Methods and devices for detecting strip misalignment

Abstract

This invention discloses a method for detecting strip steel misalignment. The method involves acquiring the tension difference across a connecting port on a cold-rolled galvanizing line, where the cold-rolled galvanizing line is installed, and the connecting port is either the inlet or outlet of the cold-rolled galvanizing line. The method also involves acquiring the total tension across the connecting port and determining whether to output a warning message indicating strip steel misalignment based on the tension difference and the total tension. This invention discloses a method and apparatus for detecting strip steel misalignment, which can detect whether strip steel misalignment exists within the cold-rolled galvanizing line, reducing the probability of strip steel scraping and breakage, and improving the output and quality of the galvanizing production line.

Description

Technical Field

[0001] The embodiments in this specification relate to the field of strip rolling technology, and in particular to a method and apparatus for detecting strip deviation. Background Technology

[0002] The annealing furnace is a crucial piece of equipment in a cold-rolled galvanizing line. Since the galvanizing line is a continuous production unit, a shutdown due to a malfunction will inevitably result in a large amount of scrap. Therefore, stable operation of the line is extremely important. However, during operation, due to improper use of strip type or parameters, the strip passing through the finishing mill may sometimes deviate after experiencing high rolling force, which in severe cases can lead to strip breakage due to scraping.

[0003] In existing technologies, the strip deviation detection equipment is far from the finishing machine, and the strip deviates and breaks frequently inside the finishing machine. At the same time, the broken strip is pulled through the clamping rollers of the cleaning machine, which damages the rollers and renders them unusable. Ultimately, this causes the production line to be shut down for a long time and generates a large amount of waste. Therefore, there is an urgent need for a strip deviation detection method that can identify whether the strip inside the finishing machine has deviated. Summary of the Invention

[0004] This specification provides a method and apparatus for detecting strip misalignment, which can detect whether there is strip misalignment in the galvanizing machine, reduce the probability of strip scraping and strip breakage, and improve the output and quality of the galvanizing production line.

[0005] The first aspect of this specification provides a method for detecting strip misalignment, the method comprising:

[0006] The tension difference between the two sides of the connecting port of the finishing machine is obtained. The finishing machine is set on the cold rolling galvanizing line. The connecting port is the inlet or outlet of the finishing machine.

[0007] Obtain the total tension on both sides of the connecting port of the optical rectifier;

[0008] Based on the tension difference and the total tension, determine whether to output a warning message for strip misalignment.

[0009] Optionally, obtaining the tension difference between the two sides of the communication port of the optical finishing machine includes:

[0010] The first inlet tension on the operating side and the second inlet tension on the driving side are obtained by an inlet tension meter, wherein the inlet tension meter is installed at the inlet of the optical finishing machine;

[0011] The difference between the first inlet tension and the second inlet tension is obtained as the tension difference.

[0012] Optionally, obtaining the tension difference between the two sides of the communication port of the optical finishing machine includes:

[0013] The first outlet tension on the operating side and the second outlet tension on the driving side are obtained by an outlet tension meter, wherein the outlet tension meter is installed at the outlet of the optical finishing machine;

[0014] The difference between the first outlet tension and the second outlet tension is obtained as the tension difference.

[0015] Optionally, determining whether to output a warning message for strip misalignment based on the tension difference and the total tension includes:

[0016] Obtain the tension ratio between the tension difference and the total tension;

[0017] Based on the tension ratio, determine whether to output a warning message for the strip misalignment.

[0018] Optionally, determining whether to output a warning message for strip misalignment based on the tension ratio includes:

[0019] Determine whether the tension ratio is greater than a first set value;

[0020] If the tension ratio is greater than the first set value, then an early warning message for the strip deviation is output.

[0021] If the tension ratio is not greater than the first set value, then the output of the warning information for strip deviation is prohibited.

[0022] Optionally, after determining whether the tension ratio is greater than a first set value, the method further includes:

[0023] If the tension ratio is greater than the first set value, then it is determined whether the tension ratio is greater than the second set value, wherein the second set value is greater than the first set value;

[0024] If the tension ratio is greater than the first set value and not greater than the second set value, then an early warning message for the strip deviation is output.

[0025] Optionally, after determining whether the tension ratio is greater than a second set value, the method further includes:

[0026] If the tension ratio is greater than the second set value, a shutdown warning message for the cold-rolled galvanized line will be output.

[0027] Optionally, before outputting the warning information about the strip misalignment, the method further includes:

[0028] Determine whether the production line speed of the cold-rolled galvanized line is greater than the set speed, and determine whether the rolling force of the finishing mill is greater than the set rolling force;

[0029] If the production line speed of the cold-rolled galvanized line is greater than the set speed and the rolling force of the finishing mill is greater than the set rolling force, then an early warning message for strip deviation will be output.

[0030] A second aspect of the embodiments of this specification provides a strip misalignment detection device, the device comprising:

[0031] Tension difference acquisition unit is used to acquire the tension difference between the two sides of the connecting port of the finishing machine, the finishing machine is set on the cold rolling galvanizing line, and the connecting port is the inlet or outlet of the finishing machine.

[0032] Tension sum acquisition unit, used to acquire the total tension on both sides of the communication port of the optical rectifier;

[0033] The early warning information output unit is used to determine whether to output early warning information about strip deviation based on the tension difference and the total tension.

[0034] Optionally, the warning information output unit is used to determine whether the tension ratio is greater than a first set value; if the tension ratio is greater than the first set value, then output the warning information of the strip deviation; if the tension ratio is not greater than the first set value, then prohibit the output of the warning information of the strip deviation.

[0035] The beneficial effects of the embodiments in this specification are as follows:

[0036] Based on the above technical solution, the tension difference between the two sides of the connecting port of the finishing machine is obtained, and the finishing machine is set on the cold rolling galvanizing line; the total tension between the two sides of the connecting port of the finishing machine is obtained; based on the tension difference and the total tension, it is determined whether to output a warning message for strip deviation; thus, by obtaining the tension difference and the total tension between the two sides of the connecting port of the finishing machine, it is possible to determine whether to output a warning message for strip deviation, thereby enabling accurate judgment on whether there is strip deviation in the finishing machine, reducing the probability of strip scraping and strip breakage, and improving the output and quality of the galvanizing production line. Attached Figure Description

[0037] Figure 1 This is a flowchart of the strip misalignment detection method in the embodiments of this specification;

[0038] Figure 2 This is a diagram showing the connection structure of the inlet tension meter roller in the embodiments of this specification;

[0039] Figure 3 This is a schematic diagram of the strip misalignment detection device in the embodiments of this specification. Detailed Implementation

[0040] To better understand the above technical solutions, the technical solutions of the embodiments of this specification will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the embodiments of this specification and the specific features in the embodiments are detailed descriptions of the technical solutions of the embodiments of this specification, rather than limitations on the technical solutions of this specification. Unless otherwise specified, the embodiments of this specification and the technical features in the embodiments can be combined with each other.

[0041] Reference Figure 1 This invention illustrates a method for detecting strip misalignment, the method comprising:

[0042] S101. Obtain the tension difference between the two sides of the connecting port of the finishing machine, wherein the finishing machine is set on the cold rolling galvanizing line, and the connecting port is the inlet or outlet of the finishing machine.

[0043] S102. Obtain the total tension on both sides of the connecting port of the optical rectifier;

[0044] S103. Based on the tension difference and the total tension, determine whether to output a warning message for strip deviation.

[0045] In the embodiments described in this specification, the strip steel is first transferred to the finishing machine by tension rollers on the cold rolling galvanizing line, and then carried out in the next process by the cleaning machine. Tension gauges are installed at both the inlet and outlet of the finishing machine, which are divided into inlet tension gauges and outlet tension gauges.

[0046] In step S101, the connection port can be the inlet or outlet of the optical rectifier. When the connection port is the inlet of the optical rectifier, the first inlet tension on the operation side and the second inlet tension on the drive side can be obtained by the inlet tension meter. The inlet tension meter is set at the inlet of the optical rectifier. The difference between the first inlet tension and the second inlet tension is obtained as the tension difference value.

[0047] In the embodiments of this specification, the inlet tension meter can be a tension roller or a tension meter roller, etc. The tension meter roller is used as an example below.

[0048] Specifically, see Figure 2 The inlet tension meter roller 20 includes a first tension meter head 201 disposed on the operating side and a second tension meter head 202 disposed on the driving side. The first inlet tension on the operating side is obtained through the first tension meter head 201, and the second inlet tension on the driving side is obtained through the second tension meter head 202.

[0049] Specifically, after obtaining the first inlet tension and the second inlet tension through the inlet tension meter, the first inlet tension and the second inlet tension can be subtracted, and the difference obtained can be used as the tension difference; or the absolute value of the difference obtained can be used as the tension difference, etc.

[0050] In another embodiment, when the connection port is the outlet of the optical rectifier, a first outlet tension on the operating side and a second outlet tension on the driving side can be obtained using an outlet tension meter, wherein the outlet tension meter is installed at the outlet of the optical rectifier; the difference between the first outlet tension and the second outlet tension is obtained as the tension difference value. The outlet tension meter includes a third tension meter head installed on the operating side and a fourth tension meter head installed on the driving side. The specific installation method of the outlet tension meter can refer to the installation method of the inlet tension meter.

[0051] In the embodiments described in this specification, the outlet tension meter can be a tension roller or a tension meter roller, etc.

[0052] Specifically, after obtaining the first outlet tension and the second inlet / outlet tension through the outlet tension meter, the first outlet tension can be subtracted from the second outlet tension, and the difference obtained can be used as the tension difference; or the absolute value of the difference obtained can be used as the tension difference, etc.

[0053] Step S102 is executed after, before, or simultaneously with obtaining the tension difference value.

[0054] In step S102, the connection port can be the inlet of the optical rectifier or the outlet of the optical rectifier. When the connection port is the inlet of the optical rectifier, the first inlet tension on the operation side and the second inlet tension on the drive side can be obtained by the inlet tension meter; the sum of the first inlet tension and the second inlet tension is obtained as the total tension.

[0055] Accordingly, in another embodiment, when the connection port is the outlet of the optical complete machine, the first outlet tension on the operating side and the second outlet tension on the driving side can be obtained by the outlet tension meter; then the sum of the first outlet tension and the second outlet tension is obtained as the total tension.

[0056] If the first inlet tension and the second inlet tension have been obtained by the inlet tension meter in step S101, the first inlet tension and the second inlet tension can be added together and the sum can be taken as the total tension. Similarly, if the first outlet tension and the second outlet tension have been obtained by the outlet tension meter in step S101, the first outlet tension and the second outlet tension can be added together and the sum can be taken as the total tension.

[0057] After obtaining the sum of the tension difference and the total tension, proceed to step S103.

[0058] In step S103, the tension ratio between the tension difference and the total tension can be obtained; then, based on the tension ratio, it is determined whether to output a warning message for strip misalignment. Alternatively, the absolute difference between the tension difference and the set difference can be obtained, and the ratio between the absolute difference and the total tension can be used to determine whether to output a warning message. If it is within the set range, a warning message is output; otherwise, the output of the warning message is prohibited, and no operation is required.

[0059] Specifically, when obtaining the tension ratio, the ratio between the absolute value of the tension difference and the absolute value of the total tension can be used as the tension ratio, or the absolute value of the ratio between the tension difference and the total tension can be directly used as the tension ratio. Of course, if both the tension difference and the total tension are positive in steps S101 and S102, the ratio between the tension difference and the total tension can be directly used as the tension ratio.

[0060] Specifically, when determining whether to output a warning message for strip misalignment based on the tension ratio, it can be determined whether the tension ratio is greater than a first set value; if the tension ratio is greater than the first set value, then a warning message for strip misalignment is output; if the tension ratio is not greater than the first set value, then the output of the warning message for strip misalignment is prohibited.

[0061] In the embodiments of this specification, the first setting value can be set according to the actual situation, or it can be set manually or by the equipment itself. For example, the first setting value can be 25%, 30%, 32%, 36%, and 38%.

[0062] Thus, when the tension ratio is greater than the first set value, it is known that the difference between the tension difference and the total tension is large, resulting in a high tension difference on both sides of the strip. When the tension difference on both sides of the strip is high, the probability of the strip running off-center is also high. Therefore, by judging whether the tension ratio is greater than the first set value, it is possible to accurately determine whether the strip has run off-center. When it is judged that the strip has run off-center, an early warning message for strip running off-center is output. This enables accurate judgment of whether the strip has run off-center in the galvanizing machine, reduces the probability of strip scraping and strip breakage, and improves the output and quality of the galvanizing production line.

[0063] In another embodiment, in order to further reduce the probability of production line shutdown, after determining whether the tension ratio is greater than the first set value, if the tension ratio is greater than the first set value, it can also be determined whether the tension ratio is greater than the second set value, wherein the second set value is greater than the first set value; if the tension ratio is greater than the first set value but not greater than the second set value, then a warning message for strip deviation is output.

[0064] In the embodiments of this specification, the second setting value can be set according to the actual situation, or it can be set manually or by the equipment itself. For example, the second setting value can be a value greater than the first setting value, such as 45%, 50%, 52%, 55%, and 59%.

[0065] Specifically, after determining whether the tension ratio is greater than the second set value, if the tension ratio is greater than the second set value, a shutdown warning message for the cold-rolled galvanizing line is output. At this point, when the tension ratio is greater than the first set value, it indicates that the gap between the tension difference and the total tension has further increased, causing the tension difference between the two sides of the strip to further increase. When the tension difference between the two sides of the strip further increases, the strip deviation is more pronounced, significantly increasing the probability of strip scraping and breakage. Based on the above technical solution, by determining whether the tension ratio is greater than the second set value, it is possible to accurately determine whether the strip has experienced severe deviation. When severe deviation is detected, a shutdown warning message is output, thereby reducing the probability of strip scraping and breakage, and improving the output and quality of the galvanizing production line.

[0066] In another embodiment, before outputting the strip misalignment warning information, it can be determined whether the production line speed of the cold-rolled galvanizing line is greater than the set speed, and whether the rolling force of the finishing mill is greater than the set rolling force; if the production line speed of the cold-rolled galvanizing line is greater than the set speed and the rolling force of the finishing mill is greater than the set rolling force, then the strip misalignment warning information is output. Furthermore, before outputting the production stop warning information, if the production line speed of the cold-rolled galvanizing line is greater than the set speed and the rolling force of the finishing mill is greater than the set rolling force, then the production stop warning information is output.

[0067] The speed setting can be set according to the actual situation, or it can be set manually or by the equipment. The speed setting can be, for example, 8 m / min, 10 m / min, 12 m / min and 15 m / min. The rolling force setting can be set according to the actual situation, or it can be set manually or by the equipment. The rolling force setting can be, for example, 900 kN, 1000 kN, 1050 kN and 1200 kN.

[0068] For example, taking the inlet tension gauge roller at the entrance of the optical finishing machine as an example, the tension gauge roller detects and provides feedback from both sides separately. The first inlet tension detected by the inlet tension gauge roller is represented by A, and the second inlet tension detected by the inlet tension gauge roller is represented by B. The absolute value of the difference between the first inlet tension and the second inlet tension is represented by C, and the sum of the first inlet tension and the second inlet tension is represented by D, as detailed below:

[0069] |AB|=C

[0070] A+B=D.

[0071] After obtaining C and D, the ratio of C to D is used as the tension ratio. Taking a first set value of 0.3 and a second set value of 0.5 as an example, the following steps are performed: Is it greater than 0.3, and determine? Is it greater than 0.5?

[0072] like If the strip steel is determined to be misaligned, the production line alarm interlock is triggered as an early warning of strip steel misalignment; if If the strip steel is found to be seriously misaligned, the production line will be stopped as a warning.

[0073] And, in determining At this time, it is also necessary to determine whether the current production line operating speed is greater than the set speed of 10 m / min, and whether the current rolling force of the finishing mill is greater than the set rolling force of 1000 kN. If the current production line operating speed is greater than 10 m / min and the current rolling force is greater than 1000 kN, it is determined that the strip has deviated, triggering the production line alarm interlock; similarly, if the current production line operating speed is greater than 10 m / min and the current rolling force is greater than 1000 kN, and... If the strip steel is found to be seriously misaligned, the production line shutdown interlock will be triggered.

[0074] In practical applications, under the premise that the production line is running (production line speed greater than 10 m / min) and the finishing mill is in use (rolling force greater than 1000 KN), when the ratio of the tension deviation between the operating side and the drive side detected by the tension gauge roller at the entry of the finishing mill to the sum of the tensions on both sides is greater than 30%, or when the ratio of the tension deviation between the operating side and the drive side detected by the tension gauge roller at the exit of the finishing mill to the sum of the tensions on both sides is greater than 30%, the finishing mill screen alarm is triggered, reminding the operator to pay attention and adjust the relevant parameters in time. When the ratio of the tension deviation between the operating side and the drive side detected by the tension gauge roller at the entry of the finishing mill to the sum of the tensions on both sides is greater than 50%, or when the ratio of the tension deviation between the operating side and the drive side detected by the tension gauge roller at the exit of the finishing mill to the sum of the tensions on both sides is greater than 50%, the finishing section is stopped. At this time, the deviation can be dealt with in time according to the situation on site. Since the finishing section and the furnace area are separated by a looper, the furnace area does not stop at this time, which not only ensures the quality of the produced products, but also avoids the occurrence of scraping and stopping accidents.

[0075] When the production line operating speed is greater than 10 m / min and the total rolling force of the finishing mill is greater than 1000 kN, if the strip is detected to be misaligned (C / D > 0.3), the production line alarm interlock will be triggered; if the strip is detected to be seriously misaligned (C / D > 0.5), the finishing mill shutdown interlock will be triggered.

[0076] The beneficial effects of the embodiments in this specification are as follows:

[0077] Based on the above technical solution, the tension difference between the two sides of the connecting port of the finishing machine is obtained, and the finishing machine is set on the cold rolling galvanizing line; the total tension between the two sides of the connecting port of the finishing machine is obtained; based on the tension difference and the total tension, it is determined whether to output a warning message for strip deviation; thus, by obtaining the tension difference and the total tension between the two sides of the connecting port of the finishing machine, it is possible to determine whether to output a warning message for strip deviation, thereby enabling accurate judgment on whether there is strip deviation in the finishing machine, reducing the probability of strip scraping and strip breakage, and improving the output and quality of the galvanizing production line.

[0078] Based on the same technical concept as the methods described above, this specification also provides a strip misalignment detection device, such as... Figure 3 As shown, the device includes:

[0079] Tension difference acquisition unit 301 is used to acquire the tension difference between the two sides of the connecting port of the finishing machine, the finishing machine is set on the cold rolling galvanizing line, and the connecting port is the inlet or outlet of the finishing machine.

[0080] Tension sum acquisition unit 302 is used to acquire the total tension on both sides of the communication port of the optical assemblies;

[0081] The early warning information output unit 303 is used to determine whether to output early warning information about strip deviation based on the tension difference and the total tension.

[0082] In one optional embodiment, the tension difference acquisition unit 301 is used to acquire a first inlet tension on the operating side and a second inlet tension on the driving side through an inlet tension meter, wherein the inlet tension meter is disposed at the inlet of the optical rectifier; and the difference between the first inlet tension and the second inlet tension is acquired as the tension difference.

[0083] In one optional embodiment, the tension difference acquisition unit 301 is used to acquire a first outlet tension on the operating side and a second outlet tension on the driving side through an outlet tension meter, wherein the outlet tension meter is disposed at the outlet of the optical finishing machine; the difference between the first outlet tension and the second outlet tension is acquired as the tension difference.

[0084] In one optional implementation, the early warning information output unit 303 is used to obtain the tension ratio between the tension difference and the total tension; and to determine whether to output early warning information for the strip deviation based on the tension ratio.

[0085] In one optional implementation, the warning information output unit 303 is used to determine whether the tension ratio is greater than a first set value; if the tension ratio is greater than the first set value, then the warning information of the strip deviation is output; if the tension ratio is not greater than the first set value, then the output of the warning information of the strip deviation is prohibited.

[0086] In one optional implementation, the warning information output unit 303 is used to determine whether the tension ratio is greater than a first set value after determining whether the tension ratio is greater than a second set value if the tension ratio is greater than the first set value, wherein the second set value is greater than the first set value; and to output warning information about the strip deviation if the tension ratio is greater than the first set value but not greater than the second set value.

[0087] In one optional implementation, the warning information output unit 303 is used to output a shutdown warning message for the cold-rolled galvanized line if the tension ratio is greater than the second set value after determining whether the tension ratio is greater than the second set value.

[0088] In one optional implementation, the early warning information output unit 303 is used to determine whether the production line speed of the cold-rolled galvanizing line is greater than the set speed and whether the rolling force of the finishing mill is greater than the set rolling force before outputting the early warning information of strip deviation; if the production line speed of the cold-rolled galvanizing line is greater than the set speed and the rolling force of the finishing mill is greater than the set rolling force, then the early warning information of strip deviation is output.

[0089] Although preferred embodiments have been described in this specification, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this specification.

[0090] Obviously, those skilled in the art can make various modifications and variations to this specification without departing from its spirit and scope. Therefore, if such modifications and variations fall within the scope of the claims and their equivalents, this specification is also intended to include such modifications and variations.

Claims

1. A method for detecting strip misalignment, characterized in that, The method includes: The tension difference between the two sides of the connecting port of the finishing machine is obtained. The finishing machine is set on the cold rolling galvanizing line. The connecting port is the inlet or outlet of the finishing machine. Obtain the total tension on both sides of the connecting port of the optical rectifier; Based on the tension difference and the total tension, determine whether to output a warning message for strip misalignment, including: Obtain the tension ratio between the tension difference and the total tension; Based on the tension ratio, determine whether to output a warning message for the strip deviation; The step of determining whether to output a warning message for strip misalignment based on the tension ratio includes: Determine whether the tension ratio is greater than a first set value; If the tension ratio is greater than the first set value, then an early warning message for the strip deviation is output. If the tension ratio is not greater than the first set value, then the output of the warning information for strip deviation is prohibited.

2. The method as described in claim 1, characterized in that, The process of obtaining the tension difference value on both sides of the communication port of the optical rectifier includes: The first inlet tension on the operating side and the second inlet tension on the driving side are obtained by an inlet tension meter, wherein the inlet tension meter is installed at the inlet of the optical finishing machine; The difference between the first inlet tension and the second inlet tension is obtained as the tension difference.

3. The method as described in claim 1, characterized in that, The process of obtaining the tension difference value on both sides of the communication port of the optical rectifier includes: The first outlet tension on the operating side and the second outlet tension on the driving side are obtained by an outlet tension meter, wherein the outlet tension meter is installed at the outlet of the optical finishing machine; The difference between the first outlet tension and the second outlet tension is obtained as the tension difference.

4. The method as described in claim 1, characterized in that, After determining whether the tension ratio is greater than a first set value, the method further includes: If the tension ratio is greater than the first set value, then it is determined whether the tension ratio is greater than the second set value, wherein the second set value is greater than the first set value; If the tension ratio is greater than the first set value and not greater than the second set value, then an early warning message for the strip deviation is output.

5. The method as described in claim 4, characterized in that, After determining whether the tension ratio is greater than a second set value, the method further includes: If the tension ratio is greater than the second set value, a shutdown warning message for the cold-rolled galvanized line will be output.

6. The method as described in claim 5, characterized in that, Before outputting the warning information about the strip misalignment, the method further includes: Determine whether the production line speed of the cold-rolled galvanized line is greater than the set speed, and determine whether the rolling force of the finishing mill is greater than the set rolling force; If the production line speed of the cold-rolled galvanized line is greater than the set speed and the rolling force of the finishing mill is greater than the set rolling force, then an early warning message for strip deviation will be output.

7. A strip misalignment detection device, characterized in that, The device includes: Tension difference acquisition unit is used to acquire the tension difference between the two sides of the connecting port of the finishing machine, the finishing machine is set on the cold rolling galvanizing line, and the connecting port is the inlet or outlet of the finishing machine. Tension sum acquisition unit, used to acquire the total tension on both sides of the communication port of the optical rectifier; The early warning information output unit is used to determine whether to output early warning information about strip deviation based on the tension difference and the total tension; The early warning information output unit is used to: obtain the tension ratio between the tension difference and the total tension; and determine whether to output early warning information for the strip deviation based on the tension ratio. The warning information output unit is specifically used to determine whether the tension ratio is greater than a first set value; if the tension ratio is greater than the first set value, then the warning information of the strip deviation is output; if the tension ratio is not greater than the first set value, then the warning information of the strip deviation is prohibited from being output.

Images