A device for air floatation sorting of juvenile chiton larvae

Abstract

This invention relates to the field of razor clam aquaculture technology and discloses an air flotation sorting device for juvenile razor clam shells. The device includes a sorting box, which is a rectangular box structure with an open top. Side limiting plates are fixedly installed on the inner walls of the left and right sides of the sorting box. A layered screening mechanism is movably installed inside the sorting box corresponding to the inner side of the side limiting plates. The highest point of the side limiting plates is flush with the highest point of the layered screening mechanism after installation. In this invention, the sorting box stores water, and the entire sorting process for juvenile razor clam shells is completed in an aquatic environment, eliminating the problem of dehydration damage. This design aligns with the aquatic survival characteristics of juvenile razor clam shells, significantly improving the survival rate of sorted juvenile razor clam shells. It solves the problems of traditional sorting methods that result in detachment from the water and low survival rates. The device uses microporous ceramic aeration plates to generate fine and uniform microbubbles, which gently agitate the water, creating a gentle flow without hard impacts. This is suitable for thin-shelled juvenile razor clam shells, reducing the breakage rate of juvenile razor clam shells from the source.

Description

Technical Field

[0001] This invention relates to the field of razor clam aquaculture technology, and in particular to a flotation separation device for juvenile razor clam shells. Background Technology

[0002] Razor clams are a high-quality marine shellfish, characterized by their delicious meat and high economic value. They are an important species for marine aquaculture. In the artificial breeding and cultivation process of razor clams, the sorting of juvenile clams is a key processing step. They need to be graded and screened according to their individual size to ensure uniform breeding density and improve the survival rate and growth quality of juvenile clams.

[0003] Currently, the sorting process for juvenile razor clams has technical shortcomings: The shells of juvenile razor clams are only 0.1mm-0.2mm thick, extremely thin, brittle, and have very poor impact resistance. Traditional vibrating screens and mechanical agitation sorting equipment easily damage the shells, leading to the death of the juveniles and a persistently high damage rate. Juvenile razor clams are also highly dependent on the aquatic environment; after being removed from water, they suffer dehydration damage and a sharp drop in activity within a short time, severely reducing their survival rate. Therefore, the entire sorting process for juvenile clams must be completed in an aquatic environment. Existing sorting equipment... Using dry vibrating screens, manual harvesting and sorting, or ordinary still water screening structures, dry screening cannot meet the requirements of the aquatic environment for juvenile clams; manual sorting is labor-intensive, has low sorting efficiency, and poor grading accuracy; ordinary still water screening has a static water flow, which makes juvenile clams easy to accumulate and stick together, and the screen holes are easy to clog. Relying solely on their own gravity for sedimentation and sorting, the screening power is insufficient, resulting in serious mixing of juvenile clams of different sizes, poor sorting effect, and the screening process is prone to scraping thin shells, causing damage to juvenile clams. It is difficult to adapt to the needs of large-scale, refined, and low-damage razor clam sorting and production. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a flotation separation device for juvenile razor clams to solve the problems of easy damage, low survival rate after leaving the water, easy clogging of screen holes, poor separation accuracy and low operation efficiency of juvenile razor clams in the prior art.

[0005] To address the aforementioned problems, the present invention is implemented through the following technical solution.

[0006] A flotation sorting device for juvenile razor clams includes: a sorting box, which is a rectangular box structure with an open top; side limiting plates are fixedly installed on the inner walls of the left and right sides of the sorting box; a layered screening mechanism is movably installed inside the sorting box corresponding to the inner side of the side limiting plates; the highest point of the side limiting plates is flush with the highest point of the layered screening mechanism after installation; telescopic limiting components are provided at the upper end of the side limiting plates corresponding to the two ends of the inner side of the sorting box; a connecting base plate is welded and fixed to one side of the outer side of the sorting box, and an aeration-type auxiliary screening mechanism is provided at the upper end of the connecting base plate corresponding to the bottom of the inner side of the sorting box.

