Special quantitative investigation trawl device for acaudina molpadioides

Abstract

The utility model relates to the technical field of marine benthic organism survey, and discloses a special quantitative survey trawl device for acaudina molpadioides, which comprises a gravity comb-shaped plough and an intercepting net, the intercepting net is connected to the gravity comb-shaped plough, the gravity comb-shaped plough comprises two side baffles which are symmetrically arranged, a gravity shovel plate is welded between the lower ends of the two side baffles, and the gravity shovel plate is connected with the intercepting net. A tension rod is welded between the upper portions of the two side baffles, a fixing rod is welded between the middles of the two side baffles, and three sets of triangular supports are evenly welded between the tension rod and the gravity shovel plate. The problem that the original quantitative survey device for the marine large benthonic animals is not suitable for the acaudina molpadioides due to the limitation of the sampling area and the sampling depth is effectively solved; meanwhile, the trawl mode reduces the randomness error of quantitative survey, improves the survey data acquisition efficiency, and enables the survey statistical data to be more reliable and accurate.

Description

Technical Field

[0001] The utility model belongs to the technical field of marine benthic organism investigation, in particular to a trawl device for quantitative investigation of sweet potatoes. Background Art

[0002] Sea sweet potatoes are large shallow-water benthic organisms that live in sedimentary environments ranging from the intertidal zone to a depth of 80 meters. Sea sweet potatoes are generally hidden below 15 cm on the surface of the seabed. According to the results of quantitative or qualitative surveys of sea sweet potatoes conducted in the past in this sea area, it is difficult to obtain sea sweet potatoes with the existing quantitative survey tools (grab-type mud samplers) and qualitative survey tools (qualitative trawls for benthic organisms) for large shallow-water benthic organisms. First, because sea sweet potatoes are large-sized benthic organisms, their living space on the seabed may be wider than that of general large-sized benthic organisms, and their number per unit area is limited. The limited sampling area of ​​the grab-type mud sampler may miss the area where sea sweet potatoes live; second, because sea sweet potatoes live in areas with deeper bottom sediments, the sampling depth of the grab-type mud sampler and the existing qualitative trawl is limited (generally about 10 to 15 cm below the bottom), and it is difficult to reach the depth where sea sweet potatoes live. Utility Model Content

[0003] In view of the above situation, in order to overcome the defects of the prior art, the utility model provides a trawl device for quantitative investigation of sweet potatoes, which effectively solves the problems raised in the above background.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a trawl device for quantitative survey of sweet potatoes, comprising a gravity comb plow and an interception net, wherein the interception net is connected to the gravity comb plow;

[0005] The gravity comb plow includes two symmetrically arranged side baffles, a gravity shovel plate is welded between the lower ends of the two side baffles, a tension rod is welded between the upper parts of the two side baffles, a fixing rod is welded in the middle of the two side baffles, three groups of triangular brackets are evenly welded between the tension rods and the gravity shovel plates, ear-shaped rings are formed at the upper ends of the triangular brackets, and a comb plow is evenly welded at the rear end of the fixing rod.

[0006] Preferably, the intercepting net is composed of a front-end net, a middle-end net and a rear-end net bag, and the front-end net is provided with an opening, which is connected to the rear end of the gravity comb plow.

[0007] Preferably, the front end net, middle end net and rear end net bag are arranged as a whole in a cone shape in the opened state, the opening diameters of the front end net, middle end net and rear end net bag decrease successively, and the surface apertures of the front end net, middle end net and rear end net bag gradually decrease from the net mouth to the bottom.

[0008] Preferably, the gravity comb plow is made of stainless steel.

[0009] Compared with the prior art, the beneficial effects of the utility model are:

[0010] 1. The utility model uses a trawl device composed of a gravity comb plow and an interception net, which effectively solves the problem that the original quantitative survey device for large marine benthic animals is not suitable for sea sweet potatoes due to the limitations of sampling area and sampling depth; at the same time, the trawl method reduces the random error of quantitative survey, improves the efficiency of survey data acquisition, and makes the survey statistical data more reliable and accurate;

[0011] 2. The design of the specifications and length of the interception net at the rear end of the new trawl device can effectively avoid harm to other organisms. The comb-shaped plow can filter out as much bottom sediment as possible in the survey area, while avoiding the problem of clogging of the interception net. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation to the present invention.

[0013] In the attached picture:

[0014] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0015] Figure 2 This is a structural schematic diagram of the gravity comb plow of the utility model;

[0016] Figure 3 This is a structural schematic diagram of the gravity comb plow of the utility model from another perspective;

[0017] Figure 4 It is a front view of the gravity comb plow of the utility model;

[0018] Figure 5 It is a top view of the gravity comb plow of the utility model;

[0019] In the figure: 1. Gravity comb plow; 101. Side baffle; 102. Gravity shovel plate; 103. Tension rod; 104. Fixing rod; 105. Triangular bracket; 106. Ear ring; 107. Comb plow; 2. Intercepting net; 201. Front end net; 202. Middle end net; 203. Rear end net bag. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments; based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0021] Embodiment 1, by Figure 1-Figure 5 It is given that the utility model comprises a gravity comb plow 1 and an interception net 2, wherein the interception net 2 is connected to the gravity comb plow 1;

