JP7303548B2 - Apparatus for de-adhering cultured shellfish and method for de-adhering cultured shellfish - Google Patents

Description

The present invention is a cultured shellfish detachment apparatus for releasing the cultured shellfishes from the fixation inside the culture cage for cultivating the cultured shellfishes, which are fixed to the culture cage by the byssus produced by the foreign shellfish such as the oyster shellfish. I will provide a.

Cultured shellfish, such as oyster shells, may be kept in the sea in a culture cage B as shown in FIG. 1, for example, to grow. The aquaculture cage B shown in FIG. 1 is formed by squeezing the net into a drawstring shape on one open bottom surface B3 of the main body, which is formed into a substantially cylindrical shape by covering two annular frames B1 with a net B2. It has a structure having a mouth portion B5 that A culture cage B that is generally used has a size of about 50 cm in diameter and about 25 cm in height. The cultured shellfish is put in and taken out by opening the purse-like opening B5. Normally, a plurality of aquaculture cages B (generally referred to as single-tiered cages) in FIG. 1 are vertically connected with the open bottom surface B3 facing upward and the netted bottom surface B4 facing downward to form a multi-tiered cage BS. thus kept in the sea.

Large numbers of marine organisms adhere to and grow in aquaculture cages held in the sea. Of these, shellfish are particularly problematic. The oyster clam attaches to the net surface of the culture cage, and radiates a large amount of strong byssus threads to fix itself to the net surface. A large number of byssus threads radiating from a plurality of oysters are stretched not only on the surface of the net, but also on cultured oysters and other oysters, and sometimes cover the entire cultivation cage. If byssus threads are stretched all over the cage, the mouth of the cage cannot be opened. Therefore, it is difficult to remove cultured shellfish from the inside.

In order to remove the cultured shellfish from the culture cage, for example, when the cultured shellfish are oyster shells, there is a method in which the cultured cage pulled up from the sea is immersed in hot water at around 70°C for several tens of seconds to kill only the shellfish. It may be done. However, this method requires the work of heating a large amount of seawater on board in a short period of time, pulling up many cultivation cages from the sea, and immersing them in warm seawater.

Currently, when cultivating shellfish are taken out of cultivation cages, the byssus threads are torn off or manually scraped off using tools such as small knives and weeding hoes. However, such manual processing of a large number of cultivation cages is extremely heavy work, which may injure the wrist and cut the net of the cultivation cage. Conventionally, no device has been developed for removing cultured shellfish from a culture cage with byssus threads stretched thereon, and there is no prior art document.

SUMMARY OF THE INVENTION An object of the present invention is to provide a device and method for releasing cultured shellfish, which are fixed by byssus threads of foreign shellfish, from the fixation so that the cultured shellfish can be easily removed from the culture cage.

The present invention was made based on the finding that since the elasticity of byssus thread is extremely low, it can be cut with a slight force when stretched in the length direction.
In one aspect, the present invention provides a cultured shellfish detachment apparatus for releasing cultured shellfish that have been secured by byssus threads of foreign shellfish inside a culture cage. This device is equipped with a plurality of pushing members that sequentially push in a plurality of locations on the net surface of the culture cage from the outside, and the plurality of pushing members push in the plurality of locations on the net surface to produce cultured shellfish and/or cultured shellfish. Alternatively, the foreign shellfish can be moved, thereby cutting the byssus threads of the foreign shellfish.

In one embodiment, each of the plurality of pushing members sequentially moves to the net surface of the aquaculture cage, and each of the plurality of pushing members moved to the net surface can push the plurality of locations of the net surface from the outside. ing. In another embodiment, the device may have a plurality of indenters each including a group of indenters each consisting of several of the plurality of indenters. Each of the plurality of pushing parts is sequentially moved to the net surface of the aquaculture cage, and the pushing members included in each of the plurality of pushing parts that have moved to the screen surface can push the plurality of locations of the net surface from the outside. It's becoming

In one embodiment, each of the plurality of pushers can have a set of pushers and a shaft to which each of the pushers in the set of pushers are spaced from each other. Both ends of the shaft are preferably attached to respective edges of two substrates spaced apart in the lengthwise direction of the shaft. Preferably, the plurality of indentations are arranged to sequentially move to the mesh plane as the two substrates rotate along their central axes. In one embodiment, the apparatus is provided with a plurality of pushing rollers each including a plurality of pushing parts, two substrates, and a rotating shaft passed between them along the central axes of the two substrates. It is preferable that

Another aspect of the present invention is to provide a cultured shellfish detachment method for releasing cultured shellfish that have been secured by byssus threads of foreign shellfish inside a culture cage. This method is characterized by including a step of cutting the byssus threads of the cultured shellfish and/or the foreign shellfish by moving the cultured shellfish and/or the foreign shellfish by pressing the mesh surface of the culture cage from the outside at multiple locations.

