CN114868693B - Cage culture fish separating device and method - Google Patents

Abstract

The invention discloses a cage culture fish separating device and method, comprising a culture outer box and a culture inner box which are coaxially sleeved, wherein the space between the culture outer box and the culture inner box is divided into a plurality of culture units, and the mesh numbers of the meshes of the corresponding different culture units on the side wall of the culture inner box are different; an aeration assembly is arranged in the inner culture box, and a pollution discharge assembly is arranged at the bottom of the inner culture box; the aeration assembly comprises an aeration net cage and an aeration pipe group in the aeration net cage; the aeration pipe group comprises a first aeration pipe, a transition pipe and a second aeration pipe, and the outlet end of the second aeration pipe is arranged towards the side wall of the aeration net cage; the aeration pipe is connected with the aerator, and the exhaust end of the aeration pipe penetrates through the side wall of the second aeration pipe and is arranged towards the side wall of the aeration net cage; the bottom of the aeration net cage is provided with a filtering bottom plate, and the sewage discharging component is arranged below the filtering bottom plate. The fish separating device is simple in structure, can automatically separate fish, has small damage to fish bodies, can provide an excellent living environment for fish fries, and improves the survival rate of the fish fries.

Description

Cage culture fish separating device and method

Technical Field

The invention belongs to the technical field of aquatic product culture, and particularly relates to a cage culture fish separating device and method.

Background

In the process of culturing fish fries, individual sizes of the fish fries are different due to the differences of incubation time, feeding, congenital reasons and the like. The individual sizes of the fries are larger, so that accidents of eating small fishes by big fishes can occur. In order to avoid the situation that large fish deprives small fish and contends with each other, and meanwhile, the fries with different sizes can absorb the due nutrition components in the growth stage, so that the effect of stable growth of the fries is achieved, people usually adopt a graded culture method, namely, the fries are graded at a certain time, and the large and small fries are separated for culture.

The invention application with the publication number of CN113455445A discloses a fish fry grading device and a method thereof, the fish fry grading device comprises a breeding box, wherein a grading component and a control component are arranged in the breeding box, the right side of the breeding box is provided with a box door, an oxygen-introducing component and a cleaning component are arranged below the breeding box, the grading component and the adjusting component are arranged, a first screw rod and a second screw rod are respectively driven to rotate by rotating corresponding hand wheels, the positions of a left grading plate and a right grading plate are adjusted, the sizes of living spaces of fish fries at all levels are conveniently adjusted, the fish fries are placed on the left side of the breeding box, a water inlet valve and a water outlet valve are opened, a water pump drives water to enter from a water inlet pipe, the water is uniformly sprayed to the right side through a water spraying plate and then enters into a water outlet pipe, the fish fries with smaller volume enter the middle part of the breeding box through a large horn mouth on the left grading plate, and the fish fries with the smallest volume enter the right part of the breeding box through a small horn mouth on the right grading plate, so that the problems of manual grading and poor efficiency and effect are solved.

The invention of the grant publication CN105357958B discloses an apparatus for fish farming comprising a central tank and one or more surrounding tanks, wherein the central tank is used for water treatment and the one or more surrounding tanks are used for farming fish, the fish farming apparatus further comprising a flow applicator, whereby the water flow velocity in the surrounding tanks is individually independent of the water exchange velocity, wherein the fish farming apparatus comprises in each surrounding tank a plurality of movable and permeable section walls dividing the surrounding tank into tank sections, each surrounding tank being provided with one or two outlets and one or two inlets, and a substantially horizontal/laminar water flow structure is provided in each of said one or more surrounding tanks. Furthermore, the use of fish farming plants for producing fish in particular where high flow rates are highly desirable and where horizontal/laminar flow structures are desirable is described.

The invention with the authorized bulletin number of CN105532544B discloses a fish fry grading device, wherein a net sheet is arranged in a water tank and is divided into an area A and an area B, the net sheet is arranged on a moving mechanism which enables the net sheet to move along the plane of the net sheet, the net sheet is formed by connecting at least two sections, and the two sections of net sheet are respectively a large net section and a small net section, wherein the large net is equal to the boundary line size to be graded, and the small net is smaller than the minimum fish fry size. According to the grading method, firstly, the young fish is completely induced into the first area by using the feed and then blocked between the two areas by using the large mesh section, then, the small young fish is completely induced into the second area by using the feed through the net sheet and then blocked between the two areas by using the small mesh section, so that the young fish and the small young fish are separated. The invention completely utilizes the requirements of the fries on the feed to ensure that the fries move to a designated area in the water tank, does not have a forced filtering means, ensures that the fries are not damaged, and improves the growth rate and survival rate of subsequent cultivation.

Disclosure of Invention

The invention aims to provide a net cage culture fish separating device and method which can realize automatic fish separating, can improve water quality and have good pollution discharge effect, and the device has a simple structure, is simple and easy to operate, and has high fry survival rate.

