Cage device for polyculture of snails in crab pond and culture method

Abstract

The invention discloses a cage device for polyculture of snails in a crab pond, which comprises a culture cage body, snail culture cylinders, foldable insertion pieces, insertion piece adjusters and an electric screening assembly, the culture cage body is put into the crab pond, and the snail culture cylinders are mounted in the culture cage body; the foldable inserting piece is arranged on the outer wall of the breeding cage body, the upper end of the foldable inserting piece is connected with the inserting piece adjuster, the inserting piece adjuster is installed at the top of the breeding cage body, the electric screening assembly is arranged at the top of the breeding cage body, and the breeding cage body comprises a cage body, a cage cover, a handle, a floating ball fixing ring and a fixing buckle. The cage body comprises an outer frame and a movable bottom net movably arranged at the bottom of the outer frame, the outer frame is of a square structure defined by a plurality of PVC pipes, and the cage cover is arranged on the top of the cage body. By means of the crab pond polyculture cage device, ecological polyculture of crabs and snails can be achieved, the culture benefits of farmers are greatly improved, and the input cost of feed is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of aquaculture, and in particular to a hanging cage device and a culture method for polyculture of snails in a crab pond. Background Art

[0002] Aquaculture is the use of waters available for breeding (including planting) by humans. According to the ecological habits of the breeding objects and the requirements for the water environment conditions, aquaculture technology and facilities are used to engage in the breeding of aquatic economic animals and plants. It is one of the agricultural production sectors. According to the nature of the waters, it is divided into marine aquaculture and freshwater aquaculture. According to the breeding and planting objects, it is divided into fish, shrimps, crabs, shellfish, algae, water chestnuts, lotus, lotus roots, etc. Aquaculture is the production business of breeding aquatic economic animals and plants in suitable waters. It is an important part of fisheries. The period when humans engaged in aquaculture was later than the fishing industry that harvested natural aquatic resources. The emergence and development of aquaculture marked the enhancement of humans' ability to influence and control waters. With the development of aquaculture, the degree of intensification is also getting higher and higher. Crabs, as a high-value aquatic product, are favored by aquaculture farmers. Crab breeding requires special crab breeding ponds for breeding.

[0003] However, existing crab farming processes present several challenges. To ensure healthy crabs, regular feed must be added to the ponds. This manual feeding increases costs and labor, and can easily pollute water quality. Furthermore, there is a lack of ecologically sound crab farming equipment and methods. Therefore, a technical solution is needed to address these challenges. Summary of the Invention

[0004] The purpose of the present invention is to provide a hanging cage device and a breeding method for co-culturing snails in a crab pond, which solves the technical problems that, in order to ensure the healthy breeding of crabs, it is necessary to manually add feed to the breeding pond on a regular basis, the manual feed addition method increases the breeding cost and labor burden and easily pollutes the water quality, and there is a lack of ecological breeding devices and breeding methods for crab breeding.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solution: a hanging cage device for polyculture of snails in a crab pond, comprising a breeding cage body, a snail seed breeding cylinder, a foldable insert, an insert adjuster, and an electric screening assembly, wherein the breeding cage body is placed in a crab pond, the snail seed breeding cylinder is installed in the breeding cage body, the foldable insert is arranged on the outer wall of the breeding cage body and the upper end is connected to the insert adjuster, the insert adjuster is installed on the top of the breeding cage body, and the electric screening assembly is arranged on the top of the breeding cage body;

[0006] The breeding cage body includes a cage body, a cage cover, a handle, a float fixing ring and a fixing buckle. The cage body includes an outer frame and a movable bottom net movably arranged at the bottom of the outer frame. The outer frame is surrounded by a square structure by several groups of PVC pipes. The cage cover is arranged on the top of the cage body. The handles are divided into two groups and symmetrically installed on the short sides of the cage body. The float fixing rings are divided into several groups and symmetrically installed on the long sides of the cage body. The fixing buckles are divided into four groups and installed on the cage cover.

[0007] The snail seed breeding cylinder includes a cylinder body, a cylinder cover and a spacer. The cylinder body is placed in a cage body and a snail seed area is formed inside. The cylinder cover is arranged on the cylinder body. The spacers are divided into several groups and are evenly installed on the periphery of the cylinder body. The outer ends of several groups of the spacers are connected to the cage body.

[0008] The foldable insert is composed of several groups of insert bodies, which are distributed in a square shape and are connected to connecting ropes at both ends, and a spacing groove is formed between two adjacent groups of insert bodies;

[0009] The insert adjuster includes a column, a connecting frame, a reeling adjuster and a traction rope. The column is vertically fixed to the top of the cage. The connecting frame is divided into two groups and is horizontally installed on the top of the column. The outer end of the connecting frame is connected to the reeling adjuster, and the reeling adjuster is connected to the foldable insert through the traction rope.

[0010] The electric screening assembly includes a mounting base, a lateral adjustment assembly and a screening assembly. The mounting base is provided with a mounting opening and two groups of guide grooves are symmetrically provided on the inner wall. The movable bottom net is slidably arranged in the mounting opening. The lateral adjustment assembly is divided into two groups and is respectively installed in the two groups of guide grooves. The upper end of the screening assembly is built into the mounting opening.

[0011] As a preferred embodiment of the present invention, the surfaces of the outer frame, the cylinder and the movable bottom net are formed with several groups of mesh holes, the mesh holes on the outer frame have a diameter of 0.8 cm, the mesh holes on the cylinder have a diameter of 1.2 cm-1.4 cm, and the mesh holes on the movable bottom net have a diameter of 0.2 cm.

[0012] As a preferred embodiment of the present invention, the fixing buckle is formed into a cross-shaped structure by two groups of plates, and the lower end of the fixing buckle is rotatably connected to the cage cover.

[0013] As a preferred embodiment of the present invention, the winding regulator includes a shell, a motor 1 and a winding wheel. The shell is fixed to the outer end of the connecting frame, the motor 1 is installed in the shell and the power output end is connected to the winding wheel, and the upper end of the traction rope is wound around the winding wheel.

[0014] As a preferred embodiment of the present invention, the lateral adjustment assembly includes a sealed housing, a second motor, a screw and a slider. The sealed housing is fixed to the end of the mounting base plate. The second motor is built into the sealed housing and the power output end is connected to the screw. The screw is rotatably arranged in the guide groove. The slider is threadedly embedded in the screw and slidably arranged in the guide groove. The inner end of the slider is connected to the edge of the movable bottom net.

[0015] As a preferred embodiment of the present invention, the screening component includes a frame, screen 1, screen 2, a switch plate and a vibrator. Screen 1 and screen 2 are arranged parallel to each other on the inner wall of the frame and have several groups of sieve holes on the surface. The diameter of the sieve holes on screen 1 is 1.8 cm, and the diameter of the sieve holes on screen 2 is 0.8 cm. The switch plates are divided into two groups and are respectively installed on the left end of the frame. The two groups of switch plates are respectively located on one side of screen 1 and screen 2. The vibrators are divided into four groups and are respectively located on the outside of the frame.

[0016] As a preferred embodiment of the present invention, the vibrator includes a sealing cover and a vibration motor installed in the sealing cover, the sealing cover is fixed to the edge of the mounting base, the vibration end of the vibration motor is connected to a fixing plate, and the fixing plate is fixed to the edge of the outer frame.

