System and method for detecting side bending of single rolled plate of hot-rolled wide and thick plate

Abstract

The invention belongs to the technical field of steel plate shape analysis, and particularly discloses a hot-rolled wide and thick plate single rolled plate side bending detection system and method, and the method comprises the following steps: firstly, calling the opening degree of a front side guide plate and a rear side guide plate of a rolling mill, and setting the steel plate side bending amount; when rolling begins, an encoder on a rolling mill side guide plate detects the opening degree in real time, and a rolling mill control module obtains the rolling pass number of a steel plate, judges the rolling direction according to the pass number and calculates the opening degree change of the front and rear side guide plates at the same time; and if the difference value is greater than 15mm, the related data information is sent to the mobile phone APP. Aiming at the problems of high equipment cost and difficulty in maintenance in the current lateral bending detection technology, the invention realizes the judgment of lateral bending of the steel plate by combining the position data of the lateral guide plate with an algorithm program, and timely management and control of lateral bending by sending alarm information in real time through a mobile phone APP, thereby solving the problems of the steel plate lateral bending detection technology in the prior art. The problems that equipment cost is high, maintenance is difficult, and lateral bending detection is prone to being interfered by the environment when thin-specification super-long steel plates are produced exist in the prior art.

Description

Technical Field

[0001] This invention relates to the field of steel plate shape analysis technology, specifically to a detection system and method for side bending of hot-rolled wide and thick plates. Background Technology

[0002] In the steel rolling industry, hot-rolled heavy plates are key basic materials for major projects such as large-scale machinery manufacturing, bridge construction, and shipbuilding. Their plate quality directly determines the feasibility of subsequent processing and the safety of the final product. Among them, side bending, a common plate defect in the production process of hot-rolled heavy plates, manifests as transverse bending deformation of the steel plate along its length. This deformation not only leads to problems such as deviation and equipment impact during the rolling process, but also significantly reduces the yield rate, increases production costs, and may even cause structural failure during subsequent use due to stress concentration.

[0003] Side bending is closely related to various factors during the rolling process. From an equipment perspective, the accuracy of the mill's roll gap adjustment, the alignment deviation of the side guide plates, and the levelness error of the roller table all affect the stress balance of the steel plate, leading to side bending. From a process parameter perspective, uneven distribution of rolling temperature, unreasonable distribution of reduction per pass, and fluctuations in rolling speed can cause uneven stress and strain in the steel plate during deformation, ultimately triggering side bending. In addition, the compositional segregation and uneven microstructure of the billet itself can also lead to inconsistent deformation during rolling due to differences in material properties, exacerbating side bending. In the production of thin-gauge steel plates with a thickness of 10mm-12mm and a length of 30m-60m, the problem of side bending is more prominent due to the lower rigidity of the steel plate and the longer rolling path.

[0004] Currently, the detection technology for side bending in hot-rolled thick plates mainly relies on a combination of online shape measurement systems and manual inspection. Online shape measurement systems typically employ technologies such as laser ranging and optical imaging, using detection devices installed at the mill exit to monitor the lateral position of the steel plate in real time, thereby determining the presence of side bending. Manual inspection, on the other hand, involves workers observing the steel plate's running status during rolling and relying on experience to judge whether side bending has occurred. While this method is lower in cost, it is significantly affected by human factors, resulting in highly subjective detection results and difficulty in quantifying the amount of side bending. It often only detects side bending when it has become quite severe, thus failing to meet the requirements for real-time control. Furthermore, when rolling ultra-long steel plates of 30m-60m, manual inspection cannot cover the entire length of the plate, creating a certain detection blind spot and further reducing the reliability of side bending detection.

