Stretching net fishing boat hull structure with composite hull structure

Abstract

According to the net fishing boat body structure with the composite boat body structure, the middle inner keel is arranged in the middle of the boat body, and the main force bearing frameworks in the supporting parts on the two sides of the boat body are connected through the rib plates, so that the longitudinal bending strength of the boat body can be effectively improved when the fishing boat executes anchoring and weighing operations; therefore, longitudinal structure deformation and transverse position deformation of the ship body are obviously inhibited; the net stretching suspender can rotate flexibly, so that the net stretching operation efficiency is improved; the fishing boat body structure not only has good buoyancy and stability, ensures operation safety under complex sea conditions, but also has excellent durability and strength, meets long-term high-strength operation requirements, and provides an economical, efficient and safe new solution for fishery production.

Description

Technical Field

[0001] The present invention relates to the technical field of fishing appliances, and in particular to a hull structure of a stow net fishing boat with a composite hull structure. Background Art

[0002] The boat-stowed stow net fishing boat uses an anchored hull as a fixed platform and unfolds fishing gear through side stow net booms for fishing operations. To improve fishing efficiency, some boat types adopt the "one boat, two nets" mode, that is, a single boat unfolds two fishing nets for operation simultaneously. This type of operation method has higher requirements for the hull structure strength and anti-overturning stability. The hull structure design of traditional stow net fishing boats adopts the connection form of a single continuous keel and equally spaced ribs, with insufficient lateral support stiffness, resulting in the inability to effectively disperse the concentrated load during the operation of the side stow net boom, stress concentration at the connection between the keel and the rib plate, and easy occurrence of structural cracking; at the same time, the base of the stow net boom is fixed at the position of the side bulwark and is not rigidly connected to the main rib or rib, and the operation load is only borne locally by the bulwark, lacking a framework sharing mechanism, which exacerbates the fatigue damage of the hull; in addition, the hull framework does not have multi-directional cross-support members, with insufficient torsional stiffness, and is prone to twist and deform under the conditions of wind and waves or eccentric loads, seriously affecting the stability of fishing net deployment and operation safety. The above structural defects cause the hull to face problems such as deformation, cracking, and shortened lifespan during frequent operations, restricting the high-intensity fishing efficiency. Summary of the Invention

[0003] The present invention discloses a hull structure of a stow net fishing boat with a composite hull structure to overcome the above technical problems.

[0004] To achieve the above object, the technical solution of the present invention is:

[0005] A hull structure of a stow net fishing boat with a composite hull structure, comprising: a hull, a main mast, two stow net booms, fishing nets, a plurality of rib plates, and a center keel;

[0006] Two sets of support parts and a storage part are arranged inside the hull; the storage part is arranged between the two sets of support parts, and the storage part is provided with a number of fish holds connected in sequence; a main load-bearing framework is arranged inside the support part;

[0007] The center keel is fixedly arranged at the bottom inside the hull, and the center keel is parallel to the traveling direction of the hull;

[0008] The rib plates are fixedly arranged at the bottom inside the hull, the rib plates are perpendicular to the center keel, and both ends of the rib plates are fixedly connected to the main load-bearing frameworks inside the two sets of support parts respectively;

[0009] The main mast is perpendicularly fixed to the bottom of the hull;

[0010] A net winch is fixedly arranged on the top of the deck of the hull;

[0011] The two net spreading booms are respectively arranged on both sides of the hull;

[0012] One end of the net spreading boom is connected to the rotating part of the net spreading boom. The rotating part of the net spreading boom is fixedly connected to the sidewall panel of the hull. The other end of the net spreading boom is connected to the net spreading boom rope; The fishing net is connected to the net spreading boom;

[0013] The net spreading boom rope is connected to the net winch via the top of the main mast;

[0014] When starting fishing, the net spreading boom can rotate in the horizontal and vertical directions with the end connected to the rotating part of the net spreading boom as the center.