[0017] As a preferred embodiment of the present invention, the specific breeding method is as follows:

[0018] Crab breeding ponds are planted with grass and fertilized normally. Before the Qingming Festival, several snail cage breeding areas are designed in the pond along the short side of the pond. The breeding area avoids the aquatic plant planting area. The width of the breeding area is twice the width of the cage, and the length is set according to the length of the short side of the pond. Both sides are 0.5m-1m away from the shore. The four corners of the breeding area are fixed to the bottom of the pond with bamboo poles or stainless steel pipes, and then connected with ropes to form a rectangular area. Cages are placed in the area, two horizontally, and the number of cages in the vertical direction is determined according to the size of the area. This design can prevent the cages from moving and floating due to wind, waves or water currents, and it is convenient to take the cages out for operation. A proper amount of floats are hung on the long side of the cage to ensure that the bottom of the cage does not touch the pond bottom and occupy the crab crawling space. 100-150 cages are placed per acre of crab pond;

[0019] After the Qingming Festival, 1 kg of seed snails with a shell width of more than 1.6 cm are placed in the snail seed area of each hanging cage. The mesh of the snail seed area is larger, 1.2 cm-1.4 cm. The small snails bred by the seed snails can fall into the breeding area through the wide mesh of the snail seed area. The mesh of the four walls of the breeding area is 0.8 cm. At this time, inserts with a mesh of 0.2 cm are inserted along the four walls of the breeding area to prevent the small snails from being transferred into the pond. The breeding of small snails continues until the end of May and the beginning of June. Fermented biofertilizer or organic fertilizer is used to fertilize the water, and corn flour is fed as cheap feed;

[0020] In addition, ponds are set up for crab farming. In early March, 2,000 to 2,500 crabs are released per mu for conventional farming.

[0021] At the end of May and the beginning of June, after the crabs have two shells, they are stocked into snail mixed culture ponds at a rate of 800-1000 per mu for conventional crab farming. At this time, the inserts in the hanging cage culture area are removed, and the mesh outside the culture area is larger. Snails with shell widths less than 0.8 cm are directly dropped into the crab pond and used as a source of animal protein for crabs. Snails with shell widths greater than 0.8 cm are further screened, and those with shell widths greater than 1.8 cm are sold. The rest are continued to be farmed until they are larger than 1.8 cm.

[0022] During the crab breeding period, depending on the crabs' feeding habits, snails less than 1.8 cm in length in the hanging cage can be released into the crab pond in the later stage.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. The present invention designs a hanging cage device specially used for mixed culture in crab ponds. The hanging cage device is arranged in a crab breeding pond and is used for breeding snails. The hanging cage device comprises a breeding cage body, a snail seed breeding tube, a foldable insert, an insert regulator and an electric screening assembly. The snail seeds are put into the snail seed breeding tube for breeding and produced in the breeding cage. During the breeding period of small snails, the foldable insert is lowered by the insert regulator and placed on the periphery of the breeding cage body to prevent the small snails from falling due to the aperture of the breeding cage. When snails need to be put as animal bait during the crab breeding period, the foldable insert is lifted and separated from the breeding cage body by the insert regulator. The large aperture in the breeding area can allow small snails to fall into the pond to be supplied to crabs. In addition, the snails can be screened by the electric screening assembly, and three-level screening is performed according to the specifications of the snails. The snails are sold, continued to be bred, and fed to crabs according to their sizes.

[0025] 2. The crab pond polyculture hanging cage device designed by the present invention can realize the ecological polyculture of crabs and snails, greatly improving the breeding efficiency of farmers and reducing the input cost of feed. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is the overall structural diagram of the present invention;

[0027] Figure 2 This is a structural diagram of the foldable insert in the separated state according to the present invention;

[0028] Figure 3 This is a structural diagram of the electric screening assembly of the present invention;

[0029] Figure 4 This is a structural diagram of the screening component of the present invention;

[0030] Figure 5It is a schematic diagram of the cage placement method of the present invention.

[0031] In the figure: 1. Cage body; 2. Cage cover; 3. Handle; 4. Float fixing ring; 5. Fixing buckle; 6. Outer frame; 7. Movable bottom net; 8. Cylinder body; 10. Cylinder cover; 11. Spacer; 12. Screw seed area; 13. Insert body; 14. Connecting rope; 15. Spacing groove; 16. Post; 17. Connecting frame; 18. Winding regulator; 19. Pulling rope; 20. Mounting base; 21. Lateral adjustment component; 22. Screening component; 23. Mounting port; 24. Guide groove; 25. Mesh; 26. Shell; 27. Motor 1; 28. Winding wheel; 29. Sealing shell; 30. Motor 2; 31. Screw; 32. Slider; 33. Frame; 34. Screen 1; 35. Screen 2; 36. Switch board; 37. Vibrator; 38. Screen hole; 39. Sealing cover; 40. Vibration motor; 41. Fixing plate. DETAILED DESCRIPTION

[0032] 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.

