摘要
针对煤矿井下瓦斯抽采钻孔需人工下入封孔器并注入封孔料完成封孔,封孔工艺自动化程度低,研发煤矿井下瓦斯抽采钻孔三段式自动封孔器,其外形尺寸与钻杆相仿,可被自动钻机下入钻孔,并可实现自动注入封孔料。采用有限元分析的方法,选用Mooney-Rivlin超弹性本构模型表征应变能函数,获取封孔器动密封机构橡胶密封圈的受力情况,并获得不同材料封孔器胶套在不同膨胀力作用下的膨胀情况,为动密封机构滑动推动力数值的确定和胶套材料的选择提供参考;采用理论计算的方法对工作状态下三段式自动封孔器的流道进行水力计算,获得三段式自动封孔器封孔用水的流量和压力,为自动封孔参数的确定提供参考;利用有限元分析的方法校核封孔时封孔器储液腔的受力情况,分析三段式自动封孔器核心部件结构设计合理性,确保封孔器正常工作。制作实验样机,开展三段式自动封孔器室内封孔实验和封孔效果对比实验。室内封孔实验显示封孔器动密封机构动密封效果良好,封孔料自动注入模拟钻孔中,天然橡胶胶套自动膨胀充满模拟钻孔且可有效封堵封孔料,三段式自动封孔器具有可行性。封孔效果对比实验显示,自动封孔器封孔效果与现有的聚氨酯压注法工艺封孔效果相近,且优于传统的聚氨酯缠卷法工艺封孔效果。三段式自动封孔器可降低煤矿工人劳动强度、提高封孔效率、规范封孔流程,为煤矿井下瓦斯抽采钻孔自动封孔工艺和装备的研究提供参考。
In view of the requirements of hole sealing during gas extraction drilling in underground coal mine for manual packer installation and sealing material injection,as well as the low automation level of hole sealing technology,a three-stage automatic hole packer for gas extraction drilling in underground coal mine was developed,with the appearance similar to the drill pipe.The hole packer could be mechanized into the drilling hole by an automatic drilling machine,and realize the automatic injection of sealing material.Herein,the Mooney-Rivlin hyperelastic constitutive model was used to represent the strain energy function by the finite element analysis method.Thereby,the stress of the rubber seal ring under the dynamic sealing mechanism of the hole packer,and the expansion of the rubber sleeve of different rubber materials under different expansion forces,were obtained,thus providing a reference for the determination of the sliding force value of the dynamic sealing mechanism and the selection of the rubber sleeve material.Using the method of theoretical calculation,the hydraulic calculation was carried out for the flow channel of the three-stage automatic hole packer under working conditions.In this way,the water flow and pressure of the three-stage automatic hole packer were obtained,which provides reference for the determination of automatic hole sealing parameters.Besides,the stress of the liquid storage chamber of the hole packer was checked with the finite element analysis method,and the rationality of the structure design of the core components of the three-stage automatic hole packer was analyzed to ensure the normal operation of the hole packer.In addition,the experimental prototype was made,and the laboratory sealing experiment and the sealing effect comparison experiment were carried out with the three-stage automatic hole packer.The laboratory sealing experiment shows that the dynamic sealing mechanism of the hole packer has good sealing effect,the hole sealing material is automatically injected into th
作者
王清峰
史书翰
辛德忠
陈航
张世涛
WANG Qingfeng;SHI Shuhan;XIN Dezhong;CHEN Hang;ZHANG Shitao(China Coal Research Institute,Beijing 100013,China;China Coal Technology and Engineering Group Chongqing Research Institute,Chongqing 400039,China;State Key Laboratory of The Gas Disaster Detecting,Preventing and Emergency Controlling,Chongqing 400037,China)
出处
《煤田地质与勘探》
EI
CAS
CSCD
北大核心
2023年第9期147-155,共9页
Coal Geology & Exploration
基金
国家重点研发计划项目(2022YFB4703600)。
关键词
瓦斯抽采
自动封孔
结构设计
两堵一注
聚氨酯封孔
煤矿
gas extraction
automatic hole sealing
structure design
two plugging and one injection
polyurethane sealing
coal mine
