Combined ball bearing for rolling mill

Abstract

The utility model provides a combined ball bearing for a rolling mill. The combined ball bearing comprises an inner ring, a distance ring, a first support ring, a second support ring, a first row of steel balls and a second row of steel balls, the first supporting ring, the second supporting ring and the distance ring form an outer ring; an annular boss is arranged in the middle of the outer circumferential surface of the inner ring; a distance ring is arranged on the outer side of the annular boss, and a first supporting ring and a second supporting ring are arranged on the two end faces of the distance ring respectively. The first row of steel balls are arranged between the annular boss and the first supporting ring, and the second row of steel balls are arranged between the annular boss and the second supporting ring; according to the outer ring split bearing convenient to maintain, the distance ring, the first supporting ring and the second supporting ring are of split structures and can be independently replaced after being damaged, the convenience of assembly and disassembly is good, the maintenance of the bearing inner ring and the steel balls is facilitated, the operation is simple and convenient, and the maintenance cost is reduced; and the axial load bearing capacity is greatly improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of bearings, in particular to a combined ball bearing for a rolling mill. Background Art

[0002] At present, the industry generally pays attention to the bearings at the radial support position of the roller, and pays less attention to the bearings used for positioning and bearing axial load. As the equipment ages, and many sites fail to properly maintain the bearing seats and archways, the axial positioning bearings will be subjected to loads greater than 5% of the rolling force, and traditional four-point contact ball bearings or double-row angular contact ball bearings often seem unable to cope with the load. Utility Model Content

[0003] In view of the above problems, the purpose of this application is to provide a combined ball bearing for a rolling mill. According to the stress characteristics of the rolling mill, the ease of installation is comprehensively considered and a new bidirectional thrust combined ball bearing is designed. The axial load-bearing capacity of this product is greatly increased compared with the previous product load; taking 4034DW / W33 as an example, the rated dynamic load of the original structural bearing is 250kN. When a new structural product of the same size is installed, the rated dynamic load can reach 580kN, the load is increased by 132%, and the bearing life is increased by 16 times under the same working conditions.

[0004]

[0004] In order to achieve some or all of the above-mentioned objectives or other objectives, the present application provides the following technical solutions: a combined ball bearing for a rolling mill, comprising an inner ring, a distance ring, a first support ring, a second support ring, a first row of steel balls and a second row of steel balls; the first support ring, the second support ring and the distance ring constitute an outer ring; an annular boss is arranged in the middle of the outer circumferential surface of the inner ring; a distance ring is arranged on the outer side of the annular boss, and the first support ring and the second support ring are arranged on both end surfaces of the distance ring respectively; the first row of steel balls is arranged between the annular boss and the first support ring, and the second row of steel balls is arranged between the annular boss and the second support ring.

[0005] Furthermore, the first support ring is fixedly connected to the distance ring via bolts, and the second support ring is fixedly connected to the distance ring via bolts.

[0006] Furthermore, a first inner raceway is provided on one end face of the annular boss, a second inner raceway is provided on the other end face of the annular boss, a first outer raceway is provided on the surface of the first support ring close to the first inner raceway of the annular boss, and a second outer raceway is provided on the surface of the second support ring close to the second inner raceway of the annular boss; a first row of steel balls is provided between the first outer raceway and the inner raceway, and a second row of steel balls is provided between the second outer raceway and the inner raceway.

[0007] Furthermore, it also includes a first retaining frame and a second retaining frame; the first retaining frame is arranged on the first row of steel balls, and the second retaining frame is arranged on the second row of steel balls.

[0008] Furthermore, the first retaining frame is provided with a plurality of pockets, on which a first cylindrical surface and a first conical surface are provided; the small diameter end of the first conical surface faces the end surface of the annular boss, and the large diameter end of the first conical surface is connected to the first cylindrical surface; the diameter of the first cylindrical surface is adapted to the diameter of the first row of steel balls, and the diameter of the first cylindrical surface is equal to the large diameter of the first conical surface; the second retaining frame is provided with a plurality of pockets, on which a second cylindrical surface and a second conical surface are provided; the small diameter end of the second conical surface faces the end surface of the annular boss, and the large diameter end of the first conical surface is connected to the first cylindrical surface; the diameter of the second cylindrical surface is adapted to the diameter of the second row of steel balls, and the diameter of the second cylindrical surface is equal to the large diameter of the second conical surface.

