Settler for sampling net and sampling system

Abstract

The invention discloses a settler for a sampling net, which comprises a curved-surface settling bottom plate with a concave surface; the first mounting plate and the second mounting plate are respectively arranged at two ends of the curved surface settlement bottom plate; the first supporting plate and the second supporting plate are arranged on the concave surface of the curved surface settlement bottom plate at an interval; the two ends of the connecting rod are fixed to the first mounting plate and the second mounting plate respectively, the connecting rod penetrates through the first supporting plate and the second supporting plate, the curved surface settlement bottom plate comprises a first arc-shaped plate, a second arc-shaped plate and a third arc-shaped plate, and the first arc-shaped plate, the second arc-shaped plate and the third arc-shaped plate are fixed in sequence to form the curved surface settlement bottom plate.

Description

Technical Field

[0001] The present invention relates to the technical field of sampling net systems, and particularly to a settler and a sampling system for quantitatively sampling fish eggs, larvae and juveniles using a sampling net. Background Art

[0002] Quantitative sampling surveys of fish eggs, larvae and juveniles are key means for evaluating the current status of fishery resources, clarifying resource replenishment mechanisms and achieving sustainable utilization of fishery resources. The sampling net system usually consists of a net and a settler. The settler provides a stable sinking force to enable the net to be towed at a constant water layer. To maintain a constant water layer, the ratio of the sinking force to the horizontal resistance (sinking resistance ratio) of the settler needs to be stable, which poses strict requirements on the hydrodynamic performance of the settler.

[0003] Early settlers used heavy rods or rectangular planar structures, which relied on their own weight or planar resistance to provide sinking force, but had poor hydrodynamic performance: heavy rods significantly increased the total weight of the system, while the sinking resistance ratio of the rectangular planar structure was usually less than 1.5, and the single-side wire connection method easily caused the angle of attack to change with the towing speed, resulting in the deviation of the working water layer of the net. The subsequent improved "V-shaped planar" settler is composed of two flat plates connected at a fixed angle, and the sinking resistance ratio is increased to 1.5 - 2.0, but the sinking force coefficient is still low (0.8 - 1.2), and the angle of attack stability is insufficient. The further optimized "V-shaped curved surface" settler increases the sinking resistance ratio to 2.5 - 3.0 through the design of the curved plate, but the curved surface structure is difficult to fold, the storage area occupied on the deck after operation increases significantly, and a special bracket is required for fixation, with complex operation and low disassembly and assembly efficiency.

[0004] In the prior art, the planar structure settler is difficult to meet the high-precision sampling requirements due to insufficient sinking force, while the curved surface structure settler, although improving the performance, limits the practical application due to large space occupation and cumbersome operation. Therefore, there is an urgent need for a new type of settler with both high hydrodynamic performance, compact structure and convenient operation to solve the contradiction between sinking force stability and operation convenience, and improve the operation efficiency and data reliability of the sampling net. Summary of the Invention

[0005] In some embodiments, the present invention provides a settler for a sampling net, including: a curved surface settling bottom plate with a concave surface; a first mounting plate and a second mounting plate respectively arranged at two ends of the curved surface settling bottom plate; a first support plate and a second support plate spaced apart on the concave surface of the curved surface settling bottom plate; and at least one connecting rod with two ends respectively fixed on the first mounting plate and the second mounting plate and passing through the first support plate and the second support plate, wherein the curved surface settling bottom plate includes a first arc plate, a second arc plate and a third arc plate, and the first arc plate, the second arc plate and the third arc plate are fixedly connected in sequence to form the curved surface settling bottom plate.

[0006] In some embodiments, the curvature of the first arc plate, the second arc plate and the third arc plate is all 15%.

[0007] In some embodiments, the first support plate includes a first arc edge, forming a first convex circular arc with a radius of R, and the curvature of the first convex circular arc is 15%, so as to fit and fix with the curved settlement bottom plate; the second support plate includes a second arc edge, forming a second convex circular arc with a radius of R, and the curvature of the second convex circular arc is 15%, so as to fit and fix with the curved settlement bottom plate.

[0008] In some embodiments, the distance between the first support plate and the first mounting plate is 820 mm, the distance between the second support plate and the second mounting plate is 820 mm, and the distance between the first support plate and the second support plate is 800 mm.

[0009] In some embodiments, the included angle between the first arc plate and the second arc plate is 20°; the included angle between the second arc plate and the third arc plate is 20°.

[0010] In some embodiments, the diameter of at least one connecting rod is 18 mm, and the two ends are respectively fixed to the upper parts of the first mounting plate and the second mounting plate, and the connecting rod is fixedly welded to the first mounting plate, the second mounting plate, the first support plate and the second support plate.