According to the device and method for removing entangled cultured shellfishes according to the present invention, a plurality of pushing members repeatedly push the cage from the periphery of the cage, and stretch and cut the byssus thread stretched around in various directions little by little. By this, the cultured shellfish stuck by the byssus thread can be released from the adhesion inside the culture cage. By cutting the byssus threads that are intricately stretched, the cultured shellfish is released from the byssus threads, and the opening of the culture cage becomes easier to open, making it easier for the operator to take out the cultured shellfish from the culture cage. It is possible to reduce the work load and prevent damage to the aquaculture cage.

1 is a perspective view of an aquaculture cage used for cultivating shellfish. FIG. 1 is a perspective view showing the configuration of a cultured shellfish detachment apparatus according to an embodiment of the present invention; FIG. 1 is a perspective view showing the structure of a pushing roller included in a cultured shellfish sticking and loosening device according to an embodiment of the present invention, (a) showing an embodiment in which substrates at both ends are star-shaped, and (b) showing substrates at both ends. Figure 3 shows an embodiment in which the substrate is circular; FIG. 4 is a side view illustrating the operation of components within a cultured shellfish detachment apparatus according to one embodiment of the present invention; FIG. 4 is a schematic diagram for explaining the action of cutting the byssus threads of the foreign shellfish in the cultured shellfish detachment device according to the embodiment of the present invention.

Embodiments of the present invention will be described in detail below with reference to the drawings. In the following detailed description, an embodiment will be described in which the cultured shellfish is an oyster shellfish and the foreign shellfish is an oyster shellfish. The present invention can also be applied to other foreign shells that produce threads.

FIG. 2 is a perspective view showing the configuration of a cultured shellfish detachment device 1 (hereinafter referred to as device 1) according to an embodiment of the present invention. The apparatus 1 comprises a housing 2 having an opening 2a at the top for inserting and removing the culture cage B and having four legs 2b provided with wheels at the bottom. Inside the housing 2, two pushing rollers 10, a rotation auxiliary roller 30, and a watering pipe 50 are arranged. A motor 70 is attached to the outside of the housing 2 to rotate the pressing roller 10 and the auxiliary rotation roller 30 . A receiving basket 5 for receiving foreign substances such as conch clams discharged from the cultivation basket B is arranged between the four legs 2b on the lower side of the housing 2. As shown in FIG.

The two push rollers 10 are attached to the inner lower part of the housing 2 so as to span between the opposing side walls 2c of the housing 2. As shown in FIG. The two pushing rollers 10 are arranged so that their rotation shafts 12 are parallel to each other, and the cultivation basket B is placed thereon. The two pushing rollers 10 are arranged so that the aquaculture cage B placed thereon does not fall. They are spaced apart less than the diameter of the bottom surfaces B3 and B4. The details of the structure of the pressing roller 10 will be described later. As shown in FIG. 1, the aquaculture cage B has a substantially cylindrical shape, and when the byssus thread is cut, this aquaculture cage B is pushed by the pushing rollers 10 so that the two bottom surfaces B3 and B4 face the side. placed on top of That is, the cultivation cage B is arranged so that the side surface B6 is placed on the pushing roller 10 . In addition, it is preferable that a freely rotating auxiliary roller 40 is arranged between the two pushing rollers 10 in parallel with them at a position where the side surface B6 of the cultivation basket B abuts.

The auxiliary rotation roller 30 is mounted above one of the pushing rollers 10 so as to span between the opposing side walls 2c of the housing 2 . The rotation assisting rollers 30 are arranged at a position that contacts the side surface B6 of the cultivation basket B placed on the two pushing rollers 10, and assists the smooth rotation of the cultivation basket B. As shown in FIG. That is, the aquaculture cage B rotates while being held by the two pushing rollers 10 and the auxiliary rotation roller 30 in contact with the side surface B6 during the operation of cutting byssus threads. The auxiliary rotation roller 30 has a cylindrical body 32 that rotates around a central axis and a grooved rubber 34 attached to the surface thereof. Both ends of the cylindrical body 32 are rotatably attached to the side walls 2c. there is

The water spray pipe 50 is attached above the auxiliary rotation roller 30 so as to span between the opposing side walls 2 c of the housing 2 . The sprinkler pipe 50 is hollow, and has a plurality of openings 50a on its side surface so that the water supplied inside is discharged toward the cultivation cage B from the openings 50a. The water discharged from the sprinkler pipe 50 drops into the receiving basket 5 together with the foreign matter while removing the foreign matter from the cultivation basket B.

