Fin and fin shaft connecting structure for stabilization device

Abstract

The utility model belongs to the technical field of stabilization devices, and particularly relates to a fin and fin shaft connecting structure for a stabilization device, the stabilization device comprises a fin and a fin shaft, the fin comprises an outer shell and a framework located in the shell, the two ends of the shell are a fin root part and a fin tip part respectively, and the framework comprises multiple layers of partition plates which are arranged in a criss-cross mode; a fin shaft mounting position is arranged in the framework, one end of the fin shaft extends into the fin shaft mounting position, and the outer surface of the fin shaft is welded with the joint of the partition plate of the framework; a main partition plate is arranged at the bottom of the fin shaft mounting position; and the end part of the fin shaft is welded with the main partition plate. The problems that in the prior art, a taper interference fit connection mode is high in machining precision requirement, complex in assembly and high in cost are solved, machining and assembly are simplified, the precision machining requirement is lowered, connection stability is enhanced, assembly errors are reduced, and the anti-seismic property and durability in the high-stress environment are improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of anti-roll devices, and in particular relates to a fin and fin shaft connection structure used in anti-roll devices. Background Art

[0002] In ship stabilization systems, anti-roll devices are widely used to reduce the vessel's swaying under the action of transverse waves, improving navigation stability and comfort. Existing anti-roll devices primarily achieve power transmission and motion control through the connection between fins and fin shafts. However, this traditional fin-to-fin shaft connection has many limitations.

[0003] The fin stabilizer is usually composed of an external shell and an internal frame. The frame structure adopts a grid design consisting of longitudinal partitions and transverse partitions staggered to provide high strength and rigid support (see the attached manual). Figure 1-3 (As shown). The spindle sleeve 2 is fixedly connected to the internal framework of the fin 1 by welding or bolts, ensuring the stability and reliability of the overall structure. The fin shaft 3 transmits power through the spindle sleeve 2 and is connected using a tapered interference fit. The inner end of the spindle sleeve 2 precisely fits the tapered portion of the fin shaft 3. A keyway and connecting key 4 further ensure stability and efficiency during power transmission. To ensure precise linkage between the fin shaft 3 and actuator A, the fin shaft and actuator are mechanically coupled. The actuator directly drives the fin shaft and fin 1 to rotate as a whole, thereby achieving efficient anti-roll function.

[0004] The tapered interference fit design between the main shaft sleeve and the fin shaft combined with keyway fixation can provide more reliable coupling in complex sea conditions and reduce the possibility of loosening and offset. However, this tapered surface fitting connection method requires extremely high processing accuracy and requires the use of precision mechanical equipment for taper processing. Any slight processing error may affect the assembly quality and the reliable operation of the system. In addition, in the actual assembly process, the tapered connection surface often needs to be adjusted and positioned multiple times to ensure the appropriate tightness, which not only consumes a lot of time and human resources, but also increases the overall manufacturing and maintenance costs. The high-precision requirements of the tapered connection and the manual adjustment steps reduce production efficiency, increase the economic burden on ship equipment, and limit the widespread application and optimization of the device.

[0005] Therefore, there is an urgent need to improve the connection between the fin and the fin shaft in order to simplify the manufacturing and assembly process, reduce costs, and improve the reliability and maintenance efficiency of the device. Such improvements will help improve the overall performance of the anti-roll device and promote its wider application in the marine industry. Utility Model Content

[0006] The utility model aims to solve the technical problems of the prior art, such as the high processing precision requirement, complex assembly and high cost of the tapered interference fit connection method, and proposes a fin and fin shaft connection structure for a roll stabilizer.

[0007] To achieve the above-mentioned purpose, the present invention provides a fin and fin shaft connection structure for a roll reduction device, wherein the roll reduction device includes a fin and a fin shaft, the fin includes an external shell and a skeleton located inside the shell, the two ends of the shell are respectively a fin root and a fin tip, the skeleton includes multiple layers of partitions arranged in a criss-cross pattern, and is characterized in that a fin shaft mounting position is provided in the skeleton, one end of the fin shaft extends into the fin shaft mounting position, and its outer surface is welded to the joint of the partition of the skeleton; a main partition is provided at the bottom of the fin shaft mounting position, and the end of the fin shaft is welded to the main partition.

[0008] In a preferred implementation, further, a groove welding structure is adopted at the junction of the skeleton and the fin shaft.

