A screening device for the size of snakehead fry

Abstract

This utility model relates to the field of aquaculture equipment, specifically a screening device for snakehead fry of different sizes. It includes two boxes, each with a placement cavity extending through the front wall and connected to the outside. A fish-collecting drawer is located within the placement cavity, with a water inlet pipe above it. One end of the water inlet pipe extends into the fish-collecting drawer, and the other end connects to an external water pump. An oxygenation tray is installed on the bottom of the fish-collecting drawer, connected to an oxygenation hose. An aerator is fixedly installed on the rear wall of the box, with the end of the oxygenation hose furthest from the oxygenation tray connected to the aerator. A screening screen is positioned above the placement cavity, with a reinforcing edge fixedly connected to its top. Compared to existing technologies, this patent, by incorporating a slidable and detachable screening screen and its limiting components, enables rapid replacement and securing of the screen, adapting to the screening needs of fry of different sizes and improving the versatility and ease of operation of the equipment.

Description

Technical Field

[0001] This utility model relates to the field of aquaculture equipment, specifically a screening device for the size of snakehead seedlings. Background Technology

[0002] During the cultivation of snakehead fry, differences in growth rate lead to variations in individual size. To ensure farming efficiency and fry quality, sorting according to size is necessary. Traditional manual sorting methods are not only labor-intensive but also prone to causing mechanical damage to the fish, affecting survival rates. Therefore, a highly efficient and low-damage mechanized sorting device is needed to solve this problem.

[0003] Existing fry sorting devices for snakehead breeding use a multi-stage screen structure to grade fry by size and utilize floats to allow the device to float in the breeding pond, reducing fry stress when out of water.

[0004] The existing screening devices have the following drawbacks during operation: (1) The multi-stage screen is fixed and cannot flexibly adjust the screen size or replace the screen, making it difficult to adapt to the screening needs of different growth stages or different species of fish fry. (2) The screening process relies on the weight of the fish fry or their passive swimming, resulting in low screening efficiency. Furthermore, the sieve holes may become clogged due to the aggregation of fish fry, affecting the accuracy of sorting. Utility Model Content

[0005] This utility model aims to provide a screening device for the size of snakehead fry, mainly to solve the technical problems of existing technologies that cannot flexibly adjust the screen size or replace the screen, making it difficult to adapt to the screening needs of fish fry at different growth stages or of different species.

[0006] To solve the above-mentioned technical problems, this utility model provides the following technical solution: A screening device for determining the size of snakehead fry includes two boxes. Each box has a placement cavity extending through its front wall and communicating with the outside. A fish-collecting drawer is located within each placement cavity. A water inlet pipe is positioned above the fish-collecting drawer, with one end extending into the drawer and the other end connected to an external water pump. An oxygenation disc is installed on the bottom surface of the fish-collecting drawer, connected to an oxygenation hose. An aerator is fixedly installed on the rear wall of the box, with the end of the oxygenation hose furthest from the oxygenation disc connected to the aerator. A screening screen is positioned above the placement cavity, with a reinforcing edge fixedly connected to its top. A screening motion mechanism is mounted on the box, with the reinforcing edge connected to the box via the mechanism. The screening motion mechanism includes a displacement component and a limiting component.

[0007] The working principle and beneficial effects of this utility model: 1. Working Principle: The tank contains a pull-out fish collection drawer, which is filled with water and continuously oxygenated by an oxygenation system. A horizontally reciprocating screening screen is located at the top of the tank. The operator manually pushes the screen back and forth at a constant speed to move it along a track. Snakehead fish fry smaller than the mesh size fall through the screen into the oxygen-rich water collection drawer below, completing the grading and collection process. After screening, the water in the drawer is quickly drained through a drainage system to collect the fry. The entire device is moved by casters, and a limiting mechanism ensures stable operation of each component, thus achieving efficient and low-damage mechanized screening.

[0008] 2. Beneficial effects: (1) Existing technology achieves preliminary grading of fish fry by setting up multi-stage fixed screens, reducing damage caused by repeated operations. However, the existing fixed screen structure cannot be quickly adjusted or replaced, resulting in limited equipment applicability. This solution achieves quick screen replacement and fastening by setting up a sliding and detachable screen and its limiting components, adapting to the screening needs of fish fry of different sizes, and improving the equipment's versatility and ease of operation.

