A floating gillnet

Abstract

The present invention discloses a floating gillnet, aiming to provide a floating gillnet that can effectively solve the problem in the prior art that after the floating gillnet sinks to the seabed, a large part of the netting still floats in the water under the action of the floats, resulting in ghost fishing on the seabed and damaging the seabed ecological environment. It includes: a netting, the upper edge of the netting is the upper net line, and the lower edge of the netting is the lower net line; a plurality of netting weights, the netting weights are connected to the lower net line; a plurality of floats, the floats are connected to the upper net line, the floats are hollow floats, and they have a sealed inner cavity. A strength-weakening area is provided on the side wall of the float, and the structural strength of the strength-weakening area on the side wall of the float is lower than that of the other parts of the side wall of the float. When the float sinks to a set depth underwater, the strength-weakening area on the side wall of the float is broken by the water pressure, so that the outside water enters the sealed inner cavity of the float.

Description

Technical Field

[0001] The invention relates to the field of fishing nets, and in particular to a floating gillnet. Background Art

[0002] Floating gillnets are rectangular meshes woven from one or more layers of plastic yarn. Attached to the upper edge of the net are multiple floats, and to the lower edge are multiple weights, allowing the net to be vertically opened near sea level, waiting for fish to swim in and become entangled in the mesh. Currently, floating gillnets are often abandoned by fishermen in the sea due to damage to the net during use. Over time, some of the floats on these abandoned gillnets can become detached or damaged, causing the nets to sink to the seabed under the action of the weights. After sinking to the seabed, a large portion of the net remains floating in the water due to the action of the floats, causing ghost fishing and damaging the seabed ecosystem.

[0003] In order to solve the above problems, some inventors have made improvements. After the floating gill net sinks to the seabed, the heavy hammer is released to make the floating gill net float up again, so as to solve the problem of ghost fishing on the seabed.

[0004] For example, Chinese patent publication number CN105557644A, published on May 11, 2016, is titled "A Floating Barb Net for Easy Salvage." The application discloses a floating barbed net in which a cylindrical counterweighted iron plate is corroded by seawater for a long period of time, and the iron plate at the bottom of the annular thinning groove can be corroded and penetrated by seawater within approximately one year. When the annular thinning groove is corroded and penetrated by seawater, the floating barbed net floats.

[0005] For example, Chinese patent publication number CN106922633A, publication date September 13, 2019, is an invention titled "A Gillnet Fishing Device," comprising a floating gillnet and a plurality of self-detaching weights. The self-detaching weights automatically detach after the gillnet fishing device sinks to the seabed, allowing the floating gillnet to float up again, thereby solving the problem of seabed ghost fishing.

[0006] After sinking to the seabed, these current floating gillnets are refloated by releasing a weight. This can improve the problem of seabed ghost fishing to a certain extent. However, in actual use, many floats are often damaged, resulting in the floating gillnet still not being able to float even after the weight is released. Instead, the net is easily floating on the seabed, exacerbating the problem of seabed ghost fishing. Summary of the Invention

[0007] The purpose of the present invention is to provide a floating gill net, which can effectively solve the problem in the prior art that after the floating gill net sinks to the seabed, a large part of the net still floats in the water under the action of the float, causing ghost fishing on the seabed and destroying the seabed ecological environment.

[0008] The technical solution of the present invention is:

[0009] A floating gillnet, comprising:

[0010] Mesh, the upper edge of the mesh is the upper mesh, and the lower edge of the mesh is the lower mesh;

[0011] Several mesh counterweights are connected to the lower netting frame, and the mesh counterweights are distributed in sequence along the length direction of the lower netting frame;

