49results about How to "Guarantee the breeding effect" patented technology

The invention discloses high-strength nodular cast iron QT900-6 which consists of the following elements in percentage by weight: 3.2-3.7% of C, 2.4-2.8% of Si, less than or equal to 0.2% of Mn, less than or equal to 0.03% of P, 0.005-0.02% of S, 0.8-1.4% of Cu and the balance of Fe and unavoidable trace elements. The high-strength nodular cast iron QT900-6 has high compressive strength, high yield strength and excellent mechanical property.

A spheroidizing treater for producing spheroidal graphite cast iron is carried out by adjusting bearing rod head and dam seam and controlling iron-water and nodulizer contact. It adopts waste-heat one-step method and controls spheroidizing reactive time and strength; the spheroidizing agent consists of Mg<=20%, RE<=3% and Si<=65%. It's simple, cheap and can be used for large-scale continuous production.

The invention relates to a process of melting and field modification treatment of melting ductile iron castings, in particular to a process of melting and field modification treatment of super large ductile iron castings with thick walls, which is characterized in that the invention includes the steps of selecting melting devices, feeding to melt, heat preservation, spheroidization, inoculation and pouring. The processing method of the invention is unique and simple, thereby successfully and effectively resolving the melting of a small-tonnage electric induction furnace on large-tonnage molten iron and the modification treatment of large-tonnage spheroidal graphite cast-iron, which also solves the problems of inner decline of casings with inner walls, graphite segregation of the thick walls and the like.

The invention relates to the technical field of iron casting melting, in particular to a melting technology for a thin-wall ferrite nodular iron casting. The melting technological process comprises the following steps of feeding melting, ingredient fine adjustment, molten iron pretreatment, molten iron refining, spheroidizing treatment and inoculation treatment. According to the technology, the feeding sequence is controlled, so that it is ensured that crystal type cores in cast iron are not be severely damaged by fire, and sufficient crystal type cores are provided for spheroidizing of graphite in molten iron in the later period; the method of adding SiC at the same time is adopted in the pretreatment process, the molten iron is made to sufficiently absorb SiC through electromagnetic stirring force of electric furnace melting, and the pretreatment effect is ensured; the thrice inoculation treatment technology is adopted in the inoculation treatment process, and therefore the inoculation effect on the molten iron is sufficiently ensured; and casting is finished within a short time after molten iron spheroidizing treatment, and the metallographic structure of the casting is ensured.

The present invention provides a method for culturing fish with net cage. Firstly the whole framework of net cage layout is set according to the condition of inland river water and reservoir area water. A frame is installed on the framework. Then a large net cage is installed on the framework. Filter economic fish are cultivated in the large net cage. Finally intensive culture net cages are installed in the large net cage. Bait throwing type fishes are cultivated in the intensive culture net cages. The method for culturing fish with net cage according to the invention adopts the tridimensional inter-culturing mode of different water layers with the fishes with different food habits according to the ecological principle. The bait throwing type fishes are cultivated at the upper layer of the filter economic fish which can eat the excrement and residual bait of bait throwing type fishes. The effects of pollutant discharge amount reduction and environment protection at the state that the cultivation effect of prior fish is guaranteed. The method of the invention also has the advantages of easiness, easy learning, strong adaptability and easy generalization.

The invention provides a temperature control device in seawater breeding pond water reflow treatment. The temperature control device comprises a reflow water tank, a breeding pond and a heat exchange pump; the temperature control device is characterized in that a heat storage water tank and a plurality of heat exchangers are additionally arranged; one water outlet of the heat exchange water tank is communicated with a solar water heater through a water pump; the water outlet of the solar water heater is communicated with a water inlet of the heat storage water tank; another water outlet of the heat storage water tank is communicated with a heat source main pipe through a water source heat pump; the heat source main pipe is communicated with a plurality of heat source branched solenoid valve pipelines; each reflow branch pipe is communicated with the liquid inlet of the corresponding heat exchanger; the liquid discharge port of each heat exchanger is communicated with a reflow port of the breeding pond; each heat source branched solenoid valve is communicated with the water inlet of the corresponding heat exchanger through a heat source branch pipe; the water outlet of each heat exchanger is communicated with a reflow main pipe through a reflow branch pipe; and the reflow main pipe is communicated with the reflow port of the heat storage water tank. The temperature control device provided by the invention has the advantages that no seawater desalination phenomenon exists in reflow water indirect heat exchanging, and the seawater breeding effect is ensured, and moreover, the solar energy and the water source heat pump are complementary.

