Method for replacing rubber tiles of 825 rolling mill

Abstract

A method for replacing bakelite shingles on an 825 rolling mill belongs to the field of steel rolling technology. This invention solves the problem that current methods for replacing bakelite shingles on an 825 rolling mill are complex, requiring more than two hours and reducing production efficiency. The invention involves machining two through holes in the upper shingle sheath, inserting lifting screws into these holes. The ends of the lifting screws protrude from both sides of the upper shingle sheath. A short steel wire rope is connected to both ends of each lifting screw, passing over a lifting and lowering device to lift the upper shingle sheath. The upper bakelite shingle attached to the sheath is then manually removed and replaced with a new one. Similarly, a long steel wire rope is connected to both ends of each lifting screw, passing under the roller diameter to lift the roller. The roller is then manually lifted, and the lower bakelite shingle attached to the lower shingle sheath is then manually removed and replaced with a new one. This method for replacing bakelite shingles on an 825 rolling mill is simple to operate and improves work efficiency.

Description

Technical Field

[0001] This invention belongs to the field of steel rolling technology, specifically a method for replacing bakelite tiles on an 825 rolling mill. Background Technology

[0002] The 825 rolling mill is a type of billet mill (2) in a steel rolling production line. This two-roll mill is primarily used to roll and deform square continuous casting billets, round continuous casting billets, and ingots through perforated rolls to obtain square rolled billets of different sizes. These billets are then further rolled into bars of different diameters using a continuous rolling mill. The 825 rolling mill is widely used in the rolling industry. This equipment features reversible rolling capabilities, offering greater flexibility in rolling different ingot shapes and enabling free rolling.

[0003] The 825 rolling mill mainly consists of a main motor, transmission device, frame, rolls, pressing motor, and steel-turning mechanism. The roll diameter is installed within a mortise and tenon joint, with bakelite shingles installed between the roll diameter and the mortise and tenon joint. Bakeryite shingles are a consumable material, primarily made from wood chips and high-temperature resistant adhesive through high-temperature pressing. Their main function is to prevent wear and tear from friction between the roll diameter and the mortise and tenon joint. They need to be replaced when they wear down to a certain thickness.

[0004] The initial replacement of bakelite shingles involves pulling out the entire roller assembly, opening the fixing pins on the connecting rod, removing the upper shingle base, removing the upper bakelite shingles, replacing them with new bakelite shingles, removing the rollers, removing the lower bakelite shingles, reinstalling the rollers, installing the upper shingle base, and then pushing the entire roller into the frame. The entire operation takes about 2 hours, reducing production efficiency.

[0005] Therefore, this application proposes a simplified replacement procedure for replacing bakelite tiles on an 825 rolling mill, which improves production efficiency. Summary of the Invention

[0006] The purpose of this invention is to solve the problem of complex procedures and a process that takes more than two hours when replacing bakelite sheets on the 825 rolling mill, thus reducing production efficiency. A brief overview of the invention is provided below to offer a basic understanding of certain aspects of it. It should be understood that this overview is not an exhaustive summary of the invention. It is not intended to identify key or essential parts of the invention, nor is it intended to limit the scope of the invention.

[0007] The technical solution of the present invention:

[0008] A method for replacing bakelite shingles on an 825 rolling mill includes a lifting and pressing device, a rolling mill roll, a lower shingle liner, and an upper shingle liner. The lower and upper shingles are mounted on the rolling mill roll. A suspension rod passes sequentially through the upper shingle liner, the rolling mill roll, and the lower shingle liner to fix the upper and lower shingles onto the rolling mill roll. The suspension rod is connected to a fixing pin. An upper bakelite shingle is positioned between the upper shingle liner and the rolling mill roll diameter, and a lower bakelite shingle is positioned between the rolling mill roll diameter and the lower shingle liner. A lifting and pressing device is positioned above the upper shingle liner and is installed on the upper wall of the rolling mill inner cavity. The method includes the following steps:

[0009] S1: Machin two through holes on the upper tile body, lower the lifting and pressing device to the lowest point, and remove the fixing pin of the lower half of the hanging rod;

[0010] S2: Insert lifting screws into the two through holes on the upper tile body respectively, with both ends of the lifting screws protruding from both sides of the upper tile body;

[0011] S3: Connect a short steel wire rope to both ends of each lifting screw, and arrange the short steel wire rope around the top of the lifting and lowering device;

[0012] S4: Raise the lifting and pressing device to lift the upper tile. When the distance between the upper tile and the roller diameter is greater than 500mm, manually remove the upper adhesive wood tile attached to the upper tile and replace it with a new upper adhesive wood tile.

[0013] S5: Lower the lifting and pressing device, remove the short steel wire rope from each lifting screw, and connect a long steel wire rope to both ends of each lifting screw. The long steel wire rope is arranged around the roll diameter of the roller.

[0014] S6: Raise the lifting and pressing device to lift the roller. When the distance between the roller diameter and the lower tile body is greater than 500mm, manually remove the lower tile attached to the lower tile body and replace it with a new lower tile.

