Large mill bearing bush repairing structure
By using clamp components, fine-tuning clamp components and clearance adjustment components to repair the deformation of the hollow bearing bush of the mill, the problem of burning the tile accident during heavy load start-up is solved, and the planeness and floating quantity parameters of the bearing bush are matched. Reduced repair costs.
Patent Information
- Application Number
- CN202420218836.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-30
- Publication Date
- 2025-02-14
- Estimated Expiration
- 2034-01-30
AI Technical Summary
The existing mill hollow bearing lubrication system is prone to tile burning accidents when starting with heavy load, resulting in serious deformation of the bearing shell, which is difficult to meet the plane degree and float parameter requirements, and is difficult to repair and usually needs to be replaced.
Plywood components, fine-tuning plywood components and clearance adjustment components are used to clamp the deformation of the bearing shell through the plywood assembly, magnetic drilling is fixed on the plywood, drilling countershot holes and adjusting the gap to ensure that the gap between the bearing shell and the back of the tile complies with technical parameters.
The repaired bearing shells meet the plane degree parameter requirements, and ensure that the floating parameter value of the hollow shaft meets the manufacturer's technical parameters, avoiding tile burning accidents and reducing the economic burden of the enterprise.
Smart Images
Figure CN222470811U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of mill bearing bush repairing, and specifically relates to a large mill bearing bush repairing structure. Background Art
[0002] The mill hollow shaft bearing lubrication system consists of two self-positioning 120° hydrostatic lubricated high-lead bronze sliding bearings. Each bearing has four high-pressure oil circuits to supply oil to the bearing oil groove, providing an uninterrupted hydrostatic suspension oil cushion for mill startup and operation. In terms of bearings, the biggest improvement is the use of multiple support oil grooves. There are now two side-by-side hydrostatic oil grooves on each side of the bearing. High-pressure oil is delivered to each oil groove separately, which provides a more uniform lifting force along the width of the hollow shaft, thereby improving the overall stability of the bearing. The mill hollow shaft bearing lubrication system is interlocked with the mill startup circuit and adopts the principle of fluid static design to continuously pump high-pressure oil into the bearing seat, thereby jacking up and lubricating the hollow shaft, which can provide comprehensive protection for the bearing.
[0003] However, the current mill hollow shaft bearing lubrication system cannot be started under heavy load. When the power grid is unexpectedly powered off or the mill stops due to a fault, the mill needs to be cleaned of materials and steel balls. If the materials and steel balls are not cleaned properly, the start-up process is prone to burning of bearings, causing the copper bearings to be severely deformed by heat, and the shape and size accuracy parameters of the bearing parts are seriously exceeded and cannot be used. In order to ensure the normal use of the bearing, the bearing and the hollow shaft journal are completely non-contacting, and a stable oil film can only be formed during operation through the high-pressure oil lubrication system, and the oil film must be no less than 0.2mm. If the bearing is uneven or partially deformed, it will affect the thickness of the oil film and increase the risk of burning. Therefore, the various technical requirements for the bearing are high, and the difficulty of repairing the bearing is also increased. Even if it is repaired, it is difficult to ensure the flatness parameter requirements of the copper bearing. After installation and use, it is difficult to meet the floating amount parameter value requirements of the hollow shaft. According to the original technical regulations, once the bearing shaft is deformed, it can only be replaced, which undoubtedly increases the economic burden of the enterprise. Summary of the invention
[0004] In order to overcome the problems existing in the background technology, the utility model provides a large-scale mill bearing repair structure, which can make the repaired bearing meet the flatness parameter requirements and ultimately ensure the floating parameter value requirements of the hollow shaft. After the repaired bearing is installed, the parameter values of each part can meet the manufacturer's mill technical parameter requirements. After repair, it can operate normally, and all parameter values of the mill operate normally during operation.
[0005] To achieve the above purpose, the utility model is implemented through the following technical solutions:
[0006] The large mill bearing repair structure includes a bearing, a splint assembly and a magnetic drill; the splint assembly includes two splints, an adjusting screw and an adjusting nut; the two splints are opposite to each other and clamped on the inner and outer sides of the bearing along the axial direction of the bearing, the length of the splint is greater than the axial length of the bearing, the two ends of the two splints are respectively connected by adjusting screws, and the adjusting nuts are connected to the adjusting screws; the splint is made of ordinary steel, and the magnetic drill is installed and fixed on the splint located on the inner side.
