Study On Mechanical Performance Of H-steel Rail Connection Substructure Of New Type Coal Mine Monorail Crane

Coal mine monorail crane auxiliary transportation is an important mechanical equipment that maintains the sustainable development of coal mines and improves coal mine transportation efficiency.According to incomplete statistics,nearly 20 billion tons of materials and equipment need to be transported in coal mines in my country each year,of which more than a quarter are completed by the monorail crane auxiliary transportation system.However,the monorail crane auxiliary transportation has many accidents such as overturning of the suspended roof and broken suspension points every year.Therefore,It is of great significance for the development of coal mine monorail crane auxiliary transportation to continuously improve the suspension mode of monorail crane track and improve the quality of track installation.In this paper,a new type of suspension method of H-steel track connection for coal mine monorail crane is designed,and the solid element finite element model of the node substructure is established to study the mechanical performance of the node under static load.Through the analysis of the failure mode,limit of the node In terms of load,resistance mechanism and the percentage of bending moment transmission at the end of the node,etc.Study the bearing capacity of the node,the force process and the conversion process of the force mechanism,and perform variable parameter analysis on the node,study the thickness of the T-piece flange and the thickness of the T-piece web And the number of bolts affect the performance of joints.Furthermore,The natural frequency and mode mode of the rail system are studied.The effectiveness of the equivalent connection region of bolt is verified by the experimental data.Studies have shown that the thickness of the flange and web of the T-piece has a certain influence on the failure mode of the node.Increasing its thickness can make the damage position not in the core area of the node;the thickness of the web of the T-piece and the number of bolts have a limit on the node.When the thickness of T-shaped web is less than 20 mm,increasing the thickness of T-shaped web can increase the ultimate load of the joint and reduce the deflection of the track,while the thickness of T-shaped flange has little effect;in the node elastic stage,the end of the node can transmit 24% of the bending moment value.Then,propose reasonable suggestions on the dimensions of various parameters of the H-section steel-track connection node.Compared with the traditional suspended joint,the new joint proposed in this paper achieves the purpose of strengthening the core area of the joint,and the bearing capacity is increased by 2.7 times;The out of plane stiffness of the track is small,and out of plane bending and torsion instability should occur;The excitation frequency of the trolley running on the track is too small to cause the track resonance.