[0005] In summary, existing steel plate side bending detection technologies suffer from the following problems: Firstly, traditional online measurement systems are costly, difficult to maintain, and susceptible to environmental interference when inspecting thin, ultra-long steel plates. Secondly, manual inspection is inefficient and inaccurate, failing to meet the real-time detection requirements of modern rolling production lines. Furthermore, most existing technologies can only detect side bending after rolling, unable to detect it during the rolling process and provide feedback to workers, leading to delays in adjusting process parameters and causing a large number of defective products. Therefore, to address these issues, it is necessary to design a side bending detection system and method for hot-rolled wide and thick plates. This method utilizes existing pusher bed side guide plate position detection data combined with an algorithm to determine side bending, eliminating the need for additional detection equipment, effectively reducing detection costs. Simultaneously, it can send alarm information in real-time via a mobile app, enabling timely control of side bending and significantly improving the production efficiency of thin, ultra-long steel plates. Summary of the Invention

[0006] The purpose of this invention is to provide a detection system and method for side bending of hot-rolled wide and thick plates, so as to solve the problems of high equipment cost, difficult maintenance, and easy environmental interference when performing side bending detection in the production of thin and ultra-long steel plates under the existing technology.

[0007] To achieve the above objectives, the basic solution provided by this invention is as follows: a detection system for side bending of hot-rolled wide and thick plates, comprising a data processing unit, a public WeChat account, and a mobile APP management client. The data processing unit includes a data acquisition module, a calculation module, and an output module. The data acquisition module is used to retrieve relevant data from the rolling mill PLC system. The calculation module is used to calculate the difference between the actual value and the set value of the opening degree of the pusher side guide plate at the rolling mill entrance and exit. The output module is used to output the relevant data information on the side bending of the steel plate to the public WeChat account and the mobile APP management client. The public WeChat account and the mobile APP management client are used by staff to view the relevant data information on the side bending of the steel plate.

[0008] The beneficial effects of the present invention are as follows: (1) The present invention retrieves the value of the pusher side guide plate in the PLC system and monitors the displacement data of the side guide plate in real time during the rolling process. The dynamic changes of the steel plate impacting the side guide plate are analyzed in real time through program logic, thereby determining whether the steel plate has bent laterally. No new equipment is required, saving the installation and maintenance costs of new equipment. It can also accurately capture the time, pass, and tilt of the side guide plate work roll when the steel plate bends laterally; (2) When the steel plate bends laterally, relevant information can be sent to the staff's mobile phones through the official account and mobile APP management client to remind the staff. This enables staff to adjust rolling parameters in a timely manner based on relevant information, prevents further deterioration of side bending, and provides a basis for process optimization, which can reduce the frequency of side bending in subsequent production processes; (3) By embedding a code program in the data processing unit, the changes of the pusher side guide plate are monitored and calculated in real time, thereby determining whether the steel plate has side bending. At the same time, the relevant information of the steel plate side bending is sent to the staff's mobile phone, which effectively reduces the number of times the steel plate hits the pusher side guide plate, avoids damage to the equipment, realizes the stable production of thin-specification ultra-long steel plates, and improves the production efficiency of thin-specification steel plates.

[0009] Option 2, a method for detecting the side bending of a single-rolled hot-rolled wide and thick plate, characterized by comprising the following steps: S1: First, the acquisition module retrieves the opening degree setting value of the pusher side guide plate at the mill inlet and the opening degree setting value of the pusher side guide plate at the mill outlet from the PLC system, and at the same time sets the value of the steel plate side bending amount in the calculation module. S2: When the steel plate enters the rolling mill to start rolling, the encoder on the pusher side guide plate at the mill entrance detects the actual value of the opening degree of the pusher side guide plate at the mill entrance in real time and transmits the data to the PLC system. When the steel plate finishes rolling and leaves the mill exit, the encoder on the pusher side guide plate at the exit detects the actual value of the opening degree of the pusher side guide plate at the mill exit in real time and transmits the data to the PLC system. At the same time, the acquisition module retrieves the number of rolling passes of the steel plate and the opening degree setting value of the pusher side guide plate at the mill entrance and mill exit from the PLC system. S3: Then the calculation module determines the rolling direction based on the number of rolling passes. Then the calculation module calculates the difference between the actual value of the opening of the pusher side guide plate at the mill inlet and the opening setting value, or the difference between the actual value of the opening of the pusher side guide plate at the mill outlet and the opening setting value, based on the rolling direction. Then the difference is compared with the value of the steel plate side bending. Based on the comparison result, it is determined whether the steel plate has side bending. S4: When the calculation module determines that the steel plate has bent sideways, the output module sends relevant data information about the side bending of the steel plate to the official account and the mobile APP management client; if the calculation module determines that the steel plate has not bent sideways, the output module does not send relevant data information. S5: Staff with login accounts and passwords can log in to the official WeChat account or mobile APP management client to view relevant data information on steel plate lateral bending. The system can also send information about steel plate lateral bending to the official WeChat account and mobile APP management client via the output module, reminding staff and enabling them to adjust rolling parameters promptly based on this information.

