Double oil film bearing device for rolling mill gearbox and installation adjustment method thereof

Abstract

The application belongs to the technical field of metallurgical equipment, and relates to a double oil film bearing device for a rolling mill gearbox and a mounting and adjusting method thereof. The double oil film bearing device comprises two sliding bearings installed in pairs. The sliding bearings have an inner sleeve and an outer sleeve sleeved on the inner sleeve, and a pressure oil film is arranged between the inner sleeve and the outer sleeve. The two sliding bearings are oppositely installed, the inner sleeves of the two sliding bearings are fixedly sleeved on a transmission shaft in the rolling mill gearbox, and the outer sleeves of the two sliding bearings are fixedly connected in inner holes of rotating members in the rolling mill gearbox, so that the transmission shaft is rotationally connected with the rotating members. The characteristics of the sliding bearings are utilized to avoid the fretting wear of the bearing when the rolling mill gearbox is in the locked state, thereby improving the overall service life of the equipment.

Description

Technical Field

[0001] This invention belongs to the field of metallurgical equipment technology, and relates to a double oil film bearing device for rolling mill gearboxes under high-speed and heavy variable load conditions, and its installation and adjustment method. Background Technology

[0002] As a crucial component of the modular rolling mill's transmission system, the gearbox's service life and operational stability are vital to the mill's overall performance. In existing modular rolling mill gearbox shifting shaft systems, rotating components are often connected to the shaft using two tapered roller bearings. While this ensures even support for the rotating components, when the clutch is relatively fixed to the rotating component (locked state), meaning the component and shaft are rotating synchronously, the inner and outer rings of the load-bearing bearing are relatively stationary, resulting in uneven load distribution. Because modular rolling mills operate under high-speed, heavy-load conditions for extended periods, the locked bearing is prone to fretting wear and failure, impacting the equipment's lifespan.

[0003] Therefore, there is an urgent need for a double oil film bearing device and its installation and adjustment method for rolling mill gearboxes that can be used under high-speed and heavy variable load conditions, in order to solve the problem that bearings in modular rolling mill gearboxes are in a state of fretting wear, which leads to their failure and thus affects the overall lifespan of the equipment. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a double oil film bearing device for rolling mill gearbox and its installation and adjustment method, which utilizes the characteristics of sliding bearings to avoid fretting wear of the bearings, thereby improving the overall service life of the equipment.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A double oil film bearing device for a rolling mill gearbox is characterized by comprising two sliding bearings installed in pairs, each sliding bearing having an inner sleeve and an outer sleeve fitted on the inner sleeve, and a pressure oil film between the inner sleeve and the outer sleeve.

[0007] The two sliding bearings are installed opposite each other, and the inner sleeves of the two sliding bearings are fixedly fitted onto the drive shaft in the rolling mill gearbox. The outer sleeves of the two sliding bearings are fixedly connected to the inner hole of the rotating component in the rolling mill gearbox, so as to rotatably connect the drive shaft and the rotating component.

[0008] Furthermore, the outer sleeve is fixedly connected to the rotating component via an interference fit, and the inner sleeve is fixedly connected to the drive shaft via an interference fit.

[0009] Furthermore, the inner surface of the inner sleeve is provided with an annular oil groove, and the annular oil groove is provided with a plurality of radial oil holes evenly distributed along the circumference. The radial oil holes are provided with tapered flares near the outer sleeve, so as to facilitate the smooth and even injection of lubricating oil into the mating surface of the inner sleeve and the outer sleeve.

[0010] Furthermore, a spacer sleeve is provided between the two sliding bearings and fitted on the transmission shaft. The two ends of the spacer sleeve are respectively connected to the inner sleeves of the two sliding bearings to axially limit the sliding bearings. A flange is provided at the end of the inner sleeve away from the spacer sleeve to axially limit the outer sleeve.

[0011] Furthermore, the inner surface of the outer sleeve is provided with a plurality of axial oil grooves evenly distributed along the circumference, and the side of the outer sleeve that contacts the flange of the inner sleeve is provided with an oil wedge connected to the axial oil groove, so as to lubricate the side contact point when the inner sleeve and the outer sleeve rotate relative to each other.

[0012] Furthermore, the width of the middle section of the axial oil groove is greater than the width of the end sections of the axial oil groove located at both ends of the axial oil groove, so that the oil passage of the axial oil groove is in a state of contraction at both ends.

[0013] Furthermore, the oil wedge has a double diffusion outer surface, namely a first diffusion surface and a second diffusion surface connected to the first diffusion surface. The first diffusion surface is connected to the axial oil groove and has a triangular surface, so that the first diffusion surface can store lubricating oil when supplying oil.

[0014] The second diffusion surface is an inclined surface so that the lubricating oil can flow evenly and widely to the non-diffusion port position.

[0015] Furthermore, the number of axial oil grooves and radial oil holes are different, and they are partially staggered, so that when one of the radial oil holes coincides with the axial oil groove, the remaining radial oil holes are staggered with the axial oil groove.

[0016] A method for installing and adjusting a double oil film bearing device for a rolling mill gearbox includes the following steps:

[0017] a. Press the outer sleeves of two paired sliding bearings through the inner bore of the rotating component in the rolling mill gearbox;

[0018] b. Measure the relative length of the two outer sleeves at both ends, and then grind the spacer according to the measured relative length of the two outer sleeves before installing it on the drive shaft in the rolling mill gearbox, so that the spacer can axially limit the inner sleeves of the two sliding bearings and make the axial clearance of the two sliding bearings within the range of Δ1.

[0019] c. After measuring the actual inner diameter of the two outer sleeves, the outer diameter of the inner sleeve of the corresponding sliding bearing is fitted and ground according to the actual inner diameter of the two outer sleeves before being installed on the drive shaft, so as to ensure that the radial clearance of the two sliding bearings is within the range of Δ2 and Δ3 respectively.

[0020] Limiting Δ1, Δ2, and Δ3 within a reasonable range that allows the two paired sliding bearings to form a pressure oil film, so that the two paired sliding bearings form a pressure oil film between the inner and outer sleeves under a given oil pressure, the installation and adjustment of the double oil film bearing device is completed.

[0021] Furthermore, let the actual inner diameters of the inner sleeves of the two sliding bearings be a and b, respectively. Then, Δ1 is (0.5‰~3‰)(a+b) / 2mm, Δ2 is (0.5‰~3‰)a mm, and Δ3 is (0.5‰~3‰)b mm, so that a pressure oil film is formed between the inner and outer sleeves of the two paired sliding bearings under a given oil pressure.

[0022] The beneficial effects of this invention are as follows:

[0023] 1. The present invention provides a double oil film bearing device for a rolling mill gearbox and its installation and adjustment method. The device uses two sliding bearings installed in pairs, which increases the contact area between the bearing and the rotating parts, and can significantly improve the load-bearing capacity of the transmission shaft system. It is more suitable for the high-speed and heavy-load conditions of the rolling mill gearbox. The characteristics of the sliding bearing are used to avoid the fretting wear of the bearing, thereby improving the overall service life of the equipment.

[0024] 2. This invention employs a double sliding bearing device to ensure that both sides of the rotating component are supported, reducing the impact of off-center load and increasing the stability of the rotating component's operation. Compared with traditional paired tapered roller bearings, the use of sliding bearings can reduce the bearing outer diameter and decrease the linear velocity of the bearing outer sleeve under the same load-bearing capacity, thereby reducing the wear between the outer sleeve and the rotating component and improving the bearing life.

[0025] 3. This invention uses the measured axial and radial dimensions of the outer sleeve of the sliding bearing, and then uses a grinding-fitting installation method for the subsequent installation workpiece based on the measured dimensions. This ensures that the axial and radial clearances of the bearing are within a reasonable range for forming a pressure oil film, thus ensuring that the sliding bearing can form an oil film during operation. The oil film formed in the mating surface separates the contact surfaces of the inner and outer sleeves of the bearing. Furthermore, by optimizing the structure of the inner and outer sleeves of the sliding bearing, axial oil grooves, radial oil holes, and oil wedges are provided, and the number and arrangement of the axial oil grooves and radial oil holes are limited. This allows the sliding bearing to be fully lubricated even when rotating relative to each other, thereby further improving the life of the sliding bearing and the overall life of the equipment.

