阅读说明：本技术 一种应用于海洋渔业工程的网内防挤压渔船拖网装置 (Be applied to ocean fishery engineering's interior extrusion fishing boat trawl net device of preventing of net ) 是由 于瑞风 于 2021-09-08 设计创作，主要内容包括：本发明公开了一种应用于海洋渔业工程的网内防挤压渔船拖网装置,属于海洋工程装备技术领域。包括牵引结构、捕捞结构、内腔分区结构及螺旋驱动结构；通过牵引结构将船体结构与捕捞结构传动相连,使得捕捞结构在水下能够跟随船体结构同步前进完成捕捞；在捕捞过程中,螺旋驱动结构能够随着捕捞结构同步前进,且螺旋驱动结构在前进时能够受力自动产生旋转动能,并将旋转动能传递至捕捞结构的内部水中,使水受拨动螺旋向后流动,进入捕捞结构内的渔获物随螺旋向后流动的水流逐步被分流至由内腔分区结构分隔捕捞结构内部形成的若干个不同位置,提高了渔获物在捕捞结构内的分散程度,有效降低了渔获物集中至捕捞结构的后部造成挤压变质的可能性。(The invention discloses a trawl net device of a fishing boat capable of preventing extrusion in a net, which is applied to ocean fishery engineering and belongs to the technical field of ocean engineering equipment. Comprises a traction structure, a catching structure, an inner cavity partition structure and a spiral driving structure; the hull structure is in transmission connection with the catching structure through the traction structure, so that the catching structure can synchronously move forward along with the hull structure under water to finish catching; in the fishing process, the spiral driving structure can advance along with the fishing structure is synchronous, and the spiral driving structure can be stressed to automatically generate rotary kinetic energy when advancing, and the rotary kinetic energy is transmitted to the inside water of the fishing structure, so that the water flows backwards by stirring the spiral, the fishing objects entering the fishing structure are gradually shunted to a plurality of different positions formed inside the fishing structure by separating the fishing structure through the inner cavity partition structure along with the water flow flowing backwards by the spiral, the dispersion degree of the fishing objects in the fishing structure is improved, and the possibility that the fishing objects are concentrated to the rear part of the fishing structure to cause extrusion deterioration is effectively reduced.)

1. A net internal anti-extrusion fishing boat trawl device applied to marine fishery engineering is arranged on a hull structure, and a rope roller is rotatably arranged on the hull structure; the method is characterized in that: the trawl apparatus comprises a traction structure, a catching structure, an inner cavity partition structure and a spiral driving structure;

the traction structure is wound on the outer side of the rope roller, a release end is arranged on the outer side of the rope roller, and the extension length between the release end and the hull structure is adjustable through the rope roller;

the inlet part of the catching structure is fixedly connected with the releasing end, and the tail part of the catching structure is positioned at one side of the inlet end of the catching structure, which is far away from the hull structure; an accommodating inner cavity is arranged between the inlet part and the tail part of the catching structure;

the inner cavity partition structure is arranged on two sides of the inner part of the accommodating inner cavity and can divide the two sides of the inner part of the accommodating inner cavity into a plurality of partition spaces;

the spiral driving structure comprises a windmill type water wheel and a spiral driving rod;

the windmill type water wheel is provided with a central shaft, and the central shaft of the windmill type water wheel is rotatably arranged at the tail part of the fishing structure; the spiral driving rod is in transmission connection with the central shaft and extends to the inner center of the accommodating inner cavity; the windmill type water wheel can rotate under the action of the impulse force of water flow in the front direction, and the spiral driving rod can generate backward spiral water flow around the spiral driving rod when rotating.

2. The device of claim 1, wherein the towing structure comprises two main towing rope bodies and two component towing rope bodies;

one end of each of the two main traction rope bodies is connected with the rope roller at the tail end of the ship structure, and the two groups of branch traction rope bodies are respectively connected with the other ends of the two main traction rope bodies in a one-to-one correspondence manner; the main traction rope body and the branch traction rope body are wound on the rope roller together;

each group of the partial traction rope bodies is divided into two from the other end of the main traction rope body, a rope connecting end is arranged at one end, far away from the main traction rope body, of each partial traction rope body, and a release end of the traction structure is formed through the rope connecting ends; the four rope connecting ends are respectively connected with the inlet part of the fishing structure.

3. The device of claim 2, wherein the towing structure further comprises two water baffles;

the two water baffles are fixedly connected to the two main traction rope bodies in a one-to-one correspondence mode respectively, and the four rope connecting ends are connected with the upper end and the lower end of the left side and the right side of the inlet portion of the fishing structure respectively.

4. The device for preventing the fishing boat trawl net from being extruded in the net applied to the marine fishery engineering according to the claim 2 or 3, wherein the fishing structure comprises a trawl inlet part, a cylindrical trawl body and a tail end mounting plate which are fixedly connected in sequence; the inlet part of the trawl is used as the inlet part of the fishing structure; the tail end mounting plate is used as the tail part of the fishing structure;

the outer edge of one end of the trawl inlet part, which is far away from the cylindrical trawl body, is fixedly connected with an inlet end connecting plate; the four rope connecting ends are respectively fixedly connected with the inlet end connecting plate in a separable manner;

an inlet cavity is formed in the inlet part of the trawl, a trawl inner cavity communicated with the inlet cavity is formed in the cylindrical trawl body, and the inlet cavity and the trawl inner cavity jointly form an accommodating inner cavity of the fishing structure; the inner cavity partition structure is arranged in the inner cavity of the trawl;

the tail end mounting plate is fixedly connected to one end, far away from the inlet part of the trawl, of the cylindrical trawl body, and a plurality of drag reduction through holes communicated with the inner cavity of the trawl and the outer part of the cylindrical trawl body are formed in the tail end mounting plate; the screw driving structure is rotatably mounted on the tail end mounting plate.

5. The device for preventing the fishing boat trawl net from being squeezed in the net applied to the marine fishery engineering according to the claim 4, wherein the longitudinal section of the inner cavity of the trawl net is elliptical;

the inner cavity partition structure is arranged on two sides of the inner cavity of the trawl and divides the two sides of the inner cavity of the trawl into a plurality of partition spaces.

6. The device of claim 4, wherein the inner cavity partition structure comprises a plurality of cambered surface retaining nets;

the cambered surface blocking nets are provided with cambered groove surfaces, and the protruding directions of the cambered groove surfaces face the tail parts of the cylindrical trawl bodies; the cambered surface keeps off even rigid coupling of net in the left and right sides space of trawl net inner chamber, and adjacent two wantonly around the cambered surface keeps off and all leaves between the net and be equipped with access way, forms a subregion space.

7. The device of claim 6, wherein the cambered retaining nets in the left and right spaces of the inner cavity of the trawl are arranged in a staggered manner in sequence, that is, the partitioned spaces in the left and right spaces of the inner cavity of the trawl are arranged in a staggered manner.

8. The device of claim 6, wherein the inner cavity partition structure further comprises a fixing band;

the upper end and the lower end of the cambered surface blocking net and the side end deviating from the center of the cylindrical trawl body are fixedly connected to the inner wall of the cylindrical trawl body through the fixing belt, and the cambered surface blocking net is fixedly connected to the cylindrical trawl body from at least three directions.

9. The device of claim 8, wherein the inner chamber partition structure further comprises a side barrier net;

the side blocking net is fixedly connected to one side end, facing the center of the cylindrical trawl body, of the cambered surface blocking net, and the extending direction of the side blocking net faces the access passage.

10. The device of claim 4, wherein the screw driving rod comprises a driving shaft and a soft screw plate;

the windmill type water wheel is positioned at the rear of the outer side of the tail end mounting plate, and the transmission shaft is positioned in the center of the cylindrical trawl body; the central shaft of the windmill type water wheel is rotatably assembled in the center of the tail end mounting plate, and the central shaft of the windmill type water wheel penetrates through the tail end mounting plate and extends into the cylindrical trawl body; the transmission shaft is fixedly connected with a central shaft of the windmill type water wheel in a transmission way;

the soft spiral plate is spirally extended and fixedly connected to the outer wall of the transmission shaft.

Technical Field

The invention relates to the technical field of ocean engineering equipment, in particular to a trawl net device of a fishing boat capable of preventing extrusion in a net, which is applied to ocean fishery engineering.

