Euphausia superba net bag fishing harvesting conveying device and conveying method

Abstract

The invention discloses an euphausia superba net bag fishing harvesting conveying device and method, and belongs to the technical field of fishery. The device comprises a fishing boat, a trawl net, a rigid shrimp guide bin, a suspension type water filtering device, a high-pressure pump and a multi-layer detachable collecting box. The rigid shrimp guide bin is hermetically connected with the trawl tail to prevent the loss of shrimp groups; alternate parallel operation of suction enrichment and high-pressure pushing of a shrimp-water mixture is realized by utilizing a parallel structure of the double water filtering devices, and the flow direction of a high-pressure pump is controlled through double pressure outlets and a one-way valve; an echo detector in the water filtering device monitors the enrichment degree; and the multi-layer collecting box realizes layered directional conveying through a valve. According to the method, the water filtering device is controlled to alternately suck and push. According to the invention, damage and escape of shrimp bodies are reduced, the power loss of the fish pump is greatly reduced, continuous operation is realized, and the proportion of shrimp bodies in unit conveying capacity is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of fisheries, and in particular relates to a device and a method for conveying Antarctic krill net bag fish catch. Background Art

[0002] In the continuous fishing operation of Antarctic krill trawling, the transfer of net bag fish is mainly carried out by pump suction system. During the operation, the continuous fishing of Antarctic krill trawling means that while the trawl is being towed to catch Antarctic krill, the catch collected in the trawl net bag is simultaneously transferred to the fishing vessel, thereby achieving continuous fishing and avoiding the need to lift the net. As the main krill conveying equipment, the fish suction pump has a suction range that determines the flow conveying capacity. The larger the suction range, the greater the power loss, which greatly limits the conveying capacity of the fish suction pump.

[0003] In the prior art, the fish suction pumps used in Antarctic krill fishing are typically fixedly mounted on fishing vessels. However, the delivery pipes used for Antarctic krill net bag fishing are long, resulting in significant losses along the way. Furthermore, suction losses at the vessel end significantly reduce the efficiency of the fish suction pumps. Furthermore, the shrimp-water mixture currently transported to the vessel end contains a relatively small proportion of shrimp, and the seawater transported to the vessel end along with the shrimp significantly wastes the operating power of the fish suction pumps. To this end, some researchers have begun to improve Antarctic krill fishing devices, such as CN115769804A, but their structure still has room for improvement. In general, it is crucial to develop an Antarctic krill harvesting and delivery device and method that can enrich Antarctic krill and enable segmented collection. Summary of the Invention

[0004] The purpose of the present invention is to prevent the krill from catching, reduce energy consumption and realize continuous and efficient transportation during the fishing process of Antarctic krill by alternately operating a double water filtration system combining a closed shrimp guide channel, a pre-water filtration device and a high-pressure push. A device for conveying Antarctic krill sac catches includes a fishing vessel, a high-pressure pump and a collection tank fixed to the deck, a trolling line deployed at the stern, a trawl net suspended from the end of the line, and a rigid shrimp guide bin connected to the tail of the trawl net. A first water filter device is suspended below the sea surface at the stern of the fishing vessel. A buoy on top of the first water filter device allows it to remain suspended below the water surface. A first delivery pipe is connected between the first water filter device and the rigid shrimp guide bin, and a second delivery pipe is connected between the collection tank and the first water filter device. A pressure outlet pipe is provided at the inlet of the first water filter device, leading to the high-pressure pump. A first high-pressure check valve is provided at the junction of the pressure outlet pipe and the first delivery pipe, near the rigid shrimp guide bin. This device forms a closed catch channel by directly attaching the rigid shrimp guide bin to the tail of the trawl net, preventing the loss of shrimp caused by traditional open sac nets. The suspended first water filter device at the stern of the fishing vessel moves the initial separation of the shrimp-water mixture closer to the net end. The rigid shrimp guide bin and the water filter device are connected by a first delivery pipe, shortening the suction distance and thus reducing the power loss of the submersible pump. A second delivery pipe is set up to connect the water filtration device and the collection box to achieve the subsequent shrimp transportation steps. The high-pressure pump is connected to the transportation system through the pressure outlet pipe. After the shrimp are enriched in the water filtration device, the positive pressure of the high-pressure pump is used to push instead of the traditional negative pressure suction. The first high-pressure one-way valve only allows seawater to flow out of the rigid shrimp guide tank and does not allow seawater to flow back into the rigid shrimp guide tank through the first delivery pipe. Therefore, the flow direction is controlled by the first high-pressure one-way valve, which not only prevents seawater backflow but also improves the efficiency of shrimp transportation. This structure processes the shrimp-water mixture in stages, first separating it near the field and then transporting it remotely, effectively reducing the resistance loss along the way and increasing the proportion of shrimp in the unit transportation volume.

