Roll changing method for a reversing rolling mill and a protective pad
By placing protective pads on the strip surface and wrapping the work rolls, the problem of strip scratches during roll changing in reversible rolling mills was solved, enabling high-quality roll changing operations and improving product quality and production efficiency.
Patent Information
- Application Number
- CN202310371946.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2023-04-10
- Publication Date
- 2025-11-18
- Estimated Expiration
- 2043-04-10
AI Technical Summary
Existing reversible rolling mills are prone to causing scratches on the strip surface during roll changing, which cannot meet high-quality standards and affects product quality and production capacity.
By placing protective pads on the strip surface and wrapping the work rolls with side ears, combined with the position adjustment of the injection manifold of the reversible rolling mill, the work rolls can be safely replaced, avoiding scratches with the strip and the rolling mill.
It effectively reduces scratches and dents on the surface of strip steel, improves product quality and rolling mill capacity, and reduces production costs.
Smart Images
Figure CN116765140B_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of process manufacturing technology for reversible rolling mills, and more particularly to a roll changing method for a reversible rolling mill and a protective pad. Background Technology
[0002] Before the finished product pass of a reversible rolling mill, the rolls need to be replaced twice. Current manufacturing demands increasingly stringent standards for strip surface quality, especially for new energy steel grades, which do not accept roll scratches. The existing method of roll replacement involves manual roll loading by operators. However, due to the limited operational space at the roll gap in reversible rolling mills, the work rolls easily rub against the strip, causing scratches on the strip surface. During use, periodic roll scratches form on the strip surface, failing to meet usage standards and severely impacting strip surface quality and mill capacity. If these surface defects are not detected and carried over to the next process, they can easily lead to quality degradation and quality disputes. Summary of the Invention
[0003] The purpose of this application is to provide a roll changing method for a reversible rolling mill and a protective pad, so as to solve to some extent the technical problem of scratches on the strip surface caused by the roll changing process in a reversible rolling mill.
[0004] To solve the above-mentioned technical problems, this application adopts the following technical solution:
[0005] The first aspect of this application provides a roll changing method for a reversible rolling mill, comprising the following steps: adjusting the positions of the upper and lower injection manifolds of the reversible rolling mill; driving the lower injection manifold to rise and lift the strip, replacing the work roll below the strip, and then resetting the lower injection manifold; placing a protective pad on the upper surface of the strip, controlling the upper injection manifold to descend and press the protective pad, and using the side lugs of the protective pad to wrap around the work roll above the strip; replacing the work roll above the strip, and then resetting the upper injection manifold; driving the reversible rolling mill to carry the protective pad out, completing the roll changing.
[0006] In some embodiments, the specific steps for adjusting the positions of the upper and lower injection manifolds of the reversible rolling mill are as follows: by using the control system of the reversible rolling mill, the upper injection manifold is adjusted to the upper limit position, and the lower injection manifold is adjusted to the lower limit position.
[0007] In some embodiments, the specific steps for replacing the work roll below the strip are as follows: the work roll to be replaced is removed using a roll changing trolley, and then a new work roll is installed using the roll changing trolley.
[0008] In some embodiments, during the process of loading a new work roll using a roll changing trolley, the work roll needs to be kept tilted, with the front lower than the back, to ensure that the upper end of the work roll does not scrape the strip and the lower end of the work roll does not scrape the rolling mill during loading.
[0009] In some embodiments, the specific steps of placing a protective pad on the upper surface of the strip are as follows: place the protective pad in the gap between the strip and the upper injection manifold, the protective pad needs to completely cover the surface of the strip, and confirm that there are no debris on the surface of the protective pad.
[0010] In some embodiments, the specific steps for replacing the work roll above the strip are as follows: using a roll changing trolley to remove the work roll to be replaced from the side lug of the protective pad, and then using the roll changing trolley to load the new work roll into the reversible rolling mill while it is wrapped in the side lug.
[0011] In some embodiments, during the process of loading a new work roll using a roll changing trolley, the work roll needs to be kept tilted, with the front lower than the back, to ensure that the lower end of the work roll does not scrape the strip and the upper end of the work roll does not scrape the rolling mill during loading.
