Did you know that just about every aerial lift is actually a hydraulic lift? It’s true. Even lifts that raise their baskets and platforms by chains and cables usually have a hydraulic system doing the lion’s share of the work.
Simply put, a hydraulic ram, or cylinder, provides the power and movement to raise the lift platform. That hydraulic cylinder lifts the platform by means of a hydraulic pump that takes hydraulic fluid from a reservoir, and pumps it into a hydraulic cylinder at very high pressure. That hydraulic fluid in the cylinder pushes out a piston that causes the lifting. By opening a valve along the pressurized hydraulic pathway, fluid is allowed to drain from the cylinder, and thus the basket begins to lower. Other functions of a lift operate on the same principle.
Most lifts today operate by an indirect or “relay” method. That is to say, the operator works an electronic control that in turn operates a hydraulic valve. On some of the older or more basic lifts, the operator moves a lever that actually opens or closes a hydraulic valve assigned to a particular function or movement.
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From: Bill Skoda [mailto:b.skoda@randallind.com]
AERIAL LIFTS AND THE HYDRAULIC CONNECTION
Did you that just about every aerial lift is actually a hydraulic lift? It’s true. Even lifts that raise their baskets and platforms by chains and cables usually have a hydraulic system doing the lion’s share of the work.
Simply put, a hydraulic ram, or cylinder, provides the power and movement to raise the lift platform. That hydraulic cylinder lifts the platform by means of a hydraulic pump that takes hydraulic fluid from a reservoir, and pumps it into a hydraulic cylinder at very high pressure. That hydraulic fluid in the cylinder pushes out a piston that causes the lifting. By opening a valve along the pressurized hydraulic pathway, fluid is allowed to drain from the cylinder, and thus the basket begins to lower. Other functions of a lift operate on the same principle.
Most lifts today operate by an indirect or “relay” method. That is to say, the operator works an electronic control that in turn operates a hydraulic valve. On some of the older or more basic lifts, the operator moves a lever that actually opens or closes a hydraulic valve assigned to a particular function or movement.
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Great !!! i always wonder what is the mechanism of the scissor lifts and boom lifts is . I don’t realize they are just a hydraulic lift. Thanks for sharing