Background

With the continuous upgrading of marine fishing technical means, the mechanized trawl fishing boat becomes the most mainstream fishing mode for fishing by the fishing boat going out of the sea. In the prior art, trawl fishing is to drag a fishing net to advance through a fishing boat, the fishing net is collected after fishing objects such as fishes, shrimps and the like in sea enter a bag along with the advancing of a boat body, and compared with the traditional fishing mode, trawl fishing has the advantages of convenience in operation and wide fishing coverage area.

However, the tail end of the trawl can block the catch, and the catch enters the trawl successively along with the advance of the trawl, so that the catch entering the trawl first is easy to be extruded by the catch entering the trawl after entering the trawl, and the catch is extruded to die and deteriorate in the trawl. At present, chinese patent application with patent publication No. CN111820193A discloses a layered bag trawl, which can generate a certain extrusion-proof effect for the harvested fish, but its principle is to utilize the characteristic that shrimps and part of the subsidiary fish swim upwards after being harvested, and enter a connecting net sleeve to seek shelter, so as to play an extrusion-proof effect for the shrimps and part of the subsidiary fish in the connecting net sleeve, but still cannot play an integral extrusion-proof function for various types of the harvested fish in the trawl, and the functional applicability is not high.

Disclosure of Invention

Therefore, the invention provides a trawl device of a fishing boat with internal extrusion prevention applied to marine fishery engineering, which solves the technical problem that trawl fishing operation in the prior art cannot play an integral extrusion prevention function on various kinds of fisheries in the trawl.

In order to achieve the above purpose, the invention provides the following technical scheme:

a net internal anti-extrusion fishing boat trawl device applied to marine fishery engineering is arranged on a hull structure, and a rope roller is rotatably arranged on the hull structure; the trawl apparatus comprises a traction structure, a catching structure, an inner cavity partition structure and a spiral driving structure.

The traction structure is wound on the outer side of the rope roller, a release end is arranged on the outer side of the rope roller, and the extension length between the release end and the hull structure is adjustable through the rope roller.

The inlet part of the catching structure is fixedly connected with the releasing end, and the tail part of the catching structure is positioned at one side of the inlet end of the catching structure, which is far away from the hull structure; and an accommodating inner cavity is arranged between the inlet part and the tail part of the fishing structure.

The inner cavity partition structure is arranged on two sides of the inner part of the accommodating inner cavity, and the inner cavity partition structure can divide the two sides of the inner part of the accommodating inner cavity into a plurality of partition spaces.

The spiral driving structure comprises a windmill type water wheel and a spiral driving rod.

The windmill type water wheel is provided with a central shaft, and the central shaft of the windmill type water wheel is rotatably arranged at the tail part of the fishing structure; the spiral driving rod is in transmission connection with the central shaft and extends to the inner center of the accommodating inner cavity; the windmill type water wheel can rotate under the action of the impulse force of water flow in the front direction, and the spiral driving rod can generate backward spiral water flow around the spiral driving rod when rotating.

Further, the traction structure comprises two main traction rope bodies and two groups of traction rope bodies.

One end of each of the two main traction rope bodies is connected with the rope roller at the tail end of the ship structure, and the two groups of branch traction rope bodies are respectively connected with the other ends of the two main traction rope bodies in a one-to-one correspondence manner; the main traction rope body and the branch traction rope body are wound on the rope roller together.

Each group of the partial traction rope bodies is divided into two from the other end of the main traction rope body, a rope connecting end is arranged at one end, far away from the main traction rope body, of each partial traction rope body, and a release end of the traction structure is formed through the rope connecting ends; the four rope connecting ends are respectively connected with the inlet part of the fishing structure.

Further, the traction structure also comprises two water baffles.

The two water baffles are fixedly connected to the two main traction rope bodies in a one-to-one correspondence mode respectively, and the four rope connecting ends are connected with the upper end and the lower end of the left side and the right side of the inlet portion of the fishing structure respectively.

Furthermore, the fishing structure comprises a trawl inlet part, a cylindrical trawl body and a tail end mounting plate which are fixedly connected in sequence; the inlet part of the trawl is used as the inlet part of the fishing structure; the tail end mounting plate is used as the tail part of the fishing structure.

The outer edge of one end of the trawl inlet part, which is far away from the cylindrical trawl body, is fixedly connected with an inlet end connecting plate; the four rope connecting ends are respectively fixedly connected with the inlet end connecting plates in a separable mode.

