A white metal stern tube bearing for a marine vessel

Abstract

The application relates to a ship stern tube white alloy bearing which comprises an outer ring, an inner ring and rolling elements, fixing columns, connecting plates, threaded rods, limiting plates, movable blocks, clamping plates, rotating plates, pressing elements and fixed plates, and the movable blocks are separated from the limiting plates by moving the movable blocks, the clamping plates are flipped and adjusted, the fixed plates are limited by rotating the pressing elements and cooperating with the rotating mechanism, and the rotating plates press the fixed pressing elements. The adjusting mechanism based on the principle of the threaded rods and the inclined pressing plates is arranged on the outer ring. By simply rotating the threaded rods, the outer ring of the bearing can be driven to produce accurate and small angle deflection around the connecting point, so that the installation axis deviation is directly and efficiently compensated. The adjusting operation can greatly reduce the installation difficulty, shorten the working hours and save the cost.

Description

Technical Field

[0001] This invention relates to the field of bearing technology, specifically to a white alloy bearing for ship stern tubes. Background Technology

[0002] The stern tube bearing is a key component supporting the stern shaft, and its installation accuracy directly affects the alignment and operational stability of the shafting system. Currently, the vast majority of ship stern tube white alloy bearings adopt a completely fixed installation method, that is, the outer ring of the bearing is rigidly connected to the stern tube structure of the hull by bolts, and the installation angle is determined at the time of installation, without any on-site adjustment capability.

[0003] This fixed structure reveals significant drawbacks in practical applications: First, during ship construction or maintenance, factors such as hull deformation, section assembly errors, and base machining deviations are unavoidable, leading to a slight angular deviation between the theoretical axis of the bearing mounting base and the actual required axis. Fixed bearings cannot compensate for this deviation and can only achieve a rough alignment through cumbersome shim adjustments or even secondary machining of the base, resulting in complex, inefficient, and costly installation processes. Second, even with a good initial installation, the hull structure may undergo slight deformation after long-term operation, causing the actual operating angle of the bearing to deviate from the ideal state and accelerating bearing wear.

[0004] Therefore, a white alloy bearing for ship stern tubes is proposed to address the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a white alloy bearing for a ship stern tube.

[0006] The objective of this invention is achieved through the following technical solution: a white alloy bearing for a ship's stern tube, comprising: an outer ring, an inner ring, and a rolling element located between the outer ring and the inner ring. A fixed post is fixedly connected to the outer ring, a connecting plate is provided at the end of the fixed post, a threaded rod is rotatably connected to the fixed post, a limiting plate is provided on the fixed post, a movable block that is threadedly connected to the threaded rod is slidably fitted on the limiting plate, a retaining plate is fixedly connected to the movable block, and the retaining plate is slidably fitted with the limiting plate. By moving the movable block away from the limiting plate, the movable plate can be flipped and adjusted. It also includes a rotating plate and a pressing component that presses against the connecting plate. The pressing component has a movable groove in the middle, and the movable block moves in the movable groove. The end of the rotating plate is rotatably connected to a sliding groove, and a fixed plate that slidably engages with the threaded rod is located in the sliding groove. The rotating plate and the pressing component press against each other. By rotating the pressing component in conjunction with the rotating mechanism, the fixed plate restricts the threaded rod while the rotating plate presses against the fixed pressing component.

[0007] As a further description of the above technical solution: A connecting sleeve is fitted onto the fixed column located at the top. The threaded rod is rotatably connected to the connecting sleeve. The limiting plate is connected and fixed to the connecting sleeve. An installation hole is provided on the fixed column.

[0008] As a further description of the above technical solution: Two inclined pressure plates are fixedly connected to the side of the connecting plate located at the upper position, and the two inclined pressure plates are in abutting fit with the two ends of the pressing member.

[0009] As a further description of the above technical solution: The movable block has a sliding groove that slides with the pressing member, and the edge of the pressing member that contacts the inclined pressure plate has an arc-shaped structure.

[0010] As a further description of the above technical solution: The fixing plate is composed of a vertical plate and an inclined plate connected and fixed together, and an adhesive plate that is in contact with the pressing part is fixedly connected to the vertical plate.