[0005] A device for conveying Antarctic krill nets and sacs. The first water filtration device includes a cylindrical filter and a drainage chamber at the bottom. The drainage chamber is connected to the cylindrical filter and contains a submersible pump. The submersible pump continuously draws shrimp from the rigid shrimp guide bin into the cylindrical filter. The submersible pump also draws water from the cylindrical filter, drawing the shrimp into the filter, ultimately concentrating them there.

[0006] An Antarctic krill net bag fishing conveying device, wherein the mesh size of the cylindrical filter is between 3 and 3.5 cm, so that the juvenile krill in the cylindrical filter can be discharged from the drainage chamber and released, and only the larger Antarctic krill are collected.

[0007] A device for conveying Antarctic krill net bag fish catches, comprising a second water filter device disposed adjacent to a first water filter device, a first delivery pipe further comprising a first hose branch channel leading to the second water filter device, a high-pressure pump further comprising a secondary pressure outlet pipe connected to the first hose branch channel, and two pressure outlet ports, one connected to the pressure outlet pipe and the other to the secondary pressure outlet pipe. The internal structure of the second water filter device is identical to that of the first water filter device, and a second high-pressure one-way valve is disposed within the first hose branch channel. By adding a second water filter device and a matching bidirectional delivery system, alternating parallel operations of water filtration and delivery are achieved. The second water filter device is arranged to form a parallel structure with the first water filter device, with the first hose branch channel and the secondary pressure outlet pipe forming a second delivery channel, enabling the high-pressure pump to separately provide pressure to the two water filter devices. The dual-pressure outlet design enables the high-pressure pump to independently control the pressure output of the two systems. The second high-pressure one-way valve ensures one-way flow within the first hose branch. Similarly, the third high-pressure one-way valve in the second delivery pipe and the fourth high-pressure one-way valve in the second hose branch also ensure one-way flow between the first hose branch and the second delivery pipe. The two water filtration devices have the same structure to ensure the symmetry and interchangeability of system operation. This solution uses two sets of water filtration devices to alternately perform suction enrichment and pressure pushing. While one device is pushing the catch, the other device can simultaneously pump and process the shrimp-water mixture, thereby eliminating the downtime waiting time in traditional single-system operations and reducing the continuous workload of the fish suction pump. At the same time, the single push distance is shortened by diverting the delivery, reducing pressure loss along the way.

[0008] A device for conveying Antarctic krill net bag catches includes a collection box comprising detachable collection layers arranged from top to bottom, with drainage pipes connecting the collection layers. A second conveying pipe is connected to each collection layer via pipes equipped with valves. The detachable multi-layer collection structure optimizes the catch processing process. The design of the collection layers arranged vertically implements a layered storage function. The detachable structure facilitates dynamic adjustment of the collection capacity based on the catch volume, while supporting independent loading and unloading operations at different levels, improving operational continuity. The drainage pipes between the collection layers form a water flow interconnection system. When the water level in the upper collection layer is too high, it can flow into the lower collection layer through the drainage pipe. The second conveying pipe connects the collection layers through pipes and is equipped with valves, forming a switchable conveying path control mechanism. The operator can select a specific collection layer for directional conveying based on the real-time fishing situation, avoiding energy loss caused by ineffective circulation. This modular collection system not only ensures the batch collection of Antarctic krill, but also enables the flexible expansion of collection capacity, effectively solving the problems of low separation efficiency and operation interruption existing in traditional single collection devices.

