A detachable bottom mud sampler

Abstract

The invention discloses a removable deepwater bottom mud sampler which comprises an orientation component, a weight control part and a sampling cylinder, wherein the orientation component, the weight control part and the sampling cylinder are in threaded connection from top to bottom in sequence; an upper sealing component is arranged at the upper part of the sampling cylinder; a lower sealing component is arranged at the bottom of the sampling cylinder. Due to orientation empennage design, the removable deepwater bottom mud sampler can vertically contact a bottom mud surface, so that the vertical distribution characteristic of a sample and the integrity of the sample are maintained to the maximum extent; on the basis of the weight of a conventional orientation component, the weight control part of which the configuration can be adjusted is additionally arranged, so that the diving acceleration of the sampler is increased, and the requirements of deepwater sampling and sampling of bottom mud of different thicknesses are met; sealing components are respectively arranged at two ends of the sampling cylinder, and the two sealing components are controlled to be opened or closed according to the water flow direction and the gravity function of the sample, so that the sealing performance is improved; the removable type deepwater bottom mud sampler is simple and clear in overall structure, can be assembled and disassembled according to practical environments, and is good in portability and high in operability.

Description

technical field [0001] The invention relates to the technical field of deep-water sediment sampling in river and lake environmental monitoring, in particular to a detachable deep-water sediment sampler. Background technique [0002] In rivers or lakes, bottom mud is usually a mixture of clay, silt, organic matter and various minerals. It is formed by depositing at the bottom of the water environment after long-term physical, chemical, biological and water transport, and is also an ecological environment. important part of the system. When the surface water body is seriously polluted, some pollutants in the water will be stored in the sediment through sedimentation or adsorption by particulate matter. At the same time, the re-release of pollutants in the river sediment will cause secondary pollution to the river water body. The environmental monitoring and research work of the water environment sediment is urgent. [0003] Sediment sampling is the prerequisite work for the ...

AI Technical Summary

Problems solved by technology

Its main advantage is that it is easy to operate, but it also has the following main defects: ① According to the "two-step" sampling of inserting first and then grabbing, the sediment is greatly disturbed during the entire operation process, and it is difficult to completely grab the sample in the grab bucket. When the sample is full of bottom mud, when it is lifted by the grab bucket, the sample in the bucket is easily mixed and disturbed by the action of water flow, the sample integrity is poor, and it is difficult to obtain a layered sample; The surface sediment with a high rate is prone to overflow due to the influence of water flow when grasping, and the success rate of sediment grasping is low.

[0004] At present, the columnar sampler is another commonly used sediment sampling device. After the columnar cavity is inserted into the sediment, it is sealed by hinges or ropes, which makes up for the lack of integrity of the grab sampler. Larger water environment sediments are limited by the insertion depth, and the sampling volume is sometimes difficult to meet the monitoring or research needs. At the same time, the sealing device controlled by a special hinge or rope is easily limited by length, and the actual operability is poor, which affects the success of sampling to a certain extent. Rate and Sampling Efficiency

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