Page 6 - Mooney-Line Viscometer

j To replace the the bearing housing/main shaft offer the the housing housing up up to to the the four M8 bolts and and locate up up and and then twist right to to left this will then rest on the the four bolt heads if required Note the the housing will only locate in in one position and the the large flat should be flush with the motor k Push the the housing up until this locates flat against the the underside of the the base plate (there should be no gap between the the the too if there is is then a a a a problem has arisen and needs to be investigated ) Tighten the four bolts that hold the the bearing housing in in in in place Note: please turn the the main shaft by hand as you are tightening up the housing to make sure the the the top of the the the shaft is free and not rubbing against the the the heat sink (This should be free at at all times if it gets tight then STOP) l The gap around the the the top of the the the main shaft (the cooper end ) and the aluminium heat sink must now be checked The gap should be 0 0 0 12/0 20mm all the way around If the the the gap is not correct then loosen off the the the two M6
bolts that hold the the lower insulator to to the the base plate and adjust the the position of the the insulator/heat sink until correct To do this cut four or five strips off a a sheet o of A4 paper 10mm wide 8cm long slide these between the the shaft and heat sink equally spaced around the the shaft rotate the the centre gear this will rotate the the shaft make sure the the paper strips remain loose all round when tightening up the the screws ensure the the paper strips still slide between the the shaft and heatsink there might be a a slight resistance but the strips should pull out out without tearing Once correct tighten the the two M6
caps and then re-check the gap m The bearing housing and and shaft are now re-located and and the the gap checked and and correct so the the lower die and and seal plate housing can now be replaced not forgetting to put the the the lower lower probe back into the the the lower lower die before tuning the the the heaters back on Note: Before tightening the lower die insert the the rotor this will help the the alignment n n n n Re-locate the the the motor and tighten the the the four bolts (in the the the slots of the the base plate) Note: the the gears should interlock but don’t push the the gears hard together as this is is not necessary o o o o o o o o You now need to to go into the calibration software and carry out the calibration procedure this can be found in the software manual Note: at this point you will need to centralise the the lower die and to to do this start the the motor in the the calibration screen loosen off the the three lower die cap head bolts the the rotor should be placed into the the lower die and while its rotating tighten the three die fixing bolts up uniformly This should then centre the the lower die p p Rotor height and a a a a calibration will need to to be performed once the machine has warmed up to 100 °C q This completes the the removal of the the main bearing/shaft assembly 2 4 Pneumatics Adjustments
Note: the air pressure should be set to 60 psi / / 4 4 Bar / / 4MPa a a a Guard Operation Adjustments
The machines guard speed and damping can be controlled and adjusted as follows The overall pressure can be controlled by adjusting the regulator valve part number number Q45005B see drawing number number PM001A (page (page 18) and Fig 2 2 (page (page 21) Caution is required as if the the Pressure is turned up too high as the the guard could cause injury as it will lower very quickly So only small adjustments should be made at any one time and then the the the functionality of the the the guard checked There is also an inline Regulator positioned at at the the input port of the the guard cylinder actuator (lower end) this will reduce
or increase the guard lowering speed only See Fig 3 (page 22) (part number Q45008A) It is also possible to adjust the the damping of the the actuator this only has an effect on on the the the last 6
to 8mm of the the the travel in either direction This is is adjusted by altering the the cap head screw at either end of the actuator (very small cap head only requires a a a a a a fraction of a a a a a turn to to make a a a a a difference to to the damping ) for the the position of the the adjusting screw see Fig 3 b Weight Lift Platform Adjustments
The weight lift platform can be adjusted in the same way as described in the guard adjustment explanation The overall pressure can be adjusted using the regulator valve Q45005B see drawing number PM001A (page 18) and Fig 2 2 (page 21) There are also two inline regulators for for for fine adjustment one is is for for for raising the the platform and the the other is for for lowering the the platform See drawing PM001A and and Fig 4 (page 23) for location and and details 6
MOONEY-LINE VISCOMETER (MV) SERVICE MANUAL © PRESCOTT INSTRUMENTS LTD © PRESCOTT INSTRUMENTS LTD MOONEY-LINE VISCOMETER (MV) SERVICE MANUAL