Method for reducing the occurrence of misregistration of the inner coil

Abstract

The application discloses a method for reducing the occurrence rate of misalignment of a coiling inner ring, comprising the following steps: providing a preparation unit, wherein the preparation unit comprises a welding machine, a tension roller, a weld detection instrument, a slitting shear, an EPC and a coiling machine arranged in sequence; adopting the preparation unit to coiling and reducing the diameter of a strip, wherein the strip has at least one weld after passing through the welding machine, and each weld is arranged with a crescent on both sides; when the weld detection instrument detects that the weld moves from a zero position to a set position by a set distance, the coiling centering device is switched to a manual mode, wherein the zero position is the position of the weld located directly below the weld detection instrument, and the distance from the crescent on both sides of each weld to the weld is less than the set distance. The method can improve the misalignment of the strip, reduce the misalignment of the strip, and further facilitate the improvement of the rolling mill output and the monthly material yield.

Description

Technical Field

[0001] This invention relates to the field of strip coiling control, and more particularly to a method for reducing the occurrence rate of misalignment in the inner coil during winding. Background Technology

[0002] The preparation unit is a process for the rolling mill, which involves welding and adjusting the material for the rolling mill and coiling and changing the diameter to improve the rolling mill's yield.

[0003] After the strip steel is prepared for welding, to prevent weld cracking, a crescent is cut on each side of the strip at the weld location. Because the weld forms a positive 3-degree angle with the unit's centerline, the crescents are staggered on both sides of the strip. When the crescents pass the detection probe of the coiler's centering device (EPC), the EPC detection probe deviates from the strip's centerline calculated through the strip's edge (although there is no actual deviation). This causes the centering hydraulic cylinder to pull the coiler to perform a centering action, resulting in misalignment of the steel coil.

[0004] When the steel coil has a large misalignment, the rolling force of the rolling mill is unstable during the rolling process. The rolling mill can only reduce its speed and, in severe cases, it may not be able to roll at all, which will affect the rolling mill output and reduce the monthly yield of the rolling mill. Summary of the Invention

[0005] In view of the above problems, the present invention is proposed to provide a method for reducing the occurrence rate of inner winding misalignment in order to overcome or at least partially solve the above problems.

[0006] This invention provides a method for reducing the occurrence rate of misalignment in the inner winding, the method comprising:

[0007] A preparation unit is provided, the preparation unit comprising a welding machine, a tension roller, a weld inspection instrument, a slitting shear, a coiling and centering device, and a coiler arranged in sequence;

[0008] The preparation unit is used to coil and change the diameter of the strip steel. After passing through the welding machine, the strip steel has at least one weld, and crescents are arranged on both sides of each weld. When the weld inspection instrument detects that the weld has moved a set distance from the zero point position to the set position, the coiling and centering device is switched to manual mode. The zero point position is the position when the weld is directly below the weld inspection instrument, and the distance from the crescents on both sides of each weld to the weld is less than the set distance.

[0009] Optionally, the set distance is 3.6 to 5.2 meters.

[0010] Optionally, the method further includes:

[0011] When the weld inspection instrument detects that the weld has reached the zero point position, it begins to calculate the distance the strip has moved.

[0012] Optionally, calculating the distance the strip has moved includes:

[0013] The motor speed of the tension roller is obtained by collecting the code disk feedback value of the motor encoder of the tension roller;

[0014] The length of the strip running is calculated based on the motor speed, thus obtaining the distance the strip moves.

[0015] Optionally, switching the curling centering device to manual mode includes:

[0016] A mode switching command is sent to the curling and centering device, the mode switching command being used to control the curling and centering device to switch to manual mode.

[0017] Optionally, the method further includes:

[0018] When the weld inspection instrument detects that the weld has moved more than the set distance from the zero point position, the curling and centering device is switched to automatic mode.

[0019] Optionally, the method further includes:

[0020] When the strip head winding length is less than or equal to the set length, the control unit operates at the first speed;

[0021] When the strip head winding length is greater than the set length, the control unit operates at a second speed, which is greater than the first speed.

[0022] Optionally, the set length is 35 to 45 m.

[0023] Optionally, the first speed is 25 m / min and the second speed is 200 m / min.

[0024] The technical solutions provided in the embodiments of the present invention have at least the following technical effects or advantages:

[0025] This invention provides a method for reducing the occurrence rate of inner coil misalignment. When the weld inspection instrument detects that at least one weld on the strip has moved a set distance from the zero point to a set position, the EPC is switched to manual mode. This ensures that the crescent-shaped areas on both sides of the weld will not be automatically detected by the EPC and mistakenly identified as strip misalignment. At this time, the EPC is switched to manual mode, meaning that the EPC will not perform centering operations, thereby improving misalignment, reducing strip misalignment, and thus helping to increase mill output and monthly yield.

