Method for automatically evaluating steel biting signal reliability of pinch roll

Abstract

The invention relates to the technical field of hot rolling strip steel production, in particular to a method for automatically evaluating pinch roll steel biting signal reliability, which comprises the following steps of: obtaining a pressure fluctuation range of a pinch roll in a no-load state through pressure feedback of the pinch roll in a pre-production period when the pinch roll descends in place; setting a threshold range according to the pressure fluctuation range in the no-load state and the statistical result of the impact force of the low-impact-pressure strip steel variety; setting two early warning levels of low-level alarm and high-level alarm according to the threshold range; and the pinch roll system is analyzed and processed according to the early warning level, and the running state is adjusted. The reliability of the pinch roll steel biting signal is evaluated mainly by judging whether the actual impact pressure is within the low-level alarm range and the high-level alarm range or not, the detection stability of a pinch roll steel biting signal evaluation system is improved, the head tracking distance and follow-up equipment action accuracy are ensured, the steel clamping risk and the number of waste products are reduced, and the production efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of hot-rolled strip steel production technology, and in particular to a method for automatically evaluating the reliability of pinch roll bite signals. Background Technology

[0002] In the hot-rolled strip steel production process, when the strip head exits the finishing mill and reaches 90 meters before the coiler on the laminar flow roller table, the clamping roller of the coiler samples its own pressure. Using this pressure as a benchmark, a pressure threshold is set. When the strip head impacts the clamping roller and causes a significant pressure change exceeding this threshold, it is determined that the clamping roller is biting the strip. The coiler then begins to track the strip head's forward distance. Subsequent hydraulic guide plate lifting, auxiliary coiling roller jumping, and drum expansion and contraction actions are all controlled based on this head tracking distance result. When the clamping roller is heavily worn, the roll gap widens, or the accuracy of the hydraulic cylinder or servo valve decreases, the impact pressure generated by the strip head on the clamping roller decreases. For softer and thinner strips, the impact pressure may fall below the threshold, and the clamping roller biting signal may not be triggered normally. In this case, subsequent hydraulic guide plate lifting, auxiliary coiling roller jumping, and drum expansion and contraction actions will all be incorrect, ultimately leading to strip coiling failure and jamming, generating a lot of scrap. The processing of scrap steel also affects production efficiency.

[0003] Therefore, there is a need to provide a method to evaluate whether the pinch roll biting signal can be triggered normally, so as to improve the reliability of the device operation. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a method for automatically evaluating the reliability of pinch roll bite signals. The invention primarily evaluates the reliability of pinch roll bite signals by determining whether the actual impact pressure falls within the low-level and high-level alarm range. This improves the detection stability of the pinch roll bite signal evaluation system, ensures accurate head tracking distance and subsequent equipment actions, reduces the risk of stuck steel and the amount of scrap, and increases production efficiency.

[0005] The technical means employed in this invention are as follows:

[0006] A method for automatically evaluating the reliability of the pinch roll biting signal includes: obtaining the pressure fluctuation range under no-load conditions through pressure feedback during the pre-production period when the pinch roll descends to its position; setting a threshold range based on the pressure fluctuation range under no-load conditions and the statistical results of the impact force of low-impact pressure strip steel products; setting two warning levels, low-level alarm and high-level alarm, based on the threshold range; and analyzing and processing the pinch roll system according to the warning levels to adjust its operating status.

[0007] Furthermore, setting the threshold range specifically includes: representing the pressure fluctuation range under no-load conditions as... , the threshold range Set to:

[0008] in, This indicates the pressure value added to the pressure fluctuation range under no-load conditions.

[0009] Furthermore, the upper limit of the aforementioned low-level alarms is... Represented as:

[0010] in, This indicates the upper limit of the low-level alarm.

[0011] Furthermore, the upper limit of the aforementioned high-level alarms is increased. Represented as:

[0012] in, Additional value indicating the upper limit of a high-level alert.

