River crab catching device

Abstract

The utility model belongs to the aquaculture technical field, concretely relates to a river crab fishing device. Including net cage subassembly, net cage subassembly includes the box of one side opening, the box opening end fixedly connected with the anti -climbing eave, the anti -climbing eave upper portion fixedly connected with a plurality of connecting frames, and the front end of the connecting frame is detachably connected with the ground cage. The aerator is fixedly connected on the box, the bottom of the gas pipe of the aerator is fixedly connected on the bottom surface far from the opening end of the box, the gas pipe is fixedly connected with the aeration pipe and is communicated, the aeration pipe is fixedly connected on the bottom surface outer wall surface of the box, the top of the gas pipe extends out of the opening end of the box, and the pump is fixedly connected at the top of the gas pipe. When the high-density river crab is bred, the violent cage phenomenon can be avoided when the ground cage is used to fish, and the crab damage is reduced; the river crabs in the multiple ground cages are concentrated in one net cage, and the efficiency of fishing the river crabs is improved.

Description

Technical Field

[0001] This utility model belongs to the field of aquaculture technology, specifically relating to a crab catching device. Background Technology

[0002] River crabs are delicious and rich in nutrients, making them an important source of high-quality animal protein for humans. They typically burrow in lakes and rivers and are omnivorous. In my country, the main river crab farming areas are along the eastern coast and in rivers, lakes, and ponds connected to the sea. Over the past thirty years, the river crab farming industry has achieved advantages such as rapid growth, short growth cycle, and high economic benefits, becoming a unique industry in my country. Currently, pond crab harvesting devices are mostly bottom traps, which are widely used.

[0003] Chinese utility model patent application number CN202422798576.9 discloses an automatic crab-catching device, including a collection net cage, a pole, and a door panel. A trapping component for catching crabs is located directly above the collection net cage. The top of the collection net cage is above the water surface. A pole is fixedly connected to the lower part of the collection net cage and inserted into the riverbed. A door panel, sloping downwards from front to back, is located on the upper part of the side of the collection net cage facing the river surface. The rear end of the door panel is submerged below the water surface. A flap component is provided at the top opening of the collection net cage to allow crabs of the specified weight to fall into the collection net cage after climbing on it. This utility model provides an automatic crab-catching device.

[0004] However, in current technology, farmers often use high-density farming in ponds to increase economic benefits. During the harvest season, they use traps to catch crabs. Because of the high density, traps often overflow during harvesting. In the crowded space, crabs are prone to oxygen deficiency and cannibalism, leading to death, mutilation, and decreased vitality, resulting in losses. Moreover, catching crabs often requires waiting for them to enter the traps before individually scooping them out, resulting in low harvesting efficiency. Utility Model Content

[0005] To address the shortcomings of existing technologies, this invention provides a crab harvesting device. This invention, through the coordinated use of a net cage assembly, an aerator, and multiple traps, avoids the trap-overrunning phenomenon that occurs when using traps in high-density crab farming, thus reducing crab losses. In this invention, the crabs to be captured crawl along the traps and fall into the cage of the net cage assembly. The cage has a larger space, and a small aerator installed at the bottom of the cage aerates the water inside, preventing oxygen deprivation and cannibalism in the crowded space, reducing crab mortality, amputation, and decreased vitality, and minimizing farming losses. Furthermore, this invention allows the outlets of multiple traps to be converged into a single net cage assembly for harvesting crabs. When a large number of crabs have accumulated in the cage, the entire cage can be removed from the pond to retrieve the crabs, significantly improving harvesting efficiency.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A crab-catching device, characterized in that it includes a net cage assembly, the net cage assembly comprising a cage body with one open side, an anti-climb lintel fixedly connected to the open end of the cage body, and multiple connecting frames fixedly connected to the upper part of the anti-climb lintel, the connecting frames being detachably connected to the front end of the crab trap. An aerator is fixedly connected to the cage body, the bottom of the aerator's air pipe is fixedly connected to the bottom surface of the cage body away from the open end, the air pipe is fixedly connected and communicates with an aeration pipe, the aeration pipe is fixedly connected to the outer wall surface of the bottom surface of the cage body, the top of the air pipe extends out of the open end of the cage body, and a pump is fixedly connected to the top of the air pipe.