The technical scheme adopted by the invention for achieving the purpose is as follows:

the net cage culture fish separating device comprises a culture outer box and a culture inner box which are coaxially sleeved, wherein the side walls of the culture outer box and the culture inner box are provided with net clothes, the space between the culture outer box and the culture inner box is divided into a plurality of culture units, and the mesh numbers of the net clothes corresponding to different culture units on the side walls of the culture inner box are different, namely, the mesh sizes are different;

an aeration assembly is arranged in the inner culture box, and a sewage discharging assembly is arranged at the bottom of the inner culture box;

the aeration assembly comprises an aeration net cage sleeved in the inner cultivation box and an aeration pipe group arranged in the aeration net cage; the top end and the bottom end of the aeration net cage are matched with the inner culture cage through bearings; the aeration pipe group comprises a first aeration pipe, a transition pipe and a second aeration pipe which are sequentially connected, the first aeration pipe is vertically arranged, the second aeration pipe is horizontally arranged, and the outlet end of the second aeration pipe is arranged towards the side wall of the aeration net cage; the output end of the aerator is connected with an aeration conduit, and the exhaust end of the aeration conduit passes through the side wall of the second aeration pipe and is arranged towards the side wall of the aeration net cage; the bottom of the aeration net cage is provided with a filtering bottom plate, and the sewage discharging component is arranged below the filtering bottom plate.

By adopting the technical scheme, the plurality of cultivation units between the cultivation outer box and the cultivation inner box can be separated by the netting, in order to avoid fish fries from the inside of the cultivation units to the outside of the cultivation outer box, the meshes of the netting on the side wall of the cultivation outer box are smaller than the size of the first fish fries, and also in order to avoid fish fries in different cultivation units to enter and exit randomly, the meshes of the netting for separating the cultivation units are also smaller than the size of the smallest fish fries.

Therefore, after the fries enter the inner cultivation box, the fries can pass through the netting on the side wall of the inner cultivation box to enter different cultivation units under the condition of fish food attraction or water disturbance. The fish fries with larger body sizes in the fish shoal can only enter the same culture unit through the netting with larger meshes. In addition, the fish fries with smaller body sizes can enter other culture units through the larger-mesh netting or the netting with moderate meshes. However, when the small fish fry is attacked or threatened by the large fish fry or is attracted by the fish food, the small fish fry can easily escape to the inner culture box, and further smoothly pass through the small-mesh netting to enter a correct culture space. Therefore, automatic fish separation can be realized, labor cost can be saved, damage of fish separation to fish fries can be reduced, and the survival rate of the fish fries is improved.

The inner cultivation box is provided with the aeration assembly, the aeration assembly is connected with the aerator through the aeration conduit, fresh gas is introduced into the water body in the outer cultivation box, the oxygen content of the water body is improved, the breeding of harmful microorganisms is reduced, and a good living environment is provided for the growth of fish fries. The setting of blowdown subassembly can in time clear away fish food residue, fry excrement and urine and other impurity in the water, improves the cleanliness of aquaculture water. Thus, the method is beneficial to the health of the fries and improves the survival rate of the fries.

In addition, in the process of delivering aeration gas to the outlet end of the second aeration pipe and discharging the aeration gas by the aeration pipe, the flow of the gas can promote the water body below the first aeration pipe to move towards the second aeration pipe through the transition pipe by the siphon principle.

Therefore, the water body at the bottom of the inner culture box and the outer culture box outside the aeration box can be guided to flow towards the aeration box, the water body exchange is promoted, the swimming of the fish shoals in the culture space range can be promoted, and the fish shoals are promoted to exercise. In addition, when the water enters into the first aeration pipe from the outside, the sediment at the bottom of the cultivation outer box and the cultivation inner box is guided into the aeration net box, and then discharged into the sewage discharging assembly through the filtering bottom plate, so that the bottom sewage is cleaned, the water quality of the cultivation water is improved, the normal growth of fish fries is ensured, and the survival rate is improved.

Further, one end of the first aerator pipe far away from the transition pipe is provided with a filter sleeve body. Therefore, the water body entering the first aeration pipe can be filtered through the filter sleeve body, the blocking of the aeration pipe group can be avoided, and auxiliary pollution discharge can be realized.

Further, a floating body is arranged at the top of the aeration net cage, the aerator is arranged above the floating body, and the aeration conduit penetrates through the floating body to be matched with the second aeration pipe; the inside of the aeration net cage is vertically provided with a supporting rod, the upper end and the lower end of the supporting rod are respectively connected with the floating body and the filtering bottom plate, and the first aeration pipe is fixedly connected with the supporting rod through the connecting sleeve body.

Therefore, the position of the aeration pipe group in the aeration net cage can be fixed through the arrangement of the floating body and the supporting rod, and the structural shape of the aeration net cage can be kept unchanged.

According to one embodiment of the invention, the middle part of the first aeration pipe is provided with a first rotating shaft which is coaxially arranged, the middle part of the first rotating shaft is provided with a first rotating blade, the top of the first rotating shaft stretches into the transition pipe, the tail end of the top of the first rotating shaft is provided with a second rotating blade, and the first rotating blade and the second rotating blade can synchronously rotate along with the first rotating shaft.

Further, the first rotating shaft is matched with the side wall of the first aeration pipe through an annular connecting piece. The external diameter of annular connecting piece passes through sealing connection with the inner wall of first aeration pipe, and the internal diameter of annular connecting piece is laminated with the outer wall of first pivot mutually. In addition, the body of the annular connecting piece is also provided with a through hole for water to pass through.