[0007] In one embodiment, the layered screening mechanism includes a first supporting side plate, a first layered fixing plate, a first layered screen, a second supporting side plate, a second layered fixing plate, a third layered screen, a third supporting side plate, a third layered fixing plate, and a fourth layered screen. The first supporting side plate, the second supporting side plate, and the third supporting side plate are arranged in parallel and vertically on both sides inside the sorting box.

[0008] In one embodiment, the first layered fixing plate is horizontally fixed to the upper end of the first supporting side plate, the second layered fixing plate is horizontally fixed to the upper end of the second supporting side plate, and the third layered fixing plate is horizontally fixed to the upper end of the third supporting side plate.

[0009] In one embodiment, the layered screens one, three, and four are all made of nylon and are respectively snapped and fixed to the inner sides of the layered fixing plates one, two, and three. The mesh diameters of the layered screens four, three, and one decrease sequentially from top to bottom, and the mesh diameters of the three are set to 15mm, 10mm, and 5mm respectively, forming a multi-level layered sorting structure with distinct specifications.

[0010] In one embodiment, the telescopic limiting assembly includes a fixed seat, a first telescopic rod, a second telescopic rod, a central limiting pin, an arc-shaped limiting baffle, a first side limiting pin, a second side limiting pin, and a connecting limiting pin. The fixed seats are symmetrically fixed on the inner walls of both sides of the sorting box, and two sets of fixed seats are arranged side by side on each inner wall of the sorting box.

[0011] In one embodiment, the first telescopic rod and the second telescopic rod are symmetrically hinged and assembled on the outside of the fixed seat. The two are rotated with the fixed seat by means of a connecting limiting pin. The central limiting pin is transversely inserted through the middle of the first telescopic rod and the second telescopic rod to achieve linkage positioning.

[0012] In one embodiment, the movable ends of the telescopic rod one and the telescopic rod two away from the fixed seat are hinged to an arc-shaped limiting baffle. The arc-shaped limiting baffle is rotatably connected to the telescopic rod two through a side limiting pin one, and is rotatably connected to the telescopic rod one through a side limiting pin two.

[0013] In one embodiment, the aeration-type auxiliary screening mechanism includes a mounting base, mounting screws, mounting holes, an air inlet connector, a sealing plate, microporous ceramic aeration plates, an air chamber, a check valve, an air guide pipe, an air volume regulating valve, and a Roots blower. The aeration-type auxiliary screening mechanism is installed and fixed on the inner side of the bottom of the sorting box and the upper end of the connecting base plate. The mounting base is locked and fixed to the bottom wall of the sorting box by mounting screws.

[0014] In one embodiment, the air inlet connector is provided through the mounting hole in the middle of the mounting base, the air outlet end of the air inlet connector is connected to a sealing plate, the microporous ceramic aeration plate is fixedly installed above the sealing plate, the microporous ceramic aeration plate and the sealing plate together form a sealed air chamber, and the air inlet connector is provided at the bottom of the sealing plate and communicates with the air chamber.

[0015] In one embodiment, a check valve, an air guide pipe, and an air volume regulating valve are sequentially connected to the lower end of the air inlet connector. The air volume regulating valve is nested at the connection position between the outer wall of the sorting box and the air guide pipe. The end of the air guide pipe is connected to the air outlet of the Roots blower. Control levers are fixedly installed on both sides of the outer side of the sorting box.