[0009] An Antarctic krill net bag fish harvesting and conveying device, in which the holding volume of a single collecting layer is larger than the holding volume of the first water filtration device. By limiting the holding volume of a single collecting layer to exceed the capacity of the first water filtration device, it is ensured that each collecting layer can fully accommodate the amount of fish harvested after a single treatment by the water filtration device. This design provides the collecting layer with sufficient space to carry the shrimp-water mixture in the water filtration device, avoiding multiple switching of the collecting layer or interruption of the conveying process due to insufficient collection layer capacity. When the water filtration device completes the collection, the harvest accumulated inside it can all enter a single collecting layer at once, which not only maintains the rhythm of continuous fishing operations, but also reduces the frequency of switching between the collecting layers, thereby effectively improving the efficiency of fish harvest transfer and reducing the idling time of the equipment. At the same time, this technical feature forms a synergistic effect with the detachable collection layer structure, and realizes the synchronization of the operating rhythm between the water filtration device and the collection box through physical capacity matching.

[0010] An Antarctic krill net bag fishing conveying device, the collection layer includes a first collection layer, a second collection layer, a third collection layer, and a fourth collection layer, which are installed in parallel from top to bottom. The first collection layer, the second collection layer, the third collection layer, and the fourth collection layer are detachably mounted on a fixed frame, and the fixed frame is connected to various pipes and ultimately connected to the second conveying pipe; the inlet of the first collection layer is provided with a valve No. 1; the inlet of the second collection layer is provided with a valve No. 2; the inlet of the third collection layer is provided with a valve No. 3; and the inlet of the fourth collection layer is provided with a valve No. 4. By setting up a multi-layer independently controlled collection layer structure, hierarchical collection and dynamic adjustment functions are achieved. The collection layer is divided into four independent levels in an up-and-down arrangement, and each level is equipped with a dedicated valve. According to the volume and enrichment state of the shrimp-water mixture conveyed by the water filtration device, the corresponding collection layer can be selected to open for directional filling. The sequential arrangement of the first to fourth collection layers allows for the gradual activation of different collection tank levels according to the operational phase, avoiding frequent switching due to insufficient capacity on a single layer. The independent control of each inlet valve ensures both airtight isolation of the shrimp-water mixture within a single collection layer and, when a layer is fully loaded, shuts off the pipeline by closing the corresponding valve while simultaneously opening the valve on the next layer to maintain continuous delivery. This modular, layered structure reduces the path length and pump pressure required for a single delivery. By storing water in stages and areas, it reduces ineffective seawater circulation during the collection process. Drain valves are used to remove excess seawater from the collection layer, ensuring that the water level does not accumulate unsatisfactorily.

[0011] An Antarctic krill net bag fish harvesting and conveying device, wherein the first water filtration device and the second water filtration device are provided with echo detectors. By adding echo detectors to the first water filtration device and the second water filtration device, real-time monitoring of the enrichment level of the catch inside the device is achieved. The core of this technical means is to use acoustic detection technology to dynamically obtain the distribution density and stacking height of Antarctic krill in the water filtration device, so as to accurately judge the completion time of the suction stage. The echo detector can penetrate the seawater and the filter structure, and directly sense the spatial distribution state of the shrimp group in the cylindrical filter, avoiding the lag of traditional manual experience judgment. When the shrimp group in the device reaches the preset enrichment threshold, the detector can trigger the submersible pump shutdown command to ensure that the start timing of the high-pressure pump push stage matches the material quantity. At the same time, the design of parallel detection of the dual water filtration devices solves the blind spot problem that may exist in the monitoring of a single device, and guarantees the independent monitoring requirements of each water filtration device during the alternating operation.

[0012] A method for transporting Antarctic krill net bag fish catch, comprising: Suction: Start the submersible pump at the bottom of the first water filter to suck the shrimp and seawater from the trawl; Pushing: After the shrimps are enriched in the first water filter, turn off the submersible pump and turn on the high-pressure pump to push the shrimps and seawater accumulated in the first water filter into the collection tank through the pressure output pipe; Cycle: Repeat the suction and push steps until the collection box collects the last collection before proceeding to the next step; End: Turn off the high pressure pump.

