An anti-fouling fish egg, larva and juvenile fish survey device

Abstract

The present invention discloses an anti-pollution fish egg and larval fish survey device, which relates to the technical field of anti-pollution fish egg and larval fish surveys and includes a trawl net body. The anti-pollution fish egg and larval fish survey device disclosed by the present invention has the following functions: when collecting fish eggs and larval fish through the trawl net body, the filter screen is used to block garbage, thereby preventing garbage from entering the inside of the trawl net body and causing blockage, avoiding mechanical damage to fish eggs and larval fish caused by the presence of garbage, and at the same time reducing the difficulty of subsequent separation work after collecting fish egg and larval fish samples. During the process of the filter screen blocking garbage, the driving motor can be started, and the driving motor drives each pushing piece to circularly push the garbage inside the filter screen, avoiding the accumulation of fish eggs and larval fish in the filter screen due to the presence of garbage. When the trawl net body has been used for a period of time, the hydraulic cylinder 1 is adjusted to drive the ejecting circular plate to push the filter screen, thereby turning the filter screen over, and the driving motor drives the pushing piece to rotate, quickly realizing the effect of discharging the garbage in the filter screen.

Description

Technical Field

[0001] The present invention relates to the technical field of antifouling fish egg and larva investigation, and particularly to an antifouling fish egg and larva investigation device. Background Art

[0002] Fishery resources are a kind of biological resources, referring to the aquatic biological resources with fishing, mining or aquaculture value in natural waters. Aquatic biological resources can be divided into three parts: population resources, genetic resources and product resources. Fishery resources usually refer to the population resources in aquatic biological resources, which are the material basis for the development of the aquaculture industry and also an important source of human food, providing a large amount of high-quality protein for humans. Fishery resources are renewable resources. Their dynamics and changes, in addition to being affected by fishing, also depend on the strength of their generations, and the strength of generations depends to a large extent on the recruitment status of their early life stages. Fish eggs and larvae are important stages in the early life history of fishery resources, which largely determine the recruitment status of resources. The research on fish eggs and larvae is also one of the essential tasks in the research on the sustainable utilization of fishery resources. Most marine teleosts are oviparous species, and most oviparous fish produce pelagic eggs, and the eggs drift with the waves in the open sea or coastal waters. Therefore, in fishery resource surveys, a plankton net is needed to conduct surface trawl sampling of fish eggs and larvae in the sea area to study their species composition and quantity distribution characteristics.

[0003] During the use of existing antifouling fish egg and larva investigation devices, when collecting fish eggs and larvae through trawling, marine debris easily enters the inside of the trawl through the open end of the trawl, which will cause blockage inside the trawl. At the same time, when marine debris and fish eggs and larvae are in the same space for a long time, it is easy to cause mechanical damage to the fish eggs and larvae, and at the same time increase the difficulty of subsequent separation work of fish egg and larva samples, resulting in the lack of use value of existing fish egg and larva investigation devices. Summary of the Invention

[0004] The present invention discloses an antifouling fish egg and larva investigation device, aiming to solve the technical problem that during the use of existing antifouling fish egg and larva investigation devices, when collecting fish eggs and larvae through trawling, marine debris easily enters the inside of the trawl through the open end of the trawl, which will cause blockage inside the trawl. At the same time, when marine debris and fish eggs and larvae are in the same space for a long time, it will cause mechanical damage to the fish eggs and larvae and increase the difficulty of subsequent sample separation work.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] An anti-pollution fish egg and larval fish investigation device, comprising a trawl net body. An outer mounting ring plate is provided on the outer side of the trawl net body at the open end, and a garbage blocking component is arranged inside the trawl net body. The garbage blocking component includes a filter screen and an inner support ring, and the inner support ring is arranged inside the trawl net body. A fixed ring is fixedly connected to the outer side of the outer mounting ring plate facing the inside of the trawl net body. Connecting spring rods are annularly distributed on the outer side of the fixed ring facing the filter screen, and the other ends of the connecting spring rods are all arranged on the outer side of the filter screen. Two connecting frames are fixedly connected to the inner support ring, and the outer sides of the two connecting frames are fixedly connected to the same motor plate. A hydraulic cylinder I is fixedly connected to the side of the motor plate away from the filter screen, and a push plate is fixedly connected to the output end of the hydraulic cylinder I. A driving motor is fixedly connected to the side of the push plate facing the filter screen. The output shaft of the driving motor is fixedly connected to a rotating shaft through a coupling, and the other end of the rotating shaft is fixedly connected to a top-out circular plate. Outer expansion blocks are annularly arranged on the outer side of the rotating shaft close to the top-out circular plate, and a pushing piece is fixedly connected to the other end of each outer expansion block.

[0007] By providing a garbage blocking component, when collecting fish eggs and larval fish through the trawl net body, the filter screen is used to block garbage, thereby preventing garbage from entering the inside of the trawl net body and causing blockage, and avoiding the existence of garbage from squeezing the living space of fish eggs and larval fish. During the process of the filter screen blocking garbage, the driving motor is started, and the driving motor drives each pushing piece to annularly push the garbage on the inner side of the filter screen, avoiding the existence of garbage from causing fish eggs and larval fish to be piled up in the filter screen. When the trawl net body is used for a period of time, the hydraulic cylinder I is adjusted to drive the top-out circular plate to push the filter screen, so as to turn the filter screen over, and the driving motor drives the pushing piece to rotate, quickly realizing the discharge of the garbage in the filter screen, thereby improving the use value of the investigation device.

[0008] In a preferred solution, a passing volume limiting component is annularly distributed on the outer side of the outer mounting ring plate away from the trawl net body. The passing volume limiting component includes a connecting shaft. Fixed plates are fixedly connected to the outer sides of the outer mounting ring plate close to both ends of each connecting shaft, and both ends of the connecting shaft are connected to the opposite sides of every two adjacent fixed plates through bearings.

[0009] In a preferred solution, an intercepting plate is fixedly connected to the outer side of the connecting shaft close to the opening of the trawl net body, and extending intercepting rods are fixedly connected to both sides of the intercepting plate at equal distances. A bearing plate is fixedly connected to the outer side of the connecting shaft away from the opening of the trawl net body.

[0010] In a preferred solution, a connecting block is fixedly connected to the outer side of the outer mounting ring plate close to each bearing plate, and a pressing spring rod is fixedly connected to the outer side of each connecting block. The other end of the pressing spring rod is fixedly connected to the outer side of the adjacent bearing plate.

[0011] By setting a through - volume limiting component, when collecting fish eggs and larvae through the trawl body, the net plate composed of each intercepting plate and the extended intercepting rod blocks larger garbage, preventing it from entering the filter screen inside the trawl body, ensuring that fish eggs and larvae can pass through the filter screen and enter the inside of the trawl body. At the same time, when the water body squeezes the pressure - bearing plate, the compression spring rod is passively compressed, then the connecting shaft deflects, driving the intercepting plate to flip, increasing the probability that the large - volume garbage on the intercepting plate is carried away by the water flow.

[0012] In a preferred solution, an auxiliary component is provided on the outer side of the trawl body, and the auxiliary component includes a lower connecting ring and a plurality of mounting blocks. The mounting blocks are all fixedly connected to the outer side of the outer mounting ring plate, and the lower connecting ring is arranged on the outer side of the trawl body near the discharging end.

[0013] In a preferred solution, a sliding rail is fixedly connected to the outer side of each mounting block, and the other end of each sliding rail is fixedly connected to the outer side of the lower connecting ring. A limiting slider is slidably connected inside each sliding rail, and a bent sliding plate is fixedly connected to the outer side of each limiting slider.

[0014] In a preferred solution, two mounting grooves are opened on the outer side of the bent sliding plate facing the trawl body, and the two mounting grooves are distributed at both ends of the sliding rail. Hydraulic cylinders II are fixedly connected inside the two mounting grooves, and the output ends of the two hydraulic cylinders II are fixedly connected with arc - surface extrusion columns. The arc - surface extrusion columns are in contact with the outer side of the trawl body. A pull rod is fixedly connected to the outer side of the bent sliding plate away from the trawl body, and a partial protection piece is fixedly connected to the outer side of the bent sliding plate near the pull rod. A plurality of partial protection pieces are annularly distributed on the outer side of the trawl body.

[0015] By setting the auxiliary component, when discharging fish eggs and larvae inside the trawl body, a person pulls the pull rod, thereby driving the limiting slider to slide in the sliding rail. During the sliding process, the hydraulic cylinder II is adjusted to drive the arc - surface extrusion column to extrude the trawl body, so that the fish eggs and larvae attached to the inside of the trawl body can slide down smoothly, improving the convenience of discharging fish eggs and larvae. At the same time, the partial protection pieces on the outer sides of the bent sliding plates play a certain protection effect on the local positions of the trawl body.

