Coiler spindle slip control method and control system

Abstract

The present application relates to the field of cold rolling technology, and particularly relates to a coiler spindle slip control method and a control system. The control method comprises: detecting an actual tension value of the strip steel between the last rolling mill and the coiler; when the actual tension value is greater / smaller than a set tension value, driving the coiler to decelerate / accelerate so that the actual tension value reaches the set tension value; detecting a rotating speed V of the coiler spindle and a rotating speed V1 of the rolling mill in the last rolling mill; calculating a ratio N of V and V1, when N is greater than or equal to a certain value and lasts for a period of time, reducing the production line speed or stopping the production line, wherein N>1. The coiler spindle slip control method and the control system provided by the present application can drive the coiler to accelerate when the strip steel slips and the tension is insufficient, so that the tension value of the strip steel returns to the set tension value, and the production line speed can be reduced or the production line can be stopped in time, which can avoid the strip steel tension from increasing sharply and the strip steel from being directly pulled off.

Description

Technical Field

[0001] This invention relates to the field of cold rolling technology, and in particular to a method and control system for controlling slippage of the mandrel in a coiler. Background Technology

[0002] In the production of cold-rolled strip steel, continuous strip steel is coiled at the end of the production line for easy storage and transportation. Coiling is a step in the production of cold-rolled strip steel, after which it is transported to continuous annealing production lines, continuous hot-dip galvanizing production lines, etc. During the coiling process, slippage can occur between the strip steel and the coiler mandrel under the following circumstances. When the strip steel slips, it will accumulate, affecting production. Summary of the Invention

[0003] This application provides a method and control system for controlling the slippage of the core shaft of a coiler, which solves the technical problem in related technologies that when the strip slips, the strip will accumulate together, affecting production.

[0004] This application provides a method for controlling mandrel slippage in a coiler. The method is applied to a cold-rolled strip steel production line, which includes a cold rolling mill and a coiler arranged sequentially. Strip steel enters the coiler from the cold rolling mill. The cold rolling mill includes multiple mills arranged side-by-side, with the mill closest to the coiler being the last mill. The method includes:

[0005] Measure the actual tension value of the strip between the last rolling mill and the coiler;

[0006] When the actual tension value is greater than or less than the set tension value, the winding machine is driven to decelerate or accelerate so that the actual tension value reaches the set tension value.

[0007] The rotational speed V of the coiler mandrel and the rotational speed V1 of the inner roll of the last rolling mill are detected.

[0008] Calculate the ratio N of V and V1. When N is greater than or equal to a certain value and persists for a period of time, reduce the speed of the production line or stop the production line, where N > 1.

[0009] In some implementations, calculating the ratio N of V and V1, and reducing or stopping the production line speed when N is greater than or equal to a certain value and remains so for a period of time, specifically includes:

[0010] Calculate the ratio N of V and V1. When N is within a first value range and lasts for a first time period, reduce the speed of the production line and issue an alarm. When N is within a second value range and lasts for a second time period, stop the production line and issue an alarm.

[0011] In some implementations, when 1.25 ≥ N ≥ 1.13 and the duration is 1-2.5 s, the production line speed is reduced; when N > 1.25 and the duration is 1-2.5 s, the production line is stopped.

[0012] In some implementations, reducing the production line speed or stopping the production line specifically includes:

[0013] Reduce the speed of the production line to 80-150 m / min.

[0014] In some embodiments, the cold-rolled strip steel production line also includes a display screen that displays the alarm message.

[0015] In some embodiments, the cold-rolled strip production line further includes a tension meter for detecting the actual tension value of the strip between the final mill and the coiler.

[0016] In some embodiments, both the final mill and the coiler are equipped with encoders, which are used to detect the rotational speed V of the coiler mandrel and the rotational speed V1 of the inner rolls of the final mill.