[0013] By controlling the suction and push modes in stages, the catch delivery process is optimized. A submersible pump initially pumps and concentrates the shrimp-water mixture, followed by a high-pressure pump that applies targeted pressure to the concentrated shrimp, reducing fluid resistance during long-distance delivery. This division of labor between the submersible and high-pressure pumps avoids power loss caused by continuous high-load operation of a single device, while also increasing shrimp concentration through the water filtration unit's enrichment function and reducing the amount of ineffective seawater delivered.

[0014] A method for transporting Antarctic krill net bag fish catch, comprising: Primary suction: start the submersible pumps in the first and second water filtration devices to suck the shrimp and seawater in the trawl; One-time push: Wait until the shrimp are fully enriched in the first and second water filtration devices, turn off the submersible pumps in the first and second water filtration devices, open the outlet pipe connected to the outlet port of the high-pressure pump, and the high-pressure pump pushes the shrimp in the first water filtration device to the collection box through the outlet pipe; Primary synchronization: The high-pressure pump outlet is switched from the outlet pipe to the auxiliary outlet pipe. The high-pressure pump pushes the shrimp in the second water filter device to the collection tank through the auxiliary outlet pipe. At the same time, the submersible pump in the first water filter device is turned on to suck the shrimp and seawater from the trawl net. Secondary synchronization: Wait until the shrimp are enriched in the first water filter and all the shrimp in the second water filter are pushed into the collection box. Then, turn off the submersible pump in the first water filter and switch the high-pressure pump from the outlet of the auxiliary pressure outlet pipe to the outlet of the pressure outlet pipe. The high-pressure pump pushes the shrimp in the first water filter into the collection box through the pressure outlet pipe. Synchronous closing: During the second synchronous execution, the submersible pump in the second water filtration device is turned on to start pumping out the shrimp and seawater from the trawl; Loop: Repeat the steps of first synchronization, second synchronization, and synchronization end until the collection box performs the last collection work and then executes the next step; End: Execute the first and second synchronization steps, and turn off the high-pressure pump after all the shrimps in the first water filter device have entered the collection box.

[0015] The alternating operation of the dual water filtration devices enables seamless continuous fishing. First, the initial suction efficiency is improved by synchronously starting the dual water filtration devices. After the two devices have completed the enrichment of the catch, the catch stored in the first water filtration device is directed to the collection box through the directional switching of the high-pressure pump outlet. Then, during the pushing process, the other water filtration device is synchronously started for the next round of suction, forming an overlap of the production rhythm. When the second water filtration device is pushed, the device functions are interchanged through the reverse switching of the outlet, while keeping at least one water filtration device in the suction operation state at all times. By cyclically executing this alternating workflow, the waiting time of the water filtration and pushing links in the traditional single-pump system is effectively avoided, so that the high-pressure pump is always in an effective working state. Finally, by setting the process termination conditions, the integrity of the last round of operations and the safety of system shutdown are ensured. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other implementation drawings based on the provided drawings without inventive effort.

[0017] Figure 1 It is a schematic diagram of the overall device of the present invention.

[0018] Figure 2 Schematic diagram of the water filtration device of the present invention.

[0019] Figure 3 It is a side view of the water filtering device of the present invention.

[0020] Figure 4 This is a schematic diagram of the pipeline setting principle of Example 2 of the present invention.

[0021] Figure 5 This is a schematic diagram of the internal pipe connections of the collection box of the present invention.

[0022] Description of the drawings: 1-fishing boat, 11-trawling line, 12-high-pressure pump, 13-trawl net, 21-rigid shrimp guide bin, 32-first delivery pipe, 33-second delivery pipe, 34-pressure outlet pipe, 34b-auxiliary pressure outlet pipe, 35a-first high-pressure one-way valve, 35b-second high-pressure one-way valve, 35c-third high-pressure one-way valve, 35d-fourth high-pressure one-way valve, 36-first hose branch, 37-second hose branch, 41-first A water filtering device, 41b-cylindrical filter, 41c-drainage chamber, 42-second water filtering device, 43-submersible pump, 5-collecting box, 51-collecting layer, 51a-first collecting layer, 51b-second collecting layer, 51c-third collecting layer, 51d-fourth collecting layer, 52-drainage pipe, 53-fixed frame, 61-valve No. 1, 62-valve No. 2, 63-valve No. 3, 64-valve No. 4, 65-drainage valve. DETAILED DESCRIPTION

[0023] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0024] The following first describes the concepts involved in this application with reference to the accompanying drawings. It should be noted that the following description of each concept is intended only to make the content of this application easier to understand and does not limit the scope of protection of this application. At the same time, the embodiments and features in the embodiments of this application can be combined with each other unless there is a conflict. The following detailed description of this application will be made with reference to the accompanying drawings and in conjunction with the embodiments.