[0016] In a preferred solution, a discharging hole is opened on the outer side of the trawl body far from the opening, and a discharge pipe is fixedly connected inside the discharging hole. A pipe valve is connected to the outer side of the discharge pipe through a flange.

[0017] In a preferred embodiment, a blanking anti-blocking assembly is provided inside the trawl body near the discharge pipe. The blanking anti-blocking assembly includes an annular inner rod installed on the inner side of the trawl body near the discharge pipe. A straight connecting rod is fixedly connected to the annular inner rod. A forward and reverse motor is fixedly connected to the outer side of the straight connecting rod away from the discharge pipe. The output shaft of the forward and reverse motor is fixedly connected to a dredging rod through a coupling. The dredging rod is located inside the discharge pipe, and dredging blades are annularly distributed on the outer side of the dredging rod inside the discharge pipe.

[0018] In a preferred embodiment, a fitting piece is fixedly connected to the outer side of the annular inner rod facing the discharge pipe, and the fitting piece is in contact with the inner wall of the trawl body. Two fixing blocks are fixedly connected to the side of the straight connecting rod away from the discharge pipe, and the same diversion protection piece is fixedly connected to the outer sides of the two fixing blocks. The diversion protection piece is located outside the forward and reverse motor.

[0019] By providing the blanking anti-blocking assembly, during the operation of blanking fish eggs and larvae, the forward and reverse motor is started to drive each dredging blade on the outer side of the dredging rod to flip the inner side of the discharge pipe, thereby preventing fish eggs and larvae from being blocked in the discharge pipe and causing the fish eggs and larvae to be unable to be discharged smoothly. At the same time, the annular inner rod and the fitting piece support the inner side of the trawl body near the discharge pipe to prevent it from bending and causing the fish eggs and larvae to be unable to pass through.

[0020] As can be seen from the above, a pollution-proof fish egg and larva investigation device provided by the present invention has the following functions: when collecting fish eggs and larvae through the trawl body, the filter screen is used to block garbage, thereby preventing garbage from entering the inside of the trawl body and causing blockage, and avoiding mechanical damage to fish eggs and larvae caused by the presence of garbage. During the process of the filter screen blocking garbage, the drive motor is started, and the drive motor drives each pushing blade to annularly push the garbage inside the filter screen, avoiding the fish eggs and larvae being piled up in the filter screen due to the presence of garbage. When the trawl body has been used for a period of time, the hydraulic cylinder 1 is adjusted to drive the ejecting circular plate to push the filter screen, thereby turning the filter screen over, and the drive motor drives the pushing blade to rotate, quickly realizing the technical effect of discharging the garbage in the filter screen. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 FIG. is a schematic diagram of the overall structure of a pollution-proof fish egg and larva investigation device proposed by the present invention.

[0022] Figure 2 FIG. is the front view of the overall structure of a pollution-proof fish egg and larva investigation device proposed by the present invention.

[0023] Figure 3 FIG. is a schematic diagram of the garbage blocking assembly of a pollution-proof fish egg and larva investigation device proposed by the present invention.

[0024] Figure 4 isFigure 3 Cross-sectional view of the middle filter structure.

[0025] Figure 5 Schematic diagram of the traveling volume limiting component of an anti-pollution fish egg and larval fish investigation device proposed by the present invention.

[0026] Figure 6 Enlarged view of the combined structure of the intercepting plate and the bearing plate of an anti-pollution fish egg and larval fish investigation device proposed by the present invention.

[0027] Figure 7 Schematic diagram of the auxiliary component of an anti-pollution fish egg and larval fish investigation device proposed by the present invention.

[0028] Figure 8 is Figure 7 schematic plan view of.

[0029] Figure 9 Schematic diagram of the blanking anti-blocking component of an anti-pollution fish egg and larval fish investigation device proposed by the present invention.

[0030] In the figure: 1, trawl body; 2, pipe valve; 3, discharge pipe; 4, garbage blocking component; 401, filter screen; 402, inner support ring; 403, drive motor; 404, motor plate; 405, push piece; 406, connecting frame; 407, fixing ring; 408, connecting spring rod; 409, ejecting round plate; 410, hydraulic cylinder 1; 411, ejecting plate; 412, rotating shaft; 5, outer mounting ring plate; 6, auxiliary component; 601, curved sliding plate; 602, local protection piece; 603, sliding rail; 604, pull rod; 605, lower connecting ring; 606, limit slider; 607, mounting block; 608, arc-shaped extrusion column; 609, hydraulic cylinder 2; 7, traveling volume limiting component; 701, bearing plate; 702, connecting shaft; 703, pressing spring rod; 704, connecting block; 705, intercepting plate; 706, fixing plate; 707, extending intercepting rod; 8, blanking anti-blocking component; 801, annular inner rod; 802, straight connecting rod; 803, fixing block; 804, guiding protection piece; 805, forward and reverse motor; 806, fitting piece; 807, dredging rod; 808, dredging piece. Detailed implementation manners

[0031] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments.

[0032] An anti-pollution fish egg and larva investigation device disclosed by the present invention is mainly applied to the scenario where in the process of using the existing anti-pollution fish egg and larva investigation device, when collecting fish eggs and larvae through a trawl net, marine garbage easily enters the inside of the trawl net through the open end of the trawl net, which will cause blockage inside the trawl net. At the same time, when marine garbage and fish eggs and larvae are in the same space for a long time, it will cause greater pollution and harm to the fish eggs and larvae.

[0033] Refer to Figures 1-9 , an anti-pollution fish egg and larva investigation device, including a trawl net body 1. An outer mounting ring plate 5 is provided on the outside of the trawl net body 1 at the open end. A garbage blocking component 4 is provided inside the trawl net body 1. The garbage blocking component 4 includes a filter screen 401 and an inner support ring 402. The inner support ring 402 is arranged inside the trawl net body 1. A fixed ring 407 is fixedly connected to the outside of the outer mounting ring plate 5 facing the inside of the trawl net body 1. Connecting spring rods 408 are annularly distributed on the outside of the fixed ring 407 facing the filter screen 401. The other ends of the connecting spring rods 408 are all arranged on the outside of the filter screen 401. Two connecting frames 406 are fixedly connected to the inner support ring 402. The outside of the two connecting frames 406 is fixedly connected to the same motor plate 404. A hydraulic cylinder 410 is fixedly connected to the side of the motor plate 404 away from the filter screen 401. The output end of the hydraulic cylinder 410 is fixedly connected to a push plate 411. A driving motor 403 is fixedly connected to the side of the push plate 411 facing the filter screen 401. The output shaft of the driving motor 403 is fixedly connected to a rotating shaft 412 through a coupling. The other end of the rotating shaft 412 is fixedly connected to a top-out circular plate 409. Outer expansion blocks are annularly arranged on the outside of the rotating shaft 412 close to the top-out circular plate 409. The other end of each outer expansion block is fixedly connected to a pushing piece 405.

[0034] In a more specific application scenario, when collecting fish eggs and larvae through the trawl net body 1, the filter screen 401 is used to block garbage, so as to prevent garbage from entering the inside of the trawl net body 1 and causing blockage, and avoid the existence of garbage squeezing the living space of fish eggs and larvae. During the process of the filter screen 401 blocking garbage, the driving motor 403 is started. The driving motor 403 drives each pushing piece 405 to annularly push the garbage on the inner side of the filter screen 401, so as to avoid the existence of garbage causing fish eggs and larvae to be piled up in the filter screen 401. When the trawl net body 1 is used for a period of time, the hydraulic cylinder 410 is adjusted to drive the top-out circular plate 409 to push the filter screen 401, so as to turn the filter screen 401 over. The driving motor 403 drives the pushing piece 405 to rotate, quickly realizing the discharge of the garbage in the filter screen 401, and further improving the use value of the investigation device.

[0035] Refer to Figure 1 、 Figure 2 、 Figure 5 and Figure 6, in a preferred embodiment, a traveling volume limiting assembly 7 is annularly distributed on the outer side of the outer mounting ring plate 5 away from the trawl body 1, and the traveling volume limiting assembly 7 includes a connecting shaft 702. Fixing plates 706 are fixedly connected to the outer sides of the outer mounting ring plate 5 near both ends of each connecting shaft 702. Both ends of the connecting shaft 702 are connected to the opposite sides of every two adjacent fixing plates 706 through bearings. An intercepting plate 705 is fixedly connected to the outer side of the connecting shaft 702 near the opening of the trawl body 1, and extending intercepting rods 707 are fixedly connected to both sides of the intercepting plate 705 at equal distances. A bearing plate 701 is fixedly connected to the outer side of the connecting shaft 702 away from the opening of the trawl body 1. Connecting blocks 704 are fixedly connected to the outer sides of the outer mounting ring plate 5 near each bearing plate 701, and a pressing spring rod 703 is fixedly connected to the outer side of each connecting block 704. The other end of the pressing spring rod 703 is fixedly connected to the outer side of the adjacent bearing plate 701.