[0007] Furthermore, the connecting frame includes a fixed base, one end of which is fixedly connected to the outer wall of the anti-climb lintel, and the other end of which is fixedly connected to a sleeve, the opening of which faces the middle of the box.

[0008] Furthermore, the front end of the ground cage is provided with a conical cage, the pointed end of which is fixedly connected and communicated with the square cage, and the square cage is detachably fitted into the connecting sleeve.

[0009] Furthermore, the trap includes multiple cages connected end to end, each cage having a crab-catching opening on its side wall, and the cage closest to the box being fixedly connected and communicated with the end of the cone-shaped cage away from the square cage.

[0010] Furthermore, the length of the square cage is greater than the length of the sleeve.

[0011] Furthermore, the cage assembly includes a suspension body that surrounds the middle of the outer wall of the cage and is fixedly connected to the outer wall of the cage.

[0012] Furthermore, there are two aeration pipes, which are parallel to the two diagonals of the bottom surface of the box, and multiple air holes are evenly opened on the pipe wall.

[0013] Furthermore, the box is a cube with one open side, consisting of five mesh surfaces.

[0014] Furthermore, the anti-climb lintel is a tetrahedron that fits into the four sides of the box opening, and the upper inner wall of the anti-climb lintel has a smooth slope that slopes inward toward the box.

[0015] Furthermore, there are four connecting frames, each of which is fixedly connected to one side of the corresponding anti-climb lintel.

[0016] Compared with the prior art, the present invention has the following beneficial effects: (1) This utility model can avoid the phenomenon of cage bursting when using traps to catch crabs in high-density farming, thus reducing the farming losses of farmers. The upper part of the net cage assembly is fixedly connected to a connecting frame, and the opening end of the trap can be fitted onto the connecting frame. The opening end of the trap, i.e., the square cage, faces the inside of the box. Crabs crawling in the trap will fall into the box from the opening of the square cage. A ring of suspension bodies is fixedly connected to the outer wall of the box. The suspension bodies have buoyancy in the pond, so the upper part of the box can be suspended above the pond water surface. Moreover, the box is a cube composed of five net surfaces, so the lower part of the inner cavity of the box contains water, and crabs can fall into the water inside the box. The crabs are collected centrally within the enclosure, which has a much larger volume than the fish trap, effectively preventing cannibalism due to cramped space. A small aerator is installed in the middle of the enclosure, with its air pipe fixedly connected to the aeration pipe, which is also fixed to the bottom outer wall of the enclosure. The top of the air pipe extends out of the enclosure opening, and the pump is fixedly connected to the top of the air pipe. Therefore, once the pump is activated, the water inside the enclosure is aerated from the bottom, preventing oxygen deprivation and cannibalism in the crowded space, reducing crab mortality, limb loss, and decreased vitality, thus minimizing losses and overall aquaculture losses.

[0017] (2) In this utility model, the outlet ends of multiple traps can be gathered into a box of a net box assembly for catching and collecting crabs. An anti-climbing lintel is fixedly connected to the opening side of the box facing the water surface. The anti-climbing lintel can prevent crabs that have fallen from the square traps into the box from climbing out of the box along the inner wall of the box. Moreover, the anti-climbing lintel is a tetrahedron that fits into the four sides of the box opening. The upper inner wall of the anti-climbing lintel is provided with a smooth slope that is inclined towards the inside of the box, making it more difficult for crabs to climb out of the box. At the same time, the opening ends of four traps are connected to the connecting frame on the same box. Crabs in the four traps will crawl towards the box at the same time and finally fall into the box for collecting crabs. When there are many crabs in the box, the entire box can be taken out of the pond and the crabs can be collected, which can greatly improve the efficiency of catching crabs. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of a crab catching device according to the present invention; Figure 2 This is a partial structural diagram of a crab-catching device according to the present invention. Figure 1 ; Figure 3 This is a partial structural diagram of a crab-catching device according to the present invention. Figure 2 ; Figure 4 This is a partial structural diagram of a crab-catching device according to the present invention. Figure 3 ; Figure 5 This is a schematic diagram of the connecting frame of a crab catching device according to the present invention; Figure 6 This is a schematic diagram of the structure of a crab-catching device according to the present invention.

