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为解决混凝土泵送换向时负载突变和活塞撞缸引起主油泵出口液压冲击的问题,提出了混凝土泵送换向过程的变排量控制方法。在周期性突变负载工况下,基于混凝土泵的开环特性,综合考虑泵送油缸结构参数和主油泵排量控制时间参数,在满足活塞不撞缸的物理约束下以泵送时间最短为评价标准,建立混凝土泵送换向过程的优化模型。以某型号的混凝土泵为例,对泵送油缸变排量控制信号点的位置参数和主油泵变排量控制的4个时间段参数进行了优化,并分别以水和混凝土为泵送对象进行了仿真和试验分析。研究结果表明:采用变排量控制方法后,主油泵出口液压冲击大约减小了67%,且没有发生活塞撞缸现象;该方法为解决周期性突变负载下混凝土泵送开环控制系统的设计问题提供了一个新的工程化途径。
In order to solve the problem of the sudden change of load and the impact of hydraulic cylinder piston impact on the outlet of the main oil pump, the variable displacement control method of concrete pumping reversing process was put forward. Based on the open-loop characteristics of the concrete pump under cyclic catastrophic load conditions, taking into account the structural parameters of the pump cylinder and the displacement control time parameters of the main oil pump, the shortest pumping time Standard, the establishment of concrete pump reversing process optimization model. Taking a concrete pump of a certain type as an example, the parameters of variable position control of pumping cylinder and the parameters of variable speed control of the main oil pump were optimized, and the water and concrete were taken as the objects of pumping Simulation and experimental analysis. The results show that after the variable displacement control method is adopted, the hydraulic shock at the outlet of the main oil pump is reduced by about 67%, and the phenomenon of piston crashes does not occur. This method is to solve the design of open-loop control system of concrete pumping under cyclic abrupt load The problem provides a new way of engineering.