[0026] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, and in order to make the above and other objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention are described below. Attached Figure Description

[0027] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0028] Figure 1 This is a flowchart of a method for reducing the occurrence rate of misalignment in the inner winding of a winding, provided by an embodiment of the present invention.

[0029] Figure 2 This is a simplified structural diagram of a preparation unit provided in an embodiment of the present invention. Detailed Implementation

[0030] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings.

[0031] The accompanying drawings illustrate various structural schematics according to embodiments of the present disclosure. These drawings are not to scale, and some details have been enlarged for clarity, and some details may have been omitted. The shapes of the various regions and layers shown in the drawings, as well as their relative sizes and positional relationships, are merely exemplary and may deviate from reality due to manufacturing tolerances or technical limitations. Furthermore, those skilled in the art can design regions / layers with different shapes, sizes, and relative positions as needed.

[0032] In the context of this disclosure, when a layer / component is referred to as being "above" another layer / component, that layer / component may be directly above the other layer / component, or there may be an intermediate layer / component between them. Additionally, if a layer / component is "above" another layer / component in one orientation, then when the orientation is reversed, that layer / component may be "below" the other layer / component. In the context of this disclosure, similar or identical components may be denoted by the same or similar reference numerals.

[0033] To better understand the above technical solutions, the following will describe the above technical solutions in detail with reference to specific implementation methods. It should be understood that the embodiments of this disclosure and the specific features in the embodiments are detailed descriptions of the technical solutions of this application, rather than limitations on the technical solutions of this application. In the absence of conflict, the embodiments of this application and the technical features in the embodiments can be combined with each other.

[0034] Figure 1 This is a flowchart of a method for reducing the occurrence rate of misalignment in the inner winding of a winding, provided by an embodiment of the present invention. Figure 1 As shown, the method includes:

[0035] Step S101: Provide a preparation unit.

[0036] Figure 2 This is a simplified structural diagram of a preparation unit provided in an embodiment of the present invention, as shown below. Figure 2 As shown, in this embodiment, the preparation unit 200 includes a welding machine 201, a tension roller 202, a weld seam inspector 203, a slitting shear 204, an EPC 205, and a coiler 206 arranged in sequence.

[0037] The EPC (Electronic Coupling and Centering Device) for the preparation unit is the EMG EVK-2CP. This device also includes two strip edge detection devices, crescent shears, a central controller, and a servo-valve-controlled correction hydraulic cylinder. The strip edge detection device contains two optical probes. One set of strip edge detection devices is installed on the drive side and the operating side of the unit to detect the edges of the strip. After the strip edge position is measured, the centerline position of the strip is calculated, and the centering hydraulic cylinder is controlled to pull the coiler, completing the centering and coiling of the strip during the coiling process. The crescent shears can be used to cut crescent edges on both sides of the weld after the strip welding is completed, preventing the weld edges from being scratched by equipment behind the unit due to the difference in strip width between the front and rear sections.

[0038] Step S102: Use the preparation unit to coil and change the diameter of the strip steel.

[0039] In this embodiment, the strip steel has at least one weld after passing through the welding machine, and crescent-shaped markings are arranged on both sides of each weld.

[0040] Step S103: When the weld inspection instrument detects that the weld has moved a set distance from the zero position to the set position, switch the EPC to manual mode.

[0041] The zero point position is the position of the weld when it is directly below the weld inspection instrument. The distance from the crescent on both sides of each weld to the weld is less than the set distance, so as to ensure that when the crescent on both sides of the weld passes through the EPC, the EPC will not be automatically recognized when it is switched to manual mode.

[0042] In this embodiment, the distance is set to 3.6 to 5.2 meters.

[0043] Optionally, the method further includes:

[0044] When the weld inspection instrument detects that the weld has reached the zero point, it begins to calculate the distance the strip has moved.

[0045] Specifically, the motor speed of the tension roller can be obtained by collecting the feedback value of the encoder disk of the tension roller motor; the length of the strip running can be calculated based on the motor speed to obtain the distance the strip moves.

[0046] For example, the length of the strip can be calculated by multiplying the running time of the strip and the speed of the motor, which is equal to the distance the strip moves.

[0047] Optionally, switch EPC to manual mode, including:

[0048] Send a mode switching command to the EPC. The mode switching command is used to control the EPC to switch to manual mode.

[0049] Optionally, the method may further include:

[0050] When the weld inspection instrument detects that the weld has moved more than the set distance from the zero point, the EPC will be switched to automatic mode.

