JPS6143008B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for lifting a net in a fish introduction part using a buoyancy device in removing the net from a fixed net, replacing the net, inspecting the depth of the net, etc. The present invention relates to a network method and apparatus used therefor.

Conventionally, a method has been proposed to facilitate the net-lifting work of nets such as fixed nets, playground nets, corral nets, fence nets, and side nets, etc., by using a buoyancy device (especially 127880).

In this method, a buoyancy device with a built-in gas generator is installed in advance at the point where the net is lifted when the fixed net is laid.
Thereafter, when hoisting the net, power is supplied to the gas generator through a cable, the gas generator is operated, and the generated gas floats the buoyancy device to lift the net.

This method is superior in terms of labor and mechanical power savings compared to the conventional methods of lifting nets onboard ships manually and using winches, etc.; Connected cables are affected by tidal currents and are likely to be cut, making it impossible to operate the buoyancy device, and shellfish and seaweed attaching to the buoyancy device increase its weight, which affects the nets being hauled. In addition, the buoyancy devices must be pressure resistant, which increases the size and weight, which also affects the lifting net, and the buoyancy devices must be corrosion resistant. There are economical problems related to the material used, and when the fixed nets are laid, there are problems such as poor workability due to the buoyancy devices and long cables attached to the nets.

The purpose of the present invention is to eliminate these drawbacks of the conventional
By attaching a buoyancy device to the fixed net just before hoisting the net, it prevents the cable from being cut, making lifting the net easier and more reliable, and improving workability when laying the fixed net. The purpose of the present invention is to provide a network method and a device used therefor.

That is, before laying a fixed net, a rope fitting through which a guide rope is passed is fixed in advance to the net lifting point of the fixed net, and then the fixed net is laid, and when the net is subsequently lifted, one end of the guide rope is fixed on the ship. Attach a backstop, connect a buoyancy device to the backstop, send the backstop and buoyancy device into the water while pulling up the other end of the guide rope, and pass the backstop through the rope fitting. This is a method for lifting a fixed net, in which the fixed net is then floated and lifted by operating the buoyancy device. The equipment used in this method includes a rope attachment that is fixed to the net lifting point of the fixed net, a guide rope that is passed through the rope attachment, and a rotary movement that is attached to one end of the guide rope. A device consisting of a non-return device with a built-in spring that is equipped with three or more blades and can expand and contract in conjunction with the rotational movement of the blades, and a buoyancy device that is connected to the non-return device and has a built-in gas generator. It is.

Next, the present invention will be specifically explained using examples shown in the drawings. In the example of the method for lifting a fixed net according to the present invention, a method particularly aimed at lifting a fixed net for climbing outside will be described, but the method can be similarly implemented for other types of fixed nets.

FIG. 1 is a cross-sectional explanatory diagram showing the state of the outbound net after the fixed net has been laid, in connection with the fixed net hauling method of the present invention.

In FIG. 1, the rope attachment device 3 is fixed in advance to the net hoisting point of the outbound net 1 on land or on a ship with, for example, a nylon rope before laying the fixed net, and then the guide rope 4 is attached to the rope attachment device 3. Through
Both ends of this guide rope 4 are tied to form a loop.

This fixed net is then laid in the desired sea area.

As shown in FIG. 1 after the fixed net is laid, the guide rope 4 will prevent fish from entering the net 1 if left as is, so it is desirable to fix it to the side of the net 1.

In Fig. 1, 2 indicates the fence of the fixed net, and 13 indicates the seabed.

Next, the apparatus of the present invention will be explained.

FIG. 2 is an explanatory diagram including a partially sectional view showing one embodiment of the apparatus of the present invention.

The device shown in FIG. 2 consists of a rope attachment 3, a guide rope 4, a buoyancy device 5, and a backstop 12. The rope attachment 3 consists of a framework with a space 22 in the center. Reference numeral 22 denotes a space 22 through which a reverse stopper main body 17, which will be described later, can pass. Further, one side of the framework of the rope attachment 3 is made of a roller 24 so that the reverse stop 12 can easily pass under any circumstances. In addition, the rope attachment 3 is made of a lightweight synthetic resin selected from vinyl chloride, nylon, etc., taking into account the weight when the net is lifted.

The guide rope 4 is made of nylon or the like, and its length is at least twice the water depth from the bottom of the climbing net 1 to the sea surface.

The buoyancy device 5 includes a gas generator 6 composed of a solid gas generating agent 9, a coolant 10, and an igniter 11, and an igniter 11 used to supply electric power to the igniter 11.
a cable 8 connected to a conductor, and an inflatable bag body 7
This is a conventional buoyancy device 5 consisting of.

In FIG. 2, 13 shows the seabed, 25 shows the fixing part of the rope attachment 3 to the climbing net 1, 27 shows the rope, and 28 shows the connecting ring of the buoyancy device 5.

The reverse stop 12 will be explained with reference to FIG.

FIG. 3 is a longitudinal cross-sectional view showing one embodiment of a reverse stop that is part of the device of the present invention.

In FIG. 3, the reverse stop 12 is the rope attachment 3.
, which has a function that allows passage in the forward direction but not in the backward direction,
The reverse stopper 12 includes a reverse stopper main body 17 and an upper mounting bracket 1.
8 and a connecting fitting 19 for connecting both of them, the reverse stop main body 17 has a lower rope attachment fitting 21 for connecting the buoyancy device 5 at one end thereof, and is rotatable near its center. It has four blades 14 fastened near one end to the blade 14, and has a built-in spring 15 in its center that touches one end of the blade 14 and expands and contracts in conjunction with the rotational movement of the blade 14. A shaft 16 that can move up and down in conjunction with the expansion and contraction movement of the spring 15 is built inside the shaft 15 . The center of the connecting fitting 19 is connected to the shaft 1.
6, and connects the reverse stopper main body 17 and the upper mounting bracket 18 with a pin 23. The upper attachment fitting 18 has an upper rope attachment fitting 2 for tying the guide rope 4 to one end thereof.
0.

Here, the blades 14 are provided so that a portion of the blades 14 protrudes from the reverse stopper main body 17 when no force is applied from the outside. Further, as shown in FIG. 3, the angle formed by the blade 14 and the shaft 16 should be less than 90 degrees with respect to the forward direction (upward in FIG. 3) to facilitate passage into the rope attachment 3. This is desirable. In addition, if the number of blades 14 is one or two, when the reverse stopper 12 passes through the space 22 of the rope attachment 3, it may not pass through the center of the space 22 and be biased, making it difficult to pass through. On the other hand, after passing, there is a possibility that the reverse stopper 12 may come off without being caught on the rope attachment 3 when moving in the backward direction, so the number of blades 14 should be at least three.

In addition to the embodiments of the non-return device 12 described above, a non-return device with a simple structure in which a horizontally built-in spring that expands and contracts in conjunction with the rotational movement of the blade can also be used in the device of the present invention.

Next, a method for hoisting a set net after laying the set net using the apparatus of the present invention will be described.

When hoisting the fixed fishing net 1, first unfasten the guide rope 4 fixed to the side surface of the fishing net 1 shown in FIG. 1, and then untie the ring-shaped guide rope 4 itself. , guide rope 4 on board
Attach the upper rope fitting 20 of the reverse stop 12 shown in FIG. 3 to one end, and then connect the lower rope fitting 21 of the reverse stop 12 to the buoyancy device 5 shown in FIG. The ring 28 is connected with a rope 27.

Next, while pulling up the other end of the guide rope 4, the reverse stop 12 and the buoyancy device 5 are sent into the water.
When the reverse stop 12 reaches the rope attachment 3 fixed to the underwater climbing net 1, the other end of the guide rope 4 is further pulled up. At this time, the reverse stop main body 17 shown in FIG. 3 passes through the space 22 of the rope attachment 3 and hits the framework of the rope attachment 3 at the blade 14 portion. Furthermore, when the other end of the guide rope 4 is pulled up, force (downward force in FIG. 3) is applied to the blade 14, so the blade 14 begins to rotate inside the non-returning device body 17, and along with this, the spring 15 is contracted, and at the same time the shaft 16 is pushed upward. When the blade 14 finishes passing through the rope attachment 3, the force applied to the blade 14 is released, and the stored force of the spring 15 is released.
is released and rotates the blade 14 outward, causing a portion of the blade 14 to protrude outside the non-returning device 12 again. The state after the rope fitting 3 has passed through the reverse stop 12 is shown in FIG.