[0009] (2) This solution ensures that the fish fry are always in an oxygen-rich water environment during the screening process by using the inclined bottom design of the fish collection drawer and the oxygen supply guarantee of the oxygenation tray, thereby reducing stress and damage. At the same time, the combination of the drawer wheels and the arc-shaped limiting groove enhances the stability of the drawer movement, avoids the escape or damage of the fish fry caused by shaking, and improves the reliability of the screening operation and the survival rate of the fish fry.

[0010] Preferably, the displacement assembly includes two T-shaped rods located above the housing and fixedly connected to the top surface of the housing. A slider is mounted on each T-shaped rod, and a groove is formed on the bottom surface of the slider. The slider is slidably connected to the corresponding T-shaped rod. In the displacement assembly, the two T-shaped rods are fixedly connected to the housing, and the slider mounted above them forms a sliding fit structure with the T-shaped rods through the bottom groove, allowing the screening mesh to move smoothly in the horizontal direction to complete the screening process.

[0011] Preferably, the limiting component includes a clamping block located on the side of the slider near the reinforcing edge. A through hole is formed in the side wall of the clamping block, penetrating the side wall. A rotating groove is formed within the through hole, and a rotating column is disposed within the through hole. A threaded groove is formed on the side of the slider near the clamping block. A threaded rod is fixedly connected to the side of the rotating column near the threaded groove, located within the threaded groove and threadedly connected to the inner wall of the threaded groove. A rotating ring is fixedly connected to the circumference of the rotating column, located within the rotating groove and slidably connected to the inner wall of the rotating groove. A limiting block is fixedly connected to the side of the slider near the clamping block. A clamping groove is formed on the side of the clamping block near the limiting block. The limiting component achieves the clamping block's fastening function through the threaded rod and threaded groove between the clamping block and the slider. The sliding design of the rotating ring within the rotating groove allows the operator to easily rotate and lock the clamping block, thereby firmly fixing the reinforcing edge on the screening mesh and preventing displacement during the screening process.

[0012] Preferably, a first drain outlet is provided on the rear side of the fish collection drawer, and a second drain outlet connected to the first drain outlet is provided on the side of the box body near the first drain outlet. A sealing plug is inserted into the first drain outlet. This structure facilitates the rapid drainage of water inside the box when needed, while maintaining the sealing performance of the device during normal use.

[0013] Preferably, the bottom surface of the box is fixedly equipped with several casters, the bottom surface of the fish collecting drawer is fixedly connected with several drawer wheels, the inner bottom surface of the placement cavity is provided with several limiting grooves, the drawer wheels are located in the corresponding limiting grooves, the front side wall of the box is fixedly connected with a ramp, the casters installed at the bottom of the box enable the entire device to move flexibly, and the ramp structure set on the front side of the box provides guidance and transition support for the fish collecting drawer to enter and exit.

[0014] Preferably, a handle is fixedly connected to the front side wall of the fish collecting drawer, and the inner bottom surface of the fish collecting drawer is inclined with the front higher than the back. The handle installed on the front side of the fish collecting drawer facilitates manual pushing and pulling operation. The inclined design of the inner bottom surface with the front higher than the back is conducive to the water body gathering to the rear, and at the same time, it is convenient for the fish fry to be concentrated towards the drain outlet with the water flow, thereby improving the fish fry collection efficiency.

[0015] Preferably, each of the two boxes has a first connecting hole on its side wall, and the same U-shaped connector is snapped onto the adjacent side walls of the two boxes. The U-shaped connector has a second connecting hole corresponding to the first connecting hole, and the second connecting hole and the corresponding first connecting hole are connected. A bolt is installed in the second connecting hole, and the bolt passes through the corresponding second connecting hole and the first connecting hole and extends to the outside. A nut is threaded onto the bolt, and a washer is provided between the nut and the U-shaped connector. The washer fits tightly against and abuts against the side wall of the U-shaped connector, realizing a detachable rigid connection between the two boxes. This ensures the structural stability and integrity of the boxes when placed side by side, while also taking into account the ease of assembly and connection reliability. It is suitable for modular combination or transportation and disassembly requirements. Attached Figure Description