[0011] As a further description of the above technical solution: The rotating mechanism includes a connecting plate that is fixed to the card plate. The connecting plate has a mating groove. The fixed plate moves within the mating groove. The end of the rotating plate abuts against the connecting plate. A compression spring is connected between the fixed plate and the connecting plate.

[0012] As a further description of the above technical solution: A rotating shaft is fixedly connected inside the groove, and the rotating shaft moves through the end of the fixed plate.

[0013] As a further description of the above technical solution: The width of the groove and the mating groove is greater than the width of the vertical plate.

[0014] As a further description of the above technical solution: The rotating plate has an overlap groove at its end, which is pressed against the pressing member. The contact surface between the overlap groove and the pressing member is treated with anti-slip treatment.

[0015] As a further description of the above technical solution: The fixed plate is provided with a pressing groove. The end of the pressing groove near the rotating plate is inclined. Multiple pressing columns are fixedly connected in the groove, and the pressing columns are pressed against the fixed plate.

[0016] As a further description of the above technical solution: Compared with the prior art, the advantages of the present invention are as follows: 1. This invention creatively incorporates an adjustment mechanism based on the principle of a threaded rod and inclined pressure plate on the outer ring. The threaded rod engages with the threaded hole at the center of the movable block. Because the movable block is constrained by the limiting plate, it can only slide linearly and cannot rotate. When the movable block moves linearly, it drives the rigidly connected pressing member at its front end to move synchronously. Both ends of the pressing member contact the inclined surfaces of two inclined pressure plates fixed to the connecting plate. Through the movable block, limiting plate, connecting sleeve, etc., the force is ultimately transmitted to the fixed column, thereby locking the current angle. This method enables adjustment.

[0017] 2. Through the uniquely designed flip-up movable block and pressing component structure, the operator can quickly change the effective direction of the pressing component without disassembling any major components, thereby enabling the same mechanism to achieve bearing tilt adjustment in different directions. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a side view of the overall structure of the present invention; Figure 3 This is a schematic diagram of the cooperation structure between the connecting plate and the fixing column located at the top position of the present invention; Figure 4 This is a schematic diagram of the mating structure of the inclined pressure plate and the pressing member of the present invention; Figure 5 This is a schematic diagram of the disassembled structure of the inclined pressure plate and the pressing member of the present invention; Figure 6 This is a schematic diagram of the disassembled structure of the fixing column and connecting sleeve of the present invention; Figure 7 This is a schematic diagram of the cooperative structure between the movable block and the pressing member of the present invention; Figure 8 This is a side view schematic diagram of the mating structure of the movable block and the pressing member of the present invention; Figure 9 This is a schematic diagram showing the disassembled structure of the movable block and the pressing member of the present invention; Figure 10 This is a cross-sectional structural diagram of the pressing member of the present invention; Figure 11 This is a schematic diagram of the cooperative structure of the card plate, the limiting plate, and the movable block of the present invention; Figure 12 This is a schematic diagram of the disassembled structure of the card plate and the movable block of the present invention; Figure 13 This is a cross-sectional structural diagram of the connecting plate of the present invention; Figure 14 This is the invention Figure 13 Top view of the structure; Figure 15This is a schematic diagram of the cooperation structure of the vertical plate, connecting plate, and rotating shaft of the present invention.

[0019] Labeling Explanation: 1. Outer Ring; 2. Fixed Post; 3. Connecting Plate; 4. Threaded Rod; 5. Limiting Plate; 6. Movable Block; 7. Clamping Plate; 8. Rotating Plate; 9. Pressing Component; 10. Movable Groove; 11. Sliding Groove; 12. Fixed Plate; 1201. Vertical Plate; 1202. Inclined Plate; 1203. Adhesive Plate; 13. Connecting Sleeve; 14. Mounting Hole; 15. Inclined Pressure Plate; 16. Sliding Groove; 17. Connecting Plate; 18. Mating Groove; 19. Compression Spring; 20. Rotating Shaft; 21. Overlap Groove; 22. Pressing Groove; 23. Pressing Post. Detailed Implementation

