Automatic grading device for fish fries

Abstract

The automatic grading device comprises a multi-stage channel, and a water inlet and a water outlet are formed in the two ends, in the circulation direction, of the multi-stage channel respectively; the multi-stage channel comprises a plurality of channels arranged side by side, the two ends of each channel are open, communicated fish collecting ponds are arranged between the adjacent channels in the circulation direction, filtering pieces are arranged on the side faces, corresponding to the tail ends of the two channels, of the fish collecting ponds, and filtering holes of the multiple filtering pieces are sequentially enlarged in the circulation direction. Fish passing openings which are communicated with one another are formed between the adjacent channels and are positioned on one side close to the fish collecting pond. By means of the arrangement, the device can classify fry of different specifications at a time, and therefore the device has high efficiency and a good application scene.

Description

Technical Field

[0001] This invention belongs to the technical field of fish fry grading technology, specifically relating to an automatic fish fry grading device. Background Technology

[0002] In aquaculture, grading fish fry is a routine operation. Fish fry of different sizes are graded through a sieve and placed into different fish ponds to ensure that the fish fry are of uniform size. In traditional operations, grading fish fry is mainly done manually, which is time-consuming, labor-intensive and inefficient. Sometimes, it can also cause stress to the fish.

[0003] Currently, there is no device capable of grading fish fry of different sizes in one go, so there is room for improvement. Summary of the Invention

[0004] In order to overcome the shortcomings of the prior art, the purpose of this invention is to provide an automatic grading device for fish fry, which can grade fish fry of different sizes in one go, thus having high efficiency and good application scenarios.

[0005] The objective of this invention is achieved through the following technical solution:

[0006] An automatic grading device for fish fry includes a multi-stage channel, with an inlet and an outlet at each end along the flow direction. The multi-stage channel comprises several parallel channels, each with an opening at both ends. A connected fish collection pool is provided between adjacent channels along the flow direction. Filter elements are provided on the sides of the fish collection pools corresponding to the ends of two channels, with the filter holes of the filter elements progressively enlarging along the flow direction. A connected fish passage is provided between adjacent channels, located on the side closest to the fish collection pool.

[0007] Furthermore, corresponding to the same fish collection pond, the filter element includes a grid, which is disposed at the end of the preceding channel along the flow direction; within the multi-stage channel, the size of the grid openings of the plurality of grids increases sequentially along the flow direction.

[0008] Furthermore, corresponding to the same fish collection pond, the filter element also includes a return water inlet with a filter screen, the return water inlet being located at the front end of the next channel along the flow direction, the mesh size of the filter screen being smaller than the mesh size of the grille; within the multi-stage channel.

[0009] Furthermore, the lengths of several of the channels decrease sequentially along the flow direction.

[0010] Furthermore, the channel is rectangular.

[0011] Furthermore, the channel is made of PVC plastic or glass.

[0012] The present invention has the following beneficial effects:

[0013] This invention establishes fish collection ponds and fish passages between the ends of adjacent channels within a multi-stage channel system. Under the impact of water flow, smaller fish fry can swim downstream through the filter elements into the collection ponds, while larger fry pass through the fish passages into the next filter element for further grading, thus separating fry of different sizes. The filter elements, with progressively enlarging pores along the flow direction, collect fry of different sizes in each collection pond, achieving automatic fry grading and improving grading efficiency. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0015] In the diagram: 1. Multi-stage channel; 11. Inlet; 12. Outlet; 13. Filter screen; 2. Channel; 3. Filter element; 31. Grille; 32. Return outlet; 33. Filter screen; 4. Fish collection pond; 5. Fish passage. Detailed Implementation

[0016] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. Terms such as “upper,” “inner,” “middle,” “left,” “right,” and “one” used in this specification are merely for clarity of description and are not intended to limit the scope of the invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention.

[0017] The automatic fish fry grading device provided by this invention can grade fish fry of different sizes in one go, with high efficiency and good application scenarios. The structure of the automatic fish fry grading device is further described below:

[0018] An automatic grading device for fish fry, such as Figure 1 As shown, it includes a multi-stage channel 1. The multi-stage channel 1 has an inlet 11 and an outlet 12 at both ends along the flow direction. The outlet 12 is also equipped with a filter screen 13. Therefore, after the fish fry and their breeding water are discharged from the inlet 11, the fish fry are graded by the multi-stage channel 1 and finally separated from the outlet 12. The largest fish fry are collected in the multi-stage channel 1 for easy manual collection.

[0019] The multi-stage channel 1 includes several parallel channels 2, each channel 2 being rectangular strips made of PVC plastic or glass, which is easy to process and mold. Both ends of each channel 2 are open. A fish collection pool 4 is located between adjacent channels 2 along the flow direction, and the fish collection pool 4 is connected to the two adjacent channels 2. Filter elements 3 are installed on the sides of the fish collection pool 4 corresponding to the ends of the two channels 2. The filter elements 3 are used to allow fish fry of a specific size to pass through and be collected in the fish collection pool 4. The filter holes of several filter elements 3 gradually enlarge along the flow direction, so the fish collection pool 4 closest to the opening along the flow direction can collect larger fish fry. A connecting fish passage 5 is provided between adjacent channels 2, located on the side closest to the fish collection pool 4. Therefore, if fish fry cannot pass through the filter elements 3 to enter the fish collection pool 4, they will enter the next channel 2 through the fish passage 5.

