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国内不少单位曾针对手动应变控制式直剪仪人工施加剪切应变,剪速不易均恒,影响读数精度;操作通常需要两个人等特点,将其改成电动施加剪切应变的仪器。但一般都采用较大的马达和减速机构,或数台仪器共用一台马达和减速机,这样不易做到设计小巧、紧凑、操作灵便。我们的做法是采用一台仅10瓦带减速器的仪表马达,加工一套(三个)小模数的变速齿轮,就能使仪器具有三种快剪或固结快剪的规定速率(4～12转/分钟)。变速齿轮的被动轮固定于加长了的原手轮蜗轮轴的端部,主动齿轮固定在电机轴上,电机靠一块用旧钢板加工成呈T型的机架就位于手轮蜗杆轴的平行位置,
Many domestic units have manual shear force for the direct shear shear strain control device, shear rate is not easy to constant, affecting the reading accuracy; operation usually takes two people and other characteristics, it will be changed to electric shear strain instrument. But generally use a larger motor and deceleration mechanism, or a number of instruments sharing a motor and reducer, so easy to do compact, compact, flexible operation. Our approach is to use a 10-watt gauge motor with a reducer and a set of three small module speed gears to give the instrument three defined rates (4 ~ 12 revolutions / minute). The driven gear of the speed change gear is fixed on the end of the elongated original hand wheel worm gear shaft, the driving gear is fixed on the motor shaft, and the motor is located on the parallel position of the hand wheel worm shaft by a steel plate machined with the old steel plate ,