Method for setting insertion amount of correction roll in zinc pot for continuous hot dip galvanizing of steel strip

Abstract

The application discloses a method for setting the insertion amount of a correction roller in a zinc pot for continuous hot galvanizing of a strip steel. Based on analysis of historical galvanizing performance data in the zinc pot area, a static table of the insertion amount of the correction roller is generated according to the six-digit code of the steel marking, thickness and width combination. According to the six-digit code of the steel marking, thickness and width combination of a new steel coil before galvanizing, the recommended insertion amount of the correction roller is obtained and recommended to the galvanizing unit. The application can realize the recommended and optimized insertion amount of the correction roller for the strip steel in online operation.

Description

Technical Field

[0001] This invention relates to the field of hot-dip galvanizing machinery and equipment, and more specifically, to a method for setting the insertion amount of the straightening roller inside the zinc pot for continuous hot-dip galvanizing of strip steel. Background Technology

[0002] During the hot-dip galvanizing process, the straightening rollers rotate with the strip steel, playing a role in stabilizing the strip and maintaining its shape. Different insertion depths of the straightening rollers will change the friction between the straightening rollers and the strip surface. Therefore, appropriate insertion depths of the straightening rollers can improve the galvanizing quality and safeguard product quality.

[0003] In continuous hot-dip galvanizing production, the setting of the insertion depth (i.e., the depth of insertion into the molten zinc) of the straightening rollers in the zinc pot relies heavily on the operator's experience. Therefore, even under the same production conditions, operators from different shifts may choose different insertion depths. This experience-based operating method currently suffers from drawbacks such as incomplete knowledge transfer and reliance on manual labor, hindering the automation and intelligentization of continuous hot-dip galvanizing units. However, there is currently no effective and reasonable solution to these issues for any continuous hot-dip galvanizing production line. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the purpose of this invention is to provide a method for setting the insertion amount of straightening rollers in a zinc pot for continuous hot-dip galvanizing of strip steel. This method involves analyzing historical galvanizing performance data of the zinc pot area to create a static table of straightening roller insertion amounts, and then recommending the insertion amount of straightening rollers based on the strip steel specifications in the current actual production process.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] This invention provides a method for setting the insertion amount of straightening rollers in a zinc pot for continuous hot-dip galvanizing of strip steel. Based on the analysis of historical galvanizing performance data of the zinc pot area, a static table of straightening roller insertion amounts is generated according to the combination of the six-digit code of the steel tap mark, thickness, and width. Based on the combination of the six-digit code of the steel tap mark, thickness, and width of the new steel coil before galvanizing, the recommended insertion amount of the straightening rollers is obtained and recommended to the galvanizing unit.

[0007] Preferably, it includes the following steps:

[0008] S1, collect historical galvanizing data for the zinc pot area, including current coil number, tap mark, thickness, width, zinc pot section speed, front tension, back tension, bearing and bushing structure, bearing and bushing service time, and actual insertion amount of the straightening roller;

[0009] S2, take the first six digits of the current coiled steel mark from the historical galvanizing performance data, and convert it into a six-digit code;

[0010] S3, classify according to the six-digit code combination of the steel tapping mark and the combination of thickness and width, and filter out the galvanized data under the same six-digit code combination of steel tapping mark and thickness and width;

[0011] S4. Analyze the galvanizing data for each combination, and select the optimal straightening roller insertion amount based on the mean, volatility and quartiles to form a static table of straightening roller insertion amount for each yard, thickness, width and straightening roller insertion amount.

[0012] S5, before the arrival of a new coil of steel, obtains the recommended insertion amount of the straightening roll based on the combination of the coil's tap mark, thickness, and width, and recommends it to the galvanizing unit.

[0013] Preferably, in step S1, the current coil number, steel tapping mark, thickness, and width are strip steel specification data; the zinc pot section speed, front tension, and rear tension are unit production process parameters; and the bearing bushing structure and bearing bushing service time are straightening roll bearing bushing data.

[0014] Preferably, in step S1, the bearing bush structure includes a three-point type and a round type.

[0015] Preferably, in step S3, the galvanizing data includes the zinc pot section speed, front tension, back tension, bearing and bushing structure, bearing and bushing service time, and actual insertion amount of the straightening roller.

