An eight-row cylindrical roller bearing for rolling mills

Abstract

This invention relates to the field of bearing technology, specifically disclosing an eight-row cylindrical roller bearing for rolling mills, comprising a guide structure, an outer rotating structure, and an inner rotating structure. The outer rotating structure is detachably mounted on the guide structure, and the inner rotating structure is detachably mounted through the middle of the guide structure. Through the guide structure, cylindrical rollers are movably mounted on both ends of a rotating shaft, and the rotating shaft is fixedly mounted through the cage insertion holes. If the rollers are worn, the outer rotating structure can be disassembled directly and the cylindrical rollers can be removed and replaced separately without scrapping the entire bearing. The sleeve shaft of the outer rotating structure is detachably connected to the connecting rod and the connecting seat through a rod groove, a locking block, and a first bolt. The side retaining ring of the inner rotating structure is detachably fixed to the inner rotating ring through a second bolt. When replacing components, only the corresponding bolts and connecting parts need to be removed, without disassembling the main body of the rolling mill, making it extremely easy to replace the cylindrical rollers.

Description

Technical Field

[0001] This invention relates to the field of bearing technology, specifically to an eight-row cylindrical roller bearing for rolling mills. Background Technology

[0002] As the core production equipment in the field of metal rolling and processing, rolling mills need to operate under harsh conditions of high radial load, high frequency impact load and continuous high speed for a long time. The cylindrical roller bearings in its transmission system, which are responsible for force transmission and motion guidance, directly determine the operating stability, production efficiency and rolling accuracy of the rolling mill.

[0003] Given the stringent requirements of rolling mill operating conditions on bearings, while traditional cylindrical roller bearings for rolling mills can meet basic transmission needs, they have gradually revealed various technical defects in practical applications, making them unsuitable for the high-efficiency, low-consumption, and long-cycle operation requirements of modern rolling mills. Specific problems are as follows:

[0004] The disassembly, assembly, and maintenance of cylindrical roller bearings for rolling mills are difficult and costly. Most existing cylindrical roller bearings use an integrated fixed structure consisting of an outer ring, inner ring, and roller assembly, with no detachable connection between the core components. When wear, deformation, or other failures occur in the internal cylindrical rollers, cage, or shaft of the bearing, the damaged parts cannot be disassembled and replaced individually; the entire bearing must be removed from the rolling mill transmission system and scrapped for replacement.

[0005] With fixed load-bearing capacity and poor adaptability to working conditions, the load requirements of different specifications of rolling mills (such as cold rolling thin plate mills and hot rolling thick plate mills) and different rolling processes of the same rolling mill (such as roughing and finishing) vary greatly. The number of roller rows of traditional bearings is fixed by the factory design (mostly 4 or 6 rows), and the load-bearing capacity cannot be flexibly adjusted according to the actual load conditions. Lubrication and maintenance are inconvenient, and core components are prone to wear. In particular, when existing single bearings are used in combination, their rotation is not uniform, the force is uneven, and they are extremely prone to wear. Summary of the Invention

[0006] The purpose of this invention is to provide an eight-row cylindrical roller bearing for rolling mills, in order to solve the technical problems mentioned in the background art, such as the significant technical shortcomings of existing cylindrical roller bearings for rolling mills in terms of ease of disassembly and maintenance, adaptability to load-bearing conditions, structural stability and lubrication efficiency, which cannot meet the technical requirements of modern rolling mills for low-cost, high-reliability and long-life transmission components.

[0007] To achieve the above objectives, the present invention provides the following technical solution: an eight-row cylindrical roller bearing for rolling mills, comprising a guide structure, an outer rotating structure, and an inner rotating structure; the outer rotating structure is detachably mounted on the guide structure, and the inner rotating structure is detachably inserted through the middle of the guide structure; wherein, the guide structure is used for the transition between the outer rotating structure and the inner rotating structure, enabling the outer rotating structure to rotate relative to the inner rotating structure through the guide structure; the outer rotating structure is used to support and protect the guide structure, and the outer rotating structure can be relatively connected; the inner rotating structure is used to fit the guide structure and the outer rotating structure to form an inner rotating support body.