[0025] Example 1: Basic workflow (single water filtration device) Background and system status: Refer to the attached Figure 1 , Attachment Figure 5As shown, fishing vessel 1 lowers its trawling line 11 and trawl net 13 into the sea. After completing a catch of Antarctic krill, the trawl net 13 is filled with a mixture of krill and water. The tail of the trawl net 13 is attached to a rigid shrimp guide hopper 21. A first water filtration device 41, suspended underwater at the stern, is connected to the rigid shrimp guide hopper 21 via a first delivery pipe 32 and to a collection tank 5 mounted onboard (initially, a collection layer 51 is selected and its inlet valve is open) via a second delivery pipe 33. The high-pressure pump 12, the submersible pump 43 at the bottom of the water filtration device, and the corresponding one-way valve are all closed.

[0026] Operation process: refer to the attached Figure 1 , Attachment Figure 2 , Attachment Figure 3 , Attachment Figure 5 As shown, the submersible pump 43 at the bottom of the first water filtration device 41 is first activated. Using negative pressure, the shrimp-water mixture in the net bag is pumped through the rigid shrimp guide 21 and the first delivery pipe 32 into the cylindrical filter 41b of the first water filtration device 41 for initial enrichment (juvenile shrimp can pass through the mesh opening and be discharged). When the internal echo sounder detects that the shrimp have reached a predetermined density, the submersible pump 43 is shut off. The high-pressure pump 12 is then activated, injecting high-pressure water into the first water filtration device 41 through the outlet pipe 34. The first high-pressure check valve 35a prevents backflow of the high-pressure water. The high-pressure water carries the shrimp, enriched and largely free of seawater, through the second delivery pipe 33 to a selected collection layer 51 (e.g., the fourth collection layer 51d), where they are collected. After a single delivery, the system returns to its initial state (the first water filtration device 41 is unloaded), and another level of the collection tank 5 can be selected as needed (via a valve). The cycle of suction, enrichment, and high-pressure delivery is repeated until the harvesting batch is complete. This process prevents shrimps from escaping at the net entrance through the rigid shrimp guide bin 21; the front first water filter device 41 greatly reduces the invalid seawater that needs to be transported over long distances, reducing the suction load and energy consumption of the submersible pump 43; the enriched shrimp groups are pushed using high-pressure positive pressure, which significantly improves the transportation efficiency; the layered collection box 5 structure facilitates orderly management.

[0027] Refer to the attached Figure 5As shown, the number of collection layers 51 in the collection box 5 is not limited to four. This embodiment uses four collection layers as an example. Preferably, each collection layer 51 within the collection box 5 has a water level sensor to prevent seawater from overflowing and accumulating. The valves within the collection box 5 are controlled by the computer control system on the fishing vessel 1. The collection order within the collection box 5 can be as follows: fourth collection layer 51d, third collection layer 51c, second collection layer 51b, and first collection layer 51a. When the high-pressure pump 12 first delivers shrimp water from the first water filtration device 41 to the collection box 5, valve No. 4 64 is opened to allow the shrimp water to enter the fourth collection layer 51d. The drain valve 65 is controlled to maintain the water level in the fourth collection layer 51d. Once the echo sounder in the first water filtration device 41 detects that the shrimp have left, the high-pressure pump 12 and valve No. 4 64 are shut off to prepare for the next operation. Each time a shrimp-water mixture is collected from a collection layer, the corresponding inlet valve is opened. When the high-pressure pump 12 pushes for the second time, valve 3 63 is opened to allow the shrimp water to enter the third collection layer 51c. Subsequently, valve 2 62 and valve 1 61 are opened in sequence. While a collection layer 51 is collecting shrimp water, the staff can simultaneously remove the other collection layers 51 that have collected shrimp water and install a new empty collection layer 51.