[0033] See also Figure 1-5 The present invention provides a technical solution: a hanging cage device for mixed culture of snails in a crab pond, comprising a culture cage body, a snail seed culture cylinder, a foldable insert, an insert adjuster, and an electric screening assembly. The culture cage body is placed in the crab pond, the snail seed culture cylinder is installed in the culture cage body, the foldable insert is arranged on the outer wall of the culture cage body and the upper end is connected to the insert adjuster, the insert adjuster is installed on the top of the culture cage body, and the electric screening assembly is arranged on the top of the culture cage body.

[0034] In the process of snail breeding, the seed snails are put into the snail breeding tube and reproduced. The bred snail seeds crawl out along the mesh of the snail breeding tube and enter the breeding area of the cage body 1. At this time, the foldable insert is located on the outside of the cage body 1 to prevent the small snails from falling. When the small snails need to be fed to the crabs, the motor 1 27 drives the winding wheel 28 to rotate. The winding wheel 28 can drive the traction rope 19 to reel in the process of rotation, and then the position of the foldable insert is lifted and adjusted to open the mesh of the cage body 1. At this time, it is convenient to discharge the small snails. When the snails need to be screened, the motor 2 30 is first used to drive the screw 31 to rotate. The screw 31 rotates during the rotation. During the movement, the slider 32 is driven to move along the guide groove 24. During the movement, the movable bottom net 7 is moved horizontally and separated from the bottom of the cage body 1. Then the snails in the cage body 1 fall onto the screening component 22. The vibration output of the vibration motor 40 acts on the fixed plate 21 and then drives the frame 33, screen 1 34, and screen 2 35 to rotate synchronously for screening. The screen 1 34 acts on the lower end of the snail breeding tube during the up and down vibration process, driving the snail breeding tube and the cage body 1 to resonate, and then vibrating the snails adhered to the breeding cage body onto the screen 1 34, and screened and processed through the screening component 22. After screening, the staff can export the snails through the switch plate 36.

[0035] The breeding cage body includes a cage body 1, a cage cover 2, a handle 3, a float fixing ring 4 and a fixing buckle 5. The cage body 1 includes an outer frame 6 and a movable bottom net 7 movably arranged at the bottom of the outer frame 6. The outer frame 6 is surrounded by several groups of PVC pipes to form a square structure. The cage cover 2 is arranged on the top of the cage body 1. The handles 3 are divided into two groups and are symmetrically installed on the short sides of the cage body 1. The float fixing rings 4 are divided into several groups and are symmetrically installed on the long sides of the cage body 1. The fixing buckles 5 are divided into four groups and are installed on the cage cover 2. The cage cover 2 is made of cooked plastic and can withstand sun exposure when exposed to the water. The float fixing ring 4 is connected to the float.

[0036] The snail seed breeding cylinder includes a cylinder body 8, a cylinder cover 10 and a spacer 11. The cylinder body 8 is built into the cage body 1 and has a snail seed area 12 formed therein. The cylinder cover 10 is arranged on the cylinder body 8. The spacers 11 are divided into several groups and evenly installed on the periphery of the cylinder body 8. The outer ends of the several groups of spacers 11 are connected to the cage body 1. The spacers 11 are used for snail attachment, for placing seed snails, and for allowing small snails to enter and exit through the mesh on the surface.

[0037] The foldable insert is composed of several groups of insert bodies 13. The groups of insert bodies 13 are distributed in a square shape and are connected to connecting ropes 14 at both ends. A spacing groove 15 is formed between two adjacent groups of insert bodies 13 to reduce the aperture of the cage 1 and prevent the snails from falling.

