Folding crab pot

Abstract

The utility model relates to a folding crab cage which comprises a cage bottom net 1, a plurality of side nets 2 movably connected with the cage bottom net 1, a central support 5 arranged on the cage bottom net 1 and lifting ropes 3 connected with the side nets 2 through connecting ropes 4. When the lifting rope 3 is not stressed, the side net 2 and the cage bottom net 1 form a tiled plane structure; when the lifting rope 3 is lifted upwards, the side net 2 and the cage bottom net 1 jointly form a cage-shaped structure with an opening in the top under the limitation of the center support 5. After the folding crab pot is folded, the volume of the folding crab pot is only 22% of that of the bucket-shaped crab pot, so that the occupied area of the crab pot is reduced. The frame is made of twisted steel, so that the weight of the cage bottom net 1 is increased, the foldable crab cage can be used for fishing in an offshore area with sea waves below 2 feet, and the influence of the sea waves and torrent on crab fishing of the crab cage is reduced. The center support 5 can be connected with a bait rod 24 or a camera support 20, bait putting points are increased, the abundance of crabs in water and the cage entering condition of the crabs are observed in real time, and the crab fishing efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of fishing tools, and particularly relates to a foldable crab cage. Background Art

[0002] Common non-commercial crab fishing methods include:

[0003] 1. Double Ring Crab Trap Steel Ring Crab (Announcement No. Item 10060-001);

[0004] 2. Rectangular Castable Crab Trap (Publication No. B003OB7IX4);

[0005] 3. Offshore Angler Square Crab Trap (WebID: 100959768);

[0006] 4. Marathon Pyramid Crab Trap (publication number B07ZL5CWBJ);

[0007] 5. Other crab cages (such as those with announcement number B001BM2RPM).

[0008] Two-ring crab traps are very light, making them unsuitable for fishing in rough seas or rivers with rapids. They are also difficult to place on uneven sea or river beds, resulting in low crab-catching efficiency. Throwable crab traps are even less efficient because the traps are small and crabs easily escape. Square and pyramid crab traps are effective for offshore anglers, but they are bulky and lightweight, making them difficult to use in rough seas or rapids. Other methods share the same basic principle: the traps are left in the water for extended periods, waiting for crabs to enter. This results in low crab-catching efficiency. Furthermore, existing methods often require fixed bait placement, which also impacts efficiency. Finally, none of these methods offer the option of installing cameras. Utility Model Content

[0009] The purpose of the utility model is to provide a crab catching device, which can improve the crab catching efficiency, withstand the influence of 1-2 feet waves or rapids, and has a small size, is easy to carry, and can be installed with accessories such as cameras.

[0010] To achieve the above objectives, the technical solution adopted by the present invention is a foldable crab cage, comprising a cage bottom net and a plurality of side nets movably connected to the cage bottom net, a central bracket arranged on the cage bottom net, and a lifting rope connected to the side nets via a connecting rope; when the lifting rope is not under force, the side nets and the cage bottom net form a flat planar structure; when the lifting rope is lifted upward, the side nets, under the restraint of the central bracket, together with the cage bottom net form a cage-like structure with an open top.

[0011] further,

[0012] The cage bottom net is composed of a square first metal frame and a first metal net arranged on the first metal frame; the first metal frame is made of threaded steel bars;

[0013] A first bolt is provided on each side of the first metal frame. The first bolt is located in the plane formed by the first metal frame and is perpendicular to the side of the first metal frame. Each first bolt is equipped with a first nut. The first bolt and the first nut are used to position the center bracket.

[0014] The first metal mesh is arranged on the first metal frame by electric welding or mesh wire folding and winding.

[0015] Furthermore, there are four side nets, which correspond one to one to the four sides of the cage bottom net; the side nets are composed of an isosceles trapezoidal second metal frame and a second metal net arranged on the second metal frame; the second metal frame is made of steel wire, and the upper bottom is larger than the lower bottom; the second metal net is arranged on the second metal frame by electric welding or mesh wire folding and winding.

[0016] further,

[0017] The lower bottom of the side net is connected to the edge of the cage bottom net through two connecting rings made of metal wires. The side nets can rotate with the edge of the cage bottom net as an axis through the connecting rings, and the four side nets can be folded in half in pairs; the connecting rings are elliptical;

[0018] The connecting ring is fixed to the edge of the cage bottom net in three ways:

[0019] The first method is to wind and connect the metal wire of the connecting ring with the first metal mesh of the cage bottom mesh;

[0020] The second method is to set two anchor points on the inner side of the edge of the cage bottom net, drill two fixing holes on each anchor point, and the metal wire of the connecting ring is wound and connected to the edge of the cage bottom net through the fixing holes;

[0021] The third method is to directly weld and fix the connecting ring to the inner side of the first metal frame.