Therefore, in the process that the water body below the first aeration pipe flows upwards under the siphon action, the first rotary vane and the second rotary vane on the first rotary shaft can be driven to rotate, so that a rotational flow is formed in the aeration pipe group, the energy of the water body is improved, and the flow and exchange of the water body at the bottom are promoted. In addition, the rotation of the first rotary vane and the second rotary vane promotes the water body to be in spiral contact with aeration gas, so that the gas and the water body are mixed, the time of the gas in the water can be prolonged, the rotation of the first rotary vane and the second rotary vane also relatively improves the vibration of the first aeration pipe and the parts of the connecting sleeve body, the aeration bubble is promoted to be broken in the water through the vibration of the water body, and the aeration effect is improved.

Further, a coaxially arranged guide cylinder is arranged in the second aeration pipe, and the exhaust end of the aeration pipe is connected with the guide cylinder; the side wall of the flow guide cylinder is connected with the inner wall of the second aeration pipe through a flow guide connecting rod, and one end, far away from the outlet direction of the second aeration pipe, of the flow guide cylinder is provided with a streamline flow guide block.

Therefore, the exhaust end of the aeration conduit passes through the floating body and the side wall of the second aeration pipe to be bound with the guide cylinder, thereby being beneficial to the fixation of the aeration conduit. The arrangement of the flow guide column body and the flow guide block can guide the flow of water flow, so that the flow direction of the water flow is regulated to a certain extent, and the mixing of the water flow and aeration gas is facilitated.

According to one embodiment of the invention, the bottoms of the outer culture box and the inner culture box are respectively provided with a filter bottom net, and the inner diameter of the filter bottom net is matched with the outer diameter of the filter bottom plate. So, through the cooperation of filter bottom net and filtering bottom plate, can filter the water of breeding the outer container and breeding the inner box, help improving the blowdown effect.

Further, the blowdown subassembly includes the blowdown base member of funnel shape, and the top opening of blowdown base member and the bottom looks adaptation of breeding the outer container, and the drain that locates blowdown base member bottom is connected with the blow off body. The inside of blowdown base member is vertical to be equipped with the blowdown support column, and the bottom cover of blowdown support column is established in the drain, and the inside cavity of blowdown support column to the bottom of blowdown support column is equipped with the blowdown hole, and the blowdown hole exposes in the top of drain.

Therefore, impurities such as fish food residues, fish fry feces and the like in the outer culture box and the inner culture box can enter a sewage draining pipe body connected with a sewage draining outlet through a sewage draining hole on the sewage draining supporting column after entering the sewage draining base body through the filtering bottom net and the filtering bottom plate.

According to one embodiment of the invention, the top end of the sewage disposal support column is provided with a second rotating shaft, the side wall of the second rotating shaft is circumferentially provided with a plurality of stirring shafts and a plurality of sewage disposal rotating blades, the outer side tail end of the stirring shaft extends to the side wall of the sewage disposal basal body above the stirring shaft of the sewage disposal rotating She Sheyu.

From this, can drive (mixing) shaft and blowdown revolving leaf through the second pivot and rotate, promote the water to form rotary motion to can scatter the mud that gathers the blowdown base member inside at the rotation in-process, improve the blowdown effect through rotatory rivers, can also avoid the blowdown hole to block up.

In one step of improvement, a plurality of inclined spray heads are circumferentially arranged on the side wall of the sewage disposal basal body. When the sewage is discharged, under the action of the water body external discharge acting force and the action of the spray head acting force, the sewage can be promoted to move towards the sewage hole direction of the sewage support column, so that the sewage is discharged.

According to one embodiment of the invention, the stirring shaft is of a hollow structure, a slot is formed in the side wall of the stirring shaft, a sliding shaft is sleeved in the stirring shaft, a spring is sleeved outside the sliding shaft, an extension rod is arranged on the side wall of the sliding shaft, and one end, far away from the sliding shaft, of the extension rod penetrates through the slot and extends to the outside of the stirring shaft.

Therefore, in the rotating process of the stirring shaft, the sliding shaft inside the stirring shaft can slide relatively along the axial direction and drive the extension rod to generate displacement, so that multidirectional movement is realized, sludge scattering treatment is realized, meanwhile, the sliding of the sliding shaft on the stirring shaft drives the displacement movement of the extension rod to form proper interference on the rotating water body, and the phenomenon that the formed rotating water flow centrifugal force is too large to influence the swimming of upper fishes or cause stress reaction of the upper fishes is avoided.

According to one embodiment of the invention, a plurality of isolating pieces are arranged between the outer culture box and the inner culture box, each isolating piece comprises a culture connecting rod which corresponds up and down, the outer culture box and the inner culture box are respectively connected with two ends of each culture connecting rod, the culture connecting rods extend along the radial direction, and a netting is arranged between the corresponding upper and lower culture connecting rods; the cultivation connecting rod is arranged along the radial direction of the cultivation outer box, and the cultivation connecting rod corresponding to the cultivation connecting rod from top to bottom can synchronously rotate around the axis of the cultivation outer box.

Therefore, the space size of the corresponding culture unit can be adjusted by moving the culture connecting rod. Correspondingly, the width of the netting on the side wall of the inner culture box can be adjusted along with the movement of the culture connecting rod, so that fish fries with different sizes are prevented from being mixed into the same culture unit.

The invention provides a fish separating method for cage culture, which adopts one of the cage culture fish separating devices, wherein a first culture unit, a second culture unit and a third culture unit which are connected end to end are arranged between a culture outer box and a culture inner box, the mesh number of the inner culture box corresponding to the first culture unit is large, the mesh number of the inner culture box corresponding to the third culture unit is small, and the mesh number of the inner culture box corresponding to the second culture unit is moderate, and the method comprises the following steps:

s1, enclosing fish fries with different sizes in a breeding pond between a breeding inner box and an aeration net cage; starting an aeration assembly, forming local disturbance to drive fish shoals through aeration air flow, attracting fish fries of different sizes in the fish shoals by adopting fish food and the like to enter a first cultivation unit, a second cultivation unit or a third cultivation unit through corresponding mesh netting on the side wall of the inner cultivation box, wherein the fish fries with larger sizes in the fish shoals only enter the third cultivation unit, and the fish fries with smaller sizes in the first cultivation unit only enter the third cultivation unit;

s2, after the number of the individual fishes in the first culturing unit reaches the expected target, fishing the fries in the first culturing unit, and manufacturing disturbance in the third culturing unit and the second culturing unit to drive the smaller fries;

s3, fishing the fries entering the first culturing unit and mixing the fries into the fish shoal obtained in the S2; after the quantity of mixed small-size fries in the second culturing unit is reduced to an expected target, fishing the fish shoals in the second culturing unit;

s4, manufacturing disturbance or fish food attraction in the third culturing unit to promote small-sized and moderate-sized fries to swim out of the third culturing unit, manufacturing disturbance in the second culturing unit to promote small-sized fries to swim into the first culturing unit; fishing the fries entering the first culturing unit and then mixing the fries into the fish shoal obtained in the step S2; fishing the fries entering the breeding unit B and then mixing the fries into the fish shoal obtained in the step S3; and then fishing the remaining fish fries with larger body sizes.

Therefore, the fish separating method is simple, the purpose of automatically separating fish can be achieved, labor force can be saved, and damage to fish fries can be reduced.

According to the invention, as the aeration pipe group is matched with the aeration pipe, on one hand, the oxygen content of the culture water body can be increased, and the culture environment is ensured; on the other hand, the siphon principle can be utilized in the aeration net cage to promote the water body exchange among the outer culture cage, the inner culture cage and the aeration net cage, thereby being beneficial to driving the fish swarm to move, being beneficial to separating fish, promoting the fish fry to move and keeping the activity of the fish fry; in addition, the method is also beneficial to discharging dirt in water, improving the pollution discharge effect and improving the quality of the culture water body, thereby being beneficial to improving the survival rate of fish fries. In the sewage disposal assembly, the stirring shaft, the sewage disposal rotary vane and the spray head are matched to promote the rotation of the sludge, scatter the sludge and prevent the blockage in the sewage disposal process; the arrangement of the sliding shaft and the extension rod on the stirring shaft can improve the sludge scattering effect, and can also form proper interference on the rotating water body, so that the phenomenon that the formed rotating water flow centrifugal force excessively influences the swimming of upper fishes or causes stress reaction of the upper fishes is avoided. Therefore, the invention is a net cage culture fish separating device and method which can realize automatic fish separating and improve water quality, the fish separating method is simple and easy to operate, and the survival rate of fish fries is high.

Drawings

Fig. 1 is a schematic top view of a cage culture fish separating device according to embodiment 1 of the present invention;

FIG. 2 is a schematic view of a part of the internal structure of the cage culture fish separating device shown in FIG. 1;

FIG. 3 is a schematic view of the aeration assembly of the cage culture fish separating device shown in FIG. 2;

FIG. 4 is a schematic view of a mating structure of a first shaft of the aeration assembly of FIG. 3;

FIG. 5 is a schematic view showing the internal structure of a portion of a cage culture fish dividing apparatus according to embodiment 2 of the present invention;

FIG. 6 is a schematic view of a sewage disposal assembly of the cage culture fish separating device shown in FIG. 5;

FIG. 7 is a partially enlarged schematic illustration of portion D of FIG. 6;

fig. 8 is a detailed schematic view of the stirring shaft of the drain assembly of fig. 6.

Reference numerals: a farming outer tank 11; an inner cultivation box 12; a fixed frame 13; a first netting 14; a second netting 15; a filter bottom screen 16; a mounting plate 17; a support link 18; a bearing 19; a cultivation link 20; a first culturing unit 21; a second culturing unit 22; a breeding unit C23; an aeration net cage 31; a fourth netting 32; a float 33; a filter base 34; a support rod 35; a connecting sleeve 36; a first aerator pipe 41; a transition pipe 42; a second aerator pipe 43; an aeration conduit 44; a filter housing 45; a first rotation shaft 51; an annular connector 52; a through hole 53; a first rotary vane 54; a second rotary vane 55; a deflector column 56; a guide block 57; a sewage disposal substrate 61; a drain pipe body 62; a sewage discharge support column 63; a drain hole 64; a second rotating shaft 71; a stirring shaft 72; a slot 73; a slip shaft 74; a spring 75; extension bar 76; a blowdown rotating vane 77; a spray head 78.

Detailed Description

The technical scheme of the invention is further described in detail below with reference to the detailed description and the accompanying drawings. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.

Example 1

Fig. 1 to 4 schematically show a cage culture fish dividing apparatus and method according to an embodiment of the present invention. As shown in the figure, the device comprises a cylindrical cultivation inner box 12 and a cultivation outer box 11 which are coaxially sleeved inside and outside, wherein the two boxes comprise an annular fixing frame 13 which is arranged up and down correspondingly, and side walls which are used for connecting the fixing frames 13 which are arranged up and down correspondingly, and a filtering bottom net 16 is arranged at the bottoms of the cultivation outer box 11 and the cultivation inner box 12 to form a cylindrical net box structure.

