Hydrodynamic lifting sail for variable water layer trawl

Abstract

The invention discloses a hydrodynamic lift sail for a variable-water-layer trawl. The hydrodynamic lift sail comprises at least two canvas bodies connected to the upper side of the front end of the trawl side by side. The canvas body is V-shaped and is opened towards the direction of the opening at the front end of the trawl net; a floating body structure is connected above the front end of the canvas body; the lower portion of the canvas body is connected to the upper side of the front end of the trawl net, a through lower opening is formed in the lower portion of the canvas body and used for allowing water flow to penetrate through, and the canvas body generates certain lifting force under the action of the water flow. The lift sail can generate hydrodynamic efficiency under different dragging speed conditions, so that the vertical expansion performance of the trawl net is ensured, the trawl net is not limited by the working water depth, the settling speed is high, the existing static buoyancy floater can be well replaced, and the fishing production efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of fishing gear, in particular to a water-dynamic lifting sail for a variable water layer trawl. Background Art

[0002] In marine fisheries, mid-water trawling is one of the main operating methods. Since the 1980s, my country has successively introduced more than 20 large-scale ocean-going trawling processing ships with a capacity of more than 3,000 Gt to catch cod, horse mackerel, sardines and other pelagic fish in the Bering Sea, the Sea of ​​Okhotsk, New Zealand, Mauritania, Namibia and the offshore waters of Chile. Most of the nets are rope four-piece trawls. The horizontal expansion of the trawl mainly refers to the distance between the sleeve ends of the trawl, which is mainly achieved by rigid mesh plates; the vertical expansion of the trawl refers to the height of the net mouth, and its buoyancy uses hard plastic static buoyancy floats, and the sinking force uses materials with a large sinking rate to achieve vertical expansion of the net mouth during towing.

[0003] At present, when trawling in the middle layer, the floats are arranged in the middle of the float line in the form of float rows. In the production of trawling, the buoyancy of the net needs to be adjusted, especially the buoyancy adjustment, that is, by increasing or decreasing the static buoyancy, the working water layer of the net and the vertical expansion of the net are adjusted. The adjustment of static buoyancy is time-consuming and troublesome. The buoyancy of static floats is also limited by the pressure-resistant water depth and prolongs the time of net release, which affects the improvement of economic benefits. Summary of the invention

[0004] The purpose of the present invention is to provide a variable water layer trawl hydrodynamic lift sail which is not restricted by the operating water depth and has a fast sinking speed, so as to replace the existing static buoyancy float and improve the fishing production efficiency.

[0005] The object of the present invention is achieved as follows: A hydrodynamic lift sail for a variable water layer trawl comprises at least two sailcloth bodies connected side by side to the upper side of the front end of the trawl;

[0006] Based on the side view, the canvas body is V-shaped and opens toward the front opening of the trawl;

[0007] A floating structure is connected to the upper side of the front end of the canvas body;

[0008] The lower part of the canvas body is connected to the upper side of the front end of the trawl, and a through lower opening is provided at the lower part of the canvas body. The lower opening is used for passing water flow, so that the canvas body generates a certain lift under the action of the water flow.

[0009] Furthermore, the canvas body is connected to a plurality of ropes, and the two ends of the ropes are respectively connected to the upper and lower edges of the front end of the canvas body, so that the canvas body can be opened at a preset angle.

[0010] Furthermore, the lower opening is located at the center of the lower part of the canvas body.

[0011] Furthermore, the floating structure on the upper front end of the canvas body is configured as a floating ball gang, and the floating ball gang has a plurality of floating balls arranged along the length direction of the upper front end of the canvas body.

[0012] Furthermore, the canvas body is connected with a high-strength polyester webbing for reinforcement.

[0013] Furthermore, a silicone coating is fixedly attached to the surface of the canvas body.

[0014] The beneficial effects of the present invention are:

[0015] The lift sail can generate hydrodynamic efficiency under different towing speed conditions, thereby ensuring the vertical expansion performance of the trawl, which is not restricted by the operating water depth and has a fast sinking speed. It can well replace the existing static buoyancy float and improve fishing production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is the overall arrangement diagram of the present invention.

[0017] Figure 2 It is a schematic diagram of the three-dimensional structure of the canvas body.

[0018] Figure 3 It is a side view schematic diagram of the present invention.

[0019] Figure 4 This is a simplified diagram of the production of a lift sail unit.

[0020] Explanation of the accompanying drawings: 1- canvas body; 11- lower opening; 2- trawl; 3- buoyancy line; 4- rope body; 5- high-strength polyester webbing. DETAILED DESCRIPTION

[0021] The following will be combined with the attached embodiment of the present invention Figure 1-4 , the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] like Figure 1-3 As shown, in view of the technical problem that the buoyancy of hard static floats in the prior art is not very suitable for variable water layer trawl, the purpose of the present invention is to provide a hydrodynamic lift sail for variable water layer trawl, which can randomly adjust the operating water layer of the variable water layer trawl and the vertical expansion of its net mouth, while increasing the sinking speed of the net.

[0023] This embodiment provides a hydrodynamic lift sail for a variable water layer trawl, comprising two canvas bodies 1 connected side by side to the upper side of the front end of the trawl 2 .

[0024] Based on the side view, Figure 3 As shown, the canvas body 1 is V-shaped and opens toward the front end opening of the trawl.

[0025] The front end of the canvas body 1 is connected to a floating structure; the floating structure on the front end of the canvas body 1 is set as a floating ball group 3, and the floating ball group 3 has a plurality of floating balls arranged along the side length direction of the front end of the canvas body 1.

