A four-row cylindrical roller bearing for a support roll of a rolling mill

Abstract

The utility model provides a kind of mill support roll four-column cylindrical roller bearing, including mill support roll, outer ring, cylindrical roller and retainer;Outer ring is set between mill support roll and retainer;Retainer includes middle beam and several pocket beam;Pocket beam inner diameter surface is equipped with lug, lug is ladder structure, the big bottom surface of lug is connected with pocket beam inner diameter surface;Two surfaces set on lug close to pocket are first inclined plane and second inclined plane, first inclined plane and second inclined plane are oppositely arranged;The junction of first inclined plane and pocket beam forms first lock point, the junction of second inclined plane and pocket beam forms second lock point, adjacent first lock point and second lock point constitute the lock structure of cylindrical roller, lock structure and cylindrical roller interference fit;Integral outer ring and free inner ring design simplifies installation step, reduces the complexity of interference fit adjustment, significantly improves bearing replacement efficiency and production efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of rolling bearing technology, and in particular to a four-row cylindrical roller bearing for rolling mill support rolls. Background Technology

[0002] Rolling mill support roll bearings are critical components in rolling mill equipment, and their performance directly affects the mill's operating efficiency and service life. Traditional rolling mill support roll bearings typically employ a two-outer-ring design with an inner ring structure. While this design can meet basic load-bearing requirements, it presents several problems in practical applications: the two-outer-ring and inner-ring design results in a large radial and axial space requirement, making the overall mill structure less compact and increasing manufacturing costs and installation difficulty; the need to install the inner ring, requiring interference fit to adjust clearance, complicates the installation process, is time-consuming, and impacts production efficiency; traditional cages rely on notches on the outer rings to accommodate the rollers, and for multi-row (e.g., four-row) bearings, some rollers (e.g., rows II and III) cannot be installed through these notches, leading to assembly difficulties. Furthermore, the cage's weight is significant, increasing manufacturing costs and operating load; traditional bearings are less efficient in lubrication and maintenance, especially under high load conditions, where insufficient lubrication can accelerate wear and shorten bearing life. Utility Model Content

[0003] In view of the above problems, the purpose of this application is to provide a four-row cylindrical roller bearing for rolling mill support rolls. The integral outer ring and inner ring-free design simplifies the installation steps, reduces the complexity of interference fit adjustment, and significantly improves bearing replacement efficiency and production efficiency.

[0004] To achieve some or all of the above objectives or other objectives, this application provides the following technical solution: It includes a mill support roll, an outer ring, cylindrical rollers, and a cage; the outer ring is provided on the outer circumferential surface of the mill support roll, and two cages are provided between the outer ring and the mill support roll; the cage includes a central beam and retaining beams extending from the central beam to both sides, and the retaining beams have holes drilled from their end faces toward the central beam to provide pockets for accommodating cylindrical rollers, forming a plurality of pocket beams after drilling; the inner diameter surface of the pocket beams has protrusions, which are trapezoidal structures, with the large bottom surface of the protrusions connected to the inner diameter surface of the pocket beams; two surfaces on the protrusions near the pockets are a first inclined surface and a second inclined surface, which are arranged opposite to each other; the connection between the first inclined surface and the pocket beams forms a first locking point, and the connection between the second inclined surface and the pocket beams forms a second locking point, with adjacent first and second locking points constituting a locking structure for the cylindrical rollers, the locking structure being an interference fit with the cylindrical rollers.

[0005] Furthermore, the axial length of the pocket beam is greater than the axial length of the protrusion, and the protrusion is located on the side of the pocket beam away from the center beam.

[0006] Furthermore, the perforated beams on both sides of the central beam are staggered.

[0007] Furthermore, two adjacent protrusions constitute a guiding structure for the cylindrical roller.

[0008] Furthermore, the first locking point is in contact with the cylindrical roller line, and the second locking point is in contact with the cylindrical roller line.

[0009] Furthermore, the pocket is a straight pocket.

[0010] Furthermore, the axial length of the pocket beam is less than the height of the cylindrical roller.

[0011] Furthermore, the inner diameter of the pocket beam is sloped at the connection with the middle beam, and the outer diameter of the pocket beam is sloped at the connection with the middle beam; the radial width of the pocket beam is smaller than the radial width of the middle beam.

[0012] Furthermore, four raceways are arranged side by side on the inner circumference of the outer ring, and a radially penetrating oil hole is provided between two adjacent raceways.

[0013] Furthermore, a central retaining edge is formed between two adjacent raceways on the outer ring, and two identical external retaining edges are formed on both sides of the outer ring; the width of the external retaining edge is less than the width of the central retaining edge, which is less than 2 × the width of the external retaining edge.