[0010] Option 3 is the preferred option of the basic option. In S1, the side bending amount of the steel plate is 15mm. Through practical verification, when the pusher side guide plate before or after the rolling mill is stretched by more than 15mm, the steel plate will inevitably bend. Therefore, setting an appropriate side bending amount can avoid misjudgment or missed detection, thereby improving the reliability of side bending detection.

[0011] Option 4 is an optimal choice of the basic option. In S3, the method for determining the rolling direction is as follows: if the number of rolling passes retrieved by the calculation module in the PLC system is odd, it is forward rolling; if the number of rolling passes retrieved by the calculation module in the PLC system is even, it is reverse rolling. By directly associating the odd and even number of rolling passes with the rolling direction, the detection of steel plate side bending can be achieved without adding detection equipment. At the same time, it can match the reciprocating rolling mode of the four-roll reversible rolling mill, solving the adaptation problem of steel plate side bending detection under bidirectional rolling.

[0012] Option 5, an optimal choice from the basic option, uses the following method in S3 to determine whether the steel plate has experienced side bending: For forward rolling, the calculation module calculates the difference between the actual opening value and the set opening value of the pusher side guide plate at the mill exit. If the difference is greater than 15mm, the steel plate is determined to have experienced side bending; if the difference is less than or equal to 15mm, the steel plate is determined not to have experienced side bending. For reverse rolling, the calculation module calculates the difference between the actual opening value and the set opening value of the pusher side guide plate at the mill inlet. If the difference is greater than 15mm, the steel plate is determined to have experienced side bending; if the difference is less than or equal to 15mm, the steel plate is determined not to have experienced side bending. By comparing the difference between the actual opening value and the set opening value of the pusher side guide plate at the mill inlet or outlet in real time, the determination of steel plate side bending is achieved. Compared with static width detection, this method can more promptly determine whether a detection has occurred, and can also clearly distinguish between odd and even passes, quickly locating the side bending defect and facilitating timely adjustments by staff.

[0013] Option 6, an optimal choice from the basic option, involves the output module in S4 sending relevant data including the number of rolling passes where side bending occurred, the actual roll gap value of the pusher side guide plate, the set value of the pusher side guide plate opening at the mill entrance or exit, the actual value and difference of the pusher side guide plate opening at the mill entrance or exit, the set value and actual value of the work roll tilt; the side bending alarm information includes key parameters such as the number of passes, the work roll gap value, the set value and actual value of the work roll tilt, the actual value of the pusher side guide plate opening, and the deviation value. These parameters provide complete data information for process adjustment; at the same time, the specific pass in which the side bending occurred is recorded, facilitating the analysis of the cause of the side bending and the optimization of process parameters. Attached Figure Description

[0014] Figure 1 This is a schematic flowchart of a method for detecting the side bending of a hot-rolled thick plate in a single rolling mill according to the present invention. Detailed Implementation

[0015] The present invention will be further described in detail below through specific embodiments: Example 1 A detection system for side bending of hot-rolled wide and thick plates includes a data processing unit, a public WeChat account, and a mobile APP management client. The data processing unit includes a data acquisition module, a calculation module, and an output module. The data acquisition module is used to retrieve relevant data from the rolling mill PLC system. The calculation module is used to calculate the difference between the actual value and the set value of the opening of the pusher side guide plate at the rolling mill entrance and exit. The output module is used to output the relevant data information of the steel plate side bending to the public WeChat account and the mobile APP management client. The public WeChat account and the mobile APP management client are used by staff to view the relevant data information of the steel plate side bending.