An inlet cavity is formed in the inlet part of the trawl, a trawl inner cavity communicated with the inlet cavity is formed in the cylindrical trawl body, and the inlet cavity and the trawl inner cavity jointly form an accommodating inner cavity of the fishing structure; the inner cavity partition structure is arranged in the inner cavity of the trawl.

The tail end mounting plate is fixedly connected to one end, far away from the inlet part of the trawl, of the cylindrical trawl body, and a plurality of drag reduction through holes communicated with the inner cavity of the trawl and the outer part of the cylindrical trawl body are formed in the tail end mounting plate; the screw driving structure is rotatably mounted on the tail end mounting plate.

Furthermore, the longitudinal section of the inner cavity of the trawl is elliptical.

The inner cavity partition structure is arranged on two sides of the inner cavity of the trawl and divides the two sides of the inner cavity of the trawl into a plurality of partition spaces.

Further, the inner cavity partition structure comprises a plurality of cambered surface blocking nets.

The cambered surface blocking nets are provided with cambered groove surfaces, and the protruding directions of the cambered groove surfaces face the tail parts of the cylindrical trawl bodies; the cambered surface keeps off even rigid coupling of net in the left and right sides space of trawl net inner chamber, and adjacent two wantonly around the cambered surface keeps off and all leaves between the net and be equipped with access way, forms a subregion space.

Furthermore, the cambered surface baffle nets positioned in the left and right spaces of the inner cavity of the trawl are sequentially arranged in a staggered manner, namely, the subarea spaces respectively positioned in the left and right sides of the inner cavity of the trawl are arranged in a staggered manner.

Further, the inner cavity partition structure further comprises a fixing band.

The upper end and the lower end of the cambered surface blocking net and the side end deviating from the center of the cylindrical trawl body are fixedly connected to the inner wall of the cylindrical trawl body through the fixing belt, and the cambered surface blocking net is fixedly connected to the cylindrical trawl body from at least three directions.

Further, the lumen partition structure further comprises a side barrier net.

The side blocking net is fixedly connected to one side end, facing the center of the cylindrical trawl body, of the cambered surface blocking net, and the extending direction of the side blocking net faces the access passage.

Further, the spiral driving rod comprises a transmission shaft and a soft spiral plate.

The windmill type water wheel is positioned at the rear of the outer side of the tail end mounting plate, and the transmission shaft is positioned in the center of the cylindrical trawl body; the central shaft of the windmill type water wheel is rotatably assembled in the center of the tail end mounting plate, and the central shaft of the windmill type water wheel penetrates through the tail end mounting plate and extends into the cylindrical trawl body; the transmission shaft is fixedly connected with a central shaft of the windmill type water wheel in a transmission way.

The soft spiral plate is spirally extended and fixedly connected to the outer wall of the transmission shaft.

The invention has the following beneficial effects:

the device can be used for driving and connecting the hull structure and the catching structure through the traction structure, so that the catching structure can synchronously move forward along with the hull structure under water to finish catching; in the fishing process, the spiral driving structure can synchronously move forward along with the fishing structure, and the spiral driving structure can automatically generate rotation kinetic energy under the action of water when moving forward and transmit the rotation kinetic energy to the water in the fishing structure, so that the water flows backwards by stirring the spiral; the water flow of the catch entering the catching structure flowing backwards along with the spiral is gradually shunted to a plurality of different positions formed inside the catching structure separated by the inner cavity partition structure, so that the dispersion degree of the catch in the catching structure is improved, the possibility of extrusion and deterioration caused by the catch concentrating to the rear part of the catching structure is effectively reduced, the survival rate of the catch is improved, and the trawl catching quality is improved.

Drawings

In order to clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly introduced, and the structures, the proportions, the sizes, and the like shown in the specification are only used for matching with the contents disclosed in the specification, so that those skilled in the art can understand and read the modifications of any structures, the changes of the proportion relationships, or the adjustments of the sizes, without affecting the functions and the achievable purposes of the present invention, and still fall within the scope of the technical contents disclosed in the present invention.

Fig. 1 is one of the overall structural schematic diagrams of the internal anti-extrusion fishing boat trawl apparatus applied to the marine fishery engineering provided by the embodiment of the invention.

