Mobile hydraulics from Festo Didactic
Mobile hydraulics has a range of specific features compared to conventional industrial hydraulics. These are normally taught directly on a vehicle. But what if the components or the vehicle are not accessible or the entire system is too complex for teaching purposes?
In contrast to a vehicle, with a learning system each hydraulic subsystem can be separately and individually constructed and examined. And measured values can be recorded almost everywhere for improved understanding.
While in a vehicle there is usually little room and access is restricted to qualified personnel, the elements of a learning system are manageable, easy to identify and fault-tolerant.
Work on a vehicle usually means dealing with dirt and unpleasant weather. A learning system is clean and ergonomic.
Working hydraulics – Basic level
At the basic level, flow control with directional valves with different mid positions are compared in terms of their energy usage. This is done using a cylinder load simulator which, depending on the design, is capable of simulating a wide variety of different load situations.
In addition, the topics of holding and lowering the load and two 6/3 way valves for actuation of two drives are discussed using the series, parallel and tandem circuits.
As a transition to the Working hydraulics - Advanced level, a simple load sensing controller with constant pump is implemented.
Working hydraulics – Advanced level
Here, the focus is on load sensing systems with variable displacement pump. This includes the construction, operation and adjustment of a variable displacement pump with a load sensing controller and mobile or control block. The energy usage with flow control, open centre load sensing and closed centre load sensing with a variable displacement pump can then be compared.
Remote control and hydraulic pilot control of mobile blocks can also be discussed and developed. In addition, the effects of upstream and downstream pressure balances can be tested.
Hydrostatic steering system
The working hydraulics can also be extended with a steering system. This teaches the construction and functioning of a hydrostatic steering system, with typical shock and suction valves and double-rod cylinders.
The influence and effect of loads on the steering cylinder are investigated. Combinations of working hydraulics and a steering system based on different priorities can also easily be set up. This illustrates the effect of steering activity on the downstream working hydraulics.
With the mobile hydraulics equipment set, Festo Didactic closes the gap between the basic principles of hydraulics and hydraulic systems on a vehicle.
For an ideal introduction to mobile hydraulics, a hydraulic power unit is available, with variable displacement pump and load sensing controller and a constant displacement pump. This enables both basic and advanced levels to be taught and load simulations to be carried out with just one power unit.