37 results about "Fish screen" patented technology

Water intake structures for power plants and other industrial facilities may include an inflow channel, a deep well, an outflow channel, and an intake channel. These structures include a fish screen, such as a wedge-wire screen or the like, positioned between the deep well and the intake channel to separate fish, fish larvae and fish eggs from water supplied to the intake channel from the deep well. One or more circulating or sweep flow pumps are positioned proximate an outlet of the outflow channel. The sweep flow pumps are used to maintain a sweep flow through the deep well of the intake structure to help sweep fish, fish larvae and fish eggs away from the fish screen and into the outflow channel. The screens are provided in multiple embodiments to include symmetrical shaped bars or wires, and asymmetric shaped bars or wires. One configuration of the asymmetric shaped bars or wires includes a trailing edge protrusion that creates centrifugal forces in the flow of water to enhance separation of particles from the water stream.

The invention discloses a pond bottom blowdown circulatory system. The pond bottom blowdown circulatory system comprises a pond main body, wherein at least one blowdown hole is formed in the bottom of the pond main body, the bottom of the pond main body forms a certain slope to a corresponding blowdown hole, a fish screen is arranged at the blowdown hole, the bottom of the pond main body corresponding to the blowdown hole is in a shape like the bottom of a pot, the inner bottom of the blowdown hole is of a conical structure, an eddy blocking cover is accordingly arranged above the blowdown hole in the pond main body, and the total area of gaps between the eddy blocking cover and the blowdown hole is less than or equal to the area of the blowdown hole. The pond bottom blowdown circulatory system, by virtue of structural design of the blowdown hole of the pond main body and arrangement of the eddy blocking cover above the blowdown hole, can greatly enhance capability of discharging cultivation sediments and sewage at the bottom of a pond and also effectively prevents clear water above the blowdown hole from being discharged in quantity, and discharged bottom layer sewage enters a solid-liquid separation mechanism, so that harmonious ecological balance among animals, plants and microorganisms is achieved, and water subjected to wetland treatment is recycled into a cultural pond to be utilized.

Water intake structures for power plants and other industrial facilities may include an inflow channel, a deep well, an outflow channel, and an intake channel These structures may include a fish screen, such as a wedge-wire screen or the like, positioned between the deep well and the intake channel to separate fish, fish larvae and fish eggs from water supplied to the intake channel from the deep well. These structures may further include one or more circulating or sweep flow pumps positioned proximate an outlet of the outflow channel. The sweep flow pumps may be used to maintain a sweep flow through the deep well of the intake structure to help sweep fish, fish larvae and fish eggs away from the fish screen and into the outflow channel.

The invention relates to a gas cyclone pollutant collecting culture pond system. An air inlet aerating plug flow system comprises a guide barrel. A baffle plate is fixedly arranged on the inner wall of the guide barrel through a supporting rack, a group of aerating heads are arranged behind the water inlet direction of the baffle plate and the aerating heads are connected to a Roots blower locatedout of the guide barrel through a gas conveying pipe; the water outlet of the guide barrel is formed tangentially in the side wall of the round culture pond; an upper drainage system comprises a triangular downflow weir. The triangular downflow weir is located on the upper parts around the circular culture pond, and a ring of braiding channel is arranged in a position below the triangular downflow weir of the round culture pond; a pollutant collecting pit of a bottom pollution discharge system is located at the lowest position of the center of the bottom of the round culture pond and a net fish screen is horizontally placed on the pollutant collecting pit. The system improves the collecting efficiency of feces and residual feeds in a high density fish pond, so that the pollution load of the fish pond is alleviated; the water inlet power is stable, the water flow stability in the culture pond is relatively high, turbulence is avoided, and growth of fishes in water is facilitated.

The invention relates to a dead fish collecting device for a circulating aquaculture system, and belongs to the technical field of aquaculture. The dead fish collecting device for the circulating aquaculture system is characterized in that a fish screen (4) is arranged at a water outlet at the bottom of a fishpond (1); a pneumatic means is arranged below the fish screen (4); the pneumatic means is a pneumatic pipe connecting the fish screen (4) and the outside; a first air cylinder (5) internally provided with a first piston (6) is arranged at the end, close to the fish screen (4), of the pneumatic pipe; a second air cylinder (9) internally provided with a second piston (8) is arranged at the end, close to outside, of the pneumatic pipe; the first piston (6) is fixedly connected to the fish screen (4); when a user push or pull the second piston (8), the first piston (6) can be driven to upwardly jack the fish screen (4) or downwardly pull the fish screen (4) for reset; and dead fishes flow out from a circulating water channel below the fish screen (4) when the fish screen (4) is upwardly jacked.

