A bottom-set net cage with segmented lifting control

Abstract

The present application relates to a kind of bottom-supported net cage of segmented lifting control, comprising: net cage body, and variable buoyancy cabin is arranged at the bottom of net cage body;Air pipe, one end of the air pipe is connected to the variable buoyancy cabin;Air pump, the air pump is connected with the end of the air pipe extending to sea surface;First drain pipe, one end of the first drain pipe is arranged in the first preset position in the variable buoyancy cabin;First switch valve, the first switch valve is arranged on the first drain pipe;First counterweight, the first counterweight is connected to the bottom of the net cage body;Second counterweight, the second counterweight is connected to first counterweight by the rope of preset length.Net cage body will hover in the water layer at a certain distance from the sea bottom during floating, so that the cultured fish in the net cage body has sufficient time to adapt to pressure change, and reduces the risk of rising air bladder to cultured fish caused by huge pressure difference.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of aquaculture, in particular to a bottom-sitting net cage with segmented lifting control. BACKGROUND

[0002] In recent years, the full-submersible bottom-sitting net cage has been widely applied due to its advantage of avoiding the attack of typhoon and other severe sea conditions. However, during the cultivation process, the net cage often needs to be lifted to the sea surface by a lifting device for operations such as fry release, fishing and management and maintenance. The existing lifting device directly floats the net cage sunk in the seabed to the sea surface by means of inflation. The great pressure difference caused by this method is easy to cause the faring of the cultivated fish, which may cause damage to the body and even death. SUMMARY

[0003] In view of the above problems, the present application provides a bottom-sitting net cage with segmented lifting control, which solves the problem that the existing lifting device of the bottom-sitting net cage directly floats from the seabed to the sea surface by means of inflation, which causes a pressure difference that is easy to cause the faring of the cultivated fish, which may cause damage to the body and even death.

[0004] To achieve the above-mentioned purpose, the inventors provide a bottom-sitting net cage with segmented lifting control, which comprises:

[0005] a net cage body,

[0006] a variable buoyancy tank arranged at the bottom of the net cage body, wherein the variable buoyancy tank is provided with a drainage port at the bottom;

[0007] an inflation pipe, one end of the inflation pipe being connected to the variable buoyancy tank, and the other end of the inflation pipe extending to the outside of the sea surface;

[0008] a gas pump, the gas pump being connected to the end of the inflation pipe extending to the outside of the sea surface;

[0009] a first drainage pipe, one end of the first drainage pipe being arranged at a first preset position in the variable buoyancy tank, and the other end of the first drainage pipe being arranged outside the variable buoyancy tank;

[0010] a first on-off valve, the first on-off valve being arranged on the first drainage pipe, and the first on-off valve being used to open or close the first drainage pipe;

[0011] a first counterweight, the first counterweight being connected to the bottom of the net cage body;

[0012] a second counterweight, the second counterweight being connected to the first counterweight by a rope with a preset length.

[0013] In some embodiments, a second drain pipe is further included, one end of the second drain pipe is arranged at a second preset position inside the variable buoyancy chamber, the other end of the second drain pipe is arranged outside the variable buoyancy chamber, and the second preset position is lower than the first preset position.

[0014] A second switch valve is arranged on the second drain pipe, and the second switch valve is used to open or close the second drain pipe.

[0015] A third counterweight is connected to the second counterweight through a rope with a preset length.

[0016] In some embodiments, the end of the inflatable pipe extending out of the sea surface is detachably connected to the air pump.

[0017] In some embodiments, the end of the inflatable pipe extending out of the sea surface is provided with a floating ball.

[0018] In some embodiments, the net cage body is a conical bottom-sitting net cage.

[0019] In some embodiments, a hollow pipe is arranged at the center position of the net cage body, one end of the hollow pipe is connected to the chamber body of the variable buoyancy chamber, and the other end of the hollow pipe extends to the top of the net cage body.

[0020] The first drain pipe is arranged in the hollow pipe, and the other end of the first drain pipe extends out of the top of the net cage body.

[0021] In some embodiments, the first drain pipe is made of stainless steel or pe material.

[0022] In some embodiments, the first counterweight and the second counterweight are made of reinforced concrete material.

[0023] In some embodiments, the first counterweight is detachably installed at the bottom of the net cage body.

[0024] In some embodiments, the variable buoyancy chamber is arranged at the center bottom position of the net cage body.

[0025] Differing from the prior art, when the bottom-sitting net cage is sunk to the seabed for operation, the first switch valve on the first drain pipe is opened and the gas pump is used to inflate the inflation pipe, so that the gas enters the variable buoyancy chamber through the inflation pipe, and the seawater in the variable buoyancy chamber is drained from the first drain pipe and the drain port as the gas enters the variable buoyancy chamber. When the seawater in the variable buoyancy chamber is drained to the first preset position, the gas in the variable buoyancy chamber is drained from the first drain pipe, and the seawater in the variable buoyancy chamber cannot be drained at this time. At this time, the buoyancy generated by the variable buoyancy chamber can make the net cage body and the first counterweight float upwards, but it is not enough to pull the second counterweight. When the net cage body floats to a certain height from the seabed due to the action of the second counterweight, the first switch valve on the first drain pipe is closed, and the gas in the variable buoyancy chamber cannot be drained from the first drain pipe, so the seawater in the variable buoyancy chamber continues to be drained from the drain port. When the seawater is drained from the variable buoyancy chamber, the net cage body continues to float upwards when the buoyancy generated by the variable buoyancy chamber is enough to pull the second counterweight, until the net cage body floats to the sea surface. By segmenting the floating net cage body, the acceleration generated by the direct floating of the net cage body can be slowed down, the stability of the floating can be controlled, and the net cage body can hover in a water layer at a certain distance from the seabed during the floating process, so that the cultured fish in the net cage body has sufficient time to adapt to the pressure change and reduce the risk of swelling of the cultured fish caused by a large pressure difference.

[0026] The above summary of the invention is only a summary of the technical solutions of the present application. In order to enable those skilled in the art to more clearly understand the technical solutions of the present application, and then can be implemented according to the content of the description and the drawings, and in order to enable the above-mentioned purposes and other purposes, characteristics and advantages of the present application to be more easily understood, the following will be described in combination with the specific embodiments of the present application and the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0027] The drawings are only used to show the principles, implementation manners, applications, characteristics and effects of the specific embodiments of the present application and other related contents, and cannot be considered as limitations of the present application.

[0028] In the drawings of the specification:

[0029] Figure 1 A structural schematic diagram of the segmental lifting control bottom-sitting net cage described in the specific embodiments;

[0030] Figure 2 A structural schematic diagram of the bottom-sitting net cage sinking to the seabed for operation described in the specific embodiments;

[0031] Figure 3A schematic diagram of a structure for floating a bottom-set net cage according to the embodiments

[0032] Figure 4 A schematic diagram of another structure for floating a bottom-set net cage according to the embodiments

[0033] Figure 5 A schematic diagram of another structure for a segmented lifting control of a bottom-set net cage according to the embodiments

[0034] Figure 6 A schematic diagram of another structure for a bottom-set net cage sinking to the seabed for operation according to the embodiments

[0035] The reference signs involved in the above-mentioned figures are explained as follows:

[0036] 1. variable buoyancy chamber,

[0037] 11. drain, 12. hollow tube;