[0028] Example 2: Basic working process (double water filtration device) Refer to the attached Figure 1 , Attachment Figure 4 As shown, fishing vessel 1 lowers its trawling line 11 and trawl net 13 into the sea. After a single haul, the net 13 is filled with a mixture of shrimp and water. The tail of trawl net 13 is connected to a rigid shrimp guide hopper 21. A first water filter 41 and a second water filter 42 (each containing an echo sounder and a cylindrical filter 41b) are suspended in parallel underwater at the stern. Both are connected to the rigid shrimp guide hopper 21 via a first delivery pipe 32 and a first hose branch 36 (containing a second high-pressure check valve 35b). The high-pressure pump 12 is equipped with two outlets: a main outlet pipe 34 connected to the inlet of the first water filter 41, and a secondary outlet pipe 34b connected to the inlet of the second water filter 42. The submersible pumps 43 at the bottom of both devices are off. Initially, valve 64 of the collection tank 5 is open, selecting the fourth collection layer 51d.

[0029] Step 1: Refer to the attached Figure 2 , Attachment Figure 3 As shown, the submersible pumps 43 at the bottom of the two water filtration devices are activated, using negative pressure to simultaneously pump the shrimp-water mixture in the net bag through the rigid shrimp guide bin 21 to the two sets of cylindrical filter screens 41b. The seawater and juvenile shrimp are discharged from the mesh, and the adult shrimp are enriched in the two tanks.

[0030] Step 2: Refer to the attached Figure 4 , Attachment Figure 5As shown, when the echo sounder in the first water filter 41 detects that the shrimp population has reached a certain level, its submersible pump 43 is shut down and the main outlet of the high-pressure pump 12 is opened. High-pressure water flows through the main outlet pipe 34, pushing the shrimp in the first water filter 41 through the second delivery pipe 33 to the fourth collection layer 51d (valve 64 is open). The first high-pressure check valve 35a prevents backflow. Simultaneously, the submersible pump 43 in the second water filter 42 continues to operate, pumping in new shrimp water.

[0031] Step 3: Refer to the attached Figure 4 As shown, when the echo detector in the second water filtration device 42 detects that the enrichment meets the standard: its submersible pump 43 is closed, and the high-pressure pump 12 is switched to the auxiliary pressure outlet. The high-pressure water flows through the auxiliary pressure outlet pipe 34b to push the shrimp balls in the second water filtration device 42 to the collection box 5 (at this time, the No. 3 valve 63 is switched to open the third collection layer 51c), and at the same time, the submersible pump 43 of the first water filtration device 41 is restarted for suction.

[0032] Step 4: Refer to the attached Figure 4 , Attachment Figure 5 As shown, steps 2-3 are repeated to form a closed loop alternating operation. When a collection layer 51 is full, the valve is switched to enable the next layer. After the final round of pushing is completed, the high-pressure pump 12 and all submersible pumps 43 are turned off, and all valves in the collection box 5 are closed.

[0033] Refer to the attached Figure 5 As shown, the collection layers 51 of the collection box 5 operate in the same manner as in Example 1: valve 4 64 (fourth collection layer 51d) is first opened, followed by valve 3 63 (third collection layer 51c), and so on. Each collection layer 51 is removable, allowing other fully loaded collection layers 51 to be replaced simultaneously as one layer is being collected.