[0012] A plurality of floats are connected to the net mesh, and the floats are distributed in sequence along the length direction of the net mesh. The floats are hollow floats with a sealed inner cavity. A strength weakening area is provided on the side wall of the float. The structural strength of the strength weakening area of the float side wall is lower than the structural strength of the other parts of the float side wall. When the float sinks to a set depth underwater, the strength weakening area of the float side wall is crushed by water pressure, so that water from the outside enters the sealed inner cavity of the float. In this way, in the process of the floating gill net of this scheme sinking to the seabed, when the floating gill net sinks to the set depth, the strength weakened area of the side wall of the float will be broken by the water pressure, so that the outside water enters the closed inner cavity of the float; in this way, after the floating gill net sinks to the seabed, the air in the closed inner cavity of all the floats on the floating gill net is discharged, and the outside seawater fills the closed inner cavity of the float, and the gravity of the float will be greater than the buoyancy, so that the float also sinks to the bottom of the seabed, so that the mesh of the floating gill net will sink to the bottom of the seabed under the action of gravity (the mesh of the floating gill net will not float in the water), thereby effectively solving the problem in the prior art that after the floating gill net sinks to the seabed, a large part of the mesh is still floating in the water under the action of the float, causing seabed ghost fishing and destroying the seabed ecological environment.

[0013] In addition, compared with the prior art of "using a floating gill net to sink to the bottom of the sea and releasing a heavy hammer to solve the problem of underwater ghost fishing", the floating gill net of this solution takes the opposite approach of "using a floating gill net to sink to the bottom of the sea and destroying the hollow float to solve the problem of underwater ghost fishing". It eliminates the complex structure of releasing the heavy hammer, effectively simplifies the structure, and reduces production costs. Moreover, the floating gill net will not be unable to float up even after releasing the heavy hammer due to damage to a large number of floats, but will cause the net to easily float and flow on the seabed, thereby exacerbating the problem of underwater ghost fishing.

[0014] Preferably, the thickness of the weakened area of the float side wall is smaller than the thickness of the rest of the float side wall. In this way, the weakened area is formed on the float side wall by changing the wall thickness, which has a simple structure and is easy to manufacture.

[0015] Preferably, a thinning groove is provided on the side wall surface of the float, and the area of the float side wall where the thinning groove is located constitutes the strength weakened area. In this way, by providing the thinning groove on the side wall surface of the float to form the strength weakened area, its structure is simple and easy to manufacture.

[0016] Preferably, an annular frangible groove is further provided on the side wall of the float where the strength weakening area is located. In this way, when the floating gillnet sinks to the set depth, when the strength weakening area on the side wall of the float is broken by the water pressure, the side wall of the float located in the annular frangible groove will be integrally damaged by the water pressure.

[0017] Preferably, the cross-section of the annular frangible groove is V-shaped.

[0018] Preferably, the strength weakening area is located at the top of the side wall of the float. In this way, when the floating gillnet sinks to the set depth, after the strength weakening area on the side wall of the float is broken by the water pressure, it is beneficial to discharge the air in the sealed inner cavity of the float, and the outside seawater fills the sealed inner cavity of the float.

[0019] Preferably, the floats correspond one by one to the net sheet weights, and an elastic connecting rope is further provided between the float and the corresponding net sheet weight. The elastic connecting rope connects the upper net rope and the lower net rope. In this way, during normal use, under the action of the floats and the net sheet weights, the elastic connecting rope is pulled to expand the net sheet, without affecting the normal use of the floating gillnet. After the floating gillnet sinks to the seabed, since the floats are broken by the water pressure and sink, at this time the elastic connecting rope shrinks, which can drive the net sheet to shrink, further avoiding the problem of ghost fishing on the seabed caused by the net sheet floating under the action of water flow.

[0020] Preferably, a float weight is provided on the float, and the buoyancy of the float is greater than the gravity of the float weight.

[0021] Preferably, the float includes a lower floating body and an upper floating body. The upper floating body is a conical floating body with an outer diameter gradually increasing from bottom to top. A plurality of lift plates are sequentially distributed on the outer side surface of the upper floating body from bottom to top. One or more lift holes are provided on the lift plates. The lift holes penetrate the upper and lower surfaces of the lift plates, and the cross-sectional area of the lift holes gradually decreases from bottom to top. The current spherical floats (including other cylindrical floats, etc.) have the following deficiencies. Under the impact of water flow, the lower half (about 1 / 4 of the spherical surface) facing the flow is below the water surface and can generate upward buoyancy, while the upper half spherical surface facing the flow is above the water surface and is affected by the water flow impact, which will generate downward pressure, resulting in partial or even complete cancellation of the buoyancy of the spherical float, affecting its use effect in the water flow environment. To solve this problem, the float is improved in this solution. Specifically,