[0038] The insert adjuster includes a column 16, a connecting frame 17, a reeling adjuster 18 and a traction rope 19. The column 16 is vertically fixed to the top of the cage 1. The connecting frame 17 is divided into two groups and is horizontally installed on the top of the column 16. The outer end of the connecting frame 17 is connected to the reeling adjuster 18. The reeling adjuster 18 is connected to the foldable insert through the traction rope 19. The reeling adjuster 18 drives the traction rope 19 to retract and extend, thereby adjusting the foldable insert longitudinally.

[0039] The electric screening component includes a mounting base 20, a lateral adjustment component 21 and a screening component 22. A mounting opening 23 is provided on the mounting base 20 and two groups of guide grooves 24 are symmetrically provided on the inner wall. The movable bottom net 7 is slidably set in the mounting opening 23. The lateral adjustment component 21 is divided into two groups and is respectively installed in the two groups of guide grooves 24. The upper end of the screening component 22 is built into the mounting opening 23. The motor used is a submersible motor. The lateral adjustment component 21 is used to perform lateral adjustment on the movable bottom net 7, and the screening component 22 is used to screen the snails.

[0040] Further improvement, such as Figure 2 As shown, the surfaces of the outer frame 6, the cylinder 8 and the movable bottom net 7 are all formed with a plurality of groups of mesh holes 25. The diameter of the mesh holes 25 located on the outer frame 6 is 0.8 cm, the diameter of the mesh holes 25 located on the cylinder 8 is 1.2 cm-1.4 cm, and the diameter of the mesh holes 25 located on the movable bottom net 7 is 0.2 cm.

[0041] Further improvement, such as Figure 2 As shown, the fixing buckle 5 is formed into a cross-shaped structure by two groups of plates. The lower end of the fixing buckle 5 is rotatably connected to the cage cover 2. The fixing buckle 5 is inserted into the mesh of the sunshade net to limit the sunshade net.

[0042] Further improvement, such as Figure 2 As shown, the winding regulator 18 includes a shell 26, a motor 27 and a winding wheel 28. The shell 26 is fixed to the outer end of the connecting frame 17. The motor 27 is installed in the shell 26 and the power output end is connected to the winding wheel 28. The upper end of the traction rope 19 is wound around the winding wheel 28, and the winding wheel 28 is driven to rotate by the motor 27. During the rotation, the winding wheel 28 can drive the traction rope 19 to be retracted and released, thereby adjusting the position of the foldable insert.

[0043] Further improvement, such as Figure 3As shown, the lateral adjustment component 21 includes a sealed housing 29, a second motor 30, a screw 31 and a slider 32. The sealed housing 29 is fixed to the end of the mounting base 20. The second motor 30 is built into the sealed housing 29 and the power output end is connected to the screw 31. The screw 31 is rotatably set in the guide groove 24. The slider 32 is threadedly embedded on the screw 31 and slidably set in the guide groove 24. The inner end of the slider 32 is connected to the edge of the movable bottom net 7. The second motor 30 drives the screw 31 to rotate. During the rotation, the screw 31 drives the slider 32 to move along the guide groove 24, and the movable bottom net 7 is adjusted laterally during the movement.

[0044] Further improvement, such as Figure 4 As shown, the screening component 22 includes a frame 33, a screen 1 34, a screen 2 35, a switch plate 36 and a vibrator 37. The screen 1 34 and the screen 2 35 are arranged parallel to the inner wall of the frame 33 and have several groups of sieve holes 38 on the surface. The diameter of the sieve holes 38 on the screen 1 34 is 1.8 cm, and the diameter of the sieve holes 38 on the screen 2 35 is 0.8 cm. The switch plates 36 are divided into two groups and are respectively installed on the left end of the frame 33. The two groups of switch plates 36 are respectively located on one side of the screen 1 34 and the screen 2 35. The vibrators 37 are divided into four groups and are respectively located on the outside of the frame 33. The snails are screened according to their size through the screen 1 34 and the screen 2 35. After screening, the staff can export the snails through the switch plate 36.