[0009] In a preferred implementation, further, the welding structure of the groove adopts a "V" shape.

[0010] In a preferred implementation, further, both sides of the groove are opened at an angle of 35° to 55° respectively.

[0011] In a preferred implementation, further, the width of the groove ranges from 10 mm to 15 mm; a gap is provided between the root of the groove and the fin axis, and the gap ranges from 1.5 mm to 2.5 mm.

[0012] In a preferred implementation, further, the central axis of the fin shaft mounting position is perpendicular to the edges of the fin root and the fin tip.

[0013] In a preferred implementation, further, the central axis of the fin shaft is orthogonal to the transverse partition plane of the skeleton.

[0014] The beneficial effects of the utility model are:

[0015] First, the fin-to-fin-shaft connection structure in the anti-roll device of the present invention provides higher strength and rigidity through a grid-like internal skeleton composed of multiple layers of crisscrossing partitions. The fin shaft is a straight cylindrical structure and is directly inserted into the reserved fin shaft installation position. The junction of the outer surface and multiple partitions is firmly connected by welding. The setting of the main partition enables the fin shaft to stably abut against the main partition when inserted into the fin shaft installation position, thereby enhancing the positioning accuracy and connection stability of the fin shaft and effectively distributing the load. This welding design of the fin shaft and the grid-like skeleton simplifies the processing and assembly process, reduces the requirements for precision processing of the connection parts, and improves the stability and reliability of the overall connection. Compared with the complex tapered interference fit and keyway design between the main shaft sleeve and the fin shaft in the prior art, the present invention reduces the possibility of assembly errors, reduces manufacturing costs, and improves the mechanical properties and seismic resistance of the device in high-stress environments, ensuring that the anti-roll device is more efficient and durable.

[0016] Second, in a preferred implementation, the design of the central axis of the fin shaft of the present invention being orthogonal to the partition plane of the internal skeleton can ensure that the fin shaft and the internal skeleton are accurately positioned at an angle during assembly.

[0017] Third, in the preferred implementation, the present invention adopts a "V"-shaped groove welding structure. The opening design with an angle range of 35° to 55° helps to form a stable molten pool, ensures that the weld is fully penetrated and obtains a high-strength joint. The groove width range of 10mm to 15mm provides sufficient operating space, and the root gap design of 1.5mm to 2.5mm effectively prevents stress concentration, improves the mechanical properties and reliability of the weld joint, and thus enhances the overall stability and durability of the anti-roll device. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the connection structure between the fin and the fin shaft of the existing anti-roll device Figure 1 ;

[0019] Figure 2 This is a schematic diagram of the overall structure of the fin, fin shaft and actuator of the existing anti-roll device;

[0020] Figure 3 This is a schematic diagram of the connection structure between the fin and the fin shaft of the existing anti-roll device Figure 2 ;

[0021] Figure 4 This is a schematic diagram of the connection structure between the fin and the fin shaft of the anti-roll device of the embodiment of the utility model Figure 1 ;

[0022] Figure 5 This is a schematic diagram of the connection structure between the fin and the fin shaft of the anti-roll device of the embodiment of the utility model Figure 2 ;

[0023] Figure 6 It is a schematic diagram of welding the fin shaft and the frame in an embodiment of the present utility model.

[0024] Among them, 1-fin; 10-fin root; 11-fin tip; 12-skeleton; 13-main partition; 2-sleeve; 3-tapered fin shaft; 4-connecting key; 5-fin shaft; 6-welding groove; A-actuator. DETAILED DESCRIPTION

[0025] In order to enable those skilled in the art to better understand the technical solution of the present application, the present application will be further described in detail below with reference to the accompanying drawings and embodiments.

[0026] The terms "up", "down", "left", "right", "front", and "back" in this application are based on the positional relationships shown in the accompanying drawings. The corresponding positional relationships may vary depending on the drawings, and should not be construed as limiting the scope of protection.

[0027] In this application, the terms "installed," "connected," "connected," "connected," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, integral connection, mechanical connection, electrical connection, or mutual communication. They can also be directly connected or indirectly connected through an intermediate medium. They can also refer to internal communication between two components or interaction between two components. For those skilled in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0028] Example

[0029] As the instruction manual Figure 4-5 The fin 1 of the anti-roll device consists of an outer shell and a framework 12 located within the shell. The outer shell is streamlined to reduce water resistance and enhance the device's anti-roll effect. The shell is terminated at either end by a fin root 10 and a fin tip 11. The fin root 10 connects to the fin shaft, while the fin tip 11 tapers to its outermost end to optimize hydrodynamic performance.

