A torsion-resistant truss strut structure for a longline fishing vessel

Abstract

The application discloses a torsion-resistant truss type supporting rod structure of an ocean fishing boat, which comprises an outer truss, the outer truss comprises a plurality of positioning frames distributed at equal intervals, a plurality of main chord rods arranged at the vertexes of the positioning frames, a plurality of transverse web rods arranged in the positioning frames and oblique web rods, an inner rotating shaft is slidingly and rotatably connected in the outer truss, a hanging seat is arranged at the front end of the inner rotating shaft, positioning plates are arranged at the front and rear ends of the outer wall of the inner rotating shaft, a buffer assembly is arranged at the front and rear ends of each positioning plate in the outer truss, a cross beam and a tension assembly are sequentially and rotatably arranged at the rear end of the inner rotating shaft, a root mounting seat is arranged at the rear end of the outer wall of the outer transverse frame, and a plurality of stress diffusion plates are arranged on the outer wall of the root mounting seat. The outer truss bears external impact and torsion through a space triangle truss, and the inner rotating shaft bears the fishing net tension independently, so that the bearing functions are separated, and the safety hidden danger of the ship is reduced.

Description

Technical Field

[0001] This invention relates to the field of marine fishing equipment technology, and in particular to an anti-torsion truss strut structure for ocean-going fishing vessels. Background Technology

[0002] Deep-sea fishing vessels, especially trawlers and tuna longline fishing vessels, typically have large openings at the stern or midships for convenient fishing operations, and are equipped with long cantilever struts (such as netting struts, outboard struts, etc.) extending aft or outboard. These struts bear enormous bending, shearing, and torque when the ship rolls, pitches, or is unbalanced with cargo. Traditional solid round tube or box girder struts often have large wall thicknesses to meet strength requirements, resulting in a significant increase in self-weight. This not only raises the ship's center of gravity but also affects stability. At the same time, the deck structure at the large opening is prone to stress concentration under torsional loads, which can lead to fatigue cracks over long-term operation, threatening the safety of the ship. Summary of the Invention

[0003] The purpose of this invention is to provide a torque-resistant truss strut structure for ocean-going fishing vessels. This structure uses a spatial triangular truss to withstand external impacts and torques, and independent built-in swivel bearings to withstand the tension of fishing nets, thereby achieving separation of load-bearing functions and reducing safety hazards to the vessel.

[0004] The above-mentioned technical objective of the present invention is achieved through the following technical solution: A torque-resistant truss strut structure for a deep-sea fishing vessel includes an outer truss. The outer truss includes several positioning frames distributed at equal intervals, multiple main chord members set at the apex of the positioning frames, and several horizontal and diagonal web members set within the positioning frames and used to connect the main chord members. The outer truss is provided with multiple fixed rings distributed at equal intervals and fixedly connected to the corresponding positioning frames. The inner wall of each fixed ring is slidably and rotatably connected to an inner rotating shaft extending from the front end of the outer truss. The inner rotating shaft is located at the axial center of the outer truss. The inner rotating shaft is provided with a mounting seat at its front end. Positioning plates are provided at both the front and rear ends of the outer wall of the inner rotating shaft. Buffer components are provided at both the front and rear ends of each positioning plate inside the outer truss. A cross joint is installed at the rear end of the inner rotating shaft. A tension component is provided at the rear end of the cross joint. A root mounting seat is provided at the rear end of the outer wall of the outer cross frame. Multiple radial stress diffusion plates are provided on the outer wall of the root mounting seat.

[0005] By adopting the above technical solution, when in use, the device is first installed on the fishing boat, and the stress diffusion plate is lap-welded to the web and panel of the longitudinal girder and the strong crossbeam of the fishing boat deck. When in use, the fishing net's support rope is passed through the hook seat, and the free end of the pull rope is connected to the swivel on the fishing boat. During the retrieval of the fishing net, the outer truss is subjected to the impact of the waves, while the inner swivel bearing is subjected to the drag force of the fishing net. Since the inner swivel bearing can slide and rotate within the outer truss, it can adaptively adjust the fishing net's tension according to the fluctuations of the waves, avoiding stress concentration that would cause the force of the inner swivel bearing to act directly on the outer truss, thereby achieving the separation of the load-bearing functions. During the entire trawl retrieval process, even if the outer truss undergoes slight deformation under stress, it will not affect the normal connection and operation between the inner swivel bearing and the tension component under the action of the swivel bearing. At the same time, the tension component can act as an elastic buffer element.