[0022] further,

[0023] The central support includes a first support and a second support;

[0024] The first bracket and the second bracket are each made of two inverted L-shaped metal rods, each of which includes a first bent section and a second bent section. The first bent sections of the two inverted L-shaped metal rods are butted together to form a straight crossbeam; the two second bent sections form support rods at both ends of the crossbeam, and the support rods and the crossbeam form an isosceles trapezoid with an open lower base, wherein the upper base of the isosceles trapezoid is larger than the lower base.

[0025] A first fixing ring is provided at the bottom end of the support rod, the axis of the center of the first fixing ring is parallel to the crossbeam, and the first fixing ring matches the first bolt; the first bracket and the second bracket are provided with a total of four first fixing rings, which correspond one-to-one to the four first bolts on the cage bottom net;

[0026] A third nut is further provided at the center of the crossbeam of the first bracket. The ends of the first bent sections of the two inverted L-shaped metal rods constituting the first bracket are welded to the outer surface of the third nut, and the rods are connected together by the third nut to form the crossbeam. The axis of the third nut is perpendicular to the crossbeam and parallel to the plane of the isosceles trapezoid formed by the first bracket.

[0027] A second bolt is provided at the central position of the crossbeam of the first bracket, the second bolt is located in the plane of the isosceles trapezoid of the first bracket, perpendicular to the crossbeam, and the bottom end is welded to the upper surface of the third nut; the second bolt is equipped with a matching second nut; the third nut is located below the bottom end of the second bolt, the third nut is coaxially aligned with the second bolt, and the threaded opening on the lower surface of the third nut is used to connect accessories; a second fixing ring is provided at the central position of the crossbeam of the second bracket, the ends of the first bent sections of the two inverted L-shaped metal rods constituting the second bracket are welded to the outer surface of the second fixing ring, and are connected together through the second fixing ring to form the crossbeam; the axis of the second fixing ring is perpendicular to and parallel to the crossbeam. The first bracket and the second bracket are connected together by the second fixing ring, the second bolt and the second nut, and then the first fixing ring at the bottom end of the support rod of the first bracket and the second bracket is connected with the first bolt and the first nut on the edge of the cage bottom net, so that the first bracket and the second bracket are connected to form a cross-shaped central bracket perpendicular to each other, and the four support rods on the first bracket and the second bracket correspond to one side net respectively, and are restricted to the outside of the central bracket when the side net is flipped up as the lifting rope is lifted, thereby forming a cage-like structure with an open top together with the cage bottom net.

[0028] Furthermore, a connecting rope is provided on each side net, and the specifications of each connecting rope are consistent. The bottom end of the connecting rope is connected to the central position of the upper bottom of the isosceles trapezoidal side net; the top ends of all the connecting ropes are connected to the tail end of the lifting rope.

[0029] Furthermore, a third fixing ring is provided at the top end of all the connecting ropes, and a fourth fixing ring is provided at the tail end of the lifting rope, and the connection between the top end of the connecting rope and the tail end of the lifting rope is achieved through the fourth fixing ring and the third fixing ring; the connection method between the fourth fixing ring and the third fixing ring is a knot connection, a spring hook connection or a quick chain connection.

[0030] Furthermore, it also includes a camera bracket, which is composed of two parallel metal wires, and a third bolt is fixedly connected and arranged at the top ends of the two metal wires. The third bolt is parallel to the two metal wires, and the bottom end is fixedly connected to the top ends of the two metal wires. The third bolt matches the third nut, and the camera bracket can be set on the center bracket through the third bolt and the third nut; two limit blocks are also provided on each of the metal wires, and the limit blocks are used to cooperate with the adjustable worm gear hose clamp to fix the camera on the camera bracket.

[0031] Furthermore, it also includes a bait rod, which is used to hang a bait cage; the bait rod is a metal rod, and a plurality of through holes are evenly arranged on the bait rod along the axial direction, and a clamp is set through the through holes, and the bait cage is hung on the bait rod through the clamp; a fourth bolt is provided at the top end of the bait rod, and the fourth bolt is coaxial with the bait rod, and the fourth bolt matches the third nut, and the bait rod can be set on the center bracket through the fourth bolt and the third nut.

[0032] Furthermore, the outer surfaces of the cage bottom net, the side net, the central bracket, the camera bracket and the bait rod are coated with anti-rust paint.

[0033] The beneficial effects of the utility model are as follows:

[0034] 1. After being folded, the foldable crab cage provided by the utility model only takes up 22% of the volume of the bucket-shaped crab cage, which greatly reduces the space occupied by the crab cage.

