Research And Development For The Subway Tunnel Wall Drilling Equipment

Subways develop rapidly in recent years. It mostly adopts top rigid catenary method to supply power, and it has much advantages. To start with installation need to drill at the top of the Subway tunnel, and Subway side wall safe evacuation platforms, pipelines and the installation of the cable also need to drill. Traditionally use the manual drilling, and some auxiliary machineries are so few functional, low efficiency that can’t adapt to the rapid development of subway construction. The top and side wall drilling equipment scheme is discussed in this paper. It also analyzes common design schemes, points out their advantages and disadvantages, then researches and develops multidirectional drilling equipment. It drills four holes one-time to the top or side wall of the tunnel has high speed, high precision, six degrees of freedom and less labor intensity. Through the photoelectric encoder on the wheel, laser measuring instrument, the tunnel section instrument and other equipments measure displacement and angle, etc.XY distance adjustment platform are installed at the bottom of the facility. Elevator, pitching and roll mechanism respectively achieve movement of Z axis, rotation of X and Y axis. Slewing bearing realize the rotation of Z axis. So it can complete six degrees of freedom in high precision. The equipment chose electric cylinder, linear bearings, linear guide, ball screw and other excellent parts, and these parts are calculated and selected. Rig platform consists of a set of rectangular hollow section steel. There are two slots on the drilling rig floor, so the spacing of the drills can be stepless adjustment and it is suitable for various installation specifications. The steel structure manual control platform is designed according to the national standards. Diamond drilling machine drill large diameter hole and is clean, sanitation, less damage to drilling tool, and less labor intensity.There are large resistance, resistance moment and vibration of the asynchronous motor to Rig platform when it is working. This paper calculate external load and build 3D model of the equipment by Solidworks, transform format into Hypermesh, then get high quality grid. Importing the high precision grid to the Workbench which has good man-machine interface to run static, modal and harmonic response analysis of drill platform by finite element analysis. The simulation results show that the drilling rig platform strength and stiffness meet the requirements and has high reliability, avoid the excitation frequency, and resonance will not occur. Optimizing shaft parts by using the Workbench multi-objective driven optimization technology to provide reliable reference for the design.Choosing low price, powerful S7-200 SMART via Ethernet network S7 protocol communication compose control system. Master-slave station control is simple to programme and easy to manage. The conventional PID control parameters are fixed, so it cannot adapt to the complex tunnel environment. Its system and control ability also are poor, so choose the fuzzy PID controller. Work-feeding system is modeled, simulated and analyzed by using fuzzy control toolbox of MATLAB/simulink software. Fuzzy PID control parameters self-tuning optimization are done too. SMART LINE which is exclusive touch screen of S7-200 SMART is used as man-machine interface. There are automatic control and manual control systems.