[0009] Furthermore, the inner ring is an integrated structure.

[0010] Furthermore, an oil hole is provided on the distance ring.

[0011] Compared with the prior art, the beneficial effects of the utility model are as follows: the present application is applied to the field of rolling mills, an outer ring split bearing structure with easy maintenance, a first support ring, a second support ring, and a distance ring constitute the outer ring, which can be replaced separately after damage, and it is easy to assemble and disassemble, which is convenient for the maintenance of the bearing inner ring and ball, easy to operate, and reduces maintenance costs; the axial load bearing capacity is greatly increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of the utility model;

[0013] Figure 2 The schematic diagram of the pocket structure of the cage equipped with steel balls;

[0014] Figure 3 This is the cross-sectional view of the AA cage;

[0015] Figure 4 It is a cross-sectional view of the cage with chisel marks;

[0016] Figure 5 The schematic diagram of the installation position in the rolling mill is shown in FIG.

[0017] In the figure: 1, inner ring; 2, annular boss; 3, first support ring; 4, second support ring; 5, distance ring; 6, first row of steel balls; 7, second row of steel balls; 8, first retaining frame; 9, second retaining frame; 10, first cylindrical surface; 11, first conical surface. DETAILED DESCRIPTION

[0018] In order to make the structure and function of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0019] See attached Figure 1-3 A combined ball bearing for a rolling mill comprises an inner ring 1, a distance ring 5, a first support ring 3, a second support ring 4, a first row of steel balls 6 and a second row of steel balls 7; the first support ring 3, the second support ring 4 and the distance ring 5 constitute an outer ring; an annular boss 2 is arranged in the middle of the outer circumferential surface of the inner ring 1; a distance ring 5 is arranged on the outer side of the annular boss 2, and the first support ring 3 and the second support ring 4 are arranged on both end surfaces of the distance ring 5 respectively; the first row of steel balls 6 is arranged between the annular boss 2 and the first support ring 3, and the second row of steel balls 7 is arranged between the annular boss 2 and the second support ring 4.

[0020] Furthermore, the first support ring 3 and the distance ring 5 are fixedly connected by bolts, and the second support ring 4 and the distance ring 5 are fixedly connected by bolts, so the structure is firm and the convenience of installation and disassembly is good.

[0021] Furthermore, a first inner raceway is provided on one end face of the annular boss 2, a second inner raceway is provided on the other end face of the annular boss 2, a first outer raceway is provided on the surface of the first support ring 3 close to the first inner raceway of the annular boss 2, and a second outer raceway is provided on the surface of the second support ring 4 close to the second inner raceway of the annular boss 2; a first row of steel balls 6 is provided between the first outer raceway and the inner raceway, and a second row of steel balls 7 is provided between the second outer raceway and the inner raceway.

[0022] Furthermore, it also includes a first retaining frame 8 and a second retaining frame 9 ; the first retaining frame 8 is arranged on the first row of steel balls 6 , and the second retaining frame 9 is arranged on the second row of steel balls 7 .

[0023] Furthermore, a plurality of pockets are provided on the first retaining frame 8, on which a first cylindrical surface 10 and a first conical surface 11 are provided; the small diameter end of the first conical surface 11 faces the end face of the annular boss 2, and the large diameter end of the first conical surface 11 is connected to the first cylindrical surface 10; the diameter of the first cylindrical surface 10 is adapted to the diameter of the first row of steel balls 6, and the diameter of the first cylindrical surface 10 is equal to the large diameter of the first conical surface 11; a plurality of pockets are provided on the second retaining frame 9, on which a second cylindrical surface and a second conical surface are provided; the small diameter end of the second conical surface faces the end face of the annular boss 2, and the large diameter end of the first conical surface 11 is connected to the first cylindrical surface 10; the diameter of the second cylindrical surface is adapted to the diameter of the second row of steel balls 7, and the diameter of the second cylindrical surface is equal to the large diameter of the second conical surface.

