Cutting ring soil-sample extruding machine for geotechnical tests

Abstract

The invention relates to a cutting ring soil-sample extruding machine for geotechnical tests, belonging to geotechnical test equipment. The extruding machine comprises a machine body, a work frame, an air cylinder, an electromagnetic valve, an air source processing assembly and an electric control box and is characterized in that the work frame is designed with a sample outlet hole, a cutting ring accommodation groove and a cutting ring profile modeling; a center of a piston in the air cylinder is fixed with a punching shaft extending out the lower end of the air cylinder, and the lower end of the air cylinder is fixed with a cylindrical punching head through coupling screws; the electromagnetic valve is designed with a work air delivery pipe, a return air delivery pipe, an air supply pipe and a conducting wire for electric connection; the air source processing assembly consists of an air inlet interface, a water vapor filter, a pressure displaying meter and a pressure adjusting valve; and the electric control box is designed with a hand-operated switch, a foot-controlled switch and a pressure holding time adjusting knob. Compared with the prior art of hand excavation and percussion, the extruding machine provided by the invention has the advantages that the sample taking time is averagely reduced by 92.7 percent so that the detection efficiency is greatly increased and the labor intensity is reduced; and the cutting ring deformation, cutting edge curl and even damage due to the hand excavation and percussion are also avoided.

Description

technical field [0001] The invention relates to equipment for geotechnical testing, in particular to a ring-knife soil sample extruder for geotechnical testing. Background technique [0002] In the geotechnical test, the ring knife is a standard soil sample preparation tool manufactured according to the water conservancy industry standard SL370-2006 "Geotechnical Test Instrument Ring Knife". It has a specified diameter, height, thickness, and edge angle. Can be used alone. Cooperating with geotechnical testing equipment, it can conduct penetration test, consolidation test, loess subsidence test and shear test. Used alone, it can measure the density of soil samples in water conservancy, transportation, construction and other engineering sites, calculate the degree of compaction, and evaluate the quality of engineering construction. Its shape and structure are as figure 2 As shown, it is composed of a ring-shaped ring cutter body 01 and a knife edge 02 at the lower opening ...

AI Technical Summary

Problems solved by technology

The existing method is that the inspectors manually use excavation tools and knocking tools, and it takes time and effort to take out the soil samples for inspection from the inner cavity of the ring cutter.

Adopting the method of the above-mentioned prior art, on the one hand, it is time-consuming and labor-intensive. Not only does the operation require greater labor intensity, but also it takes a long time to take out the soil sample for testing from the inner cavity of the ring knife, which seriously affects the testing work efficiency; on the other hand, testing personnel During the sampling process of manual use of digging tools and knocking tools, the ring knife is often deformed; the edge of the knife is curled or even damaged

Since the ring knife is a sampling measuring tool, its size must meet the standard regulations, and the deformed and damaged ring knife can only be scrapped and cause waste

[0004] There are also attempts to use an electric demoulding machine or a jack ejector to push the soil sample for testing out from the inner cavity of the ring cutter from bottom to top. Supporting the special equipment used to take out the soil sample from the ring knife, actually resulting in waste of equipment and energy for "big horse-drawn carts"

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