[0022] The gravity comb plow 1 comprises two symmetrically arranged side baffles 101, a gravity shovel plate 102 is welded between the lower ends of the two side baffles 101, a tension rod 103 is welded between the upper parts of the two side baffles 101, a fixing rod 104 is welded in the middle of the two side baffles 101, three sets of triangular brackets 105 are uniformly welded between the tension rod 103 and the gravity shovel plate 102, an ear-shaped ring 106 is formed at the upper end of the triangular bracket 105, and a comb plow 107 is uniformly welded at the rear end of the fixing rod 104;

[0023] The gravity shovel 102 is used for suspending the bottom mud sample in the deep seabed;

[0024] The side baffle 101 is used to fix the whole frame and prevent the bottom mud sample from leaking sideways;

[0025] The ear ring 106 is used to connect the survey vessel rope;

[0026] The tension rod 103 is used to connect the trawl and bear the tension of the survey trawl operation;

[0027] The comb plow 107 is used to separate the bottom mud sample and remove large debris on the seabed;

[0028] The triangular bracket 105 is used to fix the overall frame and improve the structural stability;

[0029] The fixing rod 104 is used to fix the comb plow 107 and the baffles 101 on both sides to improve stability;

[0030] The interception net 2 is composed of a front-end net 201, a middle-end net 202 and a rear-end net bag 203. The front-end net 201 is provided with an opening, and the opening is connected to the rear end of the gravity comb plow 1;

[0031] The front-end net 201 is used to filter sediments and large organisms with strong swimming ability;

[0032] The middle-end net 202 is used to filter sediments and medium-sized and weak-swimming organisms;

[0033] The rear end net bag 203 is used to intercept the individuals of sweet potatoes without swimming ability;

[0034] The front net 201, the middle net 202 and the rear net bag 203 are set in a cone shape in the open state. The opening diameters of the front net 201, the middle net 202 and the rear net bag 203 decrease successively, and the surface apertures of the front net 201, the middle net 202 and the rear net bag 203 gradually decrease from the net mouth to the bottom.

[0035] The gravity comb plough 1 is made of stainless steel.

[0036] Working principle: When in use, the gravity comb plow 1 is connected to the interception net 2, and the edge of the net mouth of the interception net 2 is woven and connected with the outer edge of the frame of the gravity comb plow 1 to form the entire trawl device. Ear rings 106 are welded on both ends and the middle position of the edge on one side of the top of the gravity comb plow 1, which are used to connect the rope of the survey vessel during the trawl survey. When the gravity comb plow 1 is pulled by the survey vessel to obtain the sea sweet potato, the gravity shovel plate 102 is used to suspend the bottom mud sample in the deep layer of the seabed, and the side baffle 101 is used to prevent the side leakage of the bottom mud sample. The comb plow 107 is used to separate the bottom mud sample and remove large individual debris on the seabed when the device is towed. The material shoveled by the gravity comb plow 1 enters the interception net 2, first enters the front end net 201, which is used to filter sediments and large individuals with strong swimming ability, and then enters the middle end net 202, which is used to filter sediments and medium individuals and organisms with weak swimming ability, and finally enters the rear end net bag 203, which is used to intercept the sea sweet potato individuals without swimming ability;

[0037] Through the setting of the trawl device, the original fixed effective sampling area is changed to the actual effective trawl area. The trawl form makes the sampling area larger, the sampling deeper, and the probability of obtaining sweet potato samples is greater, which indirectly makes the quantitative survey results more scientific and accurate.

Claims

1. A trawl device for quantitative survey of sweet potatoes, comprising a gravity comb plow (1) and an interception net (2), characterized in that: The interception net (2) is connected to the gravity comb plow (1); The gravity comb plow (1) comprises two symmetrically arranged side baffles (101), a gravity shovel plate (102) is welded between the lower ends of the two side baffles (101), a tension rod (103) is welded between the upper parts of the two side baffles (101), a fixing rod (104) is welded in the middle of the two side baffles (101), three sets of triangular brackets (105) are uniformly welded between the tension rods (103) and the gravity shovel plate (102), an ear-shaped ring (106) is formed at the upper end of the triangular bracket (105), and a comb plow (107) is uniformly welded at the rear end of the fixing rod (104).

2. A trawl device for quantitative survey of sweet potatoes according to claim 1, characterized in that: The interception net (2) is composed of a front-end net (201), a middle-end net (202) and a rear-end net bag (203); the front-end net (201) is provided with an opening, and the opening is connected to the rear end of the gravity comb-shaped plow (1).

3. A trawl device for special quantitative survey of sweet potatoes according to claim 2, characterized in that: The front end net (201), the middle end net (202) and the rear end net bag (203) are arranged in a cone shape in an open state, the opening diameters of the front end net (201), the middle end net (202) and the rear end net bag (203) decrease in sequence, and the surface apertures of the front end net (201), the middle end net (202) and the rear end net bag (203) gradually decrease from the net opening to the bottom.

4. A trawl device for quantitative survey of sweet potatoes according to claim 1, characterized in that: The gravity comb plough (1) is made of stainless steel.

Images