[0006] A further configuration of the present invention is as follows: the mounting base includes a U-shaped connecting block, a U-shaped connecting rod rotatably connected between the left and right sides of the inner wall of the connecting block, and a roller sleeve fitted over the outer wall of the horizontal section of the connecting rod.

[0007] By adopting the above technical solution, the inner rotating shaft can not only provide a dragging fulcrum for the fishing net, but also adapt to the slight bending deformation of the outer truss when it is impacted by sea waves, ensuring that the inner rotating shaft is always in a pure axial tension state and is not subject to additional bending moment and torque.

[0008] A further feature of the present invention is that a pulley is rotatably connected to the front of the upper end of the outer wall of the outer truss, and a rope for connecting to the fishing boat is sleeved on the outer wall of the pulley.

[0009] By adopting the above technical solution, an upward pulling force can be provided to the outer truss when the fishing net is dragged, reducing the force on the root mounting base and thus reducing the metal fatigue of the outer truss.

[0010] A further provision of the present invention is that: the front end of the outer wall of the outer truss is provided with a support seat that is sleeved on the outer wall of the inner rotating shaft, the support seat includes a support ring, a shrink sleeve disposed at and communicating with the front end of the outer wall of the support ring, a plurality of balls rotatably connected to the inner wall of the support ring, and a plurality of support columns that are equally spaced and inclined on the outer wall of the support ring.

[0011] By adopting the above technical solution, not only can the inner rotating shaft extending from the front end of the outer truss be supported, but it can also avoid bending due to local stress and prevent the axial expansion and contraction of the inner rotating shaft.

[0012] A further embodiment of the present invention is that the buffer assembly includes a fixed plate, a plurality of damping rods installed on the outer wall of the fixed plate and distributed at equal intervals around the circumference, a damping spring disposed on the upper end of each damping rod, and a buffer ring pad disposed on the upper end of the damping spring.

[0013] By adopting the above technical solution, when the inner rotating shaft undergoes axial displacement, not only can the stroke of the inner rotating shaft be limited, but direct rigid impact on the interior of the outer truss can also be avoided, allowing it to freely return to its initial position.

[0014] A further configuration of the present invention is as follows: the tension assembly includes a cylinder, a plurality of guide grooves formed on the inner wall of the cylinder, a piston slidably connected to the cylinder and cooperating with the guide grooves, a return spring cooperating with the bottom of the inner wall of the cylinder and the lower end of the piston, and a push rod disposed at the rear end of the piston and extending out of the cylinder.

[0015] By adopting the above technical solution, the inner rotating shaft can be elastically buffered according to the tension of the fishing net without affecting the normal operation of the outer truss, and the rigid impact can be transformed into a mild flexible load.

[0016] A further configuration of the present invention is as follows: the outer truss is arranged in a triangular shape, and the two adjacent positioning frames on the left and right sides of the outer wall of the outer truss are connected by diagonal braces. The diagonal braces are arranged diagonally with the two adjacent positioning frames, and the diagonal braces on the left and right sides of the outer wall of the outer truss face opposite directions.

[0017] A further feature of the present invention is that both the front and rear ends of the outer wall of the outer truss are covered with a skin made of fiberglass or aluminum alloy, and the skin is bonded to the main chord and the tie rod by sealant and fixed with screws or rivets, thereby forming a closed hybrid structure.

[0018] By adopting the above technical solution, not only can the torsional stiffness be further improved, but also the corrosion of working parts caused by seawater entering the outer truss can be prevented.

[0019] In summary, the present invention has the following beneficial effects: Firstly, this invention uses a spatial triangular truss to withstand external impacts and torques, and an independent built-in swivel bearing to withstand the tension of the fishing net, thus achieving separation of load-bearing functions and reducing safety hazards to ships. Secondly, the present invention, through the cooperation of the buffer component and the tension component, can achieve adaptive adjustment according to the tension and the size of the waves when dragging the fishing net, transforming the rigid impact on the inner shaft into a mild flexible load, and preventing the inner shaft from breaking due to overload. Thirdly, by installing tie rods and covering the outer wall of the outer truss, this invention can not only improve the torsional stiffness of the outer truss, but also prevent seawater from entering the outer truss and causing corrosion to the main working components, thereby affecting its service life. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 It is mainly used to show the positional connection relationship of each component; Figure 3 This is a schematic diagram of the support base of the present invention; Figure 4 This is a schematic diagram of the structure of the buffer component of the present invention; Figure 5 This is a schematic diagram of the tensile component of the present invention.