[0035] 2. The first metal frame of the cage bottom net 1 is made of threaded steel bars, which increases the weight of the cage bottom net 1, so that the foldable crab cage can be used for fishing in offshore areas with waves below 2 feet, reducing the impact of waves and rapids on crab fishing in the crab cage.

[0036] 3. The third nut 15 in the center of the center bracket 5 can be connected to the bait rod 24 or the camera bracket 20. The former can increase the bait delivery points, and the latter can observe the abundance of crabs in the water and the situation of crabs entering the cage in real time, thereby increasing the efficiency of crab fishing.

[0037] 4. When not in use, fold the four trapezoidal side nets 2 connected to the cage bottom net 1 in pairs, remove and close the central bracket 5 to form a flat rectangular parallelepiped, which is small in size and easy to carry. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 This is a schematic diagram of a foldable crab cage according to a specific embodiment of the present invention (the side net 2 is laid flat, and the cage bottom net 1 and the side net 2 form a planar structure);

[0039] Figure 2 This is a schematic diagram of a foldable crab cage according to a specific embodiment of the present invention (the side net 2 is in a folded state, and the cage bottom net 1 and the side net 2 form a cage-like structure with an open top);

[0040] Figure 3 It is a schematic diagram of the cage bottom net 1 described in a specific embodiment of the present utility model;

[0041] Figure 4 It is a schematic diagram of the connection method between the first metal frame and the first metal mesh on the cage bottom mesh 1 described in the specific embodiment of the present invention (folded winding method);

[0042] Figure 5 It is a schematic diagram of the side net 2 described in the specific embodiment of the present utility model;

[0043] Figure 6 It is a schematic diagram of the connection method between the second metal frame and the second metal mesh on the side net 2 described in the specific embodiment of the present utility model (folded winding method);

[0044] Figure 7 This is the connection method between the side net 2 and the cage bottom net 1 described in the specific embodiment of the present utility model (the first method, the first metal net of the cage bottom net 1 of the connecting ring 11 is wound and connected);

[0045] Figure 8 This is the connection method between the side net 2 and the cage bottom net 1 described in the specific embodiment of the utility model (the second method, the connecting ring 11 is wound and connected through the anchor point 12 set on the edge of the cage bottom net 1);

[0046] Figure 9 Schematic diagram of the first bracket 8 and the second bracket 9 in the central bracket 5 described in the specific embodiment of the present utility model (the first bracket 8 and the second bracket 9 are not connected);

[0047] Figure 10 Schematic diagram of the first bracket 8 and the second bracket 9 in the central bracket 5 described in a specific embodiment of the present invention (the first bracket 8 and the second bracket 9 are connected by the second bolt 13, the second nut 14 and the second fixing ring 16, and have not yet been unfolded to form a cross shape);

[0048] Figure 11 Schematic diagram of the first bracket 8 and the second bracket 9 in the central bracket 5 described in a specific embodiment of the present invention (the first bracket 8 and the second bracket 9 are connected by the second bolt 13, the second nut 14 and the second fixing ring 16, and are unfolded into a cross shape, and the first fixing ring 10 has not yet been connected to the first bolt 6 on the cage bottom net 1);

[0049] Figure 12It is a partial schematic diagram of the central position of the first bracket 8 and the second bracket 9 described in a specific embodiment of the present utility model (including the second bolt 13, the second nut 14, the third nut 15 and the second fixing ring 16);

[0050] Figure 13 This is a schematic diagram of the connection between the fourth fixing ring of the lifting rope 3 and the third fixing ring of the connecting rope 4 (hitch connection 17) in a specific embodiment of the present invention.

[0051] Figure 14 This is a schematic diagram of the connection between the fourth fixing ring of the lifting rope 3 and the third fixing ring of the connecting rope 4 described in the specific embodiment of the utility model (quick chain connection 18)

[0052] Figure 15 This is a schematic diagram of the connection between the fourth fixing ring of the lifting rope 3 and the third fixing ring of the connecting rope 4 described in the specific embodiment of the utility model (spring hook connection 19)

[0053] Figure 16 It is a schematic diagram of the camera bracket 20 described in a specific embodiment of the present utility model;

[0054] Figure 17 It is a schematic diagram of the camera bracket 20 described in a specific embodiment of the present utility model (with an adjustable worm gear hose clamp 23 installed);

[0055] Figure 18 It is a schematic diagram of the bait rod 24 described in a specific embodiment of the present utility model;

[0056] Figure 19 It is a schematic diagram of the bait rod 24 described in a specific embodiment of the present invention (with a bait cage 27 installed);