[0012] In some embodiments, the specific steps for driving the reversible mill to carry out the protective pad are as follows: drive the mill core to rotate, carry the protective pad out of the work roll, and then shut down the mill and remove the protective pad.
[0013] A second aspect of this application provides a protective pad used in a roll changing method for a reversible rolling mill. The protective pad includes: a main pad body for placement on a strip; side ears connected to the main pad body, which, in use, are used to wrap around a work roll; and a handle disposed on the main pad body.
[0014] In some embodiments, the main pad is made of rubber.
[0015] As can be seen from the above technical solution, this application has at least the following advantages and positive effects:
[0016] This application discloses a roll changing method for a reversible rolling mill. By placing a protective pad on the upper surface of the strip and wrapping the work roll with the side lugs of the protective pad, the work roll is protected by the side lugs and the protective pad during the roll changing process. This effectively reduces scratches on the strip during the roll changing process of the reversible rolling mill, reduces the abnormal roll changing rate, reduces quality defects such as dents and scratches on the strip surface, improves product quality and rolling mill capacity, and reduces production costs.
[0017] The protective pad described in this application wraps around the work roll with its side lugs, ensuring that the work roll is protected by the side lugs and the protective pad during the replacement process. This effectively reduces scratches on the strip during roll changing in reversible rolling mills, reduces abnormal roll changing rates, lowers quality defects such as dents and scratches on the strip surface, improves product quality and rolling mill capacity, and reduces production costs. Attached Figure Description
[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0019] Figure 1 This is a process flow diagram of a roll changing method for a reversible rolling mill according to an embodiment.
[0020] Figure 2 This is one of the process steps of a roll changing method for a reversible rolling mill according to an embodiment;
[0021] Figure 3 This is a second process step diagram of a roll changing method for a reversible rolling mill according to an embodiment;
[0022] Figure 4 This is the third process step diagram of a roll changing method for a reversible rolling mill according to an embodiment;
[0023] Figure 5 This is the fourth step diagram of a roll changing method for a reversible rolling mill according to an embodiment;
[0024] Figure 6 This is the fifth step diagram of a roll changing method for a reversible rolling mill according to an embodiment;
[0025] Figure 7 This is the sixth step diagram of a roll changing method for a reversible rolling mill according to an embodiment;
[0026] Figure 8 This is a schematic diagram of the structure of a protective pad according to an embodiment.
[0027] The reference numerals in the attached drawings are explained as follows: 1. Upper spray manifold; 2. Lower spray manifold; 3. Strip steel; 4. Work roller; 5. Protective pad; 51. Main pad body; 52. Side lug; 53. Handle. Detailed Implementation
[0028] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0029] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and 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. Therefore, they should not be construed as limitations on this application.
[0030] The terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first," "second," or "third" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "multiple" means two or more.
[0031] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "connection," "installation," "connection," and "linkage" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.
[0032] Please see Figures 1-7 .
[0033] Figure 1 This is a process flow diagram of a roll changing method for a reversible rolling mill according to an embodiment of this application. Figures 2-7 This is a process flowchart of a roll changing method for a reversible rolling mill according to an embodiment of this application, as shown in the figure: It includes the following steps:
[0034] S1: Adjust the position of the upper injection manifold 1 and the lower injection manifold 2 of the reversible rolling mill;
[0035] Specifically, such as Figure 2 As shown, the upper injection manifold 1 is adjusted to the upper limit position and the lower injection manifold 2 is adjusted to the lower limit position through the control system of the reversible rolling mill.
[0036] S2: Drive the lower injection manifold 2 to rise and lift the strip 3, replace the work roll 4 below the strip 3, and then the lower injection manifold 2 is reset;
[0037] Specifically, such as Figure 3As shown, the strip 3 is lifted by the upward movement of the injection manifold 2 driven by the control system of the reversible rolling mill. The work roll 4 that needs to be replaced is taken out by the roll changing trolley, and then the new work roll 4 is loaded by the roll changing trolley. In the specific implementation process of this embodiment, the work roll 4 needs to be kept tilted during the loading process, with the front lower and the back higher, to ensure that the upper end of the work roll 4 does not scrape the strip 3 and the lower end of the work roll 4 does not scrape the rolling mill during the loading process.