[0016] Preferably, in step S4, the process of forming the static table of correction roller insertion amount for one code, one thickness, one width, and one correction roller insertion amount is as follows:

[0017] The mean, volatility, and quartiles of galvanizing data for the same bearing bushing structure in each combination were obtained to jointly determine the optimal value or optimal range of the straightening roller insertion amount for each combination.

[0018] The insertion amounts of each straightening roller are combined to form the galvanizing parameters for that combination.

[0019] The galvanizing parameters under each combination are combined to form a static table of the minimum particle straightening roller insertion amount under the six-digit code of the steel output mark and the combination of thickness and width.

[0020] This invention is the first to propose a method for setting the insertion amount of the straightening roller inside the zinc pot for continuous hot-dip galvanizing of strip steel.

[0021] 1. This invention analyzes historical galvanizing performance data to form a static table of one code, one thickness, one width, and one straightening roll insertion amount, enabling the recommended and optimized straightening roll insertion amount for strip steel running online; compared with manual experience, the static table of the minimum straightening roll insertion amount under the combination of six-digit code of steel exit mark, thickness, and width has a one-to-one correspondence and is more detailed.

[0022] 2. This invention will play a very positive role in improving production efficiency, product quality, and product competitiveness. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the continuous hot-dip high-aluminum zinc galvanizing production line of the present invention;

[0024] Figure 2 These are structural diagrams of bearing bushes and sleeves; (a) is a structural diagram of a round bearing bush and sleeve, and (b) is a structural diagram of a three-point bearing bush and sleeve.

[0025] Figure 3 This is a schematic flowchart of the method for setting the insertion amount of the straightening roller inside the zinc pot for continuous hot-dip galvanizing of strip steel according to the present invention.

[0026] In the diagram, 1 is the tension roller; 2 is the zinc pot; 3 is the submerged roller; 4 is the stabilizing roller; 5 is the straightening roller; 6 is the tower top roller; and a is the insertion amount of the straightening roller. Detailed Implementation

[0027] To better understand the above-mentioned technical solutions of the present invention, the technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0028] This invention provides for the first time a method for setting the insertion amount of straightening rollers in a zinc pot for continuous hot-dip galvanizing of strip steel. Based on the analysis of historical galvanizing performance data of the zinc pot area, a static table of straightening roller insertion amounts is generated according to the combination of the six-digit code of the steel tap mark, thickness, and width. Based on the combination of the six-digit code of the steel tap mark, thickness, and width of the new steel coil before galvanizing, the recommended insertion amount of the straightening rollers is obtained and recommended to the galvanizing unit.

[0029] Combination Figure 3 As shown, the method for setting the insertion amount of the straightening roller in the zinc pot for continuous hot-dip galvanizing of strip steel according to the present invention specifically includes the following steps:

[0030] S1, collect historical galvanizing data for the zinc pot area, including current coil number, tap mark, thickness, width, zinc pot section speed, front tension, back tension, bearing and bushing structure, bearing and bushing service time, and actual insertion amount of the straightening roller;

[0031] Combination Figure 1 The hot-dip galvanizing production line shown has the following specifications: current coil number, steel tap mark, thickness, and width are strip steel specifications; zinc pot section speed, front tension, and rear tension are unit production process parameters; and bearing bushing structure and bearing bushing service life are straightening roller bearing bushing data.

[0032] The insertion amount of the straightening roller directly affects the frictional force with the strip surface, which is related to the strip specifications (steel grade, thickness, width), production process (tension, speed), as well as the structure of the straightening roller bearing and bushing and its service life; therefore, it is necessary to obtain the above data in the actual production process.

[0033] Combination Figure 2 As shown in (a) and (b), the bearing bushing structure includes three-point and circular types. The circular and three-point bearing bushings differ significantly in structure. The circular bearing bushing involves direct hard friction between the bushing and the bearing, while the three-point bearing bushing does not. The stress distribution, friction between the straightening roller and the strip, and the manufacturing materials used in their operation differ, resulting in differences in service life and service condition over time. Therefore, the straightening roller insertion amount varies depending on the bearing bushing structure and service condition. Thus, the bearing bushing structure and service condition will be considered when creating the static table of straightening roller insertion amount. Different straightening roller insertion amounts are recommended for different bearing bushing structures.