Fig. 2 is a second schematic view of the overall structure of the internal anti-extrusion fishing boat trawl apparatus applied to the marine fishery engineering according to the embodiment of the present invention.

Fig. 3 is a schematic perspective view of a fishing structure, an inner cavity partition structure and a spiral driving structure in the in-net anti-extrusion fishing boat trawl apparatus applied to marine fishery engineering provided by the embodiment of the invention.

Fig. 4 is a schematic top view structural diagram of a fishing structure, an inner cavity partition structure and a spiral driving structure in the trawl apparatus of the in-net anti-extrusion fishing boat applied to the marine fishery engineering provided by the embodiment of the invention.

FIG. 5 is a schematic view of the working states of a fishing structure, an inner cavity partition structure and a spiral driving structure in the in-net anti-extrusion fishing boat trawl apparatus applied to the marine fishery engineering provided by the embodiment of the invention.

In the drawings, the components represented by the respective reference numerals are listed below:

a hull structure 1;

the traction structure 2: the main traction rope body 21, the water baffle 22, the branch traction rope body 23 and the rope connecting end 24;

fishing structure 3: the trawl inlet 31, the inlet connecting plate 311, the inlet cavity 312, the cylindrical trawl body 32, the trawl cavity 321, the tail end mounting plate 33 and the drag reduction through hole 331;

inner cavity partition structure 4: cambered surface blocking net 41, fixing belt 42 and side blocking net 43;

a screw driving structure 5; windmill type waterwheel 51, transmission shaft 52, soft spiral plate 53.

Detailed Description

The present invention is described in terms of particular embodiments, other advantages and features of the invention will become apparent to those skilled in the art from the following disclosure, and it is to be understood that the described embodiments are merely exemplary of the invention and that it is not intended to limit the invention to the particular embodiments disclosed. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the present specification, the terms "upper", "lower", "left", "right" and "middle" are used for clarity of description only, and are not used to limit the scope of the present invention, and the relative relationship between the terms and the relative positions may be changed or adjusted without substantial technical change.

The embodiment of the invention provides a trawl device of a fishing boat for preventing extrusion in a net, which is applied to marine fishery engineering and is shown in figures 1-5, and the trawl device comprises a traction structure 2, a fishing structure 3, an inner cavity partition structure 4 and a spiral driving structure 5, wherein the traction structure 2 is connected with a hull structure 1; the fishing device is used for driving and connecting the hull structure 1 and the fishing structure 3 through the traction structure 2, so that the fishing structure 3 can synchronously move forward along with the hull structure 1 under water to finish fishing; and in the fishing process, the spiral driving structure 5 can synchronously advance along with the fishing structure 3, the spiral driving structure 5 can automatically generate rotary kinetic energy under the action of water when advancing, and the rotary kinetic energy is transmitted to the water in the fishing structure 3, so that the water flows backwards by stirring the spiral, the fishing objects entering the fishing structure 3 are gradually shunted to a plurality of different positions formed by separating the fishing structure 3 by the inner cavity partition structure 4 along with the water flow flowing backwards, the dispersion degree of the fishing objects in the fishing structure 3 is improved, the possibility that the fishing objects are concentrated to the rear part of the fishing structure 3 to cause extrusion and deterioration is effectively reduced, the survival rate of the fishing objects is improved, and the trawl fishing quality is improved. The specific settings are as follows:

as shown in fig. 1 to 2, the traction structure 2 comprises two main traction rope bodies 21, two water baffles 22, two groups of traction rope bodies 23 and a rope connecting end 24; one end of each of the two main traction rope bodies 21 is connected with a rope roller arranged at the tail part of the ship body structure 1; the two groups of partial traction rope bodies 23 are respectively connected with the other ends of the two main traction rope bodies 21 in a one-to-one correspondence manner, the number of the partial traction rope bodies 23 in each group is two from the other end of the main traction rope body 21, and the main traction rope body 21 and the partial traction rope bodies 23 are wound on the rope rollers together; each branch traction rope body 23 is provided with a rope connecting end 24 at one end far away from the main traction rope body 21, and the four rope connecting ends 24 are respectively connected with the upper end and the lower end of the left side and the right side of the inlet part of the catching structure 3 and are used for driving the catching structure 3 to synchronously advance along with the ship body structure 1 through the matching of the main traction rope body 21 and the branch traction rope bodies 23 so as to complete the set catching function.

The two water baffles 22 are respectively fixedly connected to the two main traction rope bodies 21 in a one-to-one correspondence manner, and are used for generating wake flow by sailing the hull structure 1 to push the two water baffles 22 to keep outward expansion when the hull structure 1 drags the fishing structure 3 to synchronously advance through the two water baffles 22, so as to drive the two main traction rope bodies 21 and the two groups of traction rope bodies 23 to outwards expand, and further to ensure that the inlet part of the fishing structure 3 keeps open.

As shown in fig. 2 to 5, the catching structure 3 comprises a trawl inlet 31, a cylindrical trawl body 32 and a tail end mounting plate 33 which are connected in sequence; the outer edge of one end of the trawl inlet 31 far away from the cylindrical trawl body 32 is fixedly connected with an inlet end connecting plate 311; the four rope connecting ends 24 are fixedly connected with the upper ends and the lower ends of the left side and the right side of the inlet end connecting plate 311 in a one-to-one correspondence separable manner; the trawl inlet 31 has an inlet chamber 312 inside; the opening area of the inlet cavity 312 corresponding to one end of the inlet end connecting plate 311 is larger than the opening area of the inlet cavity 312 corresponding to one end of the cylindrical trawl body 32, so that fishes and shrimps can be trapped in the inlet cavity 312 of the trawl inlet 31 in a wider range and further fall into the cylindrical trawl body 32 through the inlet cavity 312.

A trawl cavity 321 communicated with the inlet cavity 312 is arranged in the cylindrical trawl body 32, and the vertical section of the trawl cavity 321 is elliptical so as to enable the space on the left side and the space on the right side in the trawl cavity 321 to be relatively larger; the inner cavity partition structure 4 is arranged inside the trawl inner cavity 321, and is used for partitioning the space on the left side and the right side of the trawl inner cavity 321 into a plurality of partition spaces through the inner cavity partition structure 4.

Tail end mounting panel 33 rigid coupling in the tube-shape is dragged the dictyosome 32 and is kept away from the one end that the trawl enters the portion 31, just a plurality of intercommunication has evenly been seted up to tail end mounting panel 33 trawl inner chamber 321 with the outside drag reduction through-hole 331 of tube-shape trawl body 32, 5 fixed mounting in screw drive structure 33 for form the rear portion dictyosome structure of tube-shape trawl body 32 through tail end mounting panel 33, still can make the rivers effectively pass through in order to reduce the resistance of marcing when can sealing the fishery harvesting thing export, and still can stabilize installation screw drive structure 5 through tail end mounting panel 33, make screw drive structure 5 can keep corresponding with the tube-shape trawl body 32 middle part of the in-process that advances.

Specifically, with continued reference to fig. 3 to 5, the lumen partition structure 4 includes an arc blocking net 41, a fixing band 42 and a side blocking net 43; the number of the arc-shaped blocking nets 41 is multiple, each arc-shaped blocking net 41 is provided with an arc-shaped groove surface, the protruding direction of each arc-shaped groove surface faces the tail end of the cylindrical trawl body 32, and the arc-shaped groove surfaces of the arc-shaped blocking nets 41 are used for assisting in catching the fishery catch objects in the advancing process; the plurality of cambered surface blocking nets 41 are uniformly and fixedly connected to the left and right side spaces of the trawl cavity 321, and an access passage is reserved between any two cambered surface blocking nets 41 adjacent to each other in the front and back direction to form a partition space; the cambered surface baffle nets 41 positioned in the left and right side spaces of the trawl cavity 321 are sequentially arranged in a staggered manner, that is, the partition spaces positioned in the left and right sides of the trawl cavity 321 are arranged in a staggered manner, so that the spiral water flow direction generated by the spiral driving structure 5 can be more effectively adapted through the plurality of partition spaces arranged in a staggered manner left and right, and the fishery catch can be gradually shunted to the inner parts of the cambered surface baffle nets 41 from front to back.