The invention relates to an adjustable fish screen. The adjustable fish screen is characterized by comprising a frame and rotary pieces; the frame is rectangular, two opposite side frames of the frame are respectively provided with a plurality of small holes which are symmetrical in position; each rotary piece is rectangular, the middle portions of the two ends of each rotary piece are provided with screws, the rotary pieces are arranged in the frame in parallel and side by side, the screws at the two ends of each rotary piece are arranged in the corresponding small holes of the two side frames of the frame in a penetrating mode, and each screw is provided with a locking nut in a matched mode. The adjustable fish screen is simple in structure, simple and easy to operate, low in cost, and capable of effectively separating large fishes and small fishes in a fish catching process, avoids resource waste caused by manufacturing of fish screens of different standards, lowers labor consumption in a process that the fish screen is disassembled and bundled in a net cage, and is an innovation of the fish screen manufacturing technique.

The invention discloses a fish screening machine. According to the fish screening machine, the outlet of a lifting belt is in butt joint with the inlet of a screening roller, a fish tank is arranged below the outlet channel of the screening roller, a fresh fish is lifted to the screening roller through the lifting belt, an inclined outlet channel is used for screening various rich fresh fish fromsmall to large in size sequentially, the purpose of grading screening is achieved, automatic sorting is achieved, the operation speed is improved, the classification precision is high, and the commodity selling point is improved.

Debris adhering to the outer surface of a barrel-type fish screen is cleared by air bursts from a series of perforated air pipes positioned inside the outer foraminous shell of the screen, the perforations being holes with axes at an acute angle to the screen radius for efficient use of the air. Separately, the conical water collection manifold mounted inside the shell is open at its narrow end, with a valve mounted to that open end to control the opening. The opening prevents reduced water inflow at that end of the manifold, and the valve adjusts the access of the surrounding water to the opening, thereby allowing the manifold to be tuned to more closely approach a uniform distribution of axial water flow along the length of the collection manifold for different ambient conditions. Webs joining the air pipes to the collection manifold are also included in certain embodiments of the invention to support increased lengths of the entire apparatus without loss of structural integrity, including support for the foraminous shell.

The invention belongs to the technical field of aquaculture, and discloses a running water fish culture tank, shrimp and crab serial circulating aquaculture system and method. Fishes are cultured in aplurality of parallel running water culture tanks arranged on a ridge, microporous aeration devices are arranged at the bottoms of the running water culture tanks, and fish screens are arranged at the two ends of each running water culture tank; an airlift-type aeration water push machine is installed on the upstream of the running water culture tanks, and a sewage collection pond is arranged onthe downstream of the running water culture tanks; a plurality of conical sewage collection hoppers are arranged at the bottom of the sewage collection pond; an artificial floating bed is placed at the tail end of the sewage collection pond; fishes are cultured and aquatic plants are planted in an artificial wetland purification area formed in the downstream of the sewage collection pond; the rearend of the sewage collection pond is communicated with a shrimp pond; a crab pond is adjacent to the shrimp pond, and aquatic plants grow in the shrimp pond and the crab pond; snails are put into a purified water reutilization area at the rear end of the crab pond. By means of the running water fish culture tank, shrimp and crab serial circulating aquaculture system and method, reutilization of water resources is realized, and the effect of zero emission is achieved; besides, several kinds of aquatic products are cultured in the system at the same time, and thus the economic benefit of culture is increased.

The invention discloses a preparation method for a transparent elastic fish screen shoe cloth and products and application of the transparent elastic fish screen shoe cloth. The preparation method comprises the following steps of (1) preparation of raw materials; (2) slicing; (3) spinning; (4) rolling; (5) weaving; (6) shaping. The provided transparent elastic fish screen cloth is obtained by weaving and adopting an elastic fish screen, wherein the elastic fish screen is prepared by reasonably setting the mass ratio of polyester to spandex to TPU. Compared with traditional elastic fish screens, the elastic fish screen has the advantages of higher elasticity, better tensile resistance, better bending resistance, good flexibility, high air permeability and a great transparency effect. The provided transparent elastic fish screen cloth can be applied to shoe cloth materials; compared with traditional textile shoe uppers, the transparent elastic fish screen shoe cloth has the advantages that the elasticity and tensile resistance are higher, the flexibility and bending resistance are good, the service life is long, the air permeability is great at the same time, the comfort of shoes canbe effectively improved, a transparent effect is achieved, the appearance is novel, the demands of contemporary people for beauty and individuality can be met, and widespread application and popularization are facilitated.

