Somebody told me that there is a huge telescoping hydraulic cylinder, yet where would all the hydraulic fluid be kept?Another person told me that there is a hydraulic motor that drives an internal chain, yet I can't visualize thisAny explanations would be appreciated, or perhaps pointing me to a diagramThanks
If you are really squirting your baby with a water bottle (and not a troll) then i'd say youre a piece of and if i caught you doing that i'd beat the out of youEdit: WOW, you are truly classless and ignorantWHO DOES THAT? Are you dumb, ignorant and on welfare? That is LITERALLY how truly stupid you sound right now.
Let him make a mess he's a baby dont squirt him with water that is not right treat him better dont take it for granted
Actually the howstuffworks link did answer your question alreadyHuge telescoping cylinders is not the word, it's more like long (since the boom extends a long distance)But since the main arm is longer than the boom, all the driving rods are contained within itThe boom is driven by a high gear pump which is in turn driven by the diesel engineThe pump raises the fluid pressure to a high valueThen, pressurized lines extend to different parts of the crane (the same pump operates the boom and the lift) and pressurize the bottom end of a pistonThe piston has a long rod which pushes the boom outNo chains Now let's do some very basic math: the site says the main pump works at 3,500 psiLet's say for the sake of example that the weight of the boom is 20,000 lbs (I made that up but it should be close for a mid size truck crane)Then the minimum theoretical piston area to lift that boom would be (20,000/3,500) a measly 6 square inchesOf course the actual piston would be much bigger than that (friction, safety factors, losses, etc.) but it gives you the idea: a smal contact area goes a long way in hydraulicsOf course the actual lifting capacity would be much higher than the boom weight but that doesn;t count since the boom is locked in position after it is extended, so the piston does not have to hold the weights.
