1. The structure is welded by AIO automatic welding machine. Solder side is flat, weld-joint is solid and durable. They can service longer and without distortion.
2. Main-beam is processed by sand blasting to improve mechanical properties of surface, thereby gain a better wear resistance, extended its service life.
3. Hydraulic station is steady in operation and easy in maintenance. Piston is made by steel 45 after surface processing with feature of high hardness.