[0057] In the figure: 1-cage bottom net, 2-side net, 3-lifting rope, 4-connecting rope, 5-center bracket, 6-first bolt, 7-first nut, 8-first bracket, 9-second bracket, 10-first fixing ring, 11-connecting ring, 12-anchor point, 13-second bolt, 14-second nut, 15-third nut, 16-second fixing ring, 17-hitch connection, 18-quick chain connection, 19-spring hook connection, 20-camera bracket, 21-third bolt, 22-limit block, 23-adjustable worm gear hose clamp, 24-bait rod, 25-fourth bolt, 26-clamp, 27-bait cage. DETAILED DESCRIPTION

[0058] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0059] A folding crab cage (see Figure 1 、2 ), comprising a cage bottom net 1 and a plurality of side nets 2 movably connected to the cage bottom net 1, a central bracket 5 arranged on the cage bottom net 1, and a lifting rope 3 connected to the side nets 2 through a connecting rope 4; when the lifting rope 3 is not under force (a vertical upward pulling force), the side nets 2 and the cage bottom net 1 form a flat plane structure (see Figure 2 ); When the lifting rope 3 is lifted upward, the side net 2 and the cage bottom net 1 together form a bucket-shaped cage structure with an open top (closed in other directions) under the restriction of the central support 5 (see Figure 1 ).

[0060] Cage bottom net 1 (see Figure 3 ) consists of a square first metal frame and a first metal mesh arranged on the first metal frame;

[0061] To increase the weight of the crab cage's bottom, the first metal frame is made of 9.93mm diameter rebar. The sides of the first metal frame are 22.86cm long, and the two ends of the rebar are welded together. The rebar adds weight to the cage bottom, making the foldable crab cage resistant to waves and rapids.

[0062] A first bolt 6 is provided (electrically welded) on each side of the first metal frame. The first bolt 6 is located in the plane formed by the first metal frame and is perpendicular to the side of the first metal frame. Each first bolt 6 is equipped with a first nut 7. The first bolt 6 and the first nut 7 are used to position the center bracket 5. The first bolt 6 is an M6 bolt with a length of 1.5 cm, and the first nut 7 is an M6 butterfly nut.

[0063] The first metal mesh is arranged on the first metal frame by electric welding or mesh winding (see Figure 4 ); the first metal mesh is a No. 16 galvanized welded wire mesh with a mesh length of 5 cm and a width of 2.5 cm, which is connected to the first metal frame to form the bottom of the foldable crab cage.

[0064] There are 4 side nets 2, which correspond to the 4 sides of the cage bottom net 1 one by one; side nets 2 (see Figure 5 ) is composed of a second metal frame of isosceles trapezoidal shape and a second metal mesh arranged on the second metal frame; the second metal frame is made of steel wire with a diameter of 3.97 mm, the upper base is larger than the lower base, the upper base is 33.02 cm wide, the lower base is 22.86 cm wide, and the height is 20.96 cm; the two steel wire ends of each second metal frame are connected by electric welding, the upper angle of the second metal frame (isosceles trapezoidal frame) is 77.2 degrees, and the base angle is 102.8 degrees; the second metal mesh is arranged on the second metal frame by electric welding or by winding the mesh wire back and forth (see Figure 6 ), the second metal mesh is a 20-gauge galvanized steel mesh with a mesh size of 2.54 cm, forming the trapezoidal side of the folding crab pot.

[0065] The lower bottom of the side net 2 is connected to the edge of the cage bottom net 1 through two connecting rings 11 made of metal wire. The side net 2 can rotate around the edge of the cage bottom net 1 through the connecting ring 11, and the four side nets 2 can be folded in half. The connecting ring 11 is oval and made of 16-gauge galvanized steel wire, with a major axis of 2.8 cm and a minor axis of 2 cm.

[0066] The connecting ring 11 is fixed to the edge of the cage bottom net 1 in three ways:

[0067] The first (see Figure 7 ), the metal wire of the connecting ring 11 is wound and connected with the first metal mesh of the cage bottom mesh 1;

[0068] The second (see Figure 8 ), set (electrically welded) two anchor points 12 (the anchor points 12 are rectangular parallelepipeds with a length of 1 cm, a width of 0.5 cm, and a thickness of 3 mm) on the inner side of the edge of the cage bottom net 1, and drill two fixing holes on each anchor point 12 with a drill bit with a diameter of 1.6 mm. The metal wire of the connecting ring 11 is wound and connected to the edge of the cage bottom net 1 through the fixing holes;

[0069] The third method is to directly weld and fix the connecting ring 11 to the inner side of the first metal frame.