[0016] Example 2 A method for detecting the side bending of a single-rolled hot-rolled thick plate, such as... Figure 1 The steps shown are as follows: S1: First, the acquisition module retrieves the opening degree setting value of the pusher side guide plate at the mill inlet and the opening degree setting value of the pusher side guide plate at the mill outlet from the PLC system. At the same time, the side bending amount of the steel plate is set to 15mm in the calculation module. S2: When the steel plate enters the rolling mill to start rolling, the encoder on the pusher side guide plate at the mill entrance detects the actual value of the opening degree of the pusher side guide plate at the mill entrance in real time and transmits the data to the PLC system. When the steel plate finishes rolling and leaves the mill exit, the encoder on the pusher side guide plate at the exit detects the actual value of the opening degree of the pusher side guide plate at the mill exit in real time and transmits the data to the PLC system. At the same time, the acquisition module retrieves the number of rolling passes of the steel plate and the opening degree setting value of the pusher side guide plate at the mill entrance and mill exit from the PLC system. S3: Then, the calculation module determines the rolling direction based on the number of rolling passes. If the number of rolling passes retrieved by the calculation module from the PLC system is odd, it is forward rolling, meaning the steel plate is rolled from the mill inlet to the mill outlet. If the number of rolling passes retrieved by the calculation module from the PLC system is even, it is reverse rolling, meaning the steel plate is rolled from the mill outlet to the mill inlet. Next, the calculation module calculates the difference between the actual opening value and the set opening value of the pusher side guide plate at the mill inlet, or the actual opening value of the pusher side guide plate at the mill outlet, based on the rolling direction. The difference between the actual value and the set value of the opening degree is calculated as follows: If it is forward rolling, the calculation module calculates the difference between the actual value of the opening degree of the pusher side guide plate at the mill exit and the set value of the opening degree. If the difference is greater than 15mm, it is determined that the steel plate has bent sideways; if the difference is less than or equal to 15mm, it is determined that the steel plate has not bent sideways. If it is reverse rolling, the calculation module calculates the difference between the actual value of the opening degree of the pusher side guide plate at the mill entrance and the set value of the opening degree. If the difference is greater than 15mm, it is determined that the steel plate has bent sideways; if the difference is less than or equal to 15mm, it is determined that the steel plate has not bent sideways. S4: When the calculation module determines that the steel plate has bent sideways, the output module sends relevant data information to the official account and mobile APP management client, including the number of rolling passes in which sideways bending occurred, the actual roll gap value of the pusher side guide plate, the opening degree setting value of the pusher side guide plate at the mill entrance or exit, the actual value and difference of the opening degree of the pusher side guide plate at the mill entrance or exit, the setting value and actual value of the work roll tilt; S5: Staff with login accounts and passwords can log in to the official WeChat account or mobile APP management client to view relevant data information on the side bending of the steel plate.

[0017] In summary, by retrieving the opening setting value of the pusher side guide plate using the above method and monitoring the displacement data of the side guide plate in real time during the rolling process, and analyzing the displacement changes of the side guide plate in real time through program logic, it is possible to determine whether the steel plate has experienced side bending. This eliminates the need for additional detection equipment, saving on the installation and maintenance costs of new equipment. Furthermore, it can accurately capture the time, pass, and tilt of the side guide plate work rolls when side bending occurs. Simultaneously, it can send relevant data when side bending occurs to a public WeChat account and a mobile APP management client. After logging into the public WeChat account or mobile APP management client, staff can adjust rolling parameters in a timely manner based on the relevant data information to prevent further deterioration of side bending. This provides an effective basis for process optimization and can reduce the frequency of side bending in future production processes.

