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当前,群众渔业小型渔轮的拖网网具,已实现了四个大转变,一是由底层拖网向中层、变水层拖网转变;二是网目由小网目向特大网目转变,达到了10—13m;三是网型由小型向大型转变,达到500—700m;四是拖速由低速向快速转变。从而实现了“大网快拖”,以适应捕捞中、上层鱼类的需要。 一、四片—二片式双船变水层拖网的设计要点 1、网口周长和网目大小的关系: 主机功率为150KW的钢质渔船,根据我们所设计的目大为1—8m的四片式拖网有关数据,应用数理统计方法,当拖速要求3.8—4节时,网口周长和网目大小的关系为C=197.697L~(0.255) 式中:C—网口周长(m) L—网目尺寸(m) 按此公式计算,150KW的钢质渔船,当网目为8m时,计算得C=335.96m。 2、网口周长和主机功率的关系:
At present, the trawlers for the small fishing vessels of the mass fisheries have achieved four major changes. One is the trawling from the bottom to the middle and the change of water traps. The other is the shift of the net from small nets to extra large nets, reaching 10 -13m; Third, the net from small to large changes, reaching 500-700m; Fourth drag speed from low to fast changes. So as to achieve the “big net quick drag” to meet the fishing, the needs of the upper fish. One, four - two-piece double-deck aqueduct trawl design points 1, the network port circumference and mesh size of the relationship: the host power of 150KW steel fishing boat, according to our design is greatly large 1-8m Of the four trawl-related data, the application of mathematical statistics, when the drag-speed requirements 3.8-4 section, the network port circumference and the size of the relationship between the mesh C = 197.697L ~ (0.255) Where: C- Length (m) L-mesh size (m) According to this formula, 150KW steel fishing vessels, when the mesh is 8m, calculated C = 335.96m. 2, network port circumference and host power relationship: