| In the underground tunnel construction operations, tunnels are excavated in areas of weak or difficult ground, So pipe roof method is invented, which is playing an important role in the process of passing through the soft ground. However, there is no special facility for the construction of pipe support, the workers are often operating with substitute equipments, which is inefficient and insecurity. The price of the special pipe roof drill imported from foreign country is very high, so the number of rigs is very small, which can't meet the needs of the construction.This paper has given a detailed statement of the pipe roof drill's present developing situation, and analyzed the rigs at home and abroad. Aiming at the disadvantaged and deficiency of pipe roof drill's hydraulic system, the paper carried out the design and simulation of hydraulic system. The main content is as follows:(a) This paper has given a detailed analysis of the method of drilling of pipe roof dril,body movement,load characteristics and the feature of typical hydraulic control system, then put forward the requirement of drilling for the design of hydraulic control system.(b) Designed the hydraulic control system of the rig, and focused on analyzing the power pack rotating hydraulic circuit,the drill pipe feeding hydraulic circuit,the chassis walking hydraulic circuit and pump water circuit. Selected two load-sensitive pumps by calculating and analyzing, which is used in the core circuit.(c) The traditional hydraulic system design method is only steady-state analysis, without enough dynamic control process. In this paper, with the help of hydraulic software—AMESim, created the rotating hydraulic circuit and feeding hydraulic circuit simulation model controlling. The main parameters of the model of the hydraulic system were set; and then the dynamics simulation of the hydraulic system was achieved, the simulation results indicated that the load-sensitive control system can meet the needs of construction. |
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