[0024] Furthermore, two chisel marks are arranged on the pocket of the first retaining frame 8, the two chisel marks are located on the beam connected to the first cylindrical surface, and the two chisel marks are 180° apart; two chisel marks are arranged on the pocket of the second retaining frame 9, the two chisel marks are located on the beam connected to the second cylindrical surface, and the two chisel marks are 180° apart; so that the steel ball is not easy to fall out of the retaining frame.

[0025] Furthermore, the inner ring 1 is an integrated structure; it is formed by integrated processing and has a firm structure.

[0026] Furthermore, a threaded hole is provided on the end surface of the first support ring 3 in contact with the distance ring 5, and a threaded hole is provided on the end surface of the distance ring 5 in contact with the first support ring 3, and the two threaded holes are fixedly connected by bolts; a threaded hole is provided on the end surface of the second support ring 4 in contact with the distance ring 5, and a threaded hole is provided on the end surface of the distance ring 5 in contact with the second support ring 4, and the two threaded holes are fixedly connected by bolts.

[0027] Furthermore, the distance ring 5 is provided with an oil hole.

[0028] The above disclosure is only the preferred embodiment of the present application, which certainly cannot be used to limit the scope of rights of the present application. Therefore, equivalent changes made according to the claims of the present application are still within the scope covered by the present application.

Claims

1. A combined ball bearing for a rolling mill, characterized in that: It includes an inner ring, a distance ring, a first support ring, a second support ring, a first row of steel balls and a second row of steel balls; the first support ring, the second support ring and the distance ring constitute an outer ring; an annular boss is arranged in the middle of the outer circumferential surface of the inner ring; a distance ring is arranged on the outer side of the annular boss, and the first support ring and the second support ring are arranged on both end surfaces of the distance ring respectively; the first row of steel balls is arranged between the annular boss and the first support ring, and the second row of steel balls is arranged between the annular boss and the second support ring.

2. The combined ball bearing for a rolling mill according to claim 1, characterized in that: The first support ring is fixedly connected to the distance ring by bolts, and the second support ring is fixedly connected to the distance ring by bolts.

3. The combined ball bearing for a rolling mill according to claim 1, characterized in that: A first inner raceway is arranged on one end face of the annular boss, a second inner raceway is arranged on the other end face of the annular boss, a first outer raceway is arranged on the surface of the first support ring close to the first inner raceway of the annular boss, and a second outer raceway is arranged on the surface of the second support ring close to the second inner raceway of the annular boss; a first row of steel balls is arranged between the first outer raceway and the inner raceway, and a second row of steel balls is arranged between the second outer raceway and the inner raceway.

4. The combined ball bearing for a rolling mill according to claim 1, characterized in that: It also includes a first retaining frame and a second retaining frame; the first retaining frame is arranged on the first row of steel balls, and the second retaining frame is arranged on the second row of steel balls.

5. The combined ball bearing for a rolling mill according to claim 4, characterized in that: The first retaining frame is provided with a plurality of pockets, on which a first cylindrical surface and a first conical surface are provided; the small diameter end of the first conical surface faces the end surface of the annular boss, and the large diameter end of the first conical surface is connected to the first cylindrical surface; the diameter of the first cylindrical surface is adapted to the diameter of the first row of steel balls, and the diameter of the first cylindrical surface is equal to the large diameter of the first conical surface; the second retaining frame is provided with a plurality of pockets, on which a second cylindrical surface and a second conical surface are provided; the small diameter end of the second conical surface faces the end surface of the annular boss, and the large diameter end of the first conical surface is connected to the first cylindrical surface; the diameter of the second cylindrical surface is adapted to the diameter of the second row of steel balls, and the diameter of the second cylindrical surface is equal to the large diameter of the second conical surface.

6. The combined ball bearing for a rolling mill according to claim 1, characterized in that: The inner ring is an integrated structure.

7. The combined ball bearing for a rolling mill according to claim 1, characterized in that: The distance ring is provided with an oil hole.

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