A device for screening and catching coilia nasus fry

Abstract

The utility model discloses a kind of knife herring seedling screening fishing equipment, belong to the technical field of fry screening fishing, sieve body and handle, handle is equipped on sieve body, sieve body includes inner sieve and shell, shell is hemispherical shell structure and is equipped with discharge gap in bottom center, inner sieve is circular arc piece structure and left and right ends are respectively rotationally connected on the rotation connecting block of shell left and right ends, inner sieve bottom center is equipped with the fine sieve area of several fine sieve holes, the front and rear sides of fine sieve area are respectively equipped with the coarse sieve area of several coarse sieve holes and the middle sieve area of several middle sieve holes.The utility model improves sieve body to include inner sieve and shell, inner sieve is provided with three specifications of sieve hole, can form three different specifications of screening mode, can realize three specifications of screening action in one screening process, reduces the action of twice fishing to lift knife herring seedling, help to reduce the stress reaction of knife herring seedling.

Description

Technical Field

[0001] This utility model belongs to the technical field of fish fry screening and harvesting, and in particular relates to a screening and harvesting device for anchovy fry. Background Technology

[0002] Coilia ectenes fry are highly susceptible to death due to stress during screening, so the number of screenings should be reduced. However, in order to screen fry with different growth rates according to individual size, multiple screenings are necessary. This requires balancing the number of screenings and the screening effect. Traditional operation requires careful and repeated operation with a fry sieve, which is quite laborious. In order to improve screening efficiency and reduce the stress response of Coilia ectenes fry, we have specially improved the fry sieve, which can achieve screening of multiple sizes in one screening process. Summary of the Invention

[0003] To overcome the technical problems described in the background section, this utility model provides a screening and harvesting device for Coilia ectenes seedlings. The screen body is improved to include an inner screen and an outer shell. The inner screen is equipped with three sizes of screen holes, which can form three different screening modes. The screening can be carried out in one screening process, reducing the need for two separate actions to catch and scoop up the Coilia ectenes seedlings, and helping to reduce the stress response of the seedlings.

[0004] The technical solution of this utility model is as follows: a screening and harvesting device for anchovy seedlings, comprising a screen body and a handle. The screen body is provided with a handle. The screen body includes an inner screen and an outer shell. The outer shell has a hemispherical shell structure and a discharge opening in the center of the bottom. The inner screen has an arc-shaped sheet structure and its left and right ends are respectively rotatably connected to the rotating blocks at the left and right ends of the outer shell. The bottom center of the inner screen is provided with a fine screen area composed of several fine screen holes. The front and rear sides of the fine screen area are respectively provided with a coarse screen area composed of several coarse screen holes and a medium screen area composed of several medium screen holes.

[0005] Furthermore, the inner screen and the outer shell are respectively provided with an inner end block and an outer end block at the end connection. Bolts are transversely inserted on the corresponding inner end block and outer end block on the same side, and the bolt threads are nested with locking blocks that lock the inner end block and the outer end block respectively.

[0006] Furthermore, the inner diameters of the fine sieve holes, medium sieve holes, and coarse sieve holes increase sequentially from small to large.

[0007] Furthermore, the discharge opening, under its natural state, exposes the fine screening area, which is located between the coarse screening area and the medium screening area.

[0008] Furthermore, the end of the inner block is provided with a hexagonal hole, and the countersunk head of the bolt is inserted into the corresponding hexagonal hole of the inner block.

[0009] The beneficial effects of this invention, due to the adoption of the above-mentioned technology, are as follows: the sieve body is improved to include an inner sieve and an outer shell. The inner sieve is equipped with three sizes of sieve holes, and the outer shell is a hemispherical shell structure with a discharge opening at the bottom. By moving the inner sieve to expose the sieve hole area of ​​the discharge opening at the bottom of the outer shell, different sizes of sieve action are realized. It is possible to realize three sizes of sieve action in one sieve process, which avoids and greatly reduces the loss of anchovy fry caused by stress and death due to the need to use different sizes of sieves for multiple catching and sieving when using conventional fry sieves. It can effectively improve the survival rate of anchovy fry after catching and sieving. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the structure of the present invention.

[0011] Figure 2 This is the left view of the present invention.

[0012] Figure 3 This is a schematic diagram of the structure of the present invention viewed from the side and from below.

[0013] Figure 4 This is a top view of the present invention.

[0014] Figure 5 This is an exploded structural diagram of the present invention.