[0051] In one implementation of this embodiment, the method may further include:

[0052] When the strip head winding length is less than or equal to the set length, the control unit runs at the first speed;

[0053] When the strip head winding length exceeds the set length, the control unit operates at the second speed;

[0054] The second speed is greater than the first speed.

[0055] For example, the length is set to 35-45m.

[0056] For example, the first speed is 25 m / min and the second speed is 200 m / min.

[0057] In this embodiment, when the set length is 35m, the unit operates at a speed of 25m / min within the first 35 meters of the winding head. On-site observation revealed that inner loop misalignment occurred within a few tens of meters of the winding head. This inner loop spanned several tens of meters, during which the speed increased from 25m / min to 200m / min. This resulted in large fluctuations in motor torque, significant speed changes, frequent EPC activation, and considerable variation in winding tightness. After multiple tests, it was found that maintaining a winding speed of 25m / min for the first 35 meters without increasing the speed before increasing to 200m / min ensured the stability of the inner loop winding, significantly reducing the occurrence rate of inner loop misalignment; in fact, inner loop misalignment almost disappeared.

[0058] The technical solutions provided in the embodiments of the present invention have at least the following technical effects or advantages:

[0059] This invention provides a method for reducing the occurrence rate of inner coil misalignment. When the weld inspection instrument detects that at least one weld on the strip has moved a set distance from the zero point to a set position, the EPC is switched to manual mode. This ensures that the crescent-shaped areas on both sides of the weld will not be automatically detected by the EPC and mistakenly identified as strip misalignment. At this time, the EPC is switched to manual mode, meaning that the EPC will not perform centering operations, thereby improving misalignment, reducing strip misalignment, and thus helping to increase mill output and monthly yield.

[0060] Numerous specific details are set forth in the specification provided herein. However, it will be understood that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification.

[0061] Similarly, it should be understood that, in order to simplify this disclosure and aid in understanding one or more of the various aspects of the invention, in the above description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together in a single embodiment, figure, or description thereof. However, this method of disclosure should not be construed as reflecting an intention that the claimed invention requires more features than are expressly recited in each claim. Rather, as reflected in the following claims, inventive aspects lie in fewer than all features of a single foregoing disclosed embodiment. Therefore, the claims following the detailed description are hereby expressly incorporated into this detailed description, wherein each claim itself is a separate embodiment of the invention.

[0062] It should be noted that the above embodiments are illustrative of the invention and not restrictive, and that those skilled in the art can devise alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses should not be construed as limiting the claims. The word "comprising" does not exclude the presence of components or steps not listed in the claims. The word "a" or "an" preceding a component does not exclude the presence of a plurality of such components. The invention can be implemented by means of hardware comprising several different components and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by the same item of hardware. The use of the words first, second, and third, etc., does not indicate any order. These words can be interpreted as names.

Claims

1. A method for reducing the occurrence rate of misalignment in the inner winding, characterized in that, The method includes: A preparation unit is provided, the preparation unit comprising a welding machine, a tension roller, a weld inspection instrument, a slitting shear, a coiling and centering device, and a coiler arranged in sequence; The preparation unit is used to coil and reduce the diameter of the strip steel. After passing through the welding machine, the strip steel has at least one weld. Each weld has crescent-shaped markings on both sides, and the crescent-shaped markings are staggered on both sides of the strip steel at the weld position. When the weld inspection instrument detects that the weld has moved a set distance from the zero point position to the set position, the coiling and centering device is switched to manual mode. The zero point position is the position when the weld is directly below the weld inspection instrument. The distance from the crescent-shaped markings on both sides of each weld to the weld is less than the set distance, which is 3.6 to 5.2 meters. When the weld inspection instrument detects that the weld has moved more than the set distance from the zero point position, the curling and centering device is switched to automatic mode; The method further includes: When the strip head winding length is less than or equal to the set length, the control unit operates at a first speed; when the strip head winding length is greater than the set length, the control unit operates at a second speed; wherein the second speed is greater than the first speed, and the set length is 35~45m.

2. The method according to claim 1, characterized in that, The method further includes: When the weld inspection instrument detects that the weld has reached the zero point position, it begins to calculate the distance the strip has moved.

3. The method according to claim 2, characterized in that, The calculation of the distance the strip has moved includes: The motor speed of the tension roller is obtained by collecting the code disk feedback value of the motor encoder of the tension roller; The length of the strip running is calculated based on the motor speed, thus obtaining the distance the strip moves.

4. The method according to claim 1, characterized in that, Switching the curling centering device to manual mode includes: A mode switching command is sent to the curling and centering device, the mode switching command being used to control the curling and centering device to switch to manual mode.

5. The method according to claim 1, characterized in that, The first speed is 25 m / min.

6. The method according to claim 1, characterized in that, The second speed is 200 m / min.

Images