[0016] Figure 1 This utility model patent discloses a three-dimensional structure for a screening device for the size of snakehead seedlings. Figure 1 ; Figure 2 This utility model patent discloses a three-dimensional structure for a screening device for the size of snakehead seedlings. Figure 2 ; Figure 3 This is a cross-sectional view of the box area of ​​a screening device for the size of snakehead seedlings according to this utility model patent; Figure 4 This is a cross-sectional view of the fish collection drawer area of ​​a screening device for the size of snakehead fry, as described in this utility model patent. Figure 5 This is a structural diagram of a limiting component of a screening device for the size of snakehead seedlings, which is a utility model patent. Figure 6 This is a structural diagram of the U-shaped connector area of ​​a screening device for the size of snakehead seedlings, which is a utility model patent.

[0017] The reference numerals in the accompanying drawings of the instruction manual include: 1. Box body; 2. Placement cavity; 3. Fish collection drawer; 4. Oxygenation tray; 5. Oxygenation hose; 6. Screening mesh; 7. Reinforcing edge; 8. T-shaped rod; 9. Slider; 10. Slide groove; 11. Clamping block; 12. Through hole; 13. Rotating groove; 14. Rotating column; 15. Rotating ring; 16. Threaded rod; 17. Threaded groove; 18. Limiting block; 19. Clamping groove; 20. Caster; 21. Drawer wheel; 22. Limiting groove; 23. First drain outlet; 24. Second drain outlet; 25. Sealing plug; 26. Ramp; 27. Handle; 28. Water inlet pipe; 29. ​​Aerator; 30. First connecting hole; 31. U-shaped connector; 32. Second connecting hole; 33. Bolt; 34. Nut; 35. Washer. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] like Figure 1 - Figure 6 As shown, a screening device for the size of snakehead fry includes two boxes 1. Each box 1 has a placement cavity 2 that extends through the front wall of the box 1 and communicates with the outside. A fish-collecting drawer 3 is installed inside the placement cavity 2. A water inlet pipe 28 is installed above the fish-collecting drawer 3, with one end extending into the drawer and the other end connected to an external water pump. An oxygenation disc 4 is installed on the bottom of the drawer 3, and an oxygenation hose 5 is connected to the disc. An aerator 29 is fixedly installed on the rear wall of the box 1, with the end of the oxygenation hose 5 away from the oxygenation disc 4 connected to the aerator 29. A screening mesh 6 is installed above the placement cavity 2, with a reinforcing edge 7 fixedly connected to the top of the mesh 6. A screening motion mechanism is installed on the box 1, with the reinforcing edge 7 connected to the box 1 via the mechanism. The screening motion mechanism includes a displacement component and a limiting component.

[0020] More specifically, the displacement component includes two T-shaped rods 8, which are located above the box 1 and are fixedly connected to the top surface of the box 1. A slider 9 is mounted on each T-shaped rod 8, and a groove 10 is provided on the bottom surface of the slider 9. The slider 9 is slidably connected to the corresponding T-shaped rod 8. This screening device achieves sorting by manually driving the screening mesh 6 to perform horizontal reciprocating motion. The principle is that the operator directly pushes the screening mesh 6, causing it to move smoothly back and forth along a fixed track through the sliding cooperation between the slider 9 and the T-shaped rod 8. This mechanized reciprocating motion allows snakehead fry smaller than the mesh size to fall through the mesh into the fish collection drawer 3, while larger fry are effectively intercepted on the screen surface. Its beneficial effects are that it achieves efficient and uniform mechanized sorting, significantly reducing the labor intensity of manual sorting, while ensuring the accuracy and consistency of grading.