[0022] During actual use, the lower floating body is located underwater, and the upper floating body is located above the water surface. When the upstream upper floating body is impacted by the water flow, the water flow will flow upward along the outer side surface of the conical floating body. After the upward flowing water flow encounters the lift fins, it will flow upward along the lift holes (the horizontally flowing water flow flows in from the interval spaces between the lift fins, and after encountering the conical floating body, the water flow will flow upward along the outer side surface of the conical floating body). According to the principle of fluid mechanics, the water flow entering from the large opening and flowing out from the small opening will generate a vertically upward lift force (equivalent to buoyancy), so as to utilize the impact of the water flow to increase the upward lift force of the float, enabling it to better adapt to use in a water flow environment, and effectively solving the problem that the impact of the water flow offsets the buoyancy of the floating ball and affects the use effect of the floating ball in a water flow environment.

[0023] Preferably, the bottom of the lower floating body is connected to the upper fishing net rope.

[0024] The beneficial effect of the present invention is that it can effectively solve the problem that after the floating gillnet in the prior art sinks to the seabed, a large part of the netting of the floating gillnet still floats in the water under the action of the floats, resulting in ghost fishing on the seabed and damaging the seabed ecological environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic structural diagram of a floating gillnet according to a specific embodiment I of the present invention.

[0026] Figure 2 is a schematic structural diagram of a float of a floating gillnet according to a specific embodiment I of the present invention.

[0027] Figure 3 is a schematic structural diagram of a floating gillnet according to a specific embodiment II of the present invention.

[0028] Figure 4 is a schematic structural diagram of a float of a floating gillnet according to a specific embodiment II of the present invention.

[0029] In the figure:

[0030] Netting 1;

[0031] Upper fishing net rope 2.1, lower fishing net rope 2.2;

[0032] Elastic connecting rope 3;

[0033] Counterweight 4;

[0034] Float 5, lower floating body 5.1, upper floating body 5.2;

[0035] Strength weakening area 6;

[0036] Thinning groove 7;

[0037] Annular easily broken groove 8;

[0038] Lifting blade 9;

[0039] Lift hole 10. DETAILED DESCRIPTION

[0040] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments:

[0041] Specific embodiment 1, as Figure 1 、 Figure 2 As shown, a floating gillnet comprises a mesh 1, several mesh weights 4, and several floats 5. The upper edge of the mesh forms an upper mesh line 2.1, and the lower edge of the mesh forms a lower mesh line 2.2. The mesh weights are connected to the lower mesh line, and the mesh weights are sequentially distributed along the length of the lower mesh line. The floats are connected to the upper mesh line, and the floats are sequentially distributed along the length of the upper mesh line. The floats are hollow and have a sealed interior. A weakened area 6 is provided on the sidewall of the float. The structural strength of this weakened area is lower than that of the rest of the float sidewall (the rest of the float sidewall refers to the area of the float sidewall outside the weakened area). When the float sinks to a set depth underwater, the weakened area of the float sidewall is ruptured by water pressure, allowing external water to enter the sealed interior of the float.

[0042] During the process of the floating gill net of this embodiment sinking to the seabed, when the floating gill net sinks to a set depth, the weakened strength area of the side wall of the float will be broken by water pressure, so that water from the outside will enter the closed inner cavity of the float; in this way, after the floating gill net sinks to the seabed, the air in the closed inner cavity of all the floats on the floating gill net is discharged, and the closed inner cavity of the float is filled with seawater from the outside. The gravity of the float will be greater than the buoyancy, causing the float to also sink to the bottom surface of the seabed. In this way, the mesh of the floating gill net will sink to the bottom surface of the seabed under the action of gravity (the mesh of the floating gill net will not float in the water), thereby effectively solving the problem in the prior art that after the floating gill net sinks to the seabed, a large part of the mesh is still floating in the water under the action of the floats, causing ghost fishing on the seabed and damaging the seabed ecological environment.

[0043] In addition, compared with the prior art of "using a floating gill net to sink to the bottom of the sea and releasing a heavy hammer to solve the problem of underwater ghost fishing", the floating gill net of this solution takes the opposite approach of "using a floating gill net to sink to the bottom of the sea and destroying the hollow float to solve the problem of underwater ghost fishing". It eliminates the complex structure of releasing the heavy hammer, effectively simplifies the structure, and reduces production costs. Moreover, the floating gill net will not be unable to float up even after releasing the heavy hammer due to damage to a large number of floats, but will cause the net to easily float and flow on the seabed, thereby exacerbating the problem of underwater ghost fishing.