[0038] S3: Place a protective pad 5 on the upper surface of the strip 3, control the upper spray manifold 1 to descend and press the protective pad 5, and use the side lugs 52 of the protective pad 5 to wrap the work roll 4 above the strip 3.
[0039] Specifically, such as Figure 4 As shown, place the protective pad 5 in the gap between the strip steel 3 and the upper spray manifold 1. The protective pad 5 needs to completely cover the surface of the strip steel 3. Confirm that there are no foreign objects on the surface of the protective pad 5.
[0040] S4: Replace the work roll 4 above the strip 3, and then reset the upper injection manifold 1;
[0041] Specifically, such as Figure 5 As shown, the work roll 4 to be replaced is removed from the side lug 52 of the protective pad 5 using a roll changing trolley, and then the new work roll 4 is loaded into the reversible rolling mill while still encased in the side lug 52 using the roll changing trolley.
[0042] S5: Drive the reversible rolling mill to carry out the protective pad 5, completing the roll change.
[0043] Specifically, such as Figure 7 As shown, the core of the rolling mill is driven to rotate, bringing the protective pad 5 off the work roll 4. Then the rolling mill is shut down and the protective pad 5 is removed.
[0044] In the specific implementation of this embodiment, such as Figure 6 As shown, during the loading process, the upper work roll 4 needs to be kept tilted, with the front lower and the back higher, to ensure that the lower end of the work roll 4 does not scrape the strip 3 and the upper end of the work roll 4 does not scrape the rolling mill. During the loading process, the force needs to be adjusted at all times. It is important to avoid using too much force. If there is any obstruction, stop loading the roll, adjust the angle, and continue loading until the work roll 4 is fully loaded.
[0045] By placing a protective pad 5 on the upper surface of the strip 3 and wrapping the work roll 4 with the side lugs 52 of the protective pad 5, the work roll 4 is protected by the side lugs 52 and the protective pad 5 during the replacement process. This effectively reduces the scratches on the strip 3 during the roll change process of the reversible rolling mill, reduces the abnormal roll change rate, reduces quality defects such as dents and scratches on the surface of the strip 3, improves product quality and rolling mill capacity, and reduces production costs.
[0046] In this embodiment, the area where the lower injection manifold 2 rises and picks up the strip 3 to contact the strip 3 is the area that the strip 3 needs to be cut off, and will not cause scratches to the production and processing of the strip 3.
[0047] In this embodiment, the area where the upper spray manifold 1 descends and presses the protective pad 5 to contact the strip steel 3 is the area that the strip steel 3 needs to be cut off, and will not cause scratches to the production and processing of the strip steel 3.
[0048] In this embodiment, the upper surface of the strip 3 is an area that is easily scratched, so a protective pad 5 is only set between the upper work roll 4 and the strip 3. If the overall processing quality of the strip 3 is higher, a protective pad 5 can also be set between the lower surface of the strip 3 and the work roll 4.
[0049] Please see Figure 8 ;
[0050] The second aspect of this embodiment provides a protective pad 5 used in a roll changing method for a reversible rolling mill. The protective pad 5 includes: a main pad body 51 for placing on the strip 3; side ears 52, which are L-shaped and connected to the main pad body 51, and used to wrap the work roll 4 during use; and a handle 53 disposed on the main pad body 51 for easy removal of the protective pad 5. By wrapping the work roll 4 with the side ears 52 of the protective pad 5, the work roll 4 is protected by the side ears 52 and the protective pad 5 during the roll changing process, effectively reducing scratches on the strip 3 during the roll changing process of the reversible rolling mill, reducing the abnormal roll changing rate, reducing quality defects such as dents and scratches on the surface of the strip 3, improving product quality and rolling mill capacity, and reducing production costs.
[0051] In this embodiment, the main pad 51 is made of rubber, which provides good protection. Specifically, the main pad 51 is made of PTFE rubber.