[0015] Furthermore, the rotating part of the net spreading boom includes a bushing and a boom shaft;

[0016] The bushing is fixedly connected to the sidewall panel of the hull; The boom shaft is coaxially arranged inside the bushing,

[0017] A limit pin is arranged on the outer wall surface at the bottom of the boom shaft; The limit pin is arranged below the bushing;

[0018] The top of the boom shaft penetrates through and is fixed to the sidewall panel of the hull, and a first connecting piece is fixedly arranged at the top of the boom shaft; The first connecting piece is parallel to the axis of the boom shaft;

[0019] A second connecting piece is arranged at the end of the net spreading boom connected to the rotating part of the net spreading boom; The second connecting piece is parallel to the axis of the net spreading boom;

[0020] The first connecting piece is rotatably connected to the second connecting piece, and the rotating shaft is perpendicular to the first connecting piece.

[0021] Furthermore, the main load-bearing skeleton includes deck beams, second ribs, ribs, vertical supports, deck girders, and side inner keels;

[0022] The side inner keel is fixedly arranged at the bottom inside the hull and is parallel to the middle inner keel;

[0023] The deck beams and deck girders are both fixedly arranged at the bottom of the deck of the hull, and the deck girders are parallel to the middle inner keel; The deck beams and deck girders are perpendicular;

[0024] Both ends of the vertical support are perpendicularly and fixedly connected to the deck girder and the side inner keel respectively;

[0025] The second rib is fixedly arranged at the bottom inside the hull, and one end of the second rib is perpendicularly and fixedly connected to the side inner keel;

[0026] The rib is arranged on the side of the side inner keel away from the middle inner keel, and both ends of the rib are fixedly connected to the deck beam and the second rib plate respectively.

[0027] Furthermore, the bottom plate, side plates, deck and bulwark panel of the hull are all made of HDPE material.

[0028] Furthermore, a fixed pulley is arranged on the main mast;

[0029] The net-hauling boom rope passes through the fixed pulley at the top of the main mast and is respectively connected to the net-hauling machine and the net-hauling boom.

[0030] Beneficial effects: The hull structure of the net-hauling fishing boat with a composite hull structure of the present invention can effectively improve the longitudinal bending strength of the hull when the fishing boat performs anchoring and weighing anchor operations by arranging a middle inner keel in the middle of the hull and connecting the main load-bearing skeletons inside the supporting parts on both sides of the hull through rib plates, thereby significantly suppressing the longitudinal structural deformation and the lateral position deformation of the hull; the net-hauling boom can rotate flexibly, improving the net-hauling operation efficiency; the hull structure of the fishing boat of the present invention not only has good buoyancy and stability, ensuring the operation safety under complex sea conditions, but also has excellent durability and strength, meeting the requirements of long-term high-intensity operations, and providing a new economic, efficient and safe solution for fishery production. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0032] Figure 1 It is a schematic diagram of the overall hull structure of the net-hauling fishing boat of the present invention;

[0033] Figure 2 It is a front view schematic diagram of the hull structure of the net-hauling fishing boat in the embodiment of the present invention;

[0034] Figure 3 It is a schematic diagram of the rotating part of the net-hauling boom in the embodiment of the present invention;

[0035] Figure 4 It is a front view schematic diagram of the main load-bearing skeleton in the embodiment of the present invention;

[0036] Figure 5 It is a schematic diagram of the connection between the main load-bearing skeleton and the bottom of the ship in the embodiment of the present invention;

[0037] Figure 6 Schematic diagram of the mast base in the embodiment of the present invention;

[0038] Figure 7 Schematic diagram of the overall structure of the main load-bearing skeleton in the embodiment of the present invention.

[0039] Wherein: 1. Hull; 11. Bottom plate of the ship; 12. Side plate of the ship; 13. Deck; 14. Bulwark panel; 2. Support part; 21. Deck beam; 22. Second rib plate; 23. Rib; 24. Vertical support; 25. Deck longitudinal girder; 26. Side inner keel; 3. Storage part; 31. Fish hold; 4. Main mast; 41. Fixed pulley; 42. Base pad; 43. Mast base; 44. Diagonal stay; 5. Trawl boom; 51. Trawl boom rope; 52. Bush; 53. Boom shaft; 54. Limit pin; 55. First connecting piece; 56. Second connecting piece; 57. Connecting piece; 7. Rib plate; 8. Center inner keel; 9. Winch; 100. Ship anchor; 101. Anchor chain; 102. Winch; 103. Guide chain roller. Detailed implementation manners