The two pressing rollers 10 and the auxiliary rotation roller 30 are rotated by a motor 70. As shown in FIG. Specifically, the rotation shafts of one of the pressing roller 10 and the auxiliary rotation roller 30 are connected to a motor 70 by chains or belts 52 and 53 and are rotated by the driving force of the motor 70 . The rotation shafts of the one pressing roller 10 and the other pressing roller 10 are connected by a chain or belt 54, and the rotation of the one pressing roller 10 is transmitted to rotate the other pressing roller 10. The two push-in rollers 10 and the auxiliary rotation roller 30 rotate at a constant speed while being synchronized by the driving force of the motor 70, and the cultivation cage B held by these rollers rotates about the center of the bottom surfaces B3 and B4. do.

Next, the pressing roller 10 will be described in detail. FIG. 3(a) shows the structure of the pressing roller 10 provided in the device 1. FIG. The pushing roller 10 has two star-shaped substrates 14 with six arms 14a. The two substrates 14 are attached to the rotating shaft 12 with a space therebetween. Six shafts 16 are attached to the two substrates 14 so as to span between their corresponding arms 14a, and three discs 18 are attached to each of the six shafts 16 at intervals. It is That is, one pressing roller 10 has six sets, with three discs 18 and one shaft 16 forming one set. The three discs 18 are preferably mounted on the shaft 16 so as to alternate between adjacent sets. The disk 18 in this embodiment corresponds to the pushing member in the claims, the three disks 18 correspond to the pushing member group, and the set of the three disks 18 and the shaft 16 corresponds to the pushing portion. do.

The push-in roller 10 is rotated by a rotational driving force applied to the rotating shaft 12 from the motor 70 , and as it rotates, the plurality of discs 18 move around the rotating shaft 12 so as to draw circular orbits. Therefore, as shown in FIG. 4, which will be described later, each of the sets consisting of the three discs 18 and the shaft 16 moves closer to the mesh surface N on the side surface B6 as the rotary shaft 12 rotates. The three discs 18 juxtaposed with respect to N will move away from the net plane N after pushing in multiple points on the net plane N.

The number, position and size of the discs 18 are not particularly limited, and it is sufficient that a plurality of discs 18 are arranged so as to sequentially hit different positions on the mesh surface as the pushing roller 10 rotates. The number of discs 18 included in each set also need not be the same between sets. In addition, although the disk 18 is used in this embodiment, it is not limited to this, and various shapes such as a polygonal disk and a star-shaped disk can be appropriately used as necessary. . The material of the disk 18 is not particularly limited, but it is preferable that it can be pushed in without damaging the mesh surface and has corrosion resistance. For example, it is preferable to use resin or rubber. Furthermore, the number of arms 14a of substrate 14 and the number of shafts 16 are not particularly limited, and can be increased or decreased as needed. The substrate 14 is not limited to a star shape, and may be circular, for example, as shown in FIG. 3(b).

Next, a method for cutting the byssus threads of foreign shellfish using the device 1 will be described together with the actions realized by the device 1. FIG. FIG. 4 is a side view showing the operation of the components inside the device 1. FIG. FIG. 5 is a schematic diagram for explaining how the device 1 cuts the byssus threads of the foreign shellfish.

First, as shown in FIGS. 2 and 4, the culture cage B pulled up from the sea is put into the housing 2 through the opening 2a and placed on the two pushing rollers 10. As shown in FIGS. The substantially cylindrical aquaculture cage B is arranged so that the two bottom surfaces B3 and B4 face sideways and the side surface B6 rests on the pushing rollers 10 . At this time, the auxiliary rotation roller 30 is also in contact with the side surface B6.

The landed aquaculture cage B is typically in a state as schematically shown in FIG. 5(a). That is, the byssus yarn BY extended from the oyster shell S attached to the outside of the net surface N of the culture basket B is transferred to the oyster shell K inside the culture basket B, the net surface N of the culture basket B, other shell shell S, and the like. , and the byssus threads of a plurality of shellfish S are stretched in a mesh pattern. Byssus BY is so strong that it is said to be the strongest filamentous substance produced by living organisms, and it is necessary to use a sharp knife to cut it.

However, although the byssus BY is strong, it is not stretchable, so if it is a few threads, it can be easily cut by pulling. The present invention utilizes this property of the byssus BY. Some of the byssus threads BY extending in the opposite direction can be cut. 5(b) and 5(c) show this state. In FIG. 5(b), by moving the oyster shell K inside the cultivation basket B in the direction A, the byssus threads BY1, BY2, etc. attached to the side opposite to the direction A when viewed from the oyster shell K are removed. is disconnected. Similarly, in 5(c), by moving the scallop S attached to the outside of the cultivation basket B in the direction A, the byssus thread BY3 attached to the side opposite to the direction A when viewed from the snail S , BY4, etc. are disconnected.

