CN210299120U

CN210299120U - Crab fishing device without hook

Info

Publication number: CN210299120U
Application number: CN201921021919.3U
Authority: CN
Inventors: 翟凤平
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-07-03
Filing date: 2019-07-03
Publication date: 2020-04-14
Anticipated expiration: 2029-07-03

Abstract

The utility model aims at providing a no hook is thrown and is angled crab device. The no-hook throwing crab fishing device consists of an anti-hanging shell device and a food attracting cage device, wherein a purse net sleeve of the food attracting cage device is arranged on the surface of a food cage, a buoyancy cover is connected with the food cage to form the food attracting cage device, the food attracting cage device is arranged in the anti-hanging shell device through a food cage guide rod and a food cage guide rod hole, when the device is thrown into water by a fisher, the device is sunk to the water bottom due to the fact that the underwater weight of the anti-hanging shell device is larger than the buoyancy of the buoyancy cover, the buoyancy cover pulls the attraction food cage device filled with the attraction crab food to float at the set height at the bottom due to the fact that the buoyancy of the buoyancy cover is larger than the underwater weight of the attraction food cage device, the crab is attracted by food taste, the crab clamp saw teeth and bone joints are hooked in the purse net sleeve, and when the crab is trapped to break loose, trapped information of the crab is transmitted to the fishing rod through the main line.

Description

Crab fishing device without hook

Technical Field

The utility model relates to a fishing technical field, in particular to a fishhook-free casting crab fishing device using a fishing rod for casting.

Background

At present, no equipment for catching crabs by using a fishing rod casting method exists, only a net and a crab pot are used for catching crabs, and the main defect of catching crabs by using the net and the crab pot is that the net and the crab pot cannot replace the pleasure and the motion effect brought to a fisherman by fishing crabs in a fishing rod casting mode.

Disclosure of Invention

The utility model aims at providing a no hook is thrown and is angled crab device.

The utility model is realized in such a way, which is characterized in that the device for fishing crabs without hook throwing is composed of an anti-hanging shell device and a device for attracting food cages, the food cage guide rod of the device for attracting food cages is connected with the guide rod connecting point of the food cages through the bottom fixed point of the food cages, the purse net sleeve is covered on the surface of the food cages through the purse net sleeve hanging hook, the food for attracting crabs is arranged in the food cages, the buoyancy cover is folded through the food cage opening and the cage opening hook is closed to form the device for attracting food cages, the device for attracting food cages is arranged on the mainline of the end point of the food cage guide rod, the inner side of the anti-hanging shell device passes through the hole of the food cage guide rod, so that the food cages are arranged in the anti-hanging shell device through the food cage inlet to form the device for fishing crabs, when the fishhook-free throwing crab fishing device is thrown into water by a fisher, the buoyancy cover pulls the food cage to float out from the food cage inlet of the anti-hanging shell device until the main line sets the distance of the spacing space bean.

The anti-hanging shell device consists of a shell, a food cage guide rod hole and a food cage inlet, wherein the shell is a cylindrical metal body which is made of metal with specific gravity larger than that of water and is provided with one closed end, the inner diameter and the length of the metal body are larger than the outer diameter and the length of the food cage guiding rod hole, the weight of the shell under water is set to be larger than the buoyancy of the buoyancy cover, the anti-hanging shell device has the functions of sinking and stabilizing the whole fish-throwing device under water by utilizing the larger weight of the shell after the fish-throwing device is thrown into the water, in addition, when a fisher receives lines, the food cage guiding rod is guided into the shell by the food cage guide rod hole through the food cage guide rod hole, so that the fish-throwing device is prevented from being hooked by an underwater obstacle, the food cage guide rod hole is a round hole which is arranged at the center of the closed end of the bottom of the shell, the inner diameter of the food cage guide rod hole is set to be larger than the diameter of, the food cage guide rod is limited by the hole wall of the food cage guide rod hole, so that a food cage at the rear end of the food cage guide rod and a purse net sleeve covering the periphery of the food cage guide rod can smoothly enter the food cage inlet.