[0036] Specifically, when collecting fish eggs and larvae through the trawl body 1, a net plate composed of each intercepting plate 705 and extending intercepting rods 707 blocks large-volume garbage to prevent it from entering the filter screen 401 inside the trawl body 1, ensuring that fish eggs and larvae can pass through the filter screen 401 and travel into the trawl body 1. At the same time, when the water body presses the bearing plate 701, the pressing spring rod 703 is compressed passively, and the connecting shaft 702 deflects, driving the intercepting plate 705 to flip, increasing the probability that the large-volume garbage on the intercepting plate 705 is carried away by the water flow.

[0037] Refer to Figure 1 、 Figure 2 、 Figure 7 and Figure 8, in a preferred embodiment, an auxiliary component 6 is provided on the outer side of the trawl body 1, and the auxiliary component 6 includes a lower connecting ring 605 and a plurality of mounting blocks 607. The mounting blocks 607 are all fixedly connected to the outer side of the outer mounting ring plate 5. The lower connecting ring 605 is arranged on the outer side of the trawl body 1 near the blanking end. A sliding rail 603 is fixedly connected to the outer side of each mounting block 607, and the other end of each sliding rail 603 is fixedly connected to the outer side of the lower connecting ring 605. A limiting slider 606 is slidably connected inside each sliding rail 603. A curved sliding plate 601 is fixedly connected to the outer side of each limiting slider 606. Two mounting grooves are formed on the outer side of the curved sliding plate 601 facing the trawl body 1, and the two mounting grooves are distributed at both ends of the sliding rail 603. A second hydraulic cylinder 609 is fixedly connected inside each of the two mounting grooves. The output ends of the two second hydraulic cylinders 609 are both fixedly connected with an arc-shaped extrusion column 608. The arc-shaped extrusion column 608 is in contact with the outer side of the trawl body 1. A pull rod 604 is fixedly connected to the outer side of the curved sliding plate 601 away from the trawl body 1. A local protection piece 602 is fixedly connected to the outer side of the curved sliding plate 601 near the pull rod 604. The plurality of local protection pieces 602 are annularly distributed on the outer side of the trawl body 1.

[0038] It should be noted that when discharging fish eggs and larvae inside the trawl body 1, manually pull the pull rod 604, thereby driving the limiting slider 606 to slide in the sliding rail 603. During the sliding process, adjust the second hydraulic cylinder 609 to drive the arc-shaped extrusion column 608 to extrude the trawl body 1, so that the fish eggs and larvae attached to the inside of the trawl body 1 can slide down smoothly, improving the convenience of discharging fish eggs and larvae. At the same time, the local protection pieces 602 on the outer sides of the respective curved sliding plates 601 play a certain protective effect on the local positions of the trawl body 1.

[0039] Refer to Figure 1 and Figure 2 , in a preferred embodiment, a blanking hole is formed on the outer side of the trawl body 1 far from the opening, and a discharge pipe 3 is fixedly connected inside the blanking hole. A pipe valve 2 is connected to the outer side of the discharge pipe 3 through a flange.

[0040] Refer to Figure 1 and Figure 9, in a preferred embodiment, a blanking anti-blocking assembly 8 is provided inside the trawl body 1 near the discharge pipe 3. The blanking anti-blocking assembly 8 includes an annular inner rod 801. The annular inner rod 801 is installed on the inner side of the trawl body 1 near the discharge pipe 3. A straight link 802 is fixedly connected to the annular inner rod 801. A forward and reverse motor 805 is fixedly connected to the outer side of the straight link 802 away from the discharge pipe 3. The output shaft of the forward and reverse motor 805 is fixedly connected to a dredging rod 807 through a coupling. The dredging rod 807 is located inside the discharge pipe 3. Dredging blades 808 are annularly distributed on the outer side of the dredging rod 807 inside the discharge pipe 3. A fitting piece 806 is fixedly connected to the outer side of the annular inner rod 801 facing the discharge pipe 3, and the fitting piece 806 is in contact with the inner wall of the trawl body 1. Two fixing blocks 803 are fixedly connected to one side of the straight link 802 away from the discharge pipe 3. A same diversion protection piece 804 is fixedly connected to the outer sides of the two fixing blocks 803. The diversion protection piece 804 is located outside the forward and reverse motor 805.