The invention relates to a core-spun yarn which comprises a sheath and a core material, wherein the core material is tightly filled in the sheath. The invention is characterized in that the sheath comprises an outer steel sheet layer and an inner metal layer; both sides of the sheath are folded inwards at the joints of the sheath and are extruded and fixed; the melting point of the metal layer is smaller than that of steel; and the thickness of the metal layer is 0.2mm, and the thickness of the steel sheet layer is 0.2mm. The double-layer composite sheath is adopted to lower the melting point of the surface covering layer on the premise of ensuring the basic strength of the core-spun yarn, so that the tape base can be molten within a short time in the molten iron casting process, thereby fully displaying the action of the powder inoculant, ensuring the inoculation effect of the molten iron flow and ensuring the mechanical properties of the iron castings. The invention has the advantages of firm sheath joints, tightly filled powder, regular and symmetric appearance, high working stability, high degree of automation and simple overall structure, and is convenient for maintenance and quick for operation.

The invention relates to the field of as-cast high-strength high-elongation synthetic nodular cast iron. The invention relates to as-cast high-strength high-elongation synthetic nodular cast iron anda preparation method thereof. The nodular cast iron is characterized in that under the as-cast condition, the nodular cast iron meets performance requirements that the tensile strength Rm is larger than or equal to 700 MPa, and the percentage elongation A after fracture is larger than or equal to 10%; the matrix is a pearlite-ferrite mixed matrix; the content of pearlite is 55%-75%, a spheroidizing grade is 1-2, a graphite size grade is 6-7, the nodular cast iron is composed of elements, by mass, 3.5%-3.7% of C, 2.9-3.3% of Si, less than or equal to 0.2% of Mn, less than or equal to 0.035% ofP, less than or equal to 0.02% of S, 0.5%-0.7% of Cu, 0.55%-0.75% of Ni, 0.030%-0.065% of Mg and the balance of Fe and trace elements. The method has the beneficial effects that scrap steel and raw material pure iron are adopted for recarburization, base iron is smelted in a medium-frequency induction furnace, then pretreatment, spheroidizing treatment and inoculation treatment are conducted, final pouring is conducted, and QT700-10 is achieved under the as-cast condition.

The invention relates to a breeding method of masu salmons, relating to a breeding method of fishes. The method solves the technical problem that existing introduced masu salmons are featured with genetic drift, weak resistance, germplasm differentiation and quality degradation caused by small group and inbreeding. The method comprises the following steps: 1, establishing an F1-generation family; 2, cultivating the F1-generation family; 3, constructing a self-reproducing system in an F2-generation family and an F2-generation group; 4, breeding the F2-generation group by a three-stage elimination method; 5, constructing an F3-generation group and breeding by the three-stage elimination method; 6, constructing an F4-generation group and breeding by the three-stage elimination method; 7, constructing an F5-generation group and breeding by the three-stage elimination method; and 8, constructing an F6-generation group and breeding by the three-stage elimination method to finish breeding the masu salmons. The masu salmons obtained by using the method are featured with full body color, high growth speed and high postnatal survival rate.

The invention relates to the technical field of marine diesel engines, and particularly relates to a smelting method for the cylinder cover of a marine diesel engine. The smelting method comprises the following steps of: proportioning, smelting original molten iron, performing spheroidization treatment, performing primary inoculation treatment, performing secondary inoculation treatment, and pouring. During smelting, a certain amount (about 0.25%) of Mn is added, so as to ensure that the content of pearlites meets technical requirements while ensuring the strength of castings; 1.3-1.8% of T-1 type spheroidizing agent is used for performing inoculation twice, and stream inoculation is performed during the secondary inoculation, so that the spheroidization rate can be increased, the spheroidization degeneration of the castings can be prevented, and the inoculation effect can be ensured; and moreover, the T-1 type spheroidizing agent is a heavy-rare-earth ferrite type spheroidizing agent capable of effectively stabilizing ferrite, ensuring the low content of rare earth, and greatly reducing the shrinkage trend of the castings.