[0020] The present invention will now be described in detail with reference to the accompanying drawings and embodiments: like Figures 1-15 The diagram shows an embodiment of a white alloy bearing for a ship's stern tube provided by the present invention, including: an outer ring 1, an inner ring, and a rolling element located between the outer ring 1 and the inner ring. A fixed post 2 is fixedly connected to the outer ring 1. A connecting plate 3 is provided at the end of the fixed post 2. A threaded rod 4 is rotatably connected to the fixed post 2. A limiting plate 5 is provided on the fixed post 2. A movable block 6 that is threadedly connected to the threaded rod 4 is slidably fitted on the limiting plate 5. A retaining plate 7 is fixedly connected to the movable block 6. The retaining plate 7 is slidably fitted with the limiting plate 5. By moving the movable block 6 to disengage from the limiting plate 5, the movable plate can be flipped and adjusted. It also includes a rotating plate 8 and a pressing member 9 that abuts against the connecting plate 3. The pressing member 9 has a movable groove 10 in the middle, and the movable block 6 moves in the movable groove 10. The end of the rotating plate 8 is rotatably connected to a sliding groove 11. A fixed plate 12 that slidably engages with the threaded rod 4 is located in the sliding groove 11. The rotating plate 8 and the pressing member 9 abut against each other. By rotating the pressing member 9 in conjunction with the rotating mechanism, the fixed plate 12 restricts the threaded rod 4 while the rotating plate 8 presses against the fixed pressing member 9.

[0021] A connecting sleeve 13 is fitted onto the fixed column 2 located at the top. The threaded rod 4 is rotatably connected to the connecting sleeve 13. The limiting plate 5 is connected and fixed to the connecting sleeve 13. The fixed column 2 has a mounting hole 14. The connecting sleeve 13 serves as the carrier of the core adjustment module. Both the threaded rod 4 and the limiting plate 5 are mounted on it. When angle adjustment is required, the entire connecting sleeve 13 module is fitted onto the fixed column 2. When not required, traditional rigid installation can be performed directly using the mounting hole 14 on the fixed column 2.

[0022] The connecting plate 3 located at the upper position has two inclined pressure plates 15 fixedly connected to its side. The two inclined pressure plates 15 are in abutting fit with the two ends of the pressing member 9. The connecting plate 3 located at the lower position is movably inserted into the fixed column 2. The connecting plate 3 located at the upper position is inserted into the fixed column 2 (after installation, the connecting plate 3 located at the upper position and the fixed column 2 cannot rotate relative to each other). The top of the fixed column 2 located at the upper position has a polygonal structure. The groove opened inside the connecting sleeve 13 has a polygonal structure. The insertion groove opened on the connecting plate 3 located at the upper position is a circular groove (the polygonal structure rotates within the circular groove). This allows the fixed column 2 and the connecting sleeve 13 to rotate on the connecting plate 3 after being inserted into each other. The interaction mechanism between the pressing member 9 and the connecting plate 3 is clearly defined. The two inclined pressure plates 15 form a V-shaped or wedge-shaped guide surface. When the pressing member 9 moves between them, the normal component of the inclined surface is directly converted into a radial force that drives the bearing to deflect.

[0023] Furthermore, the movable block 6 is provided with a sliding groove 16 that slides with the pressing member 9. The edge of the pressing member 9 that contacts the inclined pressure plate 15 has an arc-shaped structure. The sliding groove 16 allows the pressing member 9 to have a certain amount of movement on the movable block 6 (especially during flipping and initial alignment). The arc-shaped structure at the end of the pressing member 9 facilitates its sliding between the two inclined pressure plates 15, playing a guiding and centering role.

[0024] It is worth noting that the fixing plate 12 is composed of a vertical plate 1201 and an inclined plate 1202 connected and fixed. A bonding plate 1203 that presses against the pressing member 9 is fixedly connected to the vertical plate 1201. The fixing plate 12 adopts a special "L" shape or similar structure (vertical plate 1201 and inclined plate 1202). The vertical plate 1201 is used for connection and guidance. The inclined surface of the inclined plate 1202 eventually contacts and presses against the thread or rod body of the threaded rod 4. The bonding plate 1203 is a protrusion on the vertical plate 1201, which is used to increase the contact area with the pressing member 9 or to apply pressure in a specific direction.

[0025] The rotating mechanism includes a connecting plate 17 fixedly connected to the clamping plate 7. A mating groove 18 is provided on the connecting plate 17, and a fixed plate 12 moves within the mating groove 18. The end of the rotating plate 8 presses against the connecting plate 17. A compression spring 19 is connected between the fixed plate 12 and the connecting plate 17. The compression spring 19 is always in a compressed state. When the rotating plate 8 is rotated, the movement of its end is transmitted to the fixed plate 12 through the rotating shaft 20 in the sliding groove 11. The fixed plate 12 moves and swings within the mating groove 18 of the connecting plate 17. The compression spring 19 provides a continuous preload, causing the inclined plate 1202 of the fixed plate 12 to tend to press against the threaded rod 4, and causing the rotating plate 8 to tend to press against the pressing member 9.

[0026] A rotating shaft 20 is fixedly connected within the slide groove 11. The rotating shaft 20 movably passes through the end of the fixed plate 12, allowing the fixed plate 12 to rotate and slide within the slide groove 11. The rotating shaft 20 serves as the fulcrum and sliding guide shaft for the fixed plate 12 within the slide groove 11. It allows the fixed plate 12 to both rotate around it (to adapt to different locking positions) and slide along its axial direction (to achieve clamping and loosening).

[0027] It is worth noting that the width of the sliding groove 11 and the mating groove 18 is greater than the width of the vertical plate 1201, and the width of the sliding groove 11 and the mating groove 18 is slightly greater than the thickness of the vertical plate 1201 of the fixed plate 12, which provides the necessary space gap for the slight swing and position self-adaptation of the fixed plate 12.

[0028] The rotating plate 8 has an overlap groove 21 at its end, which is pressed against the pressing member 9. The contact surface between the overlap groove 21 and the pressing member 9 is treated with anti-slip treatment. The overlap groove 21 is a specially shaped notch used to wrap or hold the pressing member 9 (which may be a cylindrical rod). The anti-slip treatment (such as knurling, coating, rubber pad) increases the friction coefficient of the contact surface.

[0029] The vertical plate 1201 of the fixed plate 12 has a pressing groove 22 on its side. The end of the pressing groove 22 near the rotating plate 8 is inclined. Multiple pressing columns 23 are fixedly connected in the mating groove 18. The pressing columns 23 are pressed against the side of the vertical plate 1201 of the fixed plate 12.

[0030] It is worth noting that, in order to ensure stability after the angle is adjusted, radial pins can be added to the threaded rod 4 for locking. That is, multiple locking screw holes are opened on the threaded rod 4, so that two radial pins are inserted into the locking screw holes and the two radial pins are pressed against the two ends of the movable block 6. This method is a conventional technology and will not be described in detail. It serves as another guarantee for stability.

[0031] The vertical rotating plate 8 and the pressing part 9 can also be welded and fixed together. When adjustment is needed again, the weld can be removed.

[0032] It is worth noting that, given the current reliance on imports for large-diameter stern tube white alloy bearings, this application develops large-diameter stern tube white alloy bearings, employing three process schemes during the development process: Traditional centrifugal casting, spray welding, and welding techniques: Traditional centrifugal casting requires cleaning and tin-enameling, mainly due to environmental concerns. Acid washing emissions pollute the environment and do not meet the assessment and protection requirements. Moreover, casting blanks weighing over 2000 kg carries a high risk factor, so casting large-diameter bearings is not recommended.

[0033] Spray welding technology: Molten alloy is sprayed out from the nozzle by an electromagnetic pump, and high-pressure, high-temperature compressed air is blown into the nozzle by an air knife to spray the alloy onto the workpiece wall. However, temperature control is complicated and the operation cannot be interrupted.

[0034] Welding technology: White alloy welding is performed using a dual-frequency welding machine, where the pre-pressed alloy welding wire is welded to the pipe wall. This results in a strong structure, high density, and an increase in the specific compressive strength of the weld metal of over 10%. All current adjustments are controlled by a programmable logic controller (PLC), ensuring stability and reliability.