[0045] Specifically, the vibrator 37 includes a sealing cover 39 and a vibration motor 40 installed in the sealing cover 39. The sealing cover 39 is fixed to the edge of the mounting base 20. The vibration end of the vibration motor 40 is connected to a fixed plate 41. The fixed plate 41 is fixed to the edge of the outer frame 6. The vibration output of the vibration motor 40 acts on the fixed plate 21 to drive the frame 33, screen 1 34, and screen 2 35 to rotate synchronously for screening. During the vibration process, screen 1 34 acts on the lower end of the snail breeding tube, driving the snail breeding tube and the cage body 1 to resonate, and then vibrating the snails adhered to the breeding cage body onto the screen 1 34, and screening and processing are carried out through the screening component 22.

[0046] When using: The specific breeding methods are as follows:

[0047] Crab breeding ponds are planted with grass and fertilized normally. Before the Qingming Festival, several snail cage breeding areas are designed in the pond along the short side of the pond. The breeding area avoids the aquatic plant planting area. The width of the breeding area is twice the width of the cage, and the length is set according to the length of the short side of the pond. Both sides are 0.5m-1m away from the shore. The four corners of the breeding area are fixed to the bottom of the pond with bamboo poles or stainless steel pipes, and then connected with ropes to form a rectangular area. Cages are placed in the area, two horizontally, and the number of cages in the vertical direction is determined according to the size of the area. This design can prevent the cages from moving and floating due to wind, waves or water currents, and it is convenient to take the cages out for operation. A proper amount of floats are hung on the long side of the cage to ensure that the bottom of the cage does not touch the pond bottom and occupy the crab crawling space. 100-150 cages are placed per acre of crab pond;

[0048] After the Qingming Festival, 1 kg of seed snails with a shell width of more than 1.6 cm are placed in the snail seed area of each hanging cage. The mesh of the snail seed area is larger, 1.2 cm-1.4 cm. The small snails bred by the seed snails can fall into the breeding area through the wide mesh of the snail seed area. The mesh of the four walls of the breeding area is 0.8 cm. At this time, inserts with a mesh of 0.2 cm are inserted along the four walls of the breeding area to prevent the small snails from being transferred into the pond. The breeding of small snails continues until the end of May and the beginning of June. Fermented biofertilizer or organic fertilizer is used to fertilize the water, and corn flour is fed as cheap feed;

[0049] In addition, ponds are set up for crab farming. In early March, 2,000 to 2,500 crabs are released per mu for conventional farming.

[0050] At the end of May and the beginning of June, after the crabs have two shells, they are stocked into snail mixed culture ponds at a rate of 800-1000 per mu for conventional crab farming. At this time, the inserts in the hanging cage culture area are removed, and the mesh outside the culture area is larger. Snails with shell widths less than 0.8 cm are directly dropped into the crab pond and used as a source of animal protein for crabs. Snails with shell widths greater than 0.8 cm are further screened, and those with shell widths greater than 1.8 cm are sold. The rest are continued to be farmed until they are larger than 1.8 cm.

[0051] During the crab breeding period, depending on the crabs' feeding habits, snails less than 1.8 cm in length in the hanging cage can be released into the crab pond in the later stage.

[0052] In the description of the present invention, it should be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inside", "front", "center", "both ends", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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 the present invention.

[0053] In addition, the terms "first", "second", "third" and "fourth" are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second", "third" and "fourth" may explicitly or implicitly include at least one such feature.

[0054] In the present invention, unless otherwise clearly stipulated and limited, the terms "install", "set", "connect", "fix", "screw" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated 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; it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the present invention according to the specific circumstances.

