NL2031378B1 - Mounting structure for net cover for fish suction raft of aquaculture vessel - Google Patents

Abstract

Provided, is a mounting structure for a net cover for a fish suction raft of an aquaculture vessel. A fish raft has an inner channel, and clamping columns and limiting stop blocks are arranged on the inner channel; clamping strips are mounted on the net cover, net cover clamping openings are aligned with the clamping columns, then the net cover is inserted into the inner channel and then rotated, rotating handles are rotated and fixed on fixing bolts by means of screws, and then the clamping strips are tightly attached to the clamping columns; and conversely, when the net cover is to be dismounted from the fish raft, the screws are loosened, the rotating handles are rotated, and then the net cover is rotated, so as to be dragged out of the inner channel; and the net cover is made of an organic material having low density.

Description

MOUNTING STRUCTURE FOR NET COVER FOR FISH SUCTION RAFT OF AQUACULTURE VESSEL

TECHNICAL FIELD The present invention relates to a mounting structure for a net cover for a fish suction raft of an aquaculture vessel, and belongs to the technical field of culture cabins of aquaculture vessels.

BACKGROUND ART Large net cages have the congenital defects. For example, most of net cages which have been built and are being built pres- ently have no power and can only be moored in a fixed position in a certain sea area, resulting in limitation of the species of cul- tured fishes; moreover, the cultured fishes are in a certain posi- tion all the year round, and thus, the growth speed of fishes is easily restricted with the change of season; and the net cages are basically cultured in the open sea area, and if the local sea area is polluted, the cultured fishes in the net cages will be polluted and cause diseases. Therefore, the large aquaculture vessel will become an im- portant culture tool for deep and open sea culture. The main rea- sons are as follows: 1, the large aquaculture vessel has own pow- er, which can cruise to the environment most suitable for fish growth; and 2, culture cabins of the large aquaculture vessel are independent of each other, and seawater circulation of the culture cabin is to pump the seawater around the aquaculture vessel by means of the pump, each cabin is provided with an independent wa- ter quality detection system, the water quality detection system is mounted around the boat, when it is detected that the water quality around the aquaculture vessel does not meet the (polluted) culture requirements, the seawater external circulation system of the aquaculture vessel shall be closed immediately, internal cir- culation of the culture cabin shall be opened at the same time, and the culture boat shall sail to the sea area with excellent wa-

ter quality immediately for culture.

A fish raft net cover device is used as a device mounted at the bottom of the culture cabin of the large aquaculture vessel, ballast water of the culture cabin, side overflow and forced dis- charge of culture water, dirt discharge and adult fish fishing need to be completed directly or indirectly through a fish raft net cover and a cover plate. Whether the design of the fish raft net cover device is reasonable directly affects the growth speed and health of fishes in the culture cabin, the water quality of culture water, whether the dirty dirt in the culture cabin can be smoothly and timely discharged out of the cabin, and whether the fishes can be caught extremely smoothly and quickly, which has a vital effect.

The net cover mounted above the inner channel of the fish raft of the culture cabin can only be dismounted manually when adult fishes are to be caught. The existing net cover for a fish suction raft is generally made of stainless steel and is fixed to the fish suction raft by means of bolts, and therefore, it is dif- ficult for a diver to dive into the bilge to dismount the fish suction raft; it is extremely laborious to drag the fish suction raft away from the water line of the culture cabin after dismount- ing; and moreover, it is extremely easy for the inner and outer walls of the stainless steel net cover to grow marine organisms such as algae and shellfish, which is not only troublesome to clean, but also weakens or even loses the functions of the net cover since the net cover is a channel for dirt discharge of the culture cabin, forced discharge and overflow of culture water on the side, if marine organisms grow too much on the net cover, the holes on the net cover will be blocked, and even shellfish will grow directly on the holes to block the holes. The use of the net cover in the present invention can solve the problems of difficult dismounting, laborious dragging away from the water surface of the culture cabin and easiness to grow marine organisms. The structure of the device cannot grow marine organisms easily, and will remain unblocked for a long time for the functions of the net cover in dirt discharge of the culture cabin, and forced discharge and side discharge of culture water.

SUMMARY The objective of the present invention is to provide a mount- ing structure for a net cover for a fish suction raft of an aqua- culture vessel, which solves the problems that when a diver dives into a cabin bottom, mounting and dismounting difficulty is large, and after being mounted, the net cover is dragged away from a wa- ter surface of a culture cabin, aquatic organisms of seaweed, shellfish, etc. are easily attached to the net cover in an oxygen- enriched environment, etc.