[0034] Refer to the attached Figure 4 , Attachment Figure 5As shown, the number of collection layers 51 in the collection tank 5 is not limited to four. This embodiment uses four collection layers as an example. Preferably, each collection layer 51 within the collection tank 5 has a water level sensor to prevent seawater from overflowing and accumulating within the collection layer 51. The valves within the collection tank 5 are collectively controlled by the computer control system on the fishing vessel 1. The collection order of the collection layers in the collection tank 5 can be as follows: the fourth collection layer 51d, the third collection layer 51c, the second collection layer 51b, and the first collection layer 51a. When the high-pressure pump 12 initially delivers krill water from the first water filtration device 41 to the collection tank 5, valve No. 4 64 is opened to allow the water to enter the fourth collection layer 51d. The drain valve 65 can be controlled to ensure that the water level in the fourth collection layer 51d does not overflow or accumulate. The sensor information from the echo sounder of the first water filter 41 is synchronously connected to the computer on the fishing boat 1. When the echo sounder detects that all the shrimp in the first water filter 41 have left, valve No. 4 64 is closed, valve No. 3 63 is opened, and the outlet of the high-pressure pump 12 is switched to the auxiliary outlet pipe 34b, transferring the shrimp-water mixture in the second water filter 42 into the third collection layer 51c. The remaining collection layers 51 collect the shrimp-water mixture in the same manner, similarly opening the valves at the entrance of the corresponding collection layer 51. Each collection layer 51 is removable. While one collection layer 51 is collecting the shrimp-water mixture, the remaining collection layers 51 that have completed collection can be removed and replaced with new, empty collection layers 51, ensuring the continuous capture and collection of Antarctic krill and significantly improving the collection efficiency of the collection tank 5.

[0035] It should also be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application. Unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", etc. should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be a communication between the internal parts of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0036] The embodiments and / or implementation methods described above are only used to illustrate the preferred embodiments and / or implementation methods for realizing the technology of the present invention, and do not impose any form of limitation on the implementation methods of the technology of the present invention. Any person skilled in the art may make slight changes or modifications to other equivalent embodiments without departing from the scope of the technical means disclosed in the content of the present invention, but they should still be regarded as technologies or embodiments that are essentially the same as the present invention. This article uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method and core ideas of this application. The above is only the preferred implementation method of this application. It should be pointed out that due to the limitations of textual expression, there are objectively infinite specific structures. For ordinary technicians in this technical field, without departing from the principles of this application, they can also make several improvements, modifications or changes, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the inventive concept and technical solution to other occasions without improvement, should be regarded as the scope of protection of this application.

Claims

1. A device for conveying Antarctic krill net bag fish, comprising a fishing vessel (1), a trolling line (11) arranged at the stern of the fishing vessel (1), a high-pressure pump (12) and a collection box (5) fixed on the deck of the fishing vessel (1), a trawl (13) suspended at the end of the trolling line (11), characterized in that: The tail of the trawl net (13) is connected to a rigid shrimp guide bin (21); a first water filter device (41) is suspended below the sea surface at the tail of the fishing boat (1); a first delivery pipe (32) is connected between the first water filter device (41) and the rigid shrimp guide bin (21); a second delivery pipe (33) is connected between the collection box (5) and the first water filter device (41); a pressure outlet pipe (34) is provided at the inlet of the first water filter device (41) and leads to the high-pressure pump (12); a first high-pressure one-way valve (35a) is provided at the connection between the pressure outlet pipe (34) and the first delivery pipe (32) near the rigid shrimp guide bin (21).

2. The Antarctic krill net bag fishing conveying device according to claim 1, characterized in that: The first water filtering device (41) comprises a cylindrical filter screen (41b) and a drainage chamber (41c) at the bottom; the drainage chamber (41c) is in communication with the cylindrical filter screen (41b); and a submersible pump (43) is provided in the drainage chamber (41c).

3. The Antarctic krill net bag fishing conveying device according to claim 2, characterized in that: The mesh size of the cylindrical filter (41b) is between 3 and 3.5 cm.

4. The Antarctic krill net bag fishing conveying device according to claim 2, characterized in that: A second water filter device (42) is provided next to the first water filter device (41). The first delivery pipe (32) is further provided with a first hose branch (36) leading to the second water filter device (42). The high-pressure pump (12) is further provided with an auxiliary pressure outlet pipe (34b) connected to the first hose branch (36). The high-pressure pump (12) is provided with two pressure outlets, one pressure outlet connected to the pressure outlet pipe (34) and the other pressure outlet connected to the auxiliary pressure outlet pipe (34b). The outlet of the second water filter device (42) is further provided with a second hose branch (37) connected to the second delivery pipe (33). The internal structure of the second water filter device (42) is completely the same as that of the first water filter device (41). A second high-pressure one-way valve (35b) is provided in the first hose branch (36), a third high-pressure one-way valve (35c) is provided in the second delivery pipe (33), and a fourth high-pressure one-way valve (35d) is provided in the second hose branch (37).