[0011] In some embodiments, the sedimentation device for sampling net provided by the present invention further includes: at least two groups of suspension rings, which are respectively arranged on the tops of the first mounting plate and the second mounting plate.

[0012] In some embodiments, the sedimentation device for sampling net provided by the present invention further includes: reinforcing steel bars, which are fixedly arranged along the edges of the first arc plate, the second arc plate and the third arc plate.

[0013] In some embodiments, the present invention provides a sampling system, including: a sampling net, including a net mouth frame; a sedimentation plate, arranged on the sampling net; the sedimentation device for sampling net according to any one of the above, and the sedimentation device for sampling net is connected to the sedimentation plate through a steel cable.

[0014] In some embodiments, the suspension ring is detachably connected to the net mouth frame of the sampling net, and the connection angle is adjustable, so that the working attack angle of the sedimentation device for sampling net is 20° - 30°.

[0015] The sedimentation device for sampling net according to some embodiments of the present invention can bring beneficial technical effects. For example, the sedimentation device for sampling net provided by the present invention significantly optimizes the hydrodynamic performance and operation convenience through the collaborative design of the curved sedimentation bottom plate, the support plate and the connecting rod. The sedimentation device for sampling net provided by the present invention includes a curved sedimentation bottom plate formed by sequentially fixing a first arc plate, a second arc plate and a third arc plate, the concave curvature of which is 15% and the included angle between adjacent arc plates is 20°. When the optimal working attack angle is 25°, the sedimentation coefficient reaches 1.679 and the drag coefficient is 0.556, and the sedimentation-drag ratio is increased to 3.02, which is nearly 100% higher than the sedimentation performance of the traditional "V-shaped plane" sedimentation device, and the volatility of the sedimentation-drag ratio is less than 5% in the range of towing speed of 0.5 - 3.0 m / s; the first support plate and the second support plate are arranged at intervals on the concave surface and are rigidly connected with the connecting rod passing through them. Combining the symmetrical layout of the first mounting plate and the second mounting plate, the structural deformation amount is reduced, and the service life is extended by about twice compared with the prior art. In addition, the structural design of the curved sedimentation bottom plate can reduce the storage space on the deck, and at the same time reduce the overall weight, which is convenient for disassembly, handling, and the towing energy consumption is also reduced, providing stable support for high-precision water layer sampling. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the present invention will be briefly introduced below. It can be understood that these drawings are only exemplary and do not constitute any limitation to the embodiments of the present invention.

[0017] Figure 1 FIG. shows a schematic structural diagram of a sedimentation device for sampling net according to some embodiments of the present invention;

[0018] Figure 2 FIG. shows a front view of a sedimentation device for sampling net according to some embodiments of the present invention;

[0019] Figure 3 FIG. shows a top view of a sedimentation device for sampling net according to some embodiments of the present invention;

[0020] Figure 4 FIG. shows a side view of a sedimentation device for sampling net according to some embodiments of the present invention;

[0021] Figure 5 FIG. shows a schematic structural diagram of a sampling system according to some embodiments of the present invention.

[0022] In the above drawings, each reference numeral represents respectively:

[0023] Sampling system 100, sedimentation device 14 for sampling net, first mounting plate 1, second mounting plate 4, first support plate 2, second support plate 3, connecting rod 8, first arc plate 5, second arc plate 6, third arc plate 7, lifting ring 9, reinforcing steel bar 10, net mouth frame 11, sedimentation plate 12, steel cable 13 Detailed implementation manners

[0024] Some embodiments of the present invention will be described below with reference to the accompanying drawings. Obviously, the described embodiments are merely exemplary embodiments of the present invention, rather than all embodiments.

[0025] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "top", "bottom", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be construed as indicating or implying relative importance. In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "mounted", "connected", "coupled" should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0026] Those skilled in the art can understand that the embodiments of the present invention can be widely applied to various sampling tests, sampling detections, sampling surveys, etc. for evaluating the current situation of fishery resources. For example, quantitative sampling surveys of fish eggs, larvae, etc.

[0027] Figure 1 A schematic structural diagram of the sedimentation device 14 for sampling net according to some embodiments of the present invention is shown. Figure 2 A front view of the sedimentation device 14 for sampling net according to some embodiments of the present invention is shown. Figure 3 A top view of the sedimentation device 14 for sampling net according to some embodiments of the present invention is shown.

[0028] As Figures 1-3As shown, the sedimentation device 14 for the sampling net may include a curved sedimentation bottom plate, a first mounting plate 1, a second mounting plate 4, a first support plate 2, a second support plate 3, a connecting rod 8, a first arc plate 5, a second arc plate 6, and a third arc plate 7. The curved sedimentation bottom plate is formed by sequentially welding the first arc plate 5, the second arc plate 6, and the third arc plate 7, presenting an overall continuously curved structure that is concave inward, i.e., a concave surface. The curvature of the first arc plate 5, the second arc plate 6, and the third arc plate 7 is all 15%. The included angle between the first arc plate 5 and the second arc plate 6 is 20°, and the included angle between the second arc plate 6 and the third arc plate 7 is also 20°. Therefore, the cross-section of the curved sedimentation bottom plate is trapezoidal. The structure of the sedimentation device 14 for the sampling net of the present invention with a trapezoidal cross-section and a curved bottom surface can reduce the storage space occupied after the net operation, facilitating storage and operation on the ship deck.

[0029] As Figures 1-3 shown, the first mounting plate 1 and the second mounting plate 4 are arranged in parallel at both ends of the curved sedimentation bottom plate, with a thickness of 4 mm. The part close to the curved sedimentation bottom plate is an arc transition area with a curvature of 15%, which is consistent with the curvature of the first arc plate 5, the second arc plate 6, and the third arc plate 7 to ensure structural continuity. The first support plate 2 and the second support plate 3 are vertically and spaced apart on the concave surface of the curved sedimentation bottom plate. The distance between the first support plate 2 and the second support plate 3 is 800 mm, the distance between the first support plate 2 and the first mounting plate 1 is 820 mm, and the distance between the second support plate 3 and the second mounting plate 4 is 820 mm. The parts of the first support plate 2 and the second support plate 3 close to the curved sedimentation bottom plate are convex arcs with a curvature of 15%, which can be welded to fit the concave surface of the curved sedimentation bottom plate to enhance structural stability. The sedimentation device 14 for the sampling net of the present invention has strong hydrodynamic performance. Through the concave surface gradient change, it guides the water flow to be evenly distributed along the curved surface, reducing local pressure peaks and vortex generation, thereby reducing resistance and enhancing the sinking force efficiency.

[0030] In the flume model test, when the sedimentation device 14 for the sampling net of the present invention is at the optimal working attack angle of 25°, its sinking force coefficient reaches 1.679, the resistance coefficient is 0.556, and the sinking-resistance ratio is 3.02. Compared with the "V"-shaped planar sedimentation device in the prior art, the sinking force coefficient of the sedimentation device 14 for the sampling net is increased by nearly 100%. In addition, compared with the "V"-shaped curved sedimentation device in the prior art, the sinking force coefficient of the sedimentation device 14 for the sampling net is also increased by 7%, effectively enhancing the sedimentation performance of the sampling net in water.

[0031] As Figures 1-3As shown, in some embodiments of the present invention, the sampler net sedimentation device 14 of the present invention includes two connecting rods 8. The diameter of the two connecting rods 8 is 18 mm. The two ends of the two connecting rods 8 are respectively fixed to the upper parts of the first mounting plate 1 and the second mounting plate 4. The two connecting rods 8 penetrate through the first support plate 2 and the second support plate 3. All connection points of the two connecting rods 8 with the first mounting plate 1, the second mounting plate 4, the first support plate 2, and the second support plate 3 are fixed by welding, which can be used to reinforce the overall structure of the sampler net sedimentation device 14.

[0032] Figure 4 Fig. 4 shows a side view of the sampler net sedimentation device 14 according to some embodiments of the present invention. As Figures 1-4 shown, the sampler net sedimentation device 14 may further include two groups of lifting rings. Each group of lifting rings may include two lifting rings 9. The two groups of lifting rings are respectively arranged on the tops of the first mounting plate 1 and the second mounting plate 4, and the two groups of lifting rings are respectively mounted on the side of the first mounting plate 1 and the second mounting plate 4 away from the curved sedimentation bottom plate. The symmetrically arranged two groups of lifting rings can fix the sampler net sedimentation device 14 under the sampler net through steel cables, so that the sampler net sedimentation device 14 can maintain a constant angle of attack during the sampling operation, thereby ensuring that the sampler net operates in a constant water layer, reducing the change of the sampling net operation water layer caused by the change of the towing speed, and improving the sampling accuracy and sample consistency.

[0033] As Figures 1-4 shown, the sampler net sedimentation device 14 further includes a plurality of reinforcing steel bars 10. The reinforcing steel bars 10 are fixedly arranged along the edges of the first arc plate 5, the second arc plate 6, and the third arc plate 7, which can reinforce the curved sedimentation bottom plate of the sampler net sedimentation device 14 and avoid damage due to dragging during the sampling operation.

[0034] Figure 5 Fig. 15 shows a schematic structural diagram of a sampling system 100 according to some embodiments of the present invention. As Figure 5 shown, the sampling system 100 may include: a sampling net, a sedimentation plate 12, a steel cable 13, and a sampler net sedimentation device 14. The sampling net may include a net mouth frame 11. The sedimentation plate 12 is a circular sedimentation plate. The sedimentation plate 12 is arranged on the sampling net. The sampler net sedimentation device 14 is connected to the sedimentation plate 12 through a steel cable 13. The lifting ring 9 is detachably connected to the sampling net, and the connection angle is adjustable so that the working angle of attack of the sampler net sedimentation device is 20° - 30°.