The present invention uses the following technical solution: the mounting structure for a net cover for a fish suction raft of an aguaculture vessel includes a net cover 1 and a fish raft 2, where a middle of the fish raft 2 is provided with an in- ner channel, and a plurality of clamping columns 201 and a plural- ity of limiting stop blocks are arranged on an inner wall of the inner channel at intervals; an outer diameter of the net cover 1 matches an inner diameter of the inner channel, and amplitude of inserting the net cover 1 into the inner channel is limited by the limiting stop blocks 202 and clamping strips 104; when the net cover 1 is to be mounted on the fish raft 2, net cover clamping openings 107 are aligned with the clamping columns 201 on the in- ner wall of the inner channel of the fish draft, the net cover 1 is inserted into the inner channel of the fish raft by a set depth and then is rotated anticlockwise in place, then the rotating han- dles on an outer wall of the net cover 1 are rotated clockwise by 90°, the rotating handles 103 are fixed on fixing bolts 106 by means of screws, and then clamping strips 104, connected to the rotating handles 103 together, on the inner wall of the net cover 1 are tightly attached to the clamping columns 201, such that the net cover 1 is mounted on the fish raft 2; conversely, when the net cover 1 is to be dismounted from the fish raft 2, the screws fixed on the fixing bolts 106 are firstly loosened, the rotating handles 103 are rotated anticlockwise by 90°, and then the net cover 1 is rotated clockwise, such that the net cover 1 is dragged out of the inner channel of the fish raft 2; and the net cover 1 is made of an organic material having density lower than that of water.

Preferably, the plurality of rotating handles 103 for rotat- ing the net cover 1 are vertically arranged on a side wall of the net cover 1.

Preferably, a hanging ring 105 is arranged at a top of the net cover 1, and the hanging ring 105 is pulled by a rope.

Preferably, the hanging ring 105 and the rotating handles 103 are fixed to the net cover 1 body by means of the fixing bolts

106.

Preferably, the organic material is polypropylene having ma- terial density of 0.87 kg/dm’.

Preferably, the net cover 1 has weight of 25 kilograms, and overall density of 0.95 kg/dm’, and may automatically float on a surface of culture water of a culture cabin after being dismount- ed.

Preferably, the handle bars 102 are further arranged on the net cover 1, and the handle bars 102 are located above the rotat- ing handles 103.

The present invention has the beneficial effects: 1) when the diver dives into the cabin bottom, the net cover may be easily separated from the fish daft by rotating the net cover, such that operation is simple and convenient; 2) the net cover has the density lower than that of water, and the net cover may automatically rise to a water surface along with buoyancy after being separated from the fish raft, such that time and labor are saved; 3) the net cover is made of the organic material, thereby greatly reducing the problem that seaweed and shellfish marine or- ganisms are attached; 4) the net cover is provided with the handle bars, such that the net cover is convenient to rotate, and moreover, the clamping strips matching the clamping columns on the fish raft are ar- ranged, and are used for locking the net cover to be separated from the fish raft, such that design is reasonable, simple and re- liable; and 5) the hanging ring is arranged above the net cover and may be connected to the rope, thereby further reducing net cover recy-

cle difficulty, and relieving labor intensity.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a vertical cutaway view of a mounting structure for 5 a net cover for a fish suction raft of an aquaculture vessel.

FIG. 2 is a sectional schematic diagram of a net cover.

FIG. 3 is a schematic diagram of a fish raft.

FIG. 4 is a schematic diagram of the net cover and the fish raft arranged at a bottom of a culture cabin. Under normal culture conditions, a seawater circulating pump injects water into the culture cabin all the time, and the net cover, the fish raft and an overflow pipeline form the effect of a communicating vessel to- gether, such that the water in the culture cabin is kept at a cer- tain height all the time.

In the figures, 1. net cover, 2. fish raft, 101. net cover body, 102. handle bar, 103. rotating handle, 104. clamping strip,

105. hanging ring, 106. fixing bolt, 107. clamping opening, 201. clamping column, and 202. limiting stop block.

DETAILED DESCRIPTION OF THE EMBODIMENTS The present invention will be further described below with reference to the accompanying drawings and the particular embodi- ments.