[0008] Preferably, the guiding structure includes a cage, several rotating shafts, and several cylindrical rollers; the cage is a circular ring structure, and several insertion holes are equally spaced on the side wall; several rotating shafts are respectively fixed through the insertion holes of the cage; several cylindrical rollers are respectively movably fitted at both ends of the rotating shafts and are respectively located symmetrically on both sides of the cage.

[0009] Preferably, the diameter of the cylindrical roller is greater than the width difference between the inner and outer diameters of the cage.

[0010] Preferably, the external rotating structure includes a pair of sleeve shafts, several connecting rods, several connecting seats, and several first bolts; the pair of sleeve shafts are both cylindrical structures without left side walls, and an inner rotating groove is provided in the middle of the right side wall of the sleeve shaft; an inner rotating hole communicating with the sleeve shaft is opened in the middle of the inner rotating groove of the pair of sleeve shafts; an annular assisting groove larger than the diameter of the inner rotating hole is opened in the inner right side wall of the pair of sleeve shafts; fixing grooves are symmetrically arranged at equal intervals on the outer side walls of both the left and right ends of the pair of sleeve shafts; rod grooves corresponding to the fixing grooves are symmetrically arranged at equal intervals on the left side wall of the pair of sleeve shafts; and a locking groove penetrating the rod groove is opened in the middle of the fixing groove. A pair of sleeve shafts are movably mounted on cylindrical rollers, and the sleeve shafts are symmetrically located on both sides of the cage. The auxiliary grooves inside the pair of sleeve shafts are movably mounted on the rotating shaft. The two ends of several docking rods are detachably inserted into the corresponding rod grooves of the sleeve shafts, and both ends of the docking rods are provided with locking grooves identical to the rod grooves. Both ends of several docking seats are symmetrically provided with protruding locking blocks. Both ends of several docking seats are detachably embedded between the corresponding fixing grooves of the sleeve shafts, and the locking blocks are inserted into the locking grooves and penetrate the rod grooves and docking rods. Several first bolts movably penetrate both ends of the docking seats.

[0011] Preferably, the first bolt is countersunk to the mating seat, and several of the first bolts are screwed into the inner wall of the fixing groove.

[0012] Preferably, the inner rotating structure includes an inner rotating ring, a pair of side retaining rings, and several second bolts; the inner rotating ring movably passes between the cylindrical rollers, and both ends of the inner rotating ring are movably inserted into the inner rotating holes of the sleeve shaft; the pair of side retaining rings are detachably mounted at both ends of the inner rotating ring, and the side retaining rings are movably embedded in the inner rotating groove; the several second bolts are countersunk and equidistantly pass through the side retaining rings, and are screwed into the side walls at both ends of the inner rotating ring.

[0013] Preferably, the right end of the rotating shaft can be spliced ​​by fixing the mating seat with the first bolt.

[0014] Preferably, the locking groove is connected to the inside of the rotating shaft to facilitate the filling of lubricating oil.

[0015] Preferably, both ends of the rotating shaft can rotate within the assist groove, realizing three support points at both ends and the middle of the rotating shaft.

[0016] The core advantages of the eight-row cylindrical roller bearing for rolling mills proposed in this invention compared to traditional eight-row cylindrical roller bearings for rolling mills are as follows:

[0017] 1. In this solution, the cylindrical rollers are movably mounted on both ends of the rotating shaft in the guide structure, and the rotating shaft is fixed through the cage insertion hole. If the rollers are worn, the outer rotating structure can be disassembled and the cylindrical rollers can be removed and replaced separately without scrapping the entire bearing. The sleeve shaft of the outer rotating structure is detachably connected to the connecting rod and the connecting seat through the rod groove, locking block and the first bolt. The side retaining ring of the inner rotating structure is detachably fixed to the inner rotating ring through the second bolt. When replacing the parts, only the corresponding bolts and connecting parts need to be removed, without disassembling the main body of the rolling mill, making it very easy to replace the cylindrical rollers.

