ANALYSIS OF TOOL GEOMETRY FOR SCREW EXTRUSION MACHINES
The contribution deals with the technology
of biomass briquetting into the solid high-grade biofuel by screw extrusion machines. It
is focused mainly on the theory of compacting
tools for screw briquetting presses, their analysis, stress conditions and geometry. The main aim
is analyzing of pressing screw geometry and dete
rmination process of its design. Analysis of
force conditions on the screw is necessary for d
esigned geometry verification and for stress
analysis. The determination process of the fricti
onal power is instrumental to main power drive
design. Knowledge of these processes is the base
of the new tools research for screw presses,
the increase of tools lifetime and the competitiveness of whole technology.
Key words.
biomass, briquetting, tool, screw, screw machine, screw profile
FINITE ELEMENTS METHOD APPLICATION AT THE ENGINEERING OF BRIQUETTING MACHINE FOR BIOMASS
Abstract: Finite element method is a progressive tool for developed engineering work. Softwares which used the finite element method for simulating physical phenomenon are more and more sophisticated. Engineers have to find a way how to use these software tools correctly. For these types software simulators exist verifications methods which compare Analytical solution with Computed results. These particular master tasks are useful for real usage and calibrate the software for application in real life. The biomass compacting is a very complicated process, because the biomass is a “live” material and there are many factors influencing this process. We used finite element method for our development work and optimizing the machines construction.
Key words: biomass, finite element method, pressing, compacting, briquetting, Catia V5R20, solver verification.
PLASTIC WASTE AS A SUITABLE RAW MATERIAL FOR THE DESIGN OF MODULAR FLOOD BARRIERS
The Slovak university of technology in Bratislava is currently involved in the project “Research of progressive technologies for the recovery of waste from scrap automobiles”, 1 , in harmony with the priorities of the Slovak ministry of environment (SME). The principal coordinator of the project is the faculty of mechanical engineering, and the project is financed by the Recycling fund in Slovakia. SME has stated in a press release that: “foremost, the effective protection against flooding, and the reduction of environmental burdens in sensitive and national park zones remain our priority”. (SME, Ing. Peter Žiga, PhD., press release ME SR, 1.7.2012.)."
Key words: recycled plastic, ant flooding, flood barriers.
DEVELOPMENT OF MODULAR FLOOD BARRIER CONCEPT MADE FROM RECYCLED PLASTIC
This contribution describes developments in the area of plastic recycling aimed at the reuse of waste materials for the manufacture of a useful product. Throughout development of the concept “modular flood barrier structure”, the recovery of plastic materials was assessed, primarily, plastic waste from automobiles and industry. For the modular design of the structure a utility model was prepared.2 In terms of the type and composition of source material, polypropylene (PP) and polyethylene (PE) were the materials chosen. When designing the geometry and constructing the barrier, the first stage was to design the structure based on the shape of unified blocks made from PP and PE. These unified blocks were designed in Slovakia at Chemosvit Environchem, a.s. but are also available internationally. In cooperation with Chemosvit, the focus was to produce blocks made from recycled materials and their subsequent application for beneficial use. The present need for flood protection inspired its production from these recycled materials. The suitable shape and strength characteristics of the plastic blocks provided sufficient grounds for the development of the flood barrier. In the first phase, different structural shapes were assessed in terms of their stability to determine their suitability for the given application. The results of these efforts were the initial design of the whole structure and its parts. Following this, the structure was revised and a prototype was constructed. The structure underwent numerous optimization processes including finite element analysis (FEA) and internal/external stability analysis. Production documentation, prototypes, and field tests were also performed. Currently, changes to the design are being performed in order to prepare it for mass production.
Key words: recycled plastic, ant flooding, Watergates.
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Design Process of Energy Effective Shredding Machines for Biomass Treatment
The shredding process has not been sufficiently investigated for the design of better, energy and material saving shredding machines. In connection with present-day concern about the environment, ecology, energy saving, recycling, and finding new sources of energy, we need to look at the design of shredding machinery, the efficiency of the machines that we using, and ways of improving them to save electric energy for their operation. This paper deals with sizing and designing shredding machines from the point of view of energy consumption and optimization for specific types of processed material.
Keywords: shredding; disintegration; shredding machines
Idealized Compression Ratio for a Screw Briquetting Press
This paper deals with issues in determining the ideal compression ratio for a screw briquetting press. First, the principles of operation and a basic description of the main parts of a screw briquetting press are introduced. The next section describes the pressing space by means of 3D software. The pressing space was created using a Boolean subtract function. The final section of the paper measures the partial volumes of the pressing chamber in CATIA V5 by function of measuring. The measured values are substituted into the formula for the compression ratio, and the resulting evaluations are presented in the diagram in the conclusion of this paper.
Keywords: screw briquetting press; compression ratio; calculation of compression ratio
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VÝVOJ TECHNOLÓGIE A KONŠTRUKCIE NÍZKOENERGETICKÉHO ZHUTŇOVACIEHO STROJA
autor: Ing. Juraj Ondruška PhD.