[0038] 2. inflation tube,

[0039] 3. air pump,

[0040] 4. first drain pipe,

[0041] 5. first ballast,

[0042] 6. second ballast,

[0043] 7. second drain pipe,

[0044] 8. third ballast,

[0045] 20. net cage body. Embodiments

[0046] In order to describe possible application scenarios, technical principles, specific embodiments that can be implemented, purposes and effects that can be achieved, etc. of the present application in detail, the following will be described in detail in combination with the specific embodiments listed and with reference to the drawings. The embodiments described in this paper are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0047] In this paper, the term "embodiment" means that the specific features, structures or characteristics described in combination with the embodiment can be included in at least one embodiment of the present application. The term "embodiment" appearing at various positions in the specification does not necessarily refer to the same embodiment, and does not particularly limit the independence or association between other embodiments. In principle, in the present application, as long as there is no technical contradiction or conflict, each technical feature mentioned in each embodiment can be combined in any way to form a corresponding implementable technical solution.

[0048] Unless otherwise defined, the meanings of technical terms used in the present application are the same as those commonly understood by one skilled in the art to which the present application belongs; the use of related terms herein is only for the purpose of describing specific embodiments of the present application, and is not intended to limit the present application.

[0049] In the description of the present application, the phrase "and / or" is a description of a logical relationship between objects, which means that there can be three relationships, for example, A and / or B, which means that there are three cases: A exists, B exists, and A and B exist at the same time. In addition, the character " / " herein generally represents that the associated objects before and after are a "or" logical relationship.

[0050] In the present application, phrases such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual quantity, primary and secondary, or order relationship between the entities or operations.

[0051] In the present application, the phrases "include", "contain", "have" or other similar expressions used in the sentences are intended to cover non-exclusive inclusion, and these expressions do not exclude the presence of other elements in the process, method or product including the described elements, so that the process, method or product including a series of elements can not only include those limited elements, but also include other elements not explicitly listed, or also include elements inherent to such process, method or product.

[0052] As the same as the understanding in the "Guidelines for Examination", in the present application, the expressions "greater than", "less than", "exceed" and the like are understood as not including the number; the expressions "above", "below", "within" and the like are understood as including the number. In addition, in the description of the embodiments of the present application, the meaning of "multiple" is more than two (including two), and similar expressions related to "multiple" are also understood in this way, for example, "multiple groups", "multiple times" and the like, unless otherwise explicitly limited.

[0053] In the description of the embodiments of the present application, the spatial-related expressions used, such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "perpendicular", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the specific embodiments or the drawings, and are only for the convenience of describing the specific embodiments of the present application or for the reader to understand, and are not intended to indicate or imply that the indicated device or component must have a specific position, a specific orientation, or be constructed or operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0054] Unless otherwise defined, or limited by context, the terms used herein such as "mount", "connect", "connection", "fixed", "set", and the like, should be understood to be used in a broad sense. For example, "connection" can be fixed connection, detachable connection, or integral setting; it can be mechanical connection, electrical connection, or communication connection; it can be direct connection, or indirect connection through an intermediate medium; it can be internal connection of two elements, or interaction relationship between two elements. For those skilled in the art to which the present application pertains, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0055] Referring to Figure 1 The embodiment provides a bottom-sitting net cage with segmented lifting control, comprising:

[0056] a net cage body 20,

[0057] a variable buoyancy tank 1 arranged at the bottom of the net cage body 20, wherein the variable buoyancy tank 1 is provided with a drain port 11 at the bottom;

[0058] an inflation pipe 2, one end of the inflation pipe 2 being connected to the variable buoyancy tank 1, and the other end of the inflation pipe 2 extending out of the sea surface;

[0059] a gas pump 3, the gas pump 3 being connected to the end of the inflation pipe 2 extending out of the sea surface;

[0060] a first drain pipe 4, one end of the first drain pipe 4 being arranged at a first preset position in the variable buoyancy tank 1, and the other end of the first drain pipe 4 being arranged outside the variable buoyancy tank 1;

[0061] a first switch valve, the first switch valve being arranged on the first drain pipe 4, and the first switch valve being used for opening or closing the first drain pipe 4;

[0062] a first counterweight 5, the first counterweight 5 being connected to the bottom of the net cage body 20;

[0063] a second counterweight 6, the second counterweight 6 being connected to the first counterweight 5 through a rope with a preset length.

