Study On An Optimization Of Flow Of Nanjing Express And Logistics Hub Based On Petri Net

Post as a national public foundation, in the process of social development, plays an important role. With rapid growth in the21st century, the postal service, e-commerce and enterprise exchanges between deepened, letters (direct mail), express delivery, packages and other business development progresses by leaps and bounds, to improve the efficiency of mail processing, national postal service and put forward the construction of high standard China post group mail processing center. Nanjing China post aviation express delivery of logistics distribution center is to actively respond to China post group express logistics competition in the domestic and international market, to defend national express logistics industry, the development of aviation express logistics, against the international express delivery of logistics predators by use of strategic initiatives. At present, the collecting and distributing centre of nanjing has been largely automated internal process become the key link of the whole center processing capabilities, is directly related to production efficiency and the service time of the message. Nanjing hub due to built recently, however, each department is still in the period, in terms of specific mail processing also has some problems, such as process arrangement is unreasonable, the efficiency is low, improper staffing, equipment utilization rate is not high, restricts the distribution center processing efficiency, colleagues also increased the processing cost, reduce the investment benefit. Collecting and distributing, on the basis of the existing internal processing through the Petri net model, and use the Witness simulation software to run the simulation of the model, analyze the internal process of each working procedure, found in the conveyor belt transmission and automatic sorting machine opening mail sorting process exists the phenomenon of waiting in line, in the manual for a rate and dispatching process appear larger probability, pooling, opening, sealing and manual for the blocking phenomenon appears in process, etc., aiming at the problems in the above process, put forward the optimization solution:adjust the opening process until the collection process, other process; To achieve transmission line and the matching between process efficiency, increase a conveyor line, will bring together the conveyor process processing efficiency by a factor of1, at the same time, reducing human for a number of staffing a half; Will be treated as dispatching process of60people, increase in efficiency increased by40%, in order to solve queuing phenomenon, targeted to improve, to shorten the time of the distribution center mail processing, reduce processing costs, improve automation and standardization of postal operations, has the very vital significance.