[0070] The central support 5 includes a first support 8 and a second support 9 (see Figure 9 、 10 , 11, 12);

[0071] The first bracket 8 and the second bracket 9 are each made of two inverted L-shaped metal rods, each of which includes a first bent section and a second bent section. The first bent sections of the two inverted L-shaped metal rods are butted together to form a straight crossbeam; the two second bent sections form support rods at both ends of the crossbeam, and the support rods and the crossbeam form an isosceles trapezoid with an open lower base, wherein the upper base of the isosceles trapezoid is larger than the lower base.

[0072] A first fixing ring 10 is provided at the bottom end of the support rod (the end not connected to the first bending section). The axis of the center of the first fixing ring 10 is parallel to the crossbeam. The first fixing ring 10 matches the first bolt 6. The first bracket 8 and the second bracket 9 are provided with a total of four first fixing rings 10, which correspond one-to-one to the four first bolts 6 on the cage bottom net 1.

[0073] A third nut 15 is also provided at the center of the crossbeam of the first bracket 8. The ends of the first bent sections of the two inverted L-shaped metal rods forming the first bracket 8 are welded to the outer surface of the third nut 15, connecting them together via the third nut 15 to form the crossbeam. The axis of the third nut 15 is perpendicular to the crossbeam and parallel to the plane of the isosceles trapezoid formed by the first bracket 8.

[0074] A second bolt 13 is provided at the center of the crossbeam of the first bracket 8. The second bolt 13 is located in the plane of the isosceles trapezoid of the first bracket 8, perpendicular to the crossbeam, and the bottom end is welded to the upper surface of the third nut 15. The second bolt 13 is equipped with a matching second nut 14. The third nut 15 is located below the bottom end of the second bolt 13, and the third nut 15 is coaxially aligned with the second bolt 13 (see FIG. Figure 12 ), the threaded opening on the lower surface of the third nut 15 is used to connect accessories;

[0075] A second fixing ring 16 (see Figure 12 ), the ends of the first bent sections of the two inverted L-shaped metal rods constituting the second bracket 9 are welded to the outer surface of the second fixing ring 16, and are connected together through the second fixing ring 16 to form a cross beam; the axis of the second fixing ring 16 is perpendicular to the cross beam and parallel to the plane of the isosceles trapezoid formed by the second bracket 9; the second fixing ring 16 matches the second bolt 13 of the first bracket 8, and the first bracket 8 and the second bracket 9 are connected together through the second fixing ring 16, the second bolt 13 and the second nut 14, and then the first fixing ring 10 at the bottom end of the support rod of the first bracket 8 and the second bracket 9 is connected to the first bolt 6 and the first nut 7 on the edge of the cage bottom net 1, so that the first bracket 8 and the second bracket 9 are connected to form a mutually perpendicular cross-shaped central bracket 5, and the four support rods on the first bracket 8 and the second bracket 9 correspond to a side net 2 respectively, and are restricted to the outside of the central bracket 5 when the side net 2 is lifted up and flipped over by the lifting rope 3, thereby forming a cage-like structure with an open top together with the cage bottom net 1. Production of the center bracket 5: Use a steel wire with a diameter of 3.97 mm to make four inverted L-shaped pieces with an angle of 77.2 degrees. The upper section is 18.4 cm long and the lower section is 32.07 cm long. Bend the end of the lower section into a ring with a diameter of 7 mm as the first fixing ring 10. The plane of the ring is perpendicular to the upper steel wire. When making the first bracket 8, weld the two upper sections of the inverted L-shaped pieces and the M6 ​​nuts (third nuts 15) with a diameter of 1.5 cm to form a bottomless trapezoidal frame. Then, fix a 1.5 cm long M6 bolt (second The second bracket 9 is constructed by welding the other two inverted L-shaped upper sections to another M6 nut (i.e., the second fixing ring 16) with a 1.5-cm diameter thread removed, forming another bottomless trapezoidal frame. The first bracket 8 and the second bracket 9 are connected by bolts (the second bolts 13) attached to the M6 ​​nuts of the first bracket 8. These are then secured with an M6 butterfly nut (the second nut 14), forming a foldable and expandable cross-shaped center bracket 5. The center bracket 5 not only ensures that the cage bottom net 1 and its four connected trapezoidal side nets 2 form a cage-like structure when raised and a flat surface when released, but also enables the third nut 15 in the center of the center bracket 5 to connect to accessories such as the bait rod 24 or the camera bracket 20.