[0007] Preferably, the clamping plate is parallel to the axis of the bearing bush.
[0008] Preferably, the large mill bearing repair structure also includes a fine-tuning clamping plate assembly; the fine-tuning clamping plate assembly includes two fine-tuning clamping plates, a fine-tuning screw and a fine-tuning nut; the two fine-tuning clamping plates are opposite to each other and clamped on the inner and outer sides of the bearing along the axial direction of the bearing, the length of the fine-tuning clamping plate is greater than the axial length of the bearing, the two ends of the two fine-tuning clamping plates are respectively connected by fine-tuning screws, and the fine-tuning nuts are connected to the fine-tuning screws.
[0009] Preferably, the large mill bearing repair structure further comprises a gap adjustment assembly; the gap adjustment assembly comprises an n-type plate and a pressure dispersion plate; the n-type plate is vertically clamped at the end of the bearing; the pressure dispersion plate is clamped between the n-type plate and the bearing.
[0010] Preferably, the bearing shell comprises a bearing shell body and a shell back; the bearing shell body and the shell back are concentric, and the shell back is closely attached to the outer side of the bearing shell body.
[0011] Preferably, a countersunk hole is provided on the bearing shell, and the countersunk hole penetrates the bearing shell body but does not penetrate the shell back.
[0012] Preferably, the countersunk holes are distributed in a straight line along the axial direction of the bearing shell.
[0013] Beneficial effects of the utility model:
[0014] The utility model realizes the repair and adjustment of the bearing shaft deformation by arranging a clamping plate assembly, a fine-tuning clamping plate assembly and a gap adjustment assembly, so that the repaired bearing can meet the flatness parameter requirements and can ultimately ensure the floating parameter value requirements of the hollow shaft. After the repaired bearing is installed, it is tested that the parameter values of each part can meet the technical parameter requirements of the manufacturer's mill and can operate normally after the repair. The parameter values of the mill operate normally during operation, which solves the current situation that the bearing shaft can only be replaced after deformation, saving the company's economic investment. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 It is a side view of the utility model;
[0016] Figure 2 yes Figure 1 A local enlarged view of point A;
[0017] Figure 3 yes Figure 1 A top view of
[0018] Figure 4 It is a schematic diagram of the n-type plate structure of the utility model;
[0019] In the figure, 1-bearing, 11-bearing body, 12-bearing back, 2-clamp, 3-adjusting screw, 4-adjusting nut, 5-fine-tuning clamp, 6-fine-tuning screw, 7-fine-tuning nut, 8-n-type plate, 9-pressure dispersion plate. DETAILED DESCRIPTION
[0020] In order to make the purpose, technical solution and beneficial effects of the present invention clearer, the preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings to facilitate understanding by technicians.
[0021] In the description of the present invention, unless otherwise specified, the terms "inside", "outside", etc., indicating the orientation or state relationship, are based on the orientation or state relationship shown in the drawings, and 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, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.
[0022] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "provided with" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention will be understood according to specific circumstances.
[0023] like Figure 1-4 As shown, the large mill bearing repair structure includes a bearing 1, a clamping plate assembly, a fine-tuning clamping plate assembly, a magnetic drill and a gap adjustment assembly. The bearing 1 includes a bearing body 11 and a bearing back 12, and the bearing body 11 and the bearing back 12 are conventional connection structures: the bearing body 11 and the bearing back 12 are coaxial, and the bearing back 12 is close to the outer side of the bearing body 11.