[0017] This application also provides a winding machine mandrel slippage control system, the control system being applied to the control method described above, the control system comprising:

[0018] Detection module: used to detect the actual tension value of the strip between the last rolling mill and the coiler, as well as the rotation speed of the coiler mandrel and the rotation speed of the inner rolls of the last rolling mill;

[0019] Judgment module: used to determine whether the actual tension value is greater than / less than the set tension value;

[0020] Calculation module: used to calculate the ratio N of the rotational speed V of the coiler mandrel and the rotational speed V1 of the inner roll of the last rolling mill;

[0021] Execution module: Used to reduce the speed of the production line or stop the production line when N is greater than or equal to a certain value and continues for a period of time.

[0022] This application also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and running on it, wherein the processor executes the program to implement the steps of the method described above.

[0023] This application also provides a computer-readable storage medium having a computer program stored thereon that, when executed by a processor, implements the steps of the method described above.

[0024] The beneficial effects of this application are as follows:

[0025] This application provides a method and control system for controlling strip slippage of a coiler mandrel. By real-time monitoring of the actual tension value of the strip between the last rolling mill and the coiler, when the actual tension value is greater than or less than the set tension value, the coiler is driven to decelerate / accelerate to bring the actual tension value to the set tension value. Therefore, when the strip slips and the tension is insufficient, the coiler is driven to accelerate to restore the strip tension value to the set tension value. Since various situations can cause the actual tension value of the strip to be greater than or less than the set tension value, this application also monitors the rotational speed V of the coiler mandrel and the rotational speed V1 of the inner rolls of the last rolling mill in real time, and calculates the ratio N of V and V1. When N is greater than or equal to a certain value and persists for a period of time, it is determined that the coiler acceleration is caused by strip slippage. At this time, reducing the production line speed or stopping the production line can, to a certain extent, prevent a drastic increase in strip tension that could directly break the strip and cause a serious accident. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention.

[0027] Figure 1 This is a schematic diagram of the cold-rolled strip steel production line provided in this embodiment;

[0028] Explanation of reference numerals in the attached figures:

[0029] 100 - Cold continuous rolling mill, 110 - Last rolling mill, 200 - Coiler, 210 - Coiler mandrel, 300 - Strip steel. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0031] It should be noted that all directional indications in the embodiments of the present invention are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0032] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0033] Furthermore, in this invention, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.

[0034] Combination Figure 1 This application provides a method for controlling the slippage of the mandrel in a coiler. This method is applied to a cold-rolled strip steel production line 300, which includes a cold rolling mill 100 and a coiler 200 arranged sequentially. The strip steel 300 enters the coiler 200 from the cold rolling mill 100. The cold rolling mill 100 includes multiple mills arranged side-by-side, with the mill closest to the coiler 200 being the last mill 110. The method includes:

[0035] S1: Detect the actual tension value of the strip 300 between the last rolling mill 110 and the coiler 200;

[0036] The cold-rolled strip 300 production line also includes a tension meter, which can be used to detect the actual tension value of the strip 300 between the last mill 110 and the coiler 200.

[0037] S2: When the actual tension value is greater than / less than the set tension value, drive the winding machine 200 to decelerate / accelerate so that the actual tension value reaches the set tension value;

[0038] The strip 300 has a preset tension value. When the strip 300 is at the preset tension value, it can operate smoothly. However, under special circumstances, the tension of the strip 300 may fluctuate, for example:

[0039] 1) During the process of increasing or decreasing the speed of the strip at 300, the actual tension value may be greater or less than the set tension value.

[0040] 2) After the 300 strip steel is produced, it needs to be cut, at which point it is in a tension-free state;

[0041] 3) At the end of the service life of the 200 sector plate of the coiler, due to wear, reduced surface roughness, production of low roughness strip steel 300 products (e.g., Ra 0.5 or below), or poor roundness of the sleeve, the strip steel 300 may slip, and the actual tension value of the strip steel 300 will be smaller than the set tension value.

