Presentation on theme: "Machines and Devices of Logistics - Thematics"— Presentation transcript:
1 Machines and Devices of Logistics - Thematics Forklifts II.Automated guided vehicleswith presentation in the laborOverhead cranesOverhead conveyors and monorail systemsTest 2Capacity analysis of complex materials handling systemsModeling possibilities of manufacturing logistic processesGraphsPetri-netsSysML Modeling languageSimulation software (ált)Test 3Building and analyzing material flow in logistic systems (capacity, stocks, bottlenecks etc. using Simul8)Classification of the transported goods and main classes of materials handling machinesMachines for handling bulk materialsBelt conveyorsBucket elevatorsScrew conveyorsRoller conveyorsPresentation of the conveyors at the departmentPractice for the test 1Test 1Machines for handling unit loadsContainers for material handlingTypes of unit loads inside manufacturing systemsForklifts I.
2 Requirements on timing and relations Definition of materials handlingOrganized motion of goods and materials which covers shorter distances and the state of the transported object doesn’t change.In a typical factory, MH accounts for 24% of all employees, 55% of the space, and 87% of the production time.It accounts for between 15% to 70% of the cost of a product.Relation of materials handling and logisticsRequirements on timing and relationsMaterials handlingLogisticsProvision of materials’ transport services
6 Materials handling related features of solid bulk materials typically homogeneous materialstransport and loading in greater masses, without packagingMaterials handling related features of solid bulk materials:grain size (average, max, min)grain-size distributionbulk-densityfriction coefficient on solid surfacesmoisture contentcohesionfriability (fragile)flowabilityabrasivenesscorrosivenesstemperaturefrozenhealth-threatening
7 Materials handling related features of solid bulk materials Examples :Ashes: abrasive when dry, corrosive when wetCharcoal: dusty (explosive dusts)Cement: entrains air, compacts in storage, must not contact with moistureGrass seed: gentle handlingSulphur: danger from static sparks, risk of ignition, corrosive when wetIron ore: may be in large fragmentsWheat: hygienic conditions
8 Materials handling related features of solid bulk materials Grain-size distribution diagram
9 Materials handling machines for handling solid bulk materials Choice of equipment1. Type of conveyor or elevator2. Material transfer3. Profile4. Material propertiesEffect of the height difference for the choice of the equipment
10 Materials handling machines for handling solid bulk materials
15 Belt conveyors Calculating capacity for a belt conveyor Capacity reduction coeff.Inclination coeff.Loading coeff.
16 Belt conveyors Driving of a belt conveyor Max. circumferential force at the drumRequired tensioning forceMax. belt forcePossibilities of increasing arc of contact
17 Belt conveyors Comparison of tensioning force Head side driven Tail side driven
18 Belt conveyors Dual-drum driving system Dual-drum driving system Ratio of the required torques at thetwo drums:
19 Belt conveyors Calculation of the required force Length-dependant resistanceLength depending drum resistance factorDeflector plank resistanceBelt cleaner resistance2-5 N/cmMaterial acceleration (feeding) resistanceResistance of a discharge trolleyLifting resistanceResistance of forward tilted idlersNumber of forward tilted idlers
20 Belt conveyors Belt feeding Speed vector of the material loaded onto the conveyor conveyor speedfeeding beltTips for feeding: