the embodiment detects the roll breakage of the rolling mill, the roll breakage processing is started, only half an hour of processing time is needed, while the previous accident processing takes 4-6 hours, so that the maintenance time of the continuous rolling production line is greatly saved, and the production efficiency of the continuous rolling production line is improved.
In the above step S2 of the present embodiment, for the rolling mill requiring roll breakage detection, the steel presence signal is generated when the motor torque of the rolling mill is greater than a1 of the motor rated torque, where a1 is 10% to 12%, and the time t, which is the time starting point for determining whether there is a possibility of abnormality of the rolling mill, is the time when the motor current is detected to be less than the threshold I1. In this case, in the present embodiment, the signal of steel presence is generated when the motor torque of the rolling mill is greater than 10% of the motor rated torque. When roll breakage occurs in the production process of the rolling mill, the motor current of the rolling mill can be greatly reduced, if the motor current is lower than a1 of the rated torque of the motor, the steel signal of the rolling mill disappears, but the situation that the motor current of the rolling mill is greatly reduced but not lower than a1 of the rated torque of the motor can also occur, and the steel signal of the rolling mill does not disappear. In the existing continuous rolling production line, a steel signal is generated when the motor torque of the rolling mill is generally set to be greater than 10% -12% of the rated motor torque, so that in order to adapt to the existing continuous rolling production line, the time when the motor current is smaller than the threshold value I1 is used as the time starting point for judging whether the rolling mill is abnormal or not, and the roll breakage can be detected under the condition that relevant parameters of the rolling mill of the existing continuous rolling production line are not changed.
In the above step S2 of the present embodiment, for the rolling mill requiring roll breakage detection, the steel presence signal may be generated when the motor torque of the rolling mill is set to be greater than a2 of the motor rated torque, where a2 is 15% to 20%; at the moment, the time t is the time starting point for judging whether the rolling mill is possible to be abnormal or not, and is the time for detecting that the steel signal of the rolling mill disappears; in this case, in the present embodiment, the signal of steel presence is generated when the motor torque of the rolling mill is greater than a2 of the motor rated torque, and disappears when the motor torque of the rolling mill is equal to or less than a2 of the motor rated torque. When roll breakage occurs in the production process of the rolling mill, the motor current of the rolling mill can be greatly reduced, the motor current is reduced to a2 lower than the rated torque of the motor, and the situation that roll breakage of all rolling mills occurs is basically included.
In step S4 of the present embodiment, the threshold I2 is set to 85 to 90% of the rated current of the motor. In the normal production process of the continuous rolling production line, the motor current of the rolling mill runs between 50% and 70% of the rated current of the motor, the situation that the current is higher than 85% of the rated current cannot occur, and moreover, when the rolling mill breaks, the rolling mill actually loses the function of extruding the billet, the workload (extrusion and load capacity of the billet) borne by the next rolling mill is increased, the situation that the current of the next rolling mill rises rapidly is inevitable, the situation that the current of the next rolling mill rises instantly to a high value is considered, if the judgment time is too long, the accident consequence is larger, the threshold value I2 is set to be 85% to 90% of the rated current of the motor, the judgment time of the broken roll of the rolling mill can be shortened, the accuracy of the broken roll judgment of the rolling mill is guaranteed, and the expansion of the accident after the broken roll of the rolling mill is prevented as far as possible.
Example 2
The present embodiment further includes a storage medium storing a program, which when executed by a processor, implements the following processes:
determining the time T required by a billet to reach a next rolling mill from the rolling mill according to the acquired distance between the rolling mill and the next rolling mill and the linear speed of the rolling mill aiming at the rolling mill needing to detect the broken roll;
aiming at a rolling mill needing to detect roll breakage, acquiring time t when a steel signal of the rolling mill disappears or when motor current of the rolling mill is smaller than a threshold value I1; in the embodiment, the threshold I1 is set to be 10% -12% of the rated current of the motor;
and aiming at the rolling mill needing to detect the roll breakage, judging whether the rolling mill is abnormal or not according to whether a steel signal exists in the latter rolling mill or not after the time T + T, judging that the rolling mill is abnormal or not when the steel signal exists in the latter rolling mill after the time T + T, comparing the motor current of the latter rolling mill with a threshold I2, and judging that the rolling mill is broken when the motor current of the latter rolling mill is greater than the threshold I2. In the present embodiment, the threshold I2 is set to 85% to 90% of the rated current of the motor.
In the embodiment, for a rolling mill requiring roll breakage detection, the time T required for a billet to pass from the rolling mill to the next rolling mill is:
d is the distance between the rolling mill and the next rolling mill in the continuous rolling production line, and V is the linear speed of the rolling mill; a is a time correction value, and a may be set to 2 seconds in this embodiment.
In this embodiment, the storage medium may be a device having a storage function, such as a ROM, a RAM, a usb-disk, and a hard disk.
Example 3
The embodiment discloses a computing device, which comprises a processor and a memory for storing executable programs of the processor, wherein when the processor executes the programs stored in the memory, the following processes are realized:
determining the time T required by a billet to reach a next rolling mill from the rolling mill according to the acquired distance between the rolling mill and the next rolling mill and the linear speed of the rolling mill aiming at the rolling mill needing to detect the broken roll;
aiming at a rolling mill needing to detect roll breakage, acquiring time t when a steel signal of the rolling mill disappears or when motor current of the rolling mill is detected to be smaller than a threshold value I1; in the embodiment, the threshold I1 is set to be 10% -12% of the rated current of the motor;
and aiming at the rolling mill needing to detect the roll breakage, judging whether the rolling mill is abnormal or not according to whether a steel signal exists in the latter rolling mill or not after the time T + T, judging that the rolling mill is abnormal or not when the steel signal exists in the latter rolling mill after the time T + T, comparing the motor current of the latter rolling mill with a threshold value I2, and judging that the rolling mill is broken when the motor current of the latter rolling mill is greater than the threshold value I2. In the present embodiment, the threshold I2 is set to 85% to 90% of the rated current of the motor.
In this embodiment, the computing device may be a PLC, and may specifically select the siemens PLC400. Of course other devices with programmable and processing functions may be used.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (10)
1. A detection method for roll breakage of a rolling mill in a continuous rolling production line is characterized by comprising the following steps:
s1, aiming at a rolling mill needing to detect roll breakage, firstly, acquiring the distance between the rolling mill needing to detect roll breakage and a subsequent rolling mill in a continuous rolling production line, and simultaneously acquiring the linear velocity of the rolling mill needing to detect roll breakage; determining the time T required by the billet to pass from the rolling mill needing to detect the broken roll to the next rolling mill according to the distance between the rolling mill needing to detect the broken roll and the next rolling mill and the linear speed of the rolling mill needing to detect the broken roll;
s2, aiming at the rolling mill needing to detect the broken roll, detecting steel signals of the rolling mill needing to detect the broken roll and a next rolling mill, and detecting the motor current of the rolling mill needing to detect the broken roll;
when the steel signal of the rolling mill needing to detect the broken roll disappears or when the current of the rolling mill motor needing to detect the broken roll is smaller than a threshold value I1, recording the time t;
s3, detecting whether a steel signal exists in the next rolling mill after T + T time aiming at the rolling mill needing to detect the roll breakage; if the current value of the motor of the rolling mill exceeds the threshold value I2, judging that the rolling mill needing to detect the roll breakage is abnormal; and if so, judging that the roll breakage occurs in the rolling mill needing to detect the roll breakage.
2. The method for detecting roll breakage of a rolling mill in a continuous rolling production line according to claim 1, further comprising the steps of: and S4, aiming at the rolling mill needing to detect the broken rolls, when the rolling mill needing to detect the broken rolls is judged to have broken rolls in the step S3, controlling the rolling mill needing to detect the broken rolls and a plurality of rolling mills adjacent to the rolling mill needing to detect the broken rolls to trip in an interlocking manner.
