Multistage anti-escape low-resistance mechanized fishing system

Abstract

The application discloses a multi-stage anti-escape low-resistance mechanized fishing system, which comprises a net cage, a main net and a traction device, the main net comprises a main net upper cable, a main net middle cable, a main net lower cable and a main net netting, and the main net further comprises a middle cable traction rope connected with the main net middle cable. The fishing system is provided with corresponding control structures for different escape paths of fish in the full-water mechanized purse seine fishing process, a profiled bottom-pasting anti-drilling escape cable assembly is used for plugging local gaps caused by pool bottom undulation, an induction anti-escape net is used for changing the take-off position and movement path of fish in the last section of the netting, a bottom-picking anti-escape net is used for receiving fish bodies after passing through the main net, an inflation anti-escape unit is used for forming a flexible upper anti-jumping barrier, and a guide mechanism reduces the frictional resistance of the net body when passing through the fish collecting net cage through rolling guidance. Multi-directional anti-escape structures including bottom anti-drilling, middle enclosure, upper anti-jumping, net-passing receiving and entrance anti-escape are formed.

Description

Technical Field

[0001] This invention relates to the field of aquaculture, specifically to a multi-stage escape-prevention, low-resistance mechanized fishing system. Background Technology

[0002] Pond aquaculture is an important production method in my country's freshwater aquaculture. Traditional pond harvesting methods include manual seine netting, draining the pond, and simple mechanical seine netting. Manual seine netting is labor-intensive, requires a large number of workers, and has low efficiency; draining the pond requires discharging a large amount of water, which can easily cause stress, oxygen deficiency, scale loss, and body damage to fish; although simple mechanical seine netting can reduce manual labor, it still has problems such as unstable net posture, bottom line separation, fish jumping and escaping, escaping through gaps, high guiding resistance, and fish damage during full-water harvesting.

[0003] Existing mechanical seine netting devices typically focus on traction power, track movement, winch retrieval, or overall net movement, with limited systematic control over fish escape routes during mechanized purse seine fishing in full water. Especially towards the end of the retrieval phase, fish density increases rapidly, and startled fish are prone to jumping upwards, forwards, or backwards over the net to escape. When the pond bottom is uneven, the thickness of the silt varies, or there is a slope, the lower line can easily detach from the bottom, allowing fish to escape through the bottom. When the main net passes through the entrance of the fish collection cage, it can easily cause wear and tear on the net, increase traction resistance, and create lateral escape channels at the guide gaps.

[0004] Furthermore, for small and medium-sized aquaculture ponds, traditional fishing nets often have their top, middle, and bottom lines arranged almost flush. During the net-hauling process, gaps easily form between the top line and the water surface, allowing fish to escape along the pond's edge. When the traction equipment is positioned on the pond bank, the traction rope and net line are dragged close to the bank's surface. However, the abundance of thick weeds and vines growing on the bank easily entangles and jams the ropes, creating significant resistance that suspends the net upwards, causing deformation and allowing fish and shrimp to escape through the gaps, resulting in poor catch rates. Simultaneously, dragging the bottom line in traditional net-hauling methods tends to create excessive bottom mud and resistance, and dragging the bottom line during the final net-hauling stage easily allows fish to escape from the bottom line. Summary of the Invention

[0005] The present invention aims to overcome the shortcomings of the prior art and provide a multi-level escape-proof, low-resistance mechanized fishing system.

[0006] Technical solution: A fishing system includes a net cage, a main net, and a traction device. The main net includes a main upper section, a main middle section, a main lower section, and a main net cover. The main net also includes a middle section traction rope connected to the main middle section.

[0007] Furthermore, the middle section of the main network lower section uses a first chain, and the two sides use second chains, with the first chain connecting the two second chains; the first chain is thicker than the second chain.

[0008] Furthermore, the middle traction rope is connected to the main net middle traction rope through multiple cable ties.

[0009] Furthermore, the traction device includes two traction machines, which are respectively connected to both ends of the central traction rope.

[0010] Furthermore, the traction machine includes a traction force detection mechanism.

[0011] The traction force detection mechanism is used to detect the traction tension on both sides, sudden changes in traction tension, and changes in traction load. When the difference in traction tension between the left and right sides exceeds a preset threshold such as 200 kg (most tension is below 100 kg), it indicates that the net is caught, and it is necessary to stop the operation. The net shape is manually judged to find and eliminate the fault. The left and right traction speed or traction rhythm is adjusted by the control unit to keep the main net relatively balanced.

[0012] Furthermore, a contoured bottom-fitting anti-drilling and anti-escape bottom-fitting assembly is connected to the main mesh bottom line. The contoured bottom-fitting anti-drilling and escape bottom-fitting assembly includes a bottom-fitting skirt connected to the main mesh bottom line, a flexible counterweight chain connected to the bottom-fitting skirt, and multiple elastic connecting straps connecting the main mesh bottom line and the flexible counterweight chain. Bottom rollers or slippers are installed at the flexible counterweight chain.

[0013] Therefore, the contour-following bottom-adhering anti-drilling bottom line component enables the bottom line to float up and down and remain attached to the bottom when encountering protrusions, pits, or changes in silt thickness on the pool bottom.

[0014] Thus, the flexible counterweight chain provides downward pressure to the bottom line, and the bottom skirt fills the local gaps between the bottom line and the pool bottom. The elastic connecting straps allow the bottom line assembly to deform locally when encountering bumps or depressions in the pool bottom, preventing tearing of the net due to rigid traction. Bottom slippers reduce frictional resistance between the bottom line and the pool bottom.

[0015] Furthermore, the contour-following bottom-drilling anti-escape line assembly also includes pressure sensors or tension indicators.

