Unlimited depth self-propelled riverbed material sampling device

Abstract

The invention relates to an unlimited depth self-propelled riverbed material sampling device. The sampling device comprises a working ship, a composite steel cable, a support frame and a sampler, thesampler comprises an information bin, a power bin, a sample bin, a sand discharging cone and a leakage-proof part. The sampler and the support frame sink together through the composite steel cable onthe working ship, and the water depth is not limited; the sampler can be vertically suspended and automatically and integrally pushed downwards when being close to the bed surface, and the sampling depth is not limited. The counter weight is pulled by the chain to roll along the cylinder wall in a three-point simple supporting mode and ascend and descend in the air, and it is guaranteed that resistance is small; the total length of the thin-wall pipe orifice and the sampler is relatively short so that the energy of push-down driving is relatively small; the extrusion deformation of the sand sample in the short pipe type sample bin is very small, and the bin cover is independently opened and closed to realize high fidelity of sampling; the leakage-proof part ensures that the sand sample does not slip and leak; and a water pressure gauge in the sampler detects the depth of the sampling point away from the bed surface. Sampling of the device is not limited by depth, and the riverbed material sample can be safely, reliably and accurately collected in a high-fidelity mode.

Description

technical field [0001] The invention belongs to the technical field of water conservancy measurement, in particular to an unlimited-depth automatic-propelled riverbed quality sampling device. Background technique [0002] Streambed sampling is a routine method for studying the physics, chemistry, mechanics, mineral structure, biological occurrence and pollution status of underwater sediments such as rivers, lakes, reservoirs, and coastal areas. Collecting real and complete fidelity samples of sediments at different water depths and under different working conditions is still one of the key technologies for studying these issues. [0003] According to application requirements, the water depth range can be roughly divided into shallow water within 30m, such as general rivers and lakes; medium water depth of 30-300m, such as large reservoirs and coastal waters; and large water depth greater than 300m, such as continental shelf seas, etc. The maximum depth of streambed sampling...

AI Technical Summary

Problems solved by technology

The over-constraint of the 6 linear bearings can easily produce unbalanced force and cancel each other out the driving force

In fact, the casing suspended to the bed surface is also difficult to maintain vertically, and the resistance of the heavy hammer to the movement in the water body is very large, and the downward force of the hammer is limited.

[0013] Among all kinds of sampling devices, only the sampling tube can be inserted into the river bed, and the sampling depth is limited. For example, the piston deep-water drill of SDI company in the United States, L / D is greater than 230, F λ =0.025×L / D>5, the sand sample will be squeezed and deformed

That is to say, the sampling depth of this mode and the extrusion deformation of the sample are completely opposite and irreconcilable contradictions

[0014]The current sampling method of sediment on the bed surface of reservoirs, rivers, lakes and sea estuaries cannot fully guarantee high fidelity. For example, the maximum sedimentation depth of the Three Gorges Reservoir 100m, deep sampling is urgently needed to analyze the physical characteristics and biochemical properties of each layer of sediment

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