The food inducing cage device consists of a food cage guide rod, a food cage, a net enclosing sleeve, a buoyancy cover, a main line, a limiting space bean and food for inducing crabs, wherein the food cage guide rod consists of a guide rod, a main line connecting point and a food cage bottom fixing point, the guide rod is a straight cylinder made of hard metal, the diameter of the straight cylinder is smaller than the inner diameter of a hole of the food cage guide rod, the length of the straight cylinder is larger than the length of the anti-hanging shell device, the main line connecting point is a hole which is arranged at one end of the guide rod and connected with the main line, the food cage bottom fixing point is a point which is arranged at the other end of the guide rod and connected with the guide rod connecting point of the food cage, the food cage consists of a cage body, a guide rod connecting point, a food cage opening folding connecting point, a buoyancy cover hanging hole and a net enclosing sleeve hanging hook, the cage body is a net-shaped metal cage which is made of metal wires and has a bottom without a cover, the net shape and can lead the food for inducing the crabs to, the food cage mouth hinge joint is a joint point arranged at the edge of the cage mouth of the cage body and connected with the food cage mouth hinge, the buoyancy cover hanging hole is a hole arranged at the corresponding point of the joint point of the edge of the cage mouth of the cage body and the food cage mouth hinge, the function of the buoyancy cover hanging hole is to enable a cage mouth hook to be hooked in the hole, the buoyancy cover is covered on the food cage mouth to enable food for luring crabs to be fixed in the food cage, a purse net sleeve hook is a hook arranged at the outer side of the cage body and used for fixing a purse net sleeve, the purse net sleeve covers the surface of the cage body, the purse net sleeve is a net sleeve made of nylon wires with the wire diameter of less than 0.5 millimeter, the mesh size of the net sleeve is determined according to the type and size of target crabs, the buoyancy cover is composed of a plastic floater, the food cage mouth hinge and the cage mouth hook, the plastic floater is made of sealed air in the plastic, the shape and the size of the floater are the shape and the size of the cage mouth of the cage body, and the buoyancy of the, the weight of the food cage is larger than the underwater weight of the sum of the food cage and the food of the induced crab, the function is that after a fisher throws the fishhook-free device into the water, the underwater weight of the anti-hanging shell device is larger than the buoyancy of the plastic floater, the fishhook-free device sinks into the water bottom, and the buoyancy of the plastic floater is larger than the underwater weight of the sum of the food cage and the food of the induced crab, so that the buoyancy cover pulls the food cage containing the food of the induced crab, the food cage floats out from the food cage inlet of the anti-hanging shell device to the distance of the mainline provided with the spacing space bean, the food cage containing the food of the induced crab is pulled by the buoyancy of the buoyancy cover to form a floating posture under the water, the hinge of the food cage opening is a hinge arranged at the edge of the plastic floater, the function is to connect the buoyancy cover with the cage opening of the food cage, namely, the buoyancy cover can be used as the cover of the food cage, and can play a role of connecting, the cage mouth hook is a hook arranged at the edge of the plastic floater and at the end corresponding to the food cage mouth hinge, and has the function that after food for attracting crabs is put into a food cage, the cage mouth hook is hooked in the buoyancy cover hanging hole, so that the buoyancy cover is used as a cover of the food cage, the aim that the food for attracting crabs can only release taste and cannot be eaten by the attracted crabs is achieved, the main line is a fishing line of which a fishing rod is connected with the hookless throwing fishing device, the limit space bean is a space bean which is arranged on the main line and has the outer diameter larger than the inner diameter of a food cage guide rod hole, a fisher sets a limit device for attracting the height of the food cage device from the underwater according to the type and the feeding habit of target crabs, namely a limit device for limiting the floating distance of the buoyancy cover to move the attracting food cage device, and has the function that after the hookless throwing fishing device is put into the water by the fisher, because the weight of the anti-floating shell device is larger than the buoyancy cover in the attracting food cage device, the fishhook-free throwing device can sink the fishing device Under the water, the buoyancy of the buoyancy cover is larger than the weight of the attracting food cage device in water, so that the buoyancy cover pulls the attracting food cage device to float upwards, when the limiting space beans are arranged on the main line outside the food cage guide rod hole of the anti-hanging shell device, the limiting space beans are blocked at the hole opening of the food cage guide rod, the floating height of the attracting food cage device under water is kept at the height limited by a fisherman according to the type and foraging habit of target crabs, the food for attracting crabs is bait arranged according to the food which is loved by the target crabs to be fished, and the outer diameter of the bait is smaller than the inner diameter of the cage opening of the food cage.

