A side grinding device for a cylindrical rock test piece and its application method

Abstract

The invention provides a grinding device for the side of a cylindrical rock specimen and a method for using the same. The grinding device includes a base, a stable support, a clamping column and a grinding rod. A motor and a limit expansion rod are arranged in the base. The entire device is supported and fixed by a stable pillar, and the clamping pillar is fixed between the bases for firmly clamping the rock specimen. The grinding rod is evenly arranged around the clamping pillar for grinding the side of the rock specimen. The method includes clamping the rock test piece, installing a grinding rod, adjusting the position of the rock test piece, grinding the rock test piece, and picking up the rock test piece. The side grinding device for the cylindrical rock test piece and the use method thereof in the present invention are not easy to damage the rock test piece , practical and efficient, with a high success rate of production, and can be ground at one time to produce rock specimens with precise diameter and smooth surface, which lays the foundation for laboratory rock mechanics tests and is of great significance to the prevention and control of mine disasters.

Description

technical field [0001] The invention belongs to the technical field of rock mechanics test devices, and in particular relates to a grinding device for the side of a cylindrical rock test piece and an application method thereof. Background technique [0002] China is a country short of oil, low in gas, and rich in coal. Coal accounts for more than 90% of the total proven fossil energy resources in China. It is the most stable, economical, and self-guaranteed energy source in China. For a period of time, the status of coal as the main energy source will not change. By 2050, coal will still account for 50% of China's energy consumption. With the increase in the intensity and depth of coal mining, mine disasters will become more frequent and serious. Laboratory rock mechanics tests such as compression resistance and Brazilian splitting are important research methods for predicting and controlling mine disasters. Cylindrical rock specimens are the most widely used research object...

AI Technical Summary

Problems solved by technology

[0002] China is a country short of oil, low in gas, and rich in coal. Coal accounts for more than 90% of the total proven fossil energy resources in China. It is the most stable, economical, and self-guaranteed energy source in China. For a period of time, the status of coal as the main energy source will not change. By 2050, coal will still account for 50% of China's energy consumption. With the increase in the intensity and depth of coal mining, mine disasters will become more frequent and serious. Laboratory rock mechanics tests such as compression resistance and Brazilian splitting are important research methods for predicting and controlling mine disasters. Cylindrical rock specimens are the most widely used research objects for these rock mechanics tests. The size has high precision requirements. For example, the uniaxial compression test requires the specimen size to be 50mm*100mm, and the Brazil splitting experiment requires the specimen size to be 50mm*25mm. More than 0.3mm, but cylindrical rock specimens are mostly obtained from mines or other engineering sites by drilling and coring with drilling rigs. Due to the influence of engineering site coring equipment and geological conditions and other factors, the cores generally cannot meet the requirements of the laboratory. Standards are required, especially the diameter of the rock core is generally large. In addition, the surface of the rock core is relatively rough, so it needs to be further processed and polished to make a specimen that meets the requirements of the laboratory test. The height and dimension of the cylindrical rock specimen required for the laboratory test can be It is obtained by cutting the core, and its end face is flat, so it is relatively easy to grind, but the diameter of the rock specimen required for the test cannot be completed by simply cutting the core, and the side of the cylindrical specimen is curved, so it is difficult to grind. Obtain rock specimens with a diameter that meets the test requirements. At present, the rock cores obtained on-site are mainly drilled twice through the laboratory rock drilling and coring machine. After obtaining the rock specimens with the target diameter, the surface of the specimens is artificially Grinding, although this method can realize the production of cylindrical rock specimens in the laboratory, there are mainly the following shortcomings in the secondary drilling of cores by the laboratory rock drilling and coring machine

[0003] (1) The coring machine fixes the test piece by clamping the lower end of the test piece. The core machine works to generate a large vibration, the end of the drill bit contacts with the test piece to generate a large force, and the side arc surface of the test piece makes the test piece The contact area with the fixture of the coring machine is small, which cannot ensure that the specimen is fully and stably clamped, and it is easy to cause the specimen to shake, damage or even fall over, resulting in the failure of coring

[0004] (2) Drill sticking is easy to occur when drilling the test piece, which not only makes the test piece stuck in the drill bit and is not easy to be taken out, but also causes the test piece to be twisted and damaged

[0005] (3) After the test piece is successfully drilled, the surface of the test piece is often still uneven, and it is necessary to use sandpaper or a cutting machine to polish the test piece. The workload is heavy and it is easy to have a great impact on the dimensional accuracy of the test piece

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