[0076] A connecting rope 4 is set on each side net 2. The specifications of each connecting rope 4 are consistent. The bottom end of the connecting rope 4 is connected to the central position of the upper bottom of the isosceles trapezoidal side net 2; the top ends of all connecting ropes 4 are connected to the tail ends of the lifting ropes 3; the connecting ropes 4 are nylon twisted ropes with a tensile strength of 45.36 kg and a total length of 48 cm. The lifting ropes 3 are made of nylon blended ropes with a diameter of 3.2 mm and a length of 7.6 meters.

[0077] The top of all the connecting ropes 4 is provided with a third fixing ring (with a diameter of 5 cm), and the tail end of the lifting rope 3 is provided with a fourth fixing ring (with a diameter of 7 cm). The top of the connecting rope 4 and the tail end of the lifting rope 3 are connected by the fourth fixing ring and the third fixing ring; the fourth fixing ring and the third fixing ring are connected by a knot connection (see Figure 13 ), Spring hook connection (see Figure 15 ) or quick link connection (see Figure 14 ).

[0078] Also includes a camera bracket 20 (see Figure 16 ), the camera bracket 20 is composed of two parallel metal wires, and a third bolt 21 is fixedly connected and provided at the top ends of the two metal wires. The third bolt 21 is parallel to the two metal wires, and the bottom end is fixedly connected to the top ends of the two metal wires (welded connection). The third bolt 21 matches the third nut 15. The camera bracket 20 can be set on the central bracket 5 through the third bolt 21 and the third nut 15; two limit blocks 22 are also provided on each metal wire. The limit blocks 22 are used to cooperate with the adjustable worm gear hose clamp 23 to fix the camera on the camera bracket 20 (see Figure 17 The camera bracket 20 is made of two 3.97 mm diameter steel wires, forming two right-angled inverted L-shaped sections. The upper section is 1 cm long and the lower section is 6 cm long. The ends of the two upper sections are welded together with a 1 cm long M6 bolt (third bolt 21), so that the spacing between the two lower sections is 8.5 mm (the spacing between the two wires). Four limit blocks 22 (3.97 mm diameter, 3.97 mm length) are welded together at 1.5 cm and 3.5 cm on the back side of the lower section to prevent the adjustable worm gear hose clamp 23 that secures the camera from falling off. By selecting adjustable worm gear hose clamps 23 of different sizes, it can be connected to cameras of different sizes.

[0079] Also includes a bait rod 24 (see Figure 18 ), the bait rod 24 is used to hang the bait cage 27; the bait rod 24 is a metal rod, the bait rod 24 is evenly provided with a number of perforations along the axial direction, the perforations are provided with a fixture 26, the bait cage 27 is hung on the bait rod 24 by the fixture 26 (see Figure 19); A fourth bolt 25 is provided at the top of bait rod 24. The fourth bolt 25 is coaxial with bait rod 24 and mates with third nut 15. The fourth bolt 25 and third nut 15 enable bait rod 24 to be mounted on center bracket 5. Bait rod 24 is a 25-centimeter-long steel wire with a diameter of 3.97 mm. It is heated and flattened every 2.54 cm and then drilled (perforated) with a 1.6 mm drill bit at 2.54 cm intervals for connection to bait cage 27. A 1-centimeter-long M6 bolt (fourth bolt 25) is welded to one end of the wire. This M6 bolt (fourth bolt 25) connects bait rod 24 to the M6 ​​nut (third nut 15) in the center of center bracket 5.

[0080] The outer surfaces of the cage bottom net 1, the side nets 2, the central bracket 5, the camera bracket 20 and the bait rod 24 (the steel surface of the entire foldable crab cage and accessories) are coated with anti-rust paint.

[0081] Practical application of the foldable crab cage provided by the utility model:

[0082] Folding crab cage assembly: First, unfold the trapezoidal side nets 2 folded in two by two, that is, the shape of the folded crab cage after sinking into the water (see Figure 1 ), the total area is 64.77cm×64.77cm=4195.15cm 2 , open the cross-shaped center support 5, insert the four first fixing rings 10 at the end of the center support 5 into the four first bolts 6 of the cage bottom net 1, and then tighten the four first nuts 7 to secure it. Then, connect the connecting ropes 4 of the four trapezoidal side nets 2 to the lifting rope 3 through the knot connection 17 or the quick chain connection 18 or the spring hook connection 19 to complete the assembly of the foldable crab cage. Lifting the lifting rope 3 will form a bucket-shaped crab cage. The volume of the bucket-shaped crab cage is (22.86cm 2 +38.74cm 2 +38.72cm×22.86cm)×30.48cm / 3=29555.07cm 3 , and the volume of the crab cage when folded is 33.02cm×38.74cm×5.08cm=6498.31cm 3 Therefore, the volume of the crab pot when folded is only 22% of the volume of the crab pot when it is in a bucket shape when lifted up, that is, one-fourth and one-fifth.

