JP2021090363A - Aquaculture shellfish fixation disassembling device and aquaculture shellfish fixation disassembling method - Google Patents

Abstract

To provide a device for releasing an aquaculture shellfish fixed to an aquaculture basket by byssus of a foreign shellfish.SOLUTION: An aquaculture shellfish fixation disassembling device 1 is provided for releasing an aquaculture shellfish fixed to an aquaculture basket B by byssus of a foreign shellfish in the inside of the aquaculture basket B. There are included multiple pushing members 10 for sequentially pushing multiple places of a net surface N of the aquaculture basket B from the outside. The multiple pushing members 10 push the multiple places of the net surface N, and thereby the aquaculture shellfish and/or the foreign shellfish are moved and the byssus of the foreign shellfish can be cut by that.SELECTED DRAWING: Figure 2

Description

The present invention is an apparatus for releasing a farmed mussel fixed to the cultivated mussel by a foot thread produced by a foreign mussel such as a mussel inside the cultivated mussel for culturing the cultivated mussel. I will provide a.

Cultured shellfish such as oyster shellfish may be kept in the sea in a state of being placed in a culture cage B as shown in FIG. 1, for example, and may be grown. The aquaculture basket B shown in FIG. 1 is formed by covering two annular frames B1 with a net B2 to form a substantially cylindrical body and by squeezing the net on one of the open bottom surfaces B3 of the main body in a purse-like shape. It has a structure having a mouth portion B5. The commonly used aquaculture basket B has a diameter of about 50 cm and a height of about 25 cm. The farmed shellfish is taken in and out by opening the purse-shaped mouth B5. Normally, a plurality of aquaculture baskets B (generally referred to as single-stage baskets) in FIG. 1 are vertically connected to form a multi-stage basket BS with the bottom surface B3 of the opening facing upward and the bottom surface B4 with a net facing downward. It is held in the sea in this way.

A large amount of marine organisms attach to and grow in aquaculture cages held in the sea. Of these, the mussels are of particular concern. The mussels adhere to the net surface of the farm cage, and a large amount of high-strength "byssus" are radially stretched to fix themselves to the net surface. A large number of byssus that radiate from multiple mussels are laid out in a mesh pattern not only on the net surface but also on the cultivated mussels and other mussels, and may cover the entire aquaculture cage. When the byssus is stretched all over the aquaculture cage, the mouth of the aquaculture cage does not open, and even if the mouth is open, the aquaculture shells inside are stuck to the net surface by a large number of byssus extending from the entire circumference. Therefore, it is difficult to take out the cultured shellfish from the inside.

In order to remove the farmed mussels from the oysters, for example, when the oysters are oysters, the method of killing only the oysters by immersing the cultivated mussels in hot water at around 70 ° C for several tens of seconds. It may be done. However, this method requires the work of heating a large amount of seawater on board in a short time, withdrawing many aquaculture cages from the sea, and immersing them in warm seawater.

Currently, when taking out cultured shellfish from a farming basket, the byssus is torn off or the byssus is manually scraped off using a tool such as a knife or a hoe for weeding. However, processing large numbers of aquaculture cages manually can be extremely labor intensive, can result in wrist injuries, and can even cut nets in the aquaculture cages. There has been no device developed for extracting cultured mussels from a farmed cage in which byssus is stretched, and there is no prior art document.

An object of the present invention is to provide an apparatus and a method for releasing a cultured mussel fixed by byssus of a foreign body mussel from the sticking so that the cultivated mussel can be easily taken out from the cultivated cage.

The present invention has been made based on the finding that since the elasticity of the byssus is extremely low, it can be cut even with a slight force when it is stretched in the length direction.
In one aspect of the present invention, there is provided a cultivated mussel sticking release device for releasing the cultivated mussel fixed by the byssus of a foreign mussel inside the culturing cage from sticking. This device is provided with a plurality of pushing members that sequentially push in a plurality of places on the net surface of the farming cage from the outside, and the plurality of pushing members push in the plurality of places on the net surface to push the cultured shellfish and /. Alternatively, the foreign body shell can be moved, thereby cutting the foot thread of the foreign body shell.

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 a plurality of points on the net surface from the outside. ing. In another embodiment, the device may have a plurality of push-in portions, each of which includes a push-in member group composed of some of the plurality of push-in members. Each of the plurality of push-in portions sequentially moves to the net surface of the aquaculture cage so that the push-in member group included in each of the plurality of push-in portions that have moved to the net surface can push in a plurality of places on the net surface from the outside. It has become.

