Structural Design And Research Of The Underground Pipeline Digging Machine

With the speeding up of urbanization and the increasing of municipal construction in our country, urban pipeline network planning often can’t keep up with the needs of the urbanization process. The road just paved soon would be clawed to lay new underground pipelines due to the need of municipal construction. Although the trenchless technology has gradually replaced the traditional "dredging pipe laying method", no excavation construction technology started relatively late in our country. Today, our country often need to imported trenchless equipment because of some major projects. We all know that the imported trenchless equipment not only expensive, but also cannot satisfy the actual working condition of the domestic. Therefore, the new non-excavation equipment has been needed for municipal construction of urban civilization, which designed with independent intellectual property rights, simple, inexpensive, reliable, green and suiting for the actual working conditions.This article from the actual engineering conditions, combined with the domestic and international trenchless technology, the application of the principle of bionics, guided with the most representative of the shield machine, pipe jacking machine and horizontal directional drilling rig.we put forward a model of small caliber (diameter 500mm) underground pipeline digging machine, which can walk on oneself and without destroying roads and buildings. The machine is mainly composed of a cutter cutting system, self-propelled system, dregs transportation system, detection and control system composition, which can lay a variety of underground pipelines without excavating the surface, such as drainage pipeline, gas pipeline and communication cable and so on. In order to find out the main factors affecting the cutter cutting load, the three-dimensional entity model is established by 3D design software Solidworks and the finite element analysis software (ABAQUS) was used on the cutter cutting system for 3D dynamic simulation analysis. A self-propelled system was designed base on the principle of bionics, which not only can realize self-driving forward also can implement rectification mining direction. The sediment transport system is mainly composed of screw conveyor and a transport trolley towed with a steel wire rope. Detection system combined with laser guidance technology and video monitoring technology. Control system adopts hydraulic control technology and PLC control technology. So that the machine can complete the excavation of underground pipes, waste soil transport and display the status of underground work under the condition of itself.In this paper, the cutter cutting system, waste soil transport system and walking system has carried on the preliminary design and study. In order to improve the cutter’s cutting efficiency, lower the spindle power, reduce the load of parts and extend the life of the cutter, there put forward a new kind of driving cutting system which contain double plate and can work step by step. At the same time, in order to reduce the forward resistance of the machine and prevent the collapse of the hole wall, extrusion and reamer design was used on the outer cutter. The new type of waste soil transport scheme can convey the waste soil cut down by the cutter to the ground efficiently. This article lay a solid foundation for the further expand and depth of the topics. This also has important significance for the underground piping trenchless technology for the further research and application.