基于吸能材料的液压支架抗冲击特性试验研究

    Test study on impact resistance of hydraulic support based on energy-absorbing material

    • 摘要: 液压支架顶梁敷设吸能材料可以有效提高液压支架在瞬时动载冲击下的抗冲击性能。为了探求吸能材料对冲击载荷下液压支架抗冲击性能的影响,开展了基于吸能材料的液压支架抗冲击特性的试验研究。首先根据液压支架顶梁结构尺寸和吸能材料特性,确定了硅基应力速变敏感性吸能材料及其长、宽、高等相关几何参数;其次研制了液压支架落锤冲击试验台,设计了用于数据采集的压力传感器、红外传感器、数据采集卡以及高速摄像机的合理安装位置,开展了在液压支架顶梁敷设不同厚度吸能材料的液压支架落锤冲击试验方案设计;最后开展了基于吸能材料的液压支架抗冲击特性试验,对比分析液压支架受冲击时不同厚度的吸能材料对立柱位移、压力变化和响应时间的影响。试验结果表明:硅基应力速变敏感性吸能材料在18 ms内完全响应瞬时冲击,吸能材料吸收的能量占整体冲击功的32.7%;覆盖5层吸能材料的液压支架受到冲击时立柱下腔最大压力为35.8 MPa,比无吸能材料试验立柱下腔最大压力减少23%;冲击振荡时间为58 ms,比无吸能材料试验冲击时间延长48.7%;受冲击后吸能材料主体结构完好,体现其高敏感、强吸能、去峰消振和抗冲击破坏的特点;液压支架顶梁敷设合理厚度与尺寸的硅基应力速变敏感性吸能材料,可有效提高液压支架的抗冲击性能。

       

      Abstract: The application of energy-absorbing material on the top beam of the hydraulic support can effectively improve its impact resistance under instantaneous dynamic loading. In order to investigate the impact of energy-absorbing material on the impact resistance of hydraulic support, a test study based on energy-absorbing material were conducted to investigate the impact resistance characteristics of hydraulic support. First, based on the size and properties of the top beam structure and energy-absorbing material, the geometric parameters of the silicon-based stress-sensitive energy-absorbing material, such as length, width, and thickness, were determined. Second, hydraulic support drop hammer impact test rig was developed, and the reasonable installation positions of pressure sensors, infrared sensors, data acquisition card, and high-speed camera were designed for data collection. Finally, a test scheme was developed for the hydraulic support drop hammer impact test with different thickness of energy-absorbing material on the top beam. The impact resistance characteristics of hydraulic support based on energy-absorbing material were then experimentally investigated, and the effects of different thickness of energy-absorbing material on the leg displacement, pressure change, and response time were compared and analyzed. The test results show that the silicon-based stress-sensitive energy-absorbing material fully responds to the instantaneous impact within 18 ms, and the energy absorbed by the energy-absorbing material accounts for 32.7% of the total impact work. The lower chamber pressure of leg under the impact of the hydraulic support with five layers of energy-absorbing material is 35.8 MPa, which is 23% lower than that of the hydraulic support without energy-absorbing material. The impact oscillation time is 58 ms, which is 48.7% longer than that of the hydraulic support without energy-absorbing material. After the impact, the main structure of the energy-absorbing material was intact, demonstrating its high sensitivity, strong energy absorption, peak reduction, and impact damage resistance characteristics. Applying a reasonable thickness and size of silicon-based stress-sensitive energy-absorbing material on the top beam of the hydraulic support can improve the impact resistance.

       

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