CN-122004179-A - Plankton net with in-situ separation sampling device

CN122004179ACN 122004179 ACN122004179 ACN 122004179ACN-122004179-A

Abstract

The invention discloses a plankton net with an in-situ separation sampling device, which belongs to the technical field of marine ecological monitoring equipment and comprises a plankton net and the in-situ separation sampling device, wherein the in-situ separation sampling device comprises a connecting piece and a separation sampling piece, the separation sampling piece comprises a separation barrel and a sampling barrel, a separation cavity is formed in the separation barrel, and a forward conical screen mesh with an inclination reduced towards the inclined position of the sampling barrel is arranged in the separation cavity. The inclined design of the forward conical screen mesh utilizes the action of gravity and water flow to enable small fish eggs to quickly pass through the forward conical screen mesh to enter the next-stage separation cylinder, and large fish larvae cannot be intercepted into the sampling cylinder through the forward conical screen mesh to realize in-situ physical separation, and the inverted conical guide seat guides water flow to intensively impact the highest position of the screen mesh through the guide opening, so that the integral screening effect is further improved, the screen mesh blocking risk is reduced, the separation efficiency is improved, the mixing of samples due to turbulence in the separation process is avoided, and the survival rate of samples to be tested is improved.

Inventors

SONG PENGBO
HAN MENGWEN
WANG QIANG
WANG JIACAI
ZHU GUANG
XU YUNZHENG

Assignees

山东畜牧兽医职业学院

Dates

Publication Date: 20260512
Application Date: 20260311

Claims (10)

1. The plankton net comprises a plankton net and an in-situ separation sampling device which is detachably mounted at the bottom end of the plankton net, and is characterized in that the in-situ separation sampling device comprises a group of connecting pieces and a plurality of groups of separation sampling pieces which can be connected end to end, the separation sampling pieces comprise a separation barrel positioned at the center and a sampling barrel coaxially mounted at the outer side of the separation barrel, a separation cavity is formed in the separation barrel, a forward conical screen which is obliquely lowered towards the inclined position of the sampling barrel is mounted in the separation cavity, an inverted conical flow guide seat which is detachably mounted on the inner wall of the separation cavity is connected to the right upper side of the forward conical screen through a vertical rod, and a flow guide opening which guides flow to the highest position of the forward conical screen is formed in the center of the inverted conical flow guide seat.
2. The plankton net with the in-situ separation sampling device according to claim 1, wherein the inverted cone-shaped flow guide seat is installed on the inner wall of the separation cavity through threads, a cross rod for assisting the inverted cone-shaped flow guide seat to rotate by force is connected in the flow guide opening, and the top end of the vertical rod is connected with the bottom of the cross rod.
3. The plankton net with the in-situ separation sampling device according to claim 1, wherein a plurality of first separation openings which are close to the position of the forward conical screen mesh and distributed in a circumferential array are formed in the side wall of the separation cavity, a plurality of arc-shaped baffle plates which are parallel to the vertical rods are connected between the forward conical screen mesh and the reverse conical flow guide seat, and each arc-shaped baffle plate is just located between two adjacent first separation openings.
4. The plankton net with in-situ separation sampling device according to claim 3, wherein a sampling cavity is formed in the sampling cylinder, a horizontal screen arranged horizontally is arranged at the bottom of the sampling cavity, and a plurality of separation ports II which correspond to the first separation port in position and have the same size are formed in the side face of the sampling cavity, which faces the separation cavity.
5. The plankton net with the in-situ separation sampling device according to claim 1, wherein an installation table horizontally arranged is connected to the outer side wall of the separation barrel, a plurality of slots distributed in a circumferential array are formed in the installation table, a plurality of plugs distributed in a circumferential array and capable of being inserted into the slots from bottom to top are connected to the top of the sampling barrel, and a tightening ring detachably installed with the plugs through threads is installed above the installation table.
6. The plankton net with the in-situ separation sampling device according to claim 5, wherein a plurality of avoidance grooves I which are uniformly distributed are formed in the surface of the tightening ring, and a plurality of avoidance grooves II which are uniformly distributed and vertically correspond to the avoidance grooves are formed in the surface of the mounting table.
7. The plankton net with the in-situ separation sampling device according to claim 1, wherein the plankton net comprises a net body and a net mouth arranged at the center of the bottom of the net body, the top of the net body is a net mouth, and an elastic rope capable of changing the opening size of the net mouth is arranged at the edge of the net mouth.
8. The plankton net with the in-situ separation sampling device according to claim 7, wherein a main traction rope is arranged at the top of the net body, the main traction rope is simultaneously connected with a plurality of auxiliary traction ropes distributed in the circumferential direction through a ball knot, and all the auxiliary traction ropes sequentially penetrate through rope rings arranged on the outer side of the net body and then finally guide to the in-situ separation sampling device.
9. The plankton net with in-situ separation sampling device according to claim 8, wherein the connecting piece comprises a connecting sleeve, the top of the connecting sleeve is connected with the inner wall of the net nozzle through threads, and the bottom of the connecting sleeve is connected with the inner wall of the separation cavity through threads.
10. The plankton net with the in-situ separation sampling device according to claim 9, wherein a plurality of traction lugs equal to the auxiliary traction ropes in number are connected to the side wall of the connecting sleeve, and traction grooves for hanging the auxiliary traction ropes are formed in the traction lugs.