[0016] Therefore, tension indicators are set locally on the bottom line. When the bottom line gets caught on the bottom, detaches from the bottom, or experiences abnormal stress, the tension indicators will show a visual change or send a signal to the control components.

[0017] Furthermore, the elastic connecting belt includes a first elastic belt connected to the main net lower section, a second elastic belt connected to the counterweight chain, and a tension sensor connecting the first elastic belt and the second elastic belt. The tension sensor is connected to a controller, and the controller is connected to an audible and visual alarm unit.

[0018] Therefore, when the elastic connecting belt is stretched excessively, the net will get stuck and an audible and visual alarm will alert the operator.

[0019] In some embodiments, the controller is connected to a Bluetooth unit.

[0020] In some embodiments, the tension sensor is powered by a battery.

[0021] Therefore, the alarm signal can also be transmitted to the main control device on shore via Bluetooth.

[0022] In some embodiments, the tension indicator is a corrugated sleeve fitted over the elastic connecting band.

[0023] By observing the elongation of the corrugated sleeve, it can be determined whether the elastic connecting strip is under abnormal stress.

[0024] Furthermore, the corrugated pipe is a red corrugated pipe.

[0025] Therefore, red is easier to observe.

[0026] Furthermore, the distance between the lower section of the main network and the upper section of the main network is 4-6 meters, preferably 4.8-5 meters; the distance between the lower section of the main network and the middle section of the main network is 0.7-1 meter, preferably 0.8 meters.

[0027] Furthermore, the length of the main netting is between 20 and 500 meters; preferably 350 to 450 meters.

[0028] Furthermore, multiple inflatable escape prevention units are provided at the main network top.

[0029] The inflatable escape-prevention unit effectively prevents fish from escaping over the main net. It effectively traps a small number of silver carp and mandarin fish that, despite their strong jumping ability, manage to escape the guide net, as they lose their better jumping distance and height. This system also functions to: provide buoyancy to the main net's upper liner, maintaining the net at a predetermined upright height; adjust the buoyancy and elevation of the upper liner through air pressure regulation to adapt to different pond depths, different stages of net retrieval, and varying fish jumping intensities; and provide flexible cushioning during fish jumping and impacts, reducing scale loss, abrasions, and bleeding. Furthermore, due to the presence of multiple inflatable escape-prevention units, if one unit fails, the entire upper liner's buoyancy and anti-jump function are prevented from failing through segmented isolation.

[0030] Furthermore, the inflatable escape prevention unit is provided with one or more of the following: a wear-resistant layer and a buffer layer.

[0031] Furthermore, it also includes an inflation tube and an inflation pump connected to the inflation tube.

[0032] Furthermore, multiple inflatable escape prevention units are connected to the inflation pipe in parallel.

[0033] Furthermore, each inflatable escape prevention unit is connected to the inflation tube via a connecting tube.

[0034] In some embodiments, the inflation tube is connected to an inflatable escape prevention unit at the far end, and multiple inflatable escape prevention units are connected in series.

[0035] Furthermore, the inflatable escape prevention unit is a cuboid, 4-6 meters long, 0.2-0.5 meters high, and 0.1-0.4 meters wide.

[0036] Furthermore, the inflatable escape prevention unit is connected to the main network cable via buckles or cable ties.

[0037] Furthermore, the connecting pipe has a switch valve.

[0038] Before use, the valve can be opened to facilitate the inflation of the inflation tube into the anti-escape unit.

[0039] Furthermore, the inflatable escape prevention unit also has a deflation valve.

[0040] Therefore, an independent vent valve is set up to facilitate the release of air from the inflation-proof unit when needed.

[0041] Furthermore, the inflatable escape prevention unit also has a pressure relief valve.

[0042] Therefore, when the inflatable anti-escape unit is compressed, air can be released through the pressure relief valve.

[0043] Furthermore, the inflatable escape prevention unit is equipped with longitudinal bracing.

[0044] Thus, the longitudinal bracing extends along the length of the inflation unit to limit excessive inflation and maintain an upright shape.

[0045] Furthermore, the inflatable escape prevention unit is provided with a transverse compartment, which divides the interior of the inflatable unit into multiple air chambers, and the air chambers are connected to each other through ventilation holes.

[0046] Therefore, when a chamber ruptures and depressurizes, the structure of the inflation and anti-escape unit makes the leakage slow, and it can still be used for a certain period of time without external pressure.

[0047] Furthermore, multiple inflatable escape prevention units are only partially arranged in the middle of the main net, and the length of the distribution of multiple inflatable escape prevention units is 40-60 meters, preferably 50 meters.

[0048] Furthermore, it also includes an anti-escape net installed inside the main net. The anti-escape net includes an anti-escape net cover, an anti-escape net top, and an anti-escape net traction rope. Multiple connecting ropes connect the anti-escape net top and the main net top. An anti-escape net top float is installed at the anti-escape net top.

[0049] Therefore, the anti-escape net can induce fish to jump in advance, thus causing them to accidentally fall into the front jumper buffer zone and be further surrounded and controlled by the main net. Most fish will find it difficult to jump again and lose their chance to escape.

[0050] Furthermore, the guide rope and the guide net upper rope of the escape prevention net are connected by multiple cable ties.

[0051] Furthermore, the length of the connecting rope is 30-100cm; preferably, the length of the connecting rope is 50-70cm.

[0052] Furthermore, the distance between the main netting and the anti-escape netting is 30-100cm; preferably, it is 50-70cm.

[0053] Furthermore, the guide netting is located in the middle of the main netting, and the length of the guide netting is 40-60 meters, preferably 50 meters.