[0035] The welding process steps for the stern tube white alloy bearing are as follows: S1. Casting blanks, ship inspection certification (HT250, QT500). S2. Roughly machine the inner hole to the required welding dimensions; S3. Cleaning and polishing the inner hole; S4. Heat the outer casing to 200℃~180℃; S5. Welding Babbitt metal (adjust welding current and speed according to process requirements); S6. Rough machining to process dimensions; S7. Finishing (processing according to the approved product drawings); S8. Clean the packaging.

[0036] Working principle: When the bearing in some equipment does not require the bearing to change its overall angle (has a certain range of movement), it is not necessary to connect the connecting sleeve 13 to the fixed column 2 (other components such as the threaded rod 4, the pressing part 9, and the limiting plate 5 on the connecting sleeve 13 will not be installed on the fixed column 2), and it is not necessary to install the connecting plate 3 to the fixed column 2 (the connecting plate 3 is not used), and the fixed column 2 is connected and fixed to the structure or the fixed seat of other machines (mounting hole 14 and screw installation method), thereby fixing the outer ring 1 of the bearing to the structure or the fixed seat.

[0037] When the bearings in other equipment need to rotate and adjust the overall bearing angle: first, put the connecting sleeve 13 onto the fixed column 2, and then install the two connecting plates 3 onto the end of the fixed column 2. At this time, the mounting holes 14 on the fixed column 2 are not fixed with screws, and the connecting plates 3 are fixedly installed on the structure or fixed seat by screws, thereby completing the installation of the bearing with the structure or its fixed seat. It is worth noting that the pressing member 9 is located between the two inclined plates 15. Note the different directions of the required tilt angle. Since the extension length of one end of the pressing member 9 relative to the movable block 6 is greater than that of the other end, the movable block 6 can be moved and disengaged from the limiting plate 5 (at this time, the locking plate 7 also disengages from the limiting plate 5). Then, the movable block 6 rotates 180 degrees at the end of the limiting plate 5, thereby changing the position of the pressing member 9 (the pressing member 9 rotates 180 degrees synchronously). Finally, the adjusted movable block 6 slides back towards the limiting plate 5, and the other locking plate 7 is movably engaged with the limiting plate 5. This process adjusts the position of the pressing member 9, which facilitates the subsequent adjustment of the tilt angle.

[0038] First, the self-rotating threaded rod 4, due to the sliding of the movable block 6 on the limiting plate 5, and the further limiting sliding of the clamping plate 7 and the limiting plate 5, causes the movable block 6 to drive the pressing part 9 to move. The pressing part 9 presses against the inclined pressure plate 15, while the position of the inclined pressure plate 15 remains unchanged, and the inclined pressure plate 15 reacts to the pressing part 9. At the same time, by moving the movable block 6 and the movable pressing part 9, the fixed column 2 and the outer ring 1 are adjusted to a suitable angle, and the rotation of the threaded rod 4 is stopped (the self-locking function of the threaded rod 4 means that it will not rotate after the active rotation is stopped). Then, rotate the horizontal rotating plate 8 to make it vertical. The movable groove 10 of the rotating plate 8 will switch to a vertical state simultaneously. Under the action of the compression spring 19, the position of the rotating shaft 20 will move closer to the connecting plate 17. The side of the rotating plate 8 will be attached to the connecting plate 17, while the overlapping groove 21 will press against the pressing member 9 (on the four columnar structures of the pressing member 9). The rotating plate 8 will fix the pressing member 9 and the movable block 6 to each other. At this time, under the action of the compression spring 19, the vertical plate 1201 moves closer to the outer ring 1 along the mating groove 18. On the one hand, the pressing groove 22 moves closer to the outer ring 1 simultaneously. Under the action of the fixed pressing column 23, the pressing groove 22 is disengaged from the mating groove 18 and the pressing column 23. The side of the vertical plate 1201 (the position other than the pressing groove 22) contacts the fixed pressing column 23, thereby causing the vertical plate 1201 to move towards the movable block 6 at the same time, so that the inclined plate 1202 moves closer to the threaded rod 4, thereby causing the inclined plate 1202 to press against the threaded rod 4, further fixing and restricting the threaded rod 4. With the self-locking of the threaded rod 4, the stabilizing effect is strengthened. On the other hand, the bonding plate 1203 is slightly bonded to the movable block 6, and the other side is tightly pressed against the pressing member 9 (on the four columnar structures of the pressing member 9), further strengthening the stable connection between the movable block 6 and the pressing member 9.