The assembly method of the no-hook throwing crab fishing device comprises the steps of connecting a food cage guide rod with a food cage through a food cage bottom fixing point, connecting a buoyancy cover with a food cage opening through a food cage opening folding paper and a food cage opening folding connecting point with a cage opening of the food cage, arranging a purse net sleeve on the surface of a cage body of the food cage through a purse net sleeve hook, penetrating one end of a main line into a limiting space bean, penetrating a food cage guide rod hole from the outer side of the bottom of a shell of the anti-hanging shell device after a limiting distance is set according to the type of a target crab, connecting an end point of the main line with a main line connecting point of the food cage guide rod, putting prepared food for luring crabs into the food cage, and then hooking the cage opening hook into the buoyancy cover hanging hole.

The working principle of catching crabs by the hookless casting crab fishing device is that after the device is thrown into water by a fisher, because the underwater weight of the anti-hanging shell device is larger than the buoyancy of the plastic floater, the device is sunk into the water bottom, and because the buoyancy of the plastic floater is larger than the underwater weight of the sum of the food cage and the food for attracting crabs, the buoyancy cover pulls the food cage filled with the food for attracting crabs to float out of the food cage inlet of the anti-hanging shell device until the distance between the main line and the limit space bean arranged on the main line is reached, namely the food cage is pulled by the buoyancy cover until the limit space bean arranged on the main line is blocked at the guide rod hole of the food cage, so that the food cage filled with the food for attracting crabs is pulled by the buoyancy cover to form a high floating posture set at the water bottom, the food flavor is used for attracting crabs to catch food, and the sawtooth and bone joints of the crab pincers are hooked in the purse net sleeve arranged at the periphery of the food cage to be unable to break off, when the crabs are trapped on the purse net sleeve to break loose, the trapped information is transmitted to the fishing rod through the main line, and in addition, when the food for attracting the crabs needs to be taken up, the main line pulls the food cage guide rod, so that the food cage guide rod penetrates through the food cage guide rod hole, the food cage behind the food cage guide rod and the purse net sleeve covering the food cage guide rod smoothly enter the anti-hanging shell device through the food cage inlet, and the purse net sleeve of the fishing crab device without hooks is prevented from being hung by underwater sundries in the taking-up process.

Drawings

The invention is further described below with reference to the accompanying drawings:

fig. 1 is a schematic structural view of a hookless cast crab fishing device.

Fig. 2 is a schematic structural view of the anti-hang shell device in fig. 1.

Fig. 3 is a schematic view of the structure of a food cage guide bar in the food cage attracting device of fig. 1.

Fig. 4 is a schematic view of the structure of a food cage in the food cage attracting device of fig. 1.

Fig. 5 is a schematic structural view of a seine cover in the food induction cage device of fig. 1.

Fig. 6 is a schematic view of the construction of the buoyant cover in the attractant food cage apparatus of fig. 1.

Fig. 7 is a schematic structural view of the combination of the food cage guide, the food cage, the seine and the buoyant cover in the apparatus for attracting food in fig. 1.

Fig. 8 is a sectional view schematically showing the structure of the crab fishing device without a hook.

Fig. 9 is a schematic view of the hookless cast crab fishing apparatus inducing the food cage apparatus to float under water.