[0054] Therefore, based on the observations of the previous net pulling, the fish basically did not jump when the net was pulled in the early stages. However, in the final stage when the net was only 50 meters long, when the fish were densely gathered in the net, silver carp, bighead carp, grass carp, and other species began to jump along the net's upper edge, escaping in large numbers. Therefore, it was only necessary to prevent jumping in the last part of the main net. The escape-inducing net was located only in the middle of the main net, about 50-80 meters long and about 80 centimeters wide. When pulling the net in the final stage, it induced the fish to jump in advance, causing them to accidentally fall into the front jumper buffer zone and be further surrounded and controlled by the main net. Most of the fish could not jump again and lost their chance to escape. However, a small number of fish with high jumping ability, such as silver carp and mandarin fish, may still jump. This can be controlled by setting an inflatable escape-inducing unit on the upper part of the main net.

[0055] Furthermore, the height of the anti-escape netting is 60-100cm; preferably, 80cm.

[0056] Furthermore, it also includes a bottom-mounted anti-escape net, which is connected to the main net and located outside the main net. The bottom of the bottom-mounted anti-escape net is connected to the main net, thus forming a pocket structure.

[0057] Therefore, when a small number of fish fall backward over the main net, their bodies enter the pocket structure, making it difficult for them to jump out again.

[0058] Furthermore, the bottom anti-escape net is located in the middle of the main net, and the length of the guiding anti-escape net is 40-60 meters, preferably 50 meters.

[0059] Furthermore, it also includes two guiding mechanisms, which are respectively arranged on both sides of the opening of the cage; the guiding mechanism includes a frame, a bottom roller and two upper rollers, the frame includes a rod, a bottom shaft and two upper shafts, the bottom roller is installed at the bottom shaft, and the two upper rollers are respectively installed at the two upper shafts, both the bottom roller and the upper rollers have bristles, and a net passage is formed between the two upper rollers.

[0060] Furthermore, the mesh passage is 8-15cm wide, preferably 10cm wide.

[0061] Furthermore, the length of the bristles is 3-5cm, preferably 4cm.

[0062] Furthermore, the length of the insertion rod is greater than or equal to 1 meter.

[0063] Thus, the upper and lower rollers convert hard friction into rolling friction, reducing traction resistance and net wear; the flexible bristles elastically bend as the net passes through, not obstructing its passage; when fish attempt to escape through the gaps in the net passage, the flexible bristles form a flexible blockage, thereby reducing lateral escape. The lower end of the insertion rod can be equipped with a mud-insertion tip, a support tray, a limiting plate, or an adjustable depth positioning component to adapt to different silt thicknesses and pond bottom bearing conditions.

[0064] Furthermore, the bottom axis is arranged horizontally; the two upper axes are arranged vertically.

[0065] Furthermore, the frame is a steel frame; the insertion rod is a steel rod; and both the bottom shaft and the top shaft are steel shafts.

[0066] Furthermore, the guide mechanism has a hanging rope.

[0067] This allows the rope to be connected to the net cage, helping to secure it.

[0068] Furthermore, both ends of the main net have triangular wing nets, each triangular wing net comprising wing net panels and a triangular wing net base, the base of which connects the lower main net and the upper main net.

[0069] Furthermore, the main network top is connected to an upper network traction rope.

[0070] Furthermore, the main network topology has a main network topology float.

[0071] Furthermore, the main upper rope and the upper rope traction rope are connected by cable ties.

[0072] Furthermore, the length of the triangular wing net along the length direction of the main net is 1-3 meters, preferably 2 meters.

[0073] Furthermore, the angle between the bottom line of the triangular wing net and the bottom line of the main net is 30-60 degrees, preferably 45 degrees.

[0074] Furthermore, the base of the triangular wing net is an iron chain.

[0075] Furthermore, the base of the triangular wing net is a 3-6mm thick iron chain.

[0076] Therefore, the triangular wing net can solve the following problems: ① During the net-pulling process, the triangular wings can be partially raised above the water surface, filling the escape gap between the top line and the water surface caused by dragging the middle and top lines in traditional net-pulling; ② The increased weight of the bottom line in the triangular wing area can closely adhere to the boundary between the pond embankment and the water body, blocking the escape channel along the pond edge; ③ Effectively solves the problem of fish and shrimp escaping along the edge of the pond embankment during mechanical fishing.

[0077] Furthermore, it also includes two roller sections, each roller section comprising a connecting shaft and a cylinder body, the cylinder body being passed through the connecting shaft and capable of rotating relative to the connecting shaft; the roller section is capable of floating on the water surface; the central traction rope is connected to one end of the connecting shaft; the traction device includes two traction trailers, the two traction trailers and the two roller sections corresponding one-to-one, and the connecting shafts of the traction trailers and the corresponding roller sections are connected by traction ropes.

[0078] Furthermore, the upper traction rope is connected to one end of the connecting shaft.

[0079] Therefore, both the middle traction rope and the upper traction rope are connected to one end of the connecting shaft. The middle traction rope mainly bears the traction force, while the upper traction rope remains relatively loose.

[0080] Furthermore, the towing trailer has a traction force detection mechanism for detecting traction force.

[0081] The traction force detection mechanism is used to detect the traction tension on both sides, sudden changes in traction tension, and changes in traction load. When the difference in traction tension between the left and right sides exceeds a preset threshold such as 200 kg (most tension is below 100 kg), it indicates that the net is caught, and it is necessary to stop the operation. The net shape is manually judged to find and eliminate the fault. The left and right traction speed or traction rhythm is adjusted by the control unit to keep the main net relatively balanced.

[0082] In some embodiments, the traction force detection mechanism is located at the traction rope.

[0083] Furthermore, the cylinder is capable of floating on the water surface.

[0084] Furthermore, the cylindrical body has an inner cavity.

[0085] In some embodiments, the cylinder is a stainless steel cylinder.