With reference to FIGs. 1-4, a mounting structure for a net cover for a fish suction raft of an aquaculture vessel includes a net cover 1 and a fish raft 2, where a middle of the fish raft 2 is provided with an inner channel, and a plurality of clamping columns 201 and a plurality of limiting stop blocks 202 are ar- ranged on an inner wall of the inner channel at intervals; an out- er diameter of the net cover 1 matches an inner diameter of the inner channel, and amplitude of inserting the net cover 1 into the inner channel is limited by the limiting stop blocks 202 and the clamping columns 201; when the net cover 1 is to be mounted on the fish raft 2, net cover clamping openings 107 are aligned with the clamping columns 201 on the inner wall of the inner channel of the fish draft, the net cover 1 is inserted into the inner channel of the fish raft by a set depth and then is rotated anticlockwise in place, then the rotating handles on an outer wall of the net cover 1 are rotated clockwise by 90°, the rotating handles 103 are fixed on fixing bolts 106 by means of screws, and then clamping strips 104, connected to the rotating handles 103 together, on the inner wall of the net cover 1 are tightly attached to the clamping col- umns 201, and the net cover 1 is mounted on the fish raft 2; and conversely, when the net cover 1 is to be dismounted from the fish raft 2, the screws fixed on the fixing bolts 106 are firstly loos- ened, the rotating handles 103 are rotated anticlockwise by 90°, and then the net cover 1 is rotated clockwise, such that the net cover 1 is dragged out of the inner channel of the fish raft 2. The net cover 1 is made of an organic material having density low- er than that of water.

In this embodiment, with reference to FIG. 2, a plurality of handle bars 102 for rotating the net cover 1 are vertically ar- ranged on a side wall of the net cover 1; and a mechanism formed by the rotating handles 103, the clamping strips 104 and the fix- ing bolts 106 are mounted on the net cover, and the mechanism pre- vents the net cover from rotating on the fish raft to be separated from the fish raft during normal culture.

In this embodiment, with reference to FIG. 2, a hanging ring 105 is arranged at a top of the net cover 1, and the hanging ring 105 is pulled by a rope.

In this embodiment, with reference to FIG. 2, the hanging ring 105 and the rotating handles 103 are fixed to a net cover 1 body by means of the fixing bolts 106. In this embodiment, the organic material is polypropylene having material density of 0.87 kg/dm’. In this embodiment, the net cover 1 has weight of 25 kilo- grams, and overall density of 0.95 kg/dm’, and may automatically float on a surface of culture water of a culture cabin after being dismounted.

In this embodiment, with reference to FIG. 2, the handle bars 102 are further arranged on the net cover 1, and the handle bars 102 are located above the rotating handles 103. This embodiment is further described in detail below: the net cover body 101, the handle bars 102, the rotating handles 103, the clamping strips 104, the hanging ring 105, the fixing bolts 106, etc. are assembled together to form the net cov- er 1, which is as shown in FIG. 2. When the culture cabin is in a normal culture state, the net cover 1 is screwed on eight %20 mm x 50 mm clamping columns 201 on an inner ring of the fish raft 2, culture water flow in all the culture cabins is in an anticlockwise rotational flow state, and is right opposite a horizontal opening direction of clamping open- ings 107 on the net cover, and therefore, the net cover 1 is im- pacted by water flow to be in a screwed state, which is as shown in a cutaway schematic diagram of the net cover of FIG. 2.

In addition, in order to ensure that the net cover is com- pletely fixed when being rotatably mounted on a fish raft struc- ture, the rotating handles 103 and the clamping strips 104 are mounted on the net cover 1 body, so as to prevent huge economic losses caused by overflow or forced discharge escape of fishes in the culture cabin along with a side when the net cover 1 is loos- ened to be separated from the fish raft structure.

