A screening device for rotifers

Abstract

The utility model relates to the technical field of rotifer harvesting device, specifically is a kind of rotifer screening device, it includes air pump and filter basket, the filter basket be equipped with screen, the outside of filter basket is fixed with the float pipe for suspending support filter basket in water body, the top surface of filter basket is fixedly connected with water outlet elbow, the upper end of water outlet elbow extends to filter basket, the lower end of water outlet elbow extends to the lower end of filter basket outside, and air pipe connector is arranged on water outlet elbow, and the lower end of water outlet elbow is connected with the suction pipe that extends into water body, and air stone is hung in suction pipe by inflation pipe, the top end of inflation pipe is connected with air pipe connector, the bottom end of inflation pipe is connected with air stone, and air pipe connector is connected with air pump by gas transmission pipe.The rotifer screening device can automatically screen the required size of rotifer, is easy to operate, and reduces labor intensity.

Description

Technical Field

[0001] This utility model relates to the technical field of rotifer harvesting, and specifically to a rotifer screening device. Background Technology

[0002] Rotifers are tiny aquatic organisms rich in the three basic nutrients—protein, fat, and carbohydrates—as well as various amino acids, vitamins, highly unsaturated fatty acids, and other bioactive substances. Rotifers are the core natural live food source for the larvae of aquatic economic animals (fish, shrimp, and crabs) during their seedling stage, earning them the title of "cradle feed" in aquaculture. Therefore, large-scale artificial cultivation of rotifers is necessary in aquaculture hatcheries. Assuming each larva consumes 20-50 rotifers per day, a small to medium-sized hatchery producing 50 million larvae would require 1.5-2.5 billion rotifers daily. Based on a 1:1 harvest ratio, the hatchery unit would need to produce 2.5-5 billion rotifers daily. However, if the rotifers fed are of mismatched size—for example, rotifers that are too large for the larvae to consume—it significantly impacts the larvae survival rate.

[0003] Currently, most rotifer cultivation methods on the market primarily employ open, outdoor pond rearing. This method is heavily influenced by seasons, weather, and other external factors, making it difficult to control population numbers and resulting in low rotifer survival rates. Therefore, some research and production units utilize indoor, high-density rearing methods. To improve seedling rearing efficiency and survival rates, the reared rotifers of mixed sizes are graded and screened by size for precise feeding. Traditional rotifer screening uses a dip net for capture and selection. However, due to the indoor, high-density rearing method, aeration equipment needs to be installed in the rearing ponds or tanks. During the capture and selection process, the aeration equipment must be removed, making the dip net capture and selection method cumbersome. Therefore, an automatic rotifer screening device is needed. Utility Model Content

[0004] The purpose of this invention is to provide a rotifer screening device that can automatically screen rotifers of the required size for cultivation. This device is easy to operate and reduces labor intensity.

[0005] This utility model is achieved using the following technical solution: A rotifer screening device includes an air pump and a filter basket. A screen is installed inside the filter basket. A float pipe is fixed to the outside of the filter basket to suspend and support it in water. A water outlet bend is fixedly connected to the top surface of the filter basket. The upper end of the water outlet bend extends into the filter basket, and the lower end extends to the lower outer side of the filter basket. An air pipe connector is installed through the water outlet bend. A suction pipe extending into the water is connected to the lower end of the water outlet bend. An air stone is suspended inside the suction pipe via an air inflator. The top end of the air inflator is connected to the air pipe connector, and the bottom end is connected to the air stone. The air pipe connector is connected to the air pump via an air delivery pipe.

[0006] A further preferred embodiment: the floating tubes are symmetrically fixed at the front and rear ends of the outer side of the filter basket, which can stably suspend and support the filter basket in the water. The filter basket is semi-submersible, that is, the lower end of the filter basket is submerged in the water and the upper end of the filter basket is exposed above the water surface.

[0007] A further preferred embodiment: a water outlet elbow is symmetrically fixed at both ends of the filter basket, and a suction pipe is connected to the lower end of each water outlet elbow. The lower ends of two suction pipes are tied together as one unit, which improves the overall stability. The symmetrical installation of the water outlet elbows improves work efficiency and prevents the filter basket from tilting during operation.

[0008] A further preferred embodiment: the air stone is suspended and installed inside the lower end of the suction pipe. Installing the air stone inside the lower end of the suction pipe results in greater suction force, improved suction effect, and a larger water output from the outlet bend.