The invention provides a coastal saline-alkali soil ecological improvement system. The system comprises an ecological regulation pond, a culture pond, a platform field, an alkali discharge ditch and a shallow groundwater extraction system, the ecological regulation pond and the alkali discharge ditch are connected with the alkali discharge ditch and a river through ditches, the ecological regulation pond performs rainy season fresh water accumulation and individual rainy year water draining, and the culture pond performs underground water or fresh water supplementing and aquaculture. The platform field is paved with different kinds of straw according to different distances with the pond, the shallow groundwater extraction system provides power by means of blending of wind energy and solar energy to extract shallow groundwater continuously day and night. The invention further provides a matched high-yield cotton planting method. Accordingly, adversity stress of saline-alkali, drought and water logging of coastal saline-alkali soil is significantly changed, and normal growth and development of cotton are promoted; meanwhile, the pest and disease damage is significantly lowered, management is conducted more conveniently, the cotton yield is significantly increased, the cotton quality is significantly improved, and the cotton planting earnings of farmers are directly increased.

The invention provides a kind of as-cast high-strength and ductility synthetic nodular cast iron QT800-5 and a preparation method thereof. The as-cast high-strength and ductility synthetic nodular cast iron QT800-5 comprises, by mass, 3.70-3.95% of C, 3.3-3.5% of Si, less than or equal to 0.2% of Mn, less than or equal to 0.035% of P, less than or equal to 0.02% of S, 0.5-0.7% of Cu, 0.55-0.75% ofNi, 0.035-0.65% of Mg residues, and the balance Fe and microelements. The preparation method of the as-cast high-strength and ductility synthetic nodular cast iron QT800-5 comprises the following steps of mixing and smelting; alloying; pretreatment and spheroidizing; and inoculation treatment and pouring. The preparation method comprises the steps of smelting base iron melt in a medium-frequencyinduction furnace through steel scrap recarburization; adding silicon iron and cathode copper to conduct alloying; bringing in alloying elements nickel through a spheroidizing agent; conducting pretreatment, spheroidizing and inoculation treatment; and finally conducting pouring. The as-cast high-strength and ductility synthetic nodular cast iron QT800-5 prepared through the method has high strength, good ductility and toughness and excellent comprehensive performance.

The invention relates to a feed specially used for snakeheads; the feed is characterized by comprising the components in parts by weight: 24-34 parts of fish meal, 10-20 parts of soybeans, 0-10 parts of bean pulp, 5-10 parts of rapeseed meal, 2-6 parts of corn protein powder, 10-23 parts of wheat, 10-22 parts of flour, 1.5-2 parts of monocalcium phosphate, 1-4 parts of soya-bean oil and 1-2 parts of zeolite powder. The feed oil is used, so that the feed protein is saved, the input quantity of nitrogen carried by the feed material and the fish excrement for the aquatic water can be reduced, and the eutrophication of the aquatic water quality is effectively controlled.

The invention belongs to the technical field of livestock and poultry breeding, and discloses a multi-sensor data acquisition-based agricultural and pastoral intelligent analysis method, which comprises the following steps of S1, acquiring temperature, humidity and ventilation air pressure in a livestock and poultry breeding environment, and recording growth data of livestock and poultry; s2, acquiring motion image data of livestock and poultry in the breeding area, and extracting pixel coordinates of a central position of a livestock and poultry image from the motion image data of the livestock and poultry; s3, constructing and training a neural network model for predicting the growth of the livestock and poultry, inputting the data of the livestock and poultry breeding environment and the growth data related to the livestock and poultry into the neural network model, and predicting and outputting the number of days when the livestock and poultry grow to a mature state by the model; s4, mathematical analysis is conducted on the change track, represented by the time sequence data of the pixel coordinates, of the center position of the livestock and poultry, and whether the activity behavior of the livestock and poultry in the motion image is abnormal or not is judged, the time spent for the livestock and poultry to grow to the mature state can be predicted, and the abnormal behavior of the livestock and poultry can be automatically recognized.

The invention provides a flowing water type aquaculture tank, and relates to the field of aquatic product sales. The flowing water type aquaculture tank is characterized in that the front face of theinner side of a bottom tank is equidistantly provided with water pouring racks A, the top of the bottom tank is connected with a middle tank through supporting legs A equidistantly, the back face of the inner side of the middle tank is equidistantly provided with water pouring racks B, the water pouring racks A and the water pouring racks B comprise trapezoidal frames respectively, the tops of guide grooves are communicated with the surfaces of the tops of the trapezoidal frames, the front faces and back faces of the inner sides of the trapezoidal frames are provided with sloping plates respectively, the outer sides of supporting shafts are sleeved with guide wheels, the outer sides of the guide wheels are slidably connected with the inner sides of the guide grooves, the left side of the top of a top tank is connected with a mounting frame through a bracket, and the inner side of the mounting frame is provided with a water suction pump. The water pouring racks A and the water pouring racks B can make water flowing down flow to water outlet positions, and also make bred fish and shrimps swim to the positions where the water flow is high, thereby facilitating fishing of the bred fishand shrimps.