Detailed Description

As shown in fig. 1, fig. 2, fig. 3, fig. 4, fig. 5, fig. 6, fig. 7, fig. 8, fig. 9, the present invention is realized by that the device for fishing crabs thrown without hook is composed of an anti-hanging shell device 1 and a device for attracting food cages 2, the food cage guide rod 6 of the device for attracting food cages 2 is connected with the guide rod connection point 17 of the food cage 7 through the food cage bottom fixing point 15, the purse net 8 is covered on the surface of the food cage 7 through the purse net hook 20, the food 12 for attracting crabs is arranged in the food cage 7, the buoyancy cover 9 is sealed the food cage 7 through the food cage opening folding sheet 22 and the cage opening hook 23 to form the device for attracting food cages 2, the device for attracting food cages 2 passes through the food cage guide rod hole 4 from the inner side of the anti-hanging shell device 1 through the main line 10 arranged at the end point of the food cage guide rod 6, so that the food cage 7 is arranged in the anti-hanging shell device 1 through the food cage inlet 5 to form the device for fishing crabs thrown without hook, when the fishhook-free casting crab fishing device is cast into water by a fisher, the buoyancy cover 9 pulls the food cage 7 to float out from the food cage inlet 5 of the anti-hanging shell device 1 until the distance of the main line 10 for arranging the spacing space bean 11 is reached.

As shown in fig. 1, 2, 8 and 9, the anti-hang shell device 1 is composed of a shell 3, a food cage guide rod hole 4 and a food cage inlet 5, the shell 3 is a cylindrical metal body which is made of metal with specific gravity larger than water and is closed at one end, the inner diameter and the length of the metal body are larger than the outer diameter and the length of the induced food cage device 2, the weight of the metal body under water is larger than the buoyancy of the buoyancy cover 9, the effect is that after the unhooked cast crab fishing device is cast into water, the weight of the shell 3 is larger to play the roles of sinking and stabilizing the whole unhooked cast crab device under water, in addition, when a fisher takes in line, the induced food cage device 2 is guided into the shell 3 by the food cage guide rod 6 through the food cage guide rod hole 4, so that the induced food cage device 2 is prevented from being hung by an underwater obstacle, the food cage guide rod hole 4 is a round hole which is arranged at the center of the closed end of the bottom of the shell 3, the inner diameter of the food cage, the length of the main line is set to be that when the main line pulls the food cage guide rods 6 into the food cage guide rod holes 4, the food cage guide rods 6 are limited by the hole walls of the food cage guide rod holes 4, the food cage 7 at the rear end of the food cage guide rod 6 and the purse net sleeve 8 covering the periphery of the food cage guide rod can smoothly enter the food cage inlet 5, the function is that the food cage guide rod holes 4 are used for limiting the direction of the food cage guide rod 6 and the food cage 7 which are pulled into the food cage 7, so that the food cage 7 is accurately guided into the food cage inlet 5 according to the food cage guide rod holes 4, namely, when a fisherman receives the line, the front end of the food cage guide rod 6 penetrates into the food cage guide rod hole 4, so that the food cage 7 at the rear end of the food cage guide rod 6 and the purse net sleeve 8 covering the periphery of the food cage guide rod smoothly enter the anti-hanging shell device 1 through the food cage inlet 5, the purse net sleeve 8 at the periphery of the food cage 7 is prevented from being hung on an underwater obstacle in the line receiving process, and the food cage inlet 5 is a port with the caliber larger than the outer diameter of the attracting food cage device 2.

As shown in fig. 1, 2, 3, 4, 5, 6, 7, 8 and 9, the food inducing device 2 comprises a food cage guide rod 6, a food cage 7, a purse net 8, a buoyancy cover 9, a main line 10, a spacing space bean 11 and food 12 for inducing crabs, the food cage guide rod 6 comprises a guide rod 13, a main line connecting point 14 and a food cage bottom fixing point 15, the guide rod 13 is a straight cylinder made of hard metal with the diameter smaller than the inner diameter of the food cage guide rod hole 4 and the length larger than the length of the anti-hanging shell device 1, the main line connecting point 14 is a hole which is arranged at one end of the guide rod 13 and is connected with the main line 10, the food cage bottom fixing point 15 is a point which is arranged at the other end of the guide rod 13 and is connected with a guide rod connecting point 17 of the food cage 7, the food cage 7 comprises a cage body 16, a guide rod connecting point 17, a food cage opening hinge connecting point 18, a buoyancy cover hanging hole 19 and a purse net sleeve hanging hook, the cage body 16 is a net-shaped metal cage which is made of metal wires and has a bottom and no cover, the net-shaped function is to lead the food 12 which is arranged in the cage body 16 and is used for inducing crabs to emit flavor, the guide rod connecting point 17 is a connecting point which is arranged at the center of the cage bottom of the cage body 16 and is connected with the food cage bottom fixing point 15 of the food cage guide rod 6, the food cage opening hinge connecting point 18 is a connecting point which is arranged at the edge of the cage opening of the cage body 16 and is connected with the food cage opening hinge 22, the buoyancy cover hanging hole 19 is a hole which is arranged at the corresponding point of the connecting point 18 between the edge of the cage opening of the cage body 16 and the food cage opening hinge, the function is to lead the cage opening hook 23 to be hung in the hole, the buoyancy cover 9 is covered on the opening of the food cage 7, the food 12 which is used for inducing crabs to be fixed in the food cage 7, the purse net sleeve hanging hook 20 is a hook which is arranged at the outer side of the cage body 16 and is used for fixing the purse sleeve 8, the purse sleeve 8 is made of the purse, the mesh size is determined according to the type and size of the target crab, the buoyancy cover 9 is composed of a plastic floater 21, a food cage opening hinge 22 and a cage opening hook 23, the plastic floater 21 is a floater made of plastic enclosed air, the shape and size of the floater are the same as those of the cage opening of the cage body 16, the buoyancy of the floater is set to be smaller than the underwater weight of the anti-hanging shell device 1 and larger than the underwater weight of the sum of the food cage 7 and the food 12 for luring the crab, the function of the floater is that after a fisher throws the crab-free throwing device into the water, the underwater weight of the anti-hanging shell device 1 is larger than the buoyancy of the plastic floater 21, so that the crab-free throwing device sinks into the water bottom, and the underwater weight of the sum of the food cage 7 and the food 12 for luring the crab is also larger than the buoyancy of the plastic floater 21, so that the buoyancy cover 9 pulls the food cage 7 containing the food 12 for luring the crab, the distance from the food cage inlet 5 of the anti-hanging shell device 1 to the main line 10 is provided with the limit space beans 11, so that the food cage 7 filled with food 12 for attracting crabs is pulled by the buoyancy of the buoyancy cover 9 to form a floating posture under water, the food cage opening hinge 22 is a hinge arranged at the edge of the plastic floater 21 and has the function of connecting the buoyancy cover 9 with the cage opening of the food cage 7, namely, the buoyancy cover 9 is used as the cover of the food cage 7 and also has the function of connecting the buoyancy cover 9 with the food cage 7, the cage opening hook 23 is a hook arranged at the edge of the plastic floater 21 and the corresponding end of the food cage opening hinge 22 and has the function of hooking the cage opening hook 23 in the buoyancy cover hanging hole 19 after the food 12 for attracting crabs is placed in the food cage 7, so that the buoyancy cover 9 is used as the cover of the food cage 7, and the aim of leading the food 12 for attracting crabs to only release the taste and can not be eaten by the attracted crabs is fulfilled, the main line 10 is a fishing line of a fish rod connecting a hookless throwing and fishing crab device, the limit space bean 11 is a space bean which is arranged on the main line and has the outer diameter larger than the inner diameter of a food cage guide rod hole 4, the limit space bean 11 is a limit device which is arranged on the main line and is used for setting the height of the attracting food cage device 2 underwater away from the water bottom according to the variety and the foraging habit of a target crab, namely, the limit device which limits the floating distance of the attracting food cage device 2 driven by the buoyancy cover 9, and has the functions that after the fisher throws the hookless throwing and fishing crab device into the water, the weight of the anti-hanging shell device 1 is larger than the buoyancy of the buoyancy cover 9 in the attracting food cage device 2, so that the buoyancy cover 9 pulls the attracting food cage device 2 to the water bottom, and when the limit space bean 11 arranged on the main line outside the food cage guide rod hole 4 of the anti-hanging shell device 1 is upwards floated, the limit space beans 11 are blocked at the openings of the food cage guide rod holes 4, so that the floating height of the food attracting cage device 2 under water is kept at the height limited by a fisher according to the type and foraging habit of target crabs, the food 12 for attracting crabs is bait arranged according to the food which is loved by the target crabs to be fished, and the outer diameter of the bait is smaller than the inner diameter of the cage opening of the food cage 7.

