CN109997805B

CN109997805B - Trawl cod end mesh form change sensor

Info

Publication number: CN109997805B
Application number: CN201910378967.6A
Authority: CN
Inventors: 杨炳忠
Original assignee: South China Sea Fisheries Research Institute Chinese Academy Fishery Sciences
Current assignee: South China Sea Fisheries Research Institute Chinese Academy Fishery Sciences
Priority date: 2019-05-08
Filing date: 2019-05-08
Publication date: 2021-09-21
Anticipated expiration: 2039-05-08
Also published as: CN109997805A

Abstract

The invention discloses a trawl sac mesh form change sensor, which comprises: the device comprises a trawl and a sensing assembly arranged on the trawl; the sensing assembly comprises telescopic rods arranged in a crossed manner and inductors arranged at two ends of each telescopic rod; an angle instrument is arranged at the joint of the telescopic rod, and the telescopic rod is a flexible piece; the inductor is fixed on the mesh node, and when the trawl volume changes, the length ratio of the two telescopic rods on the same mesh changes.

Description

Trawl cod end mesh form change sensor

Technical Field

The invention relates to a sensor, in particular to a trawl sac mesh form change sensor.

Background

The trawl is an active fishing gear, and the trawling operation of a fishing boat is utilized to force fish, shrimps, crabs, shellfish and other species in the water area to enter the trawl, thereby achieving the purpose of fishing production. Among 12 kinds of fishing gear, the trawl net has the highest fishing efficiency and the largest yield. With the exhaustion of offshore fishery resources, trawl fishery also has some problems which need to be solved urgently. Such as: the trawl net bag has poor selectivity and high juvenile fish ratio of the catch. Meanwhile, in order to improve the net output, fishermen often increase the time of each net operation, so that a part of the fishery catch is extruded and the quality is reduced. In addition, disaster-causing organisms such as jellyfishes often explode in fishing grounds for trawling work due to global climate change. Due to the large amount and large volume of the erupted jellyfishes, the structure of the trawl is easily damaged. The real-time monitoring of the volume of the catch can reduce the risk of breaking the trawl. Meanwhile, the volume of the catch is also a factor influencing the selectivity of the net sac. However, no technology is available to measure the volume of the fish catch in real time at present due to the influence of water flow and other factors in the trawling operation process.

Disclosure of Invention

The invention overcomes the defects of the prior art and provides a trawl sac mesh form change sensor.

In order to achieve the purpose, the invention adopts the technical scheme that: a trawl sac mesh morphology change sensor, comprising: the device comprises a trawl and a plurality of sensing assemblies arranged on the trawl; the sensing assembly comprises telescopic rods arranged in a crossed manner and inductors arranged at two ends of each telescopic rod; an angle instrument is arranged at the joint of the telescopic rod, and the telescopic rod is a flexible piece; the inductor is fixed on the mesh node of the trawl, and when the volume of the trawl changes, the length ratio of the two telescopic rods on the same mesh changes.

In a preferred embodiment of the present invention, the sensing assembly further comprises a data transmission unit, and the data transmission unit can transmit the data detected by the sensor to a computer.

In a preferred embodiment of the present invention, the sensor is a snap-in structure.

In a preferred embodiment of the present invention, the telescopic rod is a socket structure.

In a preferred embodiment of the invention, the angle gauge is capable of detecting the angle between two telescopic rods in cross connection.

In a preferred embodiment of the invention, the length of the telescopic rod can be reset when the trawl volume is reduced.

In a preferred embodiment of the invention, a plurality of the sensing assemblies are symmetrically distributed on the outer side of the trawl.

In a preferred embodiment of the present invention, the sensor is a displacement sensor.

The invention solves the defects in the background technology, and has the following beneficial effects:

(1) when the weight of the fishing object changes, the length ratio of the two telescopic rods changes, and the sensors at the two ends of the telescopic rods detect the telescopic amount of the telescopic rods to detect the mesh shape, so that the selectivity of the trawl is improved.

(2) The inductor is buckle structure, with the inductor joint on the node of mesh, can make the accurate length that detects the telescopic link between the mesh diagonal of inductor, can not make any one of them inductor drop, causes telescopic link length to detect production error, and measurement accuracy is higher.

(3) After the catch is poured out from the trawl, the telescopic rod on the mesh form change sensor can reset, so that the mesh returns to the initial form, the initial form is used as a reference, the mesh form can be used as a reference standard after being changed, the change of the mesh form is detected, and by the mode, the data comparison is more accurately obtained.

(4) When the trawl rotates and twists, the torsion angle of the mesh can be measured through the angle meter at the joint of the telescopic rod, and the reference quantity of the torsion degree is increased, so that the relative form change of the mesh in comparison with the initial state can be detected when the mesh is not on the same plane, and the measurement precision is high.