Material selection and construction of the net cover 1 body are described as follows: the net cover 1 body is made of polypropylene having material density of 0.87 kg/dm’, and the material has high strength and ex- tremely high flexibility, and is non-toxic and free of harm to fishes. The net cover body made of the material is mounted on the fish raft of the culture cabin, such that the fishes in the cul- ture cabin are prevented from escaping from the culture cabin along with overflow, dirt discharge and forced discharge culture water due to damage. In addition, the density of the material is less than that of seawater, when adult fishes are caught, the net cover automatically and slowly floats on the water surface of the culture water after being dismounted from the fish raft, and an operator on a walking board only needs to slightly pull the rope tied on the hanging ring 105 of the net cover and then pull the rope up and tie the rope on a handrail on an edge of the walking board. According to a function requirement of the net cover, the net cover 1 body is fully provided with $25 holes orderly arranged (except some mounting process holes: except mounting process holes having clamping openings with long holes of 22 mm; and a handle bar mounting hole is &13 mm, and pile holes for mounting the ro- tating handles, a rotating handle fixing bolt and a hanging ring fixing bolt are all 21 mm), overflow, forced discharge and dirt discharge of the culture water in the culture cabin may be com- pleted through the %25 holes orderly arranged on the net cover body; and in addition, due to presence of a large number of holes on the net cover, the weight of the net cover is greatly reduced, and dragging is more labor-saving during mounting and dismounting.

Construction of the handle bars 102 is described as follows: the handle bars 102 are made of $12 316L round steel to be U- shaped, and M12 threads are tapped at two ends of a U shape, and have lengths of 50 mm.

Construction of the rotating handles 103 is described as fol- lows: the rotating handles 103 are formed by welding 316L stainless steel plates having a thickness of 10 mm and $20 mm 316L round steel, one ends of the $20 mm round steel are welded to the rotat- ing handles, M16 threads are tapped from ends of the other ends of the %20 round steel, and have lengths of 32 mm, and then square steel having an area of 16 mm x 16 mm is machined, and has a length of 8 mm.

Construction of the clamping strips 104 is described as fol- lows: the clamping strips 104 are made of 316L stainless steel plates having thicknesses of 10 mm, and clamping strip connecting holes are square holes having areas of 16.2 mm x 16.2 mm.

The hanging ring 105 is a standard hanging ring made of 316L.

The fixing bolts 106 are M20 x 50 mm standard bolts made of 316L, centers of nuts are punched and tapped with M10 screws, hole depths are 25 mm, and tapping depths are 20 mm.

The material of the net cover is selected as follows: the net cover is made of polypropylene having density of 0.87 kg/dm®, and all members of the hanging ring, the handle bars, the rotating handles and the clamping strips on the net cover are all made of 316L.

A mounting manner of the net cover is as follows:

eight L-shaped openings provided on the net cover body are clamping openings of 22 mm, the openings are downward, a vertical upward opening distance of the opening of each clamping opening is 70 mm, and then the openings are rotated clockwise, and have lengths of 80 mm.

During mounting, an operator grabs the handle bars on the net cover by hands, the eight clamping openings on the net cover are aligned with the eight $20 stainless steel clamping columns (the clamping columns are welded to an inner ring wall of the fish raft) on the fish raft, then the net cover is pressed downwards by 70 mm, and after a lower edge of the net cover body fully matches the limiting stop blocks (eight pieces are welded on the inner ring wall of the fish raft) on the inner ring wall of the fish raft, the net cover body is rotated anticlockwise by 80 mm.

Then the four rotating handles (each net cover is provided with four sets of rotating handles and clamping strips) are se- gquentially rotated, such that the holes on the rotating handles are aligned to M10 threaded holes on the fixing bolts, M10 inner hexagon screws are fixed on the fixing bolts through an inner hex- agon wrench, and in such a case, the net cover is mounted on the fish raft.

The net cover for the fish raft is dismounted and put away when adult fishes are caught: when cultured fishes in the culture cabin may be caught, be- fore a net driving system is mounted, one end of a flexible rope which is about 20 meters long and is about $8 mm long is fixed on a handrail of the walking board of the culture cabin, and the div- er dives into the net cover for the fish raft of the culture cabin to tie the other end of the flexible rope to the M10 hanging ring of the net cover.

Then, the M10 inner hexagon screws on the fixing bolts are sequentially dismounted through the inner hexagon wrench (the M10 inner hexagon screws need to be repeatedly used and may not be freely discarded in the culture cabin, so as to prevent the situation that after the bolts are discarded in the culture cabin, the bolts are sucked into a catching system in a catching process to damage a fish catching device, or a seawater circulating pump is damaged during culture water circulation in a culture process, etc.); and the net cover is rotated clockwise by 80 mm (or rotated away in a direction opposite rotational flow of the culture circu- lating water until the net cover may not rotate), then the net cover is pulled upwards out of the fish raft (since the gravity of the net cover is less than buoyancy, the net cover automatically and slowly floats to the water surface when the net cover is ro- tated to a position in which the $20 stainless steel clamping col- umns and the net cover clamping openings are perpendicular to the clamping openings), and when the net cover floats on the water surface of the culture water in the culture cabin, a worker on the walking board pulls the rope to pull the net cover away from the water surface by a certain height, so as to tie the rope to the handrail.

