I was under the impression that someone got in on the ground and then made the arm go up while carrying things and at the end of the day, the person made the arm go down and went home.
But cranes are always up at night. So what do they do? How do they work?
In: Technology
I assume you’re talking about crawler cranes that you see in road construction or similar ventures.
https://images.app.goo.gl/RzrgsvuinXD1d8AH6
So.. this is a friction drive crane.
Almost all of its functions are driven by a clutch and brake system. The brake system has an air driven mechanical locking system. Kind of like the hand brake on a car. But it locks when the air pressure is released.
So the operator gets in. Starts the engine, Closes the air tank release valves, builds up pressure in the tanks and then is able to release all the mechanical brake locks.
He does his duties with the machine. Operating it in a safe and controlled manner and being mindful of all the redundancy features and settings.
Then at the end of the day. He positions his crane in a safe direction. Holding any valuable items up out of reach of thieves. Like generator trailers. Or mixing plants. Or light towers. Then he sets all his brake mechanisms and redundancies, Shuts the engine down and purges his air tanks.
ELI5.
Crane is very large and very strong. It can easily hold itself up when you tell it to stop and wait. And it won’t move again until you tell it to go.
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