[0083] Installation of bait: The bait is usually tied to the upper surface of the cage bottom net 1, and the bait can also be set through the bait rod 24 as an additional delivery point. At this time, the fourth bolt 25 on the bait rod 24 is connected to the threaded mouth on the lower surface of the third nut 15 of the center bracket 5, and the bait cage 27 can be connected to the bait rod 24 and hung at different positions of the bait rod 24.

[0084] Installation of the underwater camera: Connect the third bolt 21 on the camera bracket 20 to the threaded opening on the lower surface of the third nut 15 of the center bracket 5, and select a suitable adjustable worm gear hose clamp 23 to fix the camera according to the size of the camera.

[0085] After the folded crab cage enters the water and touches the bottom, the lifting rope 3 loses its tension, and each side net 2 unfolds into a surface (such as Figure 1 as shown), making it easy for crabs to approach the bait.

[0086] To refold the foldable crab cage: After fishing, remove the bait, untie the knot connection 17 or other connections, unscrew the four first nuts 7, remove and close the cross-shaped center support 5, and fold the four trapezoidal side nets 2 in half, forming the foldable crab cage. The total weight of the foldable crab cage is 1.72 kg.

[0087] The device described in the present invention is not limited to the embodiments described in the specific implementation manner. Those skilled in the art may derive other implementation manners based on the technical solution of the present invention, which also fall within the scope of technical innovation of the present invention.

Claims

1. A foldable crab cage, characterized by: The invention comprises a cage bottom net (1) and a plurality of side nets (2) movably connected to the cage bottom net (1), a central support (5) arranged on the cage bottom net (1), and a lifting rope (3) connected to the side nets (2) via a connecting rope (4); when the lifting rope (3) is not subjected to force, the side nets (2) and the cage bottom net (1) form a flat planar structure; when the lifting rope (3) is lifted upward, the side nets (2) and the cage bottom net (1) form a cage-like structure with an open top together under the restriction of the central support (5).

2. A foldable crab cage according to claim 1, characterized in that: The cage bottom net (1) is composed of a square first metal frame and a first metal net arranged on the first metal frame; The first metal frame is made of threaded steel bars; A first bolt (6) is provided on each side of the first metal frame, the first bolt (6) is located in the plane formed by the first metal frame and is perpendicular to the side of the first metal frame, each first bolt (6) is matched with a first nut (7), and the first bolt (6) and the first nut (7) are used to position the central bracket (5); The first metal mesh is arranged on the first metal frame by electric welding or mesh wire folding and winding.

3. A foldable crab cage as claimed in claim 2, characterized in that: There are four side nets (2), which correspond one to one with the four sides of the cage bottom net (1); the side nets (2) are composed of an isosceles trapezoidal second metal frame and a second metal net arranged on the second metal frame; the second metal frame is made of steel wire, and the upper base is larger than the lower base; the second metal net is arranged on the second metal frame by electric welding or by folding and winding the mesh wire.

4. A foldable crab cage as claimed in claim 3, characterized in that: The lower bottom of the side net (2) is connected to the edge of the cage bottom net (1) through two connecting rings (11) composed of metal wires. The side net (2) can rotate with the edge of the cage bottom net (1) as an axis through the connecting ring (11). The four side nets (2) can be folded in two; the connecting ring (11) is elliptical. The connecting ring (11) is fixed to the edge of the cage bottom net (1) in three ways: The first type is that the metal wire of the connecting ring (11) is wound and connected with the first metal mesh of the cage bottom mesh (1); The second method is to provide two anchor points (12) on the inner side of the edge of the cage bottom net (1), drill two fixing holes on each of the anchor points (12), and the metal wire of the connecting ring (11) is wound and connected to the edge of the cage bottom net (1) through the fixing holes; The third method is to directly weld and fix the connecting ring (11) to the inner side of the first metal frame.