When the motor 70 is driven, one of the pushing rollers 10 and the rotary auxiliary roller 30, which are connected to the motor 70 by chains or belts 52, 53, rotate in the direction of arrow R1, as shown in FIG. Also, the other pressing roller 10 connected to the one pressing roller 10 by a chain or belt 54 also rotates in the direction of arrow R1. The culture cage B in contact with the pushing roller 10 and the auxiliary rotation roller 30 rotates in the direction of arrow R2 as these rollers 10 and 30 rotate. As the pusher roller 10 rotates, a plurality of sets each including three discs 18 and a shaft 16 move in circular orbits about the axis of rotation 12 .

Each of the plurality of sets drawing a circular orbit sequentially approaches the mesh surface N on the side surface B6, and as shown in FIG. It will be pushed in from the outside. At this time, the disk 18 may rotate in either direction r1 depending on the difference between the rotation speed of the pushing roller 10 and the rotation speed of the culture cage B, as shown in FIG. As the six sets move while rotating, the entire circumference of the side surface B6 of the rotating aquaculture cage B is successively hit by a plurality of discs 18 arranged alternately in the adjacent sets, and the mesh surface N is pushed in. A plurality of discs 18 move the oyster shell K inside and the oyster shell S adhering to the net surface N little by little in various directions, and the byssus BY which is stretched is shown in FIGS. 5(b) and 5(c). is gradually cut as shown in . When this action is performed continuously over the entire circumference of the culture basket B, the oyster shell K inside the culture basket B is finally released from the fixed state by the byssus BY, and can be easily removed from the culture basket B.

Reference Signs List 1 cultured shellfish fixation and release device 2 housing 2a opening 2b leg 2c opposing side wall 5 receiving basket 10 pushing roller 12 rotating shaft 14 substrate 14a arm 16 shaft 18 disk 30 rotation auxiliary roller 32 cylindrical body 34 grooved rubber 40 auxiliary roller 50 watering pipe
50a Water sprinkling port 52, 53, 54 Chain or belt 70 Motor B Cultivation basket B1 Frame B2 Net B3 Opening bottom B4 Bottom B5 Mouth B6 Side N Net surface BY Bysin K Oyster S Shellfish

Claims (7)

A farmed shellfish detachment device for releasing farmed shellfish from sticking by the byssus threads of foreign shellfish inside a culture cage,
A plurality of pushing members configured to move cultured shellfish and/or foreign shellfish by sequentially pushing a plurality of locations on the mesh surface of the culture basket from the outside, thereby cutting the byssus threads of the foreign shellfish. Cultivated shellfish fixation release device. Each of the plurality of pushing members is adapted to move sequentially to the mesh surface of the culture cage,
Each of the plurality of pushing members moved to the mesh surface pushes a plurality of locations on the mesh surface from the outside,
The cultured shellfish fixation disengagement device according to claim 1. having a plurality of pushers each including a pusher member group consisting of some of the plurality of pushers;
Each of the plurality of push-in parts is adapted to move sequentially to the mesh surface of the culture cage,
The pushing member group included in each of the plurality of pushing parts moved to the mesh surface pushes a plurality of locations on the mesh surface from the outside,
3. The cultured shellfish sticking and loosening device according to claim 1 or 2. Each of the plurality of pushers has the pusher member group and a shaft on which each pusher member in the pusher member group is mounted with a spacing from each other, and both ends of the shaft extend in the length direction of the shaft. attached to the edge of each of the two spaced apart substrates;
The plurality of indentations are sequentially moved to the mesh surface as the two substrates rotate along their central axes,
The cultured shellfish sticking and breaking device according to claim 3. a plurality of pressing rollers each including the plurality of pressing portions, the two substrates, and a rotation shaft extending between the two substrates along the central axes of the two substrates; characterized by
5. The cultured shellfish fixation disengagement device according to claim 4. A cultured shellfish detachment method for releasing a cultured shellfish that has been fixed by the byssus threads of a foreign shellfish inside a culture cage, comprising:
Including a step of cutting the byssus threads of the foreign shellfish by moving the cultured shellfish and/or the foreign shellfish by pushing in multiple places on the mesh surface of the culture cage from the outside,
A cultured shellfish fixation method. 7. The cultured shellfish detachment method according to claim 6, further comprising the step of rotating the culture cage.

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