At the University of Missouri, Columbia, a 300-ton hydraulic press has been designed for the fast compaction of coal logs, which will be transported through water-filled pipelines. Because the pressure of the water inside the pipe can be as high as 1500 psi and the pipeline can be as long as 1000 miles, the quality of coal logs made for such a transportation system is very important. The required compaction pressure can be as high as 20000 psi. In addition to size and force requirements, the operation speed of the compaction machine is important. To reduce manufacturing time, time-consuming operations are divided into several stages. The first stage is to precompact the loaded coal materials into the mold at low pressure, the second is to compact the logs at high pressure, and the third is to eject them. Two distinctly different designs have been taken into consideration: A two-plate frame with three 8-inch thick platforms sandwiched in between, and a four-column structure with three platforms fastened on the columns, which was chosen for the final design. The hydraulic power system consists of one 200-hp electric motor, four hydraulic pumps, two 12-inch-bore hydraulic cylinders, control valves, and other accessories. Commercially available, PC-based software were used to create the press. Integrated FEA and optimization software generates design alternatives and determines the best one based on a user-specified objective function and constraints. Results to date show that the procedure is an efficient, flexible, low-cost, and powerful design tool. The press can also be used to manufacture other products from wet granular mixtures.
Compacting coal into logs
Mechanical Engineering ; 119 , 11 ; 84-86
1997
3 Seiten, 1 Bild
Article (Journal)
English
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