[0026] Other advantages, objectives, and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination, or may be learned from practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0027] To make the objectives, technical solutions, and advantages of the present invention clearer, the preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, wherein:

[0028] Figure 1 This is a schematic diagram of the structure of a double oil film bearing device for a rolling mill gearbox in one embodiment;

[0029] Figure 2 This is an exploded structural diagram of a double oil film bearing device for a rolling mill gearbox in one embodiment;

[0030] Figure 3 This is a cross-sectional view of the first sliding bearing;

[0031] Figure 4 This is a schematic diagram of the inner sleeve structure;

[0032] Figure 5 This is a sectional view of the inner sleeve;

[0033] Figure 6 for Figure 5 Sectional view of A in the middle;

[0034] Figure 7 This is a structural diagram of the outer garment;

[0035] Figure 8 This is a sectional view of the coat;

[0036] Figure 9 for Figure 8 Sectional view of B;

[0037] Figure 10 This is a side view of the coat;

[0038] Figure 11 for Figure 10 Sectional view of C.

[0039] Reference numerals: 1. Drive shaft; 2. First sliding bearing; 21. First inner sleeve; 22. First outer sleeve; 3. Rotating component; 4. Spacer; 5. Second sliding bearing; 51. Second inner sleeve; 52. Second outer sleeve; 251. Annular oil groove; 252. Radial oil hole; 253. Conical flare; 254. Axial oil groove; 2541. Middle section of axial oil groove; 2542. End section of axial oil groove; 255. Oil wedge; 255. First diffusion surface; 2551. Second diffusion surface; 2552. Flange; 256. Detailed Implementation

[0040] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0041] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual pictures. They should not be construed as limiting the invention. To better illustrate the embodiments of the invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0042] In the accompanying drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components. In the description of the present invention, it should be understood that if terms such as "upper," "lower," "left," "right," "front," and "rear" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing the present invention 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, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting the present invention. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0043] Please see Figures 1 to 11 A double oil film bearing device for a rolling mill gearbox includes two paired sliding bearings. The inner rings of the two sliding bearings are interference-fitted with the same drive shaft 1 in the rolling mill gearbox, and the outer rings of the two sliding bearings are interference-fitted with the inner hole of the same rotating component 3 in the rolling mill gearbox, so as to rotatably connect the rotating component 3 to the drive shaft 1. The two sliding bearings are installed opposite to each other, and a spacer 4 sleeved on the drive shaft 1 is provided between the two sliding bearings.

[0044] Specifically, the two sliding bearings are a first sliding bearing 2 and a second sliding bearing 5 installed opposite to each other, and the first sliding bearing 2 and the second sliding bearing 5 have the same structure, each having an inner sleeve and an outer sleeve fitted on the inner sleeve. The first sliding bearing 2 has a first inner sleeve 21 and a first outer sleeve 22, and the second sliding bearing 5 has a second inner sleeve 51 and a second outer sleeve 52.

[0045] The outer sleeve is connected to the rotating component 3 via an interference fit, and the inner sleeve is connected to the drive shaft 1 via an interference fit. One end of the inner sleeve is provided with a flange 256 to axially position the outer sleeve. The spacer 14 is arranged between the first inner sleeve 21 and the second inner sleeve 51, which can axially position the first inner sleeve 21 and the second inner sleeve 51, and adjust the bearing clearance of the first sliding bearing 2 and the second sliding bearing 5. At the same time, it can deliver lubricating oil to the first sliding bearing 2 and the second sliding bearing 5 located at its two ends.

[0046] Key references Figures 5-6 The inner surface of the inner sleeve is provided with an annular oil groove 251, and a plurality of radial oil holes 252 are evenly distributed in the annular oil groove 251. The ends of the radial oil holes 252 are provided with a conical flare 253 near the outer sleeve. Lubricating oil can be injected smoothly and evenly into the joint surface between the inner sleeve and the outer sleeve along the conical flare 253 and diffuse to all parts of the inner surface of the outer sleeve.

[0047] Key references Figures 7-11 The inner surface of the outer sleeve is provided with a plurality of axial oil grooves 254 evenly distributed circumferentially to achieve uniform distribution of lubricating oil to all parts of the inner surface of the outer sleeve. The width of the middle section 2541 of the axial oil groove 254 is wider than the width of the end sections 2542 of the axial oil groove 254 at both ends, so that the oil passage of the axial oil groove 254 is narrowed at both ends, so as to ensure that a certain amount of lubricating oil can be stored on the contact surface between the outer sleeve and the inner sleeve.