[0020] It can be seen that by setting up a fish collection pool 4 and a fish passage 5 between the ends of adjacent channels 2 in the multi-stage channel 1, small-sized fish fry can swim downstream through the filter element 3 into the fish collection pool 4 under the impact of water flow, while larger-sized fish fry are further discharged into the next filter element 3 through the fish passage 5 for the next level of screening, so as to separate the fish fry of the next size. Thus, the filter element 3 with progressively larger filter holes along the flow direction can collect fish fry of different sizes in each fish collection pool 4, realize the automatic grading of fish fry, and improve the grading efficiency.

[0021] In this embodiment, to ensure that smaller fish fry are screened onto the filter element 3 with filter holes as they flow with the water, and to reduce the backflow of fish from the fish collection pond 4 into the channel 2, the filter element 3 includes a grid 31 and a grid 31 with a filter screen 33 for the same fish collection pond 4. The grid 31 is located at the end of the preceding channel 2 along the flow direction, and the return water outlet is located at the front end of the following channel 2 along the flow direction. The mesh size of the filter screen 33 is smaller than the mesh size of the grid 31. In the multi-stage channel 1, the mesh size of several grids 31 increases sequentially along the flow direction.

[0022] Therefore, as the fish fry flow downstream through the front grille 31, smaller fry can enter the corresponding collection pond 4 through the grille opening. Simultaneously, the water in the collection pond 4 can flow back into the channel 2 through the return port 32 and filter screen 33, with the filter screen 33 preventing the fry from flowing back into the channel 2. Meanwhile, larger fry will enter the next channel 2 through the fish inlet 5 and flow downstream through the next grille 31, thus entering the next round of fry size screening. This process continues until all fry are automatically graded, offering advantages such as high grading efficiency and wide applicability.

[0023] It should be noted that the water flow in the fish collection pond 4 will also form a certain water flow due to the setting of the grid 31 and the return port 32. This water flow will cause the fish fry to concentrate on the side near the return port 32, which helps to reduce the fish fry returning to the channel 2 through the grid 31.

[0024] In this invention, as the fish fry pass through several channels 2 in sequence with the flow, they are screened and graded according to their size by passing through several grids 31 in sequence. Therefore, the number of fish fry moving on the channel 2 gradually decreases in the flow direction. Thus, by designing the length of several channels 2 to decrease sequentially along the flow direction, the advantage of cost saving can be achieved.

[0025] When the automatic fish fry grading device of the present invention is applied in practical use, the following process exists:

[0026] 1. Place the ungraded fish fry into the multi-stage channel 1 along with the flowing water from the inlet 11;

[0027] 2. When the fish reach the end of the first channel 2 (first channel 2), the smaller fish fry can enter the fish collection pond 4 through the grille 31. The larger fish fry cannot pass through and enter the next channel 2 (second channel 2) through the fish passage 5 on the side. At the same time, the water entering the fish collection pond 4 can flow into the next channel 2 through the return water outlet. Because of the filter screen 33, the fish fry that have entered the fish collection pond 4 cannot return to the raceway. The smaller fish fry that have been separated can be manually retrieved.

[0028] 3. Similarly, when the fish reach the end of the second channel 2, the medium-sized fry enter the fish collection pond 4 through the grille 31, while the large-sized fish enter the next third channel 2 through the fish inlet 5. The water in the fish collection pond 4 also flows back into the channel 2 through the return water inlet with filter screen 33.

[0029] 4. The third section of the raceway ends at an outlet 12 with a filter screen 33. Water flows out from the outlet 12. Larger fish can be manually scooped out from the third section of the raceway, thus dividing the same batch of fish into three grades. The number of raceways can be increased or decreased as needed.

[0030] The embodiments of the present invention are not limited thereto. Based on the above description of the present invention, and using common technical knowledge and conventional means in the field, the present invention can be modified, replaced or combined in various other forms without departing from the basic technical idea of ​​the present invention, and all such modifications, replacements or combinations fall within the scope of protection of the present invention.

Claims

1. An automatic grading device for fry, characterized by The multi-stage channel comprises a water inlet and a water outlet arranged at two ends of the flow direction respectively, and comprises a plurality of channels arranged side by side, both ends of the channel are arranged in an open manner, a fish collecting pool is arranged between adjacent channels in the flow direction and is connected, a filter is arranged on the side of the two ends of the channel corresponding to the fish collecting pool, and the filter holes of a plurality of filters gradually increase in size along the flow direction, and a fish passing opening is arranged between adjacent channels and is connected, and the fish passing opening is located on the side close to the fish collecting pool.

2. The automatic grading apparatus for fish fry according to claim 1, wherein Corresponding to the same fish collecting pool, the filter comprises a grid, and the grid is arranged at the end of the previous channel in the flow direction; in the multi-stage channel, the grid openings of a plurality of grids gradually increase in size along the flow direction.

3. The automatic grading apparatus for fish fry according to claim 2, wherein Corresponding to the same fish collecting pool, the filter further comprises a water return opening with a filter screen, the water return opening is arranged at the front end of the subsequent channel in the flow direction, and the size of the screen opening of the filter screen is smaller than that of the grid opening of the grid.

4. The automatic grading apparatus for fish fry according to claim 1, wherein The lengths of the plurality of channels gradually decrease along the flow direction.

5. The automatic grading device for fish fry according to claim 1, wherein The channel is rectangular.

6. The automatic grading apparatus for fish fry according to claim 1, wherein The channel is made of PVC plastic or glass material.

Images