[0021] In the diagram: 1. Outer truss; 11. Positioning frame; 12. Main chord; 13. Horizontal web member; 14. Diagonal web member; 15. Diagonal tie rod; 16. Skin; 2. Fixing ring; 21. Inner pivot; 22. Hanging seat; 23. Connecting block; 24. Connecting rod; 25. Roller sleeve; 3. Pulley; 31. Pull rope; 32. Support seat; 33. Support ring; 34. Shrink sleeve; 35. Ball bearing; 36. Support column; 4. Positioning plate; 41. Buffer assembly; 42. Fixing plate; 43. Damping rod; 44. Damping spring; 45. Buffer ring pad; 5. Cross joint; 51. Tension assembly; 52. Cylinder; 53. Guide groove; 54. Piston; 55. Return spring; 56. Push rod; 6. Root mounting seat; 61. Stress diffusion plate. Detailed Implementation

[0022] The present invention will be further described in detail below with reference to the accompanying drawings.

[0023] In the description of this invention, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this 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, they should not be construed as limitations on this invention.

[0024] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0025] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, a direct connection, or an indirect connection through an intermediate medium; or they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0026] Example, refer to Figure 1-5 A torque-resistant truss strut structure for a deep-sea fishing vessel includes an outer truss 1. The outer truss 1 includes several positioning frames 11 arranged in a triangular pattern with equal spacing, three main chord members 12 located at the vertices of the positioning frames 11, and several horizontal web members 13 and diagonal web members 14 located within the positioning frames 11 and used to connect the main chord members 12. The horizontal web members 13 and diagonal web members 14 cooperate to form a triangle and are integrally set with the corresponding positioning frames 11. Two adjacent positioning frames 11 on the left and right sides of the outer wall of the outer truss 1 are connected by diagonal tie rods 15. The diagonal tie rods 15 are diagonally arranged with the two adjacent positioning frames 11 and form two triangular spaces between the two adjacent positioning frames 11. The diagonal tie rods 15 on the left and right sides of the outer wall of the outer truss 1 face opposite directions and are arranged along the length direction of the left and right sides of the outer wall of the truss and cooperate to form a V-shape.

[0027] Multiple fixed rings 2 are provided inside the outer truss 1, which are evenly distributed and fixedly connected to the corresponding positioning frame 11. The inner wall of the fixed ring 2 is slidably and rotatably connected to an inner rotating shaft 21 that extends out of the front end of the outer truss 1. The inner rotating shaft 21 is located at the axis of the outer truss 1. Both the front and rear ends of the inner wall of the outer truss 1 are provided with connecting seats that cooperate with it and are used to support and fix the inner rotating shaft 21. A pulley 3 is rotatably connected to the front of the upper end of the outer wall of the outer truss 1. The outer wall of the pulley 3 is covered with a pull rope 31 that is connected to the fishing boat. The pull rope 31 can provide an upward pulling force to the outer truss 1, thereby appropriately strengthening the force on the root of the outer truss 1.

[0028] The front end of the inner rotating shaft 21 is provided with a mounting seat 22. The mounting seat 22 includes a U-shaped connecting block 23, a U-shaped connecting rod 24 that is rotatably connected between the left and right sides of the inner wall of the connecting block 23, and a roller sleeve 25 that is sleeved on the outer wall of the horizontal section of the connecting rod 24. When the fishing net is pulled by the connecting rod 24, the connecting rod 24 can be rotated back and forth according to the actual situation to adjust the direction of the force and avoid stress concentration. The front end of the outer wall of the outer truss 1 is provided with a support seat 32 that is sleeved on the front end of the outer wall of the inner rotating shaft 21. The support seat 32 includes a support ring 33, a shrink sleeve 34 that is set at the front end of the outer wall of the support ring 33 and communicates with it, several balls 35 that are rotatably connected to the inner wall of the support ring 33, and multiple support columns 36 that are evenly distributed on the outer wall of the support ring 33 and are inclined. The support seat 32 can provide a certain degree of support for the front end of the inner rotating shaft 21 and can also disperse the force on the front end of the outer wall of the inner rotating shaft 21 to prevent deformation and affect normal operation.