[0021] More specifically, the limiting component includes a clamping block 11, located on the side of the slider 9 near the reinforcing edge 7. A through hole 12 is formed in the side wall of the clamping block 11, penetrating the side wall. A rotating groove 13 is formed within the through hole 12, and a rotating post 14 is disposed within the through hole 12. A threaded groove 17 is formed on the side of the slider 9 near the clamping block 11. A threaded rod 16 is fixedly connected to the side of the rotating post 14 near the threaded groove 17, located within the threaded groove 17 and threadedly connected to the inner wall of the threaded groove 17. A rotating ring 15 is fixedly connected to the circumference of the rotating post 14, located within the rotating groove 13 and slidably connected to the inner wall of the rotating groove 13. The side of the slider 9 near the clamping block 11 is fixed... The clamping block 11 is connected to the limiting block 18, and a clamping groove 19 is provided on the side of the clamping block 11 near the limiting block 18. The limiting component realizes the rapid fixation of the screen through mechanical transmission. The principle is that by rotating the rotating column 14, the threaded rod 16 is driven into the threaded groove 17 of the slider 9. The threaded transmission pushes the clamping block 11 to move towards the limiting block 18, thereby firmly clamping the reinforcing edge 7 of the screen 6 between the clamping groove 19 and the limiting block 18. The sliding design of the rotating ring 15 in the rotating groove 13 not only ensures smooth rotation, but also effectively prevents the threaded rod 16 from loosening unexpectedly. Its beneficial effect is to provide a reliable and easy-to-operate screen fixing method, ensure the stability of the screen during the screening process, and facilitate the quick replacement of screens of different specifications to adapt to different sorting needs.

[0022] More specifically, a first drain outlet 23 is provided on the rear side of the fish collection drawer 3, and a second drain outlet 24 connected to the first drain outlet 23 is provided on the side of the box body 1 near the first drain outlet 23. A sealing plug 25 is inserted into the first drain outlet 23. The water filling design of the fish collection drawer 3 provides a suitable environment for the screening process. The principle is that the drawer needs to be filled with water before screening, so that about one-third of the bottom of the screening net 6 is immersed in the water. The presence of water provides a buffer for the fish fry and reduces the risk of mechanical damage.

[0023] More specifically, several casters 20 are fixedly installed on the bottom surface of the housing 1, and several drawer wheels 21 are fixedly connected to the bottom surface of the fish collecting drawer 3. Several limiting grooves 22 are opened on the inner bottom surface of the placement cavity 2, and the drawer wheels 21 are located in the corresponding limiting grooves 22. A ramp 26 is fixedly connected to the front side wall of the housing 1. The moving positioning system of the housing 1 and the fish collecting drawer 3 ensures the stability and flexibility of the equipment. The principle is that the casters 20 at the bottom of the housing enable the movement of the whole machine, while the drawer wheels 21 at the bottom of the fish collecting drawer 3 cooperate with the arc-shaped limiting grooves 22 on the inner bottom surface of the placement cavity 2. The arc-shaped surface effectively constrains the drawer wheels. The beneficial effect is that the casters 20 enable the equipment to move easily in the work area, improving the utilization rate of the equipment; while the precise positioning of the drawer wheels 21 by the arc-shaped limiting grooves 22 effectively prevents the drawer from shaking after being filled with water and bearing weight, ensuring the stability and safety of the operation process.

[0024] More specifically, the front side wall of the fish collection drawer 3 is fixedly connected to a handle 27. The bottom surface of the fish collection drawer 3 is inclined with the front higher than the back, which is conducive to the natural collection of water and fish fry. Its beneficial effect is that it significantly reduces the stress response and physical damage to fish fry during the screening process, improves the survival rate of fry, and provides convenience for subsequent collection and transfer operations.

[0025] More specifically, each of the two housings 1 has a first connecting hole 30 on its side wall. The same U-shaped connector 31 is snapped onto the adjacent side walls of the two housings 1. The U-shaped connector 31 has a second connecting hole 32 corresponding to the first connecting hole 30. The second connecting hole 32 and the corresponding first connecting hole 30 are connected. A bolt 33 is installed in the second connecting hole 32. The bolt 33 passes through the corresponding second connecting hole 32 and the first connecting hole 30 and extends to the outside. A nut 34 is threaded onto the bolt 33. A washer 35 is installed between the nut 34 and the U-shaped connector 31. The washer 35 is tightly fitted and abuts against the side wall of the U-shaped connector 31. The U-shaped connector 31 spans the adjacent side walls of the two housings 1. Through the fastening action of the bolt 32 and nut 33 passing through the first connecting hole 27 and the second connecting hole 31, and with the addition of the washer 34 to enhance the friction and pressure distribution of the contact surface, the two independent housings 1 are rigidly connected into a whole. Its beneficial effects include enabling rapid and reliable assembly of modular boxes, significantly enhancing the structural stability and overall rigidity of the combined device, effectively preventing relative displacement or vibration between boxes during screening operations, and facilitating disassembly, thus meeting the practical needs of flexible equipment layout, transportation, and storage.