[0015] S7: Lower the lifting and pressing device, insert the fixing pin of the lower half of the hoisting rod that fixes the upper and lower tile tires into the hoisting rod, pull out the hoisting screw of the upper tile tire, remove the long steel wire rope, and complete the replacement.

[0016] Furthermore, step S1 specifically involves setting the through hole 30mm below the upper end face of the upper tile, with two through holes arranged symmetrically, and the diameter of the through hole being φ20mm.

[0017] Furthermore, step S2 specifically involves: the thickness of the upper tile is 500mm, the length of the lifting screw is between 550mm and 600mm, and the diameter of the lifting screw is φ19mm.

[0018] Furthermore, the length of the short steel wire rope is between 800mm and 1000mm, and the length of the long steel wire rope is between 2000mm and 2200mm.

[0019] The present invention has the following beneficial effects:

[0020] The present invention discloses a method for replacing phenolic resin tiles on an 825 rolling mill. This method allows for replacement of the upper and lower phenolic resin tiles without the 825 rolling mill roll assembly being completely withdrawn offline. By drilling through holes on both sides above the upper tile blank and inserting lifting screws, the upper tile blank and the rolling mill rolls are lifted in stages using steel wire ropes of different lengths. This method allows for the replacement of both upper and lower phenolic resin tiles more simply and quickly than previous methods, reducing the replacement time to approximately 30 minutes and improving work efficiency. Attached Figure Description

[0021] Figure 1 This is a schematic diagram showing the relationship between the rolling mill rolls and the upper and lower bearing plates;

[0022] Figure 2 This is a front view of the upper and lower steel sheet and the rolling mill.

[0023] Figure 3 This is a diagram illustrating the replacement of the shingles with bakelite shingles;

[0024] Figure 4 This is a diagram illustrating the replacement of the bakelite shingles.

[0025] In the diagram: 1-Lifting and pressing device, 2-Roller, 3-Hanging rod, 4-Fixing pin, 5-Lower tile, 6-Lower PVC shingle, 7-Upper PVC shingle, 8-Upper tile, 9-Through hole, 10-Short steel wire rope, 11-Lifting screw, 12-Long steel wire rope. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention is described below with reference to specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are merely exemplary and not intended to limit the scope of the invention. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of the present invention.

[0027] The connections mentioned in this invention are divided into fixed connections and detachable connections. Fixed connections (i.e., non-detachable connections) include, but are not limited to, conventional fixed connection methods such as folded connections, riveted connections, adhesive connections, and welded connections. Detachable connections include, but are not limited to, conventional disassembly methods such as threaded connections, snap-fit ​​connections, pin connections, and hinged connections. When a specific connection method is not explicitly defined, it is assumed that at least one existing connection method can always be found to achieve the function, and those skilled in the art can choose according to their needs. For example, a welded connection can be chosen for fixed connections, and a hinged connection can be chosen for detachable connections.

[0028] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0029] Example 1, combined with Figures 1-4 This embodiment describes a method for replacing phenolic resin tiles on an 825 rolling mill. The method includes a lifting and pressing device 1, a rolling mill roll 2, a lower tile liner 5, and an upper tile liner 8. The rolling mill roll 2 has the lower tile liner 5 and the upper tile liner 8. A suspension rod 3 passes sequentially through the upper tile liner 8, the rolling mill roll 2, and the lower tile liner 5 to fix the upper tile liner 8 and the lower tile liner 5 to the rolling mill roll 2. The suspension rod 3 is connected to a fixing pin 4. An upper phenolic resin tile 7 is placed between the upper tile liner 8 and the diameter of the rolling mill roll 2. A lower phenolic resin tile 6 is placed between the diameter of the rolling mill roll 2 and the lower tile liner 5. The lifting and pressing device 1 is located above the upper tile liner 8 and is installed on the upper wall of the rolling mill inner cavity.

[0030] S1: Machin two through holes 9 on the upper tile 8. The two through holes 9 are symmetrically arranged on the upper tile 8. The position of the through holes 9 is 30mm below the upper end face of the upper tile 8. The diameter of the through holes 9 is φ20mm. Lower the lifting and pressing device 1 to the lowest point and remove the fixing pin 4 of the lower half of the hanging rod 3.

[0031] S2: Insert lifting screws 11 into the two through holes 9 on the upper tile 8 respectively. The two ends of the lifting screws 11 protrude from both sides of the upper tile 8. The thickness of the upper tile 8 is 500mm, and the length of the lifting screws 11 is 550mm to 600mm. When the lifting screws 11 are inserted into the upper tile 8 through the through holes 9, the two ends of the lifting screws 11 protrude more than 25mm from both sides of the upper tile 8, which facilitates the connection of the wire rope. The diameter of the lifting screws 11 is φ19mm.

[0032] S3: Connect a short steel wire rope 10 to both ends of each lifting screw 11. The short steel wire rope 10 is arranged to pass over the top of the lifting and lowering device 1.