[0016] This invention provides an air flotation separation device for juvenile razor clams. Compared with the prior art, it has the following advantages: This invention uses a water-storage sorting box to complete the sorting of juvenile clams entirely within an aquatic environment, eliminating the problem of dehydration and damage to the juvenile clams. It is well-suited to the aquatic survival characteristics of juvenile razor clams, significantly improving the survival rate of juvenile clams after sorting. It solves the pain points of traditional sorting methods, which result in clams being separated from the water and having a low survival rate. It uses microporous ceramic aeration plates to generate aeration and produce fine and uniform microbubbles, which slowly agitate the water. The water flow is gentle and does not cause hard impacts, unlike mechanical vibration or prying structures. It will not collide with or squeeze thin-shelled juvenile clams, making it suitable for thin-shelled razor clams. It reduces the breakage rate of juvenile clams from the source and protects the integrity of the clams. This invention features a three-tiered nylon screen with apertures of 15mm, 10mm, and 5mm, decreasing in size from top to bottom. Utilizing air-blown water flow to suspend and tumble the juvenile clams, they are sieved according to individual size. Larger clams are retained on the upper screen, while smaller clams settle and are sieved layer by layer, resulting in clear grading and high sorting accuracy. The soft nylon screen prevents scratches and abrasions to the juvenile shells caused by rigid materials. The rising water flow from continuous aeration washes over the screen mesh, effectively preventing impurities and clams from sticking and clogging the mesh, ensuring continuous sieving. A telescopic limiting component, with arc-shaped baffles, limits the two ends of the screening mechanism, preventing deviation and shaking during stratification and improving equipment stability. The side limiting plate is flush with the highest point of the screening mechanism to prevent juvenile clams from overflowing and being lost. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the air flotation separation device for juvenile razor clams.

[0018] Figure 2 This is a schematic diagram of the structure of the stratified screening mechanism and the sorting box after separation in the air flotation sorting device for juvenile razor clams.

[0019] Figure 3 This is a schematic diagram of the internal structure of the sorting box in the air flotation sorting device for juvenile razor clams.

[0020] Figure 4 A schematic diagram of the telescopic limiting component structure of the air flotation separation device for juvenile razor clams.

[0021] Figure 5 This is a partial sectional structural diagram of the aeration-type auxiliary screening mechanism in the air flotation separation device for juvenile razor clams.

[0022] Figure 6 A bottom view of the aeration-type auxiliary screening mechanism of the air flotation separation device for juvenile razor clams.

[0023] Figure 7 Air flotation separation device for juvenile razor clams Figure 6 Enlarged structural diagram at point A in the middle.

[0024] The attached figures are labeled as follows: 1. Sorting box; 2. Side limiting plate; 3. Layered screening mechanism; 301. Supporting side plate one; 302. Layered fixing plate one; 303. Layered screen one; 304. Supporting side plate two; 305. Layered fixing plate two; 306. Layered screen three; 307. Supporting side plate three; 308. Layered fixing plate three; 309. Layered screen four; 4. Telescopic limiting assembly; 401. Fixed base; 402. Telescopic rod one; 403. Telescopic rod two; 404. Center limiting pin; 40 5. Arc-shaped limiting baffle; 406. Side limiting pin one; 407. Side limiting pin two; 408. Connecting limiting pin; 5. Connecting base plate; 6. Aeration auxiliary screening mechanism; 601. Mounting seat; 602. Mounting screw; 603. Mounting hole; 604. Air inlet connector; 605. Sealing plate; 606. Microporous ceramic aeration plate; 607. Air chamber; 608. Check valve; 609. Air guide pipe; 610. Air volume regulating valve; 611. Roots blower; 7. Control lever. Detailed Implementation

[0025] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of protection of the present invention.

[0026] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.

[0027] Reference Figures 1-7A flotation sorting device for juvenile razor clams includes: a sorting box 1, which is a rectangular box structure with an open top; side limiting plates 2 are fixedly installed on the inner walls of the left and right sides of the sorting box 1; a layered screening mechanism 3 is movably installed inside the sorting box 1 corresponding to the inner side of the side limiting plates 2; the highest point of the side limiting plates 2 is flush with the highest point of the layered screening mechanism 3 after installation; telescopic limiting components 4 are provided at the upper end of the side limiting plates 2 corresponding to the two ends of the inner side of the sorting box 1; a connecting base plate 5 is welded and fixed to one side of the outer side of the sorting box 1; and an aeration-type auxiliary screening mechanism 6 is provided at the upper end of the connecting base plate 5 corresponding to the bottom of the inner side of the sorting box 1.

