Abstract
In the field of port handling for bulk-cargo with heavy load and high speed, the differential gear box is usually used for towing wire ropes, and then realizing the Horizontal transport and vertical unloading of goods. However, the design and manufacture of gear device which is difficult to maintenance is of high cost. Thus, there is a kind of electric differential system to realize the loading and unloading of cargo at present. This article focus on the transmission mode and the process of loading-unloading of electric differential device. With the kinematic model based on the Lagrange's equation, the electrical differential system state model is established. Several AMESim simulations of the system is used to analyzing the energy transfer of combined action under the condition of electric differential. It helps to learn which path are used and the proportion on each line of energy. Finally, in this article, the difference of the energy transfer characteristics between the traditional mechanical transmission and the electrical differential drive system are analyzed. It provides guidance for design and use of equipment transmission system.
Highlights
The port has always been a transit point for international trade
The paper describes in detail the functions and performance of electric gearboxes and differential gearboxes, as well as the characteristics of the internal components of the differential gearbox, such as the return flow of the transmission and the loss of planetary gears
When the power is unloaded to a certain extent, the total installed power of the differential gearbox is larger than that of the electric gearbox, but the total consumption of the differential gearbox is lower
Summary
The port has always been a transit point for international trade. The development of the port has shortened the transportation time and distance between international trade[1].Delivering goods and products at lower costs and in shorter times is an important issue nowadays. The high level of complexity is because the two gearboxes share the axis of one motor and contain many differentials and many epicyclical gears This solution is frequently use for gantry crane. The second is a electro-technical solution which uses four electrics motor with four gearbox Most papers in this category didn’t do a direct comparison between two solutions.it remains that the differential gearbox is the most used technology on grab ship unloader but the electrical differential take quickly the market by becoming a better and cheaper solution. In view of advantages of electrical driving technology applying in high power crane, ZHANG Huiyan[3] proposed a method of coordinated work for the four drums They focus on the basic structure of the electrical differential and the hardware configuration, and linking dynamical parameters in the input of the motor such as current and voltage with the output parameters such as torque and speed. The torque and speed brought from the traction motor can be considered same
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