关键词: 转/分, 步进电机, 光敏二极管, 手动开关, 单脉冲, 数码管, 人工控制, 二段, 蜗轮蜗杆, 自动停机

Abstract: This apparatus can be used for direct rapid shear tests, relexation rheological tests, fatigue shear test, single impulse test etc., the movement of its shear box is automatically controlled by the step motor FBM-3D-009 of which the rare is divided into two ranges:1~90 and 110~360 circles per min, each being adjusted step by step. The adjustment of the shear displacement with precision up to ±0.01mm is reached by regulating distance between the two light-sensitive diodes. The shearing times within 1~9999 can be predetermined and displayed on digitrons one by one. If the shearing times are the same at the predetermined, shearing will stop automatically. Besides, the apparatus can be operated manually. In testing the shear displacement and the shear stresses are recorded automatically by means of the end instruments and the recording meter.