The invention discloses a machining technology of high-strength high-hardness gray pig iron, and belongs to the technical field of powder metallurgy. Q235 waste steel, Q10 pig iron and foundry returnsserve as raw materials to be subjected to gray pig iron smelting. According to the technology, the manner that when a traditional medium-frequency induction furnace smelts high-grade gray pig iron, alloying elements of copper or tin are added is replaced, manufacturing cost is reduced, and management of foundry returns is facilitated. The method that silicon carbide and furnace burden are smeltedat the same time is adopted to carry out pretreatment on the molten iron, the pretreatment effect is ensured, an efficient nucleating agent, that is a silicon zirconium nucleating agent, is adopted to ensure the nucleating effect, 80% or above of A-type graphite is obtained from a gold phase of a casting body, the tensile strength of the casting body reaches 270 to 300, and the special occasion of high performance, good cutting performance and the like at present can be met.

The invention provides a breeding task management method, a breeding task management device, breeding task management equipment and a breeding task management system. The breeding task management method comprises: acquring the real-time task performance of a bred object; Creating a breeding task corresponding to the real-time task performance; And pushing the breeding task. According to the breeding task management method, the breeding task management device, the breeding task management equipment and the breeding task management system, the corresponding breeding task is created according tothe real-time task performance of the bred object, real-time monitoring is achieved, a production manager can be reminded to deal with sudden and accidental breeding tasks in time, and therefore the breeding effect is guaranteed.

The invention discloses a novel melted iron inoculation device which comprises an installing frame arranged on a handle of a melted iron barrel, an inoculation barrel arranged on the installing frame, and a flow control device arranged below the inoculation barrel, wherein the flow control device comprises an installing joint and a switch shutter, a through hole is formed in the installing joint, the switch shutter transversely penetrates through the installing joint and disconnects the through hole, and at least one flow hole is formed in the switch shutter. According to the novel melted iron inoculation device, the accuracy in consumption can be ensured, no waste is produced, and the novel melted iron inoculation device is controlled automatically; because the flow can be randomly regulated, different inoculation manners of various materials are greatly facilitated, and a melted iron inoculation effect is effectively ensured; in a production process, compared with an original manual inoculation manner, the novel melted iron inoculation device has the advantages of remarkably improving the operation strength and the operation environment of a worker, and being safe and stable.

The embodiments of the invention relate to the field of feeding equipment and disclose a feeder, a feeding control device of the feeder and a feeding control method of the feeder. According to the feeding control device of the feeder, disclosed by the invention, the feeder comprises a containing bucket and a feeding unit. The feeding control device comprises a main control module, a range sensor,a network module and a power supply module, wherein the main control module is electrically connected with the feeding unit; the range sensor is electrically connected with the main control module, isarranged above the containing bucket and is used for detecting a spatial height between the surface of a feed in the containing bucket and the range sensor; the network module is electrically connected with the main control module; and the power supply module is electrically connected with the main control module. When the spatial height is greater than a preset height, a to-be-fed signal is sentto a remote device through the network module by the main control module; and when variance of the spatial height is smaller than preset variance in a preset duration, a to-be-serviced signal is sentto the remote device through the network module. Compared with the prior art, feed feeding conditions and the amount of the feed remaining in the containing bucket can be monitored in real time.

