2 results about "Scratch hardness" patented technology

A feeder system (1) for use in a mold comprises a sleeve (2) and a breaker core (3). One or more retaining elements (21, 31) are positioned on the sleeve (2) and / or the breaker core (3), and these retaining elements (21, 31) support the breaker core (3) on the sleeve (2). The retaining elements (21, 31) are adapted to interact with the other of the sleeve (2) and the breaker core (3) to which each retaining element (21, 31) is not attached, in such a manner that the breaker core (3) can be displaced inside the sleeve (2). The breaker core (3) is made from an insulating material having a scratch hardness higher than that of the sleeve (2). The breaker core (3) is made from core shooting, and the sleeve (2) is made from slurry formation.

The application discloses a novel method and corresponding measuring device for rapidly measuring key mechanical parameters of rock, including scratch hardness, Brinell hardness, Young's modulus and Mohr-Coulomb parameters (uniaxial compressive strength and internal friction angle). The equipment system comprises a portable frame, which contains a set of horizontal linear driving equipment, equipped with a set of linear encoders for accurately measuring horizontal displacement; the vertical direction contains a set of servo vertical driving equipment, equipped with a set of incremental magnetic encoders for accurately measuring vertical displacement, and a set of linear variable differential transformers (LVDT) for accurately sensing the slight concave-convex fluctuation of the rock surface; the servo motor drives the hemispherical composite piece through a screw rod; the size of the force in the horizontal and vertical directions of the scratch is measured by a bidirectional force sensor installed above the composite piece. The horizontal linear motor and the vertical servo motor are both loaded at a uniform speed; according to the size of the measured force, the scratch hardness and the Brinell hardness of the rock can be calculated; according to the theoretical solution of the slip line field hemispherical tooth, the Mohr-Coulomb parameters of the rock, including the uniaxial compressive strength (or cohesive force) and the internal friction angle, can be inversely calculated. When the vertical servo motor is loaded alone, the Brinell hardness of the rock can also be calculated; the Young's modulus can be calculated by the stiffness during unloading.