Design And Research On Fatigue Testing Machine With Heavy Shock Loads For Steel Rope And Bearing

The Steel Rope as a flexible object can be used to transmit and withstand the force. It is widely used in mining, transportation, ocean industry because of its high quality of strength and flexibility. In order to ensure its safety and reliability, it is necessary to test the capability of steel rope by using the testing machine. The simulation of traditional steel wire fatigue testing machine is to make a short testing-rope bend in one direction repeatedly, this operating mode is different from the actual, and therefore it is necessary to design a testing machine which can simulate the actual operating mode of the steel rope, then the quality and the service life of the steel rope can be accurately tested. The bearing work along with the steel rope, so it is necessary to design the lifetime testing machine to test it.The impacting fatigue testing machine of the steel rope and the fatigue life testing machine of the bearing are designed after their actual operation are analyzed. The machines and their hydraulic systems are developed, and the simulation of the hydraulic system is done to verify its feasibility. The thesis is organized as follows:In chapter 1, the history and current research status of the testing machines are introduced based on a lot of the publications. The general test methods of the impact or load test are analyzed. Consequently, the research and the goal of the project are brought forward.In chapter 2, the steel rope impact fatigue testing machine is designed based on the analyses of the rope's actual operating mode. The characteristics and the working principle of the testing machine are introduced. The impacter and support part are designed, and the related theoretical analyses are done.In chapter 3, the hydraulic system of the fatigue testing machine is developed. The working principle of the hydraulic system is introduced and its components are selected. The impacting time and the speed of the steel rope are analyzed.In chapter 4, the strength of the cross beam and the mounting panel are analyzed by using the finite element software Ansys. Mathematical models of the system are established in AMESim and the simulation is carried out. Simulation results show the hydraulic system can meet the specification.In chapter 5, the scheme design of the fatigue life testing machine for bearing and steel rope is done, the difficulties and the feasibility of the current scheme is analyzed. The hydraulic system of the machine is brought forward.In chapter 6, conclusions and further expectation of the project are given.