[0042] Under normal circumstances, the rotational speed of the coiler mandrel 210 is greater than the rotational speed of the rolls inside the last mill 110. As a result, the strip 300 will be stretched and tensioned as it enters the coiler 200 from the last mill 110. Therefore, when it is necessary to adjust the tension value of the strip 300, it can be adjusted by adjusting the speed of the coiler 200. That is, when the actual tension value of the strip 300 is less than the set tension value, the speed of the coiler 200 is increased to increase the tension of the strip 300; when the actual tension value of the strip 300 is greater than the set tension value, the speed of the coiler 200 is decreased to decrease the tension of the strip 300, so that the actual tension value of the strip 300 reaches the set tension value.

[0043] S3: Detect the rotational speed V of the coiler core shaft 210 and the rotational speed V1 of the inner rolls of the last rolling mill 110;

[0044] As mentioned above, there are at least three situations that can cause the coiler core shaft 210 to accelerate. Among them, when the strip 300 slips, the tension of the strip 300 will increase dramatically after the coiler core shaft 210 speeds up, which may cause the strip 300 to break and result in a serious accident. Therefore, this embodiment of the application also needs to detect the rotational speed V of the coiler core shaft 210 and the rotational speed V1 of the rolls in the last mill 110 to judge the slippage situation and take corresponding measures to avoid the above situation from occurring.

[0045] S4: Calculate the ratio N of V and V1. When N is greater than or equal to a certain value and persists for a period of time, reduce the speed of the production line or stop the production line, where N > 1.

[0046] When N is greater than or equal to a certain value and persists for a period of time, it indicates that the acceleration of the winding core shaft 210 is caused by the slippage of the strip 300. In order to avoid the strip 300 breaking, the production line speed needs to be reduced or the production line needs to be stopped.

[0047] In some implementations, the ratio N of V to V1 is calculated. When N is greater than or equal to a certain value and remains so for a period of time, the production line speed is reduced or the production line is stopped. Specifically, this includes:

[0048] Calculate the ratio N of V and V1. When N is within a first value range and lasts for a first time period, reduce the production line speed and issue an alarm. When N is within a second value range and lasts for a second time period, stop the production line and issue an alarm.

[0049] When N is within the first numerical range and persists for the first time period, it indicates that the acceleration of the winding machine core shaft 210 is moderate. Simply reducing the production line speed will allow the strip 300 to return to normal after sliding a certain distance. However, when N is within the second numerical range and persists for the second time period, it indicates that the acceleration of the winding machine core shaft 210 is very high, posing a high risk of strip breakage. Therefore, the production line must be stopped, and an alarm should be issued in both cases to alert the operators. Specifically, when 1.25 ≥ N ≥ 1.13 and lasts for 1-2.5 seconds, the production line speed should be reduced to 80-150 m / min; when N > 1.25 and lasts for 1-2.5 seconds, the production line should be stopped.

[0050] In some embodiments, the cold-rolled strip steel production line 300 also includes a display screen, a tension meter, and an encoder. The display screen is used to display alarm prompts, the tension meter is used to detect the actual tension value of the strip steel 300 between the final mill 110 and the coiler 200, and encoders are installed on both the final mill 110 and the coiler 200 to detect the rotational speed V of the coiler mandrel 210 and the rotational speed V1 of the inner rolls of the final mill 110. Of course, the cold-rolled strip steel production line 300 also includes a controller, and the display screen, tension meter, and encoder are all connected to the controller. The coiler mandrel 210 is driven by a motor, which is also connected to the controller.

[0051] Based on the same inventive concept, this application also provides a control system applied to the control method described above, the control system comprising:

[0052] Detection module: used to detect the actual tension value of the strip 300 between the last rolling mill 110 and the coiler 200, as well as the rotation speed of the coiler mandrel 210 and the rotation speed of the inner rolls of the last rolling mill 110.

[0053] Judgment module: Used to determine whether the actual tension value is greater than or less than the set tension value;

[0054] Calculation module: used to calculate the ratio N of the rotational speed V of the coiler mandrel 210 and the rotational speed V1 of the inner roll of the last mill 110;

[0055] Execution module: Used to reduce the speed of the production line or stop the production line when N is greater than or equal to a certain value and continues for a period of time.

[0056] Based on the same inventive concept, this application also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and running on it, wherein the processor executes the program to implement the steps of the method described above.

[0057] Based on the same inventive concept, embodiments of this application also provide a computer-readable storage medium, characterized in that it stores a computer program thereon, which, when executed by a processor, implements the steps of the method described above.

[0058] This application provides a method and control system for controlling the slippage of the mandrel in a coiler. By real-time monitoring of the actual tension value of the strip 300 between the last mill 110 and the coiler 200, the coiler 200 is driven to decelerate / accelerate when the actual tension value is greater than / less than a set tension value, so that the actual tension value reaches the set tension value. Therefore, when the strip 300 slips and the tension is insufficient, the coiler 200 is driven to accelerate, so that the tension value of the strip 300 is restored to the set tension value. Since various situations can cause the actual tension value of the strip 300 to slip, the control system is designed to prevent slippage. When the tension value is greater than or less than the set tension value, this application also detects the rotation speed V of the coiler core shaft 210 and the rotation speed V1 of the inner roll of the last rolling mill 110 in real time, and calculates the ratio N of V and V1. When N is greater than or equal to a certain value and lasts for a period of time, it is determined that the acceleration of the coiler 200 is caused by the slippage of the strip 300. At this time, reducing the production line speed or stopping the production line can, to a certain extent, avoid the strip 300 tension from increasing drastically and directly breaking the strip 300, causing a more serious accident.

[0059] Although preferred embodiments of the invention have been described, 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 both the preferred embodiments and all changes and modifications falling within the scope of the invention.

[0060] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A method for controlling slippage of a winding machine spindle, characterized in that, The method is applied to a cold-rolled strip steel production line, which includes a cold rolling mill and a coiler arranged sequentially. The strip steel enters the coiler from the cold rolling mill. The cold rolling mill includes multiple mills arranged side by side, with the mill closest to the coiler being the last mill. The method includes: The actual tension value of the strip between the last rolling mill and the coiler is detected. When the actual tension value is greater than or less than the set tension value, the winding machine is driven to decelerate or accelerate so that the actual tension value reaches the set tension value. The rotational speed V of the coiler mandrel and the rotational speed V1 of the inner roll of the last rolling mill are detected. Calculate the ratio N of V and V1. When 1.25 ≥ N ≥ 1.13 and the duration is 1-2.5s, reduce the speed of the production line to 80-150m / min and issue an alarm. When N > 1.25 and the duration is 1-2.5s, stop the production line and issue an alarm. Where N > 1.

2. The method for controlling slippage of the winding machine mandrel as described in claim 1, characterized in that, The cold-rolled strip steel production line also includes a display screen, on which the alarm prompts are displayed.

3. The method for controlling slippage of the winding machine mandrel as described in claim 1, characterized in that, The cold-rolled strip steel production line also includes a tension meter, which is used to detect the actual tension value of the strip steel between the last rolling mill and the coiler.

4. The method for controlling slippage of the winding machine mandrel as described in claim 1, characterized in that, Both the final mill and the coiler are equipped with encoders, which are used to detect the rotational speed V of the coiler mandrel and the rotational speed V1 of the inner rolls of the final mill.

5. A winding machine core shaft slippage control system, characterized in that, The control system is applied to the control method as described in any one of claims 1-4, and the control system includes: Detection module: used to detect the actual tension value of the strip between the last rolling mill and the coiler, as well as the rotation speed of the coiler mandrel and the rotation speed of the inner rolls of the last rolling mill; Judgment module: used to determine whether the actual tension value is greater than / less than the set tension value; Calculation module: used to calculate the ratio N of the rotational speed V of the coiler mandrel and the rotational speed V1 of the inner roll of the last rolling mill; Execution module: Used to reduce the speed of the production line or stop the production line when N is greater than or equal to a certain value and continues for a period of time.

6. An electronic device, characterized in that, It includes a memory, a processor, and a computer program stored in the memory and running on the memory, wherein the processor executes the program to implement the steps of the method according to any one of claims 1-4.

7. A computer-readable storage medium, characterized in that, It stores a computer program that, when executed by a processor, implements the steps of the method described in any one of claims 1-4.

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