[0044] Further, such as Figure 2As shown, the wall thickness of the strength weakening area 6 on the side wall of the float is smaller than that of the remaining parts of the side wall of the float (the remaining parts of the side wall of the float refer to the parts of the side wall of the float outside the strength weakening area). In this way, by changing the wall thickness, a strength weakening area is formed on the side wall of the float, and its structure is simple and easy to manufacture.

[0045] Furthermore, as Figure 2 shown, a thinning groove 7 is provided on the surface of the side wall of the float, and the area of the side wall of the float where the thinning groove is located constitutes the strength weakening area. In this embodiment, the thinning groove is provided on the inner wall surface of the float. In this way, by providing a thinning groove on the surface of the side wall of the float to form a strength weakening area, its structure is simple and easy to manufacture.

[0046] Furthermore, as Figure 2 shown, an annular breakable groove 8 is further provided on the side wall of the float where the strength weakening area is located. In this embodiment, the cross-section of the annular breakable groove is V-shaped, and the annular breakable groove is located on the bottom surface of the thinning groove. In this way, when the floating gillnet sinks to the set depth, when the strength weakening area on the side wall of the float is broken by water pressure, the side wall of the float located in the annular breakable groove will be integrally damaged by water pressure.

[0047] Furthermore, as Figure 2 shown, the strength weakening area 6 is located at the top of the side wall of the float. In this way, when the floating gillnet sinks to the set depth, after the strength weakening area on the side wall of the float is broken by water pressure, it is beneficial to discharge the air in the sealed inner cavity of the float, and the outside seawater fills the sealed inner cavity of the float.

[0048] Furthermore, a float counterweight is provided on the float, and the buoyancy of the float is greater than the gravity of the float counterweight.

[0049] Furthermore, as Figure 1 shown, the floats correspond to the net sheet counterweights one by one. An elastic connecting rope 3 is also provided between the float and the corresponding net sheet counterweight. The elastic connecting rope connects the upper net rope and the lower net rope. A number of connection points are provided between the elastic connecting rope and the net sheet. In this embodiment, the elastic connecting rope is a rubber band. During the normal use of the floating gillnet, the floating gillnet floats on the water surface under the action of the float and the net sheet counterweight. At the same time, under the action of the float and the net sheet counterweight, the elastic connecting rope is pulled, so that the net sheet unfolds, without affecting the normal use of the floating gillnet. After the floating gillnet sinks to the seabed, since the float is broken by water pressure and sinks, at this time the elastic connecting rope contracts, which can drive the net sheet to contract, further avoiding the problem of ghost fishing on the seabed caused by the net sheet floating under the action of water flow.

[0050] Specific Embodiment 2, the remaining structures of this embodiment refer to Specific Embodiment 1, and the difference is that

[0051] As Figure 3 、 Figure 4As shown, the float 5 includes a lower floating body 5.1 and an upper floating body 5.2, wherein the upper floating body is a conical floating body with an outer diameter gradually increasing from bottom to top. A number of lift fins 9 are arranged on the outer side surface of the upper floating body in sequence from bottom to top. One or more lift holes 10 are provided on the lift fins, the lift holes penetrate the upper and lower surfaces of the lift fins, and the cross-sectional area of the lift holes gradually decreases from bottom to top.

[0052] The current spherical floats (including other cylindrical floats, etc.) have the following deficiencies. Under the impact of water flow, the lower half of the spherical float facing the flow (about 1 / 4 of the spherical surface) is below the water surface and can generate an upward buoyancy force, while the upper half of the spherical surface facing the flow is above the water surface and is affected by the water flow impact, which will generate a downward pressure, resulting in partial or even complete cancellation of the buoyancy force of the spherical float, affecting its use effect in the water flow environment. To solve this problem, the float in this solution is improved. Specifically,

[0053] During actual use, the lower floating body is underwater and the upper floating body is above the water surface. When the upper floating body facing the flow is affected by the water flow impact, the water flow will flow upward along the outer side surface of the conical floating body. When the upward flowing water flow encounters the lift fins, it will flow upward along the lift holes (the horizontally flowing water flow flows in from the interval space between the lift fins and will flow upward along the outer side surface of the conical floating body when it encounters the conical floating body). According to the principle of fluid mechanics, the water flow entering from the large opening and flowing out from the small opening will generate a vertically upward lift force (equivalent to the buoyancy force), so as to use the water flow impact to increase the upward lift force of the float, enabling it to better adapt to use in the water flow environment and effectively solving the problem that the water flow impact cancels the buoyancy force of the floating ball and affects the use effect of the floating ball in the water flow environment.

[0054] In this embodiment, the top of the upper floating body is a plane. The strength weakening area is set at the top of the upper floating body.

[0055] The bottom of the lower floating body is connected to the upper fishing net. The lower floating body is hemispherical.

[0056] In one implementation manner of this embodiment, the lift fins are annular and the lift fins are coaxially distributed with the upper floating body. A number of the lift holes are provided on the same lift fin, and the lift holes on the same lift fin are evenly distributed around the circumferential direction of the lift fin.

[0057] In another implementation manner of this embodiment, the lift fins are distributed into several layers from bottom to top. The lift fins in the same layer include several lift fins evenly distributed around the circumferential direction of the upper floating body, and each lift fin is provided with a lift hole.

[0058] The above is only a preferred embodiment of the present invention and does not impose any limitation on the present invention. Any simple modification, change, and equivalent transformation made to the above embodiments according to the technical essence of the present invention still fall within the protection scope of the technical solution of the present invention.

Claims

1. A floating gillnet, characterized in that it comprises: A net sheet, the upper edge of the net sheet being the upper net line, and the lower edge of the net sheet being the lower net line; A plurality of net sheet weights, the net sheet weights being connected to the lower net line, and the net sheet weights being sequentially distributed along the length direction of the lower net line; A plurality of floats, the floats being connected to the upper net line, and the floats being sequentially distributed along the length direction of the upper net line. The floats are hollow floats with a sealed inner cavity. A strength-weakening area is provided on the side wall of the float, and the structural strength of the strength-weakening area on the side wall of the float is lower than that of the other parts of the side wall of the float. When the float sinks to a set depth underwater, the strength-weakening area on the side wall of the float is broken by water pressure so that the outside water enters the sealed inner cavity of the float.

2. A floating gillnet according to claim 1, characterized in that, The wall thickness of the strength-weakening area on the side wall of the float is smaller than the wall thickness of the other parts of the side wall of the float.

3. The floating gillnet according to claim 2, characterized in that, A thinning groove is provided on the surface of the side wall of the float, and the area of the side wall of the float where the thinning groove is located constitutes the strength-weakening area.

4. A floating gillnet according to claim 1 or 2 or 3, characterized in that, An annular breakable groove is further provided on the side wall of the float where the strength-weakening area is located.

5. A floating gillnet according to claim 4, characterized in that, The cross section of the annular breakable groove is V-shaped.

6. A floating gillnet according to claim 1 or 2 or 3, characterized in that The strength-weakening area is located at the top of the side wall of the float.

7. A floating gillnet according to claim 1 or 2 or 3, characterized in that, The floats correspond to the net sheet weights one by one, and an elastic connecting rope is further provided between the float and the corresponding net sheet weight. The elastic connecting rope connects the upper net line and the lower net line.

8. A floating gillnet according to claim 1 or 2 or 3, characterized in that, A float weight is provided on the float, and the buoyancy of the float is greater than the gravity of the float weight.

9. A floating gillnet according to claim 1 or 2 or 3, characterized in that, The float comprises a lower float body and an upper float body. The upper float body is a conical float body with an outer diameter gradually increasing from bottom to top. A plurality of lift fins are sequentially distributed from bottom to top on the outer side surface of the upper float body. One or more lift holes are provided on the lift fins. The lift holes penetrate the upper and lower surfaces of the lift fins, and the cross-sectional area of the lift holes gradually decreases from bottom to top.

10. A floating gillnet according to claim 9, characterized in that, The bottom of the lower float body is connected to the upper net line.

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