Ultralightweight High capacity Drum

grabcad

This is a Carbon Fiber Ultra Light Weight Rassor collection Drum. Two drums are used per side with them positioned 180 degrees out of phase or in a counter rotating arrangement.This design is well suited to pickup and discharge in any gravity environment as those actions are gravity indepenendent.The safety Factor for the Design with a 200lb load on the digging teeth is 3.64.Maximum Displacement is .15mm which translates to a very strong and very stiff design that can handle tooth loadings in excess of 600lbsDetails:OD: 450mmOverall Width: 359mmCutting Width: 175 mmCutting Edges: 2Cut depth: aprox. 20mmMass: 2 drums, 1.928kg (964g/drum)Capacity: (note includes 30mm allowance for central drive shaft) See Images for Min Max Volume configurationInternal Volume(maximum, 2 Drums, 180 degree phased at Top and bottom): 35.6liters(15.4L and 20.2L)Max individual Cartridge Fill Ratio: 99%, 20.94L (scoop at horizontal upside)Expected Maximum Fill Ratio: 96.4%, 20.2L at upright positionMinimum Individual Cartridge Fill Ratio: 74%, 15.4L(scoop at bottom)Combined overall Fill ratio: 85% (combined 2 scoops at 180degree offsets(96.4%, 74%)Materials:Side Plates: GFRPDrum Shell: GFRPScoop Head: GFRPTeeth: Titanium, Riveted Rivets: AluminumConstruction:Sides and Shell: BondedScoop and Shell: BondedScoop and Teeth: RivetedDesign Features:Cartridge design: a) allows for quick swap out in the event of damage or obstruction.b) Reduces chance of total loss of function of a unified drum assembly due to damage or obstructionc) simplifies construction while maximizing material propertiesGFRP Construction:Removes need for internal structures to maximize storage and minimize potential build up and blockagesOffset design:self regulating depth of cutSingle cutting edges:Increase available shearing forceRadiused cutting edge:Reduce Digging in, uses a shearing action to remove material rather than an breaking digging action reducing chance of grabbing.Regolith is removed in thin layers(See Attached DPM analysis)Manufacture:Minimum component count(6)Manufacture methods are common and well knownSimple and quick assembly of componentsAdditional Notes;Oversize scoop and tunnel vs cutting depth reduce chance of Blockage or jamming approximately 3 times larger than designed depth of cut, which is similar you what the current Rassor System has found most successful.Additionally reduced number of rotations for Discharge.