The invention relates to the field of metal materials, and discloses a nucleating agent for improving pearlite. The nucleating agent comprises the chemical components of, by weight, 0.49-0.51 part of silicon carbide, 0.025-0.035 part of tin, 0.025-0.035 part of antimony, 0.4-0.5 part of silicon-manganese-chrome special nucleating agent, and 0.07-0.09 part of strontium-silicon. The invention further discloses a method for improving the pearlite by the nucleating agent. The method specifically comprises the following steps that first, the silicon carbide accounting for 0.5+ / -0.01% of liquid iron is added into the surface of the liquid iron, and stirring is conducted for 3+ / -1 min, wherein the temperature of the liquid iron is 1450+ / -50 DEG C; second, 0.03+ / -0.005% of the tin, 0.03+ / -0.005% of the antimony and 0.45+ / -0.05% of the silicon-manganese-chrome special nucleating agent are added into a liquid iron transfer ladle, and the elements are transferred into a pouring ladle after being poured into the iron liquid; and third, 0.8+ / -0.01% of strontium and silicon are adopted for metal-stream inoculation in the whole process of pouring. According to the nucleating agent and the method, it is ensured that the pearlite at a thin wall is larger than 95%, and the physical property of a cylinder can be improved effectively.

The invention discloses a high-strength gray iron casting smelting method. Gray iron casting smelting is performed with scrap steel, pig iron and foundary returns as raw materials. The smelting method includes the specific steps that ferromanganese and the 10% pig iron are added into a medium-frequency induction electric furnace; then, carbon agents and the scrap steel are added at the same time; smelting is performed till the size of molten iron in the induction electric furnace is reduced by 3 / 4 through smelting; smelting is performed while silicon carbide is added, so that base iron is formed; the base iron is heated so that temperature can be raised; the induction electric furnace is adjusted to be in a heat-preservation state, and standing lasts for 5-10 minutes; and silicon and zirconium inoculant and final molten iron are punched into iron discharging ladles, and then the silicon and zirconium inoculant and the final molten iron are punched into a cast cavity so that casting can be performed. The method replaces a traditional method that alloyed elements such as copper or tin need to be added, manufacturing cost is reduced, and the foundary returns can be conveniently managed. The method that the silicon carbide and furnace burden are smelted at the same time is adopted for pre-processing the molten iron, and the pre-processing effect is guaranteed. The efficient silicon and zirconium inoculant is adopted so that the inoculation effect is guaranteed, and more than 80% of A-type graphite is obtained from the casting body metallographic phase.

The invention relates to a production process of materials suitable for diesel engine cylinder blocks and cylinder heads, and belongs to the technical field of casting. The process includes seven steps of equipment preparation, batching, feeding, melting, adjusting the chemical composition of molten iron, inoculating and pouring. The eutectic degree Sc of the diesel engine cylinder block and cylinder head material molten iron produced by the process of the present invention is controlled between 0.9-0.93, and the carbon equivalent CE is controlled between 3.95-4.1, which ensures the fluidity of molten iron and the casting process; at the same time, The maturity RG of molten iron can reach 113%, ensuring the inoculation effect, and the potential of the material itself has been fully utilized. The relative hardness RH of the prepared diesel engine cylinder block and cylinder head material can reach 0.84, and the cutting performance is excellent. This process has been applied for more than a year, and can reduce the cost of castings by 300 yuan per ton.

The invention provides a flowing water type aquaculture tank, and relates to the field of aquatic product sales. The flowing water type aquaculture tank is characterized in that the front face of theinner side of a bottom tank is equidistantly provided with water pouring racks A, the top of the bottom tank is connected with a middle tank through supporting legs A equidistantly, the back face of the inner side of the middle tank is equidistantly provided with water pouring racks B, the water pouring racks A and the water pouring racks B comprise trapezoidal frames respectively, the tops of guide grooves are communicated with the surfaces of the tops of the trapezoidal frames, the front faces and back faces of the inner sides of the trapezoidal frames are provided with sloping plates respectively, the outer sides of supporting shafts are sleeved with guide wheels, the outer sides of the guide wheels are slidably connected with the inner sides of the guide grooves, the left side of the top of a top tank is connected with a mounting frame through a bracket, and the inner side of the mounting frame is provided with a water suction pump. The water pouring racks A and the water pouring racks B can make water flowing down flow to water outlet positions, and also make bred fish and shrimps swim to the positions where the water flow is high, thereby facilitating fishing of the bred fishand shrimps.