[0030] The internal skeleton 12 is constructed from multiple layers of crisscrossing baffles, interconnected to form a high-strength frame structure, providing support and maintaining the fin's shape and rigidity. The skeleton 12 houses the fin shaft mounting area, with a main baffle 13 positioned at its base. The axis of the fin shaft mounting area is perpendicular to the edges of the fin root 10 and fin tip 11, ensuring precise alignment of the fin shaft 5 during insertion. The depth of the mounting area extends from the fin root 10 toward the fin tip 11 to provide sufficient insertion space and connection strength.

[0031] In this embodiment, the fin shaft is a fin shaft 5. One end of the fin shaft 5 is inserted into the fin shaft mounting position to ensure the fin shaft's installation stability and mechanical performance. After the fin shaft 5 is inserted into the fin shaft mounting position, its end is welded to the main partition 13. Its outer surface is welded to the contact surfaces of multiple partitions. These welds include multiple spot welds where multiple partitions surround the outer surface of the fin shaft, as well as welds between the fin shaft 5 and the main partition 13.

[0032] Specifically, the welds at the intersection of the fin shaft 5 and the frame 12 are evenly distributed to disperse stress and increase the overall structure's fatigue resistance. At the deepest point of the fin shaft installation, the fin shaft 5 is circumferentially welded to a thicker main partition 13, ensuring a strong mechanical connection at the location of maximum stress.

[0033] In this embodiment, the fin shaft 5 is welded by flux-cored gas shielded welding, and the welding joint is branch pipe welding. Flux-cored welding wire can provide stable welding quality, reduce welding spatter, and improve work efficiency and welding strength.

[0034] Specifically, the external structure of the anti-roll device and the bulkheads that form its internal framework are constructed from high-strength sheet materials, such as AH32, DH32, EH32, FH32, AH36, DH36, EH36, or FH36. These marine steels offer excellent corrosion resistance and are particularly well-suited for use in marine environments, preventing seawater corrosion and thus extending the device's service life. The fin shaft 5, a key load-bearing component of the entire anti-roll device, is typically constructed from round steel (such as 35CrMo or 30CrMo). These materials offer excellent mechanical properties, particularly high strength and excellent torsional and bending resistance, enabling them to withstand the dramatic load fluctuations and impact forces generated during operation.

[0035] HYE711 flux-cored wire is used as the welding material to ensure high strength and durability of the weld joint. The welding current is controlled between 250A and 350A, with a preferred range of 280A to 300A, to minimize weld distortion while ensuring full penetration. The arc voltage is set between 30V and 40V, with a preferred range of 35V to 38V, to ensure arc stability and minimize welding defects. The current and voltage should be strictly controlled during welding to avoid defects such as porosity and cracks in the weld joint.

[0036] The angle and size of the weld groove are optimized based on the weld thickness and material properties to ensure sufficient weld penetration and a high-quality joint. The groove can be either an "X" or "V" type, depending on the thickness and stress distribution of the parent material.

[0037] As the instruction manual Figure 6 , Figure 6A schematic diagram of the welding structure of the fin shaft 5 and the skeleton 12 is shown. In this embodiment, the central axis of the fin shaft 5 is perpendicular to the horizontal plate of the internal skeleton, and the axis of the fin shaft is orthogonal to the plane of the internal skeleton. This design can ensure that the fin shaft and the skeleton are precisely aligned during installation, which contributes to the stability and anti-roll effect of the entire anti-roll device. The connection position of the fin shaft 5 and the internal skeleton adopts a "V"-shaped groove welding structure to ensure that the fin shaft can be firmly and accurately connected to the internal skeleton. Specifically, the two sides of the welding groove are opened at an angle of 35° to 55°, forming a total angle of 70° to 110°, preferably an opening of 45°, forming a total angle of 90°. This uniform groove angle contributes to the formation of the molten pool and ensures sufficient penetration of the weld to achieve a high-strength welded joint. The width of the welding groove ranges from 10mm to 15mm, preferably 12mm. This size provides sufficient operating space to ensure a stable welding arc, thereby reducing the occurrence of welding defects. The depth of the welding area from the top of the weld to the bottom of the weld ranges from 80mm to 120mm, preferably 100mm. This depth design can ensure that the filler material is fully melted and fills the entire groove during the welding process to form a high-strength joint. The root width gap where the cross plate of the skeleton 12 meets the fin shaft 5 is set in the range of 1.5mm to 2.5mm, preferably 2mm. This gap helps prevent stress concentration during welding, reduces the risk of welding cracks, and provides sufficient space for filling materials to improve the overall mechanical properties of the welded joint. Through the above-mentioned groove design, the weld can obtain sufficient penetration to form a high-strength joint, especially when used in high stress or complex mechanical environments, providing good mechanical properties.

