液压支架动作过程用液需求分析
Analysis of Fluid Requirements Adapted to Various Process Actions of Hydraulic Supports
张占东 1陈吉顺 1李珂 1赵文超 1韦春辉1
作者信息
- 1. 山西大同大学机电工程学院,山西大同 037003
- 折叠
摘要
液压支架智能稳压供液技术及其供液流量与压力动态匹配方法是大型煤机装备智能化发展的方向之一,而支架在执行各工艺动作过程中的用液需求分析与预测则是重要的理论基础.基于对综采(综放)工作面"三机"协同作业模式的分析,以液压缸运动方程、支架液压阀阀口流量方程及液压介质连续性方程为基础,建立支架在执行"降柱-移架-升柱-推溜"4类基本工艺动作时的用液需求预测模型;以ZF17000/27.5/42D型液压支架为原型搭建了仿真模型,以液压缸运动速度最高、系统压力波动最小为目标得到了支架完成上述4类动作过程中的最优供液量.研究结果表明:液压支架在完成各工艺动作过程中的用液量与支架供液系统压力差、液压缸结构参数以及操作阀性能参数有关.
Abstract
The intelligent fluid supply with steady pressure technology of hydraulic supports and its dynamic matching method be-tween flow rate and pressure is considered as one of the directions for the intelligent development of large-scale coal mining equipment,and the analysis and prediction of the fluid requirements during the various process actions of the hydraulic supports are the important theoretical foundations.Based on the analysis of the three machines collaborative operation mode in the fully-mechanized coal mining face and the fully-mechanized top-coal caving face,the motion equation of the hydraulic cylinder,the flow equation of the hydraulic valve,and the continuity equation of the hydraulic medium were used as the basis to establish a hydraulic demand prediction model for the support when executing four basic process actions of"lowering cylinder,moving supports,lifting cylinder,pushing conveyor";a sim-ulation model was built based on the ZF17000/27.5/42D hydraulic supports,the optimal fluid supply value for the supports during the above four types of actions was obtained with the goal of achieving the highest cylinder movement speed and minimizing the pressure fluctuations.The results show that the fluid requirements of hydraulic supports in completing various process actions are related to the pressure difference between the inlet and outlet of the fluid supply system,the structural parameters of the hydraulic cylinder,and per-formance parameters of the hydraulic valves.
关键词
液压支架/稳压供液/用液需求/按需供液Key words
hydraulic supports/fluid supply with steady pressure/fluid requirements/fluid supply according to demand引用本文复制引用
出版年
2024
NETL
NSTL
万方数据