A method for precise control of strip tail length in uncoiler unit

Abstract

This invention discloses a method for precisely controlling the strip tailing length of an uncoiler in a continuous annealing mill. The method includes the following steps: obtaining the outer diameter of the steel coil after the pickling and rolling process, the inner diameter of the uncoiler, and the thickness of the strip; determining the effective value of the inner diameter of the steel coil based on the strip thickness and the inner diameter of the uncoiler using a standard for adjusting the inner diameter of the steel coil; and obtaining the strip tailing length of the uncoiler using a formula based on the outer diameter of the steel coil, the effective value of the inner diameter of the steel coil, and the thickness of the strip. This method allows for accurate calculation of the steel coil length on the uncoiler, enabling operators to prepare for operations in advance based on the strip length, ensuring that the shearing length meets process requirements, improving product yield, reducing mill malfunctions, and generating significant economic benefits. This invention also optimizes the tension force of the uncoiler drum to achieve tight contact between the steel coil and the drum, preventing the strip from slipping on the uncoiler drum; and shortens the periodic calibration of the uncoiler drum, avoiding errors in the tailing length calculation.

Description

Technical Field

[0001] This invention belongs to the field of electrical control equipment in the metallurgical industry, and relates to a method for precise control of the tail length of strip steel in the uncoiler of a continuous annealing unit. Background Technology

[0002] The uncoiler of a continuous annealing unit for cold-rolled products is a key piece of equipment, mainly used to control the uncoiling of the steel coil at the entrance of the continuous annealing unit, enabling the strip steel to enter the production line. Various factors, such as uncoiler slippage, errors in the inner diameter of the coil, and loose inner coiling of the steel coil, affect the inaccurate calculation of the remaining steel coil length on the uncoiler, resulting in excessive deviation in the strip tailing length and failing to meet the tailing length requirements for production operations. This is mainly manifested in:

[0003] 1. During the production of thin strip, the actual strip tail length is about 50m longer than the value set on the operation interface. The excessive tail length will inevitably result in more cutting blades on the head shear, affecting the preparation time of the next coil and restricting the production rhythm of the inlet section. At the same time, strip with excessive tail length will be cut and discarded, which will seriously affect the strip yield, reducing the yield by up to 1% at most, and restricting the improvement of the yield of the continuous annealing unit.

[0004] 2. During the production of thick materials, occasionally the actual strip tail length is shorter than the value set on the operating interface. This is because during the previous rolling process, the core of the strip has a certain length that is too thick or has been incompletely sheared. When the tail is too short, the strip will inevitably not be cut long enough to meet the shearing length requirements set by the operator. In severe cases, the strip tail may escape from the welding machine, making welding impossible and causing the unit to slow down or stop. Summary of the Invention

[0005] In order to solve the problems of (1) slippage of the uncoiler drum during normal production, which affects the calculation and analysis of the tailing length and causes inaccurate length cutting during actual tailing; and (2) error in the inner ring value of the drum, which affects the periodic calibration of the uncoiler drum; the present invention provides the following technical solution: a method for precise control of the tailing length of strip steel in the uncoiler of a continuous annealing unit, comprising the following steps:

[0006] Obtain the outer diameter of the steel coil after the pickling and rolling process, the inner diameter of the uncoiler, and the thickness of the strip.

[0007] Based on the thickness of the strip and the inner diameter length of the uncoiler, the effective value of the inner diameter of the steel coil is determined using the inner diameter adjustment standard of the steel coil.

[0008] Based on the outer diameter of the steel coil, the effective value of the inner diameter of the steel coil, and the thickness of the strip, the tail-wagging length is calculated using the tail-wagging length calculation formula to obtain the tail-wagging length of the strip from the uncoiler.

[0009] Furthermore: the process of determining the effective value of the inner diameter of the steel coil based on the thickness m of the strip and the inner diameter length d of the uncoiler using the inner diameter adjustment standard of the steel coil is as follows:

[0010] When the thickness m of the strip is less than 0.4 mm, the effective value of the inner diameter of the steel coil is determined to be (d-4) mm.

[0011] When the thickness of the strip is 1.0mm ≥ m ≥ 0.4mm, the effective value of the inner diameter of the steel coil is determined to be (d-3)mm;

[0012] When the thickness of the strip is greater than 1.0 mm, the effective value of the inner diameter of the steel coil is determined to be (d-1) mm.