[0041] In a more specific application scenario, during the operation of blanking fish eggs and larvae, the forward and reverse motor 805 is started to drive each of the dredging blades 808 on the outer side of the dredging rod 807 to flip the inner side of the discharge pipe 3, so as to prevent the fish eggs and larvae from being blocked in the discharge pipe 3 and causing the fish eggs and larvae to be unable to be discharged smoothly. At the same time, the annular inner rod 801 and the fitting piece 806 support the inner side of the trawl body 1 near the discharge pipe 3 to prevent it from bending and causing the fish eggs and larvae to be unable to pass through.

[0042] Working principle: When in use, when collecting fish eggs and larvae through the trawl body 1, the net plate composed of each intercepting plate 705 and the extended intercepting rod 707 blocks larger garbage to prevent it from entering the filter screen 401 inside the trawl body 1, ensuring that fish eggs and larvae can pass through the filter screen 401 and travel into the trawl body 1. At the same time, the filter screen 401 blocks the garbage, thereby preventing the garbage from entering the trawl body 1 and causing blockage, and avoiding the existence of garbage from squeezing the living space of fish eggs and larvae. During the process of the filter screen 401 blocking the garbage, the driving motor 403 is started, and the driving motor 403 drives each pushing piece 405 to circularly push the garbage inside the filter screen 401 to avoid the existence of garbage causing fish eggs and larvae to be piled up in the filter screen 401. When the trawl body 1 is used for a period of time, the hydraulic cylinder 410 is adjusted to drive the ejecting circular plate 409 to push the filter screen 401, thereby turning the filter screen 401 over. The driving motor 403 drives the pushing piece 405 to rotate, quickly realizing the discharge of the garbage in the filter screen 401. After the collection is completed, the operator pulls the pull rod 604 manually, thereby driving the limit slider 606 to slide in the sliding rail 603. During the sliding process, the hydraulic cylinder 609 is adjusted to drive the arc-shaped extrusion column 608 to extrude the trawl body 1, so that the fish eggs and larvae attached to the inside of the trawl body 1 can slide down smoothly. Then, the forward and reverse motor 805 is started to drive each cleaning piece 808 outside the cleaning rod 807 to turn over the inside of the discharge pipe 3, thereby preventing fish eggs and larvae from being blocked in the discharge pipe 3 and causing the fish eggs and larvae to be unable to be discharged smoothly. After the discharging is completed, they are collected to end the operation.

[0043] The above is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. An anti-fouling fish egg, larva and juvenile fish investigation device, including a trawl net body (1). It is characterized in that an outer mounting ring plate (5) is arranged on the outer side of the trawl net body (1) at the opening end, and a garbage blocking component (4) is arranged inside the trawl net body (1). The garbage blocking component (4) includes a filter screen (401) and an inner support ring (402), and the inner support ring (402) is arranged inside the trawl net body (1). A fixed ring (407) is fixedly connected to the outer side of the outer mounting ring plate (5) facing the inside of the trawl net body (1). Connecting spring rods (408) are annularly distributed on the outer side of the fixed ring (407) facing the filter screen (401), and the other ends of the connecting spring rods (408) are all arranged on the outer side of the filter screen (401). Two connecting frames (406) are fixedly connected to the inner support ring (402), and a same motor plate (404) is fixedly connected to the outer sides of the two connecting frames (406). A hydraulic cylinder I (410) is fixedly connected to the side of the motor plate (404) away from the filter screen (401), and a push plate (411) is fixedly connected to the output end of the hydraulic cylinder I (410). A driving motor (403) is fixedly connected to the side of the push plate (411) facing the filter screen (401). The output shaft of the driving motor (403) is fixedly connected to a rotating shaft (412) through a coupling. The other end of the rotating shaft (412) is fixedly connected to an ejecting circular plate (409). Outer spreading blocks are annularly arranged on the outer side of the rotating shaft (412) close to the ejecting circular plate (409), and a pushing piece (405) is fixedly connected to the other end of each outer spreading block. A travel volume limiting component (7) is annularly distributed on the outer side of the outer mounting ring plate (5) away from the trawl net body (1). The travel volume limiting component (7) includes a connecting shaft (702). Fixing plates (706) are fixedly connected to the outer sides of the outer mounting ring plate (5) close to both ends of each connecting shaft (702). Both ends of the connecting shaft (702) are connected to the opposite sides of every two adjacent fixing plates (706) through bearings. An intercepting plate (705) is fixedly connected to the outer side of the connecting shaft (702) close to the opening of the trawl net body (1), and extending intercepting rods (707) are equidistantly fixedly connected to both sides of the intercepting plate (705). A bearing plate (701) is fixedly connected to the outer side of the connecting shaft (702) away from the opening of the trawl net body (1). Connecting blocks (704) are fixedly connected to the outer sides of the outer mounting ring plate (5) close to each bearing plate (701), and pressing spring rods (703) are fixedly connected to the outer sides of each connecting block (704). The other ends of the pressing spring rods (703) are fixedly connected to the outer side of the adjacent bearing plate (701).