[0026] As can be seen from the above, the specific embodiments of this utility model are as follows: The operator first smoothly pushes the fish collecting drawer 3 into the placement cavity 2 of the tank 1, ensuring that the drawer wheels 21 at the bottom of the fish collecting drawer 3 are accurately embedded in the arc-shaped limiting groove 22 opened on the bottom surface of the placement cavity 2 for stable positioning. Then, clean water is injected into the fish collecting drawer 3 through the water inlet pipe 28 connected to an external water pump until the water level reaches about one-third of the depth of the screening screen 6. At this time, the aerator 29 fixed to the rear side wall of the tank 1 is started, and oxygen is delivered through the oxygenation hose 5 to the oxygenation disc 4 installed inside the fish collecting drawer 3, continuously releasing fine bubbles. Next, the operator selects a screening screen 6 with a specific mesh size, aligns its reinforcing edges 7 on both sides, and places it on the slider of the displacement component above the tank 1. In the gap between the 9 and the clamping block 11 of the limiting component, the rotating column 14 is rotated by hand. The rotating ring 15 on the side of the rotating column 14 slides smoothly in the rotating groove 13 opened in the through hole 12 of the clamping block 11. At the same time, the threaded rod 16 at the front end of the rotating column 14 is screwed into the threaded groove 17 opened on the side of the slider 9. Through the threaded transmission, the clamping block 11 moves towards the slider 9. Finally, the clamping groove 19 on the side wall of the clamping block 11 and the limiting block 18 fixedly connected to the side of the slider 9 work together to firmly clamp the reinforcing edge 7 of the screen 6 between them. After the installation is completed, the operator pushes the screen 6 back and forth manually. The screen 6 drives the slider 9 connected to both ends to slide through the groove opened on the bottom surface. The trough 10 slides smoothly horizontally along the T-shaped rod 8 fixed to the top surface of the box 1. During the reciprocating motion of the screening net 6, snakehead fry smaller than the mesh size fall smoothly through the mesh into the oxygen-rich water of the fish collection drawer 3 below under the buoyancy and lubrication of the water. Larger fry are effectively intercepted on the upper surface of the screening net 6. After the screening operation, the large fry remaining on the net surface can be collected directly, while the small fry that fall into the fish collection drawer 3 are pulled out by pulling the handle fixed to the front side wall of the fish collection drawer 3 and pulling out the drawer along the ramp 26 fixed to the front side wall of the box 1. Utilizing the sloping bottom design of the fish collection drawer 3, which is higher at the front and lower at the back, the water and fry naturally collect at the rear of the drawer. If drainage is required, the sealing plug 25 that is snapped into the first drain port 23 on the back side of the fish collection drawer 3 can be removed. The accumulated water will then be discharged through the first drain port 23 and the second drain port 24 connected to the side of the box 1. Finally, when it is necessary to move the equipment, the entire device can be moved by the casters 20 fixedly installed on the bottom of the box 1. If a larger batch of fish fry needs to be processed, the two boxes 1 can be placed side by side and the U-shaped connector 31 can be snapped into the adjacent side walls of the two boxes 1. The second connection hole 31 on the U-shaped connector 31 should be aligned with the first connection hole 27 on the side wall of the box 1. After inserting the bolt 32 and putting on the washer 34, tighten the nut 33 to firmly connect the two boxes 1 into a whole working unit.

