The Rongkai mechanical crank arm elevator is a new replacement product of the folding arm type. Able to overhang, cross certain obstacles or lift at one place for multi-point operation; 360 degree rotation, large platform load, can be used by two or more people at the same time and can be equipped with certain equipment; the lifting platform has good mobility, convenient transfer site; beautiful appearance, suitable for a wide range of operations such as stations, wharves, shopping malls, stadiums, residential properties, factories and mining workshops. Self-propelled crank-arm elevators are aerial work equipment that can perform aerial work over obstacles. Crank arm lift: no external power supply, suitable for high-altitude erection work in the field, use diesel engine or battery as power drive for walking and lifting. Self-supporting legs, self-lifting, self-walking performance, and when working at high altitude, it can cross an obstacle and rotate 360 degrees; the control system is two-way operation up and down. This greatly facilitates the maintenance staff and saves working time. At the same time, this product is also equipped with a hydraulic lock protection device (even if the machine fails or the diesel engine is out of oil, it will not suddenly drop, bringing safety hazards). The self-propelled crank-arm elevator is widely used in urban construction, oilfield, transportation, municipal administration, outdoor advertising and other industries due to its advantages of flexible and rapid movement, simple operation and wide range of operations. Easy to identify operation panel, multiple mechanical, electrical and hydraulic safety protection, integrated hydraulic and electrical integrated system. Crank arm elevators are: diesel self-propelled, trailer, hand-drawn, battery-mounted, car-mounted. The crank-arm aerial platform truck is widely used in the installation, maintenance and ascending operations of municipal administration, electricity, street lighting, advertising, communication, photography, garden, transportation, wharves, airports and ports, large industrial and mining enterprises and other industries. It is suitable for all kinds of rugged terrain in the field, and has a wide range of space operations. It is mainly used in construction, bridge construction, shipbuilding, airports, mines, ports and terminals, communication and power facilities construction and outdoor advertising construction machinery and equipment,