2. The anti-fouling fish egg, larva and juvenile fish investigation device according to claim 1, It is characterized in that An auxiliary component (6) is provided on the outer side of the trawl body (1), and the auxiliary component (6) includes a lower connecting ring (605) and a plurality of mounting blocks (607). The mounting blocks (607) are all fixedly connected to the outer side of the outer mounting ring plate (5), and the lower connecting ring (605) is arranged on the outer side of the trawl body (1) near the blanking end.

3. The anti-pollution fish egg and larval fish investigation device according to claim 2, characterized in that, A sliding rail (603) is fixedly connected to the outer side of each mounting block (607), and the other end of each sliding rail (603) is fixedly connected to the outer side of the lower connecting ring (605). A limiting slider (606) is slidably connected inside each sliding rail (603), and a bent sliding plate (601) is fixedly connected to the outer side of each limiting slider (606).

4. The anti-pollution fish egg and larval fish investigation device according to claim 3, characterized in that, Two mounting grooves are formed on the outer side of the bent sliding plate (601) facing the trawl body (1), and the two mounting grooves are distributed at both ends of the sliding rail (603). Hydraulic cylinders II (609) are fixedly connected inside the two mounting grooves, and the output ends of the two hydraulic cylinders II (609) are fixedly connected with arc-shaped extrusion columns (608). The arc-shaped extrusion columns (608) are in contact with the outer side of the trawl body (1). A pull rod (604) is fixedly connected to the outer side of the bent sliding plate (601) away from the trawl body (1), and a local protection piece (602) is fixedly connected to the outer side of the bent sliding plate (601) near the pull rod (604). A plurality of local protection pieces (602) are annularly distributed on the outer side of the trawl body (1).

5. The anti-pollution fish egg and larval fish investigation device according to claim 1, characterized in that, A blanking hole is formed on the outer side of the trawl body (1) far from the opening, and a discharge pipe (3) is fixedly connected inside the blanking hole. A pipe valve (2) is connected to the outer side of the discharge pipe (3) through a flange.

6. The anti-pollution fish egg and larval fish investigation device according to claim 5, characterized in that, A blanking anti-blocking component (8) is provided on the inner side of the trawl body (1) near the discharge pipe (3), and the blanking anti-blocking component (8) includes an annular inner rod (801). The annular inner rod (801) is installed on the inner side of the trawl body (1) near the discharge pipe (3). A straight connecting rod (802) is fixedly connected to the annular inner rod (801). A forward and reverse motor (805) is fixedly connected to the outer side of the straight connecting rod (802) away from the discharge pipe (3). The output shaft of the forward and reverse motor (805) is fixedly connected with a dredging rod (807) through a coupling. The dredging rod (807) is located inside the discharge pipe (3), and dredging pieces (808) are annularly distributed on the outer side of the dredging rod (807) inside the discharge pipe (3).

7. The anti-pollution fish egg and larval fish investigation device according to claim 6, characterized in that, A fitting piece (806) is fixedly connected to the outer side of the annular inner rod (801) facing the discharge pipe (3), and the fitting piece (806) is attached to the inner wall of the trawl body (1). Two fixing blocks (803) are fixedly connected to the side of the straight connecting rod (802) away from the discharge pipe (3), and the same diversion protection piece (804) is fixedly connected to the outer sides of the two fixing blocks (803). The diversion protection piece (804) is located outside the forward and reverse motor (805).

Images