The upper end and the lower end of the arc-shaped blocking net 41 and the side end thereof departing from the center of the cylindrical trawl body 32 are fixedly connected to the net wall of the cylindrical trawl body 32 through the fixing belt 42, so that the arc-shaped blocking net 41 can be stably and fixedly connected to the cylindrical trawl body 32 from three directions; the side blocking net 43 is fixedly connected to one side end, facing the center of the cylindrical trawl body 32, of the arc blocking net 41, the actual height, facing the access passage, of the side blocking net 43 can be independently set according to actual working requirements, so that the side blocking net 43 is used for blocking the catch entering the arc blocking net 41, and the possibility that the catch flows back to the center of the cylindrical trawl body 32 again and continues to flow backwards is reduced.

The screw driving structure 5 comprises a windmill-type water wheel 51, a transmission shaft 52 and a soft screw plate 53; wherein the windmill type water wheel 51 is positioned at the rear of the outer side of the tail end mounting plate 33, and the transmission shaft 52 is positioned at the center of the inner part of the cylindrical trawl body 32; the central shaft of the windmill type water wheel 51 is rotatably assembled in the center of the tail end mounting plate 33 through a bearing, and the central shaft of the windmill type water wheel 51 penetrates through the tail end mounting plate 33 and extends into the cylindrical trawl body 32; the transmission shaft 52 is fixedly connected with the central shaft of the windmill-type water wheel 51 in a transmission way through a flange; the soft spiral plate 53 extends spirally and is fixedly connected to the outer wall of the transmission shaft 52, and the material of the soft spiral plate 53 can be, but is not limited to, rubber and soft PVC; when the fishing structure 3 drives the spiral driving structure 5 to advance synchronously, the windmill type water wheel 51 in the spiral driving structure 5 generates interaction force with water when advancing, so that the windmill type water wheel 51 is stressed to rotate, and further, the transmission shaft 52 connected with the center shaft of the windmill type water wheel 51 is synchronously rotated, the transmission shaft 52 drives the soft spiral plate 53 to rotate to generate spiral backward water flow at the center of the trawl inner cavity 321, and after a fishery product enters the trawl inner cavity 321, the fishery product is gradually shunted to the front side of the cambered surface blocking net 41 in the inner cavity partition structure 4 at two sides of the trawl inner cavity 321 under the action of the spiral backward water flow and centrifugal force.

The use method of the in-net anti-extrusion fishing boat trawl device applied to the marine fishery engineering in the embodiment specifically comprises the following steps:

first, preparation work before trawl fishing is performed.

The specific process is as follows: respectively checking whether a trawl inlet 31 and a cylindrical trawl body 32 in the fishing structure 3 are damaged or not and the connection sealing performance of a tail end mounting plate 33 to the cylindrical trawl body 32; and simultaneously, the firm installation stability between the inner cavity partition structure 4 and the spiral driving structure 5 and the fishing structure 3 is checked.

Secondly, the fishing structure 3 with the inner cavity partition structure 4 and the spiral driving structure 5 are thrown into seawater at the tail end of the ship body structure 1 together, and the traction structure 2 is gradually released by means of rope rollers of the ship body structure 1 so as to complete synchronous forward transmission traction between the ship body structure 1 and the fishing structure 3 through the traction structure 2.

The specific process is as follows: keeping the ship body structure 1 running and releasing the locking of the traction structure 2 on the rope roller of the ship body structure 1; the fishing structure 3 with the inner cavity partition structure 4 and the spiral driving structure 5 are thrown into seawater at the tail part of the hull structure 1 together, the hull structure 1 continues to drive the rope rollers of the traction structure 2 to advance, the fishing structure 3 and the associated structure thereof stop advancing under the action of water resistance, and simultaneously the traction structure 2 is pulled to automatically rotate and release on the rope rollers until the main traction rope body 21 and the branch traction rope bodies 23 in the traction structure 2 are completely extended.

In the process that the main traction rope body 21 and the branch traction rope body 23 are completely extended to effectively transfer traction force, two water baffles 22 in the traction structure 2 are gradually separated towards two sides under the action of dispersed wake generated by advancing of the hull structure 1, the two water baffles 22 respectively drive the corresponding main traction rope body 21 and the branch traction rope body 23 to be separated towards two sides, the main traction rope body 21 and the branch traction rope body 23 are ensured not to block the trawl entrance 31 of the fishing structure 3 in the advancing process, and the trawl entrance 31 is kept open.

And thirdly, the hull structure 1 pulls the fishing structure 3 to advance synchronously through the pulling structure 2, so that the spiral driving structure 5 at the tail end of the fishing structure 3 expands the whole fishing structure 3 forwards and backwards under the action of water resistance, and the inner cavity partition structure 4 in the fishing structure 3 expands to form a plurality of partition spaces.

The specific process is as follows: the ship body structure 1 keeps sailing in, and orderly draws the trawl inlet part 31 in the catching structure 3 through the main drawing rope body 21 and the sub-drawing rope body 23 to keep synchronously advancing, the windmill type water wheel 51 in the spiral driving structure 5 is driven by water resistance to drive the tail end mounting plate 33 in the catching structure 3 to stay at the original position, so that the cylindrical trawl body 32 between the trawl inlet part 31 and the tail end mounting plate 33 is completely unfolded along the front-back direction, and under the combined action of the unfolded cylindrical trawl body 32, the tail end mounting plate 33 and the spiral driving structure 5 integrally follow the trawl inlet part 31 to synchronously advance.

The inner cavity partition structure 4 positioned in the cylindrical trawl body 32 is synchronously unfolded along with the cylindrical trawl body 32; the left and right sides of the trawl cavity 321 inside the cylindrical trawl body 32 are separated into a plurality of subarea spaces for dispersing the catch through a plurality of cambered surface baffle nets 41 in the cavity subarea structure 4.

Further, as the fishing structure 3 advances to catch the fish, the screw driving structure 5 advances synchronously with the fishing structure 3 and continues to act on the inner center of the fishing structure 3 based on the water resistance to form a water flow spirally backward.

The specific process is as follows: when the trawl entrance 31 of the fishing structure 3 travels, the fishes and shrimps on the traveling path are caught in the inlet chamber 312 of the trawl entrance 31 and further flow into the trawl cavity 321 inside the cylindrical trawl body 32 at the rear of the trawl entrance 31 through the inlet chamber 312.

Meanwhile, the trawl inlet 31 advances to drive the windmill type water wheel 51 in the spiral driving structure 5 to advance synchronously, at the moment, the interaction force generated between the windmill type water wheel 51 and water in the advancing process enables the windmill type water wheel 51 to rotate under stress, the transmission shaft 52 assembled and connected with the central shaft of the windmill type water wheel 51 rotates synchronously, the transmission shaft 52 drives the soft spiral plate 53 to rotate, and the rotation of the soft spiral plate 53 generates backward spiral water flow at the center of the trawl inner cavity 321.

Then, the catch inside the catching structure 3 flows spirally through the backward spiral water flow and then is gradually shunted backwards to the inner cavity partition structure 4 at the inner side of the catching structure 3 under the action of centrifugal force.

The specific process is as follows: after entering the trawl cavity 321, the catch falls into the arc blocking net 41 located at the front side of the trawl cavity 321, and after the front arc blocking net 41 reaches a predetermined capacity, the catch close to the center of the trawl cavity 321 rotates backwards gradually under the action of the spiral backward water flow, and is divided into the arc blocking nets 41 at the two subsequent sides of the trawl cavity 321 gradually under the action of the centrifugal force generated by the rotation.

And finally, the hull structure 1 continues to keep advancing, the traction structure 2 is gradually wound through a rope roller of the hull structure 1, the catching structure 3, the inner cavity partition structure 4 and the spiral driving structure 5 are together recovered to the hull structure 1 under the driving of the traction structure 2, and the following sorting work is carried out on the harvested objects.

The specific process is as follows: the boat body structure 1 continues to keep the original speed or advance at a reduced speed, the main traction rope body 21 and the branch traction rope bodies 23 are gradually and sequentially wound by manually or electrically controlling the rope rollers, after the winding is finished, the trawl inlet 31 is wound into the boat body structure 1 along with the branch traction rope bodies 23, the cylindrical trawl body 32, the tail end mounting plate 33 connected with the cylindrical trawl body 32, the spiral driving structure 5 fixedly connected to the tail end mounting plate 33 and the inner cavity partition structure 4 in the cylindrical trawl body 32 are together wound into the boat body structure 1 along with the trawl inlet 31, and after the rope rollers are locked again, the fishing objects in each partition space in the cylindrical trawl body 32 are subjected to subsequent sorting and boxing operation.

Therefore, the use method of the in-net anti-extrusion fishing boat trawl device applied to the marine fishery engineering is completed.

Although the invention has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.