An online automatic collection and storage device for aquatic biological samples

Abstract

The invention discloses an online automatic collection and storage device for aquatic organism samples. The device is composed of a control unit, a support, a sample feeding unit, a distribution unit and a collection unit. The online automatic collection and storage device is programmed through a PLC and can operate all actions automatically according to preset parameters, accurate sampling is achieved, the automation degree is high, sampling efficiency is high, and manpower and material resource cost is saved; a depth sensor is adopted for the device, accurate control over the sampling depth is achieved, layered sampling can be conducted on water bodies at different depths, and the water sample detection environment is made to more approach the natural environment; running time of a peristaltic pump is controlled in a quantitative mode, accurate control over the filtered water yield is achieved, and the problem that in most of existing technologies, the filtered water yield is large in error is solved; by means of the device, the samples can be collected automatically, the function of adding a fixing agent in a quantitative mode at site is achieved, and stability of the collected samples is improved.

Description

technical field [0001] The invention relates to an online automatic collection and storage device for aquatic biological samples. The device can automatically collect and store plankton samples at different depths in situ. Background technique [0002] When diagnosing the ecological health of rivers, lakes, oceans and other water bodies, it is necessary to sample and investigate aquatic plankton samples to understand the diversity of plankton. At present, plankton samples in aquatic ecosystems are mainly collected by dragging nets back and forth along the shore or renting boats to drag nets for sample collection. This method has the following obvious defects: (1) Manual operation, low efficiency: affected by water bodies along the coast, ships The constraints are large, the sampling range is limited, and the sample representativeness is poor; and it takes too much manpower and material resources, and the work efficiency is low; (2) It is difficult to accurately control the s...

AI Technical Summary

Problems solved by technology

At present, plankton samples in aquatic ecosystems are mainly collected by dragging nets back and forth along the shore or renting boats to drag nets for sample collection. This method has the following obvious defects: (1) Manual operation, low efficiency: affected by water bodies along the coast, ships The constraints are large, the sampling range is limited, and the sample representativeness is poor; and it takes too much manpower and material resources, and the work efficiency is low; (2) It is difficult to accurately control the sampling depth: affected by the water flow, the plankton net is easy to drift away from the sampling point when sampling, forming a large area. Large trawl angles lead to changes in sampling depth; (3) Large errors in the calculation of filtered water volume: due to changes in the sampling depth of plankton nets, large errors exist in the estimated filtered water volume based on wire rope release length, sampling angle, and sampling time , but the phytoplankton biodensity calculated by the amount of filtered water does not match the actual situation; (4) only has the collection function, and cannot save the sample: in actual sampling, the sampler often only collects the sample and does not have the preservation function

For example, the authorized announcement number CN 202057508 U introduces a pulley support frame, connects the water collection device and the filter biological sampler to collect phytoplankton samples, can quantitatively collect samples at different water depths, and greatly improves the sampling efficiency. Manual operation is also required, especially when sampling is frequent and the maintenance cost is high

Authorized notice number CN203181818 U has designed a drive motor that can float on the water surface and move, a motor steering gear that can change the direction of advancement is installed in its front section, and a net that collects plankton is installed at the tail end, and samples are collected by moving back and forth of the net; The device can realize automatic sampling, but it is difficult to accurately control the sampling depth and water filtration volume

Patent Publication No. CN101487772A connects the submersible pump to the water inlet of the corresponding plankton filter through a multi-way shunt, and controls the solenoid valve, electronic flow meter, pressure controller, etc. through a single-chip microcomputer to accurately control the injection volume and sampling depth, with a high degree of automation , but the device cannot realize in-situ sample storage, nor does it have the function of timing sampling, and it cannot realize the sampling of the same point in different time periods

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