[0038] The installation process of the fin shaft 5 and the fin 1 in this embodiment is as follows:

[0039] First, perform surface treatment on the contact area between the fin shaft and the frame, such as polishing and cleaning, to remove oil and oxide layers. Then, insert the fin shaft 5 into the fin shaft mounting position of the internal fin frame. Use a special clamp to secure the fin shaft to the internal frame, ensuring that the central axis of the fin shaft is perpendicular to the edges of the fin root 10 and the fin tip 11. Then, use flux-cored gas shielded welding, using HYE711 welding material. The welding current should be controlled between 250A and 350A, and the arc voltage should be between 30V and 40V. During the welding process, follow the principle of welding the inner ring first and then the outer ring to prevent welding deformation. After each weld is completed, clean the slag promptly to ensure the quality of the next weld. When welding is completed, check the weld direction to ensure that the weld is perpendicular to the centerline of the fin shaft. After welding is completed, perform non-destructive testing, such as ultrasonic testing or X-ray testing, to ensure that the weld is free of defects such as cracks and pores. If welding defects are found, they should be repaired and retested in a timely manner until the quality requirements are met.

[0040] The fin-to-fin shaft connection structure in this new anti-roll device utilizes multiple layers of crisscrossing partitions to form a grid-like framework, enhancing overall strength and rigidity. The fin shaft is directly inserted into a pre-set mounting position and connected by welding, simplifying machining and assembly, reducing precision machining requirements, and enhancing connection stability and reliability. Compared to existing tapered interference fit and keyway designs, this new design reduces assembly errors, lowers costs, and improves seismic resistance and durability in high-stress environments.

[0041] The above is only an embodiment of the present invention, and common knowledge such as the specific structure and characteristics of the scheme are not described in detail here. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is limited by the appended claims rather than the above description, and it is intended that all changes that fall within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any figure mark in the claims should not be regarded as limiting the claim involved.

Claims

1. A fin and fin shaft connection structure for a roll stabilizer, the roll stabilizer comprising a fin (1) and a fin shaft, the fin (1) comprising an external shell and a frame (12) located within the shell, the two ends of the shell being respectively a fin root and a fin tip, the frame (12) comprising multiple layers of crisscrossing partitions, characterized in that: A fin shaft mounting position is provided in the frame (12), one end of the fin shaft (5) extends into the fin shaft mounting position, and its outer surface is welded to the joint of the partition of the frame (12); a main partition (13) is provided at the bottom of the fin shaft mounting position, and the end of the fin shaft (5) is welded to the main partition (13).

2. The fin and fin shaft connection structure for a roll stabilizer according to claim 1, characterized in that: The joint between the skeleton (12) and the fin shaft (5) adopts a groove welding structure.

3. The fin and fin shaft connection structure for a roll stabilizer according to claim 2, characterized in that: The welding structure of the groove adopts a "V" shape.

4. The fin-to-fin-shaft connection structure for a roll stabilizer according to claim 3, characterized in that: Both sides of the groove are opened at an angle of 35° to 55° respectively.

5. The fin and fin shaft connection structure for a roll stabilizer according to claim 4, characterized in that: The width of the groove is in the range of 10 mm to 15 mm; a gap is provided between the root of the groove and the fin axis (5), and the gap range is in the range of 1.5 mm to 2.5 mm.

6. The fin-to-fin-shaft connection structure for a roll stabilizer according to claim 1, characterized in that: The central axis of the fin shaft installation position is perpendicular to the edges of the fin root and the fin tip.

7. The fin-to-fin-shaft connection structure for a roll stabilizer according to claim 1, characterized in that: The central axis of the fin shaft (5) is orthogonal to the transverse partition plane of the skeleton (12).

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