[0040] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0041] This embodiment introduces a hull structure of a trawl fishing boat with a composite hull structure, as Figures 1-7 shown, including: hull 1, main mast 4, two trawl booms 5, fishing net (not labeled in the figure), multiple rib plates 7, and center inner keel 8;

[0042] Two groups of support parts 2 and storage parts 3 are arranged inside the hull 1; the storage part 3 is arranged between the two groups of support parts 2, and the storage part 3 is provided with a number of fish holds 31 connected in sequence; a main load-bearing skeleton is arranged inside the support part 2;

[0043] The center inner keel 8 is fixedly arranged at the bottom inside the hull 1, fixedly connected to the bottom plate 11 of the ship, and the center inner keel 8 is parallel to the traveling direction of the hull 1;

[0044] The rib plate 7 is fixedly arranged at the bottom inside the hull 1, fixedly connected to the bottom plate 11 of the ship, the rib plate 7 is perpendicular to the center inner keel 8, and both ends of the rib plate 7 are fixedly connected to the main load-bearing skeletons inside the two groups of support parts 2;

[0045] The main mast 4 is vertically fixed to the bottom of the hull 1;

[0046] A net winch 9 is fixedly arranged on the top of the deck 13 of the hull 1;

[0047] The two net spreading booms 5 are respectively arranged on both sides of the hull 1;

[0048] One end of the net spreading boom 5 is connected to the net spreading boom rotating part, the net spreading boom rotating part is fixedly connected to the bulwark panel 14 of the hull 1, and the other end of the net spreading boom 5 is connected to the net spreading boom rope 51; The connection with the net spreading boom;

[0049] The net spreading boom rope 51 is connected to the net winch 9 via the top of the main mast 4;

[0050] When starting fishing, the net spreading boom 5 can rotate in the horizontal and vertical directions with one end connected to the net spreading boom rotating part as the center.

[0051] Preferably, the net spreading boom rotating part includes a bushing (steel pipe) 52 and a boom shaft 53;

[0052] The bushing 52 is fixedly connected to the bulwark panel 14 of the hull 1; the boom shaft 53 is coaxially arranged inside the bushing 52,

[0053] A limit pin 54 is arranged on the outer wall surface at the bottom of the boom shaft 53; the limit pin 54 is arranged below the bushing 52;

[0054] The top of the boom shaft 53 penetrates through the bulwark panel 14 of the hull 1, and a first connecting piece 55 is fixedly arranged at the top of the boom shaft 53; the first connecting piece 55 is parallel to the axis of the boom shaft 53;

[0055] A second connecting piece 56 is arranged at the end of the net spreading boom 5 connected to the net spreading boom rotating part; the second connecting piece 56 is parallel to the axis of the net spreading boom 5;

[0056] The first connecting piece 55 is rotatably connected to the second connecting piece 56, and the rotation axis is perpendicular to the first connecting piece 55.

[0057] Specifically, in this embodiment, the boom shaft 53 can rotate inside the bushing 52. To prevent the boom shaft from moving up and down within the bushing, a limit pin 54 is provided on the outer wall surface at the bottom of the boom shaft; holes are provided on both the first connecting piece 55 and the second connecting piece 56, and the first connecting piece 55 and the second connecting piece 56 can be rotationally connected by inserting bolts into the holes. When starting fishing, the net-spreading boom 5 can rotate in a direction parallel to the horizontal plane by rotating the boom shaft 53 in the bushing 52 with the end connected to the gunwale panel 14 of the hull 1 as the center. At the same time, through the rotation of the first connecting piece 55 and the second connecting piece 56, the net-spreading boom can move in a direction perpendicular to the horizontal plane, so that the other end of the boom can enter the water for fishing.