[0014] Compared with existing technologies, the beneficial effects of this utility model are as follows: The integral outer ring design reduces radial and axial space occupation compared to the traditional two-outer-ring structure, making the overall structure of the rolling mill more compact and reducing manufacturing costs and installation difficulty. No inner ring installation is required; the installation clearance is directly guaranteed by the shaft diameter and bearing radius, simplifying the installation and commissioning process and improving production efficiency. The cage is designed with a self-locking locking structure, using a guiding structure formed by adjacent protrusions to press the rollers into the pockets, preventing roller scratches and roller detachment ("loosening"), thus improving assembly reliability. The reduced cage weight lowers the bearing's operating load and manufacturing cost, while also solving the problem of difficult assembly of multi-row rollers. The integral outer ring and inner ring-free design simplify the installation steps, reduce the complexity of interference fit adjustments, and significantly improve bearing replacement efficiency and production efficiency. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the cage structure;

[0017] Figure 3 This is a partially enlarged schematic diagram of the cage;

[0018] Figure 4 This is a top view of the cage;

[0019] Figure 5 for Figure 4 AA view;

[0020] Figure 6 for Figure 4 Enlarged view of point B;

[0021] In the diagram: 1. Outer ring; 101. Raceway; 102. Middle flange; 103. External flange; 2. Mill support roll; 3. Cylindrical roller; 4. Cage; 5. Middle beam; 6. Pocket; 7. Pocket beam; 8. Protrusion; 9. First inclined surface; 10. First locking point; 11. Second inclined surface; 12. Second locking point. Detailed Implementation

[0022] To make the structure and function of this utility model clearer, the technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0023] See appendix Figure 1-6 A four-row cylindrical roller bearing for a rolling mill support roll includes a rolling mill support roll 2, an outer ring 1, cylindrical rollers 3, and a cage 4. The outer ring 1 is disposed on the outer circumferential surface of the rolling mill support roll 2, and two cages 4 are disposed between the outer ring 1 and the rolling mill support roll 2. Each cage 4 includes a central beam 5 and retaining beams extending from the central beam 5 to both sides. The retaining beams are drilled with holes 6 from their end faces toward the central beam 5 to accommodate the cylindrical rollers 3. The drilled retaining beams form a plurality of pocket beams 7. The inner diameter surface of each pocket beam 7 is provided with a convex... Block 8, the protrusion 8 is a trapezoidal structure, the large bottom surface of the protrusion 8 is connected to the inner diameter surface of the pocket beam 7; the two surfaces of the protrusion 8 near the pocket are the first inclined surface 9 and the second inclined surface 11, which are arranged opposite to each other; the connection between the first inclined surface 9 and the pocket beam 7 forms the first locking point 10, and the connection between the second inclined surface 11 and the pocket beam 7 forms the second locking point 12. The adjacent first locking point 10 and second locking point 12 constitute the locking structure of the cylindrical roller 3, and the locking structure is interference-fitted with the cylindrical roller 3.

[0024] Based on the above technical features, this bearing requires neither an inner ring nor an inner ring flange. The bearing's installation clearance is ensured by the shaft diameter and bearing radius dimensions, eliminating the need to consider clearance reduction due to interference fits during inner ring and shaft installation. This facilitates bearing installation and adjustment, improves bearing replacement efficiency, and increases productivity. In this application, the mill support roll is equivalent to the bearing's inner ring. While meeting the same bearing load capacity requirements, the radial space of the bearing design is reduced, resulting in a more compact overall mill equipment structure.

[0025] Through process verification, it is ensured that the cage will not scratch the roller during the process of pressing the roller into the pocket, and at the same time, due to the self-locking property, the roller will not fall out of the cage.

[0026] The so-called self-locking refers to the interference fit between the locking structure and the cylindrical roller. This interference must ensure that the cylindrical roller is not scratched when it is inserted into the pocket, and that the cylindrical roller will not fall out of the pocket due to gravity. It is also called "loose fit". If it is "loose fit", it will bring great difficulties to the user during installation.

[0027] The axial length of the pocket beam 7 is greater than the axial length of the protrusion 8, and the protrusion 8 is located on the side of the pocket beam 7 away from the middle beam 5; the cage is optimized in design, which reduces the weight of the cage, while still allowing the bearing rollers to be assembled into the cage.

[0028] The perforated beams 7 on both sides of the central beam 5 are staggered.

[0029] The two adjacent protrusions 8 form a guiding structure for the cylindrical roller 3.

[0030] The first locking point 10 is in contact with the cylindrical roller 3, and the second locking point 12 is in contact with the cylindrical roller 3.

[0031] The pocket 6 is a straight pocket.

[0032] The axial length of the pocket beam 7 is less than the height of the cylindrical roller 3.