The space between the inner cultivation box 12 and the outer cultivation box 11 is divided into three cultivation units by the spacers, namely: cultivation unit A21, cultivation unit B22 and cultivation unit C23.

The side walls of the inner culture box 12 and the outer culture box 11 are both sheet-shaped netting. The first netting 14 with higher mesh number is arranged on the side wall of the outer culture box 11, and meshes are smaller than the size of the smallest fish fry; the side wall of the inner culture box 12 is provided with three groups of second netting 15 with different meshes according to the different corresponding culture units, the second netting 15 corresponding to the first culture unit 21 has larger meshes and small meshes, and only can be used for the entry and exit of the smaller fish fry; the second net corresponding to the third culturing unit 23 has smaller 15 meshes and large meshes, and can be used for the entry and exit of the larger fish fry; the second net 15 corresponding to the second culturing unit 22 has moderate mesh number, and the larger fish fry can not pass through the meshes on the second net, so that the fish fry with moderate size and smaller size can pass through the second net.

The isolating piece comprises a culture connecting rod 20 which corresponds up and down and extends along the radial direction, and the two tail ends of the culture connecting rod 20 which is positioned above are respectively connected with the culture inner box 12 and the fixed frame 13 at the top of the culture outer box 11; the two ends of the cultivation connecting rod 20 positioned below are respectively connected with the cultivation inner box 12 and the fixed frame 13 at the bottom of the cultivation outer box 11. A third net in a sheet shape is arranged between the upper and lower corresponding cultivation connecting rods 20, and in order to prevent fish fries from swimming between different cultivation units through the third net, meshes on the third net are also set to be smaller than the size of the smallest fish fries.

In other embodiments, two cultivation links 20 arranged correspondingly up and down can rotate synchronously around the axis of the cultivation outer box 11/the cultivation inner box 12, so that the space size of different cultivation units can be adjusted. Correspondingly, the second netting 15 on the side wall of the inner culture box 12 is provided with a retraction mechanism, so that the area of the second netting 15 can be adjusted according to the position of the corresponding culture connecting rod 20, and the fish separating effect is ensured.

The inside of the inner cultivation box 12 is provided with an aeration assembly, and the aeration assembly comprises an aeration net cage 31 sleeved inside the inner cultivation box 12, and an aeration pipe group and an aerator which are arranged inside the aeration net cage 31. Annular mounting plates 17 are coaxially sleeved in the fixing frames 13 at the top and the bottom of the inner culture box 12, and the mounting plates 17 are connected with the corresponding fixing frames 13 through supporting connecting rods 18. The top and bottom ends of the aeration net cage 31 are rotatably connected with the mounting plate 17 on the inner culture cage 12 through bearings 19. The side wall of the aeration net 31 is provided with a fourth net 32 having a mesh smaller than the size of the smallest fry.

The aeration pipe group comprises a first aeration pipe 41, a transition pipe 42 and a second aeration pipe 43 which are sequentially connected, wherein the transition pipe 42 is an elbow and is used for connecting the first aeration pipe 41 and the second aeration pipe 43, the first aeration pipe 41 is vertically arranged, and the second aeration pipe 43 is horizontally arranged. The outlet end of the second aeration pipe 43 is provided toward the side wall of the aeration net cage 31. The top of the aeration net cage 31 is provided with a floating body 33, and the aerator is arranged above the floating body 33. The output end of the aerator is connected with an aeration conduit 44, and the exhaust end of the aeration conduit 44 passes through the side wall of the floating body 33 and the second aeration pipe 43 and is arranged towards the side wall of the aeration net cage 31.

The bottom of aeration box with a net 31 is equipped with filtering bottom plate 34, and the inside of aeration box with a net 31 is vertically provided with bracing piece 35, and the upper and lower both ends of bracing piece 35 link to each other with body 33, filtering bottom plate 34 respectively, and first aeration pipe 41 passes through adapter sleeve body 36 and bracing piece 35 fixed connection. The position of the aeration pipe group inside the aeration net cage 31 can be fixed by the cooperation of the supporting rods 35 with the floating body 33 and the filtering bottom plate 34, and the structural shape of the aeration net cage 31 can be kept unchanged.

The end of the first aerator pipe 41 far away from the transition pipe 42 is provided with a filter sleeve 45. The middle part of the first aerator pipe 41 is provided with a first rotating shaft 51 which is coaxially arranged, and the first rotating shaft 51 is matched with the side wall of the first aerator pipe 41 through an annular connecting piece 52. The outer diameter of the annular connecting piece 52 is in sealing connection with the inner wall of the first aerator pipe 41 through a sealing gasket, and the inner diameter of the annular connecting piece 52 is attached to the outer wall of the first rotating shaft 51. In addition, the body of the annular connecting member 52 is provided with a through hole 53 through which water flows.

The middle part of first pivot 51 is equipped with first swivel vane 54, and the top of first pivot 51 stretches into in the transition pipe 42 to the top end of first pivot 51 is equipped with second swivel vane 55, and first swivel vane 54 and second swivel vane 55 can rotate along with first pivot 51 synchronization. Wherein a plurality of first rotary blades 54 are arranged around the first rotary shaft 51, and are integrally horn-shaped with upward openings.

