下运带式输送机断带抓捕液压缓冲系统研究

Research on hydraulic buffer system of broken belt catch for downward belt conveyor

为有效吸收下运带式输送机断带抓捕过程存在的冲击,提出了一种下运带式输送机断带抓捕液压缓冲系统,分析了系统工作原理,基于AMESim建立了系统仿真模型,仿真分析了溢流阀开启压力、液压软管通径及长度、蓄能器气囊容积及充气压力对液压缸位移及液压缸有杆腔压力的影响规律。仿真结果表明,溢流阀开启压力越大,液压缸位移越小,液压缸有杆腔压力峰值越大;液压软管通径越大,液压缸位移越大,液压缸有杆腔压力峰值越小,但当液压软管通径增大到一定程度,其对液压缸位移的影响程度减小;液压软管长度越大,液压缸位移和有杆腔压力峰值越小;蓄能器气囊容积越大,液压缸位移略有减小,液压缸有杆腔压力峰值无变化;蓄能器充气压力越大,液压缸位移略有增大,液压缸有杆腔压力峰值基本不变。

In order to effectively absorb impact existed in broken belt catch process of downward belt conveyor, a hydraulic buffer system of broken belt catch for downward belt conveyor was proposed. Working principle of the system was analyzed, and a simulation model of the system was established based on AMESim. The influences of opening pressure of relief valve, diameter and length of hydraulic hose, bladder volume and charge pressure of accumulator on displacement and rod cavity pressure of hydraulic cylinder were simulated and analyzed. The simulation results show that the larger the opening pressure of relief valve is, the smaller the displacement of hydraulic cylinder is, and the larger the rod cavity pressure peak of hydraulic cylinder is. The larger the hydraulic hose diameter is, the larger the displacement of hydraulic cylinder is, and the smaller the rod cavity pressure peak of hydraulic cylinder is. However, the influence of hydraulic hose diameter on displacement of hydraulic cylinder decreases when hydraulic hose diameter increases to a certain value. The longer the hydraulic hose is, the smaller the displacement and rod cavity pressure peak of hydraulic cylinder are. The larger the accumulator bladder volume is, the smaller the displacement of hydraulic cylinder is, and rod cavity pressure peak of hydraulic cylinder is unchanged. The larger the accumulator charge pressure is, the larger the displacement of hydraulic cylinder is, and rod cavity pressure peak of hydraulic cylinder is basically unchanged.