• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    A pelagic or semi-pelagic trawl bucket according to the invention has an upper part (3) and a lower part (4) which 1 are mutually joined with a side angle a in relation to each other viewed along a main plane P which extends substantially in trawl forest. - total height H and average length B. The parts of the trawl bucket (3, 4) each have leading edges (11, 12) located at the front of the trawl bucket in the position of use. What is special about the trawl bucket is that its upper portion (3) and lower portion (4), viewed in a direction perpendicular to the main plane P, are at a front angle beta relative to each other such that the trawl bucket takes arrowhead shape. The leading edges (11 and 12) form a vertex (10), from which the leading edges (11, 12) of the upper part (3) and the lower part (4) extend upwards and backwards, respectively downwards and backwards, in the operating position during fishing. Thereby, a reduced height of the trawl bucket is obtained without at least its H: B ratio, and at the same time a greater stability of the trawl bucket is obtained when used close to the seabed, the angle between the leading edge having a self-creating effect if the lower edge of the trawl bucket hits the seafloor.
    公开号:DK201500026U1
    申请号:DK201500026U
    申请日:2015-02-19
    公开日:2015-02-27
    发明作者:Andreasen Peder Stausholm
    申请人:Thyborøn Skibssmedie As；
    IPC主号:
    专利说明:

    FIELD OF THE INVENTION
    The present invention relates to a trawl bucket for pelagic and semipelagic fishing of the type commonly referred to in the industry as a curved V bucket.
    BACKGROUND OF THE INVENTION
    Trawl blades, whose total height is greater than the length of the trawl bucket considered in the trawl bucket's use during fishing, are well known in the art. Such trawl blades have an upper portion and a lower portion, each comprising one, preferably several, curved plate portions. The upper portion and the lower portion are interconnected such that the portions form a side angle relative to each other viewed along a principal plane extending substantially in the height and length of the trawl vane. The upper and lower portions of the trawl bucket each have leading edges that are in the front of the trawl bucket in the upright position, or trailing edges, which are at the rear of the trawl bucket in the upright position. Such a trawl bucket is described in EP 1 819 218.
    The lateral angle, which usually appears as a longitudinal crack in the middle of the trawl bucket, is provided to increase the trawl bucket's stability in the water relative to the main plane.
    The playing power of a trawl bucket, ie. the force by which a pair of trawl vanes can disperse the mouth of a trawl net depends on the area of the vane affected by the overflowing seawater; this hydrodynamic area is dependent on the area of the bucket projected on the main plane.
    The efficiency of a trawl bucket depends to a large extent on its overall aspect ratio, understood as the ratio of total height divided by width, H: B, the width here and in the following being the length of the trawl bucket. The greater the H: B, the better the playing power is obtained in relation to the drag resistance of the trawl bucket in the water. For pelagic trawl blades, therefore, one seeks to maximize H: B, where the limit of this size depends to some extent on practical conditions, as very high trawl blades can be difficult to handle on ships.
    Therefore, there has been a practical limit to how large the H: B ratio can be on a trawl bucket with a given nominal area. To some extent, the playing power can be increased by other means, such as using multiple curved plates, in English foils which extend in the height of the trawl vane, which have an approximate wing profile and which partially overlap, but for such means there is also a limit.
    Furthermore, in recent years there has been a greater tendency for pelagic trawl blades to be used close to the seabed, with the lower part of the trawl blades sometimes hitting the seabed. This can cause the trawl bucket to tilt so much that it loses balance in the water, perhaps without being able to straighten itself, so that fishing must be temporarily suspended.
    The object of the invention
    An object of the invention is to provide a trawl bucket which, at a given nominal area and efficiency, has less height. Another object of the invention is to provide a trawl vane which has an increased stability relative to a horizontal axis perpendicular to the feed direction.
    Description of the Invention
    These and other objects are achieved by a trawl bucket of the type indicated in the beginning, where it is special that the upper and lower parts of the trawl bucket, viewed in a direction perpendicular to the main plane, are at a front angle with respect to each other such that the leading edges of the upper and lower levers are respectively. lower parts where the parts are assembled form a vertex from which the leading edges of the upper and lower parts extend upwards and backwards respectively downwards and backwards in the position of use during fishing, where the leading edges of the upper and lower parts of the trawl bucket are respectively equal least in the region at the apex and that the front angle β has a size in the range of 20 ° to 50 °, measured as the angular deviation between the two leading edges.