As shown in fig. 1, 2, 3, 4, 5, 6, 7, 8 and 9, the method for assembling the no-hook throwing and fishing device includes connecting a food cage guide rod 6 to a food cage 7 through a food cage bottom fixing point 15, connecting a buoyancy cover 9 to a cage mouth of the food cage 7 through a food cage mouth hinge 22 and a food cage mouth hinge connecting point 18, disposing a purse net 8 on a surface of a cage body 16 of the food cage 7 through a purse net hanger 20, inserting one end of a main line 10 into a limit space bean 11 and setting a limit distance according to the type of a target crab, inserting the food cage guide rod hole 4 from an outer side of a bottom of a housing 3 of the anti-hanging housing device 1, connecting an end point of the main line 10 to a main line connecting point 14 of the food cage guide rod 6, placing prepared food 12 for attracting crabs into the food cage 7, and then hanging a main line hanger 23 into a buoyancy cover hanging hole 19.

As shown in fig. 1, 8 and 9, the operation principle of catching crabs by the hookless throwing fishing device is that, after the device is thrown into water by a fisher, the device sinks into the water bottom because the underwater weight of the anti-hanging housing device 1 is greater than the buoyancy of the buoyancy cover 9, and the buoyancy cover 9 is greater than the underwater weight of the sum of the food cage 7 and the crab-attracting food 12, so that the food cage 7 filled with the crab-attracting food 12 is pulled out from the food cage inlet 5 of the anti-hanging housing device 1 by the buoyancy cover 9 until the distance of the main line 10 provided with the limit space bean 11, namely the food cage 7 is pulled out by the buoyancy cover 9 to the distance of the limit space bean 11 arranged on the main line 10 blocking the food cage guide rod hole 4, so that the food cage 7 filled with the crab-attracting food 12 is pulled by the buoyancy cover 9 to form a floating posture at a height set on the water bottom, and the crab-attracting food is caught by the taste of the food, when crabs grab and hook food by using the crab pincers, the saw teeth and bone joints of the crab pincers are hooked in the purse net sleeve 8 arranged on the periphery of the food cage 7 and cannot break loose, when the crabs are trapped on the purse net sleeve 8 to break loose, the trapped information of the crabs is transmitted to a fishing rod through a main line, in addition, when the food 12 for attracting the crabs needs to be taken up, the main line 10 pulls the food cage guide rod 6, the food cage guide rod 6 firstly penetrates into the food cage guide rod hole 4, the food cage 7 behind the food cage guide rod 6 and the purse net 8 covering the food cage guide rod smoothly enter the anti-hanging shell device 1 through the food cage inlet 5, and the goal of avoiding the purse net sleeve 8 of the hook-free fishing crab device from being hung by sundries in the process of taking up is achieved.

