China 
Africa 
Explore chapters and articles related to this topic
Material Handling Systems
Published in Susmita Bandyopadhyay, Production and Operations Analysis, 2019
Belt conveyor can also be roller belt conveyor (having rollers below the conveyor belt for the movement of the loads), slider belt conveyor (for carrying loads over both horizontal and vertical planes), telescoping belt conveyor. Chain conveyor is also a type of powered conveyor that uses single or double chain in order to pull and move especially pallet type of loads. This type of conveyor also carries loads over both horizontal and vertical planes. Live roller conveyor is also a type of powered conveyor in which “force sensitive transmission is used to disengage rollers.” Live roller conveyor can be belt driven live roller conveyor, or line shaft driven live roller conveyor. Platform conveyor is another type of powered conveyor with platforms and with chain that runs continuously in infinite loop. Besides, there are slat conveyor (made of nonoverlapping slats), vertical reciprocating conveyor, sortation conveyor, cart-on-track conveyor, tow conveyor, trolley conveyor, screw conveyor, pneumatic conveyor, vibrating conveyor, bucket conveyor.
Chain-Type Conveyors
Published in Muhammad E. Fayed, Thomas S. Skocir, Mechanical Conveyors, 2018
Muhammad E. Fayed, Thomas S. Skocir
Chain conveyors are used to convey large unit pieces or objects. Materials commonly conveyed with chain conveyors include logs, cut wood stock, plywood, sheet rock, large metal castings, long sections of pipe, crates, and boxes. Any large regular heavy object can be conveyed with some form of plain chain conveyor.
Variable takt time groups and workload equilibrium
Published in International Journal of Production Research, 2022
Tobias Mönch, Arnd Huchzermeier, Peter Bebersdorf
Before introducing variable takt times, managers must check to ensure that the following minimal technical assembly requirements have been met: the conveyor can cope with variable spacing of units along the line (e.g. with the aid of AGVs); all stations can cope with the lower takt times—as compared with the fixed takt time case—of smaller units; and the information technology system (e.g. enterprise resource planning or manufacturing execution systems) are capable of handling variable takt times. For example, plants with either an apron or a fixed chain conveyor may not be able to adjust their conveyor system in a timely and cost-efficient manner. The Fendt tractor assembly plant addresses this issue by using AGVs; it also has invested in its paint shop to lower processing times enabling the takt times of its smaller models and their configurations.
Stress analysis of longwall top-coal caving face adjacent to the gob
Published in International Journal of Mining, Reclamation and Environment, 2020
J. C. Wang, Z. H. Wang, S. L. Yang
Longwall top-coal caving (LTCC) method is widely used in the underground mining of thick coal seams. In the LTCC face, the thick coal seam is divided into a bottom and a top section (Figure 1). The bottom coal is sliced by a coal shearer and transported by a chain conveyor installed in front of the support. The top coal fails and caves on the back canopy of the support under the influence of the mining-induced stress. The caved top coal flows onto another chain conveyor installed behind the support through a drawing window on the rear canopy [1]. Obviously, it is favourable that top coal caves in small fragmentation manner while large blocks should be avoided.
Travel time analysis and dimension optimisation design of double-ended compact storage system
Published in International Journal of Production Research, 2023
Qing Yan, Jiansha Lu, Hongtao Tang, Yan Zhan, Xuemei Zhang, Yingde Li
To facilitate a more accurate description and more scientific research of the system travel time model, the following assumptions are made: The system is a double-row rack system and has a continuous rectangular-picking face. As a result, the S/R machine can reach any position in the aisle to complete either the left or the right operation symmetrically.The system adopts a random storage policy that any location on the rack-picking face has the same probability of being selected as a storage or retrieval space.There is one system I/O port located at each end of the rack. The starting point of the first task of the S/R machine is any end, and the I/O port performing the retrieval task is determined by the shortest travel time to complete the task.The S/R machine adopts the ‘Stay’ dwell-point policy that the S/R machine will stay in the position where it completes its last operation.The S/R machine and the circular chain conveyor adopt the task policy based on the ‘first come, first serve’ principle to meet the storage and retrieval needs of unit loads.The S/R machine and the circular chain conveyor can transport at most one piece of loads at a time, and the running speeds of the two equipment are constant and independent of each other. Our numerical analysis results have shown that the error caused by this assumption is acceptable.Ignore the start/brake time of the S/R machine and the circular chain conveyor, as well as the loading/unloading time of the unit load.The S/R machine and the circular chain conveyor are not interrupted at the beginning of the task until a task command is completed. When a task command is generated, the S/R machine and the circular chain conveyor start to work simultaneously, assuming that the circular chain conveyor cannot transport the unit load to the designated picking face in advance.