[0013] Furthermore, the analysis and processing of the pinch roller system based on the early warning level, and the adjustment of its operating status, specifically includes: when the magnitude of the actual impact pressure F is within... When the condition is within the specified range, the warning level is a low-level alarm, and a minor fault indication is displayed on the alarm screen of the control system. The pinch roll biting signal evaluation system requires the pinch roll to be recalibrated within the next stop time to eliminate the roll gap deviation caused by wear, and at the same time check the operating status of the hydraulic cylinder and servo valve.

[0014] Furthermore, when the magnitude of the actual impact pressure F is within When the signal is within the specified range, the warning level is a high-level alarm. A serious fault is indicated on the alarm screen of the control system. The pinch roll biting signal evaluation system requires the current coiler to be stopped immediately. The pinch roll is to be recalibrated during the next shutdown time to eliminate the roll gap deviation caused by wear. At the same time, the operating status of the hydraulic cylinder and servo valve is checked.

[0015] Compared with the prior art, the present invention has the following advantages: This invention provides a method for automatically evaluating the reliability of pinch roll bite signals. It confirms the pressure fluctuation range at the sampling time by analyzing the pinch roll's movements at different time periods, and sets threshold judgment conditions based on no-load pressure fluctuations and low-impact pressure strip steel varieties. It designs two early warning stages: low-level alarm and high-level alarm, and analyzes and processes the pinch roll system according to the alarm level to adjust the coiler's operating status. Through research and improvement on the reliability of pinch roll bite signals, this invention can detect and handle defects in advance, increase signal detection reliability, ensure correct operation of related equipment, reduce the risk of steel jamming and the amount of scrap, and improve production efficiency. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a flowchart of the method for automatically evaluating the reliability of the pinch roll bite signal in this invention. Detailed Implementation

[0018] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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 some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0021] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0022] like Figure 1 As shown, the present invention provides a method for automatically evaluating the reliability of the pinch roll biting signal, including: obtaining the pressure fluctuation range under no-load conditions by pressure feedback during the pre-production period when the pinch roll descends to the position.

[0023] A threshold range is set based on the pressure fluctuation range under no-load conditions and the statistical results of the impact force of low-impact pressure strip steel varieties; in specific implementation, as a preferred embodiment of the present invention, the pressure fluctuation range under no-load conditions is expressed as... , threshold range Set to:

[0024] in, This indicates the pressure value added to the pressure fluctuation range under no-load conditions.

[0025] Two warning levels, low-level alarm and high-level alarm, are set according to the threshold range; in specific implementation, as a preferred embodiment of the present invention, the upper limit of the low-level alarm is set as follows: Represented as:

[0026] in, This indicates the upper limit of the low-level alarm.

[0027] In specific implementation, as a preferred embodiment of the present invention, the upper limit of the high-level alarm is set... Represented as:

[0028] in, Additional value indicating the upper limit of a high-level alert.

[0029] The pinch roller system is analyzed and processed according to the warning level, and its operating status is adjusted. Specifically, in a preferred embodiment of this invention, when the actual impact pressure F is within a certain range... When the signal is within the specified range, the warning level is a low-level alarm. A minor fault indication is displayed on the alarm screen of the control system. The pinch roll biting signal evaluation system requires the pinch roll to be recalibrated within the next stop time to eliminate the roll gap deviation caused by wear. At the same time, the operating status of the hydraulic cylinder and servo valve is checked.

[0030] In specific implementation, as a preferred embodiment of the present invention, when the magnitude of the actual impact pressure F is within... When the fault is within the specified range, the warning level is a high-level alarm. A serious fault prompt is displayed on the alarm screen of the control system. The pinch roll biting steel signal evaluation system requires the current coiler to be stopped immediately. The pinch roll is to be recalibrated during the next shutdown time to eliminate the roll gap deviation caused by wear. At the same time, the operating status of the hydraulic cylinder and servo valve is checked.

[0031] Example In implementation, this invention obtains the pressure fluctuation range under no-load conditions by using pressure feedback during the pre-production period when the pinch rollers descend into position. 1KN 3KN, with different values ​​selected depending on the type of strip steel.

[0032] Based on the range of no-load pressure fluctuation Statistical results of impact force of low impact pressure strip steel (27KN) (33KN) Set threshold judgment conditions. Within the threshold range During the calculation process, The value range is 10 15KN.

