Antarctic Krill Trawl Beam With Bidirectional Wing Plates
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Solution Overview
Problem
Existing beam trawls for euphausia superba fishing lack an active rising-diving adjustment mechanism, relying solely on vessel control of pulling rope length and speed to manage water depth, which is inadequate for precise fishing operations.
Innovation Solution
A metalimnion adjusting beam structure with bidirectional rotating wing plates driven by hydrodynamic generating mechanisms and a transmission system, allowing real-time depth adjustment and control through electromagnetic or solenoid control, integrated with a water depth sensor for precise trawl positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the trawl depth is controlled only by adjusting pulling rope length and vessel speed, then the control method is simple, but the depth adjustment is passive and imprecise
Solution Approach 1:
The patent applies the dynamics principle by transforming the static beam structure into a dynamic adjustable system. The beam incorporates rotating wing plates that can change their angle of attack actively, allowing the trawl depth to be dynamically adjusted in real-time based on fishing conditions, rather than being fixed or passively controlled only by rope length and vessel speed.
Solution Approach 2:
The patent implements parameter changes by modifying the angular parameter of the wing plates. By changing the rotation angle of the wing plates around the beam, the hydrodynamic forces acting on the beam are altered, which directly changes the trawl depth. This provides a precise control mechanism for depth adjustment independent of vessel speed or rope length.
2Ease of operation
If wing plates are added to enable active depth adjustment, then depth control precision is improved, but the device structure becomes more complex
Solution Approach 1:
The patent applies segmentation by dividing the beam into functional modules: the main beam structure, multiple independently rotatable wing plates, drive mechanisms for each wing plate, and control systems. This modular segmentation allows for easier manufacturing, maintenance, and adjustment of individual components without affecting the entire beam structure.
Solution Approach 2:
The wing plates serve multiple functions: they act as hydrodynamic surfaces to generate lift and control depth, serve as structural elements of the beam, and can be adjusted to different angles for various fishing conditions. This multi-functionality reduces the need for separate depth control mechanisms, thereby limiting the increase in overall device complexity.
3Adaptability or versatility
If bidirectional rotation of wing plates is implemented, then active rising and diving control is achieved, but the mechanism complexity increases
Solution Approach 1:
The patent introduces a transmission shaft as an intermediary component that connects the drive mechanisms to the wing plates. This transmission shaft enables the bidirectional rotation of wing plates by serving as a common rotational axis, simplifying the control architecture compared to having independent bidirectional mechanisms for each wing plate.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables active and precise control of beam trawl depth for effective euphausia superba tracking and fishing by adjusting the metalimnion, enhancing fishing efficiency and accuracy.
Implementation Method 1
the forward drive hydrodynamic generating mechanism and the reverse drive hydrodynamic generating mechanism are installed on the beam 1... When the forward drive hydrodynamic generating mechanism moves in a water body along with the beam 1, the forward impeller 8 can be driven to rotate in a forward direction through a hydrodynamic force
Implementation Method 2
the wing plates are driven to rotate around the center shaft of the transmission shaft, and the angle of the wing plates can be adjusted. Therefore, a direction of an acting force between the wing plates and water flow in a process of moving in a water body can be changed, and an effect of actively controlling the beam trawl to be up and down is achieved
Data Source
Figure 1~2
AI summary
The present invention relates to a metalimnion adjusting beam structure for a euphausia superba trawl, including a beam, a forward drive hydrodynamic generating mechanism, a reverse drive hydrodynamic generating mechanism, a transmission mechanism, and a rising-diving adjusting wing mechanism. The transmission mechanism includes a transmission shaft, the transmission shaft rotates in opposite directions respectively through non-synchronous drive of the forward drive hydrodynamic generating mechanism and the reverse drive hydrodynamic generating mechanism, the rising-diving adjusting wing mechanism includes installation plates, first gears and a wing plate with a shuttle-shaped cross section, the two first gears are respectively installed on opposite sides of the installation plates at equal heights and at interval, second gears are arranged on the transmission shaft, the second gears are located between the two first gears and synchronously mesh with the two first gears, the wing plate is installed between the installation plates, each end of the wing plate is connected with the two first gears, and an angle of the wing plate can be adjusted through rotation of an axis of the transmission shaft driven by reverse rotation of the two first gears. The present invention can realize controllable and active rising-diving adjustment of a beam trawl.