5. A foldable crab cage as claimed in claim 3, characterized in that: The central support (5) comprises a first support (8) and a second support (9); The first bracket (8) and the second bracket (9) are both made of two inverted L-shaped metal rods, the inverted L-shaped metal rods including a first bending section and a second bending section, the first bending sections of the two inverted L-shaped metal rods are butted together to form a straight crossbeam; the two second bending sections constitute support rods located at both ends of the crossbeam, the support rods and the crossbeam form an isosceles trapezoid with an open bottom structure, and the upper base of the isosceles trapezoid is larger than the lower base; A first fixing ring (10) is provided at the bottom end of the support rod, the axis of the center of the first fixing ring (10) is parallel to the crossbeam, and the first fixing ring (10) matches the first bolt (6); the first bracket (8) and the second bracket (9) are provided with a total of four first fixing rings (10), which correspond one to one with the four first bolts (6) on the cage bottom net (1); A third nut (15) is further provided at the central position of the crossbeam of the first bracket (8); the ends of the first bent sections of the two inverted L-shaped metal rods constituting the first bracket (8) are welded to the outer surface of the third nut (15), and are connected together by the third nut (15) to form the crossbeam; the axis of the third nut (15) is perpendicular to the crossbeam and parallel to the plane of the isosceles trapezoid formed by the first bracket (8); A second bolt (13) is provided at the central position of the crossbeam of the first bracket (8), the second bolt (13) is located in the plane of the isosceles trapezoid of the first bracket (8), is perpendicular to the crossbeam, and the bottom end is welded to the upper surface of the third nut (15); the second bolt (13) is equipped with a matching second nut (14); the third nut (15) is located below the bottom end of the second bolt (13), the third nut (15) is coaxially aligned with the second bolt (13), and the threaded opening on the bottom surface of the third nut (15) is used to connect accessories; A second fixing ring (16) is provided at the central position of the crossbeam of the second bracket (9), and the ends of the first bent sections of the two inverted L-shaped metal rods constituting the second bracket (9) are welded to the outer surface of the second fixing ring (16), and are connected together through the second fixing ring (16) to form the crossbeam; the axis of the second fixing ring (16) is perpendicular to the crossbeam and parallel to the plane where the isosceles trapezoid formed by the second bracket (9) is located; the second fixing ring (16) matches the second bolt (13) of the first bracket (8), and the first bracket (8) is fixed by the second fixing ring (16), the second bolt (13) and the second nut (14). and the second bracket (9), and then the first fixing ring (10) at the bottom end of the support rod of the first bracket (8) and the second bracket (9) is connected to the first bolt (6) and the first nut (7) on the edge of the cage bottom net (1), so that the first bracket (8) and the second bracket (9) are connected to form a mutually perpendicular cross-shaped central bracket (5), and the four support rods on the first bracket (8) and the second bracket (9) respectively correspond to one of the side nets (2), and when the side nets (2) are lifted up and turned over by the lifting rope (3), they are restricted to the outside of the central bracket (5), thereby forming a cage-like structure with an open top together with the cage bottom net (1).

6. A foldable crab cage as claimed in claim 5, characterized in that: A connecting rope (4) is provided on each side net (2), and the specifications of each connecting rope (4) are consistent. The bottom end of the connecting rope (4) is connected to the center position of the upper bottom of the isosceles trapezoidal side net (2); the top ends of all the connecting ropes (4) are connected to the tail ends of the lifting ropes (3).

7. A foldable crab cage as claimed in claim 6, characterized in that: The top end of all the connecting ropes (4) is provided with a third fixing ring, and the tail end of the lifting rope (3) is provided with a fourth fixing ring, and the top end of the connecting rope (4) and the tail end of the lifting rope (3) are connected by the fourth fixing ring and the third fixing ring; the connection method of the fourth fixing ring and the third fixing ring is a knot connection, a spring hook connection or a quick chain connection.

8. A foldable crab cage according to claim 7, characterized in that: The invention also includes a camera bracket (20), wherein the camera bracket (20) is composed of two parallel metal wires, and a third bolt (21) is fixedly connected and arranged at the top ends of the two metal wires. The third bolt (21) is parallel to the two metal wires, and the bottom end is fixedly connected to the top ends of the two metal wires. The third bolt (21) matches the third nut (15). The camera bracket (20) can be set on the central bracket (5) through the third bolt (21) and the third nut (15); two limit blocks (22) are also arranged on each of the metal wires, and the limit blocks (22) are used to cooperate with the adjustable worm gear hose clamp (23) to fix the camera on the camera bracket (20).

9. A foldable crab cage as claimed in claim 8, characterized in that: It also includes a bait rod (24), which is used to hang a bait cage (27); the bait rod (24) is a metal rod, and a plurality of through holes are evenly arranged on the bait rod (24) along the axial direction, and a clamp (26) is set through the through holes, and the bait cage (27) is hung on the bait rod (24) through the clamp (26); a fourth bolt (25) is provided at the top end of the bait rod (24), and the fourth bolt (25) is coaxial with the bait rod (24), and the fourth bolt (25) matches the third nut (15), and the bait rod (24) can be set on the central bracket (5) through the fourth bolt (25) and the third nut (15).

10. A foldable crab cage according to claim 9, characterized in that: The outer surfaces of the cage bottom net (1), the side net (2), the central bracket (5), the camera bracket (20) and the bait rod (24) are coated with anti-rust paint.

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