[0024] The splint assembly includes two splints 2, an adjusting screw 3 and an adjusting nut 4. The two splints 2 are opposite to each other and clamped on the inner and outer sides of the bearing shell 1 along the axial direction of the bearing shell 1. The length of the splint 2 is greater than the axial length of the bearing shell 1. The two ends of the two splints 2 are respectively connected by the adjusting screw 3, and the adjusting nut 4 is connected to the adjusting screw 3. The splint 2 is made of ordinary steel, and the magnetic drill is installed and fixed on the splint 2. The splint assembly is used to adjust the deformation of the bearing shell 1, specifically: the splint 2 is clamped axially at the deformed position of the bearing shell 1, the two splints 2 are connected with the adjusting screw 3, and then the adjusting nut 4 is connected to the adjusting screw 3, and the adjusting nut 4 is twisted to make the two splints 2 clamp the bearing shell 1. The material of the bearing back 12 is relatively hard and not easy to deform. The deformation is mainly caused by the bearing body 11. By clamping the bearing 1 with the clamp assembly, the deformed bearing body 11 is close to the bearing back 12. Due to the high hardness of the bearing back 12, the shape will remain unchanged. When the bearing body 11 is close to the bearing back 12, the deformation of the bearing body 11 is adjusted while reducing the deformation gap between the bearing body 11 and the bearing back 12. The clamp 2, on the one hand, presses the bearing body 11 at the deformed part close to the bearing back 12 so that the gap between the bearing body 11 and the bearing back 12 meets the requirements. On the other hand, it is used to fix the magnetic drill. Fix the magnetic drill on the clamp 2, and drill countersunk holes on the bearing 1 along the clamp 2. Drill a countersunk hole at both ends and the middle of the bearing 1. The countersunk holes are evenly arranged and try to be distributed in a straight line. Drill through the bearing body 11 first, and then continue to drill the bearing back 12 after the bearing body 11 is drilled through. The bearing back 12 cannot be drilled through. The clamping plate 2 is parallel to the axis of the bearing shell 1, and provides a reference for the distribution of the countersunk holes when drilling the countersunk holes, so that the countersunk holes are in a straight line.
[0025] The gap adjustment assembly includes an n-type plate 8 and an adjustment gasket 9. The n-type plate 8 is vertically clamped at the end of the bearing 1, and the pressure dispersion plate 9 is clamped between the n-type plate 8 and the bearing 1. The adjustment gasket 9 has two main functions. The first is to reduce the local pressure of the n-type plate 8 on the bearing body 11. Since the bearing body 11 is made of copper, which is a relatively soft material, and the n-type plate 8 is a steel plate with relatively high hardness, if the n-type plate 8 is directly clamped on the bearing 1, it is easy to produce indentations or grooves on the bearing body 11. By setting the adjustment gasket 9, the generation of indentations or grooves can be avoided, and the damage to the bearing body 11 can be avoided; the second is that the adjustment gasket 9 can be used to fine-tune the gap between the bearing body 11 and the bearing back 12. If the gap between the bearing body 11 and the bearing back 12 is too large, the number of adjustment gaskets 9 can be increased to increase the overall thickness of the adjustment gasket, squeeze the bearing body 11 and the bearing back 12, and reduce the gap between the two, so as to repair the deformation of the bearing body 11. The width of the n-type plate 8 is slightly wider than the total thickness of the bearing body 11 and the bearing back 12 so that the adjusting gasket 9 can be inserted into and adjust the gap between the bearing body 11 and the bearing back 12 .
[0026] As a preferred solution, the large mill bearing repair structure further includes a fine-tuning clamping plate assembly. The fine-tuning clamping plate assembly includes two fine-tuning clamping plates 5, a fine-tuning screw 6 and a fine-tuning nut 7. The two fine-tuning clamping plates 5 are opposite to each other and clamped on the inner and outer sides of the bearing 1 along the axial direction of the bearing 1. The length of the fine-tuning clamping plates 5 is greater than the axial length of the bearing 1. The two ends of the two fine-tuning clamping plates 5 are respectively connected by the fine-tuning screw 6, and the fine-tuning nut 7 is connected to the fine-tuning screw 6. The fine-tuning clamping plate assembly is mainly used to fine-tune the micro-deformation of the bearing. The specific adjustment method is: place two fine-tuning clamping plates 5 opposite to each other and reinforce them at the slightly deformed part of the bearing 1. Use a fine-tuning screw 6 to connect the two ends of the two fine-tuning clamping plates 5. Then connect the fine-tuning nut 7 to the fine-tuning screw 6. Twist the fine-tuning nut 7 to clamp the two fine-tuning clamping plates 5 at the micro-deformation of the bearing 1. Under the action of the clamping force, the deformed bearing body 11 is brought close to the bearing back 12 to adjust the micro-deformation of the bearing body 11.
[0027] Processing and working process of this utility model:
[0028] (1) Use fine sandpaper to grind the burned part of the bearing, use a knife-edge ruler to check the surface flatness of the bearing, and grind the convex points of the bearing.
[0029] (2) Produce splint assemblies, fine-tuning splint assemblies, and gap adjustment assemblies.
[0030] (3) Use the clamping plate assembly to clamp the bearing shell where the deformation is large. Fix the magnetic drill on the clamping plate 2 and use the magnetic drill to drill three countersunk holes on the bearing shell body 11. First drill through the bearing shell body 11. After the bearing shell body 11 is drilled through, continue to drill the shell back 12. The shell back 12 cannot be drilled through.
[0031] Then use a tap to tap the countersunk hole, and finally use self-tapping screws to fix the bearing body 11 to the bearing back 12. By connecting the bearing shaft body 11 and the bearing back 12 with self-tapping screws, and utilizing the connecting force of the self-tapping screws, the deformed part of the bearing body 11 is made close to the bearing back 12, thereby realizing the correction of the deformed and twisted part of the bearing shaft body 1. After the correction is completed, measure the gap between the bearing body 11 and the bearing back 12 to ensure that the gap between the two meets the technical parameter requirements.
[0032] (4) Remove the magnetic drill and check whether the technical parameters (bearing body 11 and bearing back 12, and flatness of bearing body 11) meet the requirements.
[0033] (5) Use fine sand to grind the contact point of the hollow shaft to ensure the floating amount of the hollow shaft.
[0034] (6) Reinstall the repaired bearing body 11 and bearing back 12, measure various parameters, compare with the original data, measure the floating amount and the oil pressure at each point of the hollow shaft, and ensure that the repaired bearing meets the various technical parameters for the start-up of the mill.
[0035] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the utility model.
Claims
1. A large mill bearing repair structure, characterized in that: The invention comprises a bearing shell (1), a clamping plate assembly and a magnetic drill; the clamping plate assembly comprises two clamping plates (2), an adjusting screw (3) and an adjusting nut (4); the two clamping plates (2) are opposite to each other and are clamped on the inner and outer sides of the bearing shell (1) along the axial direction of the bearing shell (1); the length of the clamping plates (2) is greater than the axial length of the bearing shell (1); the two ends of the two clamping plates (2) are respectively connected by the adjusting screw (3); the adjusting nut (4) is connected to the adjusting screw (3); the material of the clamping plates (2) is steel, and the magnetic drill is installed on the clamping plates (2) located on the inner side.
2. The large mill bearing bush repair structure according to claim 1 is characterized in that: The clamping plate (2) is parallel to the axis of the bearing bush (1).
3. The large mill bearing bush repair structure according to claim 2 is characterized in that: The invention also comprises a fine-tuning clamping plate assembly; the fine-tuning clamping plate assembly comprises two fine-tuning clamping plates (5), a fine-tuning screw rod (6) and a fine-tuning nut (7); the two fine-tuning clamping plates (5) are opposite to each other and clamped on the inner and outer sides of the bearing bush (1) along the axial direction of the bearing bush (1); the length of the fine-tuning clamping plates (5) is greater than the axial length of the bearing bush (1); the two ends of the two fine-tuning clamping plates (5) are respectively connected by the fine-tuning screw rod (6); and the fine-tuning nut (7) is connected to the two ends of the fine-tuning screw rod (6).
4. The large mill bearing bush repair structure according to claim 3 is characterized in that: It also includes a gap adjustment component; the gap adjustment component includes an n-type plate (8) and a pressure dispersion plate (9); the n-type plate (8) is vertically clamped at the end of the bearing bush (1); and the pressure dispersion plate (9) is clamped between the n-type plate (8) and the bearing bush (1).
5. The large mill bearing bush repair structure according to any one of claims 1 to 4, characterized in that: The bearing shell (1) comprises a bearing shell body (11) and a shell back (12); the bearing shell body (11) and the shell back (12) are coaxial, and the shell back (12) is in close contact with the outer side of the bearing shell body (11).
6. The large mill bearing bush repairing structure according to claim 5 is characterized in that: The bearing bush (1) is provided with a countersunk hole, which passes through the bearing bush body (11) but does not penetrate the bush back (12).
7. The large mill bearing bush repairing structure according to claim 6 is characterized in that: The countersunk holes are distributed in a straight line along the axial direction of the bearing shell (1).