[0064] As Figure 2As shown, when the bottom-set net cage is sunk to the seabed for operation, the gas pump 3 inflates the inflatable pipe 2, and at the same time, the first switch valve on the first drain pipe 4 is opened, so that the gas enters the variable buoyancy tank 1 through the inflatable pipe 2, and as the gas enters the variable buoyancy tank 1, the seawater in the variable buoyancy tank 1 is drained from the first drain pipe 4 and the drain port 11, and as the seawater is drained, the gas entering the variable buoyancy tank 1 from the inflatable pipe 2 is drained from the first drain pipe 4, and at this time, the seawater in the variable buoyancy tank 1 cannot be drained, and at this time, the buoyancy generated by the variable buoyancy tank 1 can make the net cage body 20 and the first counterweight 5 float up, but it is not enough to pull the second counterweight 6, and when the net cage body 20 floats to a certain height from the seabed, the first switch valve on the first drain pipe 4 is closed, and the gas in the variable buoyancy tank 1 cannot be drained from the first drain pipe 4, so the seawater in the variable buoyancy tank 1 continues to be drained from the drain port 11, and as the seawater is drained from the variable buoyancy tank 1, when the buoyancy generated by the variable buoyancy tank 1 is enough to pull the second counterweight, the net cage body 20 will continue to float up, as shown in Figure 3 As shown, due to the action of the second counterweight 6, the net cage body 20 is suspended at a certain height from the seabed, and at this time, the first switch valve on the first drain pipe 4 is closed, and the gas in the variable buoyancy tank 1 cannot be drained from the first drain pipe 4, so the seawater in the variable buoyancy tank 1 continues to be drained from the drain port 11, and as the seawater is drained from the variable buoyancy tank 1, when the buoyancy generated by the variable buoyancy tank 1 is enough to pull the second counterweight, the net cage body 20 will continue to float up, as shown in Figure 4 As shown, until the net cage body 20 floats to the sea surface. By segmenting the floating net cage body 20, the acceleration generated by the direct floating of the net cage body 20 can be slowed down, and the stability of the floating can be controlled, and at the same time, the net cage body 20 will hover in a water layer at a certain distance from the seabed during the floating process, so that the cultured fish in the net cage body 20 has sufficient time to adapt to the pressure change, and the risk of fin swelling caused by large pressure difference is reduced.

[0065] A set of economic lifting device is designed for the fully submerged bottom-set culture net cage, especially the deep water bottom-set net cage, so that the speed of the net cage during the floating process is slowed down, and the net cage can hover in different water layers, so that the cultured fish can adapt to the pressure change caused by the floating of the net cage, and the purpose of reducing the injury of the fish and ensuring the safety of the culture is achieved.

[0066] When the net cage body 20 needs to be sunk into the seabed, the switch valve on the first drain pipe 4 is opened, and due to the action of the first counterweight 5 and the second counterweight 6, the seawater enters the tank body of the variable buoyancy tank 1 from the drain port 11 at the bottom of the variable buoyancy tank 1, and at the same time, the buoyancy of the net cage body 20 becomes smaller, and the net cage body 20 sinks, at this time, the first switch valve is opened, and the gas pump 3 is controlled to inflate, and when the seawater enters the variable buoyancy tank 1 to a first preset position, at this time, the net cage body 20 sinks to a certain specific distance from the seabed, and hovers at this position, then the gas pump 3 is closed, then the seawater enters the variable buoyancy tank 1 from the first drain pipe 4, and then the net cage body 20 sinks into the seabed.

[0067] As shown inFigure 5 In some embodiments, as shown, a second drain pipe 7 is also included, one end of the second drain pipe 7 is arranged at a second preset position inside the variable buoyancy chamber 1, the other end of the second drain pipe 7 is arranged outside the variable buoyancy chamber 1, and the second preset position is lower than the first preset position;

[0068] A second switch valve is arranged on the second drain pipe 7, and the second switch valve is used to open or close the second drain pipe 7.