[0052] As can be seen from the above technical solution, this application has at least the following advantages and positive effects:
[0053] This application discloses a roll changing method for a reversible rolling mill. By placing a protective pad on the upper surface of the strip and wrapping the work roll with the side lugs of the protective pad, the work roll is protected by the side lugs and the protective pad during the roll changing process. This effectively reduces scratches on the strip during the roll changing process of the reversible rolling mill, reduces the abnormal roll changing rate, reduces quality defects such as dents and scratches on the strip surface, improves product quality and rolling mill capacity, and reduces production costs.
[0054] The protective pad described in this application wraps around the work roll with its side lugs, ensuring that the work roll is protected by the side lugs and the protective pad during the replacement process. This effectively reduces scratches on the strip during roll changing in reversible rolling mills, reduces abnormal roll changing rates, lowers quality defects such as dents and scratches on the strip surface, improves product quality and rolling mill capacity, and reduces production costs.
[0055] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.
Claims
1. A roll changing method for a reversible rolling mill, characterized in that, Includes the following steps: Adjust the positions of the upper and lower injection manifolds of the reversible rolling mill; The lower injection manifold is driven to rise and lift the strip, allowing the work roll below the strip to be replaced. The lower injection manifold is then reset. Place a protective pad on the upper surface of the strip, control the upper spray manifold to descend and press the protective pad, and use the side ears of the protective pad to wrap the work roll above the strip; Replace the work roll above the strip, and then reset the upper injection manifold; The reversible rolling mill is driven to carry out the protective pad, completing the roll change.
2. The roll changing method for a reversible rolling mill according to claim 1, characterized in that, The specific steps for adjusting the positions of the upper and lower injection manifolds of the reversible rolling mill are as follows: through the control system of the reversible rolling mill, the upper injection manifold is adjusted to the upper limit position, and the lower injection manifold is adjusted to the lower limit position.
3. The roll changing method for a reversible rolling mill according to claim 1, characterized in that, The specific steps for replacing the work roll below the strip are as follows: use a roll changing trolley to remove the work roll that needs to be replaced, and then use the roll changing trolley to load the new work roll.
4. The roll changing method for a reversible rolling mill according to claim 3, characterized in that, During the process of loading a new work roll using a roll changing trolley, the work roll needs to be kept tilted, with the front lower than the back, to ensure that the upper end of the work roll does not scrape the strip and the lower end of the work roll does not scrape the rolling mill during loading.
5. The roll changing method for a reversible rolling mill according to claim 1, characterized in that, The specific steps for placing the protective pad on the upper surface of the strip are as follows: place the protective pad in the gap between the strip and the upper spray manifold, the protective pad needs to completely cover the surface of the strip, and confirm that there are no debris on the surface of the protective pad.
6. The roll changing method for a reversible rolling mill according to claim 1, characterized in that, The specific steps for replacing the work roll above the strip are as follows: use a roll changing trolley to remove the work roll to be replaced from the side lug of the protective pad, and then use the roll changing trolley to load the new work roll into the reversible rolling mill while it is wrapped in the side lug.
7. The roll changing method for a reversible rolling mill according to claim 6, characterized in that, During the process of loading a new work roll using a roll-changing trolley, the work roll needs to be kept tilted, with the front lower than the back, to ensure that the lower end of the work roll does not scrape the strip and the upper end of the work roll does not scrape the rolling mill during loading.
8. The roll changing method for a reversible rolling mill according to claim 1, characterized in that, The specific steps for the reversible rolling mill to carry out the protective pad are as follows: drive the core of the rolling mill to rotate, carry the protective pad out of the work roll, then shut down the rolling mill and remove the protective pad.
9. A protective pad used in a roll changing method for a reversible rolling mill according to any one of claims 1 to 8, characterized in that, The protective pad includes: Main pad, used to be placed on the strip steel; Side ears, connected to the main pad body, are used to wrap the work roller during use; The handle is located on the main body of the pad.
10. A protective pad according to claim 9, characterized in that, The main pad is made of rubber.
Citation Information
Patent Citations
Hook head device of working roller changing hauling mechanism
CN107225153A
Integrated emulsion spray with sweep prevent twining baffle
CN206316143U