[0013] Furthermore, the formula for calculating the drift length is as follows:

[0014]

[0015] Furthermore, this method is applicable to steel coils with a thickness of less than 3mm produced by continuous annealing galvanizing units.

[0016] A device for precisely controlling the tail length of strip steel in a continuous annealing mill uncoiler includes:

[0017] Acquisition module: used to acquire the outer diameter length of the steel coil after the pickling and rolling process, the inner diameter length of the uncoiler, and the thickness of the strip.

[0018] Determining module: Used to determine the effective value of the inner diameter of the steel coil based on the thickness of the strip and the inner diameter length of the uncoiler, using the inner diameter adjustment standard of the steel coil;

[0019] The module is used to calculate the tail length of the strip from the uncoiler based on the outer diameter of the coil, the effective value of the inner diameter of the coil, and the thickness of the strip, using the tail length calculation formula.

[0020] A computer-readable storage medium storing a computer program, wherein when the computer program is executed, it performs the aforementioned method for precise control of the strip tail length of an undulating mill uncoiler.

[0021] This invention provides a method for precise control of the strip tail length of the uncoiler in a continuous annealing unit. It can accurately calculate the length of the steel coil on the uncoiler, allowing operators to prepare for operation in advance based on the strip length, ensuring that the shearing length meets process requirements, improving product yield and reducing unit failures, and generating significant economic benefits.

[0022] This invention optimizes the tension of the uncoiler drum to achieve close contact between the steel coil and the drum, preventing the strip from slipping on the uncoiler drum; it also shortens the periodic calibration of the uncoiler drum and avoids errors in the calculation of the tail length. Attached Figure Description

[0023] 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.

[0024] Figure 1 This is a schematic diagram of the upper channel steel strip threading;

[0025] Figure 2 This is a schematic diagram of an uncoiler drum; Detailed Implementation

[0026] It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0027] 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.

[0028] 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.

[0029] 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.

[0030] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0031] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation besides the orientation of the device as described in the figures. For example, if the device in the figures is inverted, a device described as "above" or "above" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0032] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0033] Figure 1This is a schematic diagram of the upper channel steel strip threading;

[0034] Figure 2 This is a schematic diagram of an uncoiler drum;

[0035] The outer diameter of the steel coil is affected by the strip thickness, while the inner diameter is determined by the uncoiler drum's expansion diameter. The strip thickness is determined by the previous process and cannot be changed in this process. Therefore, controlling the shearing length deviation is achieved by controlling the accuracy of the uncoiler's expansion diameter. Loose inner coiling causes inaccurate calculations of the outer coiling, affecting the calculated coil length. The tail-end length calculation formula shows that the inner diameter d and pi are constants, while only the outer diameter D is a variable. The tail-end length is calculated based on the outer diameter, but because the inner coiling of the strip is not tight, the outer diameter changes differently from the actual value, resulting in a discrepancy between the calculated and actual tail-end length, thus affecting the accuracy of the tail-end shearing length at the entry section.

[0036] Based on long-term field observations and studies on shearing amounts at different thicknesses, the following conclusions were drawn:

[0037] ① When the strip thickness is below 0.4mm, the error is greatest due to the thin strip and loose coil, resulting in a tail length that is 30 meters longer.

[0038] ② The strip thickness is between 0.4-1.0mm. The steel coil is not tightly packed, which causes general error and the tail length is 20 meters longer.

[0039] ③ The strip thickness is above 1.0mm, the steel coil is not tightly packed, which causes the least error, and the tail length is 10 meters longer.

[0040] A method for precisely controlling the tail length of strip steel in an annealing mill includes the following steps:

[0041] S1: Obtain the outer diameter of the steel coil after the pickling and rolling process, the inner diameter of the uncoiler, and the thickness of the strip.

[0042] S2: Based on the thickness of the strip and the inner diameter length of the uncoiler, the effective value of the inner diameter of the steel coil is determined using the inner diameter adjustment standard of the steel coil.

[0043] S3: Based on the outer diameter of the steel coil, the effective value of the inner diameter of the steel coil, and the thickness of the strip, the tail length of the strip is obtained by using the tail length calculation formula.

[0044] Steps S1 / S2 / S3 are executed sequentially; this method is applicable to continuous annealing galvanizing units producing steel coils with a thickness of less than 3mm. 3mm thickness refers to the thickness of the produced steel coil / strip.