[0018] 2. The middle part of the rotating shaft is fixed through the retainer insertion hole (first support point), and the two ends can rotate in the auxiliary groove of the sleeve shaft (second support point and third support point), forming a three-point support structure with the middle fixed and the two ends limited; it can evenly distribute the radial load and impact load of the rolling mill, avoid local stress concentration between the roller and the rotating shaft and sleeve shaft, and extend the service life.

[0019] 3. Existing cylindrical roller bearings have closed lubrication channels, requiring the entire outer ring or protective components to be disassembled for oil filling. This is not only cumbersome but also prone to causing the lubricating oil to not reach the rollers accurately. In this solution, the locking groove of the external rotating structure is directly connected to the inside of the sleeve shaft, allowing the lubricating oil to be injected directly into the bearing through the locking groove without disassembling the mating seat, sleeve shaft, or other components, thus significantly reducing maintenance time.

[0020] 4. The right end of the outer rotating structure can be fixed to the docking seat by the first bolt, and another set of sleeve shafts can be spliced ​​to increase the number of cylindrical roller rows. The number of spliced ​​rows can be flexibly adjusted according to the actual load requirements of the rolling mill. There is no need to stock multiple specifications of bearings, which reduces inventory costs and can accurately match the load requirements of different rolling conditions. Only the corresponding bearing inner and outer ring diameters need to be set.

[0021] 5. When splicing the external rotating structure, the connecting rod is inserted into the rod groove of the sleeve shaft on both sides, and the locking block of the connecting seat passes through the rod groove and the locking groove of the connecting rod. Then, the first bolt is countersunk and locked to form a rigid connection without gaps. This ensures that the multi-row bearings rotate synchronously after splicing without relative displacement or slippage, which can improve the stability of the rolling mill operation and reduce rolling accuracy problems caused by transmission deviation.

[0022] In summary, this solution addresses the core pain points of existing cylindrical roller bearings, such as difficult maintenance, poor stability, low adaptability, poor lubrication, and weak synchronization. It better meets the high-load, long-cycle, and high-precision operation requirements of rolling mills, and has stronger technical practicality and market competitiveness. Attached Figure Description

[0023] Figure 1 This is a schematic diagram illustrating the splicing and assembly structure of the present invention;

[0024] Figure 2 This is a schematic diagram of the assembly structure of the present invention;

[0025] Figure 3 This is a schematic diagram of the disassembled guide structure of the present invention;

[0026] Figure 4 This is a schematic diagram of the assembly structure of the guiding structure of the present invention;

[0027] Figure 5 This is a schematic diagram of the external rotating structure of the present invention.

[0028] Figure 6 This is a schematic diagram of the assembly structure of the external rotating structure and the guiding structure of the present invention;

[0029] Figure 7 This is a schematic diagram of the internal rotation structure of the present invention.

[0030] Figure 8 for Figure 5 Enlarged view of section A in the image;

[0031] Figure 9 This is an enlarged schematic diagram of the locking groove planing structure of the present invention.

[0032] In the diagram: 1. Guide structure; 11. Cage; 12. Rotating shaft; 13. Cylindrical roller; 14. Insertion hole; 2. Outer rotating structure; 21. Sleeve shaft; 22. Connecting rod; 23. Connecting seat; 24. First bolt; 25. Inner rotating groove; 26. Inner rotating hole; 27. Assist groove; 28. Fixing groove; 29. ​​Rod groove; 3. Inner rotating structure; 31. Inner rotating ring; 32. Side retaining ring; 33. Second bolt; 4. Locking groove; 5. Locking block. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] Please see Figures 1-9 The present invention provides a technical solution: an eight-row cylindrical roller bearing for rolling mills, comprising a guide structure 1, an outer rotating structure 2, and an inner rotating structure 3; the outer rotating structure 2 is detachably mounted on the guide structure 1, and the inner rotating structure 3 is detachably inserted through the middle of the guide structure 1; wherein, the guide structure 1 is used for the transfer between the outer rotating structure 2 and the inner rotating structure 3, so that the outer rotating structure 2 can rotate relative to the inner rotating structure 3 through the guide structure 1, the outer rotating structure 2 is used to support and protect the guide structure 1, and the outer rotating structure 2 can be transferred relative to the guide structure 1, and the inner rotating structure 3 is used to fit the guide structure 1 and the outer rotating structure 2 to form an inner rotating support body.