The invention provides a dam body device for treatment of an urban artificial watercourse. The dam body device comprises a first dam body, a first plugging device, an aquatic plant planting zone and a blocking device, wherein the first dam body extends in the width direction of the urban artificial watercourse; the lower part of the first dam body is provided with a first drainage channel; the side surface, facing the downstream part of the urban artificial watercourse, of the first dam body is a slope surface; a plurality of first salient points are arranged on the slope surface; the first plugging device is arranged to conduct or cut off the first drainage channel; the aquatic plant planting zone is arranged at the downstream part of the first dam body; the aquatic plant planting zone is arranged for planting aquatic plants; the blocking device is arranged at the downstream part of the aquatic plant planting zone, and is provided with at least one blocking unit; and the blocking units are provided with first fish screens, activated carbon fiber filter cloth, chitosan fiber filter cloth and second fish screens which are sequentially arranged in the water flowing direction. The dam body device is simple in structure, can isolate algae floating objects like blue-green algae in a water body, can block and remove parts of organic substances and heavy metals, and has an excellent treatment effect.

The invention discloses a fish screening device for a fish lift. The fish screening device comprises a sorting tank (1), the head portion of the sorting tank (1) is provided with a two-stage sorting chamber, a primary sorting chamber is internally provided with a fine screen (2), and a secondary sorting chamber is provided with a rough screen (3); a sorting recognition device (4) is arranged in the middle of the sorting tank (1), and the tail portion of the sorting tank (1) is connected with a group of temporary aquaculture tanks (7) through a group of communication pipes (6); communication gate valves (5) are arranged in middles of the communication pipes (6), fish driving screens (8) are arranged in the temporary aquaculture tanks (7), and discharging gate valves (9) are arranged at inlets of discharging pipes (10) which are arranged at bottoms of the temporary aquaculture tanks (7). By the screens for sorting adult fishes, mildness and low fry damages are realized, the sorting recognition device (4) is accurate in fish screening, optimal living environments can be provided for different types of fishes through the temporary aquaculture tanks, and the whole fish screening deviceis high in fish fry screening efficiency.

The invention discloses a fish, vegetable and shellfish symbiotic engineering circulating water double-layer culture tank, and belongs to the technical field of aquaculture equipment. The fish, vegetable and shellfish symbiotic engineering circulating water double-layer culture tank comprises a tank body, a floating bed, a bottom fish screen and other structures, the floating bed is located at the top of the water outlet end of the tank body and provided with a plurality of planting holes, aquatic plants are planted in the floating bed, the interior of the tank body is divided into two parts which are deep in the upper portion and shallow in the lower portion through the bottom fish screen, fishes are cultured in the upper tank body, and filter-feeding shellfishes are put in the lower tank body. Through the root systems of the aquatic plants, COD, nitrogen, phosphorus and other nutritive salts in aquaculture water can be effectively absorbed, sedimentation of suspended particulate matter in the water is promoted, meanwhile, granular organic matter is removed through the filter feeding effect of the bottom shellfishes, the problem that an existing aquaculture water tank is low in waste collection efficiency is solved, the yield of the shellfishes and the aquatic plants can be increased, and meanwhile, the landscape aesthetics value is realized.

The invention discloses a runway breeding method of ictalurus punetaus. According to the runway breeding method, 4-8 breeding launders are built side by side in the middle of a pond through cement pouring; two ends of each launder are blocked by fish screens; a water-driving oxygenation area is arranged outside one side of each fish screen; pond water is pushed to form high-dissolved-oxygen water flow to enter the launders by utilizing a water-driving oxygenation device; and a sewage suction water channel is arranged outside the other side of each fish screen, breeding excrement and residues are discharged through a waste and excrement collection device, and during the breeding period of channel catfish, the water flow speed of the launder is controlled through a water-driving device on juvenile fish and adult fish and different time periods. The runway breeding method of ictalurus punetaus can realize high-density and high-quality breeding of the ictalurus punetaus, can avoid the complex ex-situ purification circulation process of a breeding water body, can realize a large amount of movement of the ictalurus punetaus during breeding so as to improve the feed utilization and reduce manual management cost, and can remarkably improve the economic and environmental benefits of ictalurus punetaus breeding.