[0027] The above descriptions are merely embodiments of this utility model, and common knowledge regarding specific structures and characteristics is not elaborated upon here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of this utility model, and these should also be considered within the scope of protection of this utility model. These modifications will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application shall be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A screening device for the size of snakehead seedlings, comprising two boxes (1), characterized in that: The box (1) has a placement cavity (2) inside, which penetrates the front side wall of the box (1) and is connected to the outside. A fish collection drawer (3) is provided inside the placement cavity (2). A water inlet pipe (28) is provided above the fish collection drawer (3). One end of the water inlet pipe (28) extends into the fish collection drawer (3), and the other end of the water inlet pipe (28) is connected to an external water pump. An oxygenation tray (4) is installed on the bottom surface of the inside of the fish collection drawer (3). The oxygenation tray (4) is connected to a... An oxygenation hose (5) is provided. An oxygenator (29) is fixedly installed on the rear side wall of the box (1). The end of the oxygenation hose (5) away from the oxygenation plate (4) is connected to the oxygenator (29). A screening screen (6) is provided above the placement cavity (2). A reinforcing edge (7) is fixedly connected to the top of the screening screen (6). A screening motion mechanism is provided on the box (1). The reinforcing edge (7) is connected to the box (1) through the screening motion mechanism. The screening motion mechanism includes a displacement component and a limiting component.

2. The screening device for the size of snakehead seedlings according to claim 1, characterized in that: The displacement assembly includes two T-shaped rods (8), which are located above the box (1). The T-shaped rods (8) are fixedly connected to the top surface of the box (1). A slider (9) is provided on the T-shaped rod (8). A groove (10) is provided on the bottom surface of the slider (9). The slider (9) is slidably connected to the corresponding T-shaped rod (8).

3. The screening device for the size of snakehead seedlings according to claim 2, characterized in that: The limiting component includes a clamping block (11), which is located on the side of the slider (9) near the reinforcing edge (7). A through hole (12) is provided on the side wall of the clamping block (11), which penetrates the side wall of the clamping block (11). A rotating groove (13) is provided in the through hole (12), and a rotating column (14) is provided in the through hole (12). A threaded groove (17) is provided on the side of the slider (9) near the clamping block (11), and a threaded part is fixedly connected to the side of the rotating column (14) near the threaded groove (17). The threaded rod (16) is located in the threaded groove (17) and is threaded to the inner wall of the threaded groove (17). A rotating ring (15) is fixedly connected to the circumference of the rotating column (14). The rotating ring (15) is located in the rotating groove (13) and is slidably connected to the inner wall of the rotating groove (13). A limiting block (18) is fixedly connected to the side of the slider (9) near the clamping block (11). A clamping groove (19) is opened on the side of the clamping block (11) near the limiting block (18).

4. The screening device for the size of snakehead seedlings according to claim 1, characterized in that: The fish collection drawer (3) has a first drain outlet (23) on the rear side, and the box body (1) has a second drain outlet (24) connected to the first drain outlet (23) on the side close to the first drain outlet (23). A sealing plug (25) is inserted into the first drain outlet (23).

5. The screening device for the size of snakehead seedlings according to claim 1, characterized in that: The bottom surface of the box (1) is fixedly equipped with several casters (20), the bottom surface of the fish collection drawer (3) is fixedly connected with several drawer wheels (21), the bottom surface of the placement cavity (2) is provided with several limiting grooves (22), the drawer wheels (21) are located in the corresponding limiting grooves (22), and the front side wall of the box (1) is fixedly connected with a ramp (26).

6. The screening device for the size of snakehead seedlings according to claim 1, characterized in that: The front side wall of the fish collection drawer (3) is fixedly connected to a handle (27), and the bottom surface of the fish collection drawer (3) is inclined with the front higher than the back.

7. The screening device for the size of snakehead seedlings according to claim 1, characterized in that: Both of the box bodies (1) have a first connection hole (30) on their side walls. The same U-shaped connector (31) is snapped onto the adjacent side walls of the two box bodies (1). The U-shaped connector (31) has a second connection hole (32) corresponding to the first connection hole (30). The second connection hole (32) and the corresponding first connection hole (30) are connected. A bolt (33) is provided in the second connection hole (32). The bolt (33) passes through the corresponding second connection hole (32) and the first connection hole (30) and extends to the outside. A nut (34) is threaded onto the bolt (33). A washer (35) is provided between the nut (34) and the U-shaped connector (31). The washer (35) is tightly fitted and abuts against the side wall of the U-shaped connector (31).

Images