FLOW MATERIAL OPERATING USING DEVELOPED 3DIMENSIONAL DETECTOR IN STORAGE SYSTEMS

Při řešení otázky zajištění kontinuálního toku materiálu v logistických systémech se často zabýváme otázkou snímání kapacitního průtoku materiálu za účelem sofistikovanějšího řízení celého logistického řetězce a reagování na okamžitou změnu potřeby výskytu materiálu. Příspěvek popisuje vývoj a testování 3Dimenzionálního snímače schopného identifikovat velikost materiálového průtoku a to nezávisle ve 3 dimenzionálních směrech. Vyvinutý snímač je konstrukčně ochráněn průmyslovým vzorem a taktéž jsou chráněny různé tvary snímače pro bezproblémovou aplikaci do skladovacích systémů.The issue on quantity of a material flow for assuring of continual material flow rate to sophistical material management of a logistic chain in general and response on material occurrence need change has been often investigated in the logistic system proposal. The paper deals with development and testing of developed 3Dimensional detector capable of identification of material flowage size especially to three-dimensional directions. Moreover, the detector is patented for industrial design and shape detector applications have been patented also for trouble-free applications to storage systems

Research and development of laser engraving and material cutting machine from 3D printer

This article deals with the adjustment of a 3D printer for laser engraving and material cutting. The print head can be fitted with a solid laser diode module, which achieves a compact size while retaining its useful power. Two paths lead to the use of such a concept. It is possible to equip the existing print head with a module, which also brings a number of disadvantages such as, for example, the reduction of the printing space or the need for a suitable mounting design. A more elegant solution is to consider this in the design of a 3D printer and design a system to exchange the print heads for 3D printing and laser engraving. Such a solution allows full utilization of the workspace and simple installation of the effector for the required type of work. According to the installed power of the laser diode, it is possible not only to engrave but also cut material such as thin wood, veneer or acrylic glass. The use of such a machine is not only for graphic elements but for the creation of various stencils, boxes or simple models, which can be made up of plastic-burning pieces. The laser module is controlled by a driver, which is designed for the device. This is connected to a 3D printer control board. It is, therefore, necessary for the control board to have at least two pins, which can be controlled after adjusting the control firmware. Most laser modules are normally equipped with an adjustable lens, which is used to concentrate the focus of a laser for the given distance against the worktop. Thus, the modified 3D printer can perform its function as a multi-purpose CNC machine, while a basic platform similar for both devices is used.Web of Science281524

Hydrometallurgical recycling process for mobile phone printed circuit boards using ozone

Printed circuit boards (PCBs) can be an important source of non-ferrous metals (Al, Sn, Zn, and Ni) and precious metals (Au, Ag, Cu, and Pd). With the continuous increase in demand for metals due to the depletion of ores, recycling of this waste is becoming an attractive alternative. The printed circuits also contain hazardous metals, such as Pb, Hg, As, and Cd. Due to the huge increase in the amount of e-waste, the processing of printed circuit boards for metal recovery and proper handling of hazardous substances has a positive effect on the environment. Pyrometallurgical and hydrometallurgical methods are used for the treatment of this waste. Various oxidizing agents are used in the hydrometallurgical processes, including ozone. PCBs from mobile phones were assessed for the recovery of Cu, Sn, and precious metals. The ground and sieved materials were leached in nitric acid, hydrochloric acid, and sulfuric acid at various process parameters, such as leaching time, leaching agent, and temperature. It was found that the best result was obtained using hydrochloric acid with the addition of ozone at 353 K for a period of 4 h to obtain 68.45 g/dm(3) of copper. Preliminary results of electrolysis and cementation are also presented.Web of Science115art. no. 82

Study of mass motion on vibrating device: Design and process simulation.

The simulation of mass motion using a vibrating device that was laboratory designed was the main idea of the work. The construction of an experimental vibrating device and the associated measuring station along with the measurement of dynamic properties of the vibrating device depending on preselected input parameters of the device of bulk material on this experimental model is presented. The simulation of the general behavior of particles on an experimental vibrating device at rotational frequencies of 20 Hz, 25 Hz and 35 Hz, and the rotation of contact vibrators at 30°, 45° and 75° by mass flow modeling using software ROCKY DEM is done. It was observed that the particles were moving at the fastest speed at 45° and at 35 Hz and that the top layers fall to the bottom especially at higher rotational frequencies, which may ultimately cause aeration of the particulate matter, thus reducing the angle of internal friction of the bulk material.Web of Science20236380637

Phase transformation after heat treatment of Cr-Ni stainless steel powder for 3D printing

Today, Ni-Cr steel is used for advanced applications in the high-temperature and electrical industries, medical equipment, food industry, agriculture and is applied in food and beverage packaging and kitchenware, automotive or mesh. A study of input steel powder from various stages of the recycling process intended for 3D printing was conducted. In addition to the precise evaluation of the morphology, particle size and composition of the powders used for laser 3D printing, special testing and evaluation of the heat-treated powders were carried out. Heat treatment up to 950 degrees C in an air atmosphere revealed the properties of powders that can appear during laser sintering. The powders in the oxidizing atmosphere change the phase composition and the original FeNiCr stainless steel changes to a two-phase system of Fe3Ni and Cr2O3, as evaluated by X-ray diffraction analysis. Observation of the morphology showed the separation of the oxidic phase in the sense of a brittle shell. The inner part of the powder particle is a porous compact core. The particle size is generally reduced due to the peeling of the oxide shell. This effect can be critical to 3D printing processing, causing defects on the printed parts, as well as reducing the usability of the precursor powder and can also change the properties of the printed part.Web of Science1515art. no. 534