In one embodiment, each of the plurality of push-in portions may have a push-in member group and a shaft in which the push-in members in the push-in member group are attached to each other at intervals. Both ends of the shaft are preferably attached to the edges of each of the two substrates that are spaced apart from each other in the length direction of the shaft. It is preferable that the plurality of push-in portions are configured to sequentially move to the net surface as the two substrates rotate along their central axes. In one embodiment, the apparatus is provided with a plurality of push rollers, each of which includes a plurality of push portions, two substrates, and a rotating shaft passed between them along the central axis of the two substrates. It is preferable that it is.

Another aspect of the present invention provides a method for releasing a cultured mussel fixed by the byssus of a foreign mussel inside a cultivated cage from sticking. This method is characterized by including a step of cutting the byssus of the foreign body shellfish by moving the cultured shellfish and / or the foreign body shellfish by pushing a plurality of points on the net surface of the culture cage from the outside.

According to the cultured shellfish fixing and disassembling device and the method according to the present invention, a plurality of pushing members repeatedly push the cage from around the farmed cage, and the stretched byssus is gradually stretched and cut in various directions. This allows the farmed mussels stuck by the byssus to be released from sticking inside the farm cage. By cutting the intricately stretched foot thread, the farmed shellfish is released from sticking by the foot thread, and the mouth of the farmed cage can be easily opened, which makes it easier to remove the farmed shellfish from the farmed cage. It is possible to reduce the work load and prevent damage to the aquaculture basket.

It is a perspective view of the aquaculture basket used for the cultivation of shellfish. It is a perspective view which shows the structure of the cultured shellfish sticking loosening apparatus by one Embodiment of this invention. It is a perspective view which shows the structure of the pushing roller included in the cultured shellfish sticking loosening apparatus by one Embodiment of this invention, (a) shows the embodiment which the substrate at both ends has a star shape, and (b) is the both ends. An embodiment in which the substrate is circular is shown. It is a side view which shows the operation of the component inside the cultured shellfish sticking loosening apparatus by one Embodiment of this invention. It is a schematic diagram for demonstrating the action which cuts the byssus of a foreign body mussel in the cultivated mussel sticking loosening apparatus by one Embodiment of this invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following detailed description, the case where the cultured shellfish is an oyster shellfish and the foreign shellfish is a oyster shellfish will be described as an embodiment, but the present invention is not limited to this, and other cultured shellfish and legs 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 fixing and separating device 1 (hereinafter referred to as device 1) according to an embodiment of the present invention. The device 1 includes a housing 2 having an opening 2a at the upper part for moving the aquaculture basket B in and out, and having four legs 2b provided with wheels at the lower part. Inside the housing 2, two pushing rollers 10, a rotation assisting roller 30, and a watering pipe 50 are arranged. A motor 70 for rotating one of the pushing rollers 10 and the rotation assisting rollers 30 is attached to the outside of the housing 2. Between the four legs 2b below the housing 2, a receiving basket 5 for receiving foreign substances such as mussels discharged from the aquaculture cage B is arranged.

The two push-in rollers 10 are attached below the inside of the housing 2 so as to be passed between the opposite side walls 2c of the housing 2. The two push rollers 10 are arranged so that their respective rotation axes 12 are parallel to each other, and the aquaculture basket B is placed on them. The two push rollers 10 are arranged so that the aquaculture basket B on which the aquaculture basket B is placed does not fall. They are arranged at intervals smaller than the diameters of the bottom surfaces B3 and B4. Details of the structure of the push roller 10 will be described later. The culture cage B has a substantially cylindrical shape as shown in FIG. 1, and when cutting the byssus, the culture cage B is pushed into the culture cage B so that the two bottom surfaces B3 and B4 face sideways. Place on top. That is, the aquaculture basket B is arranged so that the side surface B6 rests on the push roller 10. It is preferable that an auxiliary roller 40 that rotates freely is arranged between the two pushing rollers 10 at a position where the side surface B6 of the aquaculture cage B hits in parallel with these.

The rotation assisting roller 30 is attached above one of the pushing rollers 10 so as to be passed between the opposite side walls 2c of the housing 2. The rotation assist roller 30 is arranged at a position corresponding to the side surface B6 of the aquaculture cage B placed on the two push rollers 10 to assist the smooth rotation of the aquaculture cage B. That is, the aquaculture basket B rotates while the two pushing rollers 10 and the rotation assisting rollers 30 are in contact with the side surface B6 and are held during the work of cutting the byssus. The rotation assist roller 30 has a cylindrical body 32 that rotates around a central axis and a grooved rubber 34 attached to the surface thereof, and both ends of the cylindrical body 32 are rotatably attached to the side wall 2c. There is.

The watering pipe 50 is attached above the rotation assisting roller 30 so as to be passed between the opposite side walls 2c of the housing 2. The watering pipe 50 is hollow and is provided with a plurality of openings 50a on the side surface so that the water supplied to the inside is discharged from the openings 50a toward the aquaculture cage B. The water discharged from the watering pipe 50 falls into the receiving basket 5 together with the foreign matter while removing the foreign matter from the aquaculture basket B.

The two pushing rollers 10 and the rotation assisting rollers 30 are rotated by a motor 70. Specifically, the rotating shafts of one of the pushing rollers 10 and the rotation assisting rollers 30 are connected to the motor 70 by chains or belts 52 and 53, and rotate by the driving force of the motor 70. The rotation shafts of one push roller 10 and the other push roller 10 are connected by a chain or a belt 54, and the rotation of one push roller 10 is transmitted to rotate the other push roller 10. The two pushing rollers 10 and the rotation assisting rollers 30 rotate at a constant speed in synchronization with the driving force of the motor 70, and the aquaculture cage B held by these rollers rotates about the centers of the bottom surfaces B3 and B4. To do.

Next, the pushing roller 10 will be described in detail. FIG. 3A shows the structure of the push roller 10 included in the device 1. The push roller 10 has two star-shaped substrates 14 having six arms 14a. The two substrates 14 are attached to the rotating shaft 12 at intervals. Six shafts 16 are attached to the two substrates 14 so as to be sandwiched between the corresponding arm portions 14a of the two, and three disks 18 are attached to each of the six shafts 16 at intervals from each other. Has been done. That is, one push-in roller 10 has six sets, with three disks 18 and one shaft 16 as one set. The three disks 18 are preferably mounted on the shaft 16 so as to stagger between adjacent sets. The disk 18 in the present 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. To do.

The pushing roller 10 is rotated by a rotational driving force applied to the rotating shaft 12 by the motor 70, and the plurality of disks 18 move in a circular orbit around the rotating shaft 12 according to the rotation. Therefore, each of the set consisting of the three disks 18 and the shaft 16 moves so as to approach the net surface N of the side surface B6 with the rotation of the rotating shaft 12, as shown in FIG. 4 described later, and the net surface After the three disks 18 juxtaposed with respect to N push in a plurality of locations on the net surface N, they move away from the net surface N.

The number, position, and size of the disks 18 are not particularly limited, and the plurality of disks 18 may be arranged so as to sequentially hit different positions on the mesh surface as the pushing roller 10 rotates. The number of disks 18 included in each set does not have to be the same between sets. Further, although the disk 18 is used in the present embodiment, the disk 18 is not limited to this, and various shapes such as a polygonal disk and a star disk can be appropriately used as needed. .. The material of the disk 18 is not particularly limited, but it is preferably one that can be pushed in without damaging the net surface and has corrosion resistance, and for example, resin or rubber is preferably used. Further, the number of arms 14a of the substrate 14 and the number of shafts 16 are not particularly limited, and can be appropriately 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 of cutting the byssus of a foreign body shell using the device 1 will be described together with the action realized by the device 1. FIG. 4 is a side view showing the operation of the components inside the device 1. FIG. 5 is a schematic view for explaining the action of cutting the byssus of a foreign body shell in the device 1.

First, the aquaculture basket B lifted from the sea is placed inside the housing 2 through the opening 2a and placed on the two push rollers 10 as shown in FIGS. 2 and 4. The substantially cylindrical aquaculture basket B is arranged so that the two bottom surfaces B3 and B4 face sideways and the side surface B6 rests on the push roller 10. At this time, the rotation assist roller 30 also comes into 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 foot thread BY extending from the oyster shell S attached to the outside of the net surface N of the aquaculture cage B is the oyster shell K inside the aquaculture cage B, the net surface N of the aquaculture cage B, and other oyster shells S. The foot threads of a plurality of oyster shells S are stretched in a mesh pattern. This byssus BY is so strong that it is said to be the strongest among the thread-like substances produced by living organisms, and it is necessary to use a sharp blade to cut it.