[0048] The side of the outer sleeve that contacts the flange 256 of the inner sleeve is provided with an oil wedge 255 connected to the axial oil groove 254. The oil wedge 255 has a double diffusion outer surface, wherein the first diffusion surface 2551 is connected to the axial oil groove 254 and the first diffusion surface 2551 is a triangular surface to ensure that some of the lubricating oil is stored in the oil expansion port when oil is supplied; the second diffusion surface 2552 is connected to the first diffusion surface 2551 and is an inclined surface to ensure that the lubricating oil can flow evenly and widely to the non-diffusion port position, thereby ensuring lubrication at the side contact point of the flange 256 of the outer sleeve and the inner sleeve when the inner sleeve and the outer sleeve rotate relative to each other.

[0049] Key references Figure 3 Preferably, the number of axial oil grooves 254 and radial oil holes 252 are different and they are partially staggered to ensure that lubrication can be achieved even where there are no axial oil grooves 254 when the inner sleeve and outer sleeve rotate relative to each other, thus avoiding direct contact between the surfaces of the inner sleeve and outer sleeve and causing dry friction, thereby improving the service life of the sliding bearing.

[0050] Furthermore, the number of axial oil grooves 254 is 12, and the number of radial oil holes 252 is 5. They are arranged in a partially staggered manner, such that when one of the radial oil holes 252 coincides with the axial oil groove 254, the remaining radial oil holes 252 are staggered with the axial oil groove 254.

[0051] Key references Figures 1-2 A method for installing and adjusting a double oil film bearing device for a rolling mill gearbox includes the following steps:

[0052] 1. First, fix the first outer sleeve 22 and the second outer sleeve 52 to the designated mounting position in the inner hole of the rotating part 3 by interference fit. Then, after measuring the relative length f of the ends of the first outer sleeve 22 and the second outer sleeve 52 away from each other, grind the length of the spacer 4 according to the dimension f and then install it on the drive shaft 1 to the designated mounting position for the spacer 4, so as to axially limit the inner sleeve. On the basis of the flange 256 on the inner sleeve axially limiting the outer sleeve, it is ensured that after the first inner sleeve 21 and the second inner sleeve 51 are installed, the axial clearance of the paired first sliding bearing 2 and the second sliding bearing 5 is Δ1, so that f + Δ1 = the flange 256 of the first inner sleeve 21 is close to the first inner sleeve 51. The distance between one side of the outer sleeve 22 and the side of the flange 256 of the second inner sleeve 51 that is close to the second outer sleeve 52 is c = f + Δ1 - the distance between the side of the flange 256 of the first inner sleeve 21 that is close to the first outer sleeve 22 and the side of the first inner sleeve 21 that is away from the flange 256 - the distance between the side of the flange 256 of the second inner sleeve 51 that is close to the second outer sleeve 52 and the side of the second inner sleeve 51 that is away from the flange 256. The distance between the side of the flange 256 of the first inner sleeve 21 that is close to the first outer sleeve 22 and the side of the first inner sleeve 21 that is away from the flange 256, and the distance between the side of the flange 256 of the second inner sleeve 51 that is close to the second outer sleeve 52 and the side of the second inner sleeve 51 that is away from the flange 256 are both fixed values.

[0053] 2. Then, after measuring the actual inner diameters a and b of the first inner sleeve 22 and the second inner sleeve 52 respectively, the outer surfaces of the first inner sleeve 21 and the second outer sleeve 22 are ground to make their actual outer diameters d and e before installation, thereby ensuring that the radial clearance values ​​of the first sliding bearing 2 and the second sliding bearing 5 are Δ2 and Δ3 respectively, where ad = Δ2 and be = Δ3.

[0054] The ranges of Δ1, Δ2 and Δ3 are (0.5‰~3‰)(a+b) / 2mm, (0.5‰~3‰)a, and (0.5‰~3‰)b mm, respectively.