[0035] As Figure 5 shown, the sampler net sedimentation device 14 is suspended below the net mouth frame 11 through a steel cable 13. One end of the steel cable 13 is connected to the lifting ring 9 of the sampler net sedimentation device 14, and the other end is connected to the mounting rings on both sides of the circular sedimentation plate 12. The center of the sedimentation plate 12 is fixed to the net mouth frame 11 by screws, forming a stable triangular force structure.

[0036] In the sampling system 100 of the present invention, by adjusting the connection position of the steel cable 13 on the suspension ring of the sedimentation plate 12, the angle of attack of the sedimenter 14 for the sampling net can be changed. When the angle of attack is adjusted to 25°, the sinking force coefficient of the sedimenter 14 for the sampling net is 1.679, the drag coefficient is 0.556, and the sinking-drag ratio is stable at 3.02. In the range of towing speed from 0.5 to 3.0 m / s, the volatility of the sinking-drag ratio is less than 5%, which is significantly better than that of the traditional sedimenter. After the sampling operation is completed, the connection between the suspension ring 9 and the steel cable 13 is disassembled, and the sedimenter 14 for the sampling net is removed for storage, occupying a small space on the deck, which is convenient for storage and operation on the ship deck.

[0037] The sampling system 100 provided by the present invention improves the operation efficiency and data accuracy of the fish egg and larval sampling net, and can provide more reliable data support for fishery resource assessment and ecological monitoring. At the same time, its optimized structural design reduces the material use and weight of the sedimenter, significantly reducing the manufacturing and transportation costs.

[0038] It should be understood that the embodiments described in the present invention are only exemplary embodiments and do not constitute a limitation to the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.

Claims

1. A sedimentator for a sampling net, comprising: A curved sedimentation bottom plate with a concave surface; A first mounting plate and a second mounting plate respectively arranged at two ends of the curved sedimentation bottom plate; A first support plate and a second support plate spaced apart on the concave surface of the curved sedimentation bottom plate; And At least one connecting rod, with both ends respectively fixed on the first mounting plate and the second mounting plate and passing through the first support plate and the second support plate, wherein the curved sedimentation bottom plate comprises a first arc plate, a second arc plate and a third arc plate, and the first arc plate, the second arc plate and the third arc plate are fixedly connected in sequence to form the curved sedimentation bottom plate.

2. The sedimentation device for a sampling net according to claim 1, characterized in that, The curvature of the first arc plate, the second arc plate and the third arc plate is all 15%.

3. The sampler net sedimentation vessel according to claim 2, characterized in that, The first support plate comprises a first arc edge, forming a first convex circular arc with a radius of R, and the curvature of the first convex circular arc is 15% to be fixedly attached to the curved sedimentation bottom plate; The second support plate comprises a second arc edge, forming a second convex circular arc with a radius of R, and the curvature of the second convex circular arc is 15% to be fixedly attached to the curved sedimentation bottom plate.

4. The sedimentation device for a sampling net according to claim 1, characterized in that, The distance between the first support plate and the first mounting plate is 820 mm, and the distance between the second support plate and the second mounting plate is 820 mm. The distance between the first support plate and the second support plate is 800 mm.

5. The sedimentation device for the sampling network according to claim 1, characterized in that, The included angle between the first arc plate and the second arc plate is 20°; the included angle between the second arc plate and the third arc plate is 20°.

6. The sedimentator for a sampling net according to claim 1, characterized in that the diameter of the at least one connecting rod is 18 mm, and both ends are respectively fixed on the upper parts of the first mounting plate and the second mounting plate, and the connecting rod is fixedly welded to the first mounting plate, the second mounting plate, the first support plate and the second support plate.

7. The sedimentation device for a sampling net according to claim 1, characterized in that, It further comprises: At least two groups of lifting rings respectively arranged on the tops of the first mounting plate and the second mounting plate.

8. The sedimentation device for a sampling net according to claim 1, characterized in that, It further comprises: Reinforcing steel bars fixedly arranged along the edges of the first arc plate, the second arc plate and the third arc plate.

9. A sampling system, characterized in that, It comprises: A sampling net including a net mouth frame; A sedimentation plate arranged on the sampling net; The sedimentator for a sampling net according to any one of claims 1-8, and the sedimentator for a sampling net is connected to the sedimentation plate through a steel cable.

10. The sampling system according to claim 9, characterized in that, The lifting rings of the sedimentator for a sampling net are detachably connected to the sampling net through the steel cable so that the working attack angle of the sedimentator for a sampling net is 20°-30°.

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