[0069] A third counterweight 8 is connected to the second counterweight 6 through a rope with a preset length.

[0070] To avoid a deeper seabed, by arranging the second drain pipe 7 and the third counterweight 8, as Figure 6As shown, when the bottom-set net cage is sunk to the seabed for operation, the gas pump 3 is used to inflate the inflatable pipe 2, and at the same time, the first switch valve on the first drain pipe 4 is opened, so that the gas enters the variable buoyancy tank 1 through the inflatable pipe 2, and at the same time, the seawater in the variable buoyancy tank 1 is drained from the first drain pipe 4 and the drain port 11. As the seawater is drained, the gas entering the variable buoyancy tank 1 from the inflatable pipe 2 is drained from the first drain pipe 4, and at this time, the seawater in the variable buoyancy tank 1 cannot be drained, and at this time, the buoyancy generated by the variable buoyancy tank 1 can make the net cage body 20 and the first counterweight 5 float up, but not enough to pull the second counterweight 6. When the net cage body 20 floats to a certain height from the seabed, the net cage body 20 is suspended at a certain height from the seabed due to the action of the second counterweight 6, and at this time, the first switch valve on the first drain pipe 4 is closed, and the gas in the variable buoyancy tank 1 cannot be drained from the first drain pipe 4, and at the same time, the second switch valve on the second drain pipe 7 is opened, so that the seawater in the variable buoyancy tank 1 is drained from the drain port 11 and the second drain pipe 7. As the seawater is drained from the variable buoyancy tank 1, the air entering the variable buoyancy tank 1 is drained from the second drain pipe 7, and at this time, the buoyancy generated by the variable buoyancy tank 1 is enough to pull the second counterweight, but not enough to pull the third counterweight 8, and the net cage body 20 floats up again. When the net cage body 20 floats up again, the net cage body 20 is suspended in the water due to the action of the third counterweight 8, and at this time, the second switch valve on the second drain pipe 7 is closed, and the air cannot be drained from the second drain pipe 7, and at this time, the seawater in the variable buoyancy tank 1 is continuously drained from the drain port 11. When the buoyancy generated by the variable buoyancy tank 1 is enough to pull the third counterweight 8, the net cage body 20 is pulled up, and the net cage body 20 is floated to the sea surface. By segmenting the net cage body 20, the acceleration generated by the direct floating of the net cage body 20 can be reduced, and the stability of the floating can be controlled. At the same time, the net cage body 20 can be suspended in the water layer at a certain distance from the seabed during the floating process, so that the cultured fish in the net cage body 20 has sufficient time to adapt to the pressure change, and the risk of fin swelling caused by large pressure difference is reduced. In other embodiments, corresponding to different depths of the seabed, more counterweights and drain pipes can be configured to cooperate, so that the net cage body 20 can be suspended in more water layers, and the cultured fish in the net cage body 20 has sufficient time to adapt to the pressure change.

[0071] In some embodiments, the inflatable tube 2 extends to the outside of the sea surface and is detachably connected to the air pump 3. By arranging the inflatable tube 2 to be detachably connected to the air pump 3, the air pump 3 is arranged on the culture fishing boat, and the air pump 3 does not need to be arranged on the sponge. When the net cage body 20 needs to be lifted, the air pump 3 is brought to the position of the bottom-sitting net cage by the culture fishing boat, and the air pump 3 is connected to the inflatable tube 2 to complete the lifting operation. When the lifting operation is completed, the connection between the air pump 3 and the inflatable tube 2 is disconnected, thereby avoiding the problem of damage to the air pump 3 due to environmental reasons caused by long-term stay on the sea surface.