[0029] A positioning plate 4 is provided at both the front and rear ends of the outer wall of the inner rotating shaft 21 and inside the outer truss 1. A buffer assembly 41 is provided at both the front and rear ends of each positioning plate 4 inside the outer truss 1. The buffer assembly 41 includes a fixed plate 42, multiple damping rods 43 installed on the outer wall of the fixed plate 42 and distributed at equal intervals around the circumference, a damping spring 44 respectively provided on the upper end of each damping rod 43, and a buffer ring pad 45 provided on the upper end of the damping spring 44. The cooperation of the buffer ring pad 45 and the damping spring 44 can reduce the rigid impact on the damping rod 43 when the axis of the inner rotating shaft 21 moves.

[0030] A cross-shaped element 5 is installed at the rear end of the inner rotating shaft 21. A tension component 51 is set at the rear end of the cross-shaped element 5. The cross-shaped element 5 ensures that the normal connection between the inner rotating shaft 21 and the tension component 51 will not be affected when the outer truss 1 undergoes slight deformation. At the same time, it will not affect the force exerted by the tension component 51 on the inner rotating shaft 21. The tension component 51 includes a cylinder 52, four guide grooves 53 opened in the inner wall of the cylinder 52, a piston 54 slidably connected in the cylinder 52 and cooperating with the guide grooves 53, a return spring 55 cooperating between the bottom of the inner wall of the cylinder 52 and the lower end of the piston 54, and a push rod 56 set at the rear end of the piston 54 and extending out of the cylinder 52. The return spring 55 is sleeved on the outer wall of the push rod 56. The cylinder 52 is filled with hydraulic oil, and a seal is set at the position where the push rod 56 extends out of the cylinder to prevent hydraulic oil from leaking out.

[0031] A root mounting base 6 is provided at the rear end of the outer wall of the outer cross frame. The outer wall of the root mounting base 6 is provided with multiple radial stress diffusion plates 61. Both the front and rear ends of the outer wall of the outer truss 1 are covered with skins 16 made of fiberglass or aluminum alloy. The skins 16 protect the buffer assembly 41 and the tension assembly 51. The skins 16 are bonded to the main chord 12 and the diagonal tie rod 15 with sealant and fixed with screws or rivets, thereby forming a closed hybrid structure. This enhances the torsional stiffness of the outer truss 1 and prevents seawater from eroding the buffer assembly 41, thus extending its service life.

[0032] Usage: When in use, first install this device on the fishing boat, and weld the stress diffusion plate 61 to the web plate and panel of the longitudinal girder and the strong crossbeam of the fishing boat deck respectively. Then, pass the fishing net support rope through the connecting rod 24 on the hanger 22, and at the same time connect the free end of the pull rope 31 to the reel on the fishing boat. When the fishing operation is carried out and the net is retrieved, the outer truss 1 bears the impact of the waves, while the inner rotating shaft 21 bears the drag force of the fishing net. Since the inner rotating shaft 21 can slide and rotate inside the outer truss 1, it can adaptively adjust the net tension according to the wave fluctuations, avoiding stress concentration that causes the force of the inner rotating shaft 21 to act directly on the outer truss 1, thereby achieving the function of separating the load-bearing functions.

[0033] During the entire trawl retrieval process, even if the outer truss 1 undergoes slight deformation under stress, the normal connection and operation between the inner rotating shaft 21 and the tension assembly 51 will not be affected by the action of the cross-section 5. At the same time, the tension assembly 51 can act as an elastic buffer element, and with the cooperation of the buffer assembly 41, the inner rotating shaft 21 can adjust itself. When the net tension increases instantaneously, the cylinder piston 54 is pulled to release part of the tension. When the tension decreases, the tension assembly 51 is pushed back. This dynamic buffering transforms the rigid impact on the inner rotating shaft 21 into a mild flexible load, preventing the inner rotating shaft 21 from overload and breaking. The damping spring 44 can not only prevent the positioning plate 4 from directly acting on the damping rod 43 when the inner rotating shaft 21 moves axially, but also cooperate with the tension assembly 51 to enable the inner rotating shaft 21 to achieve dynamic buffering.

[0034] This specific embodiment is merely an explanation of the present invention and is not intended to limit the invention. After reading this specification, those skilled in the art can make inventive modifications to this embodiment as needed, but as long as they are within the scope of the claims of the present invention, they are protected by patent law.

