The main elements of the electrical system and the hydraulic system adopt the world famous brand products, guaranteeing the reliability of the products. The slewing mechanism adopts three working modes: normally close brake, slow-motion (when distributing) and quick-motion (when transferring), which can prevent accidents due to the wrong operations by mistake when working.. The arm support adopts limit element analysis calculation, dynamic analysis calculation, wall-impingement tests and industrial reliability tests, together with tests and control of many technological processes so that the arm support system has steady operation, long service life and safety and reliability. It adopts world cutting edge remote control and electrolyte proportional control so as to have comprehensive function and flexible operation.