[0028] The layered screening mechanism 3 includes a first support side plate 301, a first layered fixing plate 302, a first layered screen 303, a second support side plate 304, a second layered fixing plate 305, a third layered screen 306, a third support side plate 307, a third layered fixing plate 308, and a fourth layered screen 309. The first support side plate 301, the second support side plate 304, and the third support side plate 307 are arranged in parallel and vertically on both sides inside the sorting box 1.

[0029] Layered fixing plate 1 302 is horizontally fixed to the upper end of support side plate 1 301, layered fixing plate 2 305 is horizontally fixed to the upper end of support side plate 2 304, and layered fixing plate 3 308 is horizontally fixed to the upper end of support side plate 3 307.

[0030] Layered screens 303, 306, and 309 are all made of nylon and are respectively snapped and fixed to the inside of layered fixing plates 302, 305, and 308. The mesh sizes of layered screens 309, 306, and 303 decrease sequentially from top to bottom, with the mesh sizes set to 15mm, 10mm, and 5mm respectively, forming a multi-level layered sorting structure with distinct size gradients.

[0031] The telescopic limiting assembly 4 includes a fixed base 401, a first telescopic rod 402, a second telescopic rod 403, a central limiting pin 404, an arc-shaped limiting baffle 405, a first side limiting pin 406, a second side limiting pin 407, and a connecting limiting pin 408. The fixed base 401 is symmetrically fixed on the inner walls of both sides of the sorting box 1, and two sets of fixed bases 401 are arranged side by side on the inner wall of each side of the sorting box 1.

[0032] Telescopic rod 1 402 and telescopic rod 2 403 are symmetrically hinged and assembled on the outside of fixed base 401. The two are rotated with fixed base 401 by means of connecting limit pin 408. The central limit pin 404 is transversely inserted in the middle of telescopic rod 1 402 and telescopic rod 2 403 to achieve linkage positioning.

[0033] The movable ends of telescopic rod 1 402 and telescopic rod 2 403 away from the fixed base 401 are hinged together to an arc-shaped limiting baffle 405. The arc-shaped limiting baffle 405 is rotatably connected to telescopic rod 2 403 through side limiting pin 1 406, and is rotatably connected to telescopic rod 1 402 through side limiting pin 2 407.

[0034] The aeration-type auxiliary screening mechanism 6 includes a mounting base 601, mounting screws 602, mounting holes 603, air inlet connector 604, sealing plate 605, microporous ceramic aeration plates 606, air chamber 607, check valve 608, air guide pipe 609, air volume regulating valve 610, and Roots blower 611. The aeration-type auxiliary screening mechanism 6 is installed and fixed on the inner side of the bottom of the sorting box 1 and the upper end of the connecting base plate 5. The mounting base 601 is locked and fixed to the bottom wall of the sorting box 1 by mounting screws 602.

[0035] An air inlet connector 604 is installed through a mounting hole 603 in the middle of the mounting base 601. The air outlet end of the air inlet connector 604 is connected to a sealing plate 605. A microporous ceramic aerator 606 is fixedly installed above the sealing plate 605. The microporous ceramic aerator 606 and the sealing plate 605 together form a sealed air chamber 607. The air inlet connector 604 is connected to the bottom of the sealing plate 605 and communicates with the air chamber 607.

[0036] The lower end of the air inlet connector 604 is sequentially connected to a check valve 608, an air guide pipe 609, and an air volume regulating valve 610. The air volume regulating valve 610 is nested and installed at the connection position between the outer wall of the sorting box 1 and the air guide pipe 609. The end of the air guide pipe 609 is connected to the air outlet of the Roots blower 611. Control levers 7 are fixedly installed on both sides of the outside of the sorting box 1.

[0037] During use, the operator first holds the control levers 7 fixed on both sides of the sorting box 1 and moves the sorting box 1 to the aquaculture sorting operation area, ensuring that the sorting box 1 is placed stably. The highest point of the side limiting plates 2 fixed on the inner walls of the left and right sides of the sorting box 1 is level with the highest point of the layered screening mechanism 3. The operator adjusts the telescopic limiting component 4 at the upper end of the side limiting plate 2, using the fixed base 401 as the mounting base, and manually moves the telescopic rod 1 402 and telescopic rod 2 403, so that the two rods rotate around the connecting limiting pin 408 as the rotation fulcrum, cooperating with the central limiting pin 40 4. Complete the synchronous linkage and centering positioning of the two telescopic rods, so that the arc-shaped limiting baffle 405 hinged to the movable ends of telescopic rod 1 402 and telescopic rod 2 403 fits tightly against the upper end of the layered screening mechanism 3. The arc-shaped limiting baffle 405 is respectively rotated with telescopic rod 2 403 and telescopic rod 1 402 through side limiting pin 1 406 and side limiting pin 2 407, respectively, and adaptively fixes the upper surface of the layered fixing plate 3 308 to realize the limiting and fixing of the layered screening mechanism 3 in the sorting box 1, and prevents the layered screening mechanism 3 from floating or shaking longitudinally under the disturbance of water flow during the sorting process. Then, seawater or aquaculture water is injected into the sorting box 1 with the top opening. The water level completely submerges the stratified screening mechanism 3 to ensure that the juvenile razor clam is in the water environment throughout the process and to avoid dehydration and death. After the water injection is completed, the juvenile razor clam of mixed sizes is evenly placed into the water inside the sorting box 1. After completing the preliminary positioning preparations, the Roots blower 611 in the aeration-type auxiliary screening mechanism 6 is started. The Roots blower 611, as the air source power component, generates a continuous and stable airflow. The airflow is transported through the air guide pipe 609. The operator adjusts the gas flow rate inside the pipeline through the air volume regulating valve 610 nested on the outer wall of the sorting box 1, thereby controlling the density of aeration bubbles and the intensity of water disturbance, adapting to the sorting conditions of different numbers and sizes of juvenile clam shells. The airflow passes through the air volume regulating valve. After 610, the water flows through check valve 608, which blocks the backflow of water in one direction to prevent the aquaculture water inside the sorting box 1 from flowing back into the air pipe 609 and the Roots blower 611, thus avoiding equipment corrosion and damage. The airflow continues to be transmitted to the air inlet connector 604, which passes through the mounting hole 603 in the middle of the mounting base 601. The mounting base 601 is locked and fixed to the bottom wall of the sorting box 1 by mounting screws 602, ensuring that the aeration auxiliary screening mechanism 6 is firmly installed and has excellent sealing performance. Airflow is introduced into the upper end of the sealing plate 605 through the air inlet connector 604, and finally enters the sealed air chamber 607 formed by the sealing plate 605 and the microporous ceramic aeration plate 606. The sealed air chamber 607 stabilizes and evens out the high-pressure airflow, so that the air pressure is evenly distributed. The stabilized airflow is released outward through the micropores of the microporous ceramic aeration plate 606, generating a large number of fine and soft microbubbles. The bubbles rise vertically and slowly from the bottom of the sorting box 1, causing the water inside the sorting box 1 to form a uniform and soft up-and-down circulating turbulent water flow without hard impact water flow, thus avoiding the thin-shelled razor clam juveniles from being damaged by impact. Under the continuous rising of bottom bubbles and the agitation of water circulation, the juvenile razor clam shells inside the sorting box 1 are slowly suspended, rolled, and dispersed with the water flow, completely solving the problems of juvenile clam stacking, sticking, sinking and getting stuck. During the water agitation, the layered screening mechanism 3, which is composed of parallel vertical support from support side plate 1 301, support side plate 2 304, and support side plate 3 307, remains stable. The upper ends of support side plate 1 301, support side plate 2 304, and support side plate 3 307 are respectively fixed with layered fixing plate 1 302, layered fixing plate 2 305, and layered fixing plate 3 308. The three layered fixing plates provide installation support for layered screen 1 303, layered screen 3 306, and layered screen 4 309. Layered screen 4 309, layered screen 3 306, and layered screen 1 303 are all made of flexible nylon material and the aperture decreases from top to bottom, which are 15mm, 10mm, and 5mm respectively, forming a multi-level gradient screening structure. Under the dynamic water flow screening effect, large-sized juvenile clams with a body size greater than 15mm cannot penetrate layered screen 4 309 and are trapped on the surface of the uppermost layered screen 4 309; medium-sized juvenile clams with a body size between 10mm and 15mm penetrate layered screen 4 309 and are trapped on the surface of layered screen 3 306; smaller-sized juvenile clams with a body size between 5mm and 10mm continue to sink downwards and are trapped on the surface of layered screen 1 303; micro-juvenile clams with a body size less than 5mm directly penetrate all the screens and sink to the bottom of the sorting box 1, thus achieving the grading and separation of four different sizes of razor clams. Throughout the entire sorting process, the microporous ceramic aerator 606 continuously generates rising bubbles. These bubbles, carrying water flow, continuously wash over the mesh of the layered screens 303, 306, and 309, flushing away mucus, impurities, and fine silt from the screen surface. This effectively prevents screen clogging and ensures smooth operation during long-term continuous sorting. The nylon screen is soft and has no rigid edges. Combined with the gentle air flotation agitation, it does not compress the thin shells of juvenile razor clams throughout the process, minimizing the sorting damage rate. The connecting base plate 5, welded and fixed to the outside of the sorting box 1, increases the installation support area of ​​the aeration-type auxiliary screening mechanism 6 and is used to fix the Roots blower 611. After the sorting operation is completed, the staff first shuts down the Roots blower 611 and stops the aeration and water supply. After the water is still and the juvenile clams have completely settled on the corresponding screens and the bottom of the box, the staff manually operates the telescopic limit component 4 to release the arc-shaped limit baffle 405 from limiting the layered screening mechanism 3. Then, the staff sequentially removes the support side plates and layered screens inside the layered screening mechanism 3 to collect juvenile clams of different sizes and grades, thus completing a complete sorting process.

