Full-automatic reciprocating type sandy soil sample preparing instrument

Abstract

The invention relates to a full-automatic reciprocating type sandy soil sample preparing instrument which is characterized by comprising a rigid frame, wherein the rigid frame is fixedly connected with a vertical lifting system, a movable cross beam is fixedly connected with the vertical lifting system, a horizontal movable system is fixedly connected with the movable cross beam, a movable bracket is fixedly connected with the horizontal movable system, a funnel assembly is hoisted at the lower end of the movable bracket, a distance measuring instrument is fixedly connected with the funnel assembly, and a PLC (programmable logic controller) is fixedly connected with the rigid frame; the vertical lifting system, the horizontal movable system and the distance measuring instrument are respectively electrically connected with the PLC. According to the working process, sand in a funnel is subjected to sand rain scattering by virtue of a duckbill, the distance measuring instrument is used for monitoring the distance between the funnel assembly and the sand surface in real time; the horizontal movable system is used for driving the funnel assembly to move horizontally; a guide assembly is used for guiding the movable bracket and the funnel assembly; the vertical lifting system is used for regulating the height to control the falling distance of sand in sample preparation; and the PLC is used for controlling the operation of a speed control motor, thereby realizing automation of the whole course of sample preparation of the system.

Description

technical field [0001] The invention relates to test equipment, which is a fully automatic reciprocating sand sample preparation instrument developed independently based on the basic principle of sand rain method sample preparation. Background technique [0002] Geotechnical model experiments have high requirements on test equipment, test materials and model sample preparation, and the sample preparation link is a crucial technical link in model experiments. For sand samples, the common sample preparation methods are: vibration method, layered compaction method and sand rain method. Because the sand rain method simulates the deposition of sand under the action of wind or water flow, the formed sample is closer to the actual natural sand layer, so it is widely used in the sandy soil geotechnical model experiment. In 1988, Professor Pu Jialiu of Tsinghua University used a reciprocating flat-mouth funnel to sprinkle sand for sand rain method in the centrifuge model experiment ...

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Problems solved by technology

On this basis, Zeng Hongjing and Wang Zhongtao of Dalian University of Technology also used a single-hole funnel, hung it through a crane guide chain, and wrote command sentences to make the funnel move along the specified path along the chute. In the same way, the test found that due to the lack of motor control precision and the slight shaking of the funnel, the density of the sand sample under the same preparation conditions fluctuated within 5%.

[0004] It can be seen that although previous research results have improved the sand sample loading method, the degree of automation of sample preparation is still low, and human factors have a great influence, and the uniformity of samples and the repeatability of sample preparation cannot be fully guaranteed.

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