[0072] In some embodiments, the inflatable tube 2 extends to the outside of the sea surface and is provided with a floating ball at one end. By arranging the floating ball at one end of the inflatable tube 2 extending to the outside of the sea surface, one end of the inflatable tube 2 is floated on the sea surface, thereby facilitating the search.

[0073] In some embodiments, the net cage body 20 is a conical bottom-sitting net cage. By arranging the net cage body 20 as a conical bottom-sitting net cage, an upward conical decoupling strand is arranged at the upper part of the net cage body, and a downward conical structure is arranged at the lower part, thereby facilitating the stability of the net cage body 20 during the process of floating or sinking. In other embodiments, the net cage can also be in the shape of a cylinder, a square, etc.

[0074] In some embodiments, a hollow tube 12 is arranged at the center position of the net cage body 20, one end of the hollow tube 12 is connected to the cabin of the variable buoyancy chamber 1, and the other end of the hollow tube 12 extends to the top of the net cage body 20.

[0075] The first drain pipe 4 is arranged in the hollow tube 12, and the other end of the first drain pipe 4 extends out of the top of the net cage body 20.

[0076] In some embodiments, a hollow tube 12 is arranged at the center position of the net cage body 20, one end of the hollow tube 12 is connected to the cabin of the variable buoyancy chamber 1, and the other end of the hollow tube 12 extends to the top of the net cage body 20.

[0077] In some embodiments, the first drain pipe 4 is made of stainless steel or PE material. By setting the first drain pipe 4 to be made of stainless steel or PE material, the corrosion of seawater is avoided. Stainless steel is a short name of stainless acid-resistant steel. Steel that is resistant to air, steam, water and other weak corrosive media or has stainless properties is called stainless steel, which can effectively avoid the corrosion of seawater. PE material is polyethylene (PE for short), which is a thermoplastic resin prepared by polymerization of ethylene. Polyethylene is odorless, non-toxic, and has a wax-like feel. It has excellent low-temperature resistance (minimum use temperature can reach -100 to -70°C), good chemical stability, and can resist the corrosion of most acids and bases (not resistant to acids with oxidizing properties). It is insoluble in common solvents at room temperature, has low water absorption, and excellent electrical insulation.

[0078] In some embodiments, the first counterweight 5 and the second counterweight 6 are made of reinforced concrete material. Reinforced concrete refers to a composite material that improves the mechanical properties of concrete by adding steel mesh, steel plate or fiber to work together. Reinforced concrete material has a certain weight while effectively avoiding the corrosion of seawater. In other embodiments, the first counterweight 5 and the second counterweight 6 can also be made of other materials, such as granite.

[0079] In some embodiments, the first counterweight 5 is detachably installed at the bottom of the cage body 20. By detachably installing the first counterweight 5 at the bottom of the cage body 20, the first counterweight 5 and the second counterweight 6 can be easily detached from the cage body 20.

[0080] In some embodiments, the variable buoyancy tank 1 is arranged at the center bottom position of the cage body 20. By arranging the variable buoyancy tank 1 at the center bottom position of the cage body 20, the cage body 20 can be stably provided with buoyancy and sinking force.

