Sany Heavy Industry Co., Ltd. According to Shunqi.com's inquiry, the largest factory in Changping, Beijing is Sany Heavy Industry Co., Ltd., and Sany Heavy Industry Beijing Pile Machinery Factory is located in Nankou Town, Changping. The transparent glass curtain wall makes the workshop look like a modern office building. There are few workers in the 40,000-square-meter factory. Trucks automatically guide and transport workpieces from warehouses to production lines, and intelligent mechanical arms lift and assemble parts weighing several tons. The whole process is efficient, accurate and orderly.