Nadpis Jméno a Příjmení Datum CZECH TECHNICAL UNIVERSITY IN PRAGUE | FACULTY OF MECHANICAL ENGINEERING Department of Production Machines.

Nadpis

Jméno a Příjmení

Datum

www.rcmt.cvut.cz

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


3Braking large inertia

Mechanical energy

Throttling of hydraulic flow

Heat loss

Electric energy



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



Hydraulic circuits - closed




Hydraulic circuits - closed

Acceleration




b) Hydraulic circuits - closed

Decceleration

7Electro-hydraulic drive wiring diagram



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



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



Schema at SW - Dynast

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12



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:



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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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Graph 1

Graph 2

Flywheel 2

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The input values



Speed control - Matlab

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Conclusion



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

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Thank you for your attention



Nadpis Jméno a Příjmení Datum CZECH TECHNICAL UNIVERSITY IN PRAGUE | FACULTY OF MECHANICAL ENGINEERING Department of Production Machines.

Documents

hydraulic valves

pneumatics slide

nd international conference

lower hydraulic drive

pressure sensors energy

hydraulic parts argohytos

slide area

slide speed