[0058] Preferably, the main load-bearing framework includes deck beams 21, second floor plates 22, ribs 23, vertical supports 24, deck girders 25, and side inner keels 26;

[0059] The side inner keel 26 is fixedly arranged at the bottom inside the hull 1 and is parallel to the middle inner keel 8;

[0060] The deck beams 21 and the deck girders 25 are both fixedly arranged at the bottom of the deck 13 of the hull 1, located at the top inside the hull 1, and the deck girders 25 are parallel to the middle inner keel 8; the deck beams 21 and the deck girders 25 are perpendicular;

[0061] Both ends of the vertical support 24 are perpendicularly and fixedly connected to the deck girder 25 and the side inner keel 26 respectively;

[0062] The second floor plate 22 is fixedly arranged at the bottom inside the hull 1 and is fixedly connected to the bottom plate 11 of the ship. One end of the second floor plate 22 is perpendicularly and fixedly connected to the side inner keel 26;

[0063] The ribs 23 are arranged on the side of the side inner keel 26 away from the middle inner keel 8, and both ends of the ribs 23 are fixedly connected to the deck beam 21 and the second floor plate 22 respectively.

[0064] Specifically, the main load-bearing skeleton of this embodiment takes the H-shaped steel main keel of the steel skeleton framework as the core to ensure the structural strength and operation stability of the hull; the transverse members (including deck beams 21, second floor plates 22, and ribs 23) and longitudinal members (deck girders 25, side inner keels 26) are all made of channel steel, and a space grid-like framework is formed through cross-welding. High-density polyethylene (HDPE) connection substrates are provided on the panels of each steel member. The substrates are fixed to the steel skeleton by high-strength bolts and seamlessly fused with the HDPE hull outer plate through a hot-melt welding process to form a continuous steel-plastic composite interface. This can form a distributed load transfer path between all steel skeleton members and the outer plate, significantly improving the overall bending stiffness and torsional stability of the structure while ensuring the lightweight of the hull, and at the same time avoiding fatigue failure caused by local stress concentration.

[0065] Specifically, the hull outer plate and deck of this embodiment are made of HDPE material, making full use of its excellent corrosion resistance and light weight. This composite structure not only maintains the structural strength of the overall hull but also significantly reduces the maintenance requirements in the marine environment without the need for additional anti-corrosion treatment. In addition, the smooth surface characteristics of the HDPE material help to improve the navigation efficiency, reduce fuel consumption, and thus enhance the economy of the ship.

[0066] Preferably, the bottom plate 11, side plates 12, deck 13, and bulwark panels 14 of the hull 1 are all made of HDPE material.

[0067] Specifically, the hull 1 in this embodiment includes a bottom plate 11, side plates 12, a deck 13, and bulwark panels 14; the bottom plate 11, side plates 12, and deck 13 together form a space capable of accommodating the support part 2 and the storage part 3;

[0068] Preferably, a fixed pulley 41 is provided on the main mast 4;

[0069] The trawl boom rope 51 passes through the fixed pulley 41 at the top of the main mast 4 and is respectively connected to the winch 9 and the trawl boom 5;

[0070] Specifically, in this embodiment, the ship anchor 100 is directly connected to the 102 winch through the anchor chain 101, and the winch 102 is fixed on the hull. Usually, the anchor chain 101 is controlled by the winch for retracting and releasing. Whether it is operating or not, the anchor chain always remains taut.

[0071] Specifically, when the fishing boat is not operating, the ship anchor 100 is suspended below the bow, and the metal rod (anchor shank) of the ship anchor 100 is stuck in the groove of the chain guide roller 103 to prevent the ship anchor 100 from swinging left and right or slipping.

[0072] Specifically, the main mast 4 of the present embodiment is fixedly connected to the center inner keel 8 (H-shaped steel), and is arranged at the position where the center inner keel and the rib are cross-connected, and a base pad 42 is arranged at the bottom; as shown in the figure, it includes a mast base 43, inclined braces 44, etc., and a flange (for connection with the mast base) is welded at the bottom of the main mast 4; the inclined braces 44 are symmetrically distributed around the base and are welded and fixed to the hull structure (ribs, center inner keel) to enhance the stability of the mast.

[0073] Specifically, the lower end of the main mast is inserted into the reserved hole of the mast base, the mast flange is aligned with the base flange, and bolts are inserted into the flange holes and tightened to achieve vertical fixation of the mast; after the lower end of the mast is inserted into the base, the pin is inserted to lock it to prevent the mast and the base from falling out. The inner keel (H-shaped steel) and ribs (channel steel) can disperse the mast load to the hull structure.

