Sand rain device capable of automatically controlling drop distance and application method of device

Abstract

The invention discloses a sand rain device capable of automatically controlling the drop distance and an application method of the device. The sand rain device comprises a sand hopper, a sand falling device, a model box and an automatic lifting pedestal; the drop distance is controlled accurately in a manner that the weight of scattered sand is converted into the sinking height of the pedestal. The invention also discloses an application method of the sand rain device capable of automatically controlling the drop distance. The application method of the sand rain device capable of automatically controlling the drop distance comprises the following technical steps: determining the density of a sand sample, determining the drop distance, fixing the model box on the pedestal which can automatically adjust the sinking height by virtue of the weight, horizontally moving the sand hopper and scattering the sand, wherein the pedestal automatically sinks according to the weight of the sand sample until the sand scattering is finished. The vertical height of the sand falling device does not need to be moved in the sand scattering process, and the sinking amount of the pedestal is always the same with the height of the sand sample, namely the drop distance is constant all the time. The sand rain device capable of automatically controlling the drop distance overcomes the defects that the sand sample is nonuniform and the density is inaccurate as the drop distance can not be accurately controlled in the conventional sand rain sample prepartion process and has the advantages of high accuracy, convenience in operation, simple and feasible technology, high practicability and the like.

Description

[0001] Technical field [0002] The invention relates to a device and a use method that can automatically convert the weight of sand sprinkling into a sinking height, in particular to a sand rain device that automatically controls the falling distance and a use method. Background technique [0003] Sand rain method is a commonly used method for sample preparation in conventional tests of non-cohesive soils. The density of the non-cohesive soil sample is one of the most important control parameters in the sample preparation process, which is affected by many factors, such as the shape of the sand bucket, the shape of the hourglass, the shape of the model box, the mesh of the steel screen, and the average drop distance. Among them, when the shape of the sand bucket, the shape of the hourglass, the shape of the model box and the mesh of the steel sieve are selected, the relationship between them and the density of the sand sample can be obtained by calibration, that is, these paramet...

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Problems solved by technology

[0006] The purpose of the present invention is to overcome the shortcomings of the traditional sand rain method that it is difficult to accurately control the falling distance, san

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