[0055] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or substitute equivalents for some of the technical features. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A hanging cage device for polyculture of snails in crab ponds, characterized by: The invention comprises a breeding cage body, a snail breeding cylinder, a foldable insert, an insert adjuster and an electric screening assembly. The breeding cage body is placed in a crab pond, the snail breeding cylinder is installed in the breeding cage body, the foldable insert is arranged on the outer wall of the breeding cage body and the upper end is connected to the insert adjuster, the insert adjuster is installed on the top of the breeding cage body, and the electric screening assembly is arranged on the top of the breeding cage body. The breeding cage body comprises a cage body (1), a cage cover (2), a handle (3), a float fixing ring (4) and a fixing buckle (5); the cage body (1) comprises an outer frame (6) and a movable bottom net (7) movably arranged at the bottom of the outer frame (6); the outer frame (6) is surrounded by a plurality of groups of PVC pipes to form a square structure; the cage cover (2) is arranged on the top of the cage body (1); the handle (3) is divided into two groups and symmetrically installed on the short sides of the cage body (1); the float fixing ring (4) is divided into several groups and symmetrically installed on the long sides of the cage body (1); the fixing buckle (5) is divided into four groups and installed on the cage cover (2); The snail seed breeding cylinder comprises a cylinder body (8), a cylinder cover (10) and a spacer (11); the cylinder body (8) is built into a cage body (1) and has a snail seed area (12) formed therein; the cylinder cover (10) is arranged on the cylinder body (8); the spacers (11) are divided into several groups and are evenly installed on the periphery of the cylinder body (8); the outer ends of several groups of the spacers (11) are connected to the cage body (1); The foldable insert is composed of a plurality of insert bodies (13), the plurality of insert bodies (13) are distributed in a square shape and are connected to connecting ropes (14) at both ends, and a spacing groove (15) is formed between two adjacent groups of insert bodies (13); The insert adjuster comprises a column (16), a connecting frame (17), a reeling adjuster (18) and a traction rope (19), wherein the column (16) is vertically fixed to the top of the cage (1), the connecting frame (17) is divided into two groups and horizontally installed on the top of the column (16), the outer end of the connecting frame (17) is connected to the reeling adjuster (18), and the reeling adjuster (18) is connected to the foldable insert via the traction rope (19); The electric screening assembly comprises a mounting base (20), a lateral adjustment assembly (21) and a screening assembly (22); the mounting base (20) is provided with a mounting opening (23) and the inner wall is symmetrically provided with two groups of guide grooves (24); the movable bottom net (7) is slidably arranged in the mounting opening (23); the lateral adjustment assembly (21) is divided into two groups and is respectively installed in the two groups of guide grooves (24); the upper end of the screening assembly (22) is built into the mounting opening (23).

2. The hanging cage device for polyculture of snails in a crab pond according to claim 1, wherein: The surfaces of the outer frame (6), the cylinder (8) and the movable bottom net (7) are all formed with a plurality of groups of mesh holes (25). The mesh holes (25) located on the outer frame (6) have a diameter of 0.8 cm, the mesh holes (25) located on the cylinder (8) have a diameter of 1.2 cm to 1.4 cm, and the mesh holes (25) located on the movable bottom net (7) have a diameter of 0.2 cm.

3. The hanging cage device for polyculture of snails in a crab pond according to claim 1, characterized in that: The fixing buckle (5) is formed into a cross-shaped structure by two groups of plates, and the lower end of the fixing buckle (5) is rotatably connected to the cage cover (2).

4. The hanging cage device for polyculture of snails in a crab pond according to claim 1, characterized in that: The winding regulator (18) includes a housing (26), a motor (27) and a winding wheel (28), wherein the housing (26) is fixed to the outer end of the connecting frame (17), the motor (27) is installed in the housing (26) and the power output end is connected to the winding wheel (28), and the upper end of the traction rope (19) is wound around the winding wheel (28).

5. The hanging cage device for polyculture of snails in crab ponds according to claim 2, characterized in that: The lateral adjustment assembly (21) includes a sealed housing (29), a second motor (30), a screw (31) and a slider (32), wherein the sealed housing (29) is fixed to the end of the mounting base (20), the second motor (30) is built into the sealed housing (29) and the power output end is connected to the screw (31), the screw (31) is rotatably arranged in the guide groove (24), the slider (32) is threadedly embedded on the screw (31) and slidably arranged in the guide groove (24), and the inner end of the slider (32) is connected to the edge of the movable bottom net (7).