[0033] The inner diameter of the pocket beam 7 is sloped at the connection with the middle beam 5, and the outer diameter of the pocket beam 7 is sloped at the connection with the middle beam 5; the radial width of the pocket beam 7 is smaller than the radial width of the middle beam 5; the bearing cage reduces weight and lowers bearing cost.

[0034] The outer ring 1 has four raceways 101 arranged side by side on its inner circumferential surface, and a radially penetrating oil hole is provided between two adjacent raceways 101; the four raceways and the radially penetrating oil hole on the inner circumferential surface of the outer ring optimize the oil-air lubrication effect, reduce wear under high load conditions, and extend the service life of the bearing.

[0035] A central retaining edge 102 is formed between two adjacent raceways 101 on the outer ring 1, and two identical external retaining edges 103 are formed on both sides of the outer ring 1; the width of the external retaining edge 103 is less than the width of the central retaining edge 102 and less than 2 × the width of the external retaining edge 103; this further improves the bearing's load-bearing capacity and stability.

[0036] This application applies to the support roll section of a rolling mill, where the bearing uses an oil-air lubrication method. Under the same load conditions, this bearing has a more compact design, reducing bearing costs; it also facilitates installation and improves bearing replacement efficiency. This bearing design reduces both the weight of the bearing rings and the cage, significantly lowering bearing costs. In addition to weight and cost reduction, the cage design solves the bearing assembly problems caused by structural changes, achieving optimized bearing design and assembly.

[0037] In the description of this utility model, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "both ends", "one end", "the other end", 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 utility model 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 utility model.

[0038] The above-disclosed embodiments are merely preferred embodiments of this application and should not be construed as limiting the scope of this application. Therefore, any equivalent variations made in accordance with the claims of this application shall still fall within the scope of this application.

Claims

1. A four-row cylindrical roller bearing for rolling mill support rolls, characterized in that: The device includes a mill support roll, an outer ring, cylindrical rollers, and a cage. The outer ring is located on the outer circumference of the mill support roll, and two cages are positioned between the outer ring and the mill support roll. Each cage includes a central beam and retaining beams extending from the central beam to both sides. The retaining beams have holes drilled from their end faces toward the central beam to accommodate the cylindrical rollers, forming a plurality of pocket beams. The inner diameter surface of each pocket beam has a protrusion with a trapezoidal structure, the large base of which connects to the inner diameter surface of the pocket beam. Two faces on the protrusion near the pockets are a first inclined surface and a second inclined surface, which are positioned opposite each other. A first locking point is formed at the connection between the first inclined surface and the pocket beam, and a second locking point is formed at the connection between the second inclined surface and the pocket beam. Adjacent first and second locking points constitute a locking structure for the cylindrical rollers, and this locking structure is an interference fit with the cylindrical rollers.

2. A four-row cylindrical roller bearing for rolling mill support rolls according to claim 1, characterized in that: The axial length of the pocket beam is greater than the axial length of the protrusion, and the protrusion is located on the side of the pocket beam away from the middle beam.

3. A four-row cylindrical roller bearing for rolling mill support rolls according to claim 1, characterized in that: The perforated beams on both sides of the central beam are staggered.

4. A four-row cylindrical roller bearing for rolling mill support rolls according to claim 1, characterized in that: The two adjacent protrusions form a guiding structure for the cylindrical roller.

5. A four-row cylindrical roller bearing for rolling mill support rolls according to claim 1, characterized in that: The first locking point is in contact with the cylindrical roller, and the second locking point is in contact with the cylindrical roller.

6. A four-row cylindrical roller bearing for rolling mill support rolls according to claim 1, characterized in that: The pocket is a straight pocket.

7. A four-row cylindrical roller bearing for rolling mill support rolls according to claim 1, characterized in that: The axial length of the pocket beam is less than the height of the cylindrical roller.

8. A four-row cylindrical roller bearing for rolling mill support rolls according to claim 1, characterized in that: The inner diameter of the pocket beam is sloped at the connection with the middle beam, and the outer diameter of the pocket beam is sloped at the connection with the middle beam; the radial width of the pocket beam is smaller than the radial width of the middle beam.

9. A four-row cylindrical roller bearing for rolling mill support rolls according to claim 1, characterized in that: Four raceways are arranged side by side on the inner circumference of the outer ring, and a radially penetrating oil hole is provided between two adjacent raceways.

10. A four-row cylindrical roller bearing for rolling mill support rolls according to claim 9, characterized in that: A central retaining edge is formed between two adjacent raceways on the outer ring, and two identical external retaining edges are formed on both sides of the outer ring; the width of the external retaining edge is less than the width of the central retaining edge, which is less than 2 × the width of the external retaining edge.

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