With the advent of the era of e-commerce, the logistics industry has developed to the peak of logistics enterprises to take a number of factories and enterprises in equipment, cargo transport work, usually within the first cargo warehouse was finishing molding, and then for different regions, respectively delivery, then transfer the work stored in the warehouse of a large packaging by overhead cranes which is mainly used in the warehouse.
 
Overhead crane always used in the warehouse for transport and deliver because it had lots advantages like: low self-weight; simple structure; easy to assemble and disassemble. Its capacity ability ranges between 5-50 tons, good enough for the warehouse transportation. Therefore overhead cranes are the logistics company’s best choice.
 
In the course of their work, bridge crane control system plays a vital role in such traditional crane electronic control system uses a resistor in series with the rotor circuit has a level control, overhead crane drawbacks of this system is easy to make mechanical impact force is too large, resulting in severe airframe vibration, does not work, and therefore, updated technology control aspects from the system first.
 
Zhengzhou Huazhong Construction Machinery company products overhead crane operation using digital control system, due to the large overhead crane parts are needed to run independently, in order to avoid the series in the job process, a part of the case to stop affect the other components, the use of PLC speed signal to achieve the overhead crane control, the entire control system includes a programmable controller, inverter, brake resistor three aspects, these three areas are controlled by the PLC.
 
Control system is the soul of the whole bridge crane, in the large-scale logistics enterprises, rely on manual methods to complete the distribution of the goods is unrealistic, with overhead cranes to ensure timely distribution of goods and save a lot of manpower resources.