Optimization Of Blast Furnace Tapping Machine Drilling Tool And Simulation Of Tapping Machine System

Higher requests to the blast furnace ironmaking technology and equipment were proposed to fit the rapid development in steel and iron industry of our country recently. Tapping machine and its drilling tool are the keys to the blast furnace ironmaking, their operation effect has direct impact to the safety of blast furnace production. At present, domestic steel manufacturers are faced with the important task of rebuilding and upgrading tapping machine from electic or pneumatic to the entire hydraulic. As well as the short lifespan, high cost and low efficiency of the drilling tool have always been the technical problems which puzzle the steel and iron industry in China. This research complies with the requirements of development in the steel and iron industry, and is dead against the technical problems of drilling tool and tapping machine existing in the practical production of the Jinan Steel and Iron Group, and aims to breakthough the technical bottleneck in drilling tool and tapping machine of the blast furnace, to enhance the production efficiency, reduce production cost and promote the development of iron and steel industry.This reaserch use theoretical research tool, virtual prototype technology and finite element method to complete the analysis and optimization design of driliing tool and tapping machine of the blast furnace.In this thesis, basic characteristics of blast furnace taphole clay such as the function requirements, raw materials allocated proportion, the physical and chemical properties etc. were analyzed. The structure characteristic of taphole clay and the strength theory about brittle material were studied. The destruction criterion of brittle material which is similar to concrete and suitable for taphole clay has been determined. The finite element model of clay in the blast furnace tap hole was built and its temperature field was then analyzed by using ABAQUS. Temperature contour of taphole clay was carried out, which made a foundation for stress analysis of drilling tool in the next stage.Virtual prototype model of the tapping machine and drilling tool system was built, dynamic simulation analysis with ADAMS was carried out, therefore the dynamic characteristics of the system were obtained. The drill bit stress was analyzed in theory and simulation. Different failure modes of the drill bit under normal temperature and high temperature were analyzed, the mainly reason of its failure at the process of opening taphole is that the drill edges falling off from the tank of bit body.A new tapping machine drill bit was designed according to the design criterion of rock drill on the basis of full consideration the failure reason of dill bit, and the preliminary scene examination was carried. The results indicated that the defect which the blade fell off under the high temperature would be overcomed through the adoption of this new drill. Its working efficiency was distinct enhanced and its cost was obvious reduced compared with original one.The drill rod working status of tapping machine was analyzed, and the reasons for the drill rod's transverse vibration were studied. The dynamic simulation research about the drill rod was carried out with ADAMS, and the dynamic characteristics of drill rod have been acquired. A solution for drill rod transverse vibration was proposed and optimized by using ADAMS. The simulation results of new plan show that the transverse vibration of the drill rod can be reduced effectively compared with original one.Virtual prototype model of the entire hydraulic tapping machine was built, and its dynamic simulation analysis was carried out. Force status of tapping machine and the maximum force in each constraint in the whole work process were obtained. The finite element analysis and the strenth check of each key element of the tapping machine were finished.