Design, Simulation And Optimization Of GWT-300 Geo-physical Blast Hole Drill

As the demand of the mineral resources increasing,the seismic exploration technology has been developed.In seismic exploration process,the blast hole has to be constructed.The quality of the blast hole affects the effect of the seismic exploration directly. Therefore,the drill requirements of the geo-physical blast hole are increasing. According to the working mode, the basic structure and design features of GWT300 geophysical blast hole drill,the thesis puts forward the basic criteria of the design, combines traditional design methods with Modern design methods to analyze different kinds of the important structures. The major contents in the thesis are listed as follows:(1)Design the overall structure of the rig. The rig adopts wheeled vehicle,hydraulic pressure and electricity control, so that the rig has a good off-road performance and is easy to operate. Introduce the power head,the drilling mast and the gripper which have the greatest force and the most problems latent. Choose the pneumatic reverse circulation with double wall as the way of drilling.It can make the applications of the rig more flexible,so the rig can work in a variety of complex terrain.(2)When the rig works,it mainly relies on the gear of the power head to transform the torque from hydraulic motor to the spindle.Then the spindle whirls to complete Drilling. Therefore, the gear in the power head has a large engagement force in the drilling process so that it is prone to be damaged. In order to ensure the normal use of the rig, the stability of the gear in the power head is particularly important. In the thesis, ANSYS software is used to analyze the bending stress of the power head gear, and come to the bending stress values of the gear. The location where bending stress is the largest can also be known.Compared with traditional computing, Finite element analysis is much easier and more efficient.It provides an important reference for the checking and the design of the gear.(3) To improve the rig drilling capacity,the stroke of the power head become longer.So the length of the drilling mast is increasing.In the drilling process, the drilling mast may have a resonance phenomenon because of many kinds of excitations.So this requires to assess the dynamic performance of the drilling mast. The modal analysis of the drilling mast is made by the ANSYS software and getten one to ten vibration modes and natural frequency. Compared to the frequency of the excitation source, the first natural frequency of the rig are bigger.So there is no resonance phenomenon when the rig is working. Harmonic response analysis of the propulsion system is made to understand the response of the rig in different excitation frequency. In order to reduce the amplitude of the amplitude,the corresponding excitation frequency should be avoided.(4) For the structural requirements, economic and other factors , the design of the structure of the rig is needed to be optimized. ANSYS software is used to make the structural optimization for the rig gear shaft of the drill. The radius of the gear shaft is selected as the design variables,the stress as the state variables, the volume as the objective function to achieve the purpose of reducing the size of the gear shaft. After optimization, the volume of the geae shaft is significantly reduced.At the same time, the gear shaft meets the stress requirement. The modal of the structure is analyzed before and after optimization. Contrast to the four mode shapes and natural frequency, the natural frequency increased of the gear shaft reduce and the amplitude is found out. Therefore,the resonance phenomenon may happen in some other structure. When optimizing the structure whose the excitation frequency is close to the natural frequency,more attention should be paid to choose the best results.Through analysis with ANSYS software, the performance of the drill structure can be better understood and it provide a reference for the improvment and optimization of the drill.