The second aeration pipe 43 is internally provided with a coaxially arranged guide column body 56, and the exhaust end of the aeration conduit 44 is connected with the guide column body 56; the side wall of the flow guiding column body 56 is connected with the inner wall of the second aerator pipe 43 through a flow guiding connecting rod, and one end, far away from the outlet direction of the second aerator pipe 43, of the flow guiding column body 56 is provided with a streamline flow guiding block 57.

Thus, the aeration gas is discharged into the aquaculture water body through the aeration conduit 44 in the aerator, which is helpful for improving the oxygen content of the water body, reducing the breeding of harmful microorganisms and providing a good living environment for the growth of fish fries. During the process of delivering aeration gas to the outlet end of the second aeration pipe 43 and discharging the aeration gas by the aeration pipe 44, the flow of the gas can promote the water body below the first aeration pipe 41 to move towards the second aeration pipe 43 through the transition pipe 42 by the siphon principle.

The water has driven the rotation of first whirl leaf 54 and second whirl leaf 55 in the inside in-process that removes of first aeration pipe 41, and the water of first aeration pipe 41 below is filtered through filtering sleeve body 45 when getting into its inside, can also realize like this that the water of the interior bottom of the outer box 11 of guide outside flows to the inner box 12 of breed, promote the water exchange, and promote the fish school in the breed space scope to move about, promote its exercise, and promote the water to enter into the inside time of first aeration pipe 41, help leading the sediment of breeding outer box 11 and inner box 12 bottom into the aeration box, discharge from filtering bottom plate 34 again, realize the clearance to bottom filth.

In addition, in the working process of the aeration assembly, the rotation of the first rotary vane 54 and the second rotary vane 55 is promoted due to the siphon action, the water body is promoted to be in spiral contact with aeration gas, the mixing of the gas and the water body is facilitated, the residence time of the gas in the water is prolonged, the rotation of the first rotary vane 54 and the second rotary vane 55 relatively improves the vibration of the first aeration pipe 41 and the connecting sleeve body 36, and the aeration effect is improved by promoting the rupture of aeration bubbles in the water through the vibration of the water body.

The bottom of the aeration net cage 31 is provided with a filtering bottom plate 34, the filtering bottom plate 16 is matched with the filtering bottom plate 34, the inner diameter of the filtering bottom plate 16 is matched with the outer diameter of the mounting plate 17, and the outer diameter of the filtering bottom plate 34 is matched with the inner diameter of the filtering mounting plate 17. By matching the filter bottom net 16 with the filter bottom plate 34, the water bodies in the cultivation outer box 11 and the cultivation inner box 12 can be filtered, and the pollution discharge effect can be improved. The drain assembly is disposed below the filter floor 34 and the filter floor screen 16.

When the cage culture fish separating device of the embodiment is used, the following method is adopted when fish separating:

s1, enclosing fish fries with different sizes in a breeding pond between a breeding inner box 12 and an aeration net cage 31; starting an aeration assembly, forming local disturbance to drive fish shoals through aeration air flow, adopting fish food and the like to induce fish fries with different sizes in the fish shoals to enter a first cultivation unit 21, a second cultivation unit 22 or a third cultivation unit 23 through corresponding mesh covers on the side wall of the inner cultivation box 12, wherein only small fish fries in the first cultivation unit 21 can enter and small fish fries and moderate fish fries in the second cultivation unit 22 can swim in due to different mesh numbers of a second mesh cover 15 on the side wall of the inner cultivation box 12 corresponding to the first cultivation unit 21, the second cultivation unit 22 and the third cultivation unit 23; the fish fry with a large body size in the fish shoal can only enter the inside of the breeding unit C23, and the breeding unit C23 can possibly be mixed with the fish fry with a moderate body size and a small body size.

S2, after the number of individuals with smaller body sizes in the first unit to be cultured 21 is enough and the expected target is reached, fishing the fries in the first unit to be cultured 21, adjusting the direction of the outlet end of the second aeration pipe 43 in the aeration assembly, and manufacturing disturbance in the third unit to be cultured 23 and the second unit to be cultured 22 so as to drive the fries with smaller individuals.

S3, fishing the fries entering the first culturing unit 21, mixing the fries into the fish shoal obtained in the S2, and gradually reducing the number of small individual fries in a plurality of culturing units; after the number of mixed small-size fries in the second culturing unit 22 is reduced to the expected target, the shoal in the second culturing unit 22 can be fished, and the number of individual moderate fries in a plurality of culturing units is reduced.

S4, manufacturing disturbance or fish food attraction in the third breeding unit 23, enabling small-sized and moderate-sized fries to swim out of the third breeding unit 23, readjusting the direction of the outlet end of the second aeration pipe 43 in the aeration assembly, manufacturing disturbance in the second breeding unit 22, and enabling small-sized fries to swim into the first breeding unit 21; fishing the fries entering the first culturing unit 21 and then mixing the fries into the fish shoal obtained in the step S2; fishing the fries entering the breeding unit B22 and mixing the fries into the fish shoal obtained in the step S3; and then fishing the remaining fish fries with larger body sizes.

By adopting the method, automatic fish separation can be realized, the labor cost can be saved, the damage of fish separation to fish fries can be reduced, and the survival rate of the fish fries can be improved. The setting of aeration subassembly can form the disturbance when maintaining good aquaculture environment, plays the effect of driving the fish crowd, improves and divides fish efficiency.

