|
|
Drive and Control Systems for Commercial Vehicle Superstructures
Drive Hydraulics for Loading Cranes, Cargo Cranes and Timber Loading Cranes
|
|
|
|
|
|
Sophisticated variable displacement pumps based on the axial piston principle are used for the drive hydraulics of truck loading cranes, piece cargo cranes and timber loading cranes. Wherever dynamic performance, economic operation and fast working speeds are the main priorities, variable displacement pumps, with different control systems depending on the specific requirements, provide the ideal solution. Rexroth systems are optimally tuned to the particular application and are customised to meet individual user requirements. They are characterised by high reliability, safety and ease of use, even under difficult operating conditions.
Assembly and Loading Cranes in the Power Class up to 10 mt with LUDV Control
In this application range, the main requirements are good mobility and high load capacity of the crane. Rexroth systems are ideal for rapid and powerful material handling. SX control blocks are based on the LUDV system, which distributes the oil flow independently of the actual load. LUDV control systems enable a number of operating movements to be performed simultaneously and independently of one another. In addition, the SX control block provides two speed stages, for sensitive and aggressive operation of the loads. An emergency stop switch and pressure transfer line are already built into the inlet unit. The SX control block replaces the old dual-circuit systems.
Assembly and Loading Cranes in the Power Class over 10 mt with Load-sensing Control
In these systems, there is constant interaction between the pump and control block in order to supply each individual crane cylinder with only the quantity of oil actually required for the current operating function. Several functions can be operated at the same time, because the variable displacement pump always delivers exactly the quantity of oil that the combined loads require. When none of the loads are in operation, the pump automatically switches to “standby” mode. In this mode it delivers about 3 litres/min against a set pressure of 25-30 bar, corresponding to a power input of less than 1 kilowatt.
Load-sensing Control Block
The Rexroth M4 load-sensing control block provides a reliable basis for high-pressure applications with maximum pressures of 350/420 bar. The M4 is able to control all the functions of an assembly crane. The central inlet unit can distribute high volumetric flows to up to ten valve functions.
Rexroth M4-12 (LS system)
- Inlet unit with reversible shaft for emergency stop, static support and crane operating functions.
- Primary pressure safety system
- Integral pilot oil supply
- Cut-off for pilot oil supply (secondary cut-off system)
- Simple conversion from open-center to closed-center variants
- Electro-hydraulic actuation with manual override lever
- Built-in CAN electronic system with positional sensor for safety cut-off
- Stroke limit for maximum flow setting
- LS pressure limiting valves for supply pressure control
- Secondary pressure feed valves for securing dynamic loads
To view the first image (JPEG, 278KB), click here
To view the second image (JPEG, 287KB), click here
Relevant links for Commercial Vehicle Superstructures
Back to Drive and Control Systems for Commercial Vehicle Superstructures Home Page
|
|
|
|