[0086] Therefore, if accidentally fallen into the water, it can float due to its own buoyancy. Function: This solves the problem of mechanical net-pulling equipment being placed on the pond bank, where the traction rope and net line are dragged close to the surface of the bank. The pond bank is often overgrown with thick weeds that entangle and jam the ropes; the significant resistance suspends the net upwards, causing deformation and allowing fish and shrimp to escape through gaps, resulting in poor catch efficiency. By using a floating roller section on the bank to raise the traction rope and net line, the problem of the ropes directly touching the pond bank surface is avoided, preventing weeds from entangled and jamming the ropes, effectively reducing drag resistance.

[0087] Furthermore, openings are provided at both ends of the connecting shaft.

[0088] Therefore, the opening is used to connect the traction rope.

[0089] Furthermore, a bearing is connected between the connecting shaft and the cylinder.

[0090] In some embodiments, the inner side of the cylinder has an annular groove, and a pulley that mates with the annular groove is installed at the connecting shaft.

[0091] Beneficial effects: Compared with the prior art, the present invention has the following advantages: 1. This invention combines an anti-jump net, a bottom anti-escape net, and an upper inflatable anti-escape unit into a three-dimensional anti-jump and anti-escape structure, which can respectively intercept fish escape in a closed loop.

[0092] 2. During the netting process, the triangular wing nets on both sides are partially raised above the water surface to fill the escape gap between the upper line and the water surface. At the same time, the counterweight bottom line is closely attached to the boundary between the pond embankment and the water body to block the escape channel on the pond side.

[0093] 3. The contour-following bottom-adhering anti-escape bottom line component, through the synergistic effect of the flexible counterweight chain, bottom skirt, and elastic connecting belt, adapts to the unevenness of the pond bottom and changes in silt thickness, preventing fish from escaping from the bottom.

[0094] 4. The method of using an externally mounted middle traction rope to pull the middle traction rope can effectively reduce the excessive resistance caused by dragging the bottom mud compared to the traditional bottom traction rope.

[0095] 5. The upper and lower rollers have bristles. When the net passes through the net passage, the sliding friction is converted into rolling friction by the vertical upper and lower rollers, which effectively reduces traction resistance and net wear. The flexible bristles bend elastically when the net passes through, without obstructing the passage of the net. In addition, the bristles at the upper and lower rollers block the gaps in the net passage, reducing the chance of fish escaping to the side.

[0096] 6. The roller section on the bank suspends and raises the traction rope and net line, preventing the rope from dragging directly against the pond embankment, avoiding the problem of weeds getting tangled and the rope getting stuck, and effectively reducing dragging resistance.

[0097] 7. This invention can complete the enclosure, netting, guiding, fish collection, and temporary holding of fish in a pond that is full of water without draining the water, avoiding water disturbance, fish stress, and oxygen deficiency caused by draining the water for fishing. The segmented inflatable buoyancy anti-jump buffer device provides flexible cushioning when fish jump and collide, reducing scale loss, abrasions, and bleeding on the body surface, unlike rigid anti-jump nets.

[0098] 8. The segmented inflatable escape-prevention device consists of multiple inflation units. By adjusting the air pressure, the buoyancy of the upper frame and the height above the water can be changed to adapt to different pond depths, different stages of net retrieval, and different jumping intensities of fish.

[0099] 9. The adaptive net posture control component for traction tension can intelligently determine whether the net is tilting, snagging on the bottom, encountering obstacles, or entering the high-density fish-gathering state at the end of the net-hauling process by detecting the difference in traction tension between the left and right sides and changes in traction load. When the difference in traction tension between the left and right sides exceeds a preset threshold, the control unit adjusts the left and right traction speeds to keep the main net balanced. This improves the stability and standardization of the full-water mechanized fishing process and reduces reliance on human experience.

[0100] 10. This invention sets up corresponding control structures for different escape paths that fish may take during mechanized net purse seine fishing in full water, and forms a complete spatial escape prevention system through the synergistic effect of these structures. Specifically, the contour-following bottom-drilling anti-escape assembly is used to seal the local gaps between the bottom of the main net and the pond bottom caused by the undulations of the pond bottom; the induced escape-prevention net is used to change the jumping position and movement path of fish at the end of the net hauling process; the bottom-catching escape-prevention net is used to catch fish that have crossed the main net; the inflatable escape-prevention unit is used to form a flexible upper anti-jump barrier; and the guiding mechanism reduces the frictional resistance of the net as it passes through the fish collection box through rolling guidance, and seals the lateral gaps in the guiding channel with flexible bristles. This forms a multi-directional escape prevention structure including bottom anti-drilling, middle enclosure control, upper anti-jump, net-crossing catch, and entrance escape prevention, while simultaneously reducing the resistance between the net and the pond bottom and the guiding mechanism during mechanical traction. Attached Figure Description

[0101] Figure 1 This is a schematic diagram showing the start of fishing in Example 1; Figure 2 This is a magnified view of region A; Figure 3 This is a schematic diagram of the fishing net haul-in for Example 1; Figure 4 This is a magnified view of region B. Figure 5 A schematic diagram showing the connection of the main net, the guide net, the bottom net, and the contour-following bottom anti-drilling and escape-prevention bottom line components; Figure 6 This is a magnified view of region C; Figure 7 This is a magnified view of region D; Figure 8 Schematic diagram of the guiding mechanism; Figure 9 This is a schematic diagram of the fishing process in Example 2; Figure 10 This is a schematic diagram of how the traction rope passes through the net passage in Example 2; Figure 11 This is a schematic diagram of the connection between the triangular wing net and the main net in Example 2; Figure 12 This is a schematic diagram of the pond cross-section during fishing using the fishing system in Example 2.

