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With China's high-speed heavy rail accelerated pace of rail welding quality have become increasingly demanding . Pressure welding of rail track small CNC machine because welding time low input costs, lighter weight , small size, job flexibility and are widely used. However, this device reversing the regulator systems still need improvement to improve , there is a regulation and control accuracy , the control flexibility, reliability problems , urgent need to further change the system control method , the flexible control and improve the welding quality . Therefore, to make rail pressure welding electro-hydraulic servo system and control technology research, has important significance and value of the works . In this paper, YJ-720TB-ZS , based on the use of advanced servo control technology, Mitsubishi PLC and the A / D, D / A , etc., designed to study a new type of pressure welding electro-hydraulic servo control system and control technology . By controlling the electro-hydraulic proportional valve , replace the original welding regulator valve cone commutation control devices, improve the welding pressure, displacement , velocity regulation accuracy of key parameters , control flexibility, and reliability of the system ; analysis and comparison of the domestic valve the inlet valve such as different grades of hydraulic valve in the control characteristics of the new system , and in the new control system , based on the study of heat or fire, do not put a slit efficient direct heating heat welded rail feasibility of the process . The results showed that: the proportional relief valve regulator , fast response , high precision control : the use of electro-hydraulic proportional control to precisely control the welding displacement ; through electro-hydraulic proportional control can easily achieve a variety of welding processes ; electro-hydraulic proportional control system is applied to the rail pressure welding , compared with the motor control system has high reliability, flexibility and good control ; welded rail through field trials, good welding quality , reaching TB/T1632-2005 \item technology has a good practical value and popularization.
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