[0038] Therefore, although the invention has been described herein with reference to specific embodiments thereof, freedom of modification, various changes and substitutions are also within the scope of the foregoing disclosure, and it should be understood that in some cases, certain features of the invention may be adopted without departing from the scope and spirit of the invention and without corresponding use of other features. Thus, many modifications can be made to adapt a particular environment or material to the essential scope and spirit of the invention. The invention is not intended to be limited to the specific terminology used in the following claims and / or the specific embodiments disclosed as the best mode for carrying out the invention, but the invention will include any and all embodiments and equivalents falling within the scope of the appended claims. Therefore, the scope of the invention will be defined only by the appended claims.

Claims

1. A flotation separation device for juvenile razor clams, characterized in that, include: The sorting box (1) is a rectangular box structure with an open top. Side limiting plates (2) are fixedly installed on the inner walls of the left and right sides of the sorting box (1). A layered screening mechanism (3) is movably installed inside the sorting box (1) corresponding to the inner side of the side limiting plate (2). The highest point of the side limiting plate (2) is flush with the highest point of the layered screening mechanism (3) after installation. Telescopic limiting components (4) are provided at the upper end of the side limiting plate (2) corresponding to the two ends of the inner side of the sorting box (1). A connecting base plate (5) is welded and fixed on one side of the outer side of the sorting box (1), and an aeration auxiliary screening mechanism (6) is provided at the upper end of the connecting base plate (5) corresponding to the bottom of the inner side of the sorting box (1).

2. The air flotation separation device for juvenile razor clams according to claim 1, characterized in that, The layered screening mechanism (3) includes a first support side plate (301), a first layered fixing plate (302), a first layered screen (303), a second support side plate (304), a second layered fixing plate (305), a third layered screen (306), a third support side plate (307), a third layered fixing plate (308), and a fourth layered screen (309). The first support side plate (301), the second support side plate (304), and the third support side plate (307) are arranged in parallel and vertically on both sides inside the sorting box (1).

