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目前混凝土搅拌站称重控制系统主要采用放料阀门开度控制,由于物料口大小、物料颗粒大小不均以及物料与料斗间距离变化等均会造成物料称重的误差较大,对混凝土的混合比例误差大,从而对混泥土强度质量和凝固时间有很大的影响,本系统采用时间误差控制的原理,PLC作为控制核心,同时结合HMI实现人机交互,有效地解决了称斗称重系统中的误差问题,提高了称重系统的计量精度,改善混泥土的混合比例,也提高了系统的抗干扰性能。经实践应用,系统运行稳定可靠,提高了物料称重精度以及混凝土的强度质量,并确保了凝固时间。
At present, the weighing control system of concrete mixing plant mainly adopts the opening control of the discharge valve. Due to the size of the material mouth, the uneven size of the material particles and the change of the distance between the material and the hopper, the error of weighing the material is large, The proportion of errors, and thus the strength of concrete strength and solidification time has a great impact, the system uses the principle of time error control, PLC as the control center, combined with HMI to achieve human-computer interaction, effectively solve the weighed weighing system In the error, improve the measurement accuracy of the weighing system to improve the mixing ratio of concrete, but also improve the anti-jamming performance of the system. The practical application, the system is stable and reliable, improve the material weighing accuracy and the strength of concrete quality, and to ensure the solidification time.