VEGETATION CUTTING MODULE - DESIGN Slide 2 Deminers want to be
helped in vegetation cutting, specially palm leafs Slide 3 Tools
used now: saw sickle shears Slide 4 Working position Slide 5 Light
vegetation, where grass is prevalent: Medium vegetation, where bush
is prevalent: Heavy vegetation, where bush is prevalent: Vegetation
types Slide 6 Constraints tripwires bushes Slide 7 Other
constraints Low power consumption Low-cost Easy to use and maintain
Robust Made of few, simple parts easy to find on the local market
Able to work in dusty, dirt environment, at high temperatures Light
Slide 8 Cutting system: cutter bars Advantages: able to cut small
bushes low cost low power absorbed modular Drawbacks: heavy Slide 9
Module structure 3 cutter bars: 2 vertical 1050mm 1 horizontal
650mm Slide 10 Actuation system Hydraulic/pneumatic typeHigh forces
Compact space Flexible placement of components Cheap Robust Layout
of cylinders All cylinders are double acting and equal Power
generated by a cylinder actuated by p.t.o./air compressor Modular:
if 2 cylinders are disconnected, the volume of two facing chambers
is equal Pmax= 232bar Oil= Agip OSO 15 typeCylinders= double
acting, 15mm bore diam. 80mm stroke, not cushioned Slide 11 Frame
design Steel, C section, connections welded Loads applied: 2000N
force at the extremity of the bar, only one vertical bar engaged at
time SigmaMax = 100MPa FEM analyses: Vertical bars: VA=13000N
VB=11000N Horizontal bars: VS=7900N VD=5900N Slide 12 Connections
and assembly tool Connection to attach cylinders to the cutter bar
Screws for fixtures Pins for cylinders Single tool: wrench 17mm
size Set screw key 6mm size Small hammer
