Flexible sanding device for cylinder rock specimen

A flexible sanding device for sanding a rock specimen in a shape of a cylinder, comprising:

• a base;
• a bottom sanding plate;
• four adjustable connecting rods;
• four elastic loaders;
• four connectors;
• four side sanding brushes;
• a top sanding plate;
• an inner rod;
• four prongs;
• and
• a drill rod;
• wherein a top of the drill rod is adapted to be fixedly connected with a rotating shaft of an external water drilling rig;
• the inner rod is coaxially connected with the drill rod;
• the four prongs are welded symmetrically around the drill rod;
• each of the four adjustable connecting rods is connected to each of the four prongs and is inserted into each of the four connectors;
• each of the four connectors is connected to each of the four side sanding brushes;
• each of the four elastic loaders is arranged between one of the four adjustable connecting rods and one of the four connectors;
• the four side sanding brushes are arranged around the rock specimen and configured to sand a lateral surface of the rock specimen;
• the top sanding plate is connected with the inner rod through a high-strength spring and is configured to sand a first end surface of the rock specimen;
• the bottom sanding plate is fixed at a center of the base and is configured to sand a second end surface of the rock specimen;
• and
• four convex grooves are evenly distributed on the base.