[0026] The lower part of the canvas body 1 is connected to the upper side of the front end of the trawl 2; the lower part of the canvas body 1 is provided with a through lower opening 11, which is used to pass water flow, so that the canvas body 1 generates a certain lift under the action of the water flow. The lift sail generates hydrodynamic efficiency under different towing speed conditions, thereby ensuring the vertical expansion performance of the trawl 2, which is not restricted by the operating water depth.

[0027] The canvas body 1 is connected to a plurality of rope bodies 4, which are made of high-strength materials and can be selected according to specific conditions, and are not limited here. The two ends of the rope body 4 are respectively connected to the upper and lower edges of the front end of the canvas body 1, so that the canvas body 1 is opened at a preset angle. The angle can be 25°, and other angles are also included.

[0028] The lower opening 11 is located at the lower center of the canvas body 1 .

[0029] The above-mentioned canvas body 1 is connected with a high-strength polyester webbing 5 for reinforcement, and the canvas body 1 is reinforced by the high-strength polyester webbing 5 to meet the use requirements.

[0030] The canvas body 1 is made of UHMWPE / PA / GF woven canvas, and a silicone coating is fixedly attached to the surface of the canvas body 1. After coating, it is cured at a medium and low temperature, and the thickness of the canvas after coating is 5mm. The canvas body 1 can withstand a high breaking strength and Young's modulus, and has the characteristics of smoothness, wear resistance, and pressure resistance.

[0031] This embodiment can generate the required lift under different towing speed conditions, and the net can operate in different operating water layers. Its sinking speed is significantly faster than that of the net using static buoyancy floats.

[0032] The fixed rope of the lift sail is made of Dyneema ultra-high-strength material, which greatly enhances the breaking strength of the fixed rope and reduces the elongation, ensuring the accuracy of the lift sail's working angle to the water and improving the stability of the lift sail.

[0033] The lift sail of this embodiment has a headwind area of ​​0.4m 2The initial working angle of attack of the dustpan-shaped lift sail is 25°. A through lower opening 11 is provided in the center of the lower part of the canvas body 1. The lower opening 11 is used to pass the water flow, so that the canvas body 1 generates a certain lift under the action of the water flow, that is, the water flow has an upward attack angle on the canvas; three single lift sails can be combined into a whole, and two groups of lift sails are set at the middle-layer trawl net mouth.

[0034] The lift sail generates various lifts under the action of different water currents. The lifts under different towing speeds are shown in Table 1, which stabilizes the net in a certain water layer.

[0035] Table 1:

[0036]

[0037]

[0038] The hydrodynamic lift sail of the present invention can be made into lift sails of different sizes according to the size of the mid-layer trawl. The following takes the size of 154.8m×640m-90.2m net used by a fishing boat with a main engine power of 735KW as an example to illustrate the specific implementation scheme.

[0039] like Figure 4 The figure shows a schematic diagram of the manufacturing of a lift sail unit. The canvas is cut, and the canvas body 1 is sealed with a high-strength polyester webbing 5 (breaking strength>30KN) to reinforce it into a unit, thereby enhancing the structural strength of the canvas body 1 and enabling it to have a good load-bearing capacity. The lift sail assembly consists of three such units, and four hard plastic floats (constituting the buoyancy ball 3) are arranged on the top, each with a static buoyancy of 5 kg.

[0040] like Figure 1 , 3 As shown, two groups of lifting sails are set in the middle of the floating rope, the lower rope of the lifting sail is tied to the floating rope, and the upper rope and back rope of the lifting sail are connected to the oblique side of the mesh. They are of different lengths to ensure that the lifting sail is in an initial working angle of 25°. The lifting sail generates hydrodynamic efficiency under different towing speed conditions, thereby ensuring the vertical expansion performance of the trawl, which is not restricted by the operating water depth.

[0041] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "front", "back" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention; in the present invention, it should also be noted that the terms "installation" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, an integrally formed connection, a mechanical connection, or an indirect connection through an intermediate connecting component, and the specific meaning of the terms in this utility model can be understood according to the specific circumstances.

[0042] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-limiting from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention, and any reference numerals in the claims should not be regarded as limiting the claims involved.

[0043] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A hydrodynamic lift sail for variable water layer trawl, characterized in that: It comprises at least two canvas bodies (1) connected side by side to the upper side of the front end of the trawl net (2); Based on the side view, the canvas body (1) is V-shaped and opens toward the front opening of the trawl; The upper front end of the canvas body (1) is connected to a floating structure; The lower part of the canvas body (1) is connected to the upper side of the front end of the trawl net (2), and a through lower opening (11) is provided at the lower part of the canvas body (1). The lower opening (11) is used to pass water flow, so that the canvas body (1) generates a certain lift under the action of the water flow.

2. The variable water layer trawl hydrodynamic lift sail according to claim 1, characterized in that: The canvas body (1) is connected to a plurality of rope bodies (4), and the two ends of the rope bodies (4) are respectively connected to the upper and lower edges of the front end of the canvas body (1), so that the canvas body (1) is opened at a preset angle.

3. The variable water layer trawl hydrodynamic lift sail according to claim 1, characterized in that: The lower opening (11) is located at the center of the lower part of the canvas body (1).

4. The variable water layer trawl hydrodynamic lift sail according to claim 1, characterized in that: The floating structure on the upper front end of the canvas body (1) is configured as a floating ball group (3), and the floating ball group (3) has a plurality of floating balls arranged along the length direction of the upper front end of the canvas body (1).

5. The variable water layer trawl hydrodynamic lift sail according to claim 1, characterized in that: The canvas body (1) is connected to a high-strength polyester webbing (5) for reinforcement.

6. The variable water layer trawl hydrodynamic lift sail according to claim 5, characterized in that: A silicone coating is fixedly attached to the surface of the canvas body (1).

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