[0045] Furthermore, the process of determining the effective value of the inner diameter of the steel coil based on the thickness m of the strip and the inner diameter length d of the uncoiler using the inner diameter adjustment standard of the steel coil is as follows:

[0046] When the thickness of the strip steel m < 0.4 mm, the effective value of the inner diameter of the steel coil is determined to be (d-4) mm; the subtracted 4 mm is the inner diameter (diameter) value of the uncoiler drum on site, and the inner diameter (diameter) value of the uncoiler drum when it is unwound is 610 mm.

[0047] When the thickness of the strip is 1.0mm ≥ m ≥ 0.4mm, the effective value of the inner diameter of the steel coil is determined to be (d-3)mm;

[0048] When the thickness of the strip is greater than 1.0 mm, the effective value of the inner diameter of the steel coil is determined to be (d-1) mm.

[0049] Furthermore, the formula for calculating the drift length is as follows:

[0050] (1)

[0051] Where: D - is the outer diameter of the steel coil; d - is the inner diameter of the steel coil; - is a constant value.

[0052] Formula (1) is derived from the following formula:

[0053] (2)

[0054] By optimizing the PLC program control logic and adjusting the inner diameter of the steel coil, the tail length L is reduced accordingly, thus achieving a match between the tail length of the steel coil and the actual length.

[0055] A device for precisely controlling the tail length of strip steel in a continuous annealing mill uncoiler includes:

[0056] Acquisition module: used to acquire the outer diameter length of the steel coil after the pickling and rolling process, the inner diameter length of the uncoiler, and the thickness of the strip.

[0057] Determining module: Used to determine the effective value of the inner diameter of the steel coil based on the thickness of the strip and the inner diameter length of the uncoiler, using the inner diameter adjustment standard of the steel coil;

[0058] The module is used to calculate the tail length of the strip from the uncoiler based on the outer diameter of the coil, the effective value of the inner diameter of the coil, and the thickness of the strip, using the tail length calculation formula.

[0059] A computer-readable storage medium storing a computer program, wherein when the computer program is executed, it performs the aforementioned method for precise control of the strip tail length of an undulating mill uncoiler.

[0060] 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 precisely controlling the tail length of strip steel in an annealing mill, characterized in that: Includes the following steps: Obtain the outer diameter length of the steel coil after the pickling and rolling process, the inner diameter length of the uncoiler, and the thickness of the strip steel; Based on the thickness of the strip and the inner diameter length of the uncoiler, the effective value of the inner diameter of the steel coil is determined using the inner diameter adjustment standard of the steel coil. Based on the outer diameter of the steel coil, the effective value of the inner diameter of the steel coil, and the thickness of the strip, the tail-wagging length is calculated using the tail-wagging length calculation formula to obtain the tail-wagging length of the strip in the uncoiler. The process of determining the effective value of the inner diameter of the steel coil based on the thickness m of the strip and the inner diameter length d of the uncoiler using the inner diameter adjustment standard of the steel coil is as follows: When the thickness m of the strip is less than 0.4 mm, the effective value of the inner diameter of the steel coil is determined to be (d-4) mm. When the thickness of the strip is 1.0mm ≥ m ≥ 0.4mm, the effective value of the inner diameter of the steel coil is determined to be (d-3)mm; When the thickness of the strip is greater than 1.0 mm, the effective value of the inner diameter of the steel coil is determined to be (d-1) mm.

2. The method for precisely controlling the tail length of strip steel in the uncoiler of a continuous annealing mill according to claim 1, characterized in that: The formula for calculating the tail length is as follows: 。 3. The method for precisely controlling the tail length of strip steel in the uncoiler of a continuous annealing unit according to claim 1, characterized in that: This method is applicable to steel coils with a thickness of less than 3mm produced by continuous annealing galvanizing units.

4. A method for precisely controlling the tail length of strip steel in the uncoiler of a continuous annealing unit, characterized in that: Includes the following steps: Acquisition module: used to acquire the outer diameter length of the steel coil after the pickling and rolling process, the inner diameter length of the uncoiler, and the thickness of the strip. Determining module: Used to determine the effective value of the inner diameter of the steel coil based on the thickness of the strip and the inner diameter length of the uncoiler, using the inner diameter adjustment standard of the steel coil; The module is used to calculate the tail length of the strip from the uncoiler based on the outer diameter of the coil, the effective value of the inner diameter of the coil, and the thickness of the strip, using the tail length calculation formula.

5. A computer-readable storage medium storing a computer program, wherein, When the computer program is executed, it performs the precise control method for the tail length of the strip in the uncoiler of the continuous annealing unit as described in any one of claims 1-3.

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