However, since the byssus BY has high strength but is not elastic, it can be easily cut by pulling a few byssus. The present invention utilizes this property of the byssus BY, for example, by moving the positions of the oyster shell K and the oyster shell S fixed by the byssus BY as much as possible (for example, about 10 mm to 20 mm). It is possible to cut some of the byssus BY extending in the direction opposite to the vertical direction. 5 (b) and 5 (c) show this state. In FIG. 5B, by moving the oyster shell K inside the culture cage B in the direction of A, the byssus BY1, BY2, etc. attached to the side opposite to the direction of A when viewed from the oyster shell K, etc. Is disconnected. Similarly, in 5 (c), by moving the mussel S attached to the outside of the culture cage B in the direction of A, the byssus BY3 attached to the side opposite to the direction of A when viewed from the mussel S. , BY4, etc. are disconnected.

When the motor 70 is driven, one of the pushing rollers 10 and the rotation assisting rollers 30 connected to the motor 70 by the chains or belts 52 and 53 rotate in the direction of the arrow R1 as shown in FIG. Further, the other pushing roller 10 connected to the one pushing roller 10 by the chain or the belt 54 also rotates in the direction of the arrow R1. The aquaculture cage B in contact with the pushing roller 10 and the rotation assisting roller 30 rotates in the direction of the arrow R2 as the rollers 10 and 30 rotate. When the push roller 10 rotates, a plurality of sets each including the three disks 18 and the shaft 16 move in a circular orbit around the rotation shaft 12.

Each of the plurality of sets drawing a circular orbit approaches the net surface N of the side surface B6 in order, and as shown in FIG. 5 (d), the disk 18 sequentially hits the net surface N, and a plurality of points of the net surface N are formed. It will be pushed in from the outside. At this time, as shown in FIG. 4, 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 aquaculture cage B. As the six sets move while rotating, a plurality of disks 18 alternately arranged in the adjacent set hit the entire circumference of the side surface B6 of the rotating aquaculture cage B in sequence, and push the net surface N. A plurality of disks 18 move the oyster shell K and the oyster shell S attached to the net surface N in various directions little by little, and the byssus BY stretched around is shown in FIGS. 5 (b) and 5 (c). It is gradually cut as shown in. When this action is continuously performed over the entire circumference of the culture cage B, the oyster shell K inside the culture cage B is finally released from the sticking state by the byssus BY, and it becomes easy to take out from the culture cage B.

1 Cultured shellfish fixing and disassembling 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 Disc 30 Rotating auxiliary roller 32 Cylindrical body 34 Grooved rubber 40 Auxiliary roller 50 Watering pipe
50a Sprinkler 52, 53, 54 Chain or belt 70 Motor B Culture basket B1 Frame B2 Net B3 Open bottom B4 Bottom B5 Mouth B6 Side N Net surface BY Byssus K Oyster shell S

Claims (7)

It is a cultivated mussel sticking release device for releasing the cultivated mussels fixed by the byssus of foreign mussels inside the cultivated cage.
The cultured shellfish and / or the foreign body shellfish can be moved by sequentially pushing the net surface of the culture cage from the outside, thereby providing a plurality of pushing members configured to cut the foot thread of the foreign body shellfish. A device for fixing and removing cultured shellfish. Each of the plurality of pushing members sequentially moves to the net surface of the aquaculture cage.
Each of the plurality of pushing members that have moved to the net surface pushes a plurality of points on the net surface from the outside.
The cultured shellfish sticking and separating device according to claim 1. Each has a plurality of pushing portions including a group of pushing members composed of some of the plurality of pushing members.
Each of the plurality of push-in portions sequentially moves to the net surface of the aquaculture cage.
The pushing member group included in each of the plurality of pushing portions that have moved to the net surface pushes a plurality of points on the net surface from the outside.
The farmed shellfish sticking and separating device according to claim 1 or 2. Each of the plurality of pushing portions has a pushing member group and a shaft in which the pushing members in the pushing member group are attached to each other at intervals, and both ends of the shaft are oriented in the length direction of the shaft. It is attached to the edge of each of the two spaced boards.
The plurality of push-in portions are characterized in that the two substrates sequentially move to the net surface as they rotate along their central axes.
The apparatus for sticking and separating cultured shellfish according to claim 3. A plurality of pushing rollers each including the plurality of pushing portions, the two substrates, and a rotating shaft passed between the two substrates along the central axis of the two substrates are provided. Characteristic,
The apparatus for sticking and separating cultured shellfish according to claim 4. This is a method for releasing the cultivated mussels that have been fixed by the byssus of foreign mussels inside the culturing cage.
Including the step of cutting the byssus of the foreign body shell by moving the cultured shellfish and / or the foreign body shellfish by pushing multiple points on the net surface of the culture cage from the outside.
How to remove the fixed shellfish. The method for separating aquaculture mussels according to claim 6, further comprising a step of rotating the aquaculture basket.

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