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CZECH TECHNICAL UNIVERSITY IN PRAGUE | FACULTY OF MECHANICAL ENGINEERING
Department of Production Machines and Equipment | PMEResearch Center of Manufacturing Technology | RCMT
Energy saving hydraulic drives for industrial machines
Tomáš Krannich 4.12.2013
22nd International Conference on Hydraulics and Pneumatics
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Energy saving hydraulic drives of industrial machines
ŽĎAS LVH 2500
Technical parameters:Rated deformation force ( tons ) : 2500Number of strokes ( 1/min ) : 20Rated power stroke (kgm ): 35000Stroke ( mm ) : 500Slide area ( mm x mm ) : 1050x1200Gross Vehicle Weight (kg ) : 108400
The machine is equipped with a lower hydraulic drive. Spindle diameter = 500 mm , slide speed = 1 m / s
22nd International Conference on Hydraulics and Pneumatics
3Braking large inertia
Mechanical energy
Throttling of hydraulic flow
Heat loss
Electric energy
Energy saving hydraulic drives of industrial machines
22nd International Conference on Hydraulics and Pneumatics
Hydraulic accumulator
The braking resistor- It is used primarily as a protection element
Second Recovery in el. network- The need for phasing, especially for higher performance
Accumulation el. energy in batteries, capacitors- High price and low capacity (large number)
Power supply to other drive- Calculation of operating parameters
Hydraulic energy
4Energy recovery - Electric
Energy saving hydraulic drives of industrial machines
22nd International Conference on Hydraulics and Pneumatics
Hydraulic circuits - closed
5Energy recovery - Electric
Energy saving hydraulic drives of industrial machines
22nd International Conference on Hydraulics and Pneumatics
Hydraulic circuits - closed
Acceleration
6Energy recovery - Electric
Energy saving hydraulic drives of industrial machines
22nd International Conference on Hydraulics and Pneumatics
b) Hydraulic circuits - closed
Decceleration
7Electro-hydraulic drive wiring diagram
Energy saving hydraulic drives of industrial machines
22nd International Conference on Hydraulics and Pneumatics
1. Frequency convertor SKB34000752. Asynchronous induction motor 1,1kW 3. Hydraulic generator Parker PGM511
4. Hydraulic motor MRAK 65. Flywheel6. 7. Hydraulic valves
8. Boost pump9. PC – with measuring card10. Revolution, pressure sensors
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STANDHydraulic motor Parker PGM511
Asynchronous induction motor 1,1kW
Frequency convertor SKB3400075
Pressure valves
Boost pump
Flywheel
Hydraulic motor MRAK 6
Hydraulic parts ArgoHytos
PC – with measuring card
RPM and pressure sensors
Energy saving hydraulic drives of industrial machines
22nd International Conference on Hydraulics and Pneumatics
Braking resistor
II. Asynchronous induction motor 1,1kW
II. Flywheel
II. PC – with measuring card
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Energy flow of electro-hydraulic system in the second phase – flywheel deceleration
Energy saving hydraulic drives of industrial machines
22nd International Conference on Hydraulics and Pneumatics
Schema at SW - Dynast
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Energy saving hydraulic drives of industrial machines
22nd International Conference on Hydraulics and Pneumatics
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Energy saving hydraulic drives of industrial machines
22nd International Conference on Hydraulics and Pneumatics
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Energy saving hydraulic drives of industrial machines
22nd International Conference on Hydraulics and Pneumatics
Torq
ue [N
m]
Torq
ue [N
m]
Time [s] Time [s]
Torque of Hydromotor MRAK 6 Torque of Generator Parker PGM511
Braking torque measurement
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Scanning time Tvz=0.002;Starting time TR=0.8;Stabilization time TD=0.6;Braking time TB=0.8;No. of cycles N=5;Maximal RPM nmax=225;Minimal RPM nmin=60;
Specified parameters:
Energy saving hydraulic drives of industrial machines
22nd International Conference on Hydraulics and Pneumatics
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Energy saving hydraulic drives of industrial machines
22nd International Conference on Hydraulics and Pneumatics
Flywheel 1Diameter = 400 mmThickness = 120 mmn max = 210 RPMInertia = 2,17 kg.m2
Maximum kinetic energy = 600 J
Dick = 10 mm Diameter [ mm ] Number
Part 1 200 4 x
Part 2 150 2 x
Part 3 144 1 x
Part 4 125 1 x
Flywheel 2 - Power supply to other drive
STAND - adjustment
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Energy saving hydraulic drives of industrial machines
22nd International Conference on Hydraulics and Pneumatics
Graph 1
Graph 2
Flywheel 2
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The input values
Energy saving hydraulic drives of industrial machines
22nd International Conference on Hydraulics and Pneumatics
Speed control - Matlab
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Energy saving hydraulic drives of industrial machines
22nd International Conference on Hydraulics and Pneumatics
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Conclusion
Energy saving hydraulic drives of industrial machines
22nd International Conference on Hydraulics and Pneumatics
It was created stand for energy recovery - Pressure / electricimportant parametersPerformance - total power: 1000 W - 600 JoulesFlywheel 1 - moment of inertia and speed: 2.17 kg.m2, 210 RPMTorque - max braking time, maximum pressure on HM: 0.5 s, 80 bar
Recovery.Current max 2A at the time of 0.5 sThe longest recovery time of about 1s at current cca 1AShattered energy in the braking resistor - about 160 WEnergy utilization for the second drive: the size of the flywheel 2 diametr 144, speed 700RPM