[0034] S2, take the first six digits of the current coiled steel mark from the historical galvanizing performance data (a total of eight digits, the first six digits are related to the strip steel model), and convert it into a six-digit code;

[0035] The tapping mark, such as AN0543DJ, represents the type and strength grade of cold-rolled strip steel. The conversion logic for its first six digits is as follows: A corresponds to 1, N corresponds to 2, ..., specifically defined according to the tapping mark of the products produced by the mill. The conversion effect is shown in Table 1.

[0036] Table 1 shows the first six digits of the steel tapping marks.

[0037] The first six digits of the steel tapping mark The top six AN0543 120543 AN0691 120691 AN0891 120891 AN1053 121053 AN1064 121064 AN1111 121111 AN1122 121122

[0038] S3, classify according to the six-digit code combination of the steel tapping mark and the thickness and width combination, and filter out the galvanizing data (zinc pot section speed, front tension, back tension, bearing and bushing structure, bearing and bushing service time, and actual insertion amount of the straightening roller) under the same six-digit code combination of the steel tapping mark and the thickness and width combination.

[0039] In actual production, due to the different specifications required by the machine combination contract order, there are often multiple thicknesses under the same steel tapping mark. If a static table is made for each thickness, it will lead to an 'exponential explosion' of subsequent static tables. Therefore, in order to optimize the number of static tables, the thickness can be classified, as shown in Table 2. The width specifications are fewer than the thickness specifications, so they are not classified and are combined according to the actual width.

[0040] Table 2 Thickness Classification

[0041] Set thickness Thickness classification 0.20＜t≤0.39 0.3 0.39＜t≤0.49 0.4 0.49＜t≤0.59 0.5 0.59＜t≤0.69 0.6 0.69＜t≤0.79 0.7

[0042] S4. Analyze the galvanizing data for each combination, and select the optimal straightening roller insertion amount based on the mean, volatility and quartiles to form a static table of straightening roller insertion amount for each yard, thickness, width and straightening roller insertion amount.

[0043] In this step, the process of forming the static table of straightening roller insertion amount, which includes one code, one thickness, one width, and one straightening roller insertion amount, is as follows:

[0044] The mean, volatility, and quartiles of the galvanizing data for each combination under the same bearing bushing structure are obtained to jointly determine the optimal value or optimal range of the straightening roller insertion amount for each combination.

[0045] The insertion amounts of each straightening roller are combined to form the galvanizing parameters for that combination.

[0046] The galvanizing parameters under each combination are combined to form a static table of the minimum particle straightening roller insertion amount under the six-digit code of the steel output mark and the combination of thickness and width.

[0047] S5, before the arrival of a new coil of steel, obtains the optimal recommended insertion amount of the straightening rolls based on the combination of the coil's tap mark, thickness, and width, and recommends it to the galvanizing unit.

[0048] Example

[0049] This embodiment is Figure 1 The data shown in Table 3 for a certain hot-dip galvanizing unit over the past six months includes historical galvanizing performance data for the zinc pot area, such as steel tapping mark, thickness, width, front tension, back tension, zinc pot section speed, straightening roller bearing and bushing structure, bearing and bushing service time, and actual insertion amount of the straightening roller.

[0050] Table 3 Historical Galvanizing Performance Data for Zinc Pot Area

[0051]

[0052]

[0053] Based on historical galvanizing performance data, the first six digits of the current coiled steel mark are taken (a total of eight digits, the first six digits are related to the strip steel model), and the six digits are converted into a string;

[0054] Classify the galvanizing data (front tension, back tension, zinc pot section speed, straightening roller bearing and bushing structure, bearing and bushing service time, and actual insertion amount of straightening roller) according to the six-digit code combination of the steel tapping mark and the thickness and width combination.

[0055] The galvanizing data for each combination is analyzed, and the mathematical characteristics such as the mean, volatility, and quartiles of other galvanizing data under the same bearing bush structure are calculated. Based on the mathematical characteristics such as the mean, volatility, and quartiles, the optimal straightening roller insertion amount is selected, forming a static table of straightening roller insertion amount with one yard, one thickness, one width, and one straightening roller insertion amount.

[0056] The screening process is as follows: First, based on historical galvanizing performance data from the past six months, targets are screened according to the combination range of the same six-digit steel mark and the same thickness and width. Then, the mean and standard deviation are calculated to initially screen data within the range of mean ± 3 standard deviations. Then, data within [25%, 75%] are further screened based on quartiles, and the mode is calculated. After multiple rounds of data screening to remove unstable and random data, the final mode is the galvanizing parameter and the straightening roll insertion parameter, that is, the optimal value or optimal range of the straightening roll insertion for each combination.