[0035] As a preferred embodiment, the guiding structure 1 includes a cage 11, a plurality of rotating shafts 12, and a plurality of cylindrical rollers 13. The cage 11 is a ring structure, and a plurality of insertion holes 14 are equally spaced on its side walls. The plurality of rotating shafts 12 are fixedly inserted through the insertion holes 14 of the cage 11. The plurality of cylindrical rollers 13 are movably fitted onto both ends of the rotating shafts 12 and are symmetrically located on both sides of the cage 11. The diameter of the cylindrical rollers 13 is greater than the difference in width between the inner and outer diameters of the cage 11. The rotating shafts 12 are supported by the cage 11, thereby symmetrically supporting the cylindrical rollers 13.

[0036] More specifically, the diameter of the cylindrical roller 13 is designed to be greater than the difference between the inner and outer diameters of the cage 11. This size design allows the inner part of the cylindrical roller 13 to extend out of the inner ring wall of the cage 11 and the outer part to extend out of the outer ring wall of the cage 11 after assembly. This ensures that the cylindrical roller 13 can simultaneously form effective contact with the outer wall of the inner rotating ring 31 of the inner rotating structure 3 and the inner wall of the sleeve shaft 21 of the outer rotating structure 2, thereby realizing the function of force transmission and relative rotation.

[0037] By using the cage 11 to fix and support several rotating shafts 12, and the symmetrical installation and limiting of the rotating shafts 12 on the cylindrical rollers 13, the guiding structure 1 forms a stable overall structure, which can effectively disperse the radial load and impact load generated during the operation of the rolling mill and avoid the concentration of force on a single component. At the same time, the movable assembly design of the cylindrical rollers 13 and the rotating shafts 12 allows the cylindrical rollers 13 to be removed and replaced separately after the outer rotating structure 2 is disassembled when the cylindrical rollers 13 experience wear, deformation or other faults, without having to scrap the entire bearing, which significantly reduces the operation and maintenance costs.

[0038] As a preferred embodiment, the outer rotating structure 2 includes a pair of sleeve shafts 21, several connecting rods 22, several connecting seats 23, and several first bolts 24. Both sleeve shafts 21 are cylindrical structures without a left side wall, and an inner rotating groove 25 is provided in the middle of the right side wall of each sleeve shaft 21. An inner rotating hole 26 communicating with the sleeve shaft 21 is opened in the middle of the inner rotating groove 25 of each sleeve shaft 21. An annular assisting groove 27 larger than the diameter of the inner rotating hole 26 is opened in the inner right side wall of each sleeve shaft 21. Fixing grooves 28 are symmetrically arranged at equal intervals on the outer side walls of both ends of each sleeve shaft 21. Rod grooves 29 corresponding to the fixing grooves 28 are symmetrically arranged at equal intervals on the left side wall of each sleeve shaft 21. A locking groove 4 penetrating the rod groove 29 is opened in the middle of each fixing groove 28. Each pair of sleeve shafts 21 is movably fitted onto cylindrical rollers 13, and the sleeve shafts 21 are symmetrically located on both sides of the retainer 11. The assisting grooves 27 inside each pair of sleeve shafts 21 are movably fitted onto rotating shafts 12. Several connecting rods 22 are detachably inserted into the corresponding rod grooves 29 of the sleeve shaft 21 at both ends, and both ends of the connecting rods 22 are provided with locking grooves 4 identical to those in the rod grooves 29. Several connecting seats 23 are symmetrically provided with protruding locking blocks 5 at both ends. Several connecting seats 23 are detachably embedded between the corresponding fixing grooves 28 of the sleeve shaft 21 at both ends, and the locking blocks 5 are inserted into the locking grooves 4 and pass through the rod grooves 29 and the connecting rods 22. Several first bolts 24 pass through both ends of the connecting seats 23, and the first bolts 24 and the connecting seats 23 are countersunk. Several first bolts 24 are screwed into the inner wall of the fixing grooves 28. The sleeve shaft 21 is sleeved on the outside of the cylindrical roller 13 to form the outer transmission body of the bearing. With the help of the structural design of the sleeve shaft 21, the connecting rods 22 and the connecting seats 23 are locked together to form synchronous rotation. At the same time, the number of rows can be increased according to the needs, which improves the convenience of the overall bearing assembly.