The invention discloses a fish inlet structure for a fish passing facility and belongs to the field of hydropower engineering. The fish inlet structure which is capable of luring fish in multiple directions and used for the fish passing facility is provided and structurally comprises a cylindrical shell. A cylindrical fish screen is arranged in the shell. An annular fish passing path is formed between the cylindrical fish screen and the shell. A separation fish screen for separating the fish passing path is arranged in the fish passing path. One end of the fish passing path separated by the fish screen penetrates the shell and then communicates with the fish passing facility. Multiple fish inlets are formed in the peripheral direction of the shell at intervals. A stirring mechanism is arranged in the cylindrical fish screen. According to the fish inlet structure for the fish passing facility, the fish inlets distributed in the peripheral direction of the shell are formed, meanwhile water flow generated by stirring of the stirring mechanism can flow along the annular fish passing path, suction water flow in the fish inlet direction is formed at each fish inlet, and multi-direction fish luring is achieved at the same time in the peripheral direction of the shell.

The invention relates to an anti-seasonal reproduction method of crucian carp. The reproduction of crucian carp in winter includes the following steps: (1) disinfecting a temporary culture pond and ahatching tool; (2) preparing a parent fish culture pond; (3) parent fish and breeding thereof; (4) putting parent fish in the pond for temporary culture according to a male-to-female ratio and corresponding parent fish screening criteria; (5) spawning induction; and (6) fertilization and hatching. The reproduction of crucian carp in summer includes the following steps: (1) disinfecting a temporaryculture pond and a hatching tool; (2) parent fish and breeding thereof; (3) putting parent fish in the pond according to a male-to-female ratio; (4) spawning induction; and (5) fertilization and hatching. Different reproduction methods are set for different seasons, the water temperature is adjusted reasonably, and the proportion of oxytocic is set creatively. Thus, the parent fish are in a physiological state of normal ovulation or spermiation, and the vitality of reproductive cells is improved. Through the innovation of the breeding mode and the screening criteria, the problem of egg agingof female fish is solved.

The invention discloses a vibratory fish screening machine which comprises a rack body, a vibrating table and a vibrator, wherein the vibrating table is elastically connected with the rack body through springs; the springs are capable of effectively absorbing vibrations from the vibrating table and preventing the vibrations from being transferred to the rack body; the vibrator is fixedly connectedwith the bottom of the vibrating table through a connecting frame; a U-shaped material trough serves as an inner cavity of the vibrating table; a to-be-cleaned fish is placed in the material trough;a plurality of water filtering holes are formed in the bottom of the material trough, so that smudgy impurities can conveniently flow out through the water filtering holes; a magnet is hung at the upper part of the material trough and used for attracting scrap iron and other metal impurities in a fish product; and a square tapered hopper is arranged at the lower part of the vibrating table, used for collecting sewage and impurities, and fixedly connected with the rack body. The vibratory fish screening machine disclosed by the invention is simple in structure, convenient to operate, and capable of effectively removing the impurities and scrap iron in the fish product.

The invention discloses a fish fry screening system and method. The fish fry screening system comprises fish screening ponds, wherein the fish screening ponds are used for loading fish fries needing to be screened, and a fish containing box is arranged on one side of each fish screening pond and used for containing the screened fish fries; the fish screening ponds and the fish containing boxes are matched one by one to form a fish screening mechanism, and the fish screening mechanism has multiple stages and extends from top to bottom in a step shape; the fish screening pond and the fish containing box of each stage of fish screening mechanism communicate through a connecting channel, an electric valve is arranged in the connecting channel, the input of the electric valve is connected with a controller, and the controller is used for controlling the opening degree of the electric valve so as to connect or disconnect the fish screening pond and the fish containing box; and a water inlet pipe communicating with the topmost stage of fish screening pond is arranged on the topmost stage of fish screening pond and used for injecting water into the corresponding fish screening pond, and a rotary vane device is erected at the end, opposite to the corresponding fish containing box, in each stage of fish screening pond and used for driving the fish fries to swim towards the corresponding fish containing box. The fish fry screening efficiency and the fish fry survival rate can be effectively increased, and damage to the fish fries is small.