Example 2

Fig. 5 to 8 schematically show a cage culture fish dividing apparatus according to another embodiment of the present invention, which is different from example 1 in that:

the blowdown subassembly includes funnel-shaped blowdown base member 61, and the top opening of blowdown base member 61 and the bottom looks adaptation of breeding outer container 11, and the drain that locates the blowdown base member 61 bottom is connected with blowdown body 62. The inside of blowdown base member 61 is vertical to be equipped with blowdown support column 63, and the bottom cover of blowdown support column 63 is established in the drain, and blowdown support column 63 is inside hollow to the bottom of blowdown support column 63 is equipped with blowdown hole 64, and blowdown hole 64 exposes in the top of drain. Impurities such as fish food residues, fish fry feces and the like in the outer culture box 11 and the inner culture box 12 enter the sewage base body 61 through the filter bottom net 16 and the filter bottom plate 34, and then can enter the sewage pipe body 62 connected with the sewage outlet through the sewage holes 64 on the sewage supporting columns 63 to be discharged.

The top of blowdown support column 63 is equipped with second pivot 71, and the lateral wall of second pivot 71 encircles and has laid a plurality of (mixing) shafts 72 and a plurality of blowdown revolving blades 77, and the top of (mixing) shaft 72 is located to blowdown revolving blade 77, and the outside end of (mixing) shaft 72 extends to the lateral wall of blowdown base 61. A plurality of inclined spray heads 78 are circumferentially disposed on the sidewall of the sewage disposal substrate 61.

When the sewage is discharged, under the action of the water body external discharge acting force and the action of the spray head 78, the sewage is promoted to move towards the sewage hole 64 of the sewage supporting column 63, so that the sewage is discharged. In this process, the stirring shaft 72 and the blowdown rotating blades 77 can form a rotating motion, and can scatter sludge collected in the blowdown substrate 61 in the rotating process, so that the blowdown effect is improved by rotating water flow, and the blockage of the blowdown holes 64 can be avoided.

The stirring shaft 72 is of a hollow structure, a slot 73 is formed in the side wall of the stirring shaft 72, a sliding shaft 74 is sleeved in the stirring shaft 72, a spring 75 is sleeved outside the sliding shaft 74, an extension rod 76 is arranged on the side wall of the sliding shaft 74, and one end, far away from the sliding shaft 74, of the extension rod 76 penetrates through the slot in the spring 75 and the slot 73 and stretches to the outside of the stirring shaft 72.

In the process of rotating the stirring shaft 72, the sliding shaft 74 inside the stirring shaft 72 can slide relatively along the axial direction and drive the extension rod 76 to generate displacement, so that multidirectional movement is realized and sludge scattering treatment is realized, meanwhile, the sliding of the sliding shaft 74 on the stirring shaft 72 drives the displacement movement of the extension rod 76 to form proper interference on the rotating water body, and the phenomenon that the formed rotating water flow centrifugal force is too large to influence the swimming of upper fishes or cause stress reaction of the upper fishes is avoided.

Conventional operations in the operation steps of the present invention are well known to those skilled in the art, and are not described herein.

While the foregoing embodiments have been described in detail in connection with the embodiments of the invention, it should be understood that the foregoing embodiments are merely illustrative of the invention and are not intended to limit the invention, and any modifications, additions, substitutions and the like made within the principles of the invention are intended to be included within the scope of the invention.

Claims (6)

1. The net cage culture fish separating device comprises a culture outer box (11) and a culture inner box (12) which are coaxially sleeved, wherein the side walls of the culture outer box (11) and the culture inner box (12) are provided with net clothes, the space between the culture outer box (11) and the culture inner box (12) is divided into a plurality of culture units, and the mesh numbers of the net clothes corresponding to different culture units on the side walls of the culture inner box (12) are different;

it is characterized in that the method comprises the steps of,

an aeration assembly is arranged in the inner culture box (12), and a sewage discharging assembly is arranged at the bottom of the inner culture box (12);

the aeration assembly comprises an aeration net cage (31) and an aeration pipe group arranged inside the aeration net cage (31); the top end and the bottom end of the aeration net cage (31) are matched with the inner culture box (12) through bearings (19); the aeration pipe group comprises a first aeration pipe (41), a transition pipe (42) and a second aeration pipe (43) which are sequentially connected, the first aeration pipe (41) is vertically arranged, the second aeration pipe (43) is horizontally arranged, and the outlet end of the second aeration pipe (43) is arranged towards the side wall of the aeration net cage (31); the output end of the aerator is connected with an aeration conduit (44), and the exhaust end of the aeration conduit (44) passes through the side wall of the second aeration pipe (43) and is arranged towards the side wall of the aeration net cage (31); the bottom of the aeration net cage (31) is provided with a filtering bottom plate (34), and the sewage discharging assembly is arranged below the filtering bottom plate (34);

the middle part of the first aerator pipe (41) is provided with a first rotating shaft (51) which is coaxially arranged, the middle part of the first rotating shaft (51) is provided with a first rotating blade (54), the top of the first rotating shaft (51) stretches into the transition pipe (42), the tail end of the top of the first rotating shaft (51) is provided with a second rotating blade (55), and the first rotating blade (54) and the second rotating blade (55) can synchronously rotate along with the first rotating shaft (51);