[0018] The above descriptions are merely embodiments of the present invention, and common knowledge regarding specific structures and characteristics is not elaborated upon here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A detection system for side bending of a single hot-rolled thick plate, characterized in that, The system includes a data processing unit, a public WeChat account, and a mobile app management client. The data processing unit comprises a data acquisition module, a calculation module, and an output module. The data acquisition module retrieves relevant data from the rolling mill PLC system. The calculation module calculates the difference between the actual and set values ​​of the opening of the pusher side guide plates at the rolling mill inlet and outlet. The output module outputs relevant data information on the side bending of the steel plate to the public WeChat account and the mobile app management client, which are used by staff to view the relevant data information on the side bending of the steel plate.

2. A method for detecting the side bending of a single hot-rolled thick plate, characterized in that, Includes the following steps: S1: First, the acquisition module retrieves the opening degree setting value of the pusher side guide plate at the mill inlet and the opening degree setting value of the pusher side guide plate at the mill outlet from the PLC system, and at the same time sets the value of the steel plate side bending amount in the calculation module. S2: When the steel plate enters the rolling mill to start rolling, the encoder on the pusher side guide plate at the mill entrance detects the actual value of the opening degree of the pusher side guide plate at the mill entrance in real time and transmits the data to the PLC system. When the steel plate finishes rolling and leaves the mill exit, the encoder on the pusher side guide plate at the exit detects the actual value of the opening degree of the pusher side guide plate at the mill exit in real time and transmits the data to the PLC system. At the same time, the acquisition module retrieves the number of rolling passes of the steel plate and the opening degree setting value of the pusher side guide plate at the mill entrance and mill exit from the PLC system. S3: Then the calculation module determines the rolling direction based on the number of rolling passes. Then the calculation module calculates the difference between the actual value of the opening of the pusher side guide plate at the mill inlet and the opening setting value, or the difference between the actual value of the opening of the pusher side guide plate at the mill outlet and the opening setting value, based on the rolling direction. Then the difference is compared with the value of the steel plate side bending. Based on the comparison result, it is determined whether the steel plate has side bending. S4: When the calculation module determines that the steel plate has bent sideways, the output module sends the relevant data information of the steel plate bending sideways to the official account and the mobile APP management client; if the calculation module determines that the steel plate has not bent sideways, the output module does not send the relevant data information. S5: Staff with login accounts and passwords can log in to the official WeChat account or mobile APP management client to view relevant data information on the side bending of the steel plate.

3. The method for detecting side bending of a single hot-rolled thick plate according to claim 2, characterized in that, In S1, the lateral bending of the steel plate is 15mm.

4. The method for detecting side bending of a single hot-rolled thick plate according to claim 3, characterized in that, In S3, the method for determining the rolling direction is as follows: if the number of rolling passes retrieved by the calculation module in the PLC system is odd, it is forward rolling; if the number of rolling passes retrieved by the calculation module in the PLC system is even, it is reverse rolling.

5. The method for detecting side bending of a single hot-rolled thick plate according to claim 4, characterized in that, In S3, the method to determine whether the steel plate has been bent is as follows: if it is forward rolling, the calculation module calculates the difference between the actual value of the opening of the pusher side guide plate at the mill exit and the opening setting value. If the difference is greater than 15mm, it is determined that the steel plate has been bent. If the difference is less than or equal to 15mm, it is determined that the steel plate has not been bent. If it is reverse rolling, the calculation module calculates the difference between the actual value of the opening of the pusher side guide plate at the mill entrance and the set value of the opening. If the difference is greater than 15mm, it is determined that the steel plate has bent sideways. If the difference is less than or equal to 15mm, it is determined that the steel plate has not bent sideways.

6. The method for detecting side bending of a single hot-rolled thick plate according to claim 5, characterized in that, In S4, the relevant data information sent by the output module includes the number of rolling passes where side bending occurs, the actual roll gap value of the pusher side guide plate, the set value of the opening degree of the pusher side guide plate at the mill entrance or exit, the actual value and difference of the opening degree of the pusher side guide plate at the mill entrance or exit, the set value and actual value of the work roll tilt.

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