When the net cover is mounted, only the clamping opening is aligned with a bayonet pin on the fish raft, the net cover is pressed to enter the fish raft by 70 mm, then the net cover is moved on the handle bar to rotate by 80 mm, and then the four ro- tating handles are sequentially fixed on the fixing bolts through M10 x 20 inner hexagons (a step of dismounting the net cover is opposite a step of mounting the net cover).

Compared with a net cover made of materials of steel, etc., it is not more easier to grow marine organisms on an inner wall and an outer wall of the net cover made of polypropylene in an ox- ygen-enriched culture environment state, and the net cover is more beneficial to pressurized water carrying, discharge of dirt at a bottom of the culture cabin, forced discharge and side overflow in the culture cabin to fully exert performance of the net cover.

What is described above is a preferred embodiment of the pre- sent invention, and a person of ordinary skill in the art may fur- ther make various changes or modifications on this basis, which all should fall within the scope of protection of the present in- vention without departing from the general concept of the present invention.

Claims (7)

CONCLUSIONS A net cover mounting structure for a fish suction raft of an aquaculture vessel, comprising a net cover (1) and a fish raft (2), wherein: a center of the fish raft (2) is provided with an inner channel, and a plurality of clamping columns (201) and a plurality of boundary stop blocks (202) are intermittently disposed on an inner wall of the inner channel; an outer diameter of the net cover (1) matches an inner diameter of the inner channel, and the amplitude of insertion of the net cover (1) into the inner channel is limited by the plurality of clamping posts and the plurality of limiting plugs; a plurality of clamping strips (104) on an inner wall of the net cover (1) stand one-to-one in correspondence with rotating handles (103) on an outer wall of the net cover (1); when the net cover (1) is to be mounted on the fish raft (2), the clamp holes (107) of the net cover are aligned with the clamp posts (201) on the inner wall of the inner channel of the fish raft, with the net cover (1) is inserted into the inner channel of the fishing raft at a set depth and then rotated into place counterclockwise, turning the rotating handles on an outer wall of the net cover (1) 90° turned clockwise, the rotating handles (103) are screwed onto mounting bolts (106) and then clamping strips (104), which are connected to each other with the rotating handles (103), are screwed onto the inner wall of the net cover (1) are firmly attached to the clamping posts (201); when it is necessary to remove the net cover (1) from the fishing raft (2), first loosen the screws attached to the fixing bolts (106), turn the rotating handles (103) 90° counterclockwise and then remove the net cover (1) is turned clockwise so that the net cover (1) is dragged out of the inner channel of the fishing raft (2); and the net cover (1) is made of an organic material with a density lower than that of water. The mounting structure for a net cover of a fish suction raft of an aquaculture vessel according to claim 1, wherein a plurality of handles (102) for rotating the net cover (1) are arranged vertically on a side wall of the net cover (1). The mounting structure for a net cover of a fish suction raft of an aquaculture vessel according to claim 1, wherein a suspension ring (105) is provided on the top of the net cover (1), and the suspension ring (105) is pulled by a rope. The mounting structure for a net cover of a fish suction raft of an aquaculture vessel according to claim 1, wherein the suspension ring (105), the clamping strips (104) and the rotating handles (103) are mounted together to form an assembly mounted on a net cover body (101). ), and the fixing bolts (106) are used to fix the rotating handles (103) to prevent rotation, so that the clamping strips (104) are firmly attached to the clamping posts (201), to have an effect of fixing the net cover (1). The mounting structure for a net cover of a fish suction raft of an aquaculture vessel according to claim 1, wherein the organic material is polypropylene having a material density of 0.87 kg/dm'. The mounting structure for a net cover of a fish suction raft of an aquaculture vessel according to claim 1, wherein the net cover (1) has a weight of 25 kilograms and a total density of 0.95 kg/dm', and can automatically float on a surface of breeding water from a breeding cabin after being dismantled. The mounting structure for a net cover of a fish suction raft of an aquaculture vessel according to claim 2, wherein the handles (102) are further mounted on the net cover (1), and wherein the handles (102) are above the rotating handles (103) .