液压支架初撑力手动增压装置设计与应用

Design and application of manual pressurization device for initial support force of hydraulic support

针对液压支架初撑力不足导致的工作面顶板过早离层、切顶线前移和煤壁片帮等安全问题,设计了一种液压支架初撑力手动增压装置。该增压装置与原升架液压系统的液控单向阀并联,在不影响正常升架的前提下通过手动操作补液增压,提高支架初撑力。对应用手动增压装置前、后的增压控制回路进行AMESim建模及仿真,通过对比分析发现,手动增压装置的增压效果明显;在某煤矿工作面ZY8500/21/45D型支架上进行现场试验验证液压支架初撑力的增压情况,结果表明,该手动增压装置能够显著提升支架初撑力,满足煤矿开采需求。

In view of safety problems such as premature separation of roof, advance of cutting line and rib fall of coal wall caused by being lack of initial support force of hydraulic support, a manual pressurization device for initial support force of hydraulic support was designed. The pressurization device is in parallel with hydraulic check valve of original support lifting hydraulic system, improves the initial support force through manual operation of pressurization under the premise that normal lift is not affected. AMESim modeling and simulation of the pressurization control circuit before and after applying the manual pressurization device were carried out. The simulation results show that the manual pressurization effect of the device is obvious. The field test result of pressurized situation for initial support force of ZY8500/21/ 45D type support on a coal mine working face shows that the manual pressurization device can significantly improve initial support force of the support and meet the coal mining demand.