Description

Plankton net with in-situ separation sampling device Technical Field The invention relates to the technical field of marine ecological monitoring equipment, in particular to a plankton net with an in-situ separation sampling device. Background The existing marine plankton sampling mainly depends on a large plankton net (such as a trawl net or a vertical trawl net), and the working flow of the marine plankton sampling is that mixed groups of plankton (including fish eggs, fish larvae and other plankton) are caught through a net tool, the sample is transferred to a laboratory after the trawl net is completed, and target samples (such as the fish eggs and the fish larvae) are separated through subsequent treatments such as filtration, centrifugation or screening. The conventional method has the following general problems: the survival rate of the young fish is low, namely, the young fish is easy to damage and even die on the body surface due to collision, extrusion or water flow impact after being sampled and subjected to mechanical filtration (such as filter screen extrusion and centrifugal separation) for many times, so that the accuracy of the follow-up survival rate statistics and ecological research is affected; The counting and classifying errors are large, namely, the morphological difference of fish eggs (tiny, transparent or semitransparent) and fish larvae (tiny living organisms) in a mixed sample is small, and the fish eggs are difficult to completely separate through conventional screening after being mixed, so that counting is easy to miss or misclassification is easy to occur in a laboratory; The operation is complicated, the efficiency is low, the traditional process needs multiple steps of sampling, recycling and laboratory processing, the target sample cannot be directly separated in situ at sea, the time and the labor are consumed, professional laboratory equipment is relied on, and the high-frequency and large-range ecological monitoring requirements are difficult to meet. Disclosure of Invention The invention aims to solve the technical problem of providing a plankton net with an in-situ separation sampling device, which is used for directly separating fish eggs from young fish in the trawl process by the combined design of the plankton net and the in-situ separation sampling device, realizing the sampling, namely the separation, and combining flexibility and sealing property, and is used for solving the problems of mixing of the fish eggs and the young fish, high mechanical damage rate and low operation efficiency in the traditional plankton sampling. In order to achieve the above purpose, the present invention provides the following technical solutions: a plankton net with an in-situ separation sampling device comprises a plankton net and the in-situ separation sampling device which is detachably arranged at the bottom end of the plankton net; The in-situ separation sampling device comprises a group of connecting pieces and a plurality of groups of separation sampling pieces which can be connected end to end, wherein the separation sampling pieces comprise a separation barrel positioned at the center and a sampling barrel coaxially arranged at the outer side of the separation barrel, a separation cavity is formed in the separation barrel, a forward conical screen mesh which is inclined and lowered towards the inclined position of the sampling barrel is arranged in the separation cavity, an inverted conical flow guide seat which is detachably arranged on the inner wall of the separation cavity is connected to the right upper side of the forward conical screen mesh through a vertical rod, and a flow guide opening which guides flow to the highest position of the forward conical screen mesh is formed in the center of the inverted conical flow guide seat. Through the technical scheme, the inclined design of the forward conical screen mesh utilizes the action of gravity and water flow, so that small fish eggs quickly pass through the forward conical screen mesh to enter the next-stage separating cylinder, and large fish larvae cannot be intercepted into the sampling cylinder through the forward conical screen mesh to realize in-situ physical separation, and the reverse conical guide seat guides water flow to intensively impact the highest position of the screen mesh through the guide opening, so that the integral screening effect is further improved, the screen mesh blocking risk is reduced, the separation efficiency is improved, the mixing of samples due to turbulence in the separation process is avoided, and the survival rate of samples to be tested is improved. As a preferable implementation mode of the plankton net with the in-situ separation sampling device, the inverted cone-shaped flow guide seat is arranged on the inner wall of the separation cavity through threads, a cross rod for assisting the inverted cone-shaped flow guide seat to rotate by force is connected in the flow guide openi