a coaxially arranged guide column body (56) is arranged in the second aeration pipe (43), and the exhaust end of the aeration conduit (44) is connected with the guide column body (56); the side wall of the flow guide column body (56) is connected with the inner wall of the second aerator pipe (43) through a flow guide connecting rod, and one end, far away from the outlet direction of the second aerator pipe (43), of the flow guide column body (56) is provided with a streamline flow guide block (57);

the bottoms of the culture outer box (11) and the culture inner box (12) are respectively provided with a filter bottom net (16), and the inner diameter of the filter bottom net (16) is matched with the filter bottom plate (34);

the sewage disposal assembly comprises a funnel-shaped sewage disposal substrate (61), the top opening of the sewage disposal substrate (61) is matched with the bottom of the cultivation outer box (11), and a sewage disposal outlet arranged at the bottom of the sewage disposal substrate (61) is connected with a sewage disposal pipe body (62);

the inside of blowdown base member (61) is vertical to be equipped with blowdown support column (63), the bottom cover of blowdown support column (63) is established in the drain, the inside cavity of blowdown support column (63), and the bottom of blowdown support column (63) is equipped with blowdown hole (64), blowdown hole (64) expose the top of drain.

2. The fish separating device for cage culture according to claim 1, wherein a filter sleeve body (45) is arranged at one end of the first aeration pipe (41) which is far away from the transition pipe (42);

the top of the aeration net cage (31) is provided with a floating body (33), the aerator is arranged above the floating body (33), and the aeration conduit (44) penetrates through the floating body (33) to be matched with the second aeration pipe (43);

the inside of aeration box with a net (31) is vertical to be provided with bracing piece (35), the upper and lower both ends of bracing piece (35) respectively with body (33) filtration bottom plate (34) link to each other, first aeration pipe (41) through adapter sleeve body (36) with bracing piece (35) fixed connection.

3. The fish separating device for cage culture according to claim 1, wherein a second rotating shaft (71) is arranged at the top end of the pollution discharge supporting column (63), a plurality of stirring shafts (72) and a plurality of pollution discharge rotating blades (77) are circumferentially arranged on the side wall of the second rotating shaft (71), the pollution discharge rotating blades (77) are arranged above the stirring shafts (72), and the outer tail end of the stirring shafts (72) extends to the side wall of the pollution discharge basal body (61);

a plurality of spray heads (78) are circumferentially arranged on the side wall of the sewage disposal substrate (61).

4. A fish separating device for cage culture according to claim 3, characterized in that the stirring shaft (72) is of a hollow structure, a slot (73) is formed in the side wall of the stirring shaft (72), a sliding shaft (74) is sleeved in the stirring shaft (72), a spring (75) is sleeved outside the sliding shaft (74), an extension rod (76) is arranged on the side wall of the sliding shaft (74), and one end, far away from the sliding shaft (74), of the extension rod (76) penetrates through the slot (73) to extend to the outside of the stirring shaft (72).

5. The fish separating device for cage culture according to claim 1, wherein a plurality of spacers are arranged between the outer culture box (11) and the inner culture box (12), each spacer comprises a corresponding upper and lower culture connecting rod (20), the outer culture box (11) and the inner culture box (12) are respectively connected with two ends of the corresponding culture connecting rod (20), and a netting is arranged between the corresponding upper and lower culture connecting rods (20);

the cultivation connecting rods (20) are arranged along the radial direction of the cultivation outer box (11), and the cultivation connecting rods (20) corresponding to each other up and down can synchronously rotate around the axis of the cultivation outer box (11).

6. A fish separating method for cage culture, characterized in that a cage culture fish separating device according to any one of claims 1-5 is adopted, a culture unit A (21), a culture unit B (22) and a culture unit C (23) are arranged between a culture outer box (11) and a culture inner box (12), the mesh number of the culture inner box (12) corresponding to the culture unit A (21) is large, the mesh number of the mesh of the culture inner box (12) corresponding to the culture unit C (23) is small, the mesh number of the mesh of the culture inner box (12) corresponding to the culture unit B (22) is moderate, and the method comprises the following steps:

s1, enclosing fish fries with different sizes in a breeding pond between a breeding inner box (12) and an aeration net cage (31); starting an aeration assembly, forming local disturbance to drive fish shoals through aeration air flow, adopting fish food to attract fish fries with different sizes in the fish shoals to enter a first cultivation unit (21), a second cultivation unit (22) or a third cultivation unit (23) through corresponding mesh netting on the side wall of a cultivation inner box (12), wherein the fish fries with larger sizes in the fish shoals can only enter the third cultivation unit (23), and only the fish fries with smaller sizes in the first cultivation unit (21) can enter;

s2, after the number of the individual fishes in the first culture unit (21) reaches an expected target, fishing the fries in the first culture unit (21), and manufacturing disturbance in the third culture unit (23) and the second culture unit (22) to drive the fries with smaller individuals;

s3, fishing the fries entering the first culturing unit (21) and mixing the fries into the fish shoal obtained in the S2; fishing the fish shoal in the second culture unit (22) after the number of mixed small-size fish fries in the second culture unit (22) is reduced to an expected target;

s4, manufacturing disturbance or fish food attraction in the breeding unit C (23) to promote small-sized and moderate-sized fries to swim out of the breeding unit C (23), fishing the fries entering the breeding unit A (21), and mixing the fries into the fish shoal obtained in the S2; fishing the fries entering the breeding unit B (22), and mixing the fries into the fish shoal obtained in the step S3; and then fishing the remaining fish fries with larger body sizes.

Images