[0019] The attached figures are labeled as follows: 100. Cage assembly; 101. Cage body; 102. Suspension body; 103. Anti-climb lintel; 104. Connecting frame; 1041. Sleeve sleeve; 1042. Fixing base; 200. Aerator; 201. Pump; 202. Air pipe; 203. Aeration pipe; 300. Ground trap; 301. Trap body; 302. Crab trap opening; 303. Conical trap; 304. Square trap. Detailed Implementation

[0020] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention. Furthermore, the embodiments and features in the embodiments of the present invention can be combined with each other without conflict.

[0021] refer to Figures 1-6 As shown, this embodiment provides a crab harvesting device, characterized by including a net cage assembly 100. The net cage assembly 100 includes a box body 101 with one open side. An anti-climbing lintel 103 is fixedly connected to the open end of the box body 101. Multiple connecting frames 104 are fixedly connected to the upper part of the anti-climbing lintel 103. The connecting frames 104 are detachably connected to the front end of the bottom cage 300. An aerator 200 is fixedly connected to the box body 101. The bottom of the air pipe 202 of the aerator 200 is fixedly connected to the bottom surface of the box body 101 away from the open end. The air pipe 202 is fixedly connected to and communicates with an aeration pipe 203. The aeration pipe 203 is fixedly connected to the outer wall surface of the bottom surface of the box body 101. The top of the air pipe 202 extends out of the open end of the box body 101. A pump 201 is fixedly connected to the top of the air pipe 202.

[0022] In this invention, the problem of trapping crabs in high-density crab farming can be avoided by preventing trapping from overflowing, thus reducing losses for farmers. A connecting frame 104 is fixedly connected to the upper part of the net cage assembly 100. The open end of the trap 300 can be fitted onto the connecting frame 104, with the open end of the trap 300 (the square cage 304) facing inwards towards the box body 101. Crabs crawling in the trap 300 will fall into the box body 101 through the opening of the square cage 304. A ring of suspending bodies 102 is fixedly connected to the outer wall of the box body 101. The suspending bodies 102 have buoyancy in the pond, so the upper part of the box body 101 can float above the pond surface. Furthermore, the box body 101 is a cube composed of five net surfaces, so the lower part of the inner cavity of the box body 101 contains water, allowing crabs to fall into the box body 101. The water is collected centrally in the tank 101, which has a much larger volume than the bottom trap 300, effectively preventing crabs from killing each other due to the cramped space. Furthermore, a small aerator 200 is installed in the middle of the tank 101. The aerator 200's air pipe 202 is fixedly connected to the aeration pipe 203, which is fixedly connected to the outer wall of the bottom of the tank 101. The top of the air pipe 202 extends out of the opening of the tank 101, and the pump 201 is fixedly connected to the top of the air pipe 202. Therefore, once the pump 201 is started, it can aerate the water in the tank 101 from the bottom, preventing crabs from suffering from oxygen deficiency and cannibalism in the crowded space, reducing crab mortality, limb loss, and decreased vitality, and minimizing losses in crab populations and aquaculture.

[0023] Furthermore, the connecting frame 104 includes a fixing seat 1042, one end of which is fixedly connected to the outer wall of the anti-climb lintel 103, and the other end of which is fixedly connected to a sleeve 1041, the opening of which faces the middle of the box 101.

