I produced the two-stage extension boom excavator is mainly applied to the pier construction, earth sediment, concrete and other construction transport, highways and river dredge dredging slope repair works and building foundation, rivers, deep groove and other earth excavation work, By installing excavator long arm on the basis of the original excavator, to complete standard arm can not reach the distance, so excavator to maximize its use for a wide variety of special construction operations, so that efficiency and security more High Huitong mechanical excavator plus the long arm of the advantages of using advanced computer-aided design system, various types of processing and testing equipment, developed skills and practical application of knowledge and experience, in terms of stress analysis, material selection, process, design, and so guarantee the structural strength of the product, performance and quality. Material, Huitong steel used was changed from the traditional Q345 Q460, wear arm, compression is better, so that customers at the same price to buy better products. (Customers can also choose a higher intensity equal strength Q690D more high sheet) plus the long arm excavator internal structure: the inner arm is mounted inside the buffer plate-cum-X board to withstand tensile load, extending the life of excavators and products. Personalized design, construction according to the specific requirements of the guests, and in the scientific premise for the customer's products for local changes, to better the working efficiency. Service, product arrived at the scene the first time by professional engineers for product guidance installation instructions, allow customers to buy peace of mind with the assured.