The flexible inner pressure bolt is a new kind and new structural bolt (anchor rod). A number of structural improvements and performance test have been carried out. The bolt has superior compatibility to the soft crag...The flexible inner pressure bolt is a new kind and new structural bolt (anchor rod). A number of structural improvements and performance test have been carried out. The bolt has superior compatibility to the soft crag and the large distortion tunnel with its flexibility. In order to study its stress, deformation and interaction mechanism thoroughly, a number of large distortion calcula- tions and analyses have been carried out on the bolt by FEM (finite element method), especially with the ANSYS software, based on the updated Lagrangian law. The results show that the maximum stress of the inner wall of the bolt is consistent with an elastic analytic solution. The maximum stress on the body occurs in the vicinity of the enhancement material. The link enhancement of the body seems to be quite essential. The experimental results indicate that the maximum injection pressure in the bolt is 2.5 MPa without link enhancement and 8.3 MPa with the enhancement. This link enhancement effect is highly significant. These results provide some basis for the design, application and anchoring stress analysis of the bolt.展开更多
针对转运系统转载物料过程中料斗衬板的磨损影响运输效率的问题,改用新型钢基陶瓷复合衬板来代替传统耐磨钢,采用离散元法(distinct element method,DEM)描述颗粒物料运动过程,通过Archard磨损模型分析预测不同工况条件下衬板磨损规律,...针对转运系统转载物料过程中料斗衬板的磨损影响运输效率的问题,改用新型钢基陶瓷复合衬板来代替传统耐磨钢,采用离散元法(distinct element method,DEM)描述颗粒物料运动过程,通过Archard磨损模型分析预测不同工况条件下衬板磨损规律,并通过磨损规律和磨损特征验证了磨损模型的合理性。基于DEM的有限元法(finite element method,FEM)耦合方法分析了衬板应力与变形特性。研究结果表明:料斗衬板的最大磨损深度随颗粒度增大而减小,随传送带带速、衬板安装高度、衬板安装倾角的增大而增大。结合实际来看,衬板在粒径25mm、带速2.8m/s、高度3000mm、角度60°的工况下磨损最小。铁矿石散料对衬板的摩擦和冲击作用造成的应力较大的位置主要集中在衬板连接的螺栓孔周围,磨损最严重的位置多为颗粒与衬板优先接触区域,因此,为了降低应力集中,应该在衬板连接处加强螺栓孔的强度并进行圆角设计。展开更多
基金Project 2004GG3204001 supported by the Science and Technology Development Plan of Shandong Province
文摘The flexible inner pressure bolt is a new kind and new structural bolt (anchor rod). A number of structural improvements and performance test have been carried out. The bolt has superior compatibility to the soft crag and the large distortion tunnel with its flexibility. In order to study its stress, deformation and interaction mechanism thoroughly, a number of large distortion calcula- tions and analyses have been carried out on the bolt by FEM (finite element method), especially with the ANSYS software, based on the updated Lagrangian law. The results show that the maximum stress of the inner wall of the bolt is consistent with an elastic analytic solution. The maximum stress on the body occurs in the vicinity of the enhancement material. The link enhancement of the body seems to be quite essential. The experimental results indicate that the maximum injection pressure in the bolt is 2.5 MPa without link enhancement and 8.3 MPa with the enhancement. This link enhancement effect is highly significant. These results provide some basis for the design, application and anchoring stress analysis of the bolt.
文摘针对转运系统转载物料过程中料斗衬板的磨损影响运输效率的问题,改用新型钢基陶瓷复合衬板来代替传统耐磨钢,采用离散元法(distinct element method,DEM)描述颗粒物料运动过程,通过Archard磨损模型分析预测不同工况条件下衬板磨损规律,并通过磨损规律和磨损特征验证了磨损模型的合理性。基于DEM的有限元法(finite element method,FEM)耦合方法分析了衬板应力与变形特性。研究结果表明:料斗衬板的最大磨损深度随颗粒度增大而减小,随传送带带速、衬板安装高度、衬板安装倾角的增大而增大。结合实际来看,衬板在粒径25mm、带速2.8m/s、高度3000mm、角度60°的工况下磨损最小。铁矿石散料对衬板的摩擦和冲击作用造成的应力较大的位置主要集中在衬板连接的螺栓孔周围,磨损最严重的位置多为颗粒与衬板优先接触区域,因此,为了降低应力集中,应该在衬板连接处加强螺栓孔的强度并进行圆角设计。
