Optimization Design And Simulation Analysis Of TBM Airborne Bolt Drill

Bolt support technology is constantly developed and improved,bolt drill as a key construction equipment is also constantly updated.TBM airborne bolt drill is a new type of bolt drill structure which is produced according to the needs of engineering.The key point of product design is to find the most suitable structural form in the design of key components.Therefore,in view of the rationality and safety of the structure design,the research on the airborne bolt drill is carried out.The main contents of the paper are as follows:1.Based on the overall structural design scheme,working principle and key parameters of TBM airborne bolt drill,the design requirements and operating space requirements of airborne bolt drill were put forward,and the key component structure and operating conditions were analyzed.2.Based on rock breaking principle of bolt drill,the simulation model of drill-rock relationship was established by using ls-dyna module in ANSYS.Numerical simulation was carried out for the drilling process of four-tooth ball bit,and the change rules of the impact speed and the rock depth of the drill were obtained.According to the operating conditions of TBM airborne bolt drill,the results impact analysis of drilling process of drill bit was carried out by adjusting drilling parameters such as drilling Angle,impact energy,rotation speed and axial thrust,etc.,and the variation law of impact speed and penetration depth of drill bit under different parameters was obtained.3.The working space range and operating conditions of TBM airborne bolt drill should meet the layout design requirements of bolt reinforcement in the initial support of circular tunnel.According to the design scheme of bolt support system,the simulation calculation was carried out for the initial stage of TBM construction to verify the feasibility of the scheme.Then,according to the location of bolt hole,the working conditions of the bolt drill were determined.Through ANSYS static simulation,the stress distribution and deformation of the key components of the bolt drill under different working conditions were studied,so as to improve the design reliability of key drilling components.4.According to the force of the swing structure of the propulsion beam,the reason for the poor stress distribution was analyzed.Based on the sub-model,the parts that need to be optimized were cut out,and then,Topology Optimization design was carried out by using the Topology Optimization module of Workbench.According to the new topological structure and considering its design and manufacturing process,the new swing structure was obtained.By comparing and analyzing the stress distribution and deformation of the structure before and after the optimization,as well as the natural frequency under the modal analysis of the structure before and after the optimization,it was concluded that the static and dynamic characteristics of the structure after the optimization were significantly improved.