6. The hanging cage device for polyculture of snails in crab ponds according to claim 1, characterized in that: The screening assembly (22) includes a frame (33), a screen 1 (34), a screen 2 (35), a switch plate (36) and a vibrator (37). The screen 1 (34) and the screen 2 (35) are arranged parallel to each other on the inner wall of the frame (33) and have a plurality of groups of sieve holes (38) on their surfaces. The diameter of the sieve holes (38) on the screen 1 (34) is 1.8 cm, and the diameter of the sieve holes (38) on the screen 2 (35) is 0.8 cm. The switch plates (36) are divided into two groups and are respectively installed at the left end of the frame (33). The two groups of switch plates (36) are respectively located on one side of the screen 1 (34) and the screen 2 (35). The vibrator (37) is divided into four groups and is respectively located outside the frame (33).

7. The hanging cage device for polyculture of snails in crab ponds according to claim 6, characterized in that: The vibrator (37) includes a sealing cover (39) and a vibration motor (40) installed in the sealing cover (39), wherein the sealing cover (39) is fixed to the edge of the mounting base (20), and the vibration end of the vibration motor (40) is connected to a fixing plate (41), and the fixing plate (41) is fixed to the edge of the outer frame (6).

8. The method for cultivating snails in a crab pond using a hanging cage device according to any one of claims 1 to 7, wherein: The specific breeding methods are as follows: Crab breeding ponds are planted with grass and fertilized normally. Before the Qingming Festival, several snail cage breeding areas are designed in the pond along the short side of the pond. The breeding area avoids the aquatic plant planting area. The width of the breeding area is twice the width of the cage, and the length is set according to the length of the short side of the pond. Both sides are 0.5m-1m away from the shore. The four corners of the breeding area are fixed to the bottom of the pond with bamboo poles or stainless steel pipes, and then connected with ropes to form a rectangular area. Cages are placed in the area, two horizontally, and the number of cages in the vertical direction is determined according to the size of the area. This design can prevent the cages from moving and floating due to wind, waves or water currents, and it is convenient to take the cages out for operation. A proper amount of floats are hung on the long side of the cage to ensure that the bottom of the cage does not touch the pond bottom and occupy the crab crawling space. 100-150 cages are placed per acre of crab pond; After the Qingming Festival, 1 kg of seed snails with a shell width of more than 1.6 cm are placed in the snail seed area of each hanging cage. The mesh of the snail seed area is larger, 1.2 cm-1.4 cm. The small snails bred by the seed snails can fall into the breeding area through the wide mesh of the snail seed area. The mesh of the four walls of the breeding area is 0.8 cm. At this time, inserts with a mesh of 0.2 cm are inserted along the four walls of the breeding area to prevent the small snails from being transferred into the pond. The breeding of small snails continues until the end of May and the beginning of June. Fermented biofertilizer or organic fertilizer is used to fertilize the water, and corn flour is fed as cheap feed; In addition, ponds are set up for crab farming. In early March, 2,000 to 2,500 crabs are released per mu for conventional farming. At the end of May and the beginning of June, after the crabs have two shells, they are stocked into snail mixed culture ponds at a rate of 800-1000 per mu for conventional crab farming. At this time, the inserts in the hanging cage culture area are removed, and the mesh outside the culture area is larger. Snails with shell widths less than 0.8 cm are directly dropped into the crab pond and used as a source of animal protein for crabs. Snails with shell widths greater than 0.8 cm are further screened, and those with shell widths greater than 1.8 cm are sold. The rest are continued to be farmed until they are larger than 1.8 cm. During the crab breeding period, depending on the crabs' feeding habits, snails less than 1.8 cm in length in the hanging cage can be released into the crab pond in the later stage.

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