[0024] Furthermore, the front end of the ground cage 300 is provided with a conical cage 303, the pointed end of the conical cage 303 is fixedly connected and communicated with the square cage 304, and the square cage 304 is detachably sleeved in the sleeve cylinder 1041.

[0025] In this invention, the outlets of multiple traps 300 are gathered into a cage 101 of a net cage assembly 100 for catching and collecting crabs. An anti-climb lintel 103 is fixedly connected to the opening of the cage 101 facing the water surface. The anti-climb lintel 103 prevents crabs that have fallen from the square traps 304 into the cage 101 from climbing out of the cage 101 again along the inner wall of the cage 101. The anti-climb lintel 103 is a tetrahedron that fits against the four sides of the opening of the cage 101. The upper inner wall of the anti-climb lintel 103... The surface is provided with a smooth ramp that slopes inward toward the inside of the box 101, making it more difficult for crabs to climb out of the box 101. At the same time, the opening ends of four traps 300 are connected to the connecting frame 104 on the same box 101. Crabs in the four traps 300 will crawl toward the box 101 at the same time and eventually fall into the box 101 for collecting crabs. When there are a lot of crabs in the box 101, the entire box can be taken out of the pond and the crabs can be collected, which can greatly improve the efficiency of catching crabs.

[0026] Furthermore, the trap 300 includes multiple cage bodies 301 connected end to end, each cage body 301 having a crab-catching opening 302 on its side wall, and the cage body 301 closest to the box body 101 is fixedly connected and communicated with the end of the conical cage 303 away from the square cage 304.

[0027] In this utility model, according to actual needs, farmers select an appropriate number of cages 301, splice them end to end, and place them in the pond where crabs are raised. The crabs will enter the inner cavity of the cage 301 through the crab-catching opening 302 on the side wall of the cage 301 and will not easily escape. The use of the cage 301 to catch crabs in the pond is all existing technology and will not be described in detail here.

[0028] Furthermore, the length of the square cage 304 is greater than the length of the sleeve 1041.

[0029] In this invention, because the length of the square cage 304 is greater than the length of the connecting tube 1041, the square cage 304 can pass through the middle of the connecting tube 1041 and be fitted onto the connecting tube 1041 at its end. When the crabs crawl out of the ground cage 300 to the outlet of the square cage 304, the outer side of the outlet is the relatively smooth outer wall of the connecting tube 1041. Therefore, the crabs will not crawl back to the pond along the outer wall when they crawl out of the outlet, ensuring that all the crabs in the cage 301 can fall into the box 101 used to collect the crabs when they crawl out of the outlet.

[0030] Furthermore, the cage assembly 100 includes a suspension body 102, which surrounds the middle of the outer wall of the cage 101 and is fixedly connected to the outer wall of the cage 101.

[0031] Optionally, the suspension body 102 uses suspension foam and is attached to the outer wall of the box 101 after being coated with waterproof strong adhesive on the inner ring.

[0032] Optionally, the suspension body 102 uses a gel airbag, which is inflated and then attached to the outer wall of the box 101 with waterproof strong adhesive.

[0033] Furthermore, there are two aeration pipes 203, which are parallel to the two diagonals of the bottom surface of the box 101, and multiple air holes are evenly opened on the pipe wall of the aeration pipe 203.

[0034] In another embodiment, the connecting frame 104 is located on the side of the suspending body 102 away from the anti-climb lintel 103, that is, below the water surface on the lower side of the suspending body 102. The connecting frame 104 is fixedly connected to the outer wall of the box 101. A hole for the sleeve 1041 to pass through is opened on the wall of the box 101 on the lower side of the suspending body 102.

