| Rotary drilling rig is a kind of construction facilities introduced into China in recent years. It is applied widely to the building project's stake foundation, such as Highway Bridge, high-rise construction, power plant, airfield, large-scale port, deep-water dock and so on. Cooperating with different drilling tools, it is used in many different kinds of holing works. Rotary drilling rig has big installing power, big output torque, large axial pressure, mobile work, high automatization, high construction efficiency, little pollute and so on. It adapts to the majority of soil geology conditions in our country. It represents the development direction of pile machinery. It is promising pile machinery.Rotary drilling rig is widely used only in recent years. The lack of product standards, technical training and systematic construction method brings on further study on the basic theory of rotary drilling rig. At present, foreign technology of this product has become mature, but the majority of domestic products only reach the level of the foreign products'in late 1980s. There is a big gap in the technological level of rigs between in and out of China. Therefore, in order to develop genuine products, which reach advanced international level, we still need to increase research investment.The tunneling support system studied in this paper is one of the key institutions of rotary drilling rig. In the whole structure of rotary drilling rig, it plays a role in supporting; adjusting the mast's working scope or the height of the mast in transportation state, angle with the ground, and the rapid translation adjustment aim at holes. At the same time it connects the mast and base, making a reasonable layout of whole machine and playing an important role in the stability of manipulation. Calculating and simulation analysis of the tunneling support system's kinematics and dynamic is a need to ensure the secure and efficient work of rotary drilling rig.The general movement of tunneling support system is that the mast tank operates first with its piston rod extending uniformly until working equipment has angle of some degrees with the ground; then the luffing tank operates until piston rod extends to some position; finally the mast tank continues to work with its piston rod extending to an appointed position.This paper analyzes the kinematics of tunneling supporting device with the analytical method and gives calculating equations of the hinge points'displacement, velocity, acceleration, and angle velocity and angle acceleration.With virtual prototyping technology used in the text, dynamic model is founded on the main structural parameters of tunneling supporting device on ADAMS software platform. Tunneling support system is two-degree-of-freedom system. In order that tunneling support system moves along the tracks, we must ensure that all bars move in order. We need add driver functions to Motions of two tanks to start kinematics simulation. The main purpose of simulation is to investigate kinematics and dynamic indexes of tunneling support system during the process of its adjustment and excavating, mainly hinge point angular displacement, velocity and displacement of the center of mass of every link. Element force on the hinge Anti point, pressure in luffing tank and mast tank, friction moment on the hinge Anti point are also measured in the course of the movement. Computer simulation of positioning adjustment and excavating not only reflects moving state of every bar, but also provides basis for tunneling support system in actual working condition. With the ADAMS software's powerful measurement and analysis functions, we can easily detect omnibus parameters of tunneling support system to do further analysis and evaluation of the relevant parameters. It is beneficial to the study of kinematics and dynamic, improvement ofthe structure and properties of tunneling support systems.In this paper, my work can be summarized as follows:1. According to the relevant parameters, its kinematics model and derived equations of kinematics in the analytical method were established.2. Parametric model of tunneling support system was set up on ADAMS platform .It can be used as the basis for simulation. Parametric modeling helps simulation, optimization and analysis of tunneling support system.3. Through simulation in ADAMS, excavation support device's working process was factually recurred during its adjustment of positioning and excavating. Data of kinematics and dynamic analysis that was given in can provide a theoretical basis for both actual work and further study of the excavation support device.Because of time limitations, boring support device model is disposed not subtly enough in the dynamic simulation process. If you hope that the simulation data can be more accurate, I propose extract driver system and transmission system of the boring support device from the whole model to form a single simulation module with a separate dynamic analysis. In dynamic analysis, effect of dynamic compensation was not reflected in the model, so the model needs further revision. In addition, correlative factors that were not considered in this paper will be one aspect of further work.Tunneling support system's dynamic analysis has important reference value for the study of dynamic characteristics, control theoretics and optimization of tunneling support system. This paper makes a detailed kinematics and dynamic analysis of rotary drilling rig with virtual prototyping technology. It improves the calculation's accuracy and efficiency. At the same time, it provides effective data for product design improvement .I believe that it will have significant economic benefits. |
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