摘   要：压碎指标用于衡量石子在逐渐增加的荷载下抵抗压碎的能力，是评定石子在建筑工程中适用性的重要力学性能指标。针对石子压碎指标值测定试样制备过程存在的不足，设计并研制了一种普通混凝土用石子压碎指标值测定试样制备装置。通过自动化机电控制方式，利用PLC控制器来控制和驱动电机来完成整个试验样品制备过程，一定程度上可减少试验人员的体力劳动的工作量，也可减小因经验不足或操作水平低而产生试验数据误差概率

Abstract: The crushing index is used to measure the ability of gravel to resist crushing under increasing load, which is an important mechanical performance index for assessing the applicability of gravel in construction engineering. Aiming at the deficiency in the preparation process of the gravel crushing index values, a kind of specimen preparation device for the measuring of the crushed index values of regular concrete was designed and developed. By means of automatic electromechanical controlling, utilized PLC controller to control and drive the motors to complete the whole process of sample preparation, the workload of manual labor of the tester can be reduced to a certain extent. It can also reduce the error probability of experimental data due to lack of experience or low level of operation.