A 360-degree scanning sonar lifting device for fishing

Abstract

The invention relates to a 360-degree scanning sonar lifting device for fishing. A trunk is fixedly arranged at the bottom of a ship body; a sonar transducer is arranged at the inner part of the trunk; the upper part of the sonar transducer is linked to a main shaft; a screw rod is driven to rotate by a lifting driver of a vertical screw rod lifting device; the main shaft is driven to vertically move by a lifting frame provided with a screw rod nut; a driving gear is driven to rotate by a revolving driver of an accurate revolving device; the driving gear drives the main shaft to rotate through a driven gear; a revolving angle is fed back by a rotating encoder in a real-time manner so as to accurately controlling the revolving angle; the range of the revolving angle of the accurate revolving device is from minus 180 degree to 180 degree; the main shaft is a hollow shaft, and cables are arranged in the inner part of the main shaft so as to prevent the cables from being wound after rotating; an air-liquid sensor of an inflating balance system is arranged on the inner wall of the trunk, and the height of the air-liquid sensor is lower than that of a sealing ring between the main shaft and a lifting seat; a certain air pressure in the trunk is maintained by the inflating balance system, so that the height of a liquid level in the trunk is lower than that of the air-liquid sensor; when the height of the liquid surface is equal to that of the air-liquid sensor, the inflating balance system increases an air supply air pressure.

Description

technical field [0001] The invention relates to a 360-degree scanning sonar lifting device for fishing, which belongs to the technical field of fishery instruments. Background technique [0002] During World War II, submarine destroyers equipped with military sonar sometimes mistook fish schools for submarines to attack, which aroused people's interest in sonar fish detection. After the war, some countries borrowed warships equipped with sonar to conduct fish detection research. In the early 1950s, Norway began to build a single-beam mechanical scanning sonar specially used for fish detection; in the 1960s, sonar has become an important equipment on seiners and mid-level trawlers. China began to develop single-beam fishing sonar in the 1960s, and developed multi-beam electronic scanning sonar in the 1970s, and equipped it on seine fishing boats. Fishing sonar consists of a transmitter, receiver, terminal display, transducer array, etc. Its working principle is similar to t...

AI Technical Summary

Problems solved by technology

This form of detection requires multiple sets of sonar transducers, which are costly and are too large to be installed at the bottom of the hull, increasing navigation resistance, increasing energy consumption, and poor economy

At the same time, when the existing fishery sonar realizes the lifting function, it will inevitably cause seawater to enter the bearing, which requires high sealing of the bearing, which increases the cost and reduces the reliability.

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