SU1452511A1 - Trawl net - Google Patents

Abstract

The invention relates to industrial fishing, in particular to trawls, in which the entrance to the knot closes when the towing speed decreases. The purpose of the invention is to increase the reliability of work by reducing the efforts to close the mouth of the terminal. The frame 2 is fixed inside the cage 1. Netting plates 7, 8 are attached to the cross beams of the frame 2. Hydrodynamic plates 5 and 6 are fixed to the opposite edges of them; The sides of the plates 5, 6 are provided with openings, and the plates 7 and 8 are provided with rings for mixing along the side racks of the frame. During trawling, the hydrodynamic plates 5 and 6 with the net plates 7, 8 are diverted to the crossbars of the frame 2. When the towing speed decreases, the net plates 7, 8 block the entrance to the groove. 9 il.

Description

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I The invention relates to field fishing, namely to trawls, equipped with devices for closing the entrance to the knot while reducing the towing speed.

The purpose of the invention is to increase the reliability of work by reducing the efforts of the closure of the mouth.

1 FIG. 1 shows a trawl, a top view of the connection portion of a trawl section with a hook; in fig. 2 - the same, front view of the fixture for closing the kutka; in fig. 3 - the same, side view (layout of plates on the frame racks); in fig. 4 - frame, | front view; in fig. 5 - the same, side view;

in fig. 6 - removable rods; in fig. 7-9 - hydrodynamic plate in three projections.

The trawl contains a duck 1, equipped with a device for closing it. The latter includes a frame 2 with longitudinal holes in the side drains formed by removable rods 3 and 4. In the holes of the frame

2, with the possibility of vertical movement, two hydrodynamic plates 5. And 6 are installed one above the other. The top 5 of them has a negative floating surface, and the bottom 6 has a positive surface. Hydrodynamic plates 5 and 6 are connected to the removable web of the cage 1 by means of net plates 7 and 8, one of the longitudinal edges of each of which is fixed on the hydrodynamic plate 6 or 5, and | ha - on the corresponding cross-frame | | 2, mounted on the netting cloth kutka | 1. The side edges of the net plates 7 and 8 are put on the rods 3 by means of rings 9 | With the possibility of movement. Frame 2 is fastened inside the coffin 1 by means of flexible ones; elements 10. Hydrodynamic plates: 5 and 6 are made with openings at the ends for movement along the rods 4. Plates 5 and 6 are made with bevels on the water flow side.

In the process of trawling, hydrodynamic forces arising from the pressure of water on the speeds of the plates 5 and 6,

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The gravity force of the plate 5 and the lifting force of the plate 6 are forced out. Therefore, the hydrodynamic plate 5 having negative buoyancy rises, and the hydrodynamic plate 6 having positive buoyancy descends. In this case, the net plates 7 and 8 are assembled into bundles near the crossbars of the frame 2, opening the entrance to the knot.

After the trawling is completed, the water pressure on the velocity surfaces of the plates 5 and 6 decreases. Plate 5, having a negative buoyancy, is lowered down. She rises towards plate b, having a positive buoyancy. The net plates 7 and 8 fixed on the hydrodynamic plates block the entrance to the knot 1.

Since in this case the netting of the kutka retains its previous position, and the lateral edges of the netting plates evenly move along the rods together with the rings attached to them, the closing of the kutka takes place with less force. This increases the reliability of closing the entrance to the jaw while reducing the speed of trawling.

Claims (1)

Invention Formula A trawl containing a knit and a device for closing it, comprising a frame with longitudinal holes in the side columns, two hydrodynamic plates mounted one above the other with vertical movement, connected to the net canvas of the kutka and having top negative, bottom - positive buoyancy, which is different in that, in order to increase the reliability of operation by reducing the effort to close the mouth of the cage, the device is equipped with two net plates that have rings on the side edges, The frame side racks contain removable rods, the frame is installed inside the cage, rings are mounted on the rods with the possibility of movement, and the hydrodynamic plates are connected to the net fabric of the cage by means of network plates. SEa. U Fig.d 1-1 FIG. 5Fig. In five Fy J fg. Fiesla S (6} Thebes.8 5IB)