kayser-threde gmbh recent progress in designing the sample
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Kayser-Threde GmbH Recent Progress in Designing the Sample Preparation and Distribution System of the ExoMars MissionKayser-Threde GmbH, Munich
W. Schulte, P. Hofmann, C. Widani, R. von Heise Rotenburg, T. Viscor
ASTRA 2008 Workshop, ESTEC
Space Technology & Applications
Science & Earth Observation
Process Control Systems
Automotive
Nov. 11, 20082 ExoMars SPDS – ASTRA Space Technology and Applications
SPDS & DrillElectronics
PSHS
CSHS
CS
PSDDS
SPDS & DrillElectronics
PSHS
CSHS
CS
PSDDS
SPDS & DrillElectronics
PSHS
CSHS
CS
PSDDS
Sample Preparation and Distribution System
CSHS
SPDS & DrillElectronics
PSHSPSDDS
CS
CSHS
SPDS & DrillElectronics
PSHSPSDDS
CS
SPDS flowchart
Drill sample probe
CSTM
ITMCS
PSDDS
PSHS
Instruments
Instruments
InstrumentsPart of SPDS
Not part of SPDS
• Core Sample Handling System (CSHS)
• Core Sample Transportation Mechanism (CSTM)
• Instrument Transportation Mechanism (ITM)
• Crushing Station (CS)
• Powdered Dosing and Distribution System (PSDDS)
• Powdered Sample HandlingSystem (PSHS)
Nov. 11, 20083 ExoMars SPDS – ASTRA Space Technology and Applications
Core Sample Transportation Mechanismhousing structure
launch locks
window for scanning
ALD door
gear rod
actuator and gear
Strengthening shaft
container
bellow
Spring mechanism and I/F structure
gear rod Harmonic drive gear and motor
gear transmition (ratio 1:1)
gear rod
shaft
springs
ALD doorI/F structure
containerI/F structure
travel range for scanning and sample handover to CS
a) b)ALD door
lip-seals
CSTM Main Functions
• Move sample to instrument viewing port (window)
• Precision movement of sample under instrumentsfor sample scanning
• Move sample to CS
Nov. 11, 20084 ExoMars SPDS – ASTRA Space Technology and Applications
Instrument Transportation Mechanism
actuator & gearhead
actuated spindle
slide with I/F structure
guidings instruments envelopes
ITM Main Functions
• Move optical instruments to viewing port
• Precision movement of optical instrumentsfor sample scanning
Nov. 11, 20085 ExoMars SPDS – ASTRA Space Technology and Applications
Crushing Station (Jaw Crusher)
inlet funnel
outlet funnel
fixed jaw
housing for moving jaw and de-jamming mechanism
actuator and gear boxmounting interfaces
eccentric
spline shaft
knee joint
bearing for de-jamming mechanismjaws
bellow
sealing
actuated bolt for de-jamming
arrester for de-jammingopen position
actuator gearhead
elliptical gear stage
gear reductiuon and transmission
drive shaft
CS Main Functions
• Crush core sample to fine powder
• Open crusher in case of jamming to let sample fall through uncrushed
Nov. 11, 20086 ExoMars SPDS – ASTRA Space Technology and Applications
Dosing Station Units
Positioner Cable Routing
Arm Structure
Powdered Sample Dosing and Distribution System
lifting spindle
guiding nut
guiding tube
slide block carriage(part of arm structure)
ball bearingsfriction bearing
lifting spindle gear
guiding tube gear
ball bearing
interface assembly
interface assembly
friction bearing
ultra clean zone
„dirty“ zone
bellows
motor and gearhead
outlet funnel / housing structure
inlet funnel
sealing
dosing wheel
bearings
cup springs
spacer bushings
covering
piezo- vibrator
couplingsealing
thread (fixation to arm structure)
connecting pipe
cover
„dirtyarea“
ultra clean zone
PSDDS Main Functions
• Move powdered sample to Urey instrument
• Dose specified amount of powdered sampleto Urey
• Move powdered sample to PSHS
• Dose specified amount of powdered sampleto PSHS
Nov. 11, 20087 ExoMars SPDS – ASTRA Space Technology and Applications
Powdered Sample Handling SystemPSHS Main Functions
• Move ovens to receive powder from PSDDS
• Move MOMA ovens into tapping station
• Move refillable container to receive powder from PSDDS
• Flatten sample surface in refillable container
• Move refillable container under instruments
• Empty refillable container
Nov. 11, 20088 ExoMars SPDS – ASTRA Space Technology and Applications
Crushing Station Breadboard Test Results
Position B
0,00%
20,00%
40,00%
60,00%
80,00%
100,00%
0 100 200 300 400 500
Grainsize [µm]
Cum
ulat
ive
Pow
der F
ract
ions
Marble
Porous Basalt
Massive Basalt
Sandstone
Cumulative powdered fraction with jaw gap setting at 300–400 micrometer
Tested Materials• Basalt
• Sandstone
• Salten Skov
• Wet/frozen Sandstone
• MarbleCore sample temperature during crushing
2 %2 %80 %1/4h1/4h1/4hSalten Skov(powder)
0.6 %-4 %1/4h-2hSandstone (wet/frozen)
0.7 %0.3 %0.3 %1/2h1/2h1hBasalt (massive)
Sticking MaterialTC VC TVC
Crushing TimeTC VC TVC
Material
Nov. 11, 20089 ExoMars SPDS – ASTRA Space Technology and Applications
Crushing Station Breadboard Test Results
Example of force/torque curve during crushing
Breadboard design influencing results• Stable crushing proven
• Cross contamination within acceptable limits
• Local temperature increase of core during crushing is negligible
• Needed operational torques and forces where found
• Crusher housing/structure is not stiff enough when made of aluminium
Nov. 11, 200810 ExoMars SPDS – ASTRA Space Technology and Applications
Dosing Station Breadboard Test Reults
Dosing Station Test Results Mass per 0.1 ml dosing step
Dosing Station cross contamination results
Dosed Sample Mass
00,020,040,060,08
0,10,120,140,160,18
1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37
Dosing Step
Mas
s [g
]
Example of Dosing Station repeatability
Tested Materials• Basalt
• Sandstone
• Salten Skov
• Marble
Nov. 11, 200811 ExoMars SPDS – ASTRA Space Technology and Applications
Example of motor current during dosing
Breadboard design influencing results• Good functionality under all environments
• Needed operational torques and forceswhere found
• Vibrators needed
• With vibrator cross contaminationnegligible
Dosing Station Breadboard Test Results
Nov. 11, 200812 ExoMars SPDS – ASTRA Space Technology and Applications
Summary
• Breadboards proved to provide valuable information
• CS breadboard showed problems to be solved in further design
• Further breadboard activity needed (currently breadboards of CSTM and PSDDS are being built)
• DS showed good functionality under all environments.
• Vibrators needed in DS