[0102] Figure label: 1. Fish cage; 2. Main net; 2.1 Main net top layer; 2.2 Main net middle layer; 2.3 Main net bottom layer; 2.4 Middle layer traction rope; 2.5 Main net cover; 2.6 Inflatable escape prevention unit; 2.7 Top layer traction rope; 3. Escape-prevention net; 3.1 Netting for escape prevention; 3.2 Netting cover for escape prevention; 3.3 Traction rope for escape prevention; 4. A safety net to prevent escape; 5. Connect the pull rope; 6. Contour-following bottom anti-drilling and escape bottom line assembly; 6.1 Bottom skirt; 6.2 Flexible counterweight chain; 6.3 Elastic connecting belt; 6.4 Slipper; 7. Guide mechanism; 7.1 Frame; 7.2 Bottom shaft; 7.3 Top shaft; 7.4 Bottom roller; 7.5 Top roller; 7.6 Insert rod; 8. Roller section; 8.1 Connecting shaft; 8.2 Cylinder body; 9. Triangular wing net; 9.1 Wing net mesh; 9.2 Triangular wing net base line; 10 ponds; 11 tractor-trailers; 12. Traction ropes. Detailed Implementation

[0103] The present invention will be further illustrated below with reference to specific embodiments. These embodiments are implemented based on the technical solutions of the present invention, and it should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention.

[0104] Example 1 like Figure 1-8As shown, a multi-stage escape-prevention, low-resistance mechanized fishing system includes a net cage 1, a main net, and a traction device. The main net includes a main upper line 2.1, a main net middle line 2.2, a main net lower line 2.3, and a main net cover 2.5. The main net also includes a middle line traction rope 2.4, which is connected to the main net middle line 2.2. The middle section of the main net lower line 2.3 uses a first chain, and the two sides use second chains; the first chain is thicker than the second chain. The middle line traction rope 2.4 is connected to the main net middle line 2.2 by multiple cable ties. The traction device includes two traction machines, which are respectively connected to both ends of the middle line traction rope 2.4. A contoured bottom-fitting anti-drilling and anti-escape bottom-fitting assembly 6 is connected to the main mesh lower line 2.3. The contoured bottom-fitting anti-drilling and escape bottom-fitting assembly 6 includes a bottom-fitting skirt 6.1 connected to the main mesh lower line 2.3, a flexible counterweight chain 6.2 connected to the bottom-fitting skirt 6.1, and multiple elastic connecting straps 6.3 connecting the main mesh lower line 2.3 and the flexible counterweight chain. A bottom roller or slipper 6.4 is installed at the flexible counterweight chain 6.2.

[0105] The main net 2.5 is 400 meters long; the distance from the lower main net 2.3 to the upper main net 2.1 is 4-6 meters, preferably 4.8-5 meters; the distance from the lower main net 2.3 to the middle main net 2.2 is 0.7-1 meters, preferably 0.8 meters. Multiple inflatable escape-prevention units 2.6 are installed at the upper main net 2.1. The fishing system also includes an inflation pipe and an inflation pump connected to the inflation pipe; multiple inflatable escape-prevention units 2.6 are connected to the inflation pipe in parallel. Each inflatable escape-prevention unit 2.6 is rectangular, 4-6 meters long, 0.2-0.5 meters high, and 0.1-0.4 meters wide. The inflatable escape-prevention unit 2.6 is connected to the upper main net 2.1 by buckles or cable ties. Each inflatable escape-prevention unit 2.6 is connected to the inflation pipe via a connecting pipe. The connecting pipe has a pressure relief valve. The inflatable escape-prevention unit 2.6 has longitudinal bracing inside. The inflatable escape prevention unit 2.6 has a transverse compartment inside, which divides the interior of the inflatable unit into multiple air chambers, which are connected by ventilation holes. Multiple inflatable escape prevention units 2.6 are only partially arranged in the middle of the main net, and the length of the distribution of multiple inflatable escape prevention units 2.6 is 40-60 meters, preferably 50 meters.

[0106] The fishing system also includes an escape-prevention net 3 located inside the main net. The escape-prevention net 3 comprises an escape-prevention net cover 3.2, an escape-prevention net top 3.1, and an escape-prevention net towing rope 3.3. Multiple connecting ropes 5 connect the escape-prevention net top 3.1 and the main net top 2.1. An escape-prevention net float is installed at the escape-prevention net top 3.1. The escape-prevention net towing rope 3.3 and the escape-prevention net top 3.1 are connected by multiple cable ties. The length of the connecting rope 5 is 30-100cm; preferably, the length is 50-70cm. The distance between the main net top 2.1 and the escape-prevention net top 3.1 is 30-100cm; preferably, it is 50-70cm. The escape-prevention net cover 3.1 is located in the middle of the main net cover 2.5, and the length of the escape-prevention net cover 3.2 is 40-60 meters, preferably 50 meters. The height of the anti-escape netting 3.2 is 60-100cm; preferably, 80cm.

[0107] The fishing system also includes a bottom-covering escape-prevention net 4, which is connected to the main net and located on the outside of the main net. The bottom of the bottom-covering escape-prevention net 4 is connected to the main net, thus forming a bag-like structure. The bottom-covering escape-prevention net 4 is located in the middle of the main net mesh 2.5, and the length of the guide escape-prevention net mesh 3.2 is 40-60 meters, preferably 50 meters.

[0108] The fishing system also includes two guiding mechanisms 7, which are respectively located on both sides of the opening of the net cage 1. Each guiding mechanism 7 includes a frame 7.1, a bottom roller 7.4, and two upper rollers 7.5. The frame 7.1 includes a rod 7.6, a bottom shaft 7.2, and two upper shafts 7.3. The bottom roller 7.4 is installed at the bottom shaft 7.2, and the two upper rollers 7.5 are respectively installed at the two upper shafts 7.3. Both the bottom roller 7.4 and the upper rollers 7.5 have bristles, and a net passage is formed between the two upper rollers 7.5. The bottom shaft 7.2 is horizontally arranged; the two upper shafts 7.3 are vertically arranged. The frame 7.1 is a steel frame; the rod 7.6 is a steel rod; and the bottom shaft 7.2 and the upper shafts 7.3 are both steel shafts.