Claims

1. A torsion-resistant truss strut structure for a deep-sea fishing vessel, comprising an outer truss (1), characterized in that: The outer truss (1) includes several positioning frames (11) distributed at equal intervals, multiple main chord members (12) set at the apex of the positioning frames (11), and several horizontal web members (13) and diagonal web members (14) set in the positioning frames (11) and used to connect the main chord members (12). The outer truss (1) is provided with multiple fixed rings (2) distributed at equal intervals and fixedly connected to the corresponding positioning frames (11). The inner wall of the fixed ring (2) is slidably and rotatably connected to an inner rotating shaft (21) extending out of the front end of the outer truss (1). The inner rotating shaft (21) is located at the axial center of the outer truss (1). The inner rotating shaft (21) is provided with a hanging seat (22) at its front end. The inner rotating shaft (21) is provided with positioning plates (4) at both the front and rear ends of its outer wall. The outer truss (1) is provided with buffer components (41) at both the front and rear ends of each positioning plate (4). The inner rotating shaft (21) is provided with a cross-shaped component (5) at its rear end. The cross-shaped component (5) is provided with a tension component (51) at its rear end. The outer wall of the outer cross frame is provided with a root mounting seat (6) at its rear end. The outer wall of the root mounting seat (6) is provided with multiple radial stress diffusion plates (61).

2. The anti-torsion truss strut structure for a deep-sea fishing vessel according to claim 1, characterized in that: The mounting bracket (22) includes a U-shaped connecting block (23), a U-shaped connecting rod (24) that is rotatably connected between the left and right sides of the inner wall of the connecting block (23), and a roller sleeve (25) that is sleeved on the outer wall of the horizontal section of the connecting rod (24).

3. The anti-torsion truss strut structure for a deep-sea fishing vessel according to claim 1, characterized in that: The upper end of the outer wall of the outer truss (1) is rotatably connected to a pulley (3), and the outer wall of the pulley (3) is covered with a rope (31) for connecting to the fishing boat.

4. The anti-torsion truss strut structure for a deep-sea fishing vessel according to claim 1, characterized in that: The outer truss (1) has a support seat (32) at the front end of its outer wall that is fitted onto the outer wall of the inner rotating shaft (21). The support seat (32) includes a support ring (33), a shrink sleeve (34) located at the front end of the outer wall of the support ring (33) and communicating with it, a number of balls (35) rotatably connected to the inner wall of the support ring (33), and a number of support columns (36) that are equally spaced and inclined on the outer wall of the support ring (33).

5. The anti-torsion truss strut structure for a deep-sea fishing vessel according to claim 1, characterized in that: The buffer assembly (41) includes a fixed plate (42), a plurality of damping rods (43) installed on the outer wall of the fixed plate (42) and distributed at equal intervals around the circumference, a damping spring (44) respectively disposed on the upper end of each damping rod (43), and a buffer ring pad (45) disposed on the upper end of the damping spring (44).

6. The anti-torsion truss strut structure for a deep-sea fishing vessel according to claim 1, characterized in that: The tension assembly (51) includes a cylinder (52), a plurality of guide grooves (53) formed on the inner wall of the cylinder (52), a piston (54) slidably connected to the cylinder (52) and cooperating with the guide grooves (53), a return spring (55) cooperating with the bottom of the inner wall of the cylinder (52) and the lower end of the piston (54), and a push rod (56) set at the rear end of the piston (54) and extending out of the cylinder (52).

7. The anti-torsion truss strut structure for a deep-sea fishing vessel according to claim 1, characterized in that: The outer truss (1) is arranged in a triangular shape. The two adjacent positioning frames (11) on the left and right sides of the outer wall of the outer truss (1) are connected by diagonal braces (15). The diagonal braces (15) are diagonally arranged with the two adjacent positioning frames (11). The diagonal braces (15) on the left and right sides of the outer wall of the outer truss (1) face opposite directions.

8. The anti-torsion truss strut structure for a deep-sea fishing vessel according to claim 7, characterized in that: Both ends of the outer wall of the outer truss (1) are covered with skins (16) made of fiberglass or aluminum alloy. The skins (16) are bonded to the main chord (12) and the tie rod (15) by sealant and fixed with screws or rivets, thereby forming a closed hybrid structure.

Images