5. The Antarctic krill net bag fishing conveying device according to claim 4, characterized in that: The first water filtering device (41) and the second water filtering device (42) are provided with echo detectors.

6. The Antarctic krill net bag fishing conveying device according to claim 1, characterized in that: The collection box (5) comprises a fixing frame (53), the fixing frame (53) being provided with detachable collection layers (51) arranged in an upper and lower manner, the collection layers (51) being connected to each other by drainage pipes (52), and the second delivery pipe (33) being connected to each collection layer (51) by a pipe, wherein a valve is provided in the pipe.

7. The Antarctic krill net bag fishing conveying device according to claim 6, characterized in that: The accommodation volume of the single collection layer (51) is larger than the accommodation volume of the first water filtering device (41).

8. The Antarctic krill net bag fishing conveying device according to claim 6, characterized in that: The collection layer (51) comprises a first collection layer (51a), a second collection layer (51b), a third collection layer (51c), and a fourth collection layer (51d) which are sequentially installed in parallel from top to bottom; A valve No. 1 (61) is provided at the inlet of the first collecting layer (51a); A second valve (62) is provided at the inlet of the second collecting layer (51b); The inlet of the third collecting layer (51c) is provided with a third valve (63); The inlet of the fourth collecting layer (51d) is provided with a fourth valve (64).

9. A method for transporting Antarctic krill net bag fish based on the device of claim 2, characterized in that: Suction: starting the submersible pump (43) at the bottom of the first water filtering device (41) to suck the shrimp and seawater in the trawl net (13); Pushing: After the shrimps are enriched in the first water filter (41), the submersible pump (43) is turned off, and the high-pressure pump (12) is turned on to push the shrimps accumulated in the first water filter (41) to the collection box (5) by delivering pressure through the pressure outlet pipe (34); Cycle: Repeat the suction and push steps until the collection box (5) collects the last collection and then proceeds to the next step; End: Switch off the high pressure pump (12).

10. A method for transporting Antarctic krill net bag fish based on the device of claim 4, characterized in that: Primary suction: starting the submersible pumps (43) in the first water filtering device (41) and the second water filtering device (42) to suck the shrimp and seawater in the trawl net (13); One push: wait until the shrimp are completely enriched in the first water filter device (41) and the second water filter device (42), close the submersible pumps (43) in the first water filter device (41) and the second water filter device (42), open the pressure outlet pipe (34) to connect to the pressure outlet of the high-pressure pump (12), and the high-pressure pump (12) pushes the shrimp in the first water filter device (41) to the collection box (5) through the pressure outlet pipe (34); Primary synchronization: the pressure outlet of the high-pressure pump (12) is switched from the pressure outlet pipe (34) to the auxiliary pressure outlet pipe (34b), and the high-pressure pump (12) pushes the shrimp in the second water filter device (42) to the collection box (5) through the auxiliary pressure outlet pipe (34b), while the submersible pump (43) in the first water filter device (41) is turned on to suck the shrimp and seawater in the trawl net (13); Secondary synchronization: wait until the shrimps are completely enriched in the first water filter device (41), and all the shrimps in the second water filter device (42) are pushed into the collection box (5), then the submersible pump (43) in the first water filter device (41) is turned off, and the high-pressure pump (12) switches from the pressure outlet of the auxiliary pressure outlet pipe (34b) to the pressure outlet of the pressure outlet pipe (34), and the high-pressure pump (12) pushes the shrimps in the first water filter device (41) into the collection box (5) through the pressure outlet pipe (34); Synchronous ending: while the second synchronous execution is being performed, the submersible pump (43) in the second water filtering device (42) is turned on to start pumping the shrimp and seawater in the trawl net (13); Loop: Repeat the steps of first synchronization, second synchronization, and synchronization end until the collection box (5) performs the last collection work and then executes the next step; End: Execute the first synchronization and the second synchronization steps, and turn off the high-pressure pump (12) after the shrimps in the first water filtering device (41) have completely entered the collection box (5).

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