[0033]

[0034] Different values ​​are selected based on the strip steel type and specifications, thus allowing for the calculation of different thresholds for different strip steel types and specifications. When the strip steel specification is 1200... At 2.3, Set to 10KN, when the strip steel specification is 1500 12 o'clock, Set to 12KN, when the strip gauge is 1850 When the thickness is 22mm, Set to 15KN. The threshold range calculated using the above formula is 11KN. 18KN. The design includes two warning stages: a low-level alarm and a high-level alarm. In the high-level alarm... The value range is 3 5KN, low-level alarm The value range is 8 10KN.

[0035]

[0036]

[0037] and Depending on the type of strip steel, different values ​​are selected, resulting in different trigger ranges for high-level and low-level alarms. The upper limit for the high-level alarm calculated using the above formula is 14 kN. 23KN, the upper limit of the low-level alarm is 19KN. 28KN.

[0038] The pinch roller system is analyzed and processed according to the alarm level. When the actual impact pressure F is within... When the signal is within the specified range, the warning level is a low-level alarm. The actions taken by the pinch roll system at this time include: displaying a minor fault notification on the control system alarm screen; and requiring the pinch roll biting signal evaluation system to respond at the next stop time (within 4 hours). Every 10 hours, the pinch rolls need to be recalibrated to eliminate roll gap deviations caused by wear, and the operating status of the hydraulic cylinders and servo valves should be checked.

[0039] When the magnitude of the actual impact pressure F is within When the signal is within the specified range, the warning level is a high-level alarm. At this time, the operation of the pinch roll system includes: displaying a serious fault prompt on the control system alarm screen; requiring the pinch roll steel biting signal evaluation system to immediately stop the coiler; recalibrating the pinch roll at the next stop time to eliminate the roll gap deviation caused by wear; and checking the operating status of the hydraulic cylinder and servo valve.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for automatically evaluating the reliability of pinch roll bite signals, characterized in that, include: By using the pressure feedback during the pre-production period when the pinch rollers descend into position, the pressure fluctuation range under no-load conditions can be obtained. The threshold range is set based on the pressure fluctuation range under no-load conditions and the statistical results of the impact force of low-impact pressure strip steel products. Two warning levels, low-level alarm and high-level alarm, are set according to the threshold range; The pinch roller system is analyzed and processed according to the warning level, and its operating status is adjusted.

2. The method for automatically evaluating the reliability of the pinch roll bite signal according to claim 1, characterized in that, The setting of the threshold range specifically includes: The pressure fluctuation range under no-load conditions is expressed as: , the threshold range Set to: in, This indicates the pressure value added to the pressure fluctuation range under no-load conditions.

3. The method for automatically evaluating the reliability of the pinch roll bite signal according to claim 1, characterized in that, Set the upper limit of the low-level alarm. Represented as: in, This indicates the upper limit of the low-level alarm.

4. The method for automatically evaluating the reliability of the pinch roll bite signal according to claim 1, characterized in that, Set the upper limit of the high-level alarm. Represented as: in, Additional value indicating the upper limit of a high-level alert.

5. The method for automatically evaluating the reliability of the pinch roll bite signal according to claim 1, characterized in that, The process of analyzing and processing the pinch roller system based on the early warning level and adjusting its operating status specifically includes: When the magnitude of the actual impact pressure F is within When the condition is within the specified range, the warning level is a low-level alarm, and a minor fault indication is displayed on the alarm screen of the control system. The pinch roll biting signal evaluation system requires the pinch roll to be recalibrated within the next stop time to eliminate the roll gap deviation caused by wear, and at the same time check the operating status of the hydraulic cylinder and servo valve.

6. The method for automatically evaluating the reliability of the pinch roll bite signal according to claim 5, characterized in that, When the magnitude of the actual impact pressure F is at When the signal is within the specified range, the warning level is a high-level alarm. A serious fault is indicated on the alarm screen of the control system. The pinch roll biting signal evaluation system requires the current coiler to be stopped immediately. The pinch roll is to be recalibrated during the next shutdown time to eliminate the roll gap deviation caused by wear. At the same time, the operating status of the hydraulic cylinder and servo valve is checked.

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