Claims

1. A white alloy bearing for a ship's stern tube, comprising: The outer ring (1), the inner ring, and the rolling element located between the outer ring (1) and the inner ring are characterized in that: a fixed column (2) is fixedly connected to the outer ring (1), a connecting plate (3) is provided at the end of the fixed column (2), a threaded rod (4) is rotatably connected to the fixed column (2), a limiting plate (5) is provided on the fixed column (2), a movable block (6) that is threadedly connected to the threaded rod (4) is slidably fitted on the limiting plate (5), a clamping plate (7) is fixedly connected to the movable block (6), the clamping plate (7) is slidably fitted with the limiting plate (5), and the movable plate is flipped and adjusted by moving the movable block (6) away from the limiting plate (5); It also includes a rotating plate (8) and a pressing member (9) that presses against the connecting plate (3). The pressing member (9) has a movable groove (10) in the middle, and the movable block (6) moves in the movable groove (10). The end of the rotating plate (8) is rotatably connected to a sliding groove (11). A fixed plate (12) that slidably engages with the threaded rod (4) is in the sliding groove (11). The rotating plate (8) and the pressing member (9) press against each other. By rotating the pressing member (9) and cooperating with the rotating mechanism, the fixed plate (12) restricts the threaded rod (4) while the rotating plate (8) presses against the fixed pressing member (9).

2. The white alloy bearing for a ship's stern tube according to claim 1, characterized in that: A connecting sleeve (13) is fitted onto the fixed column (2) located at the top. The threaded rod (4) is rotatably connected to the connecting sleeve (13). The limiting plate (5) is connected and fixed to the connecting sleeve (13). An installation hole (14) is provided on the fixed column (2).

3. A white alloy bearing for a ship's stern tube according to claim 1, characterized in that: The connecting plate (3) located at the top position has two inclined pressure plates (15) fixedly connected to its side. The two inclined pressure plates (15) are in abutting fit with the two ends of the pressing member (9).

4. A white alloy bearing for a ship's stern tube according to claim 3, characterized in that: The movable block (6) is provided with a sliding groove (16) that slides with the pressing member (9), and the edge of the pressing member (9) that contacts the inclined pressure plate (15) has an arc-shaped structure.

5. A white alloy bearing for a ship's stern tube according to claim 1, characterized in that: The fixing plate (12) is composed of a vertical plate (1201) and an inclined plate (1202) connected and fixed. The vertical plate (1201) is fixedly connected with a bonding plate (1203) that is in contact with the pressing member (9).

6. A white alloy bearing for a ship's stern tube according to claim 5, characterized in that: The rotating mechanism includes a connecting plate (17) that is fixed to the card plate (7). A mating groove (18) is provided on the connecting plate (17). The fixed plate (12) moves in the mating groove (18). The end of the rotating plate (8) is pressed against the connecting plate (17). A compression spring (19) is connected between the fixed plate (12) and the connecting plate (17).

7. A white alloy bearing for a ship's stern tube according to claim 6, characterized in that: A rotating shaft (20) is fixedly connected inside the groove (11), and the rotating shaft (20) moves through the end of the fixed plate (12).

8. A white alloy bearing for a ship's stern tube according to claim 6, characterized in that: The width of the groove (11) and the mating groove (18) is greater than the width of the vertical plate (1201).

9. A white alloy bearing for a ship's stern tube according to claim 6, characterized in that: The rotating plate (8) has an overlap groove (21) at its end. The overlap groove (21) and the pressing member (9) are pressed together. The contact surface between the overlap groove (21) and the pressing member (9) is treated with anti-slip treatment.

10. A white alloy bearing for a ship's stern tube according to claim 6, characterized in that: The fixed plate (12) is provided with a pressing groove (22). The end of the pressing groove (22) near the rotating plate (8) is inclined. Multiple pressing columns (23) are fixedly connected in the mating groove (18). The pressing columns (23) are pressed against the fixed plate (12).

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