Working roller bearing

Abstract

The utility model relates to a working roller bearing which comprises an outer sleeve unit, an inner ring and a retainer assembly arranged between the outer sleeve unit and the inner ring, the outer sleeve unit comprises two outer rings and a middle check ring, and the middle check ring is arranged between the two outer rings; a set of retainer assembly is arranged between each outer ring and the corresponding inner ring; each set of retainer assembly comprises a retainer and three rows of rolling bodies contained in pockets of the retainer; a lubricating oil hole is formed in the middle check ring in the direction from the outer diameter to the inner diameter. The outer ring adopts a long raceway type single raceway design, and the long raceway design form of the outer ring forms a retainer assembly formed by combining a plurality of rolling bodies and a retainer; during installation, each set of retainer assembly is taken as a unit to be assembled in sequence, so that the bearing is convenient to install, disassemble and inspect, the retainer assembly is easy to disassemble after the outer ring is disassembled, and the use condition of a raceway of the inner ring of the bearing is easy to observe, so that the inner ring is convenient to replace regularly in time, and the method has small influence on the precision of a roller.

Description

Technical Field

[0001] This utility model relates to steel bearings for rolling mill rolls, specifically to a work roll bearing for rolling mill rolls, which belongs to the metallurgical field. Background Technology

[0002] During operation, the rolling mill rolls transmit power to the rolling wheels via mechanical transmission. By changing the speed and controlling the applied pressure, the material is compacted and shaped. Because rolling mill rolls require high precision, there are specific requirements for the design, assembly, and disassembly of the rolling mill roll bearings. The bearings must be easy to install and remove, have good access to the inner raceway, and their design must minimize their impact on the rolling mill's precision and lifespan. Therefore, a rolling mill roll bearing that meets these requirements needs to be designed. Utility Model Content

[0003] In view of the above-mentioned problems that need to be solved and the defects of the existing technology, the purpose of this utility model is to provide a work roll bearing for a rolling mill. The bearing has a novel structural design, enhanced load-bearing capacity, and is easy to install and disassemble. This allows for easy observation of the condition of the inner raceway, enabling timely replacement of the inner raceway and greatly improving work efficiency.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a rolling mill work roll bearing, comprising an outer sleeve unit, an inner ring, and a cage assembly disposed between the outer sleeve unit and the inner ring; the outer sleeve unit comprises two outer rings and a middle retaining ring, the middle retaining ring being disposed between the two outer rings; the two end faces of the middle retaining ring respectively abut against the end faces of the two adjacent outer rings and form a retaining edge between the two outer rings; a cage assembly is disposed between each outer ring and the inner ring; each cage assembly comprises a cage and three rows of rolling elements housed in the cage pocket; the middle retaining ring has a lubricating oil hole in the direction from its outer diameter to its inner diameter;

[0005] Furthermore, the inner ring is a one-piece single-track structure without a retaining edge;

[0006] Furthermore, each of the outer rings is designed with a single retaining edge, and the retaining edge is located in the direction of the two end faces of the bearing;

[0007] Furthermore, the inner diameter of the outer ring in the region between the single stop edge of each outer ring and the end face of the middle stop ring is set as a long raceway, and the three rows of rolling elements of the cage assembly are all in rolling contact between the long raceway of the outer ring and the raceway of the inner ring.

[0008] Furthermore, the outer end faces of the two rolling elements located at both ends of the three rolling elements are respectively in close contact with the inside of the outer ring single retaining edge and the end face of the middle retaining ring; each pair of adjacent rolling elements in the three rolling elements are in close contact with each other;

[0009] Furthermore, the length of each rolling element in the three rows of rolling elements can be adjusted adaptively as needed, and can be set to be equal or unequal in length;

[0010] The installation and disassembly process for the structural design of this scheme is as follows:

[0011] During installation, first place the inner ring, then the first outer ring, then the first cage assembly; then place the middle retaining ring, then the second cage assembly, and finally the second outer ring to complete the installation. This structure enhances the load-bearing capacity and facilitates installation. It also makes inspection easier; when the outer ring is removed, the cage assembly can be easily disassembled, and the operation process is the reverse of the installation process described above. This allows for easy inspection of the inner ring raceway condition. Furthermore, since the rolls have high precision requirements, this method has minimal impact on roll accuracy.

[0012] Furthermore, the cage adopts a separate form of cage seat and cage cover. The cage seat has several evenly spaced pockets machined at one end, and a cage beam is formed between adjacent pockets. Square-head rivet heads are machined at the ends of each cage beam in the direction of the opening of the cage pockets. Rivet head connection holes are opened on the cage cover corresponding to the square-head rivet heads. The cage cover is fitted onto the cage seat through the rivet head connection holes and the square-head rivet heads, and is then welded together by hot riveting. This method results in high cage strength, eliminates the need for additional rivets, facilitates installation, and has no impact on the bearing's accuracy.

[0013] Furthermore, in order to increase the bearing lubrication performance, this solution provides several lubricating oil grooves at equal intervals around the outer ring end face.

[0014] The beneficial effects of this utility model are:

[0015] The outer ring adopts a single raceway design with a long raceway, changing the traditional design of two raceways with a middle retainer. The long raceway design of the outer ring forms a cage assembly that combines multiple rolling elements with the cage. A bearing set uses two outer rings separated by a middle retainer, thus forming a three-component bearing outer ring. The multiple rolling elements between each outer ring raceway and the inner ring, together with a cage, form a cage assembly. During installation, each cage assembly is assembled sequentially as a unit, making the bearing installation convenient and disassembly and inspection relatively easy. After the outer ring is removed, the cage assembly is easy to disassemble, making it easy to observe the condition of the bearing inner ring raceway, so as to facilitate timely and regular replacement of the inner ring. This method has little impact on the accuracy of the rolls.

[0016] The cage adopts a square-head rivet structure machined on the cage seat. After assembly, it can be hot-riveted to the cage cover without the need for rivets, making installation more convenient. This method results in high cage strength, does not affect the bearing's precision, and will not negatively impact the bearing's lifespan.

[0017] Furthermore, the outer ring end face is provided with a lubricating oil groove, which can play a good lubricating role and prevent the temperature from rising during use, so as to avoid premature fatigue of the inner and outer ring raceways and rolling element surfaces, which would affect the service life of the bearing. Attached Figure Description

[0018] Figure 1 This is a structural diagram of one embodiment of the working roll bearing of this utility model.

[0019] Figure 2 This is a structural diagram of the cage seat in the working roll bearing of this utility model.

[0020] Figure 3 This is a structural diagram of the outer ring of the working roll bearing of this utility model.

[0021] Figure 4 This is a structural diagram of the working roll bearing of this utility model.

[0022] Figure 5 This is a structural diagram of the cage cover in the working roll bearing of this utility model.

[0023] Figure 6 for Figure 5 AA sectional view.

[0024] Figure 7 This is a structural diagram of the work roll bearing of a traditional rolling mill.

[0025] The markings in this diagram are: 1. Inner ring, 2. Outer ring, 3. Middle retaining ring, 4. Rolling element, 5. Lubricating oil hole, 2.1. Outer ring single retaining edge, 6. Cage seat, 7. Cage cover, 7.1. Rivet head connection hole, 6.1. Pocket hole, 6.2. Cage beam, 6.3. Square head rivet head, 8. Lubricating oil groove.

[0026] Traditional structure work roll bearing reference numerals: 1. Inner ring, 2. Outer ring, 3. Cage, 4. Rolling element. Detailed Implementation

[0027] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0028] See also Figure 1-6An embodiment of a work roll bearing shown includes an outer sleeve unit, an inner ring 1, and a cage assembly disposed between the outer sleeve unit and the inner ring 1. The outer sleeve unit includes two outer rings 2 and a middle retainer ring 3, the middle retainer ring 3 being disposed between the two outer rings 2. The two end faces of the middle retainer ring 3 respectively abut against the end faces of the two adjacent outer rings 2, forming a retaining edge between the two outer rings 2. A cage assembly is disposed between each outer ring 2 and the inner ring 1. Each cage assembly includes a cage and three rows of rolling elements 4 housed in the cage pocket 6.1. The middle retainer ring 3 has a lubricating oil hole 5 in the direction from its outer diameter to its inner diameter.

[0029] Furthermore, the inner ring 1 is an integral single raceway structure without a retaining edge;

[0030] Furthermore, each of the outer rings 2 is designed with a single retaining edge, and the retaining edge is located in the direction of the two end faces of the bearing;

[0031] Furthermore, the inner diameter of the outer ring 2 in the region between the single retaining edge 2.1 and the end face of the middle retaining ring 3 is set as a long raceway, and the three rows of rolling elements 4 of the cage assembly are all in rolling contact between the long raceway of the outer ring 2 and the raceway of the inner ring 1.

[0032] Furthermore, the outer end faces of the two rows of rolling elements 4 located at both ends of the three rows of rolling elements 4 are respectively close to the inside of the outer ring single flange 2.1 and the end face of the middle flange 3; each pair of adjacent rolling elements 4 in the three rows of rolling elements 4 are in contact with each other;

[0033] Furthermore, the length of each rolling element in the three rows of rolling elements 4 can be adjusted adaptively as needed, and can be set to be equal or unequal lengths;

[0034] In this design, the long raceway design of the outer ring 2 allows the rolling element 4 and the cage to be combined into a cage assembly, enabling the outer ring 2 and the cage assembly to operate independently, unlike in traditional designs. Figure 7 As shown, it consists of two outer rings 2, four rows of rolling elements 4, two cages 3, and one inner ring 1; one cage 3, with two rows of rolling elements 4, forms an outer assembly with the outer ring 2, which is inseparable.

[0035] The installation and disassembly process for the structural design of this scheme is as follows:

[0036] During installation, first place the inner ring 1, then the first outer ring, and then the first cage assembly; then place the middle retaining ring 3, then the second cage assembly, and finally the second outer ring to complete the installation. This structure enhances the load-bearing capacity and facilitates installation. At the same time, it also facilitates inspection. When the outer ring 2 is removed, the cage assembly can be easily disassembled. The operation process is the reverse of the installation process described above, which makes it easy to check the condition of the inner ring raceway. Moreover, since the precision requirements of the rolls are relatively high, this method has little impact on the roll precision.

[0037] Compared to the traditional design, the installation process involves placing the inner ring 1 first, then the first outer component, and finally the second outer component. However, this bearing has the disadvantage that after the bearing has been running for a period of time, the outer components are difficult to disassemble. The outer ring and the rolling element 4 are together, and disassembling them as a whole is quite troublesome. It is also difficult to observe the condition of the inner ring 1 raceway, which is detrimental to the equipment. Moreover, this disassembly process has a significant impact on the accuracy of the rolls.

[0038] Furthermore, the cage adopts a separate form of cage seat 6 and cage cover 7. The cage seat 6 has several uniformly spaced pockets 6.1 machined at one end, and cage beams 6.2 are formed between adjacent pockets 6.1. Square-head rivet heads 6.3 are machined at the ends of each cage beam 6.2 in the opening direction of the cage pockets 6.3. Rivet head connection holes 7.1 are opened on the cage cover 7 corresponding to the square-head rivet heads 6.3. The cage cover 7 is fitted onto the cage seat 6 through the mating of its rivet head connection holes 7.1 and square-head rivet heads 6.3, and is then hot-riveted together. This method results in high cage strength, eliminates the need for additional rivets, facilitates installation, and has no impact on the bearing's accuracy.