[0057] Then, the insertion amount of the straightening roller for each combination is combined to form the galvanizing parameters for that combination; the galvanizing parameters for each combination are combined to form a static table of the minimum particle straightening roller insertion amount under the six-digit code of the steel exit mark and the combination of thickness and width. Taking the steel exit mark APO951E9 as an example, its static table is shown in Table 4.

[0058] Table 4 Static Table of Straightening Roller Insertion Amount

[0059]

[0060]

[0061] Before a new coil of steel arrives, the optimal recommended insertion depth of the straightening roll is determined based on the combination of the coil's tap mark, thickness, and width. This recommended depth is 4mm and is then provided to the galvanizing unit. The insertion depth of the straightening roll in the galvanizing unit can be set according to the above recommended insertion depth.

[0062] Those skilled in the art should recognize that the above embodiments are merely illustrative of the present invention and are not intended to limit the present invention. Any variations or modifications to the above embodiments that are within the spirit and essence of the present invention will fall within the scope of the claims of the present invention.

Claims

1. A method for setting the insertion amount of the straightening roller inside the zinc pot for continuous hot-dip galvanizing of strip steel, characterized in that: Based on the analysis of historical galvanizing performance data in the zinc pot area, a static table of straightening roll insertion amounts is generated according to the combination of the six-digit code of the steel tap mark, thickness, and width. Based on the combination of the six-digit code of the steel tap mark, thickness, and width of the new steel coil before galvanizing, the recommended insertion amount of the straightening roll is obtained and recommended to the galvanizing unit.

2. The method for setting the insertion amount of the straightening roller in the zinc pot for continuous hot-dip galvanizing of strip steel according to claim 1, characterized in that... Specifically, it includes the following steps: S1, collect historical galvanizing data for the zinc pot area, including current coil number, tap mark, thickness, width, zinc pot section speed, front tension, back tension, bearing and bushing structure, bearing and bushing service time, and actual insertion amount of the straightening roller; S2, take the first six digits of the current coiled steel mark from the historical galvanizing performance data, and convert it into a six-digit code; S3, classify according to the six-digit code combination of the steel tapping mark and the combination of thickness and width, and filter out the galvanized data under the same six-digit code combination of steel tapping mark and thickness and width; S4. Analyze the galvanizing data for each combination, and select the optimal straightening roller insertion amount based on the mean, volatility and quartiles to form a static table of straightening roller insertion amount for each yard, thickness, width and straightening roller insertion amount. S5, before the arrival of a new coil of steel, obtains the recommended insertion amount of the straightening roll based on the combination of the coil's tap mark, thickness, and width, and recommends it to the galvanizing unit.

3. The method for setting the insertion amount of the straightening roller in the zinc pot for continuous hot-dip galvanizing of strip steel according to claim 2, characterized in that: In step S1, the current coil number, steel tapping mark, thickness, and width are strip steel specification data; the zinc pot section speed, front tension, and back tension are unit production process parameters; and the bearing bushing structure and bearing bushing service time are straightening roll bearing bushing data.

4. The method for setting the insertion amount of the straightening roller in the zinc pot for continuous hot-dip galvanizing of strip steel according to claim 2, characterized in that: In step S1, the bearing bushing structure includes a three-point type and a round type.

5. The method for setting the insertion amount of the straightening roller in the zinc pot for continuous hot-dip galvanizing of strip steel according to claim 2, characterized in that: In step S3, the galvanizing data includes the zinc pot section speed, front tension, back tension, bearing and bushing structure, bearing and bushing service time, and actual insertion amount of the straightening roller.

6. The method for setting the insertion amount of the straightening roller in the zinc pot for continuous hot-dip galvanizing of strip steel according to claim 2, characterized in that: In step S4, the process of forming the static table of correction roller insertion amount (one code, one thickness, one width, one correction roller insertion amount) is as follows: The mean, volatility, and quartiles of galvanizing data for the same bearing bushing structure in each combination were obtained to jointly determine the optimal value or optimal range of the straightening roller insertion amount for each combination. The insertion amounts of each straightening roller are combined to form the galvanizing parameters for that combination. The galvanizing parameters under each combination are combined to form a static table of the minimum particle straightening roller insertion amount under the six-digit code of the steel output mark and the combination of thickness and width.

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