Next, power can be supplied directly to the igniter 11 of the buoyancy device 5 shown in FIG. Power is supplied by remote control. The buoyancy device 5 is activated by the supply of electric power, and the buoyancy device 5 begins to float. At this time, the reverse stop 12 is pulled up to the side of the connected buoyancy device 5 and retreats, but its blade 1
4 is caught on the rope attachment 3, and as a result, the rope attachment 3 and the climbing net 1 are floated at the same time.

FIG. 4 is an explanatory cross-sectional view showing the state of the hoisting net after the buoyancy device is operated.

In Figure 4, 1 is a climbing net, 2 is a fence net, and 4 is a fence net.
indicates a guide rope, 5 indicates a buoyancy device, 8 indicates a cable, 13 indicates the seabed, and 26 indicates a ship.

The fixed net lifting method shown in the above example has the following features compared to the conventional method in which a buoyancy device is attached in advance to the net lifting portion of the net when the fixed net is laid.

The fixed net lifting method of the present invention allows the buoyancy device to be installed just before lifting the net, even if the time from the setting of the fixed net to the time of lifting the net is long (usually about half a year). High reliability as the cable will not be easily cut and the buoyancy device can be operated reliably.

In addition, when lifting nets, there is no weight increase due to shellfish, seaweed, etc. that attach to the buoyant nets, unlike in the conventional method, which makes lifting the nets easier. It has features such as good workability as there is no equipment or accompanying cables.

Further, the apparatus used in the method for lifting a fixed net according to the present invention has the following characteristics.

That is, the fixed net lifting method of the present invention becomes possible only by using the device of the present invention, and is characterized by a simple structure, easy operation, and reliable operation. Yes, buoyancy device,
Since the reverse stopper is not immersed in the sea for a long period of time, there is no need to give unnecessary consideration to its corrosion resistance and pressure resistance.

In addition, after the net is lifted, it can be used at any time by simply washing it with water and applying anti-rust treatment, and there is no need to remove shellfish and seaweed attached to the buoyancy generator as in conventional methods. It has the following.

As explained in detail above, the fixed net lifting method of the present invention has good workability when laying the net and lifting the net.
Furthermore, this method is much superior to conventional methods in that it is possible to reliably haul the nets, and furthermore, the work after hauling the nets is simple. Furthermore, the device used in this method has a simple structure, is easy to operate, and operates reliably, making it the most suitable device for use in the fixed net lifting method of the present invention.

In addition to the method of lifting fixed nets, this device can also be used, for example, to retrieve underwater objects, and to pull up anchors underwater.

[Brief explanation of the drawing]

FIG. 1 is an explanatory cross-sectional view showing the state of the outbound net after laying the fixed net, FIG. 2 is an explanatory view including a partial cross-sectional view showing one embodiment of the device of the present invention,
The figure is a longitudinal cross-sectional view showing one embodiment of the reverse stop that is a part of the device of the present invention, and FIG. 4 is a cross-sectional explanatory view showing the state of the hoisted net after the floating device is operated. 1: Climb net, 2: Fence net, 3: Rope attachment,
4: Guide rope, 5: Buoyancy device, 6: Gas generator, 12: Back stop, 14: Vane, 15: Spring, 1
6: Axis, 26: Ship.

Claims (1)

[Claims] 1. In a method for lifting a fixed net using a buoyancy device with a built-in gas generator, before laying the fixed net, a rope fitting through which a guide rope is passed is fixed in advance to the lifting point of the fixed net, and then The fixed net is laid in advance, and when the net is subsequently lifted, a check is attached to one end of the guide rope on board the ship, a buoyancy device is connected to the check, and the other end of the guide rope is pulled up while the net is pulled up. A set net lifting method characterized in that a back stop and a buoyancy device are sent into the water, and after the back stop is passed through the rope attachment device, the set net is floated and lifted by activating the buoyancy device. net method. 2. A rope attachment that is fixed to the net lifting point of the fixed net, and a guide rope that is passed through the rope attachment,
A non-return device having three or more blades attached to one end of the guide rope and fastened to allow rotational movement, and having a built-in spring capable of expanding and contracting in conjunction with the rotational movement of the blades, and the non-reversal device. A device used for lifting fixed nets, characterized by comprising a buoyancy device with a built-in gas generator connected to a buoyancy device.