Drawings

The invention is further explained below with reference to the figures and examples;

FIG. 1 is a partial perspective block diagram of a preferred embodiment of the present invention;

FIG. 2 is a schematic side view of a preferred embodiment of the present invention;

in the figure: 1. a telescopic rod; 2. an angle gauge; 3. a clamping block; 4. an inductor; 5. a probe; 6. a card slot; .

Detailed Description

The invention will now be described in further detail with reference to the accompanying drawings and examples, which are simplified schematic drawings and illustrate only the basic structure of the invention in a schematic manner, and thus show only the constituents relevant to the invention.

As shown in fig. 1-2, a trawl sac mesh morphology change sensor includes: the sensor comprises a trawl and a plurality of sensing components arranged on the trawl;

the sensing assembly comprises telescopic rods 1 which are arranged in a crossed mode and inductors 4 which are arranged at two ends of each telescopic rod 1; an angle instrument 2 is arranged at the joint of the telescopic rod 1, and the telescopic rod 1 is a flexible piece; inductor 4 is fixed on trawl mesh node, and when the trawl volume changes, the length ratio of two telescopic links 1 on the same mesh changes.

The sensing assembly further comprises a data transmission unit which can transmit the data detected by the sensor 4 to a computer, and can remotely analyze the data transmitted by the data transmission unit through the computer, thereby performing data comparison and analyzing the change of the mesh shape.

Inductor 4 is buckle formula structure, 4 tip of inductor is provided with fixture block 3, it still is provided with the draw-in groove 6 that corresponds fast with the card to correspond the position on telescopic link 1, when the joint of inductor 4 is on the node of mesh, the card just blocks into in draw-in groove 6 soon, make fixing that the form change sensor can be firm on dragging the net, there is probe 5 on the inductor 4, with the joint of inductor 4 on the node of mesh, can make the accurate length that detects telescopic link 1 between the mesh diagonal of inductor 4, can not make wherein arbitrary inductor 4 drop, cause 1 length detection of telescopic link to produce the error, measurement accuracy is higher.

The telescopic link 1 is the cup joint structure, and the telescopic link 1 of cross arrangement is when the weight of the catch thing changes, and the length ratio of two telescopic links 1 changes, and the inductor 4 at 1 both ends of telescopic link detects the flexible volume of telescopic link 1, carries out the detection of mesh form to improve the selectivity of trawl.

Angle appearance 2 can detect the angle between two telescopic links 1 of cross connection, when the rotatory distortion of trawl, the angle appearance 2 through the 1 junction of telescopic link can measure the torsion angle of mesh, increases this reference volume of torsion degree for the mesh is not when the coplanar, can detect out the relative morphological change of mesh contrast initial condition equally, and measurement accuracy is higher.

When the trawl volume reduces, 1 length of telescopic link can reset, a plurality of sensing element symmetric distribution is in the trawl outside, and inductor 4 is displacement sensor, in other words, after the catch thing is poured out from the trawl, telescopic link 1 on the mesh form change sensor can reset, makes the mesh reply initial form, as the reference through initial form, after the mesh form changes, can regard as the reference standard, detect the change of mesh form, through this mode, more accurate reachs the data contrast.

In light of the foregoing description of the preferred embodiment of the present invention, it is to be understood that various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.

Claims

1. A trawl sac mesh morphology change sensor, comprising: the device comprises a trawl and a plurality of sensing assemblies arranged on the trawl; the device is characterized in that the sensing assembly comprises telescopic rods arranged in a crossed manner and inductors arranged at two ends of the telescopic rods;

an angle instrument is arranged at the joint of the telescopic rod, and the telescopic rod is a flexible piece;

the sensor is fixed on a mesh node of the trawl, and when the volume of the trawl changes, the length ratio of the two telescopic rods on the same mesh changes;

the sensing assembly further comprises a data transmission unit, and the data transmission unit can transmit data detected by the sensor to a computer;

the sensor is a displacement sensor.

2. The trawl sac mesh morphology change sensor according to claim 1, wherein: the inductor is of a buckle type structure.

3. The trawl sac mesh morphology change sensor according to claim 1, wherein: the telescopic rod is of a sleeving structure.

4. The trawl sac mesh morphology change sensor according to claim 1, wherein: the angle gauge can detect the angle between two telescopic rods in cross connection.

5. The trawl sac mesh morphology change sensor according to claim 1, wherein: when the trawl volume is reduced, the telescopic rod length can reset.

6. The trawl sac mesh morphology change sensor according to claim 1, wherein: the plurality of sensing assemblies are symmetrically distributed on the outer side of the trawl.