Topology optimization of the clutch lever manufactured by additive manufacturing

This article aims to review a redesign approach of a student racing car’s clutch lever component, which was topologically optimized and manufactured by Additive Manufacturing (AM). Finite Element Method (FEM) analysis was conducted before and after a Topology Optimization (TO) process in order to achieve equivalent stiffness and the desired safety factor for the optimized part. The redesigned clutch lever was manufactured by using AM–Selective Laser Melting (SLM) and printed from powdered aluminum alloy AlSi10Mg. The final evaluation of the study deals with the experimental test and comparison of the redesigned clutch lever with the existing part which was used in the previous racing car. Using TO as a main redesign tool and AM brought significant changes to the optimized part, especially the following: reduced mass of the component (10%), increased stiffness, kept safety factor above the 3.0 value and ensured the more aesthetic design and a good surface quality. Moreover, using TO and AM gave the opportunity to consolidate multi-part assembly into a single component manufactured by one manufacturing process that reduced the production time. The experimental results justified the simulation results and proved that even though the applied load was almost 1.5× higher than the assumed one, the maximum von Mises stress on the component was still below the yield limit of 220 MPa.Web of Science169art. no. 351

Interpartikulární síly práškových částic a jejich povrchová modifikace

Coating is a process, by which fine particles in nano-range are connected to a powder particle material. During the initial phases of coating, surface of powder particle material is sprinkled by nano-particles and thus a lot of powder material properties can be directed and changed especially. A lot of method of surface coatings processing are discovered via commercial devices, and also there are a lot of pioneer devices working without basic knowledge of coating mechanism in laboratory background. The main advantage of the coated material is the possibility to changing the basic properties e.g. wetability, conductivity, electric and electronic properties, rheological properties, flowability, magnetic properties etc. It has been observed that only a few percentages (%W) are enough to ensure a property change and a property direction. In the paper, the coating mechanism and forces involved in coating processing are investigated and mathematical modeling of dry coating is initiated.Povrchová modifikace je proces, při kterém jemné částice v nano měřítku jsou spojovány k částicím práškového materiálu. V průběhu celého procesu povrchové modifikace je povrch práškového materiálu pokryt nano částicemi a to je příčinou, že mohou být řízeny a především změněny vlastnosti práškového materiálu. Celá řada metod nanášení povrchovou modifikací je již ve světě používána a realizuje se na komerčně vyráběných přístrojích. Také existuje celá řada amatérských zařízení pracujících bez větších znalostí povrchové modifikace v laboratorních podmínkách. Hlavní výhoda povrchově modifikovaného materiálu je možnost změnit základní vlastnosti materiálu-voděodolnost, vodivost, elektrické a elektronické vlastnosti, reologické vlastnosti, tekutost, magnetické vlastnosti apod. Pouze několik procent hmotnosti jemného materiálu v nano měřítku stačí, aby mohly být vlastnosti práškového materiálu změněny a řízeny. V příspěvku je prozkoumán mechanismus modifikace včetně působících sil při modifikačním procesu. Celý proces je popsán v rámci matematického modelování a následně objasněn a vysvětlen na několika partikulárních systémech

3 dimenzionální snímač napětí sypkých hmot v zásobníku

The paper deals with a bulk solid pressure observation inside a silo using new developed 3Dimensional (Triaxial) Detector. New design and conception of the 3D indicator have been developed exclusively for detecting of real stresses/pressures inside vessels, bunkers and silos. The unique design of the 3D detector in cooperation with appropriate used software, and with a silo model is able to assure a clear image to pressure/stress identifications in particulate solid. Moreover, the third dimension is unique and enriches the area of the pressure knowledge. The measurement process incl. the procedure of processing values using the created interactive software environment has been explained in the paper intimately and investigated in a real silo loaded by a poured bulk solid. Real results and outputs of the investigation have been presented and discovered in the paper.Příspěvek se zabývá sledováním napětí sypké hmoty uvnitř zásobníku pomocí nově vyvinutého 3Dimenzionálního snímače. Nová konstrukce a koncepce snímače byla vyvinuta specálně za účelem detekování reálných napětí (tlaků) v zásobnících, silech a skladovacích nádobách. Unikátní konstrukce tohoto 3D snímače ve spolupráci s vhodným SW a modelem sila dokáže zjistit skutečné napětí (tlaky) sypké hmoty. Navíc, třetí rozměr je zcela ojedinělý a svým způsobem rozšiřuje znalosti a představy v oblasti tlaků v 3D prostoru. Měřící proces včetně metodiky vyhodnocování výsledků byl vyvinut v interaktivním SW prostředím. Skutečné výsledky a výstupy výzkumu hjsou prezentovány v tomto příspěvku

Zlepšování tekutosti sypkých hmot v dopravních a skladovacích systémech

Import 29/08/2007PrezenčníNeuveden

Výzkum nežádoucího drcení sypkých hmot, zejména uhlí, v průběhu dopravy

Import 21/04/2006Prezenční výpůjčkaVŠB - Technická univerzita Ostrava. Fakulta strojní. Institut (342) doprav