3. The method for detecting roll breakage of a rolling mill in a continuous rolling line according to claim 1, wherein a time T required for a billet to pass from the rolling mill requiring roll breakage detection to a subsequent rolling mill for which roll breakage detection is required is:
d is the distance between the rolling mill needing to detect the broken roll and the next rolling mill in the continuous rolling production line, and V is the linear speed of the rolling mill needing to detect the broken roll; and a is a time correction value.
4. The method for detecting roll breakage of a continuous rolling line rolling mill as set forth in claim 3, wherein a is 2 seconds.
5. The method for detecting the roll breakage of the rolling mill in the continuous rolling production line according to claim 1, wherein for the rolling mill needing to detect the roll breakage, a steel signal is generated when the motor torque of the rolling mill needing to detect the roll breakage is set to be greater than a1 of the rated motor torque, wherein the a1 is 10-12%; in step S2, the time t is the time when the motor current is detected to be smaller than the threshold I1;
aiming at a rolling mill needing to detect roll breakage, when the motor torque of the rolling mill needing to detect roll breakage is set to be larger than a2 of the motor rated torque, a steel signal is generated, and the a2 is 15% -20%; in step S2, the time t is the time when the steel signal of the rolling mill requiring the roll break detection disappears.
6. The method for detecting roll breakage of a rolling mill in a continuous rolling line according to claim 5, wherein the threshold value I1 is set to 10% to 12% of a rated current of the motor.
7. The method for detecting roll breakage of a rolling mill in a continuous rolling production line according to claim 1, wherein the threshold value I2 is 85% to 90% of a rated current of the motor.
8. A storage medium storing a program, wherein the program when executed by a processor implements the following:
aiming at a rolling mill needing to detect roll breakage, determining the time T required by a billet to reach the next rolling mill from the rolling mill needing to detect roll breakage according to the obtained distance between the rolling mill needing to detect roll breakage and the next rolling mill and the linear speed of the rolling mill needing to detect roll breakage;
aiming at a rolling mill needing to detect roll breakage, acquiring time t when a steel signal of the rolling mill needing to detect roll breakage disappears or when motor current of the rolling mill needing to detect roll breakage is smaller than a threshold value I1;
and aiming at the rolling mill needing to detect the broken roll, judging whether the rolling mill needing to detect the broken roll is abnormal or not according to whether a steel signal exists in the latter rolling mill or not after the time T + T, judging that the rolling mill needing to detect the broken roll is abnormal or not when the steel signal exists in the latter rolling mill after the time T + T, comparing the motor current of the latter rolling mill with a threshold I2, and judging that the rolling mill needing to detect the broken roll is broken when the motor current of the latter rolling mill is greater than the threshold I2.
9. A computing device comprising a processor and a memory for storing processor executable programs, characterized in that: when the processor executes the program stored in the memory, the following processes are realized:
aiming at a rolling mill needing to detect roll breakage, determining the time T required by a billet to reach the next rolling mill from the rolling mill needing to detect roll breakage according to the obtained distance between the rolling mill needing to detect roll breakage and the next rolling mill and the linear speed of the rolling mill needing to detect roll breakage;
aiming at a rolling mill needing to detect roll breakage, acquiring time t when a steel signal of the rolling mill needing to detect roll breakage disappears or when the motor current of the rolling mill needing to detect roll breakage is smaller than a threshold value I1;
and aiming at the rolling mill needing to detect the broken roll, judging whether the rolling mill needing to detect the broken roll is abnormal or not according to whether a steel signal exists in the latter rolling mill or not after the time T + T, judging that the rolling mill needing to detect the broken roll is abnormal or not when the steel signal exists in the latter rolling mill after the time T + T, comparing the motor current of the latter rolling mill with a threshold I2, and judging that the rolling mill needing to detect the broken roll is broken when the motor current of the latter rolling mill is greater than the threshold I2.
10. The computing device of claim 9, wherein the computing device is a PLC.
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