[0081] As shown, the lifting device of the segmental lifting control bottom-set net cage mainly consists of air pump 3, inflation pipe 2, drainage pipe (including short drainage pipe and long drainage pipe), variable buoyancy cabin 1 and counterweight (including first counterweight 5, second counterweight 6 and third counterweight 8) and other facilities. Air pump 3, according to the water depth requirement, selects air pump 3 with sufficient pressure, which is installed on the ship and is mainly used for inflating and draining the variable buoyancy cabin 1 in the bottom-set net cage. Inflation pipe 2 is a pressure-resistant one-way hose connecting the variable buoyancy cabin 1 and the air pump 3, and the sea surface end is tied with a floating ball when not inflated, which floats on the sea surface for easy finding. The net cage body 20 is a conical fully submerged bottom-set net cage with a steel structure frame and an hdpe material net, which is usually bred to sink into the seabed, and is floated on the water surface when the net is changed and fishing is operated. The short drainage pipe (i.e. the first drainage pipe 4) is made of stainless steel or pe material, the lower end of the short drainage pipe is connected to the variable buoyancy cabin 1 at the bottom of the net cage, the upper end of the short drainage pipe extends out of the top surface of the net cage, and a switch valve (i.e. the first switch valve) is arranged on the upper end. The long drainage pipe is made of the same material, has the same function and is installed at the same position as the short drainage pipe, but the pipe is longer than the short drainage pipe. The variable buoyancy cabin 1 is arranged in the inner cavity chamber at the center bottom of the net cage body 20, the chamber is connected with the inflation pipe 2 and the drainage pipe, and a drainage port 11 is arranged at the lower part. The fully submerged bottom-set net cage controls the lifting of the net cage by inflating and draining or draining and inflating the variable buoyancy cabin 1. The counterweight is made of reinforced concrete and is divided into three parts: the first counterweight 5, the second counterweight 6 and the third counterweight 8. The first counterweight 5 is connected to the bottom of the net cage by a shackle, and the other two counterweights are connected in series with the first counterweight 5 by a rope, which is mainly used for balancing the buoyancy of the net cage to achieve the function of hovering and slow rising, and the weight of each counterweight is calculated according to the balance weight required by the different buoyancy generated by the variable buoyancy cabin 1. The scope of rights of the present application is not limited to conical net cages, but is also applicable to cylindrical, square and other shaped net cages. Any design that realizes segmental lifting by adjusting the volume of the buoyancy cabin and the counterweight is within the protection scope of the present patent.

[0082] The method for lifting the conical bottom net cage is as follows: the management ship is driven to the sea area for aquaculture, the inflatable tube 2 floating on the sea surface is connected with the air pump 3, and the inflatable tube 2 is inflated, at the same time, the switch valve (first switch valve) at the upper end of the short drain pipe (first drain pipe 4) is opened, the switch valves at the upper end of the first drain pipe 4 and the second drain pipe 7 are closed, and air is pumped into the variable buoyancy chamber 1, and the seawater in the variable buoyancy chamber 1 is discharged through the short drain pipe and the drain port 11 at the bottom of the variable buoyancy chamber 1, when the seawater level in the variable buoyancy chamber 1 is below the upper end of the short drain pipe, the air will be discharged from the short drain pipe, and the seawater in the variable buoyancy chamber 1 will not be continuously discharged, at this time, the generated buoyancy promotes the net cage body 20 and the first counterweight 5 to float together, but it is not enough to pull up the second counterweight 6, and the net cage body 20 hovers in the water layer at a certain height from the seabed. At this time, the switch valve of the short drain pipe is closed, the switch valve (second switch valve) of the long drain pipe (second drain pipe 7) is opened, and the inflation is continued, and the seawater is discharged from the long drain pipe and the drain port 11 at the bottom of the variable buoyancy chamber 1, and for the same reason, when the seawater level in the variable buoyancy chamber 1 is below the upper end of the long drain pipe, the seawater cannot be continuously discharged, at this time, the buoyancy generated by the variable buoyancy chamber 1 is enough to pull up the second counterweight 6, but it is not enough to pull up the third counterweight 8, and the net cage body 20 hovers in the water layer higher from the seabed, at this time, if the net cage body 20 continues to float, the switch valve of the long drain pipe needs to be closed, and the inflation is continued until the seawater in the variable buoyancy chamber 1 is discharged, and the generated buoyancy is enough to pull the third counterweight, at this time, the net cage body 20 can float on the water surface. By segmenting the net cage body 20, the acceleration generated by the direct floating of the net cage body 20 can be slowed down, the stability of the floating can be controlled, and the net cage can hover in different water layers, so that the fish has sufficient time to adapt to the pressure change, and the risk of air bladder expansion caused by large pressure difference is reduced.