[0033] S4: Raise the lifting and pressing device 1 to lift the upper tile 8. When the distance between the upper tile 8 and the roller diameter of the roller 2 is greater than 500mm, manually remove the upper glued wood tile 7 attached to the upper tile 8 and replace it with a new upper glued wood tile 7.

[0034] S5: Lower the lifting and pressing device 1, remove the short steel wire rope 10 from each lifting screw 11, and connect a long steel wire rope 12 to both ends of each lifting screw 11. The long steel wire rope 12 is arranged around the roll diameter of the roll 2.

[0035] S6: Raise the lifting and pressing device 1 to lift the roller 2. When the distance between the roller diameter of the roller 2 and the lower tile 5 is greater than 500mm, manually remove the lower veneer 6 attached to the lower tile 5 and replace it with a new lower veneer 6.

[0036] S7: Lower the lifting and pressing device 1, insert the fixing pin 4 of the lower half of the lifting rod 3 that fixes the upper tile 8 and the lower tile 5 into the lifting rod 3, pull out the lifting screw 11 of the upper tile 8, remove the long steel wire rope 12, and complete the replacement.

[0037] The length of the short steel wire rope 10 is between 800mm and 1000mm, and the length of the long steel wire rope 12 is between 2000mm and 2200mm.

[0038] This embodiment is merely an exemplary illustration of the present invention and does not limit its scope of protection. Those skilled in the art can make partial changes to it, as long as they do not exceed the spirit and essence of the present invention, they are all within the scope of protection of the present invention.

Claims

1. A method for replacing bakelite tiles on an 825 rolling mill, comprising a lifting and pressing device (1), a rolling mill roll (2), a lower tile blank (5), and an upper tile blank (8), wherein the lower tile blank (5) and the upper tile blank (8) are provided on the rolling mill roll (2), a hanging rod (3) passes through the upper tile blank (8), the rolling mill roll (2), and the lower tile blank (5) in sequence to fix the upper tile blank (8) and the lower tile blank (5) on the rolling mill roll (2), the hanging rod (3) is connected to the fixing pin (4), an upper bakelite tile (7) is provided between the upper tile blank (8) and the rolling mill roll (2), a lower bakelite tile (6) is provided between the rolling mill roll (2) and the lower tile blank (5), and a lifting and pressing device (1) is provided above the upper tile blank (8), the lifting and pressing device (1) is installed on the upper wall of the inner cavity of the rolling mill; characterized in that, Includes the following steps: S1: Machin two through holes (9) on the upper tile (8), lower the lifting and pressing device (1) to the lowest point, and remove the fixing pin (4) of the lower half of the hanging rod (3); S2: Insert lifting screws (11) into the two through holes (9) on the upper tile (8) respectively, with the two ends of the lifting screws (11) protruding from both sides of the upper tile (8); S3: Connect a short steel wire rope (10) to both ends of each lifting screw (11), and arrange the short steel wire rope (10) around the top of the lifting and pressing device (1); S4: Raise the lifting and pressing device (1) to lift the upper tile (8). When the distance between the upper tile (8) and the roller diameter of the roller (2) is greater than 500mm, manually remove the upper glued wood tile (7) attached to the upper tile (8) and replace it with a new upper glued wood tile (7). S5: Lower the lifting and pressing device (1), remove the short steel wire rope (10) from each lifting screw (11), and connect a long steel wire rope (12) to both ends of each lifting screw (11). The long steel wire rope (12) is arranged below the roller diameter of the roller (2). S6: Raise the lifting and pressing device (1) to lift the roller (2). When the distance between the roller diameter of the roller (2) and the lower tile (5) is greater than 500mm, manually remove the lower veneer (6) attached to the lower tile (5) and replace it with a new lower veneer (6). S7: Lower the lifting and pressing device (1), insert the fixing pin (4) of the lower half of the hoisting rod (3) that fixes the upper tile (8) and the lower tile (5) into the hoisting rod (3), pull out the hoisting screw (11) of the upper tile (8), remove the long steel wire rope (12), and complete the replacement.

2. The method for replacing bakelite shingles on an 825 rolling mill according to claim 1, characterized in that, The specific steps of step S1 are as follows: the through hole (9) is located 30mm below the upper end face of the upper tile (8), the two through holes (9) are arranged symmetrically, and the diameter of the through hole (9) is φ20mm.

3. The method for replacing bakelite shingles on an 825 rolling mill according to claim 2, characterized in that, The specific steps of step S2 are as follows: the thickness of the upper tile (8) is 500mm, the length of the lifting screw (11) is between 550mm and 600mm, and the diameter of the lifting screw (11) is φ19mm.

4. The method for replacing bakelite shingles on an 825 rolling mill according to claim 3, characterized in that: The length of the short steel wire rope (10) is between 800mm and 1000mm, and the length of the long steel wire rope (12) is between 2000mm and 2200mm.

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