[0109] In this embodiment, the specific usage process of the fishing system is as follows: I. Netting and Setting Up Net Cages: Set up a complete circle of netting (including the main net and other components) around the perimeter of the pond. Place fish-collecting net cages, approximately 20×4×2.5m in size, near the bank. Install a guide mechanism at each of the two corners of the net cage closest to the inside of the pond. The top edge of the net cage is secured to the hanging rope of the guide mechanism with ropes, extending 30cm above the water surface. The net cage can also be secured using steel rods or other components.

[0110] 2. Threading the ropes: After the main net is set up, thread the middle guide rope and the guide net guide rope through the net passage of the guide mechanism (in this case, the guide net guide rope and the middle guide rope are about the same length). In some cases, the guide net guide rope is shorter (the length of the guide net guide rope is slightly longer than the guide net top), and the guide net guide rope can be threaded through the net passage of the guide mechanism at the end of the net closing process.

[0111] 3. Fish Driving with a Seine Net: Two fixed traction machines on the shore pull the middle line to move the entire fishing net towards the fish collection cage while the pond is full of water, continuously gathering the fish. Dragging the middle line can prevent the problems of excessive mud and resistance caused by traditional seine nets, and can also prevent fish from escaping from the bottom line when the net is finally pulled up.

[0112] IV. Final Escape Prevention: In the final netting stage (when the main net is about 50m long and fish begin to escape en masse), the guide rope of the escape prevention net is slightly pulled simultaneously with the outer guide rope of the middle line (if the guide rope is short, manually thread it through the net passage first). This pulls the guide net upwards, causing the net to move forward and inducing fish to jump early, falling into the buffer zone between the guide net and the main net, thus preventing them from jumping out of the main net again. Simultaneously, multiple inflatable escape prevention units form a flexible, solid anti-jump barrier above the water surface, preventing fish with strong jumping abilities from escaping. Furthermore, the bottom of the escape prevention net outside the main net is closed, forming a pocket structure. A directional opening is provided between the bottom escape prevention net and the main net. When a small number of fish fall backwards after crossing the main net, their bodies enter the pocket structure, making it difficult for them to jump out again.

[0113] V. Fish Entry into the Fish Collection Box: Under the pulling force of the traction machine, the main net, the guide net, the bottom escape net, and the inflatable escape-prevention unit can pass through the net passage of the guide mechanism (the inflatable escape-prevention unit can be deflated before passing through the net passage, or it can be evacuated by the air pump, and the inflatable escape-prevention unit can also be compressed and deflated through the pressure relief valve when passing through the net passage), thus driving the fish into the fish collection box through the opening of the net box. When the main net, the guide net, the bottom escape net, and the inflatable escape-prevention unit pass through the net passage, the roller part converts hard friction into rolling friction, reducing traction resistance and net wear; the flexible bristles bend elastically when the net passes through, without obstructing the passage of the net; when fish attempt to escape through gaps, the flexible bristles form a flexible blockage.

[0114] 6. Closing the net cage: After all the fish have entered the net cage by continuously tightening the main net, close the opening of the net cage to seal the fish inside.

[0115] Example 2 like Figure 9-12As shown, a multi-stage escape-prevention, low-resistance mechanized fishing system includes a net cage 1, a main net 2, and a traction device. The main net 2 includes a main upper section 2.1, a main middle section 2.2, a main lower section 2.3, and a main net cover 2.5. The main net 2 also includes a middle section traction rope 2.4, which is connected to the main middle section 2.2. The middle section traction rope 2.4 is connected to the main middle section 2.2 by multiple cable ties. A contoured bottom-feeding escape-prevention bottom line assembly 6 is connected to the main lower section 2.3. The contoured bottom-feeding escape-prevention bottom line assembly 6 includes a bottom-feeding skirt 6.1 connected to the main lower section 2.3, a flexible counterweight chain 6.2 connected to the bottom skirt 6.1, and multiple elastic connecting straps 6.3 connecting the main lower section 2.3 and the flexible counterweight chain 6.2. A bottom roller or slipper 6.4 is installed at the flexible counterweight chain 6.2.

[0116] The distance between the lower main net 2.3 and the upper main net 2.1 is 4-6 meters, preferably 4.8-5 meters; the distance between the lower main net 2.3 and the middle main net 2.2 is 0.7-1 meter, preferably 0.8 meters. The length of the main net 2.5 is between 10-50 meters.

[0117] Multiple inflatable escape-prevention units 2.6 are installed at the main net slab 2.1. The fishing system also includes an inflation pipe and an inflation pump connected to the inflation pipe; the multiple inflatable escape-prevention units 2.6 are connected to the inflation pipe in parallel. Each inflatable escape-prevention unit 2.6 is cuboid, 4-6 meters long, 0.2-0.5 meters high, and 0.1-0.4 meters wide. The inflatable escape-prevention unit 2.6 is connected to the main net slab 2.1 by buckles or cable ties. Each inflatable escape-prevention unit 2.6 is connected to the inflation pipe through a connecting pipe. The connecting pipe has a switch valve. The inflatable escape-prevention unit 2.6 also has a pressure relief valve. The inflatable escape-prevention unit 2.6 has longitudinal bracing inside. The inflatable escape-prevention unit 2.6 has transverse compartments inside, which divide the interior of the inflatable unit into multiple air chambers, which are connected by ventilation holes. Multiple inflatable escape prevention units 2.6 are arranged along the entire length of the main net (in some embodiments, multiple inflatable escape prevention units are only set in the middle section of the main net).