Claims

1. A no-hook throwing and fishing device is characterized in that the no-hook throwing and fishing device consists of an anti-hanging shell device and a luring food cage device, a food cage guide rod of the luring food cage device is connected with a guide rod connecting point of a food cage through a food cage bottom fixing point, a purse net sleeve covers the surface of the food cage through a purse net sleeve hanging hook, food for luring crabs is arranged in the food cage, a buoyancy cover is folded through a food cage opening and closes the food cage opening through a cage opening hook to form the luring food cage device, the luring food cage device penetrates through a food cage guide rod hole from the inner side of the anti-hanging shell device through a main line arranged at the end point of the food cage guide rod, so that the food cage is arranged in the anti-hanging shell device through a food cage inlet to form the no-hook throwing and fishing device, when the fishhook-free throwing crab fishing device is thrown into water by a fisher, the buoyancy cover pulls the food cage to float out from the food cage inlet of the anti-hanging shell device until the main line sets the distance of the spacing space bean.

2. The device for fishing crabs according to claim 1, wherein the anti-hooking shell means is composed of a housing, a food cage guide hole and a food cage entrance, the housing is a cylindrical metal body made of a metal having a specific gravity greater than that of water and having one closed end, the inner diameter and the length of the device are larger than the outer diameter and the length of the device for inducing the food cage, the weight of the device under water is set to be larger than the buoyancy of the buoyancy cover, the guide rod hole of the food cage is a round hole arranged at the center of the closed end at the bottom of the shell, the inner diameter of the food cage guide rod is larger than the diameter of the food cage guide rod, the length of the food cage guide rod is set to be that when the main line pulls the food cage guide rod into the food cage guide rod hole, the food cage guide rod is limited by the hole wall of the food cage guide rod hole, the food cage at the rear end of the food cage guide rod and the purse net sleeve covering the periphery of the food cage guide rod can smoothly enter the food cage inlet, and the diameter of the food cage inlet is larger than the outer diameter of the food cage attracting device.

3. The device of claim 1, wherein the food cage guiding means comprises a guide bar, a main line connecting point and a food cage bottom fixing point, the guide bar is a straight cylinder made of hard metal having a diameter smaller than the inner diameter of the food cage guide bar hole and a length larger than the length of the anti-hanging case means, the main line connecting point is a hole connected to the main line and provided at one end of the guide bar, the food cage bottom fixing point is a point connected to the guide bar connecting point of the food cage and provided at the other end of the guide bar, the food cage is composed of a cage body, a guide bar connecting point, a food cage opening hinge connecting point, a buoyancy cover hanging hole and a purse net cover hanging hook, the cage body is a mesh-like metal cage made of metal wire and having a bottom without a cover, the guide bar connecting point is a food cage bottom fixing point connected to the food cage guide bar and provided at the center of the bottom of the cage body, the food cage opening hinge joint is a joint point arranged at the edge of a cage opening of the cage body and connected with the food cage opening hinge, the floating cover hanging hole is a hole arranged at a corresponding point of the joint point of the edge of the cage opening of the cage body and the food cage opening hinge, the purse net sleeve hanging hook is a hook arranged at the outer side of the cage body, the purse net sleeve is a net sleeve made of nylon wires with the wire diameter of less than 0.5 mm, the size of the net mesh is determined according to the type and the size of a target crab, the floating cover is composed of a plastic floater, the food cage opening hinge and the cage opening hook, the plastic floater is made of sealed air in the plastic, the shape and the size of the plastic floater are the same as the shape and the size of the cage opening of the cage body, the floating force is set to be less than the underwater weight of an anti-hanging shell device and simultaneously greater than the underwater weight of the food cage and food for attracting the crab, the food cage opening hinge is a hinge arranged at the edge of the plastic floater, the cage opening hook is a hook arranged at the edge of, the main line is a fishing line with a fishing rod connected with a hookless throwing crab fishing device, the limiting space beans are space beans with the outer diameter larger than the inner diameter of a food cage guide rod hole, a fisher sets a limiting device for inducing the height of the food cage device underwater from the water bottom according to the type and foraging habit of a target crab, namely the limiting device for limiting the floating distance of the buoyancy cover to move the food cage inducing device, food for inducing the crab is bait set according to the food which the target crab to be fished likes to eat, and the outer diameter of the bait is smaller than the inner diameter of a cage opening of the food cage.