10 m超大采高液压支架关键结构及其承载特性

Key structure and bearing characteristics of 10 m super large mining height support

  • 摘要: 针对10 m超大采高综采工作面围岩控制需求,研发了ZYA29000/45/100D两柱掩护式超大采高液压支架。阐述了超大采高采场围岩垮落及矿压显现特点,总结了10 m超大采高工作面注重顶板、煤壁防护及承受强动载的支护需求;在此基础上研发了10 m超大采高液压支架,给出液压支架结构关键参数,配套双层伸缩梁+三级协动护帮、ø630 mm大缸径抗冲击立柱等创新结构,具备断面全防护、结构抗冲击、架体自稳定等技术特点;以结构稳定性为切入点,在分析工作面倾角及采高对支架稳定性影响的基础上,研究了液压支架对不同工作面倾角及采高的适应性,分析得出支架横向临界倾倒角度为12°,适应采高7~10 m,液压支架在正常工作区域内,其理论支护效率并不会有较大变化,而掩护梁受载是超大采高液压支架与小采高支架的最大区别;针对两柱掩护式支架承载特点,分析了不同支架参数下顶梁力平衡承载区域及其迁移特性,两柱式掩护式支架力平衡区主要集中于立柱部位,立柱与顶梁铰接点位置的变化对力平衡区影响显著,平衡千斤顶参数的变化对力平衡区的影响有限;分析了不同型式护帮结构的煤壁防护性能,阐明双层伸缩梁+三级协动护帮结构在防护力度、防护面积等方面具有明显的优势;通过分析支架在增阻状态下的等效刚度,建立了液压支架动载力学仿真模型,通过模拟试验方法研究了其在“给定变形”工作状态下承受动态载荷的响应过程,得出顶梁承受动载主要通过立柱传递、掩护梁承受动载主要通过四连杆机构进行传递的特点;分析了支架在曹家滩煤矿122104工作面的使用情况,说明ZYA29000/45/100D对10 m超大采高工作面有较好的适应性,且满足工作面超大采高围岩控制需求。

     

    Abstract: ZYA29000/45/100D two column shield type hydraulic support was developed for controlling the surrounding rock of a 10 m high fully mechanized mining face. Elaborated on the characteristics of rock collapse and mining pressure manifestation in the super high mining face, and summarized the support requirements for roof and coal wall protection and bearing strong dynamic loads in the 10 m super high mining face; On this basis, a 10 m super large mining height hydraulic support was developed, which is equipped with innovative structures such as double-layer telescopic beams+three-level cooperative protection, and a ø630 mm large cylinder diameter impact resistant column, and the key parameters of the structure have been provided. It has technical characteristics such as full section protection, structural impact resistance, and self stabilization of the frame; Taking structural stability as the breakthrough point, the adaptability of hydraulic supports to different working face angles and mining heights was studied, and the critical lateral tilt angle of the support is 12°, which is suitable for mining heights of 7-10 m; The force - balance area of the shield beam of the super large mining height hydraulic support is proposed. It is considered that within the normal working area of the hydraulic support, its theoretical support efficiency will not change significantly, and the load on the shield beam is the biggest difference between the super large mining height hydraulic support and the small - mining - height hydraulic support. Based on the bearing characteristics of the two column shield support, the force balance bearing area and its migration characteristics of the top beam under different support parameters were analyzed. The force balance area of the two column shield support is mainly concentrated in the column part, the change in the position of the hinge point between the upright post and the crown beam has a significant impact on the force - balance area, and the influence of changes in the balance jack parameters on the force balance area is limited; analyzed the coal wall protection performance of different types of protective structures, and clarified that the double-layer telescopic beam+three-level cooperative protective structure has obvious advantages in terms of protection strength and protection area; by analyzing the equivalent stiffness of the support in the increased resistance state, a dynamic-load mechanical analysis model of the hydraulic support was established, and the response process of the support under dynamic load in the "given deformation" working state was studied. It was found that the dynamic load borne by the top beam is mainly transmitted through the column, and the dynamic load borne by the shield beam is mainly transmitted through the four-bar linkage structure; analyzed the use of supports in the 122104 working face of Caojiatan Coal Mine, and demonstrated that ZYA29000/45/100D has good adaptability to 10 m ultra high mining face and meets the control requirements of surrounding rock for ultra high mining face.

     

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