Rolling mill coil auxiliary support double conical sleeve

Abstract

This utility model provides a double-conical sleeve for auxiliary support of rolling mill coils, relating to the technical field of rolling mill accessories. It includes a sleeve and a fixing ring. The sleeve comprises a long cone and a short cone, forming an asymmetrical double-conical surface. A slightly convex separation ring is provided between the long and short cones. Both the long and short cones have notches. The fixing ring is fixed inside the sleeve by a connecting block. The long cone forms a guiding channel, allowing for a certain axial deviation during coil loading without repeated alignment adjustments. Compared to traditional cylindrical shaft-end loading, this significantly reduces loading time and improves rolling mill production efficiency. The short cone, through its small cone angle, converts the coiling tension into radial pressure, ensuring a tight fit between the coil's inner hole and the short cone, forming a locking mechanism. This completely prevents coil slippage and deviation during winding, ensuring the quality of copper strip products.

Description

Technical Field

[0001] This utility model relates to the technical field of rolling mill accessories, specifically to a double-conical sleeve for auxiliary support of rolling mill coils. Background Technology

[0002] In copper processing, the mill coil is a crucial component for winding the coil. Traditional mill coils typically have cylindrical end faces, a structure with significant drawbacks in practical applications. According to data on cylindrical end defects recorded in the *Rolling Mill Equipment Design Manual*, the cylindrical end makes precise coil alignment during installation difficult, resulting in time-consuming and labor-intensive loading processes that severely impact production efficiency. Furthermore, the improper contact between the cylindrical surface and the coil's inner bore leads to slippage and misalignment during winding, affecting product quality. In addition, the traditional structure presents numerous inconveniences during coil unloading, often requiring substantial manpower and resources, thus increasing production costs.

[0003] Therefore, this utility model provides a double-conical sleeve for auxiliary support of rolling mill coils. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies and provide a double-conical sleeve for auxiliary support of rolling mill coils.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a double-conical sleeve for auxiliary support of rolling mill coils, comprising a sleeve and a fixing ring, wherein the sleeve comprises a long cone and a short cone to form an asymmetrical double conical surface, a micro-convex separation ring is provided between the long cone and the short cone, and notches are provided on both the long cone and the short cone, and the fixing ring is fixed to the inside of the sleeve by a connecting block.

[0006] In a preferred embodiment, a reinforcing block is installed on the side of the connecting block, and both the connecting block and the reinforcing block have through holes, and the reinforcing block is fixed to the connecting block by bolts passing through the through holes.

[0007] The connecting block bears the connection force between the sleeve and the fixed ring, and the reinforcing block can strengthen the stress area of ​​the connecting block. With the bolt fixing, there is no deformation or loosening under the coiling tension (≤50kN), which solves the technical problem of insufficient connection strength and easy damage in traditional structures. The through hole can reduce the weight of the connecting block and the reinforcing block, and reduce the load on the rolling mill coil. At the same time, the through hole can serve as a positioning reference and chip removal channel during processing, improving the processing efficiency of the parts and reducing the processing cost. The bolt fixing method through the through hole facilitates the disassembly and maintenance of the connecting block and the reinforcing block.

[0008] In a preferred embodiment, the back tilt angle δ of the micro-convex separation ring is 5-8°, the surface hardness is HV≥800, and the surface is treated with a combination of vacuum quenching and low-temperature tempering.

[0009] A 5-8° back tilt angle can guide the pry bar force applied by the operator into a radial separation force, further reducing the force required for separation and making material unloading easier. Compared with a separation ring without a back tilt angle, the separation force is reduced. The surface hardness HV≥800 and is treated with a composite process, which can withstand the local impact load of the pry bar and the friction of the material roll during unloading, avoiding wear and deformation of the separation ring. Compared with traditional untreated separation rings, the service life is extended.

[0010] In a preferred embodiment, the number of notches on the long and short cones is the same as the number of mill jaws and is evenly distributed on the sleeve surface. The wrap angle of the notches is θ, which is 30-45°, and the depth H is ≥0.2D, where D is the outer diameter of the sleeve. The bottom of the notch is provided with a radial clearance surface, which is inclined at an angle ε of 10-15° with the axis of the sleeve, and the width of the radial clearance surface is W, which is 15-25mm.

[0011] The notch is adapted to the mill jaws, ensuring that the jaws can be fully embedded in the notch. No disassembly or adjustment of the jaws is required during loading and unloading, further shortening loading and unloading time and improving efficiency. The radial clearance surface can form a sufficient gap during the thermal expansion of the mill, fully accommodating the thermal expansion of the sleeve, avoiding squeezing between the sleeve and the jaws, preventing jaw deformation or sleeve jamming, and ensuring continuous and stable operation of the mill. The depth design of H≥0.2D meets the jaw embedding requirements while avoiding insufficient local strength of the sleeve due to excessive notch depth. Combined with the transition effect of the clearance surface, it ensures that there is no stress concentration in the notch area during coiling, and does not affect the overall load-bearing capacity of the sleeve.

[0012] In a preferred embodiment, the ratio of the length of the long cone to the length of the short cone is 1.5-2.5:1, the cone angle α of the long cone is 20-35°, and the cone angle β of the short cone is 3-5°.

[0013] A length ratio of 1.5-2.5:1 ensures the guiding stroke of the long cone, and the large cone angle of 20-35° further expands the tolerance for feeding deviation. Even with low precision manual feeding, it can be smoothly inserted, completely solving the problem of difficult alignment of traditional cylindrical shaft ends. The small cone angle of 3-5° can convert the winding tension into radial pressure, and the short cone can cover the effective locking area of ​​the inner hole of the coil, ensuring that the coil does not slip or deviate during winding. The range of length ratio and cone angle can be adjusted according to different rolling mill models and coil specifications, improving the versatility of the sleeve and reducing the adaptation cost of multi-specification equipment.

[0014] In a preferred embodiment, the ratio of the number of connecting blocks to reinforcing blocks is 5:3.

[0015] Five connecting blocks are evenly distributed along the circumference, which can evenly distribute the winding tension and avoid local stress concentration; three reinforcing blocks strengthen the high-stress areas of the sleeve (such as near the notch), solving the problem of insufficient local strength despite the even distribution of connecting blocks, and ensuring the overall strength and stability during connection; the 5:3 ratio can reduce the number of reinforcing blocks while meeting the strength requirements, which reduces material costs compared to the traditional 1:1 ratio connection, without affecting the support performance.

[0016] This utility model provides a double-conical sleeve for auxiliary support of rolling mill coils. It has the following beneficial effects:

[0017] The long cone forms a guiding channel, allowing for a certain axial deviation during coil loading without repeated alignment adjustments. Compared to traditional cylindrical shaft-end loading, this significantly reduces loading time and improves steel rolling production efficiency. The short cone converts coiling tension into radial pressure through a small cone angle, ensuring a tight fit between the coil's inner hole and the short cone, forming a lock and completely preventing slippage and deviation during coiling, thus guaranteeing the quality of copper strip products. The micro-convex separation ring reduces the contact area between the sleeve and the coil's inner hole, lowering separation friction. Combined with the guiding effect of the double cone surface, it eliminates the need for brute force during unloading, allowing for single-person operation, reducing manpower and production costs. The fixing ring is fixed to the sleeve via a connecting block, forming a support structure that evenly transmits coiling tension to the mill coil shaft, preventing sleeve deformation and ensuring stable and reliable auxiliary support function. Attached Figure Description

[0018] Figure 1 A three-dimensional structural diagram of the double-conical sleeve for auxiliary support of rolling mill coils provided by this utility model;

[0019] Figure 2 A schematic diagram of the planar structure of the double-conical sleeve for auxiliary support of the rolling mill coil provided by this utility model;

[0020] Figure 3 A side view of the double-conical sleeve for auxiliary support of the rolling mill coil provided by this utility model.

[0021] Legend:

[0022] 1. Sleeve; 11. Long cone; 12. Short cone; 13. Micro-convex separation ring;

[0023] 2. Fixing ring; 3. Connecting block; 4. Reinforcing block; 5. Through hole; 6. Notch. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] like Figures 1-3 As shown, this embodiment provides a technical solution: a double-conical sleeve for auxiliary support of the rolling mill coil, including a sleeve 1. The sleeve 1 adopts an asymmetric double-conical structure composed of a long cone 11 and a short cone 12, and has no threaded groove. The long cone 11 and the short cone 12 are connected by a micro-convex separation ring 13. The length L1 of the sleeve 1 is 100mm, and the length L2 of the short cone 12 is 50mm, with a specific ratio of L1:L2=2:1. The long cone 11 is used for feeding guidance, and the short cone 12 is used for winding and locking. The cone angle α of the long cone 11 is 30°. The large cone angle design allows for an axial deviation of ±5mm when the coil is fed, reducing the difficulty of alignment. The cone angle β of the short cone 12 is 4°. The small cone angle can generate a radial pressure of 12MPa during winding, tightly locking the coil and preventing slippage. The micro-convex separation ring 13 is located between the long cone 11 and the short cone 12. The ring is 15mm wide and the back tilt angle δ is 6°. The surface of the micro-convex separation ring 13 is treated with a composite process of vacuum quenching (holding at 950℃ for 2 hours) and low temperature tempering (holding at 180℃ for 4 hours), and the surface hardness reaches HV900, which makes it wear-resistant and impact-resistant. This reduces the contact area between the sleeve 1 and the inner hole of the coil when the coil is unloaded, reduces the separation friction, and allows the sleeve 1 to be easily disassembled with a pry bar, avoiding the damage to the components caused by the brute force required by the traditional structure. Both the long cone 11 and the short cone 12 are provided with notches 6 corresponding to the jaws. The notches 6 are evenly distributed on the circumference of the sleeve 1. The notch wrap angle θ is 40° and the depth H is 70mm (the outer diameter D of the sleeve 1 is 350mm and H is 0.2D). This ensures that the jaws can be completely embedded in the notches 6 without affecting the loading and unloading of the coil. The bottom of the notch 6 is provided with a radial clearance surface. The radial clearance surface is inclined at an angle ε of 12° with the axis of the sleeve 1 and the width W of the clearance surface is 20mm. This allows a gap to be formed when the rolling mill expands thermally, avoiding rigid interference between the sleeve 1 and the jaws. The fixing ring 2 is fixed to the inside of the sleeve 1 by the connecting block 3. The connecting block 3 is equipped with a reinforcing block 4 on its side. There are 5 connecting blocks 3 and 3 reinforcing blocks 4. The 5 connecting blocks 3 are fixed in a ring array on the outer wall of the fixing ring 2 and the inner wall of the sleeve 1. Both the connecting block 3 and the reinforcing block 4 are provided with through holes 5. The reinforcing block 4 is fixed to the connecting block 3 by bolts passing through the through holes 5. The bolt preload torque is 80 N·m to ensure the connection strength. The through holes 5 are not only used for bolt assembly, but also reduce the weight of the parts and facilitate positioning and chip removal during processing.

[0026] Working principle:

[0027] like Figure 1-3 As shown: The auxiliary support journal of the rolling mill coil first completes the assembly of the fixing ring 2. The fixing ring is connected to the sleeve 1 through the connecting blocks 3 of 5 ring arrays. The operator aligns the coil with the end of the long cone 11 of the sleeve 1. The long cone 11 has a large cone angle of 30°. Its cone surface can form a flared guide channel, allowing the coil to have an axial deviation of ±5mm without repeated adjustment of alignment.

[0028] Under its own weight and a slight thrust, the coil slides along the conical surface of the long cone 11 toward the short cone 12. The long cone provides ample guiding stroke for the coil, preventing jamming during insertion. Simultaneously, the threadless design of the sleeve eliminates the risk of threads scraping the inner hole of the coil, ensuring its integrity. The notches 6 on the long cone 11 and short cone 12 precisely correspond to the mill jaws. When the coil is inserted, the jaws can fully engage with the notches, preventing interference between the jaws and the sleeve. Loading can be completed without disassembling or adjusting the jaws, further shortening loading time.

[0029] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It will be apparent to those skilled in the art that this utility model is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and thus all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this utility model. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0030] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A double-conical sleeve for auxiliary support of a rolling mill coil, comprising a sleeve (1) and a retaining ring (2), characterized in that, The sleeve (1) includes a long cone (11) and a short cone (12) to form an asymmetrical double cone surface. A micro-convex separation ring (13) is provided between the long cone (11) and the short cone (12). Both the long cone (11) and the short cone (12) are provided with notches (6). The fixing ring (2) is fixed inside the sleeve (1) by a connecting block (3).

2. The double-conical sleeve for auxiliary support of rolling mill coils according to claim 1, characterized in that: A reinforcing block (4) is installed on the side of the connecting block (3). Both the connecting block (3) and the reinforcing block (4) have through holes (5), and the reinforcing block (4) is fixed to the connecting block (3) by bolts through the through holes (5).

3. The double-conical sleeve for auxiliary support of rolling mill coils according to claim 1, characterized in that: The back tilt angle δ of the micro-convex separation ring (13) is 5-8°, the surface hardness is HV≥800, and the surface is treated by a combination of vacuum quenching and low temperature tempering.

4. The double-conical sleeve for auxiliary support of rolling mill coils according to claim 1, characterized in that: The number of notches (6) on the long cone (11) and short cone (12) is the same as the number of mill jaws and is evenly distributed on the surface of the sleeve (1). The wrap angle θ of the notch (6) is 30-45° and the depth H≥0.2D, where D is the outer diameter of the sleeve (1). The bottom of the notch (6) is provided with a radial clearance surface. The radial clearance surface is inclined at an angle ε of 10-15° with the axis of the sleeve (1), and the width of the radial clearance surface is W of 15-25mm.

5. The double-conical sleeve for auxiliary support of rolling mill coils according to claim 1, characterized in that: The ratio of the length of the long cone (11) to the length of the short cone (12) is 1.5-2.5:1, the cone angle α of the long cone (11) is 20-35°, and the cone angle β of the short cone (12) is 3-5°.

6. The double-conical sleeve for auxiliary support of rolling mill coils according to claim 2, characterized in that: The ratio of the number of connecting blocks (3) to reinforcing blocks (4) is 5:3.

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