[0035] Optionally, the power supply for pump 201 is located on the pond bank and connected by wires. It uses a gel battery, which is maintenance-free, has good sealing properties, is suitable for aquaculture environments, and is more durable than ordinary lead-acid batteries. It is also equipped with a PWM type solar controller to control the start and stop of the small pump 201. It is economical, suitable for small systems, and has a high cost-performance ratio. It aerates and oxygenates the water in tank 101. This is existing technology and will not be described in detail. This can prevent the crabs from piling up too much in tank 101 and causing the cage to burst, thus reducing the loss of crabs during the crab farming, harvesting and fishing process.

[0036] Furthermore, the box 101 is a cube with one open side, consisting of five mesh surfaces.

[0037] Furthermore, the anti-climb lintel 103 is a tetrahedron that fits into the four sides of the opening of the box 101, and the upper inner wall surface of the anti-climb lintel 103 is provided with a smooth slope that slopes inward toward the inside of the box 101.

[0038] In this invention, the slope on the inner side of the anti-climb lintel 103 is further lowered by a vertical wall that is perpendicular to the horizontal plane, which can further prevent crabs that fall into the box 101 from climbing out along the inner wall.

[0039] Furthermore, there are four connecting frames 104, each of which is fixedly connected to one side of the corresponding anti-climb lintel 103.

Claims

1. A crab-catching device, characterized in that, The cage assembly (100) includes a cage body (101) with one open side. An anti-climb lintel (103) is fixedly connected to the open end of the cage body (101). Multiple connecting frames (104) are fixedly connected to the upper part of the anti-climb lintel (103). The connecting frames (104) are detachably connected to the front end of the ground cage (300). An aerator (200) is fixedly connected to the housing (101). The bottom of the air pipe (202) of the aerator (200) is fixedly connected to the bottom surface of the housing (101) away from the opening end. The air pipe (202) is fixedly connected to and connected to the aeration pipe (203). The aeration pipe (203) is fixedly connected to the outer wall surface of the bottom surface of the housing (101). The top of the air pipe (202) extends out of the opening end of the housing (101). The pump (201) is fixedly connected to the top of the air pipe (202).

2. The crab-catching device according to claim 1, characterized in that, The connecting frame (104) includes a fixed seat (1042), one end of which is fixedly connected to the outer wall of the anti-climb lintel (103), and the other end of which is fixedly connected to a sleeve (1041), the opening of which faces the middle of the box (101).

3. The crab-catching device according to claim 2, characterized in that, The ground cage (300) has a conical cage (303) at its front end. The pointed end of the conical cage (303) is fixedly connected and communicated with the square cage (304). The square cage (304) is detachably sleeved in the sleeve cylinder (1041).

4. The crab-catching device according to claim 3, characterized in that, The trap (300) includes multiple cage bodies (301) connected end to end. Each cage body (301) has a crab-catching opening (302) on its side wall. The cage body (301) closest to the box body (101) is fixedly connected and communicated with the end of the cone cage (303) away from the square cage (304).

5. The crab-catching device according to claim 3, characterized in that, The length of the square cage (304) is greater than the length of the sleeve (1041).

6. The crab-catching device according to claim 1, characterized in that, The cage assembly (100) includes a suspension body (102), which surrounds the middle of the outer wall of the cage (101) and is fixedly connected to the outer wall of the cage (101).

7. The crab-catching device according to claim 6, characterized in that, There are two aeration pipes (203), and the two aeration pipes (203) are parallel to the two diagonals of the bottom surface of the box (101), and multiple air holes are evenly opened on the pipe wall of the aeration pipe (203).

8. The crab-catching device according to claim 1, characterized in that, The box (101) is a cube with one open side, consisting of five mesh surfaces.

9. The crab-catching device according to claim 8, characterized in that, The anti-climb lintel (103) is a tetrahedron that fits into the four sides of the opening of the box (101). The upper inner wall of the anti-climb lintel (103) is provided with a smooth slope that is inclined toward the inside of the box (101).

10. The crab-catching device according to claim 9, characterized in that, There are four connecting frames (104), and each connecting frame (104) is fixedly connected to one side of the corresponding anti-climb lintel (103).

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