[0039] The inner diameter of the sleeve 21 is matched with the outer diameter of the cylindrical roller 13 to ensure a rolling fit between the two and reduce transmission friction; the inner diameter of the assist groove 27 is clearance matched with the outer diameters at both ends of the rotating shaft 12, which provides rotational support for the rotating shaft 12 and avoids interfering with the flexible rotation of the rotating shaft 12. Together with the guide structure 1, it forms a three-point support structure for the rotating shaft 12, which evenly distributes the radial load.

[0040] The fit clearance between the connecting rod 22 and the rod groove 29 is controlled at 0.02-0.05mm to ensure that the connecting rod 22 can be quickly inserted without loosening, while transmitting torque. The locking block 5 and the locking groove 4 adopt a transition fit, with no gap after insertion, to ensure the locking and fixing effect of the connecting seat 23 on the sleeve shaft 21 and the connecting rod 22, forming a gapless rigid connection, ensuring that the bearings rotate synchronously after multi-row splicing without relative displacement or slippage.

[0041] The countersunk head installation design of the first bolt 24 avoids interference caused by the protruding bolt head, ensuring the flatness of the overall bearing structure, and preventing friction and collision between the first bolt 24 and external components during operation. The locking groove 4 is connected to the inside of the rotating shaft 12. After assembly, lubricating oil can be directly injected into the bearing through the locking groove 4, accurately reaching the core transmission components such as the rotating shaft 12 and the cylindrical roller 13, without the need to disassemble the docking seat 23, the sleeve shaft 21, etc., which greatly improves the efficiency of lubrication and maintenance.

[0042] The detachable design of the outer rotating structure 2 allows the sleeve shaft 21 to be disassembled from the guide structure 1 and the damaged parts to be replaced individually when the cylindrical roller 13 or the sleeve shaft 21 experiences wear failure. This eliminates the need to disassemble the main body of the rolling mill or scrap the entire bearing, significantly reducing maintenance costs.

[0043] As a preferred embodiment, the inner rotating structure 3 includes an inner rotating ring 31, a pair of side retaining rings 32, and several second bolts 33. The inner rotating ring 31 movably passes through the cylindrical rollers 13, and both ends of the inner rotating ring 31 are movably inserted into the inner rotating holes 26 of the sleeve shaft 21. The pair of side retaining rings 32 are detachably placed at both ends of the inner rotating ring 31, and the side retaining rings 32 are movably embedded in the inner rotating grooves 25. Several second bolts 33 are countersunk and equidistantly pass through the side retaining rings 32, and are screwed into the side walls at both ends of the inner rotating ring 31. The inner rotating ring 31 supports the middle part of the cylindrical rollers 13 to form an inner rotating body, and is limited by the detachable side retaining rings 32 embedded in the sleeve shaft 21, which also helps to limit the relative positioning of the sleeve shaft 21.

[0044] As a preferred option, in order to increase the overall load-bearing capacity of the bearing, the right end of the rotating shaft 12 can be spliced ​​with the docking seat 23 by fixing the first bolt 24 to meet design requirements and realize the combination of bearing rows of different equipment; in order to facilitate the filling of lubricating oil, the locking groove 4 is connected to the inside of the rotating shaft 12, which facilitates single maintenance without the need for overall disassembly; in order to improve the stability of the rotating shaft 12, both ends of the rotating shaft 12 can rotate in the assist groove 27 to realize three support points at both ends and the middle of the rotating shaft 12, improve the stability of the cage 11, and share the force of the cylindrical roller 13.