    This makes it possible to reduce the total height of a trawl bucket while maintaining a given nominal area and a given H: B ratio. At the same time, this delta or arrow shape of the trawl bucket will increase its stability during fishing by impacts on the trawl bucket's upper or lower leading edges, the angular shape of the trailing bucket's front edge in the feed direction will have a self-creating effect. If the trawl is used in semi-pelagic fishing, ie. close to the seabed, and the bottom edge of the trawl bucket strikes the bottom or rocks or rock formations on the seafloor, the trawl bucket will tip forward due to the pull of the trawler's wires. Thereby, the lower leading edge will lie down and closer to the seabed more closely than if the entire leading edge of the trawl bucket was straight, as on known trawl buoys. Thus, the trawl bucket according to the invention will be facilitated by sliding off on the seabed or on the rock or other obstacle that the lower edge strikes. At the same time as the trawl bucket is tilting forward, the upper leading edge of the trawl bucket will be raised from a slightly backward sloping position to a more vertical position in the water, thereby increasing the water resistance on the upper portion of the trawl bucket, which creates an establishing moment about an axis perpendicular to the main plane. and contrary to the tilting motion, so that the trawler according to the invention can more easily return to its normal position during fishing.
    The upper and lower parts of the trawl bucket may be of different sizes; it is preferred that the parts be the same or approximately the same size. Optionally, the trawl bucket can be extended in the height direction by retrofitting the extension pieces on one or both.
    It is preferred that the leading and trailing edges of the upper and lower parts of the trawl bucket of the invention, respectively, are straight and parallel so as to obtain the greatest possible hydrodynamic area. However, it is possible within the scope of the invention to design the trawl bucket with non-parallel front and rear edges of the upper and lower parts, e.g. so that the upper and lower part are pointed towards the upper and lower edges respectively.
    It is preferred that the apex at the point of assembly of the leading edges is a point which forms a tip. Other designs are possible where the point of intersection at the leading edges between the upper and lower parts is rounded or is a straight piece forming an angle with both the upper and lower leading edges.
    It is possible to have different courses of leading edges of the upper and lower parts, e.g. curving backwards from the apex, just as it is possible that the front angle varies. It is preferred by the trawl blade according to the invention that the leading edges of the upper and lower parts of the trawl blade, respectively, are at least in the region at the apex, and that the front angle β has a size in the range of 20 ° to 50 °, and most preferably is a front angle of range 30 ° to 40 °, measured as the angular deviation between the two leading edges. The larger the front angle, the smaller the total height of the trawl blade.
    In the trawl vane of the invention, a lateral angle which is in the range of 155 ° to 165 ° is preferred.
    To achieve a high efficiency, ie. an advantageous ratio of water resistance to play force, it is preferred that the ratio of the total height H of the trawl bucket to its length B measured as an average of the leading edge and the trailing edge perpendicular to the height H is at least 2.5. It is preferred that the H: B ratio be at least 2.8. In other embodiments, the H: B ratio may be 3.0 or greater, e.g. 3.5 or 4.0.
    drawing Description
    An embodiment of the invention will now be described with reference to the drawing, in which 1 shows a trawl bucket according to the invention seen from the inside and perpendicular to a main plane of the trawl bucket; FIG. 2 shows the trawl bucket of FIG. 1 taken along line II-II of FIG. 1, FIG. 3 shows a section along line III-III in FIG. 2, FIG. 4 shows the trawl vane seen from above in FIG. 2 in the direction of arrow IV, and FIG. 5 shows the same as FIG. 4, but in the direction of the arrow V.
    Description of Embodiments of the Invention In the specific embodiment of the invention, a trawl bucket is shown in FIG. 1 and 2 approximately as it will be in use, i. when used during trawl fishing, the inside of the trawl bucket as seen in FIG. 1, faces an area in front of the trawl net. On the inside 1 the wires shown are not attached to the trawler and on the outside 2 the wires are attached to the trawl net.
    In the illustrated embodiment, the trawl bucket is made up of an upper portion 3 and a lower portion 4 which are joined at the center of the trawl bucket in a known manner by welding to a longitudinal plate spacer 5, which also has eyes 6 for securing wires. The free end of the upper part 5 is terminated with a top plate 7 and correspondingly the free end of the lower part 4 is completed with a bottom plate 8. Top plate 7 and bottom plate 8 have in known manner fastening eyes 6a for the wires for the trawl net.
    In the example shown for the trawl bucket according to the invention, the parts 3 and 4 are designed as mirror images of each other, with the same dimensions and almost the same design, the top and bottom plates 7, 8 being different.
    Between the plate piece 5 and top plate 7 and base plate 8, respectively, in a known manner extends a series of curved plate elements 9a, 9b, 9c, 9d, also called foils, which form flow channels between them. Elements 9a-9d form the area affected by the by-flow water, which area is the nominal measure of the size of the trawl bucket.
    The trawl bucket is further known in the known manner with a crack in the joint between parts 3, 4, the upper and lower parts mutually forming a blunt side angle a, see fig. 2 is a front view of the trawl bucket along the main plane indicated by P in FIG. 2. This angle is here between 157 and 160 °, but may vary outside this range.
