DD267898A1 - TOWING NET WITH LARGE BEATING WIDTH - Google Patents

Abstract

The invention relates to a trawl for catching ground-catching fish objects, which is equipped by special section of the bottom sheet and, this upstream roller frame are guided by the sub-forces on discharge level to the apex, whereby a higher proportional rolling friction of the roller frame is achieved.

Description

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Field of application of the invention

The invention relates to a trawl net with large fishing width, equipped with a roller frame for industrial fishing, which is characterized by a low wear of the lower sheet and the reel harness.

Character! »Tik of the known technical solutions Trawls are known for catching down-to-earth catching fish, which help to reduce network damage Rolling harnesses are provided. Such roller harnesses run in working position in front of the parabolic opening base rope. They consist of individual items raised on stands or chains, such as ground balls and Klutjes, the stander

or chains form the axes of these elements. In addition to the hydrodynamic

Forces ground forces. Soil forces and hydrodynamic «. Forces overlap, with ground forces acting as friction forces

can be understood. Since the weight of the reel harness at the same time as Beschworungsgewicht for the respective

Trawl, the proportion of reel crockery resistance at trawl drag is considerable, as practical

Only in the apex of the parabola (axis position 90 "opposite to the direction of movement) elements connected with pure resistance [have all other elements predominantly sliding resistance.

When commercial nets are used in industrial fishing, reel weights of up to 180OK ^ are used, which are about Va des

total network resistance. These forces must be equalized by correspondingly large shear forces in order to achieve sufficiently large Befischungsbreiten. In addition, the elements used are due to the high Antoil on

Sliding friction exposed to extreme wear. Trawls without the use of a roller frame are very susceptible to damage in the lower sheet. It has been proposed (DD180730) to veuichten on a roll rack and the subnetwork from a Koinbinatio.i

of chains which in tow direction the parabolic section of the Gruntau connect with the

Produce mains cone. However, this construction does not lift the subnet on particularly heavy ground ratios

sufficiently far away from the ground to avoid damage during subsidence, besides there is a reduction in catch in the area of the missing one

Netting on, the resting chains have pure sliding friction. The wider fishing widths are widened by the use of adjacent nets System of 2 towed vehicles are used, or about relief stand in the Einzugsbe the trawl

lie (FR 579936, SU 3140) are so connected to the Vorirrirr that in the end resumed parabolic

Basic dew processes are present. A use of external constructions without Roilen racks on bad conditions is without Damage to the lower sheet area is not possible. The additional spreader lines exert a negative Scheuch effect, since

they lie in the catchment area of the trawl net.

In (DD 200004) the large net opening width is to be arranged by two on a common head line Trawl cones passing through the apex of the head leash and parabolae

a vertical connecting wedge are connected. The gain in net opening width is proven in practice, but results in flour from the reduction of the resistance resulting from the reel harness, but from the lower

Share of netting of the network cones. The vertical web in the gusset is prone to damage and requires the training of Side wedges in the rehabilitation area. Object of the invention

The invention is based on the object, in exploitation of the least expensive Netzkonstruktionsiorm, to achieve a reduction of the reel resistance and to find a trawl and associated equipment, which achieves greater Befischungsbreiten while reducing the wear of fishing harness elements, while retaining spreading forces used.

Explanation of the essence of the invention

According to the invention, this object is achieved in that the roller frame by additional means a »deviating in working position of a parabola adjustment is achieved, the same transferred from the sliding friction in a rolling friction.

It has been found that in a cut of the lower leaf at Grundtauverlauf In individual; <arebelförmige sections before which is arranged in the same course 6in Rollengestoll, and by attaching krafteaufneendenden elements are guided to the wing tip of the roller frame while maintaining the same thrust forces, a larger Befischungsfläche is realized, resulting from the reduction of the proportionate sliding resistance of the reel harness 1.

When executing the ki äfteaufnehmenden elements as a resting on the ground chain, this serves as a catch positively influencing Scheuch element. In this case, a relatively short lower-leaf section advantageously opens into two network cones arranged next to one another. The opening height is realized by a broken headline. The two power cones are made of two lobes tnci ι .. «. Inem common point with dom upstream Dachstück of the upper leaf and dorr Unterblatt connected, eliminating the use of side wedges.

embodiment

The invention will be explained below using an exemplary embodiment. Fig. 1 - shows an isometric view of the trawl according to the invention with an embodiment of the bottom sheet in individual arcuate sections 4, in front of which a roller frame δ is arranged, are led from the tips of relief stand 1 to the roller table top, the net opening height is realized by a common head line 3 and whose roof piece opens into two nets, connect it to the underside 4 on the inside at a crossing point 2.

Claims (3)

1. Trawl with large Befischungsbreite, characterized in that the lower sheet (4) is divided into several parabolic sections which are angoordnet over the Bofischungsbreite side by side or side by side angoordnet. 2. Trawl according to claim 1, characterized gekonnzeichnet that the roller frame (5) is connected to the tips of the individual segments by relief stand (1) with the wing tips. 3. Trawl according to claim 1 and 2, characterized in that a common bottom sheet opens into two two-lobed net cone, at a common crossing point (2) both on the lower sheet (4) as search on the of a common head line (3) carried over sheet begin.