[0118] The fishing system also includes an escape-prevention net 3 located inside the main net 2. The escape-prevention net 3 comprises an escape-prevention net cover 3.2, an escape-prevention net top 3.1, and an escape-prevention net towing rope 3.3. Multiple connecting ropes 5 connect the escape-prevention net top 3.1 and the main net top 2.1. An escape-prevention net float is installed at the escape-prevention net top 3.1. The escape-prevention net towing rope 3.3 and the escape-prevention net top 3.1 are connected by multiple cable ties. The length of the connecting rope 5 is 30-100cm; preferably, the length is 50-70cm. The distance between the main net top 2.1 and the escape-prevention net top 3.1 is 30-100cm; preferably, it is 50-70cm. The length difference between the escape-prevention net cover 3.2 and the main net cover 2.5 is less than 10 meters, preferably less than 5 meters (in some embodiments, the escape-prevention net is only installed in the middle section of the main net cover). The height of the anti-escape netting 3.2 is 60-100cm; preferably, 80cm.

[0119] The fishing system also includes a bottom-covering escape-prevention net 4, which is connected to the main net 2 and located outside the main net. The bottom of the bottom-covering escape-prevention net 4 is connected to the main net 2, thus forming a bag-like structure. The length difference between the bottom-covering escape-prevention net 4 and the main net 2.5 is less than 10 meters, preferably less than 5 meters (in some embodiments, the bottom-covering escape-prevention net is only set in the middle section of the main net 2.5).

[0120] The fishing system also includes two guiding mechanisms 7, which are respectively located on both sides of the opening of the net cage 1. Each guiding mechanism 7 includes a frame 7.1, a bottom roller 7.4, and two upper rollers 7.5. The frame 7.1 includes a rod 7.6, a bottom shaft 7.2, and two upper shafts 7.3. The bottom roller 7.4 is installed at the bottom shaft 7.2, and the two upper rollers 7.5 are respectively installed at the two upper shafts 7.3. Both the bottom roller 7.4 and the upper rollers 7.5 have bristles, and a net passage is formed between the two upper rollers 7.5. The bottom shaft 7.2 is horizontally arranged; the two upper shafts 7.3 are vertically arranged. The frame 7.1 is a steel frame; the rod 7.6 is a steel rod; and both the bottom shaft 7.2 and the upper shafts 7.3 are steel shafts. A hanging rope is provided at each guiding mechanism 7. This hanging rope can be connected to the net cage 1 to help secure it.

[0121] Both ends of the main net 2 have triangular wing nets 9, each including wing net panels 9.1 and a triangular wing net base 9.2. The triangular wing net base 9.2 connects the main net lower strait 2.3 and the main net upper strait 2.1. The main net upper strait 2.1 is connected to an upper strait traction rope 2.7, and a main net upper strait float is located at the main net upper strait 2.1. The main net upper strait 2.1 and the upper strait traction rope 2.7 are connected by cable ties. The length of the triangular wing net 9 along the length direction of the main net 2 is 1-3 meters, preferably 2 meters. The angle between the triangular wing net base 9.2 and the main net lower strait is 30-60 degrees, preferably 45 degrees. The triangular wing net base 9.2 is an iron chain, with a thickness of 3-6 mm.

[0122] The fishing system also includes two drum sections 8, each comprising a connecting shaft 8.1 and a cylinder 8.2. The cylinder 8.2 is passed through the connecting shaft 8.1 and can rotate relative to it. The drum section 8 is capable of floating on the water surface. The middle traction rope 2.4 and the upper traction rope 2.7 are both connected to one end of the connecting shaft 8.1. The traction device includes two traction trailers 11, each corresponding to one of the two drum sections 8. The traction trailers 11 and their corresponding connecting shafts 8.1 are connected via traction ropes 12. Thus, the middle traction rope 2.4 and the upper traction rope 2.7 are both connected to one end of the connecting shaft 8.1. The middle traction rope 2.4 primarily bears the traction force, while the upper traction rope 2.7 remains relatively loose. The cylinder 8.2 has an inner cavity and is capable of floating on the water surface. Openings are provided at both ends of the connecting shaft 8.1 for connecting the traction ropes 12. The inner side of the cylinder 8.2 has an annular groove, and a pulley that mates with the annular groove is installed at the connecting shaft 8.1.

[0123] The fishing system in Example 2 is suitable for small to medium-sized aquaculture ponds of less than 15 mu (approximately 1 hectare), where the pond banks are overgrown with weeds and vines, and the banks are uneven, making it easy for the towing ropes to become entangled and stuck. The specific operation process is as follows: I. Pre-operation preparation: Prepare the fishing system for this application, which includes a main net, a guide net to prevent escape, a bottom net to prevent escape, a triangular wing net, and an inflatable anti-jump unit. Place a horizontal net cage at the other end of the pond, inserting a guide mechanism into each of the two corners of the net cage closest to the inside of the pond.

[0124] Tie the middle traction rope and the upper tension rope together to the hole in the connecting shaft of the drum section. The middle tension rope should be tightened to bear the traction force, while the upper tension rope should be kept loose. Adjust the position of the triangular wing net so that it fits snugly against the pond embankment slope. Place a shore-based towing trailer on each bank of the pond, connecting the trailers to the connecting shaft of the drum section via towing ropes.

[0125] II. Netting from One End of the Pond to the Other: Start two towing trailers on the shore, pulling the corresponding towing ropes on both sides of the pond with a pulling force of no less than 80 kg. The towing ropes pull the rollers, causing them to roll forward on the pond bank. The middle and upper towing ropes are raised off the ground to avoid being entangled by weeds and vines. The rollers then drag the middle towing rope, which in turn pulls the middle towing rope of the main net, moving the entire main net through the full pond. The moving speed should be controlled within 0.3 m / s. The main net is dragged from end E1 to end E2, driving the fish in the pond towards end E2.