[0009] The rotifer screening device has an ingenious structure, using a filter basket as the main body. A float pipe is fixed to the outside of the filter basket to suspend and support it in the water. A screen is installed inside the filter basket. A water outlet bend is fixedly connected to the top surface of the filter basket, with its upper end extending into the basket and its lower end extending to the lower outer side of the basket. An air pipe connector is threaded through the water outlet bend, and its lower end connects to a suction pipe that extends into the water. An air stone is suspended inside the suction pipe via an air inflation pipe, the top of which is connected to the air pipe connector. The air pipe connector is connected to an air pump via an air supply pipe. The air pump inflates the air, and then the air stones disperse the gas in the suction pipe. Due to the pressure difference, water and rotifers in the breeding tank are drawn upwards from the bottom of the suction pipe. The air stones disperse the rotifers, and finally, the water flows out from the outlet bend into the filter basket. Rotifers larger than the mesh size of the screen are isolated in the filter basket by the screen. Workers can then collect rotifers that meet the breeding specifications from the water bucket for feeding, achieving automatic screening. The operation is simple and reduces labor intensity. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the screening device for this rotifer; Figure 2 for Figure 1 A top-view structural diagram; The component names corresponding to the serial numbers in the diagram are: 1. Air stone, 2. Air filling pipe, 3. Suction pipe, 4. Float pipe, 5. Air pipe connector, 6. Water outlet elbow, 7. Air supply pipe, 8. Air pump, 9. Filter basket, 10. Screen. Detailed Implementation

[0011] The technical solutions of the utility model will be clearly and completely described below with reference to the accompanying drawings and embodiments. The described embodiments are only a part of the utility model, and not all of the embodiments.

[0012] Example 1

[0013] A rotifer screening device includes an air pump 8 and a filter basket 9. A screen 10 is installed inside the filter basket 9. A float pipe 4 for suspending and supporting the filter basket 9 in water is fixed to the outside of the filter basket 9. A water outlet bend 6 is fixedly connected to the top surface of the filter basket 9. The upper end of the water outlet bend 6 extends into the filter basket 9, and the lower end of the water outlet bend 6 extends to the lower outer side of the filter basket 9. An air pipe connector 5 is installed through the water outlet bend 6. A suction pipe 3 that extends into the water is connected to the lower end of the water outlet bend 6. An air stone 1 is suspended in the suction pipe 3 through an air inflator 2. The top end of the air inflator 2 is connected to the air pipe connector 5, and the bottom end of the air inflator 2 is connected to the air stone 1. The air pipe connector 5 is connected to the air pump 8 through an air supply pipe 7.

[0014] The floating tubes 4 are symmetrically fixed at the front and rear ends of the outer side of the filter basket 9.

[0015] A water outlet elbow 6 is symmetrically fixed at both ends of the water filter basket 9. The lower end of each water outlet elbow 6 is connected to a suction pipe 3, and the lower ends of the two suction pipes 3 are tied together as one unit.

[0016] The air stone 1 is suspended inside the lower end of the suction pipe 3. The diameter of the air stone 1 is 1.8 cm. The suction pipe 3 is a PVC pipe with a diameter of 3.2 cm and a wall thickness of 2.4 mm. The air pump 8 is an oxygenation pump used in the rearing process.

[0017] The above description is not intended to limit the present utility model, nor is the present utility model limited to the above examples. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present utility model should be protected by the present utility model.

Claims

1. A rotifer screening device, characterized in that: The system includes an air pump (8) and a filter basket (9). A screen (10) is installed inside the filter basket (9). A float pipe (4) is fixed on the outside of the filter basket (9) to suspend and support the filter basket (9) in the water. A water outlet elbow (6) is fixedly connected to the top surface of the filter basket (9). The upper end of the water outlet elbow (6) extends into the filter basket (9), and the lower end of the water outlet elbow (6) extends to the lower end of the outer side of the filter basket (9). An air pipe connector (5) is installed on the water outlet elbow (6). A suction pipe (3) that extends into the water body is connected to the lower end of the water outlet elbow (6). An air stone (1) is suspended in the suction pipe (3) through an air inflator (2). The top end of the air inflator (2) is connected to the air pipe connector (5), and the bottom end of the air inflator (2) is connected to the air stone (1). The air pipe connector (5) is connected to the air pump (8) through an air supply pipe (7).

2. The rotifer screening device according to claim 1, characterized in that: The floating tubes (4) are symmetrically fixed at the front and rear ends of the outside of the filter basket (9).

3. The rotifer screening device according to claim 2, characterized in that: The filter basket (9) has a water outlet elbow (6) fixed symmetrically at both ends. The lower end of each water outlet elbow (6) is connected to a suction pipe (3), and the lower ends of the two suction pipes (3) are tied together as one unit.

4. The rotifer screening device according to claim 1, characterized in that: The gas stone (1) is suspended and installed inside the lower end of the suction pipe (3).

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