[0039] It should be noted that after the cage cover 7 is fitted onto the square head rivet head 6.3 of the cage seat 6, the square head rivet head 6.3 will extend beyond the cage cover 7. During hot riveting, the part of the square head rivet head 6.3 extending beyond the cage cover 7 will be fused and flattened. The final processed area of ​​the square head rivet head 6.3 extending beyond the cage cover 7 has a relatively large diameter, making its diameter larger than the diameter of the rivet head connection hole 7.1 of the cage cover 7. This provides a fixing function for the cage cover 7, thereby preventing the cage cover 7 from falling off when subjected to working force and ensuring normal operation.

[0040] Compared to other existing cage structures, in addition to the cage seat and cover, there are rivets. Moreover, this double-row rolling element structure results in very long rivets. When drilling the rivet holes for the first time, the verticality difference of the rivet holes will be poor. Under a certain vertical angle, the verticality will be amplified, affecting the appearance. After the rivets are inserted into the cage, they will also shift. So when the rivet heads are riveted after the cage cover is closed, the rivet shank is prone to bending and deformation. This will not only affect the stability and rotational accuracy of the cage, but also have a negative impact on the life of the bearing.

[0041] Furthermore, in order to increase the bearing lubrication performance, the outer ring 2 end face is provided with several lubricating oil grooves 8 at equal intervals in the circumference, which plays a good lubrication role and prevents the bearing from generating temperature rise during use, which could lead to premature fatigue of the inner and outer ring raceways and rolling element 4 surfaces, thus affecting the bearing's service life.

[0042] Specifically, in this embodiment, four lubricating oil grooves 8 are evenly provided on each end face of the outer ring 2.

[0043] Furthermore, in this design, the lubrication hole 5 of the bearing is located on the middle retaining ring 3, rather than on the raceway of the outer ring 2, thereby preventing any impact on the bearing's lifespan.

[0044] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0045] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0046] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," 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, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0047] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0048] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

Claims

1. A working roll bearing, characterized in that, The device includes an outer ring unit, an inner ring, and a cage assembly disposed between the outer ring unit and the inner ring. The outer ring unit includes two outer rings and a middle retainer ring, wherein the middle retainer ring is disposed between the two outer rings. The two end faces of the middle retainer ring abut against the end faces of the two adjacent outer rings, forming a retaining edge between the two outer rings. A cage assembly is disposed between each outer ring and the inner ring. Each cage assembly includes a cage and three rows of rolling elements housed in a cage pocket. The middle retainer ring has a lubricating oil hole in the direction from its outer diameter to its inner diameter.

2. The work roll bearing according to claim 1, characterized in that: The inner ring is a one-piece single-track structure without any retaining edges.

3. The work roll bearing according to claim 1, characterized in that: Each of the outer rings is designed with a single retainer, and the retainer is located at both ends of the bearing.

4. A work roll bearing according to claim 3, characterized in that: The inner diameter of the outer ring is set as a long raceway in the area between the single retaining edge of each outer ring and the end face of the middle retaining ring. All three rows of rolling elements of the cage assembly are in rolling contact between the long raceway of the outer ring and the raceway of the inner ring.

5. A work roll bearing according to claim 3, characterized in that: The outer end faces of the two rolling elements at both ends of the three rolling elements are respectively close to the inside of the outer ring single retainer and the end face of the middle retainer; each pair of adjacent rolling elements in the three rolling elements are in contact with each other.

6. A work roll bearing according to claim 1, characterized in that: The length of each rolling element in the three rows can be adjusted adaptively as needed, and can be set to be equal or unequal lengths.

7. A work roll bearing according to claim 1, characterized in that: The cage adopts a separate form of cage base and cage cover. The cage base has several evenly spaced pockets machined at one end, and a cage beam is formed between adjacent pockets. Square-head rivet head structures are machined at the ends of each cage beam in the direction of the opening of the cage pockets. Rivet head connection holes are opened on the cage cover corresponding to the square-head rivet heads. The cage cover is fitted onto the cage base through the rivet head connection holes and the square-head rivet heads, and is then joined together by hot riveting.

8. A work roll bearing according to claim 1, characterized in that: The outer ring end face is provided with several lubricating oil grooves at equal intervals in the circumferential direction.

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