[0074] Specifically, the inner keel of this embodiment uses H-shaped steel with the same height as the rib plate to ensure that the structure is evenly stressed. In each cross section, the additional steel member is channel steel. In order to enhance the connection performance between the steel member and the HDPE sheet, a transition connection structure is set between the steel member and the HDPE member. The steel member and the HDPE member are connected by bolts, while the HDPE members are fixed by welding, so as to achieve effective integration of the entire structure. The steel members inside the hull are continuously arranged in the horizontal and vertical directions to form a complete steel structure skeleton. This steel skeleton structure not only provides strong support for the hull, but also effectively makes up for the shortcomings of the HDPE material with low elastic modulus and large deflection, improves the overall rigidity and stability of the hull, and ensures that the hull can maintain a high structural strength when subjected to stress.

[0075] Specifically, the ribs of this embodiment and the second category use HDPE material to connect the I-beams of the inner keel. The web of the I-beam is connected to the strip plate by bolts, the face plate of the HDPE ribs is connected to the face plate of the channel steel by bolts, and the channel steel is fixed to the I-beam by welding. This design realizes the effective connection between the HDPE ribs, the channel steel and the I-beam, ensuring the integrity of the structure and the continuity of load transfer.

[0076] The net-laying fishing boat of this embodiment can be used for fishing in inland waterways. The operation form is to lay nets. According to the optional requirements, it can be used to catch fish, shrimps and other fishery products in the upper and middle waters. The hull is welded and constructed with high-density polyethylene sheets, and has a built-in steel frame structure. There is no external painting, and it is driven by a diesel-powered propeller, with a single engine and a single propeller.

[0077] Specifically, the navigation of the ship in this embodiment is achieved by the main diesel engine driving the stern-mounted paddle through a belt. At this time, the two side trawl booms are placed along the ship's length inside the bow mooring bitts. The cables (trawl boom ropes) connected to the trawl booms are in a taut state to prevent the booms from moving. The ship's anchor is suspended at the bow, and the anchor stock is seated on the chain guide roller. The anchor chain connected to the ship's anchor is in a taut state to prevent the anchor from falling.

[0078] When the ship arrives at the operation area, the main engine is put into neutral to provide power for the winch and the net hauler. Operate the winch to throw the ship's anchor into the water. After fixing the ship, wind the ropes connecting the two side trawl booms onto the rotating shafts on both sides of the net hauler, so that the trawl booms lie across both sides of the hull, maintain the current state, and carry out fishing operations.

[0079] This embodiment has the following beneficial effects:

[0080] In this embodiment, through strengthening component parts such as the centerline inner keel, side inner keel, and deck longitudinal girder, the longitudinal bending strength of the hull is effectively improved when the fishing boat performs anchoring and weighing anchor operations, thus significantly suppressing the longitudinal structural deformation of the hull;

[0081] In this embodiment, through components such as ribs, second floor plates, and deck beams, the transverse structural strength can be provided when the fishing boat is carrying out trawling operations, thereby avoiding the deformation of the hull in the transverse position;

[0082] In this embodiment, through the overall frame-type strengthening structure composed of steel centerline inner keel, side inner keel, ribs, floor plates, deck beams, and deck longitudinal girders, the height of the ship's center of gravity is reduced, thereby improving the stability performance of the ship;

[0083] In this embodiment, through components such as the trawl boom base and the boom rotating shaft, the boom can rotate flexibly, improving the efficiency of trawling operations;

[0084] In this embodiment, through components such as flanges and bolts, the detachable connection between the main mast and the main keel panel can be realized, which is not only convenient for maintenance, but also can efficiently transfer the mast operation load to the main load-bearing.

[0085] In summary, the steel skeleton structure of this embodiment provides a solid support for the hull, effectively solving the problems of small elastic modulus and excessive deflection of HDPE materials, enabling the hull to maintain high stability when stressed and reducing or avoiding deformation. At the same time, compared with all-steel fishing boats, the composite structure of this embodiment reduces the use thickness of HDPE plates while maintaining high strength, thus reducing material costs. At the same time, since no complex anti-corrosion treatment is required, maintenance costs are further saved. At the same time, the composite hull of this embodiment has good buoyancy and stability, ensuring operation safety under complex sea conditions, and also has excellent durability and strength to meet the needs of long-term high-intensity operations. In addition, its recyclability meets environmental protection requirements, providing a new economic, efficient and safe solution for fishery production.

