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


PSHS

CSHS

CS

PSDDS


PSHS

CSHS

CS

PSDDS

Sample Preparation and Distribution System

CSHS


PSHSPSDDS

CS

CSHS


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)


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


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


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


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


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


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


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


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


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


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

Kayser-Threde GmbH Recent Progress in Designing the Sample ...

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