[0015] In the diagram: 1. Handle, 2. Inner screen, 3. Outer shell, 4. Middle screen hole, 5. Locking block, 6. Stud, 7. Fine screen hole, 8. Discharge notch, 9. Coarse screen hole, 10. End inner block, 11. Hexagonal block, 12. End outer block. Detailed Implementation

[0016] Example 1: As Figures 1-5 As shown, this utility model provides a screening and harvesting device for anchovy seedlings, including a screen body and a handle. The screen body is provided with a handle 1 for lifting. The handle 1 has end blocks 12 at both ends and spans the top of the outer shell 3. The screen body includes an inner screen 2 and an outer shell 3. The outer shell 3 has a hemispherical shell structure and a discharge opening 8 at the center of the bottom. The inner screen 2 has an arc-shaped sheet structure and its left and right ends are rotatably connected to the rotating blocks at the left and right ends of the outer shell 3. The inner screen 2 has a coarse screening area, a fine screening area and a medium screening area arranged sequentially around the axis of rotation with the outer shell 3. The bottom center of the inner screen 2 has a fine screening area composed of several fine screening holes 7. The front and rear sides of the fine screening area are respectively provided with a coarse screening area composed of several coarse screening holes 9 and a medium screening area composed of several medium screening holes 4. The inner diameters of the fine screening holes 7, medium screening holes 4 and coarse screening holes 9 increase sequentially.

[0017] In order to form a rotating connection between the inner screen 2 and the outer shell 3, realize the offset adjustment between the inner screen 2 and the outer shell 3, and complete the switching of the screening mode, an inner end block 10 and an outer end block 12 are respectively provided at the end connection of the inner screen 2 and the outer shell 3. Bolts are transversely inserted on the corresponding inner end block 10 and outer end block 12 on the same side, and the bolt threads are nested with locking blocks 5 that lock the inner end block 10 and outer end block 12 respectively.

[0018] To facilitate locking the inner screen 2 and the outer shell 3, a hexagonal hole is provided at the end of the inner block 10. The countersunk head of the hexagonal block 11 of the bolt is inserted into the corresponding hexagonal hole of the inner block 10. In this way, the bolt stud 6 acts as a pivot and the hexagonal block 11 end cannot rotate. By rotating the locking block 5, the inner block 10 and the outer block 12 can be loosened or locked, preventing the inner screen 2 and the outer shell 3 from being too loose, which would cause the screen to automatically reset to the fine screen mode under its own weight when adjusted to the medium screen mode or coarse screen mode.

[0019] In use, the discharge opening 8, in its natural state, exposes the fine screening area between the coarse and medium screening areas, thus entering fine screening mode. Fine screening is performed first to separate smaller anchovy fry. Then, the inner screen 2 is pulled and moved to one side, causing it to misalign with the outer shell 3, exposing the medium screening area to the discharge opening 8. The system is then switched to medium screening mode to separate medium-sized anchovy fry. Finally, the system returns to fine screening mode, and the inner screen 2 is pulled and moved to one side again, causing it to misalign with the outer shell 3, exposing the coarse screening area to the discharge opening 8. The system is then switched to coarse screening mode to separate larger anchovy fry. This allows for sequential fine, medium, and coarse screening after each catch of anchovy fry, avoiding the need for multiple screenings using different sized fry sieves as in traditional methods. This significantly reduces stress on the anchovy fry and improves screening efficiency.

Claims

1. A screening and harvesting device for anchovy seedlings, comprising a screen body and a handle, wherein the screen body is provided with a handle, characterized in that: The sieve body includes an inner sieve (2) and an outer shell (3). The outer shell (3) has a hemispherical shell structure and a discharge opening (8) in the center of the bottom. The inner sieve (2) has an arc-shaped sheet structure and its left and right ends are respectively rotatably connected to the rotating blocks at the left and right ends of the outer shell (3). The inner sieve (2) has a fine sieve area composed of several fine sieve holes (7) in the center of the bottom. The front and rear sides of the fine sieve area are respectively composed of a coarse sieve area composed of several coarse sieve holes (9) and a medium sieve area composed of several medium sieve holes (4).

2. The screening and harvesting equipment for *Anchovy* seedlings according to claim 1, characterized in that: The inner screen (2) and the outer shell (3) are respectively provided with an inner end block (10) and an outer end block (12) at the end connection. Bolts are transversely inserted on the inner end block (10) and the outer end block (12) on the same side. The bolts are threaded with locking blocks (5) that lock the inner end block (10) and the outer end block (12) respectively.

3. The screening and harvesting equipment for *Anchovy* seedlings according to claim 2, characterized in that: The inner diameters of the fine sieve hole (7), the medium sieve hole (4), and the coarse sieve hole (9) increase sequentially from small to large.

4. The screening and harvesting equipment for *Anchovy* seedlings according to claim 3, characterized in that: The discharge opening (8) exposes the fine sieve area between the coarse sieve area and the medium sieve area in its natural state.

5. The screening and harvesting equipment for *Anchovy* seedlings according to claim 4, characterized in that: The end of the inner block (10) is provided with a hexagonal hole, and the hexagonal block (11) of the bolt is countersunk into the corresponding hexagonal hole of the inner block (10).

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