[0083] The principle of sinking the net cage body 20 is the same, the air pump 3 is closed, the seawater enters the variable buoyancy chamber 1 through the drain port 11 at the bottom of the variable buoyancy chamber 1, the buoyancy of the net cage body 20 decreases, the net cage body 20 sinks, at this time, the switch valve of the long drain pipe is opened, the inflation is carried out, the net cage body 20 hovers, the switch valve of the long drain pipe is continuously closed, the switch valve of the short drain pipe is opened, the sinking is continued, the inflation is carried out, and finally the air pump 3 is turned off, the inflatable tube 2 is disconnected, and the net cage body 20 sinks to the bottom, thereby realizing the lifting operation process.

[0084] In actual production, a reasonable number of segments can be set according to the water depth of the sea area to ensure the safety of aquaculture production.

[0085] Finally, it should be noted that the above embodiments have been described in the specification and drawings of the application, but this does not limit the patent protection scope of the application. Any equivalent structure or equivalent process replacement or modification based on the essential concept of the application, using the content described in the specification and drawings of the application, and directly or indirectly implementing the technical solutions of the above embodiments in other related technical fields, etc., are all included in the patent protection scope of the application.

Claims

1. A bottom settled net cage with segmented lift control, characterized in that, The application relates to a net cage, which comprises the following components: a net cage body, a variable buoyancy cabin arranged at the bottom of the net cage body, wherein the bottom of the variable buoyancy cabin is provided with a drainage port; an air charging pipe, one end of the air charging pipe being connected to the variable buoyancy cabin, and the other end of the air charging pipe extending out of the sea surface; an air pump, the air pump being connected to the end of the air charging pipe extending out of the sea surface; a first drainage pipe, one end of the first drainage pipe being arranged at a first preset position in the variable buoyancy cabin, and the other end of the first drainage pipe being arranged outside the variable buoyancy cabin; a first switch valve, the first switch valve being arranged on the first drainage pipe and being used for opening or closing the first drainage pipe; a first counterweight, the first counterweight being connected to the bottom of the net cage body; a second counterweight, the second counterweight being connected to the first counterweight through a rope with a preset length; a second drainage pipe, one end of the second drainage pipe being arranged at a second preset position in the variable buoyancy cabin, and the other end of the second drainage pipe being arranged outside the variable buoyancy cabin, wherein the second preset position is lower than the first preset position; a second switch valve, the second switch valve being arranged on the second drainage pipe and being used for opening or closing the second drainage pipe; a third counterweight, the third counterweight being connected to the second counterweight through a rope with a preset length; a float ball arranged at the end of the air charging pipe extending out of the sea surface; and the net cage body being a conical bottom-sitting net cage. The end of the air charging pipe extending out of the sea surface is detachably connected to the air pump. A hollow pipe is arranged at the central position of the net cage body, one end of the hollow pipe being connected to the cabin body of the variable buoyancy cabin, and the other end of the hollow pipe extending to the top of the net cage body. The first drainage pipe is arranged in the hollow pipe, and the other end of the first drainage pipe extends out of the top of the net cage body. The first drainage pipe is made of stainless steel or pe material. The first counterweight and the second counterweight are made of reinforced concrete material. The first counterweight is detachably arranged at the bottom of the net cage body. The variable buoyancy cabin is arranged at the central bottom position of the net cage body. ​ ​ ​ ​ ​ ​ 2. The segmentally hoisted controlled bottom net cage according to claim 1, characterized in that, ​ 3. The lift controlled, bottom resting net pen of claim 1, wherein, ​ ​ 4. The segmentally hoisted controlled bottom net cage according to claim 1, characterized in that, ​ 5. The lift controlled, bottom resting net pen of claim 1, wherein, ​ 6. The segmentally hoisted controlled bottom net cage according to claim 1, characterized in that, ​ 7. The lift controlled, bottom resting net pen of claim 1, wherein, ​

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