[0045] Its detailed connection method is a well-known technology in this field. The following mainly introduces the working principle and process, and the specific work is as follows.

[0046] First, the rotating shaft 12 passes through the insertion hole 14 of the cage 11 in sequence, and the cylindrical rollers 13 in the guide structure 1 are respectively fitted onto the two ends of the rotating shaft 12 arranged on the cage 11. Then, the cylindrical rotor is symmetrically located on both sides of the cage 11 and arranged to form a ring.

[0047] Secondly, the sleeve shafts 21 in the outer rotating structure 2 are respectively fitted onto the cylindrical rollers 13 on both sides of the retainer 11 to form a clamping set that is symmetrical, and the two ends of the connecting rod 22 are respectively inserted into the rod grooves 29 on the opposite side walls of the sleeve shaft 21 to form a preliminary positioning limit;

[0048] Then, the docking seat 23 is embedded into the corresponding fixing groove 28, and the locking blocks 5 at both ends of the docking seat 23 are inserted into the locking groove 4, and the locking blocks 5 pass through both ends of the docking rod 22 to realize the locking and limiting of the docking rod 22. Finally, the docking seat 23 is fixed by countersunk installation of the first bolt 24, so as to realize the symmetrical sleeve connection and fixation of the sleeve shaft 21.

[0049] Then, a side retaining ring 32 is first installed on one end of the inner rotating ring 31 of the inner rotating structure 3 through the second bolt 33. With the side retaining ring 32 in place, the inner rotating ring 31 is inserted into the inner rotating hole 26 of one of the sleeve shafts 21, and after passing through the middle of the inner ring of the cylindrical rotor, it is inserted into the inner rotating hole 26 of the other sleeve shaft 21. Finally, it is fixed on the other end of the inner rotating ring 31 by the second bolt 33. Both side retaining rings 32 are embedded in the inner rotating groove 25 of the sleeve shaft 21 and fit together, so as to achieve the secondary limiting of the sleeve shaft 21 by the side retaining ring 32.

[0050] After installation, the inner wall of the sleeve shaft 21 contacts and supports the outer walls of several cylindrical rollers 13, and the assist groove 27 on the inner wall of the sleeve shaft 21 fits the two ends of the arranged rotating shaft 12, forming an assist fulcrum and limit; while the outer wall of the inner rotating ring 31 contacts and supports the inner wall between the arranged cylindrical rollers 13, thereby enabling the inner rotating ring 31 to form the bearing body through the rotation of the cylindrical rollers 13 relative to the sleeve shaft 21;

[0051] In use, the bearing bodies of multiple assembly shafts can be aligned with each other through the fixing grooves 28 of the sleeve shaft 21 and fixedly spliced ​​by multiple mating seats 23 according to the actual load-bearing requirements, forming a bearing assembly system of 4 rows or 8 rows; and the inner shaft hole diameter and outer shaft diameter used for assembly can be set according to actual requirements.

