Nadpis Jméno a Příjmení Datum CZECH TECHNICAL UNIVERSITY IN PRAGUE | FACULTY OF MECHANICAL ENGINEERING Department of Production Machines and Equipment | PME Research Center of Manufacturing Technology | RCMT Energy saving hydraulic drives for industrial machines Tomáš Krannich nd International Conference on Hydraulics and Pneumatics

2 Energy saving hydraulic drives of industrial machines ŽĎAS LVH 2500 Technical parameters: Rated deformation force ( tons ) : 2500 Number of strokes ( 1/min ) : 20 Rated power stroke (kgm ): Stroke ( mm ) : 500 Slide area ( mm x mm ) : 1050x1200 Gross Vehicle Weight (kg ) : The machine is equipped with a lower hydraulic drive. Spindle diameter = 500 mm, slide speed = 1 m / s 22 nd International Conference on Hydraulics and Pneumatics

3 Braking large inertia Mechanical energy Throttling of hydraulic flow Heat loss Electric energy Energy saving hydraulic drives of industrial machines 22 nd 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

4 Energy recovery - Electric Energy saving hydraulic drives of industrial machines 22 nd International Conference on Hydraulics and Pneumatics Hydraulic circuits - closed

5 Energy recovery - Electric Energy saving hydraulic drives of industrial machines 22 nd International Conference on Hydraulics and Pneumatics Hydraulic circuits - closed Acceleration

6 Energy recovery - Electric Energy saving hydraulic drives of industrial machines 22 nd International Conference on Hydraulics and Pneumatics b) Hydraulic circuits - closed Decceleration

7 Electro-hydraulic drive wiring diagram Energy saving hydraulic drives of industrial machines 22 nd International Conference on Hydraulics and Pneumatics 1. Frequency convertor SKB Asynchronous induction motor 1,1kW 3. Hydraulic generator Parker PGM Hydraulic motor MRAK 6 5. Flywheel Hydraulic valves 8. Boost pump 9. PC – with measuring card 10. Revolution, pressure sensors

8 STAND Hydraulic motor Parker PGM511 Asynchronous induction motor 1,1kW Frequency convertor SKB 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 22 nd International Conference on Hydraulics and Pneumatics Braking resistor II. Asynchronous induction motor 1,1kW II. Flywheel II. PC – with measuring card

9 Energy flow of electro-hydraulic system in the second phase – flywheel deceleration Energy saving hydraulic drives of industrial machines 22 nd International Conference on Hydraulics and Pneumatics Schema at SW - Dynast

10 Energy saving hydraulic drives of industrial machines 22 nd International Conference on Hydraulics and Pneumatics

11 Energy saving hydraulic drives of industrial machines 22 nd International Conference on Hydraulics and Pneumatics

12 Energy saving hydraulic drives of industrial machines 22 nd International Conference on Hydraulics and Pneumatics Torque [Nm] Time [s] Torque of Hydromotor MRAK 6 Torque of Generator Parker PGM511 Braking torque measurement

13 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 22 nd International Conference on Hydraulics and Pneumatics

14 Energy saving hydraulic drives of industrial machines 22 nd International Conference on Hydraulics and Pneumatics Flywheel 1 Diameter = 400 mm Thickness = 120 mm n max = 210 RPM Inertia = 2,17 kg.m 2 Maximum kinetic energy = 600 J Dick = 10 mmDiameter [ mm ]Number Part x Part x Part x Part x Flywheel 2 - Power supply to other drive STAND - adjustment

15 Energy saving hydraulic drives of industrial machines 22 nd International Conference on Hydraulics and Pneumatics Graph 1 Graph 2 Flywheel 2

16 The input values Energy saving hydraulic drives of industrial machines 22 nd International Conference on Hydraulics and Pneumatics Speed control - Matlab

17 Energy saving hydraulic drives of industrial machines 22 nd International Conference on Hydraulics and Pneumatics

18 Conclusion Energy saving hydraulic drives of industrial machines 22 nd International Conference on Hydraulics and Pneumatics It was created stand for energy recovery - Pressure / electric important parameters Performance - total power: 1000 W Joules Flywheel 1 - moment of inertia and speed: 2.17 kg.m2, 210 RPM Torque - max braking time, maximum  pressure on HM: 0.5 s, 80 bar Recovery. Current max 2A at the time of 0.5 s The longest recovery time of about 1s at current cca 1A Shattered energy in the braking resistor - about 160 W Energy utilization for the second drive: the size of the flywheel 2 diametr 144, speed 700RPM

19 Thank you for your attention Energy saving hydraulic drives of industrial machines 22 nd International Conference on Hydraulics and Pneumatics