[0055] By limiting the axial clearance of the paired sliding bearings formed by the first sliding bearing 2 and the second sliding bearing 5 to within the range of Δ1, and the radial clearance values ​​of the first sliding bearing 2 and the second sliding bearing 5 to within the ranges of Δ2 and Δ3 respectively, it is ensured that the lubricating oil can form an oil film between the inner and outer sleeves under a given oil pressure, avoiding dry friction at the inner and outer sleeve contact point, that is, avoiding the sliding bearings in the locked state from working in a state of fretting wear, thereby improving the overall service life of the equipment.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A double oil film bearing device for a rolling mill gearbox, characterized in that: It includes two sliding bearings installed in pairs, each sliding bearing having an inner sleeve and an outer sleeve fitted on the inner sleeve, and a pressure oil film between the inner sleeve and the outer sleeve; The two sliding bearings are installed opposite each other, and the inner sleeves of the two sliding bearings are fixedly sleeved on the drive shaft in the rolling mill gearbox. The outer sleeves of the two sliding bearings are fixedly connected to the inner hole of the rotating part in the rolling mill gearbox, so as to rotatably connect the drive shaft and the rotating part. The inner surface of the inner sleeve is provided with an annular oil groove, and the annular oil groove is provided with a number of radial oil holes evenly distributed in the circumference. The radial oil holes are provided with a tapered flare near the outer sleeve, so as to smoothly and evenly inject lubricating oil into the mating surface of the inner sleeve and the outer sleeve. A spacer sleeve is provided between the two sliding bearings and fitted on the drive shaft. The two ends of the spacer sleeve are respectively connected to the inner sleeve of the two sliding bearings to axially limit the sliding bearings. A flange is provided at the end of the inner sleeve away from the spacer sleeve to axially limit the outer sleeve. The inner surface of the outer sleeve is provided with a number of axial oil grooves evenly distributed in the circumferential direction, and the side of the outer sleeve that contacts the flange of the inner sleeve is provided with an oil wedge connected to the axial oil groove, so as to lubricate the side contact point when the inner sleeve and the outer sleeve rotate relative to each other. The width of the middle section of the axial oil groove is greater than the width of the end sections of the axial oil groove located at both ends of the axial oil groove, so that the oil passage of the axial oil groove is in a state of contraction at both ends. The oil wedge has a double diffusion outer surface, namely a first diffusion surface and a second diffusion surface connected to the first diffusion surface. The first diffusion surface is connected to the axial oil groove and has a triangular surface so that the first diffusion surface can store lubricating oil when supplying oil. The second diffusion surface is an inclined surface so that the lubricating oil can flow evenly and widely to the non-diffusion port position; The number of axial oil grooves and radial oil holes are different, and they are partially staggered, so that when one of the radial oil holes coincides with the axial oil groove, the remaining radial oil holes are staggered with the axial oil groove.

2. The double oil film bearing device for a rolling mill gearbox according to claim 1, characterized in that: The outer sleeve is fixedly connected to the rotating component via an interference fit, and the inner sleeve is fixedly connected to the drive shaft via an interference fit.

3. A method for installing and adjusting a double oil film bearing device for a rolling mill gearbox as described in claim 1, characterized in that, Includes the following steps: a. Press the outer sleeves of two paired sliding bearings through the inner bore of the rotating component in the rolling mill gearbox; b. Measure the relative length of the two outer sleeves at both ends, and then grind the spacer according to the measured relative length of the two outer sleeves before installing it on the drive shaft in the rolling mill gearbox, so that the spacer can axially limit the inner sleeves of the two sliding bearings and make the axial clearance of the two sliding bearings within the range of Δ1. c. After measuring the actual inner diameter of the two outer sleeves, the outer diameter of the inner sleeve of the corresponding sliding bearing is fitted and ground according to the actual inner diameter of the two outer sleeves before being installed on the drive shaft, so as to ensure that the radial clearance of the two sliding bearings is within the range of Δ2 and Δ3 respectively. Limiting Δ1, Δ2, and Δ3 within a reasonable range that allows the two paired sliding bearings to form a pressure oil film, so that the two paired sliding bearings can form a pressure oil film between the inner and outer sleeves under a given oil pressure, the installation and adjustment of the double oil film bearing device is completed; Let the actual inner diameters of the inner sleeves of the two sliding bearings be a and b, respectively. Then, Δ1 is (0.5‰~3‰)(a+b) / 2mm, Δ2 is (0.5‰~3‰)a mm, and Δ3 is (0.5‰~3‰)b mm, so that a pressure oil film is formed between the inner and outer sleeves of the two paired sliding bearings under a given oil pressure.

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