[0052] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An eight-row cylindrical roller bearing for rolling mills, characterized in that, It includes a guide structure (1), an outer rotating structure (2), and an inner rotating structure (3); the outer rotating structure (2) is detachably mounted on the guide structure (1), and the inner rotating structure (3) is detachably inserted through the middle of the guide structure (1); Among them, the guide structure (1) is used for the connection between the outer rotating structure (2) and the inner rotating structure (3), so that the outer rotating structure (2) can rotate relative to the inner rotating structure (3) through the guide structure (1). The outer rotating structure (2) is used to support and protect the guide structure (1), and the outer rotating structure (2) can be connected relative to the guide structure (1). The inner rotating structure (3) is used to fit the guide structure (1) and the outer rotating structure (2) to form an inner rotating support body. The guiding structure (1) includes a cage (11), a plurality of rotating shafts (12) and a plurality of cylindrical rollers (13); the cage (11) is a ring structure and has a plurality of insertion holes (14) evenly spaced on its side wall; the plurality of rotating shafts (12) are fixedly fixed through the insertion holes (14) of the cage (11); the plurality of cylindrical rollers (13) are movably fitted on both ends of the rotating shafts (12) and are respectively located on both sides of the cage (11) symmetrically. The external rotating structure (2) includes a pair of sleeve shafts (21) and several connecting rods (22); the outer side walls of the left and right ends of the pair of sleeve shafts (21) are symmetrically provided with fixing grooves (28) at equal intervals; the left side wall of the pair of sleeve shafts (21) is provided with rod grooves (29) corresponding to the fixing grooves (28) at equal intervals; the middle of the fixing grooves (28) is provided with locking grooves (4) that penetrate the rod grooves (29); the pair of sleeve shafts (21) are respectively movably fitted onto cylindrical rollers (13), and the sleeve shafts (21) are respectively located on opposite sides of the retainer (11); the two ends of several connecting rods (22) are respectively detachably inserted into the corresponding rod grooves (29) of the sleeve shafts (21), and the two ends of the connecting rods (22) are provided with locking grooves (4) that are the same as the rod grooves (29); The external rotating structure (2) also includes several docking seats (23) and several first bolts (24); Both of the pair of sleeve shafts (21) are cylindrical structures without left side walls, and an inner rotating groove (25) is provided in the middle of the right side wall of the sleeve shaft (21). An inner rotating hole (26) communicating with the sleeve shaft (21) is opened in the middle of the inner rotating groove (25) of the pair of sleeve shafts (21). An annular assisting groove (27) larger than the diameter of the inner rotating hole (26) is opened in the inner right side wall of the pair of sleeve shafts (21). The assisting groove (27) in the pair of sleeve shafts (21) is movably fitted onto the rotating shaft (12). Both ends of the plurality of docking seats (23) are symmetrically provided with protruding locking blocks (5). Both ends of the plurality of docking seats (23) are detachably embedded between the corresponding fixing grooves (28) of the sleeve shaft (21). The locking blocks (5) are inserted into the locking groove (4) and pass through the rod groove (29) and the docking rod (22). The plurality of first bolts (24) pass through both ends of the docking seats (23).

2. The eight-row cylindrical roller bearing for rolling mills according to claim 1, characterized in that, The diameter of the cylindrical roller (13) is greater than the difference in width between the inner and outer diameters of the cage (11).

3. The eight-row cylindrical roller bearing for rolling mills according to claim 2, characterized in that, The first bolt (24) is countersunk and installed with the docking seat (23), and several of the first bolts (24) are screwed into the inner wall of the fixing groove (28).

4. The eight-row cylindrical roller bearing for rolling mills according to claim 3, characterized in that, The inner rotating structure (3) includes an inner rotating ring (31), a pair of side retaining rings (32), and several second bolts (33). The inner rotating ring (31) moves through the cylindrical rollers (13), and the two ends of the inner rotating ring (31) are respectively movably inserted into the inner rotating hole (26) of the sleeve shaft (21). A pair of side retaining rings (32) are respectively detachably placed at both ends of the inner rotating ring (31), and the side retaining rings (32) are respectively movably embedded in the inner rotating groove (25). Several second bolts (33) are respectively countersunk and equidistantly pass through the side retaining rings (32), and are respectively screwed into the side walls at both ends of the inner rotating ring (31).

5. The eight-row cylindrical roller bearing for rolling mills according to claim 4, characterized in that, The right end of the rotating shaft (12) can be spliced ​​by fixing the docking seat (23) with the first bolt (24).

6. The eight-row cylindrical roller bearing for rolling mills according to claim 5, characterized in that, The locking groove (4) is connected to the rotating shaft (12) to facilitate the filling of lubricating oil.

7. An eight-row cylindrical roller bearing for rolling mills according to claim 6, characterized in that, The two ends of the rotating shaft (12) can rotate within the assist groove (27) to realize three support points at both ends of the rotating shaft (12) and the middle of the rotating shaft (12).

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