    What is special about the trawl bucket is that the parts 3 and 4 are also arranged at a different angle β, the front angle, so that the trawl bucket forms a delta or arrowhead contour seen from the side and perpendicular to the main plane P, as shown in fig. 1. In the embodiment shown, the upper part 3 and the lower part 4 form a vertex 10 which coincides with the front part of the edge of the sheet metal 5. From the vertex 10, the leading edges 11 and 12 slope rearwardly and upwards and downwardly on the upper part, respectively. part 3 and the lower part 4.
    The front angle β is shown in FIG. 1, measured as the deviation of the leading edge of the upper part 3 from the leading edge of the lower part 4. The front angle β will typically, but not exclusively, be in the range 20 ° to 50 °. It is preferred that the front angle is between 30 ° and 40 °.
    The plate elements 9a - 9d are formed so that they extend parallel to each other and so that their spacing is the same between the plate piece 5 and the top and bottom plate 7, 8.
    According to the invention, the total height H of the trawler will be reduced so that it fills less during handling on a trawler. The H: B ratio can thereby also remain the same, although the length B measured as shown in FIG. 1, and thus the nominal area is kept constant. Conversely, the invention can be used to increase the H: B ratio and thus the efficiency of a trawl bucket with given area and given length B.
    In the embodiment shown, the H: B ratio is approx. 2.85. Greater or smaller H: B ratios are possible, depending on the task that the trawl bucket has to solve.
    In the embodiment shown, the trailing edges 13, 14 are respectively upper portion 3 and lower portion 4 parallel to leading edges 11 and 12. Other non-parallel designs are of course possible within the scope of the invention.
    It should be noted that parts 3 and 4 do not necessarily have to consist of four foils, as there may be fewer or more. Furthermore, the parts 3, 4 may comprise other than plates, e.g. elements with wing profile cross sections.
    权利要求:
    Claims (8)
    [1]
    A trawl bucket whose total height is greater than the trawl bucket length considered in the trawl bucket's operating position when fishing with the trawl bucket, wherein the trawl bucket has an upper portion and a lower portion, each comprising one, preferably several curved plate portions, the upper portion and the lower portion are joined together such that the portions form a side angle α with respect to each other viewed along a principal plane extending substantially in the height and length of the trawl vane, the upper and lower portions of the trawl vane each having leading edges located at the front of the trawl vane in the position of use, or trailing edges, respectively, located at the rear of the trawl bucket in the position of use, characterized in that the upper and lower parts of the trawl bucket, viewed in a direction perpendicular to the main plane, are at a front angle β relative to each other such that the leading edges of the upper and lower lower parts where the parts are assembled form a vertex from which the leading edges of the upper and lower parts extend r upwards and backwards, respectively, downwards and backwards in the position of use during fishing, where the leading edges of the upper and lower parts of the trawl bucket, respectively, are at least in the region at the apex and the front angle β has a size in the range 20 ° to 50 °, measured as the angular deviation between the two leading edges.
    [2]
    A trawl bucket according to claim 1, wherein the leading and trailing edges of the upper and lower parts of the trawl bucket, respectively, are straight and parallel.
    [3]
    A trawl bucket according to claim 1 or 2, wherein the apex at the assembly point of the leading edges forms a tip.
    [4]
    A trawl bucket according to claim 1, wherein the front angle size is in the range of 30 ° to 40 °.
    [5]
    A trawl bucket according to any one of the preceding claims, wherein the α angle of the side angle is in the range of 155 ° to 165 °.
    [6]
    Trawl bucket according to any one of the preceding claims, wherein the ratio of the total height H of the trawl bucket to its length B measured as an average between the leading edge and the trailing edge perpendicular to the height H is at least 2.5.
    [7]
    7. Trawl bucket according to claim 6, wherein the ratio of the total height H of the trawl bucket to its length B measured as an average between the leading edge and the trailing edge perpendicular to the height H is at least 2.8.
    [8]
    Trawl bucket according to claim 6 or 7, wherein the ratio of the total height H of the trawl bucket to its length B measured as an average between the leading edge and the trailing edge perpendicular to the height H is in the range of 3.0 to 4.0.
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    同族专利:
    公开号 | 公开日
    DK201500026Y3|2015-03-27|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    WO2020084643A1|2018-10-26|2020-04-30|Ny Toghlerahonnun Ehf.|Connection for a trawl door|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    DK201500026U|DK201500026Y3|2015-02-19|2015-02-19|trawl door|
    DK201500026|2015-02-19|DK201500026U| DK201500026Y3|2015-02-19|2015-02-19|trawl door|
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