[0086] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A hull structure of a stow net fishing boat with a composite hull structure, characterized in that, Comprising: Hull (1), main mast (4), two net - spreading booms (5), fishing net, multiple rib plates (7), center keel (8); Inside the hull (1), two sets of support parts (2) and a storage part (3) are provided; the storage part (3) is arranged between the two sets of support parts (2), and the storage part (3) is provided with a number of fish holds (31) connected in sequence; inside the support part (2), a main load - bearing skeleton is provided; The center keel (8) is fixedly arranged at the bottom inside the hull (1), and the center keel (8) is parallel to the traveling direction of the hull (1); The rib plates (7) are fixedly arranged at the bottom inside the hull (1), the rib plates (7) are perpendicular to the center keel (8), and both ends of the rib plates (7) are fixedly connected to the main load - bearing skeletons inside the two sets of support parts (2); The main mast (4) is vertically fixed to the bottom of the hull (1); On the top of the deck (13) of the hull (1), a net - hauling machine (9) is fixedly arranged; The two net - spreading booms (5) are respectively arranged on both sides of the hull (1); One end of the net - spreading boom (5) is connected to a net - spreading boom rotating part, the net - spreading boom rotating part is fixedly connected to the bulwark panel (14) of the hull (1), and the other end of the net - spreading boom (5) is connected to a net - spreading boom rope (51); the fishing net is connected to the net - spreading boom; The net - spreading boom rope (51) is connected to the net - hauling machine (9) via the top of the main mast (4); When starting fishing, the net - spreading boom (5) can rotate in the horizontal and vertical directions with the end connected to the net - spreading boom rotating part as the center.

2. The hull structure of a stow net fishing boat with a composite hull structure according to claim 1, characterized in that, The net - spreading boom rotating part includes a bushing (52) and a boom shaft (53); The bushing (52) is fixedly connected to the bulwark panel (14) of the hull (1); the boom shaft (53) is coaxially arranged inside the bushing (52), On the outer wall surface at the bottom of the boom shaft (53), a limit pin (54) is provided; the limit pin (54) is arranged below the bushing (52); The top of the boom shaft (53) passes through and out of the bulwark panel (14) of the hull (1), and a first connecting piece (55) is fixedly arranged at the top of the boom shaft (53); the first connecting piece (55) is parallel to the axis of the boom shaft (53); At the end of the net - spreading boom (5) connected to the net - spreading boom rotating part, a second connecting piece (56) is provided; the second connecting piece (56) is parallel to the axis of the net - spreading boom (5); The first connecting piece (55) is rotatably connected to the second connecting piece (56), and the rotation axis is perpendicular to the first connecting piece (55).

3. The hull structure of a stow net fishing boat with a composite hull structure according to claim 1, characterized in that, The main load - bearing skeleton includes deck girders (21), second rib plates (22), ribs (23), vertical supports (24), deck longitudinal girders (25), side inner keels (26); The side inner keel (26) is fixedly arranged at the bottom inside the hull (1) and is parallel to the center keel (8); The deck beams (21) and deck girders (25) are both fixedly arranged at the bottom of the deck (13) of the hull (1), and the deck girders (25) are parallel to the center keel (8); the deck beams (21) and deck girders (25) are perpendicular to each other; Both ends of the vertical support (24) are perpendicularly and fixedly connected to the deck girder (25) and the side keel (26) respectively; The second floor plate (22) is fixedly arranged at the bottom inside the hull (1), and one end of the second floor plate (22) is perpendicularly and fixedly connected to the side keel (26); The rib (23) is arranged on the side of the side keel (26) away from the center keel (8), and both ends of the rib (23) are fixedly connected to the deck beam (21) and the second floor plate (22) respectively.

4. The hull structure of a stow net fishing boat with a composite hull structure according to claim 1, characterized in that, The bottom plate (11), side plates (12), deck (13) and bulwark panel (14) of the hull (1) are all made of HDPE material.

5. The hull structure of a stow net fishing boat with a composite hull structure according to claim 1, characterized in that, A fixed pulley (41) is arranged on the main mast (4); The trawl boom rope (51) passes through the fixed pulley (41) at the top of the main mast (4) and is respectively connected to the winch (9) and the trawl boom (5).

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