[0126] During the netting process, the triangular wing nets on both sides are partially raised above the water surface to fill the escape gap between the upper line and the water surface; the bottom line of the triangular wing net is close to the boundary between the pond embankment and the water body to block the escape channel along the edge of the pond and prevent fish and shrimp from escaping along the edge of the pond embankment.

[0127] Furthermore, during this process, the escape-prevention net can induce fish to jump out early, landing them in the buffer zone between the escape-prevention net and the main net, thus preventing them from jumping out of the main net again. Simultaneously, multiple inflatable escape-prevention units form a flexible, solid anti-jump barrier above the water surface, preventing fish with strong jumping abilities from escaping. Additionally, the bottom of the escape-prevention net outside the main net is closed, forming a pocket structure. A directional opening is provided between the bottom escape-prevention net and the main net. When a small number of fish jump over the main net and fall backward, their bodies enter the pocket structure, making it difficult for them to jump out again.

[0128] 3. Lateral closing on the bank: After the main net reaches the E2 end, the tractors on both sides of the bank will first pull the middle rope to the E3 and E4 positions respectively, and then gradually close it along the embankment towards the E5 and E6 ends.

[0129] 4. Dismantle the roller section and re-thread the ropes: Remove the connecting shaft of the roller section from the traction rope and take the roller section ashore. Tie the traction rope together with the middle and upper ropes. Manually thread the traction ropes on both sides through the middle of the net passage of the guide mechanism at the two corners of the transverse net cage, and then reconnect them to the two towing trailers on the shore.

[0130] 5. Driving the fish into the cage: Start the shore-based towing trailer to continue pulling the main net and drive all the fish in the net into the fish collection cage.

[0131] VI. Closing the net cages and completing the harvest: After all the fish have been driven into the horizontal net cages, the entrances to the net cages are closed, and the fish are sealed inside the net cages, thus completing the harvesting operation.

[0132] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A multi-stage escape-prevention, low-resistance mechanized fishing system, characterized in that, The system includes a net cage, a main net, and a traction device. The main net includes a main top strait, a main middle strait, a main bottom strait, and a main net cover. The main net also includes a middle strait traction rope, which is connected to the main middle strait.

2. The multi-stage escape-prevention, low-resistance mechanized fishing system according to claim 1, characterized in that, The main mesh lower section is connected to a contoured bottom-fitting anti-drilling and anti-escape mesh assembly. The contoured bottom-fitting anti-drilling and escape mesh assembly includes a bottom-fitting skirt connected to the main mesh lower section, a flexible counterweight chain connected to the bottom-fitting skirt, and multiple elastic connecting straps connecting the main mesh lower section and the flexible counterweight chain. Bottom rollers or slippers are installed at the flexible counterweight chain.

3. The multi-stage escape-prevention, low-resistance mechanized fishing system according to claim 1, characterized in that, The distance between the lower section of the main network and the upper section of the main network is 4-6 meters, preferably 4.8-5 meters; the distance between the lower section of the main network and the middle section of the main network is 0.7-1 meter, preferably 0.8 meters.

4. The multi-stage escape-prevention, low-resistance mechanized fishing system according to claim 1, characterized in that, Multiple inflatable escape prevention units are installed at the main network top.

5. The multi-stage escape-prevention, low-resistance mechanized fishing system according to claim 4, characterized in that, It also includes an inflation tube and an inflation pump connected to the inflation tube; the inflation anti-escape unit is a cuboid, 4-6 meters long, 0.2-0.5 meters high, and 0.1-0.4 meters wide; multiple inflation anti-escape units are connected to the inflation tube in parallel; or, the inflation tube is connected to the inflation anti-escape unit at the very end, and multiple inflation anti-escape units are connected in series.

6. The multi-stage escape-prevention, low-resistance mechanized fishing system according to claim 1, characterized in that, It also includes an anti-escape net set inside the main net. The anti-escape net includes an anti-escape net cover, an anti-escape net top, and an anti-escape net traction rope. Multiple connecting ropes connect the anti-escape net top and the main net top. A float is set at the anti-escape net top.

7. The multi-stage escape-prevention, low-resistance mechanized fishing system according to claim 1, characterized in that, It also includes a bottom-mounted anti-escape net, which is connected to the main net and located outside the main net. The bottom of the bottom-mounted anti-escape net is connected to the main net, thus forming a pocket structure.

8. The multi-stage escape-prevention, low-resistance mechanized fishing system according to claim 1, characterized in that, It also includes two guiding mechanisms, which are respectively set on both sides of the opening of the cage; the guiding mechanism includes a frame, a bottom roller and two upper rollers, the frame includes a rod, a bottom shaft and two upper shafts, the bottom roller is installed at the bottom shaft, and the two upper rollers are respectively installed at the two upper shafts. Both the bottom roller and the upper rollers have bristles, and a net passage is formed between the two upper rollers.

9. The multi-stage escape-prevention, low-resistance mechanized fishing system according to claim 1, characterized in that, Both ends of the main net have triangular wing nets, each triangular wing net consisting of wing net panels and a triangular wing net base, the base of which connects the lower main net and the upper main net.

10. The multi-stage escape-prevention, low-resistance mechanized fishing system according to claim 9, characterized in that, It also includes two roller sections, each roller section comprising a connecting shaft and a cylinder body, the cylinder body being passed through the connecting shaft and capable of rotating relative to the connecting shaft; the roller section is capable of floating on the water surface; the central traction rope is connected to one end of the connecting shaft; the traction device includes two traction trailers, the two traction trailers and the two roller sections corresponding one-to-one, and the connecting shafts of the traction trailers and the corresponding roller sections are connected by traction ropes.

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