The invention discloses a longsnout catfish culturing system capable of adjusting water temperature on the basis of temperature variation. The system includes a temperature detection unit, a water temperature detection unit, a water temperature adjusting unit and a control unit, wherein the temperature detection unit is used for detecting the temperature of the atmospheric environment, the water temperature detection unit is used for detecting the temperature T of water in a fishpond, the water temperature adjusting unit is used for adjusting the temperature of the water in the fishpond according to a command of the control unit, the control unit acquires the temperatures of the atmospheric environment at moments from t1 to tn through the water temperature detection unit and records the acquired temperatures as T1, T2, ......, Tn, and when the absolute value of a difference value between Ti and T(i-1) is greater than or equal to M, the control unit acquires the temperature T of the water in the fishpond, compares the T with a preset temperature value, and controls the water temperature adjusting unit to operate according to a comparison result command. The longsnout catfish culturing system detects and adjusts the temperature of the water in the fishpond by monitoring the temperature variation of the atmospheric environment, the timeliness and effectiveness of the detection are improved, the situation is prevented that the survival of fishes is influenced by the sudden change of the temperature of the water in the fishpond when the temperature of the atmospheric environment changes rapidly, and the effect of fish culturing is fully ensured.

The invention discloses high-strength nodular cast iron QT900-6 which consists of the following elements in percentage by weight: 3.2-3.7% of C, 2.4-2.8% of Si, less than or equal to 0.2% of Mn, less than or equal to 0.03% of P, 0.005-0.02% of S, 0.8-1.4% of Cu and the balance of Fe and unavoidable trace elements. The high-strength nodular cast iron QT900-6 has high compressive strength, high yield strength and excellent mechanical property.

According to the preparation method of the large-tonnage nodular iron casting, the number of balls is large, spheroidization is uniform, spheroidal graphite distortion is small, and the deformation amount of the casting in a casting state is small. The preparation method creatively adopts a ladle-to-ladle spheroidization to adjust the temperature so that the temperature can be controlled, and a four-time composite inoculation block technology is adopted; the number of large-tonnage ductile iron graphite nodules in a cast state is remarkably increased, and finally it can be guaranteed that the number of cast nodules is large, spheroidizing is uniform, deformity is avoided, and the mechanical property is guaranteed; meanwhile, the compacted blocky inoculant is adopted to inoculate the molten iron before and after spheroidizing, slow-release inoculation is achieved through multiple times of slow release, the molten iron fully exists in a temperature and concentration fluctuation area, and therefore the graphite nodules are numerous, round and uniform; according to the method, the spheroidal graphite can be stably obtained, the distortion is small, and the high elastic modulus can be obtained, so that the deformation of a casting in an as-cast state is reduced.

The invention discloses a high-strength fuel gas cylinder cover and a production technology thereof. The production technology comprises the following steps that step (1), furnace burdening is prepared, low-S nodular cast iron pig iron and pure carbon waste steel are selected, a medium-frequency induction electric furnace is adopted for smelting, wherein the smelting temperature is controlled to be 1500-1550 DEG C, argon is blown into molten iron, the blowing depth is 20-40% at the depth of the furnace, the blowing time is 5-8 minutes, and then the molten iron is discharged; step (2), spheroidizing and first inoculation treatment are carried out, and a pour over method is adopted; step (3), pouring and a second inoculation treatment are carried out, the pouring temperature of the molten iron is not lower than 1400 DEG C, the second inoculation is carried out by adopting a second nucleating agent during the pouring, and the second inoculation is a metal-stream instantaneous inoculation;step (4), after the pouring is completed, the waste heat of a casting is used for carrying out heat treatment until the room temperature is reached. The technology is reasonable in design, the heat treatment process of the technology is omitted, so that the production cost is reduced, environmental pollution is reduced; and the mechanical property of the fuel gas cylinder cover obtained by the technology is improved correspondingly.

The invention belongs to the technical field of aquaculture equipment, and particularly relates to a caisson device for cultivating filter feeding shellfishes. The caisson device comprises a caisson main body, an opening and closing cover is mounted at the front end of the caisson main body, side holes are formed in the inner side of the caisson main body, an inflating pipe is arranged at the inner side of the caisson main body, and an air outlet is formed in the upper end of the inflating pipe. Attachment plates are arranged at the inner side of the caisson main body, positioning holes are formed in the inner sides of the attachment plates, breeding grooves are formed in the inner sides of the attachment plates, and exchange holes are formed in the inner side of the caisson main body. Through the arrangement of the side holes, water exchange between the interior of the caisson main body and the external environment is achieved, so that circulation of the water in the caisson main bodyis ensured; through the arrangement of the exchange holes, water exchange with the external environment can be achieved, dirt produced in the growth and development process of the filter feeding shellfishes can be discharged in time, and therefore the culture effect of the filter feeding shellfishes is guaranteed.