3. The air flotation separation device for juvenile razor clams according to claim 2, characterized in that, The first layered fixing plate (302) is horizontally fixed to the upper end of the first support side plate (301), the second layered fixing plate (305) is horizontally fixed to the upper end of the second support side plate (304), and the third layered fixing plate (308) is horizontally fixed to the upper end of the third support side plate (307).

4. The air flotation separation device for juvenile razor clams according to claim 3, characterized in that, The layered screens 1 (303), 3 (306), and 4 (309) are all made of nylon and are respectively snapped and fixed to the inner sides of the layered fixing plate 1 (302), the layered fixing plate 2 (305), and the layered fixing plate 3 (308). The mesh diameters of the layered screens 4 (309), 3 (306), and 1 (303) decrease sequentially from top to bottom. The mesh diameters of the three screens are set to 15mm, 10mm, and 5mm respectively, forming a multi-level layered sorting structure with distinct specifications.

5. The air flotation separation device for juvenile razor clams according to claim 1, characterized in that, The telescopic limiting assembly (4) includes a fixed seat (401), a first telescopic rod (402), a second telescopic rod (403), a central limiting pin (404), an arc-shaped limiting baffle (405), a first side limiting pin (406), a second side limiting pin (407), and a connecting limiting pin (408). The fixed seat (401) is symmetrically fixed on the inner walls of both sides of the sorting box (1), and two sets of fixed seats (401) are arranged side by side on each inner wall of the sorting box (1).

6. The air flotation separation device for juvenile razor clams according to claim 5, characterized in that, The first telescopic rod (402) and the second telescopic rod (403) are symmetrically hinged and assembled on the outside of the fixed seat (401). The two are rotated together with the fixed seat (401) by means of the connecting limiting pin (408). The central limiting pin (404) is transversely inserted in the middle of the first telescopic rod (402) and the second telescopic rod (403) to achieve linkage positioning.

7. The air flotation separation device for juvenile razor clams according to claim 6, characterized in that, The movable ends of the telescopic rod one (402) and the telescopic rod two (403) away from the fixed seat (401) are hinged together to the arc-shaped limiting baffle (405). The arc-shaped limiting baffle (405) is rotatably connected to the telescopic rod two (403) through the side limiting pin one (406), and is rotatably connected to the telescopic rod one (402) through the side limiting pin two (407).

8. The air flotation separation device for juvenile razor clams according to claim 1, characterized in that, The aeration-type auxiliary screening mechanism (6) includes a mounting base (601), mounting screws (602), mounting holes (603), an air inlet connector (604), a sealing plate (605), microporous ceramic aeration plates (606), an air chamber (607), a check valve (608), an air guide pipe (609), an air volume regulating valve (610), and a Roots blower (611). The aeration-type auxiliary screening mechanism (6) is installed and fixed on the inner side of the bottom of the sorting box (1) and the upper end of the connecting base plate (5). The mounting base (601) is locked and fixed to the bottom wall of the sorting box (1) by mounting screws (602).

9. The air flotation separation device for juvenile razor clams according to claim 8, characterized in that, The air inlet connector (604) is installed through the mounting hole (603) in the middle of the mounting base (601). The air outlet end of the air inlet connector (604) is connected to a sealing plate (605). The microporous ceramic aeration plate (606) is fixedly installed above the sealing plate (605). The microporous ceramic aeration plate (606) and the sealing plate (605) together form a sealed air chamber (607). The air inlet connector (604) is connected to the bottom of the sealing plate (605) and communicates with the air chamber (607).

10. The air flotation separation device for juvenile razor clams according to claim 9, characterized in that, The lower end of the air inlet connector (604) is sequentially connected to a check valve (608), an air guide pipe (609), and an air volume regulating valve (610). The air volume regulating valve (610) is nested and installed at the connection position between the outer wall of the sorting box (1) and the air guide pipe (609). The end of the air guide pipe (609) is connected to the air outlet of the Roots blower (611). Control levers (7) are fixedly installed on both sides of the outside of the sorting box (1).

Images