A standardized automatic sample preparation machine for geotechnical samples

Abstract

The invention relates to a standardized automatic sample preparation machine for geotechnical samples. It includes: a control module, the control module includes a control terminal and a servo controller connected to the control terminal; a servo loading module, the servo loading module is controlled by the control module, which includes a piston assembly; a sample A mold module, the sample mold module is movably connected with the piston assembly, so that the piston assembly can slide in the cylinder of the sample mold module; a sensor module, the sensor module is arranged on the servo loading module and connected with the servo controller; and an upper exhaust and liquid discharge pot and a lower exhaust and liquid discharge pot connected with the sample mold module. Adopting the present invention to carry out standardized automatic sample preparation removes errors caused by manual operations, can realize the uniformity of various performances of the same batch of samples, and improve the accuracy of experimental results; Effective utilization of mechanical instruments.

Description

technical field [0001] The invention relates to the technical field of geotechnical sample preparation equipment, in particular to a standardized automatic sample preparation machine for geotechnical samples. Background technique [0002] Before carrying out the soil engineering test, it is necessary to carry out the work of soil sample preparation first. The laboratory mainly prepares samples according to the national standard "Standards for Soil Test Methods" GB / T50123-1999 and the Ministry of Water Resources industry standard "Soil Test Procedures" SL237-1999 in the section "Sample Preparation and Saturation". That is, according to the volume of the sleeve and the dry density required by the test, the required mass of wet soil is poured into the sampler equipped with the sleeve, and compacted to the required density. The sampler structure is as figure 1 shown. [0003] If a saturated sample is needed for the test, it can be saturated before loading the sample. Use the ...

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Problems solved by technology

In the process of sample preparation, from weighing soil, adding water to sampling, each step has random errors caused by manual operation, especially in the process of sampling, the verticality of the sampling device cannot be guaranteed, making the surface of the sample uneven

[0006] 2. When preparing soil samples with high density, the impact force provided by the sample hammer is not enough, the air inside the soil sample cannot be discharged in time, and it is difficult to achieve the expected density

[0007] The above two reasons lead to large differences in the states of multiple samples in the same group of experiments. When the experimental samples themselves have large errors, errors that cannot be corrected have been brought in before the start of the experiment, which in turn affects the accuracy of the experimental results. and credibility

[0008] 3. When preparing samples with high moisture content, the samples are relatively thin. Using a compactor will cause the soil samples to splash around due to the impact force. At the same time, the impact force will also increase the pore water pressure inside the soil samples, which is not easy to form the soil samples.

[0009] 4. The remolded soil can only reach the original density and water content. Due to the lack of consolidation, its structure, voids, uniformity and original soil are very different.

[0010] 5. When preparing saturated samples, the vacuum saturation method takes a lot of time, and the saturation of the instrument program takes up a lot of instrument use time, which affects the efficiency of the experiment

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